[edk2-devel] [edk2-redfish-client][PATCH 01/10] RedfishClientPkg: introduce Redfish HTTP cache library

[edk2-devel] [edk2-redfish-client][PATCH 01/10] RedfishClientPkg: introduce Redfish HTTP cache library

[Nickle Wang via groups.io]

Introduce RedfishHttpCacheLib to improve HTTP GET performance
in Redfish feature drivers. Feature drivers often query same
Redfish resource multiple times for different purpose. Add
HTTP cache mechanism to improve the performance.

Signed-off-by: Nickle Wang <nicklew@nvidia.com>
Cc: Abner Chang <abner.chang@amd.com>
Cc: Igor Kulchytskyy <igork@ami.com>
Cc: Nick Ramirez <nramirez@nvidia.com>
---
 RedfishClientPkg/RedfishClientPkg.dec         |   3 +-
 RedfishClientPkg/RedfishClientLibs.dsc.inc    |   3 +-
 RedfishClientPkg/RedfishClientPkg.dsc         |   3 +-
 .../RedfishHttpCacheLib.inf                   |  48 ++
 .../Include/Library/RedfishHttpCacheLib.h     |  59 ++
 .../RedfishHttpCacheLibInternal.h             |  63 ++
 .../RedfishHttpCacheLib/RedfishHttpCacheLib.c | 774 ++++++++++++++++++
 7 files changed, 950 insertions(+), 3 deletions(-)
 create mode 100644 RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
 create mode 100644 RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
 create mode 100644 RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInternal.h
 create mode 100644 RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c

diff --git a/RedfishClientPkg/RedfishClientPkg.dec b/RedfishClientPkg/RedfishClientPkg.dec
index 5f8a0350..b350faca 100644
--- a/RedfishClientPkg/RedfishClientPkg.dec
+++ b/RedfishClientPkg/RedfishClientPkg.dec
@@ -2,7 +2,7 @@
 # Redfish Client Package
 #
 # (C) Copyright 2021-2022 Hewlett Packard Enterprise Development LP<BR>
-# Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# Copyright (c) 2022-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
@@ -26,6 +26,7 @@
   EdkIIRedfishResourceConfigLib|Include/Library/EdkIIRedfishResourceConfigLib.h
   RedfishEventLib|Include/Library/RedfishEventLib.h
   RedfishVersionLib|Include/Library/RedfishVersionLib.h
+  RedfishHttpCacheLib|Include/Library/RedfishHttpCacheLib.h
 
 [LibraryClasses.Common.Private]
   ##  @libraryclass Redfish Helper Library
diff --git a/RedfishClientPkg/RedfishClientLibs.dsc.inc b/RedfishClientPkg/RedfishClientLibs.dsc.inc
index 5eae6711..572f426e 100644
--- a/RedfishClientPkg/RedfishClientLibs.dsc.inc
+++ b/RedfishClientPkg/RedfishClientLibs.dsc.inc
@@ -6,7 +6,7 @@
 # of EDKII network library classes.
 #
 # (C) Copyright 2021-2022 Hewlett Packard Enterprise Development LP<BR>
-# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -40,3 +40,4 @@
   RedfishVersionLib|RedfishClientPkg/Library/RedfishVersionLib/RedfishVersionLib.inf
   RedfishAddendumLib|RedfishClientPkg/Library/RedfishAddendumLib/RedfishAddendumLib.inf
   RedfishDebugLib|RedfishPkg/Library/RedfishDebugLib/RedfishDebugLib.inf
+  RedfishHttpCacheLib|RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
diff --git a/RedfishClientPkg/RedfishClientPkg.dsc b/RedfishClientPkg/RedfishClientPkg.dsc
index e16c91b8..0e3ef1ac 100644
--- a/RedfishClientPkg/RedfishClientPkg.dsc
+++ b/RedfishClientPkg/RedfishClientPkg.dsc
@@ -2,7 +2,7 @@
 # Redfish Client Package
 #
 # (C) Copyright 2021 Hewlett-Packard Enterprise Development LP.
-# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 #    SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -61,5 +61,6 @@
   RedfishClientPkg/Library/RedfishFeatureUtilityLib/RedfishFeatureUtilityLib.inf
   RedfishClientPkg/PrivateLibrary/RedfishLib/RedfishLib.inf
   RedfishClientPkg/Library/RedfishAddendumLib/RedfishAddendumLib.inf
+  RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
 
   !include RedfishClientPkg/RedfishClient.dsc.inc
diff --git a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
new file mode 100644
index 00000000..32da4f83
--- /dev/null
+++ b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
@@ -0,0 +1,48 @@
+## @file
+#  Redfish HTTP cache library helps Redfish application to get Redfish resource
+#  from BMC with cache mechanism enabled.
+#
+#  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010006
+  BASE_NAME                      = RedfishHttpCacheLib
+  FILE_GUID                      = 21F8FEEC-023C-451D-824D-823058FD9481
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = RedfishHttpCacheLib| DXE_DRIVER UEFI_DRIVER
+  CONSTRUCTOR                    = RedfishHttpCacheConstructor
+  DESTRUCTOR                     = RedfishHttpCacheDestructor
+
+#
+#  VALID_ARCHITECTURES           = IA32 X64 EBC
+#
+
+[Sources]
+  RedfishHttpCacheLibInternal.h
+  RedfishHttpCacheLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  RedfishPkg/RedfishPkg.dec
+  RedfishClientPkg/RedfishClientPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  UefiBootServicesTableLib
+  MemoryAllocationLib
+  RedfishLib
+  UefiLib
+  RedfishDebugLib
+  ReportStatusCodeLib
+  PrintLib
+
+[depex]
+  TRUE
+
diff --git a/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h b/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
new file mode 100644
index 00000000..1277b981
--- /dev/null
+++ b/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
@@ -0,0 +1,59 @@
+/** @file
+  This file defines the Redfish HTTP cache library interface.
+
+  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef REDFISH_HTTP_CACHE_LIB_H_
+#define REDFISH_HTTP_CACHE_LIB_H_
+
+#include <Uefi.h>
+#include <Library/RedfishLib.h>
+
+/**
+  Get redfish resource from given resource URI with cache mechanism
+  supported. It's caller's responsibility to Response by calling
+  RedfishFreeResponse ().
+
+  @param[in]  Service       Redfish service instance to make query.
+  @param[in]  Uri           Target resource URI.
+  @param[out] Response      HTTP response from redfish service.
+  @param[in]  UseCache      If it is TRUE, this function will search for
+                            cache first. If it is FALSE, this function
+                            will query Redfish URI directly.
+
+  @retval     EFI_SUCCESS     Resrouce is returned successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+RedfishHttpGetResource (
+  IN  REDFISH_SERVICE   Service,
+  IN  EFI_STRING        Uri,
+  OUT REDFISH_RESPONSE  *Response,
+  IN  BOOLEAN           UseCache
+  );
+
+/**
+  Reset the cached data specified by given URI. When response data
+  returned by RedfishHttpResetResource() is modified, the response
+  data can not be used by other caller. Application calls this
+  function to make this data to be stale data and
+  RedfishHttpResetResource() will get latest data from remote server
+  again.
+
+  @param[in]  Uri           Target resource URI.
+
+  @retval     EFI_SUCCESS     Resrouce is reset successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+RedfishHttpResetResource (
+  IN  EFI_STRING  Uri
+  );
+
+#endif
diff --git a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInternal.h b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInternal.h
new file mode 100644
index 00000000..2549335d
--- /dev/null
+++ b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInternal.h
@@ -0,0 +1,63 @@
+/** @file
+  This file defines the Redfish HTTP cache library internal headers.
+
+  Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef REDFISH_HTTP_CACHE_INTERNAL_LIB_H_
+#define REDFISH_HTTP_CACHE_INTERNAL_LIB_H_
+
+#include <Uefi.h>
+#include <RedfishBase.h>
+
+#include <Library/UefiLib.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/RedfishLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/RedfishHttpCacheLib.h>
+#include <Library/RedfishDebugLib.h>
+#include <Library/ReportStatusCodeLib.h>
+#include <Library/PrintLib.h>
+
+#define REDFISH_HTTP_CACHE_LIST_SIZE   0x0F
+#define REDFISH_HTTP_GET_RETRY_MAX     0x0F
+#define REDFISH_HTTP_RETRY_WAIT        (2 * 1000000U)  ///< 1 second
+#define REDFISH_ERROR_MSG_MAX          128
+#define REDFISH_HTTP_ERROR_REPORT      "Redfish HTTP failure(0x%x): %a"
+#define REDFISH_HTTP_CACHE_DEBUG       DEBUG_VERBOSE
+#define REDFISH_HTTP_CACHE_DEBUG_DUMP  DEBUG_VERBOSE
+
+///
+/// Definition of REDFISH_HTTP_CACHE_DATA
+///
+typedef struct {
+  LIST_ENTRY          List;
+  EFI_STRING          Uri;
+  UINTN               HitCount;
+  REDFISH_RESPONSE    *Response;
+} REDFISH_HTTP_CACHE_DATA;
+
+#define REDFISH_HTTP_CACHE_FROM_LIST(a)  BASE_CR (a, REDFISH_HTTP_CACHE_DATA, List)
+
+///
+/// Definition of REDFISH_HTTP_CACHE_LIST
+///
+typedef struct {
+  LIST_ENTRY    Head;
+  UINTN         Count;
+  UINTN         Capacity;
+} REDFISH_HTTP_CACHE_LIST;
+
+///
+/// Definition of REDFISH_HTTP_CACHE_PRIVATE
+///
+typedef struct {
+  REDFISH_HTTP_CACHE_LIST    CacheList;
+} REDFISH_HTTP_CACHE_PRIVATE;
+
+#endif
diff --git a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
new file mode 100644
index 00000000..c751e608
--- /dev/null
+++ b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
@@ -0,0 +1,774 @@
+/** @file
+  Redfish HTTP cache library helps Redfish application to get Redfish resource
+  from BMC with cache mechanism enabled.
+
+  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "RedfishHttpCacheLibInternal.h"
+
+REDFISH_HTTP_CACHE_PRIVATE  *mRedfishHttpCachePrivate = NULL;
+
+/**
+  This function copy the data in SrcResponse to DstResponse.
+
+  @param[in]  SrcResponse      Source Response to copy.
+  @param[out] DstResponse      Destination Response.
+
+  @retval     EFI_SUCCESS      Response is copied successfully.
+  @retval     Others           Error occurs.
+
+**/
+EFI_STATUS
+CopyRedfishResponse (
+  IN  REDFISH_RESPONSE  *SrcResponse,
+  OUT REDFISH_RESPONSE  *DstResponse
+  )
+{
+  EDKII_JSON_VALUE  JsonValue;
+  REDFISH_SERVICE   Service;
+  UINTN             Index;
+
+  if ((SrcResponse == NULL) || (DstResponse == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (SrcResponse == DstResponse) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // Status code
+  //
+  if (SrcResponse->StatusCode != NULL) {
+    DstResponse->StatusCode = AllocateCopyPool (sizeof (EFI_HTTP_STATUS_CODE), SrcResponse->StatusCode);
+    if (DstResponse->StatusCode == NULL) {
+      goto ON_ERROR;
+    }
+  }
+
+  //
+  // Header
+  //
+  if ((SrcResponse->HeaderCount > 0) && (SrcResponse->Headers != NULL)) {
+    DstResponse->HeaderCount = 0;
+    DstResponse->Headers     = AllocateZeroPool (sizeof (EFI_HTTP_HEADER) * SrcResponse->HeaderCount);
+    if (DstResponse->Headers == NULL) {
+      goto ON_ERROR;
+    }
+
+    for (Index = 0; Index < SrcResponse->HeaderCount; Index++) {
+      DstResponse->Headers[Index].FieldName = AllocateCopyPool (AsciiStrSize (SrcResponse->Headers[Index].FieldName), SrcResponse->Headers[Index].FieldName);
+      if (DstResponse->Headers[Index].FieldName == NULL) {
+        goto ON_ERROR;
+      }
+
+      DstResponse->Headers[Index].FieldValue = AllocateCopyPool (AsciiStrSize (SrcResponse->Headers[Index].FieldValue), SrcResponse->Headers[Index].FieldValue);
+      if (DstResponse->Headers[Index].FieldValue == NULL) {
+        goto ON_ERROR;
+      }
+
+      DstResponse->HeaderCount += 1;
+    }
+  }
+
+  //
+  // Payload
+  //
+  if (SrcResponse->Payload != NULL) {
+    Service              = RedfishServiceInPayload (SrcResponse->Payload);
+    JsonValue            = RedfishJsonInPayload (SrcResponse->Payload);
+    DstResponse->Payload = RedfishCreatePayload (JsonValue, Service);
+    if (DstResponse->Payload  == NULL) {
+      goto ON_ERROR;
+    }
+  }
+
+  return EFI_SUCCESS;
+
+ON_ERROR:
+
+  RedfishFreeResponse (
+    DstResponse->StatusCode,
+    DstResponse->HeaderCount,
+    DstResponse->Headers,
+    DstResponse->Payload
+    );
+
+  return EFI_OUT_OF_RESOURCES;
+}
+
+/**
+  This function clone input response and return to caller
+
+  @param[in]  Response      Response to clone.
+
+  @retval     REDFISH_RESPONSE *  Response is cloned.
+  @retval     NULL                Errors occur.
+
+**/
+REDFISH_RESPONSE *
+CloneRedfishResponse (
+  IN REDFISH_RESPONSE  *Response
+  )
+{
+  EFI_STATUS        Status;
+  REDFISH_RESPONSE  *NewResponse;
+
+  if (Response == NULL) {
+    return NULL;
+  }
+
+  NewResponse = AllocateZeroPool (sizeof (REDFISH_RESPONSE));
+  if (NewResponse == NULL) {
+    return NULL;
+  }
+
+  Status = CopyRedfishResponse (Response, NewResponse);
+  if (EFI_ERROR (Status)) {
+    FreePool (NewResponse);
+    return NULL;
+  }
+
+  return NewResponse;
+}
+
+/**
+
+  Convert Unicode string to ASCII string. It's call responsibility to release returned buffer.
+
+  @param[in]  UnicodeStr      Unicode string to convert.
+
+  @retval     CHAR8 *         ASCII string returned.
+  @retval     NULL            Errors occur.
+
+**/
+CHAR8 *
+StringUnicodeToAscii (
+  IN EFI_STRING  UnicodeStr
+  )
+{
+  CHAR8       *AsciiStr;
+  UINTN       AsciiStrSize;
+  EFI_STATUS  Status;
+
+  if (IS_EMPTY_STRING (UnicodeStr)) {
+    return NULL;
+  }
+
+  AsciiStrSize = StrLen (UnicodeStr) + 1;
+  AsciiStr     = AllocatePool (AsciiStrSize);
+  if (AsciiStr == NULL) {
+    return NULL;
+  }
+
+  Status = UnicodeStrToAsciiStrS (UnicodeStr, AsciiStr, AsciiStrSize);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "UnicodeStrToAsciiStrS failed: %r\n", Status));
+    FreePool (AsciiStr);
+    return NULL;
+  }
+
+  return AsciiStr;
+}
+
+/**
+  Release REDFISH_HTTP_CACHE_DATA resource
+
+  @param[in]    Data    Pointer to REDFISH_HTTP_CACHE_DATA instance
+
+  @retval EFI_SUCCESS             REDFISH_HTTP_CACHE_DATA is released successfully.
+  @retval EFI_INVALID_PARAMETER   Data is NULL
+
+**/
+EFI_STATUS
+ReleaseHttpCacheData (
+  IN REDFISH_HTTP_CACHE_DATA  *Data
+  )
+{
+  if (Data == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (Data->Uri != NULL) {
+    FreePool (Data->Uri);
+  }
+
+  if (Data->Response != NULL) {
+    if (Data->Response->Payload != NULL) {
+      RedfishFreeResponse (
+        Data->Response->StatusCode,
+        Data->Response->HeaderCount,
+        Data->Response->Headers,
+        Data->Response->Payload
+        );
+      FreePool (Data->Response);
+    }
+  }
+
+  FreePool (Data);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Create new cache data.
+
+  @param[in]    Uri       The URI string matching to this cache data.
+  @param[in]    Response  HTTP response.
+
+  @retval REDFISH_HTTP_CACHE_DATA *   Pointer to newly created cache data.
+  @retval NULL                        No memory available.
+
+**/
+REDFISH_HTTP_CACHE_DATA *
+NewHttpCacheData (
+  IN  EFI_STRING        Uri,
+  IN  REDFISH_RESPONSE  *Response
+  )
+{
+  REDFISH_HTTP_CACHE_DATA  *NewData;
+  UINTN                    Size;
+
+  if (IS_EMPTY_STRING (Uri) || (Response == NULL)) {
+    return NULL;
+  }
+
+  NewData = AllocateZeroPool (sizeof (REDFISH_HTTP_CACHE_DATA));
+  if (NewData == NULL) {
+    return NULL;
+  }
+
+  Size         = StrSize (Uri);
+  NewData->Uri = AllocateCopyPool (Size, Uri);
+  if (NewData->Uri == NULL) {
+    goto ON_ERROR;
+  }
+
+  NewData->Response = Response;
+  NewData->HitCount = 1;
+
+  return NewData;
+
+ON_ERROR:
+
+  if (NewData != NULL) {
+    ReleaseHttpCacheData (NewData);
+  }
+
+  return NULL;
+}
+
+/**
+  Search on given ListHeader for given URI string.
+
+  @param[in]    ListHeader  Target list to search.
+  @param[in]    Uri         Target URI to search.
+
+  @retval REDFISH_HTTP_CACHE_DATA   Target cache data is found.
+  @retval NULL                      No cache data with given URI is found.
+
+**/
+REDFISH_HTTP_CACHE_DATA *
+FindHttpCacheData (
+  IN  LIST_ENTRY  *ListHeader,
+  IN  EFI_STRING  Uri
+  )
+{
+  LIST_ENTRY               *List;
+  REDFISH_HTTP_CACHE_DATA  *Data;
+
+  if (IS_EMPTY_STRING (Uri)) {
+    return NULL;
+  }
+
+  if (IsListEmpty (ListHeader)) {
+    return NULL;
+  }
+
+  Data = NULL;
+  List = GetFirstNode (ListHeader);
+  while (!IsNull (ListHeader, List)) {
+    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
+
+    if (StrCmp (Data->Uri, Uri) == 0) {
+      return Data;
+    }
+
+    List = GetNextNode (ListHeader, List);
+  }
+
+  return NULL;
+}
+
+/**
+  Search on given ListHeader and return cache data with minimum hit count.
+
+  @param[in]    ListHeader  Target list to search.
+
+  @retval REDFISH_HTTP_CACHE_DATA   Target cache data is returned.
+  @retval NULL                      No cache data is found.
+
+**/
+REDFISH_HTTP_CACHE_DATA *
+FindUnusedHttpCacheData (
+  IN  LIST_ENTRY  *ListHeader
+  )
+{
+  LIST_ENTRY               *List;
+  REDFISH_HTTP_CACHE_DATA  *Data;
+  REDFISH_HTTP_CACHE_DATA  *UnusedData;
+  UINTN                    HitCount;
+
+  if (IsListEmpty (ListHeader)) {
+    return NULL;
+  }
+
+  Data       = NULL;
+  UnusedData = NULL;
+  HitCount   = 0;
+
+  List       = GetFirstNode (ListHeader);
+  Data       = REDFISH_HTTP_CACHE_FROM_LIST (List);
+  UnusedData = Data;
+  HitCount   = Data->HitCount;
+  List       = GetNextNode (ListHeader, List);
+
+  while (!IsNull (ListHeader, List)) {
+    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
+
+    if (Data->HitCount < HitCount) {
+      HitCount   = Data->HitCount;
+      UnusedData = Data;
+    }
+
+    List = GetNextNode (ListHeader, List);
+  }
+
+  return UnusedData;
+}
+
+/**
+  Delete a cache data by given cache instance.
+
+  @param[in]    List    Target cache list to be removed.
+  @param[in]    Data    Pointer to the instance to be deleted.
+
+  @retval EFI_SUCCESS   Cache data is removed.
+  @retval Others        Fail to remove cache data.
+
+**/
+EFI_STATUS
+DeleteHttpCacheData (
+  IN  REDFISH_HTTP_CACHE_LIST  *List,
+  IN  REDFISH_HTTP_CACHE_DATA  *Data
+  )
+{
+  if ((List == NULL) || (Data == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: delete: %s\n", __func__, Data->Uri));
+
+  RemoveEntryList (&Data->List);
+  --List->Count;
+
+  return ReleaseHttpCacheData (Data);
+}
+
+/**
+  Add new cache by given URI and HTTP response to specify List.
+
+  @param[in]    List      Target cache list to add.
+  @param[in]    Uri       The URI string matching to this cache data.
+  @param[in]    Response  HTTP response.
+
+  @retval EFI_SUCCESS   Cache data is added.
+  @retval Others        Fail to add cache data.
+
+**/
+EFI_STATUS
+AddHttpCacheData (
+  IN  REDFISH_HTTP_CACHE_LIST  *List,
+  IN  EFI_STRING               Uri,
+  IN  REDFISH_RESPONSE         *Response
+  )
+{
+  REDFISH_HTTP_CACHE_DATA  *NewData;
+  REDFISH_HTTP_CACHE_DATA  *OldData;
+  REDFISH_HTTP_CACHE_DATA  *UnusedData;
+  REDFISH_RESPONSE         *NewResponse;
+
+  if ((List == NULL) || IS_EMPTY_STRING (Uri) || (Response == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // If same cache data exist, replace it with latest one.
+  //
+  OldData = FindHttpCacheData (&List->Head, Uri);
+  if (OldData != NULL) {
+    DeleteHttpCacheData (List, OldData);
+  }
+
+  //
+  // Check capacity
+  //
+  if (List->Count >= List->Capacity) {
+    DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: list is full and retire unused cache\n", __func__));
+    UnusedData = FindUnusedHttpCacheData (&List->Head);
+    if (UnusedData == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    DeleteHttpCacheData (List, UnusedData);
+  }
+
+  //
+  // Clone a local copy
+  //
+  NewResponse = CloneRedfishResponse (Response);
+  if (NewResponse == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  NewData = NewHttpCacheData (Uri, NewResponse);
+  if (NewData == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  InsertTailList (&List->Head, &NewData->List);
+  ++List->Count;
+
+  DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: cache(%d/%d) %s\n", __func__, List->Count, List->Capacity, NewData->Uri));
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Release all cache from list.
+
+  @param[in]    CacheList    The list to be released.
+
+  @retval EFI_SUCCESS             All cache data are released.
+  @retval EFI_INVALID_PARAMETER   CacheList is NULL.
+
+**/
+EFI_STATUS
+ReleaseCacheList (
+  IN  REDFISH_HTTP_CACHE_LIST  *CacheList
+  )
+{
+  LIST_ENTRY               *List;
+  LIST_ENTRY               *Next;
+  REDFISH_HTTP_CACHE_DATA  *Data;
+
+  if (CacheList == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (IsListEmpty (&CacheList->Head)) {
+    return EFI_SUCCESS;
+  }
+
+  Data = NULL;
+  Next = NULL;
+  List = GetFirstNode (&CacheList->Head);
+  while (!IsNull (&CacheList->Head, List)) {
+    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
+    Next = GetNextNode (&CacheList->Head, List);
+
+    DeleteHttpCacheData (CacheList, Data);
+
+    List = Next;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Debug output the cache list.
+
+  @param[in]    Msg            Debug message string.
+  @param[in]    ErrorLevel     Output error level.
+  @param[in]    CacheList      Target list to dump.
+
+  @retval EFI_SUCCESS             Debug dump finished.
+  @retval EFI_INVALID_PARAMETER   HttpCacheList is NULL.
+
+**/
+EFI_STATUS
+DumpHttpCacheList (
+  IN  CONST CHAR8              *Msg,
+  IN  UINTN                    ErrorLevel,
+  IN  REDFISH_HTTP_CACHE_LIST  *CacheList
+  )
+{
+  LIST_ENTRY               *List;
+  REDFISH_HTTP_CACHE_DATA  *Data;
+  UINTN                    Index;
+
+  if (CacheList == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (!IS_EMPTY_STRING (Msg)) {
+    DEBUG ((ErrorLevel, "%a\n", Msg));
+  }
+
+  if (IsListEmpty (&CacheList->Head)) {
+    DEBUG ((ErrorLevel, "list is empty\n"));
+    return EFI_NOT_FOUND;
+  }
+
+  DEBUG ((ErrorLevel, "list count: %d capacity: %d\n", CacheList->Count, CacheList->Capacity));
+  Data  = NULL;
+  Index = 0;
+  List  = GetFirstNode (&CacheList->Head);
+  while (!IsNull (&CacheList->Head, List)) {
+    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
+
+    DEBUG ((ErrorLevel, "%d) Uri: %s Hit: %d\n", ++Index, Data->Uri, Data->HitCount));
+
+    List = GetNextNode (&CacheList->Head, List);
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Get redfish resource from given resource URI with cache mechanism
+  supported. It's caller's responsibility to Response by calling
+  RedfishFreeResponse ().
+
+  @param[in]  Service       Redfish service instance to make query.
+  @param[in]  Uri           Target resource URI.
+  @param[out] Response      HTTP response from redfish service.
+  @param[in]  UseCache      If it is TRUE, this function will search for
+                            cache first. If it is FALSE, this function
+                            will query Redfish URI directly.
+
+  @retval     EFI_SUCCESS     Resrouce is returned successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+RedfishHttpGetResource (
+  IN  REDFISH_SERVICE   Service,
+  IN  EFI_STRING        Uri,
+  OUT REDFISH_RESPONSE  *Response,
+  IN  BOOLEAN           UseCache
+  )
+{
+  EFI_STATUS               Status;
+  CHAR8                    *AsciiUri;
+  REDFISH_HTTP_CACHE_DATA  *CacheData;
+  UINTN                    RetryCount;
+
+  if ((Service == NULL) || (Response == NULL) || IS_EMPTY_STRING (Uri)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (mRedfishHttpCachePrivate == NULL) {
+    return EFI_NOT_READY;
+  }
+
+  AsciiUri   = NULL;
+  CacheData  = NULL;
+  RetryCount = 0;
+
+  //
+  // Search for cache list.
+  //
+  if (UseCache) {
+    CacheData = FindHttpCacheData (&mRedfishHttpCachePrivate->CacheList.Head, Uri);
+    if (CacheData != NULL) {
+      DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: cache hit! %s\n", __func__, Uri));
+
+      //
+      // Copy cached response to caller's buffer.
+      //
+      Status               = CopyRedfishResponse (CacheData->Response, Response);
+      CacheData->HitCount += 1;
+      return Status;
+    }
+  }
+
+  AsciiUri = StringUnicodeToAscii (Uri);
+  if (AsciiUri == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  //
+  // Get resource from redfish service.
+  //
+  do {
+    RetryCount += 1;
+    Status      = RedfishGetByUri (
+                    Service,
+                    AsciiUri,
+                    Response
+                    );
+    if (!EFI_ERROR (Status) || (RetryCount >= REDFISH_HTTP_GET_RETRY_MAX)) {
+      break;
+    }
+
+    //
+    // Retry when BMC is not ready.
+    //
+    if ((Response->StatusCode != NULL)) {
+      DEBUG_CODE (
+        DumpRedfishResponse (NULL, DEBUG_ERROR, Response);
+        );
+
+      if (*Response->StatusCode != HTTP_STATUS_500_INTERNAL_SERVER_ERROR) {
+        break;
+      }
+
+      FreePool (Response->StatusCode);
+      Response->StatusCode = NULL;
+    }
+
+    DEBUG ((DEBUG_WARN, "%a: RedfishGetByUri failed, retry (%d/%d)\n", __func__, RetryCount, REDFISH_HTTP_GET_RETRY_MAX));
+    gBS->Stall (REDFISH_HTTP_RETRY_WAIT);
+  } while (TRUE);
+
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: get %a failed (%d/%d): %r\n", __func__, AsciiUri, RetryCount, REDFISH_HTTP_GET_RETRY_MAX, Status));
+    if (Response->Payload != NULL) {
+      RedfishFreeResponse (
+        NULL,
+        0,
+        NULL,
+        Response->Payload
+        );
+      Response->Payload = NULL;
+    }
+
+    goto ON_RELEASE;
+  }
+
+  //
+  // Keep response in cache list
+  //
+  Status = AddHttpCacheData (&mRedfishHttpCachePrivate->CacheList, Uri, Response);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: failed to cache %s: %r\n", __func__, Uri, Status));
+    goto ON_RELEASE;
+  }
+
+  DEBUG_CODE (
+    DumpHttpCacheList (__func__, REDFISH_HTTP_CACHE_DEBUG_DUMP, &mRedfishHttpCachePrivate->CacheList);
+    );
+
+ON_RELEASE:
+
+  if (AsciiUri != NULL) {
+    FreePool (AsciiUri);
+  }
+
+  return Status;
+}
+
+/**
+  Reset the cached data specified by given URI. When response data
+  returned by RedfishHttpResetResource() is modified, the response
+  data can not be used by other caller. Application calls this
+  function to make this data to be stale data and
+  RedfishHttpResetResource() will get latest data from remote server
+  again.
+
+  @param[in]  Uri           Target resource URI.
+
+  @retval     EFI_SUCCESS     Resrouce is reset successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+RedfishHttpResetResource (
+  IN  EFI_STRING  Uri
+  )
+{
+  REDFISH_HTTP_CACHE_DATA  *CacheData;
+
+  if (IS_EMPTY_STRING (Uri)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (mRedfishHttpCachePrivate == NULL) {
+    return EFI_NOT_READY;
+  }
+
+  CacheData = FindHttpCacheData (&mRedfishHttpCachePrivate->CacheList.Head, Uri);
+  if (CacheData == NULL) {
+    return EFI_NOT_FOUND;
+  }
+
+  DeleteHttpCacheData (&mRedfishHttpCachePrivate->CacheList, CacheData);
+
+  return EFI_SUCCESS;
+}
+
+/**
+
+  Initial HTTP cache library instance.
+
+  @param[in] ImageHandle     The image handle.
+  @param[in] SystemTable     The system table.
+
+  @retval  EFI_SUCCESS  Initial library successfully.
+  @retval  Other        Return error status.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishHttpCacheConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  mRedfishHttpCachePrivate = AllocateZeroPool (sizeof (REDFISH_HTTP_CACHE_PRIVATE));
+  if (mRedfishHttpCachePrivate == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  //
+  // Initial cache list
+  //
+  mRedfishHttpCachePrivate->CacheList.Capacity = REDFISH_HTTP_CACHE_LIST_SIZE;
+  mRedfishHttpCachePrivate->CacheList.Count    = 0x00;
+  InitializeListHead (&mRedfishHttpCachePrivate->CacheList.Head);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Release allocated resource.
+
+  @param[in] ImageHandle       Handle that identifies the image to be unloaded.
+  @param[in] SystemTable      The system table.
+
+  @retval EFI_SUCCESS      The image has been unloaded.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishHttpCacheDestructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  if (mRedfishHttpCachePrivate != NULL) {
+    if (!IsListEmpty (&mRedfishHttpCachePrivate->CacheList.Head)) {
+      ReleaseCacheList (&mRedfishHttpCachePrivate->CacheList);
+    }
+
+    FreePool (mRedfishHttpCachePrivate);
+    mRedfishHttpCachePrivate = NULL;
+  }
+
+  return EFI_SUCCESS;
+}
-- 
2.34.1



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Re: [edk2-devel] [edk2-redfish-client][PATCH 01/10] RedfishClientPkg: introduce Redfish HTTP cache library

[Chang, Abner via groups.io]

[AMD Official Use Only - General]

Hi Nickle,
I have no problem with this feature as we have been using this for a while. Per discussion off line,  HttpCacheLibrary would be replaced with protocol version later. I would just give my RB to this patch as this patch is sent for cleaning up the backlogs we are going to upstream.
But before we merging this patch, could you please replace all "BMC" term in these files with either Redfish service or service? Thanks.

Abner

> -----Original Message-----
> From: Nickle Wang <nicklew@nvidia.com>
> Sent: Wednesday, January 3, 2024 8:00 PM
> To: devel@edk2.groups.io
> Cc: Chang, Abner <Abner.Chang@amd.com>; Igor Kulchytskyy
> <igork@ami.com>; Nick Ramirez <nramirez@nvidia.com>
> Subject: [edk2-redfish-client][PATCH 01/10] RedfishClientPkg: introduce
> Redfish HTTP cache library
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> Introduce RedfishHttpCacheLib to improve HTTP GET performance
> in Redfish feature drivers. Feature drivers often query same
> Redfish resource multiple times for different purpose. Add
> HTTP cache mechanism to improve the performance.
>
> Signed-off-by: Nickle Wang <nicklew@nvidia.com>
> Cc: Abner Chang <abner.chang@amd.com>
> Cc: Igor Kulchytskyy <igork@ami.com>
> Cc: Nick Ramirez <nramirez@nvidia.com>
> ---
>  RedfishClientPkg/RedfishClientPkg.dec         |   3 +-
>  RedfishClientPkg/RedfishClientLibs.dsc.inc    |   3 +-
>  RedfishClientPkg/RedfishClientPkg.dsc         |   3 +-
>  .../RedfishHttpCacheLib.inf                   |  48 ++
>  .../Include/Library/RedfishHttpCacheLib.h     |  59 ++
>  .../RedfishHttpCacheLibInternal.h             |  63 ++
>  .../RedfishHttpCacheLib/RedfishHttpCacheLib.c | 774 ++++++++++++++++++
>  7 files changed, 950 insertions(+), 3 deletions(-)
>  create mode 100644
> RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
>  create mode 100644
> RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
>  create mode 100644
> RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInternal.h
>  create mode 100644
> RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
>
> diff --git a/RedfishClientPkg/RedfishClientPkg.dec
> b/RedfishClientPkg/RedfishClientPkg.dec
> index 5f8a0350..b350faca 100644
> --- a/RedfishClientPkg/RedfishClientPkg.dec
> +++ b/RedfishClientPkg/RedfishClientPkg.dec
> @@ -2,7 +2,7 @@
>  # Redfish Client Package
>  #
>  # (C) Copyright 2021-2022 Hewlett Packard Enterprise Development LP<BR>
> -# Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +# Copyright (c) 2022-2024, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
>  #
>  # SPDX-License-Identifier: BSD-2-Clause-Patent
>  ##
> @@ -26,6 +26,7 @@
>
> EdkIIRedfishResourceConfigLib|Include/Library/EdkIIRedfishResourceConfigLi
> b.h
>    RedfishEventLib|Include/Library/RedfishEventLib.h
>    RedfishVersionLib|Include/Library/RedfishVersionLib.h
> +  RedfishHttpCacheLib|Include/Library/RedfishHttpCacheLib.h
>
>  [LibraryClasses.Common.Private]
>    ##  @libraryclass Redfish Helper Library
> diff --git a/RedfishClientPkg/RedfishClientLibs.dsc.inc
> b/RedfishClientPkg/RedfishClientLibs.dsc.inc
> index 5eae6711..572f426e 100644
> --- a/RedfishClientPkg/RedfishClientLibs.dsc.inc
> +++ b/RedfishClientPkg/RedfishClientLibs.dsc.inc
> @@ -6,7 +6,7 @@
>  # of EDKII network library classes.
>  #
>  # (C) Copyright 2021-2022 Hewlett Packard Enterprise Development LP<BR>
> -# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +# Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
>  #
>  #    SPDX-License-Identifier: BSD-2-Clause-Patent
>  #
> @@ -40,3 +40,4 @@
>
> RedfishVersionLib|RedfishClientPkg/Library/RedfishVersionLib/RedfishVersio
> nLib.inf
>
> RedfishAddendumLib|RedfishClientPkg/Library/RedfishAddendumLib/Redfis
> hAddendumLib.inf
>    RedfishDebugLib|RedfishPkg/Library/RedfishDebugLib/RedfishDebugLib.inf
> +
> RedfishHttpCacheLib|RedfishClientPkg/Library/RedfishHttpCacheLib/Redfish
> HttpCacheLib.inf
> diff --git a/RedfishClientPkg/RedfishClientPkg.dsc
> b/RedfishClientPkg/RedfishClientPkg.dsc
> index e16c91b8..0e3ef1ac 100644
> --- a/RedfishClientPkg/RedfishClientPkg.dsc
> +++ b/RedfishClientPkg/RedfishClientPkg.dsc
> @@ -2,7 +2,7 @@
>  # Redfish Client Package
>  #
>  # (C) Copyright 2021 Hewlett-Packard Enterprise Development LP.
> -# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +# Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
>  #
>  #    SPDX-License-Identifier: BSD-2-Clause-Patent
>  #
> @@ -61,5 +61,6 @@
>
> RedfishClientPkg/Library/RedfishFeatureUtilityLib/RedfishFeatureUtilityLib.inf
>    RedfishClientPkg/PrivateLibrary/RedfishLib/RedfishLib.inf
>    RedfishClientPkg/Library/RedfishAddendumLib/RedfishAddendumLib.inf
> +  RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
>
>    !include RedfishClientPkg/RedfishClient.dsc.inc
> diff --git
> a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> new file mode 100644
> index 00000000..32da4f83
> --- /dev/null
> +++
> b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> @@ -0,0 +1,48 @@
> +## @file
> +#  Redfish HTTP cache library helps Redfish application to get Redfish
> resource
> +#  from BMC with cache mechanism enabled.
> +#
> +#  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +#
> +#  SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x00010006
> +  BASE_NAME                      = RedfishHttpCacheLib
> +  FILE_GUID                      = 21F8FEEC-023C-451D-824D-823058FD9481
> +  MODULE_TYPE                    = DXE_DRIVER
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = RedfishHttpCacheLib| DXE_DRIVER UEFI_DRIVER
> +  CONSTRUCTOR                    = RedfishHttpCacheConstructor
> +  DESTRUCTOR                     = RedfishHttpCacheDestructor
> +
> +#
> +#  VALID_ARCHITECTURES           = IA32 X64 EBC
> +#
> +
> +[Sources]
> +  RedfishHttpCacheLibInternal.h
> +  RedfishHttpCacheLib.c
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  MdeModulePkg/MdeModulePkg.dec
> +  RedfishPkg/RedfishPkg.dec
> +  RedfishClientPkg/RedfishClientPkg.dec
> +
> +[LibraryClasses]
> +  BaseLib
> +  DebugLib
> +  UefiBootServicesTableLib
> +  MemoryAllocationLib
> +  RedfishLib
> +  UefiLib
> +  RedfishDebugLib
> +  ReportStatusCodeLib
> +  PrintLib
> +
> +[depex]
> +  TRUE
> +
> diff --git a/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> b/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> new file mode 100644
> index 00000000..1277b981
> --- /dev/null
> +++ b/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> @@ -0,0 +1,59 @@
> +/** @file
> +  This file defines the Redfish HTTP cache library interface.
> +
> +  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +
> +  SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef REDFISH_HTTP_CACHE_LIB_H_
> +#define REDFISH_HTTP_CACHE_LIB_H_
> +
> +#include <Uefi.h>
> +#include <Library/RedfishLib.h>
> +
> +/**
> +  Get redfish resource from given resource URI with cache mechanism
> +  supported. It's caller's responsibility to Response by calling
> +  RedfishFreeResponse ().
> +
> +  @param[in]  Service       Redfish service instance to make query.
> +  @param[in]  Uri           Target resource URI.
> +  @param[out] Response      HTTP response from redfish service.
> +  @param[in]  UseCache      If it is TRUE, this function will search for
> +                            cache first. If it is FALSE, this function
> +                            will query Redfish URI directly.
> +
> +  @retval     EFI_SUCCESS     Resrouce is returned successfully.
> +  @retval     Others          Errors occur.
> +
> +**/
> +EFI_STATUS
> +RedfishHttpGetResource (
> +  IN  REDFISH_SERVICE   Service,
> +  IN  EFI_STRING        Uri,
> +  OUT REDFISH_RESPONSE  *Response,
> +  IN  BOOLEAN           UseCache
> +  );
> +
> +/**
> +  Reset the cached data specified by given URI. When response data
> +  returned by RedfishHttpResetResource() is modified, the response
> +  data can not be used by other caller. Application calls this
> +  function to make this data to be stale data and
> +  RedfishHttpResetResource() will get latest data from remote server
> +  again.
> +
> +  @param[in]  Uri           Target resource URI.
> +
> +  @retval     EFI_SUCCESS     Resrouce is reset successfully.
> +  @retval     Others          Errors occur.
> +
> +**/
> +EFI_STATUS
> +RedfishHttpResetResource (
> +  IN  EFI_STRING  Uri
> +  );
> +
> +#endif
> diff --git
> a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInterna
> l.h
> b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInterna
> l.h
> new file mode 100644
> index 00000000..2549335d
> --- /dev/null
> +++
> b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInterna
> l.h
> @@ -0,0 +1,63 @@
> +/** @file
> +  This file defines the Redfish HTTP cache library internal headers.
> +
> +  Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +
> +  SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef REDFISH_HTTP_CACHE_INTERNAL_LIB_H_
> +#define REDFISH_HTTP_CACHE_INTERNAL_LIB_H_
> +
> +#include <Uefi.h>
> +#include <RedfishBase.h>
> +
> +#include <Library/UefiLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/RedfishLib.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +#include <Library/RedfishHttpCacheLib.h>
> +#include <Library/RedfishDebugLib.h>
> +#include <Library/ReportStatusCodeLib.h>
> +#include <Library/PrintLib.h>
> +
> +#define REDFISH_HTTP_CACHE_LIST_SIZE   0x0F
> +#define REDFISH_HTTP_GET_RETRY_MAX     0x0F
> +#define REDFISH_HTTP_RETRY_WAIT        (2 * 1000000U)  ///< 1 second
> +#define REDFISH_ERROR_MSG_MAX          128
> +#define REDFISH_HTTP_ERROR_REPORT      "Redfish HTTP failure(0x%x): %a"
> +#define REDFISH_HTTP_CACHE_DEBUG       DEBUG_VERBOSE
> +#define REDFISH_HTTP_CACHE_DEBUG_DUMP  DEBUG_VERBOSE
> +
> +///
> +/// Definition of REDFISH_HTTP_CACHE_DATA
> +///
> +typedef struct {
> +  LIST_ENTRY          List;
> +  EFI_STRING          Uri;
> +  UINTN               HitCount;
> +  REDFISH_RESPONSE    *Response;
> +} REDFISH_HTTP_CACHE_DATA;
> +
> +#define REDFISH_HTTP_CACHE_FROM_LIST(a)  BASE_CR (a,
> REDFISH_HTTP_CACHE_DATA, List)
> +
> +///
> +/// Definition of REDFISH_HTTP_CACHE_LIST
> +///
> +typedef struct {
> +  LIST_ENTRY    Head;
> +  UINTN         Count;
> +  UINTN         Capacity;
> +} REDFISH_HTTP_CACHE_LIST;
> +
> +///
> +/// Definition of REDFISH_HTTP_CACHE_PRIVATE
> +///
> +typedef struct {
> +  REDFISH_HTTP_CACHE_LIST    CacheList;
> +} REDFISH_HTTP_CACHE_PRIVATE;
> +
> +#endif
> diff --git
> a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
> b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
> new file mode 100644
> index 00000000..c751e608
> --- /dev/null
> +++ b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
> @@ -0,0 +1,774 @@
> +/** @file
> +  Redfish HTTP cache library helps Redfish application to get Redfish resource
> +  from BMC with cache mechanism enabled.
> +
> +  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved.
> +
> +  SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include "RedfishHttpCacheLibInternal.h"
> +
> +REDFISH_HTTP_CACHE_PRIVATE  *mRedfishHttpCachePrivate = NULL;
> +
> +/**
> +  This function copy the data in SrcResponse to DstResponse.
> +
> +  @param[in]  SrcResponse      Source Response to copy.
> +  @param[out] DstResponse      Destination Response.
> +
> +  @retval     EFI_SUCCESS      Response is copied successfully.
> +  @retval     Others           Error occurs.
> +
> +**/
> +EFI_STATUS
> +CopyRedfishResponse (
> +  IN  REDFISH_RESPONSE  *SrcResponse,
> +  OUT REDFISH_RESPONSE  *DstResponse
> +  )
> +{
> +  EDKII_JSON_VALUE  JsonValue;
> +  REDFISH_SERVICE   Service;
> +  UINTN             Index;
> +
> +  if ((SrcResponse == NULL) || (DstResponse == NULL)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  if (SrcResponse == DstResponse) {
> +    return EFI_SUCCESS;
> +  }
> +
> +  //
> +  // Status code
> +  //
> +  if (SrcResponse->StatusCode != NULL) {
> +    DstResponse->StatusCode = AllocateCopyPool (sizeof
> (EFI_HTTP_STATUS_CODE), SrcResponse->StatusCode);
> +    if (DstResponse->StatusCode == NULL) {
> +      goto ON_ERROR;
> +    }
> +  }
> +
> +  //
> +  // Header
> +  //
> +  if ((SrcResponse->HeaderCount > 0) && (SrcResponse->Headers != NULL)) {
> +    DstResponse->HeaderCount = 0;
> +    DstResponse->Headers     = AllocateZeroPool (sizeof (EFI_HTTP_HEADER) *
> SrcResponse->HeaderCount);
> +    if (DstResponse->Headers == NULL) {
> +      goto ON_ERROR;
> +    }
> +
> +    for (Index = 0; Index < SrcResponse->HeaderCount; Index++) {
> +      DstResponse->Headers[Index].FieldName = AllocateCopyPool (AsciiStrSize
> (SrcResponse->Headers[Index].FieldName), SrcResponse-
> >Headers[Index].FieldName);
> +      if (DstResponse->Headers[Index].FieldName == NULL) {
> +        goto ON_ERROR;
> +      }
> +
> +      DstResponse->Headers[Index].FieldValue = AllocateCopyPool (AsciiStrSize
> (SrcResponse->Headers[Index].FieldValue), SrcResponse-
> >Headers[Index].FieldValue);
> +      if (DstResponse->Headers[Index].FieldValue == NULL) {
> +        goto ON_ERROR;
> +      }
> +
> +      DstResponse->HeaderCount += 1;
> +    }
> +  }
> +
> +  //
> +  // Payload
> +  //
> +  if (SrcResponse->Payload != NULL) {
> +    Service              = RedfishServiceInPayload (SrcResponse->Payload);
> +    JsonValue            = RedfishJsonInPayload (SrcResponse->Payload);
> +    DstResponse->Payload = RedfishCreatePayload (JsonValue, Service);
> +    if (DstResponse->Payload  == NULL) {
> +      goto ON_ERROR;
> +    }
> +  }
> +
> +  return EFI_SUCCESS;
> +
> +ON_ERROR:
> +
> +  RedfishFreeResponse (
> +    DstResponse->StatusCode,
> +    DstResponse->HeaderCount,
> +    DstResponse->Headers,
> +    DstResponse->Payload
> +    );
> +
> +  return EFI_OUT_OF_RESOURCES;
> +}
> +
> +/**
> +  This function clone input response and return to caller
> +
> +  @param[in]  Response      Response to clone.
> +
> +  @retval     REDFISH_RESPONSE *  Response is cloned.
> +  @retval     NULL                Errors occur.
> +
> +**/
> +REDFISH_RESPONSE *
> +CloneRedfishResponse (
> +  IN REDFISH_RESPONSE  *Response
> +  )
> +{
> +  EFI_STATUS        Status;
> +  REDFISH_RESPONSE  *NewResponse;
> +
> +  if (Response == NULL) {
> +    return NULL;
> +  }
> +
> +  NewResponse = AllocateZeroPool (sizeof (REDFISH_RESPONSE));
> +  if (NewResponse == NULL) {
> +    return NULL;
> +  }
> +
> +  Status = CopyRedfishResponse (Response, NewResponse);
> +  if (EFI_ERROR (Status)) {
> +    FreePool (NewResponse);
> +    return NULL;
> +  }
> +
> +  return NewResponse;
> +}
> +
> +/**
> +
> +  Convert Unicode string to ASCII string. It's call responsibility to release
> returned buffer.
> +
> +  @param[in]  UnicodeStr      Unicode string to convert.
> +
> +  @retval     CHAR8 *         ASCII string returned.
> +  @retval     NULL            Errors occur.
> +
> +**/
> +CHAR8 *
> +StringUnicodeToAscii (
> +  IN EFI_STRING  UnicodeStr
> +  )
> +{
> +  CHAR8       *AsciiStr;
> +  UINTN       AsciiStrSize;
> +  EFI_STATUS  Status;
> +
> +  if (IS_EMPTY_STRING (UnicodeStr)) {
> +    return NULL;
> +  }
> +
> +  AsciiStrSize = StrLen (UnicodeStr) + 1;
> +  AsciiStr     = AllocatePool (AsciiStrSize);
> +  if (AsciiStr == NULL) {
> +    return NULL;
> +  }
> +
> +  Status = UnicodeStrToAsciiStrS (UnicodeStr, AsciiStr, AsciiStrSize);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "UnicodeStrToAsciiStrS failed: %r\n", Status));
> +    FreePool (AsciiStr);
> +    return NULL;
> +  }
> +
> +  return AsciiStr;
> +}
> +
> +/**
> +  Release REDFISH_HTTP_CACHE_DATA resource
> +
> +  @param[in]    Data    Pointer to REDFISH_HTTP_CACHE_DATA instance
> +
> +  @retval EFI_SUCCESS             REDFISH_HTTP_CACHE_DATA is released
> successfully.
> +  @retval EFI_INVALID_PARAMETER   Data is NULL
> +
> +**/
> +EFI_STATUS
> +ReleaseHttpCacheData (
> +  IN REDFISH_HTTP_CACHE_DATA  *Data
> +  )
> +{
> +  if (Data == NULL) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  if (Data->Uri != NULL) {
> +    FreePool (Data->Uri);
> +  }
> +
> +  if (Data->Response != NULL) {
> +    if (Data->Response->Payload != NULL) {
> +      RedfishFreeResponse (
> +        Data->Response->StatusCode,
> +        Data->Response->HeaderCount,
> +        Data->Response->Headers,
> +        Data->Response->Payload
> +        );
> +      FreePool (Data->Response);
> +    }
> +  }
> +
> +  FreePool (Data);
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Create new cache data.
> +
> +  @param[in]    Uri       The URI string matching to this cache data.
> +  @param[in]    Response  HTTP response.
> +
> +  @retval REDFISH_HTTP_CACHE_DATA *   Pointer to newly created cache
> data.
> +  @retval NULL                        No memory available.
> +
> +**/
> +REDFISH_HTTP_CACHE_DATA *
> +NewHttpCacheData (
> +  IN  EFI_STRING        Uri,
> +  IN  REDFISH_RESPONSE  *Response
> +  )
> +{
> +  REDFISH_HTTP_CACHE_DATA  *NewData;
> +  UINTN                    Size;
> +
> +  if (IS_EMPTY_STRING (Uri) || (Response == NULL)) {
> +    return NULL;
> +  }
> +
> +  NewData = AllocateZeroPool (sizeof (REDFISH_HTTP_CACHE_DATA));
> +  if (NewData == NULL) {
> +    return NULL;
> +  }
> +
> +  Size         = StrSize (Uri);
> +  NewData->Uri = AllocateCopyPool (Size, Uri);
> +  if (NewData->Uri == NULL) {
> +    goto ON_ERROR;
> +  }
> +
> +  NewData->Response = Response;
> +  NewData->HitCount = 1;
> +
> +  return NewData;
> +
> +ON_ERROR:
> +
> +  if (NewData != NULL) {
> +    ReleaseHttpCacheData (NewData);
> +  }
> +
> +  return NULL;
> +}
> +
> +/**
> +  Search on given ListHeader for given URI string.
> +
> +  @param[in]    ListHeader  Target list to search.
> +  @param[in]    Uri         Target URI to search.
> +
> +  @retval REDFISH_HTTP_CACHE_DATA   Target cache data is found.
> +  @retval NULL                      No cache data with given URI is found.
> +
> +**/
> +REDFISH_HTTP_CACHE_DATA *
> +FindHttpCacheData (
> +  IN  LIST_ENTRY  *ListHeader,
> +  IN  EFI_STRING  Uri
> +  )
> +{
> +  LIST_ENTRY               *List;
> +  REDFISH_HTTP_CACHE_DATA  *Data;
> +
> +  if (IS_EMPTY_STRING (Uri)) {
> +    return NULL;
> +  }
> +
> +  if (IsListEmpty (ListHeader)) {
> +    return NULL;
> +  }
> +
> +  Data = NULL;
> +  List = GetFirstNode (ListHeader);
> +  while (!IsNull (ListHeader, List)) {
> +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> +
> +    if (StrCmp (Data->Uri, Uri) == 0) {
> +      return Data;
> +    }
> +
> +    List = GetNextNode (ListHeader, List);
> +  }
> +
> +  return NULL;
> +}
> +
> +/**
> +  Search on given ListHeader and return cache data with minimum hit count.
> +
> +  @param[in]    ListHeader  Target list to search.
> +
> +  @retval REDFISH_HTTP_CACHE_DATA   Target cache data is returned.
> +  @retval NULL                      No cache data is found.
> +
> +**/
> +REDFISH_HTTP_CACHE_DATA *
> +FindUnusedHttpCacheData (
> +  IN  LIST_ENTRY  *ListHeader
> +  )
> +{
> +  LIST_ENTRY               *List;
> +  REDFISH_HTTP_CACHE_DATA  *Data;
> +  REDFISH_HTTP_CACHE_DATA  *UnusedData;
> +  UINTN                    HitCount;
> +
> +  if (IsListEmpty (ListHeader)) {
> +    return NULL;
> +  }
> +
> +  Data       = NULL;
> +  UnusedData = NULL;
> +  HitCount   = 0;
> +
> +  List       = GetFirstNode (ListHeader);
> +  Data       = REDFISH_HTTP_CACHE_FROM_LIST (List);
> +  UnusedData = Data;
> +  HitCount   = Data->HitCount;
> +  List       = GetNextNode (ListHeader, List);
> +
> +  while (!IsNull (ListHeader, List)) {
> +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> +
> +    if (Data->HitCount < HitCount) {
> +      HitCount   = Data->HitCount;
> +      UnusedData = Data;
> +    }
> +
> +    List = GetNextNode (ListHeader, List);
> +  }
> +
> +  return UnusedData;
> +}
> +
> +/**
> +  Delete a cache data by given cache instance.
> +
> +  @param[in]    List    Target cache list to be removed.
> +  @param[in]    Data    Pointer to the instance to be deleted.
> +
> +  @retval EFI_SUCCESS   Cache data is removed.
> +  @retval Others        Fail to remove cache data.
> +
> +**/
> +EFI_STATUS
> +DeleteHttpCacheData (
> +  IN  REDFISH_HTTP_CACHE_LIST  *List,
> +  IN  REDFISH_HTTP_CACHE_DATA  *Data
> +  )
> +{
> +  if ((List == NULL) || (Data == NULL)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: delete: %s\n", __func__,
> Data->Uri));
> +
> +  RemoveEntryList (&Data->List);
> +  --List->Count;
> +
> +  return ReleaseHttpCacheData (Data);
> +}
> +
> +/**
> +  Add new cache by given URI and HTTP response to specify List.
> +
> +  @param[in]    List      Target cache list to add.
> +  @param[in]    Uri       The URI string matching to this cache data.
> +  @param[in]    Response  HTTP response.
> +
> +  @retval EFI_SUCCESS   Cache data is added.
> +  @retval Others        Fail to add cache data.
> +
> +**/
> +EFI_STATUS
> +AddHttpCacheData (
> +  IN  REDFISH_HTTP_CACHE_LIST  *List,
> +  IN  EFI_STRING               Uri,
> +  IN  REDFISH_RESPONSE         *Response
> +  )
> +{
> +  REDFISH_HTTP_CACHE_DATA  *NewData;
> +  REDFISH_HTTP_CACHE_DATA  *OldData;
> +  REDFISH_HTTP_CACHE_DATA  *UnusedData;
> +  REDFISH_RESPONSE         *NewResponse;
> +
> +  if ((List == NULL) || IS_EMPTY_STRING (Uri) || (Response == NULL)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  //
> +  // If same cache data exist, replace it with latest one.
> +  //
> +  OldData = FindHttpCacheData (&List->Head, Uri);
> +  if (OldData != NULL) {
> +    DeleteHttpCacheData (List, OldData);
> +  }
> +
> +  //
> +  // Check capacity
> +  //
> +  if (List->Count >= List->Capacity) {
> +    DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: list is full and retire unused
> cache\n", __func__));
> +    UnusedData = FindUnusedHttpCacheData (&List->Head);
> +    if (UnusedData == NULL) {
> +      return EFI_OUT_OF_RESOURCES;
> +    }
> +
> +    DeleteHttpCacheData (List, UnusedData);
> +  }
> +
> +  //
> +  // Clone a local copy
> +  //
> +  NewResponse = CloneRedfishResponse (Response);
> +  if (NewResponse == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  NewData = NewHttpCacheData (Uri, NewResponse);
> +  if (NewData == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  InsertTailList (&List->Head, &NewData->List);
> +  ++List->Count;
> +
> +  DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: cache(%d/%d) %s\n",
> __func__, List->Count, List->Capacity, NewData->Uri));
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Release all cache from list.
> +
> +  @param[in]    CacheList    The list to be released.
> +
> +  @retval EFI_SUCCESS             All cache data are released.
> +  @retval EFI_INVALID_PARAMETER   CacheList is NULL.
> +
> +**/
> +EFI_STATUS
> +ReleaseCacheList (
> +  IN  REDFISH_HTTP_CACHE_LIST  *CacheList
> +  )
> +{
> +  LIST_ENTRY               *List;
> +  LIST_ENTRY               *Next;
> +  REDFISH_HTTP_CACHE_DATA  *Data;
> +
> +  if (CacheList == NULL) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  if (IsListEmpty (&CacheList->Head)) {
> +    return EFI_SUCCESS;
> +  }
> +
> +  Data = NULL;
> +  Next = NULL;
> +  List = GetFirstNode (&CacheList->Head);
> +  while (!IsNull (&CacheList->Head, List)) {
> +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> +    Next = GetNextNode (&CacheList->Head, List);
> +
> +    DeleteHttpCacheData (CacheList, Data);
> +
> +    List = Next;
> +  }
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Debug output the cache list.
> +
> +  @param[in]    Msg            Debug message string.
> +  @param[in]    ErrorLevel     Output error level.
> +  @param[in]    CacheList      Target list to dump.
> +
> +  @retval EFI_SUCCESS             Debug dump finished.
> +  @retval EFI_INVALID_PARAMETER   HttpCacheList is NULL.
> +
> +**/
> +EFI_STATUS
> +DumpHttpCacheList (
> +  IN  CONST CHAR8              *Msg,
> +  IN  UINTN                    ErrorLevel,
> +  IN  REDFISH_HTTP_CACHE_LIST  *CacheList
> +  )
> +{
> +  LIST_ENTRY               *List;
> +  REDFISH_HTTP_CACHE_DATA  *Data;
> +  UINTN                    Index;
> +
> +  if (CacheList == NULL) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  if (!IS_EMPTY_STRING (Msg)) {
> +    DEBUG ((ErrorLevel, "%a\n", Msg));
> +  }
> +
> +  if (IsListEmpty (&CacheList->Head)) {
> +    DEBUG ((ErrorLevel, "list is empty\n"));
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  DEBUG ((ErrorLevel, "list count: %d capacity: %d\n", CacheList->Count,
> CacheList->Capacity));
> +  Data  = NULL;
> +  Index = 0;
> +  List  = GetFirstNode (&CacheList->Head);
> +  while (!IsNull (&CacheList->Head, List)) {
> +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> +
> +    DEBUG ((ErrorLevel, "%d) Uri: %s Hit: %d\n", ++Index, Data->Uri, Data-
> >HitCount));
> +
> +    List = GetNextNode (&CacheList->Head, List);
> +  }
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Get redfish resource from given resource URI with cache mechanism
> +  supported. It's caller's responsibility to Response by calling
> +  RedfishFreeResponse ().
> +
> +  @param[in]  Service       Redfish service instance to make query.
> +  @param[in]  Uri           Target resource URI.
> +  @param[out] Response      HTTP response from redfish service.
> +  @param[in]  UseCache      If it is TRUE, this function will search for
> +                            cache first. If it is FALSE, this function
> +                            will query Redfish URI directly.
> +
> +  @retval     EFI_SUCCESS     Resrouce is returned successfully.
> +  @retval     Others          Errors occur.
> +
> +**/
> +EFI_STATUS
> +RedfishHttpGetResource (
> +  IN  REDFISH_SERVICE   Service,
> +  IN  EFI_STRING        Uri,
> +  OUT REDFISH_RESPONSE  *Response,
> +  IN  BOOLEAN           UseCache
> +  )
> +{
> +  EFI_STATUS               Status;
> +  CHAR8                    *AsciiUri;
> +  REDFISH_HTTP_CACHE_DATA  *CacheData;
> +  UINTN                    RetryCount;
> +
> +  if ((Service == NULL) || (Response == NULL) || IS_EMPTY_STRING (Uri)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  if (mRedfishHttpCachePrivate == NULL) {
> +    return EFI_NOT_READY;
> +  }
> +
> +  AsciiUri   = NULL;
> +  CacheData  = NULL;
> +  RetryCount = 0;
> +
> +  //
> +  // Search for cache list.
> +  //
> +  if (UseCache) {
> +    CacheData = FindHttpCacheData (&mRedfishHttpCachePrivate-
> >CacheList.Head, Uri);
> +    if (CacheData != NULL) {
> +      DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: cache hit! %s\n",
> __func__, Uri));
> +
> +      //
> +      // Copy cached response to caller's buffer.
> +      //
> +      Status               = CopyRedfishResponse (CacheData->Response, Response);
> +      CacheData->HitCount += 1;
> +      return Status;
> +    }
> +  }
> +
> +  AsciiUri = StringUnicodeToAscii (Uri);
> +  if (AsciiUri == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  //
> +  // Get resource from redfish service.
> +  //
> +  do {
> +    RetryCount += 1;
> +    Status      = RedfishGetByUri (
> +                    Service,
> +                    AsciiUri,
> +                    Response
> +                    );
> +    if (!EFI_ERROR (Status) || (RetryCount >=
> REDFISH_HTTP_GET_RETRY_MAX)) {
> +      break;
> +    }
> +
> +    //
> +    // Retry when BMC is not ready.
> +    //
> +    if ((Response->StatusCode != NULL)) {
> +      DEBUG_CODE (
> +        DumpRedfishResponse (NULL, DEBUG_ERROR, Response);
> +        );
> +
> +      if (*Response->StatusCode !=
> HTTP_STATUS_500_INTERNAL_SERVER_ERROR) {
> +        break;
> +      }
> +
> +      FreePool (Response->StatusCode);
> +      Response->StatusCode = NULL;
> +    }
> +
> +    DEBUG ((DEBUG_WARN, "%a: RedfishGetByUri failed, retry (%d/%d)\n",
> __func__, RetryCount, REDFISH_HTTP_GET_RETRY_MAX));
> +    gBS->Stall (REDFISH_HTTP_RETRY_WAIT);
> +  } while (TRUE);
> +
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "%a: get %a failed (%d/%d): %r\n", __func__,
> AsciiUri, RetryCount, REDFISH_HTTP_GET_RETRY_MAX, Status));
> +    if (Response->Payload != NULL) {
> +      RedfishFreeResponse (
> +        NULL,
> +        0,
> +        NULL,
> +        Response->Payload
> +        );
> +      Response->Payload = NULL;
> +    }
> +
> +    goto ON_RELEASE;
> +  }
> +
> +  //
> +  // Keep response in cache list
> +  //
> +  Status = AddHttpCacheData (&mRedfishHttpCachePrivate->CacheList, Uri,
> Response);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "%a: failed to cache %s: %r\n", __func__, Uri,
> Status));
> +    goto ON_RELEASE;
> +  }
> +
> +  DEBUG_CODE (
> +    DumpHttpCacheList (__func__, REDFISH_HTTP_CACHE_DEBUG_DUMP,
> &mRedfishHttpCachePrivate->CacheList);
> +    );
> +
> +ON_RELEASE:
> +
> +  if (AsciiUri != NULL) {
> +    FreePool (AsciiUri);
> +  }
> +
> +  return Status;
> +}
> +
> +/**
> +  Reset the cached data specified by given URI. When response data
> +  returned by RedfishHttpResetResource() is modified, the response
> +  data can not be used by other caller. Application calls this
> +  function to make this data to be stale data and
> +  RedfishHttpResetResource() will get latest data from remote server
> +  again.
> +
> +  @param[in]  Uri           Target resource URI.
> +
> +  @retval     EFI_SUCCESS     Resrouce is reset successfully.
> +  @retval     Others          Errors occur.
> +
> +**/
> +EFI_STATUS
> +RedfishHttpResetResource (
> +  IN  EFI_STRING  Uri
> +  )
> +{
> +  REDFISH_HTTP_CACHE_DATA  *CacheData;
> +
> +  if (IS_EMPTY_STRING (Uri)) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  if (mRedfishHttpCachePrivate == NULL) {
> +    return EFI_NOT_READY;
> +  }
> +
> +  CacheData = FindHttpCacheData (&mRedfishHttpCachePrivate-
> >CacheList.Head, Uri);
> +  if (CacheData == NULL) {
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  DeleteHttpCacheData (&mRedfishHttpCachePrivate->CacheList, CacheData);
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +
> +  Initial HTTP cache library instance.
> +
> +  @param[in] ImageHandle     The image handle.
> +  @param[in] SystemTable     The system table.
> +
> +  @retval  EFI_SUCCESS  Initial library successfully.
> +  @retval  Other        Return error status.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +RedfishHttpCacheConstructor (
> +  IN EFI_HANDLE        ImageHandle,
> +  IN EFI_SYSTEM_TABLE  *SystemTable
> +  )
> +{
> +  mRedfishHttpCachePrivate = AllocateZeroPool (sizeof
> (REDFISH_HTTP_CACHE_PRIVATE));
> +  if (mRedfishHttpCachePrivate == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  //
> +  // Initial cache list
> +  //
> +  mRedfishHttpCachePrivate->CacheList.Capacity =
> REDFISH_HTTP_CACHE_LIST_SIZE;
> +  mRedfishHttpCachePrivate->CacheList.Count    = 0x00;
> +  InitializeListHead (&mRedfishHttpCachePrivate->CacheList.Head);
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Release allocated resource.
> +
> +  @param[in] ImageHandle       Handle that identifies the image to be
> unloaded.
> +  @param[in] SystemTable      The system table.
> +
> +  @retval EFI_SUCCESS      The image has been unloaded.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +RedfishHttpCacheDestructor (
> +  IN EFI_HANDLE        ImageHandle,
> +  IN EFI_SYSTEM_TABLE  *SystemTable
> +  )
> +{
> +  if (mRedfishHttpCachePrivate != NULL) {
> +    if (!IsListEmpty (&mRedfishHttpCachePrivate->CacheList.Head)) {
> +      ReleaseCacheList (&mRedfishHttpCachePrivate->CacheList);
> +    }
> +
> +    FreePool (mRedfishHttpCachePrivate);
> +    mRedfishHttpCachePrivate = NULL;
> +  }
> +
> +  return EFI_SUCCESS;
> +}
> --
> 2.34.1



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Re: [edk2-devel] [edk2-redfish-client][PATCH 01/10] RedfishClientPkg: introduce Redfish HTTP cache library

[Nickle Wang via groups.io]

Thanks Abner. Version 2 patch series is sent for review.

Regards,
Nickle

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Chang, Abner
> via groups.io
> Sent: Wednesday, January 3, 2024 9:02 PM
> To: Nickle Wang <nicklew@nvidia.com>; devel@edk2.groups.io
> Cc: Igor Kulchytskyy <igork@ami.com>; Nick Ramirez <nramirez@nvidia.com>
> Subject: Re: [edk2-devel] [edk2-redfish-client][PATCH 01/10] RedfishClientPkg:
> introduce Redfish HTTP cache library
> 
> External email: Use caution opening links or attachments
> 
> 
> [AMD Official Use Only - General]
> 
> Hi Nickle,
> I have no problem with this feature as we have been using this for a while. Per
> discussion off line,  HttpCacheLibrary would be replaced with protocol version
> later. I would just give my RB to this patch as this patch is sent for cleaning up the
> backlogs we are going to upstream.
> But before we merging this patch, could you please replace all "BMC" term in
> these files with either Redfish service or service? Thanks.
> 
> Abner
> 
> > -----Original Message-----
> > From: Nickle Wang <nicklew@nvidia.com>
> > Sent: Wednesday, January 3, 2024 8:00 PM
> > To: devel@edk2.groups.io
> > Cc: Chang, Abner <Abner.Chang@amd.com>; Igor Kulchytskyy
> > <igork@ami.com>; Nick Ramirez <nramirez@nvidia.com>
> > Subject: [edk2-redfish-client][PATCH 01/10] RedfishClientPkg:
> > introduce Redfish HTTP cache library
> >
> > Caution: This message originated from an External Source. Use proper
> > caution when opening attachments, clicking links, or responding.
> >
> >
> > Introduce RedfishHttpCacheLib to improve HTTP GET performance in
> > Redfish feature drivers. Feature drivers often query same Redfish
> > resource multiple times for different purpose. Add HTTP cache
> > mechanism to improve the performance.
> >
> > Signed-off-by: Nickle Wang <nicklew@nvidia.com>
> > Cc: Abner Chang <abner.chang@amd.com>
> > Cc: Igor Kulchytskyy <igork@ami.com>
> > Cc: Nick Ramirez <nramirez@nvidia.com>
> > ---
> >  RedfishClientPkg/RedfishClientPkg.dec         |   3 +-
> >  RedfishClientPkg/RedfishClientLibs.dsc.inc    |   3 +-
> >  RedfishClientPkg/RedfishClientPkg.dsc         |   3 +-
> >  .../RedfishHttpCacheLib.inf                   |  48 ++
> >  .../Include/Library/RedfishHttpCacheLib.h     |  59 ++
> >  .../RedfishHttpCacheLibInternal.h             |  63 ++
> >  .../RedfishHttpCacheLib/RedfishHttpCacheLib.c | 774
> > ++++++++++++++++++
> >  7 files changed, 950 insertions(+), 3 deletions(-)  create mode
> > 100644
> > RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> >  create mode 100644
> > RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> >  create mode 100644
> > RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibIntern
> > al.h
> >  create mode 100644
> > RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
> >
> > diff --git a/RedfishClientPkg/RedfishClientPkg.dec
> > b/RedfishClientPkg/RedfishClientPkg.dec
> > index 5f8a0350..b350faca 100644
> > --- a/RedfishClientPkg/RedfishClientPkg.dec
> > +++ b/RedfishClientPkg/RedfishClientPkg.dec
> > @@ -2,7 +2,7 @@
> >  # Redfish Client Package
> >  #
> >  # (C) Copyright 2021-2022 Hewlett Packard Enterprise Development
> > LP<BR> -# Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES.
> > All rights reserved.
> > +# Copyright (c) 2022-2024, NVIDIA CORPORATION & AFFILIATES. All
> > +rights
> > reserved.
> >  #
> >  # SPDX-License-Identifier: BSD-2-Clause-Patent  ## @@ -26,6 +26,7 @@
> >
> > EdkIIRedfishResourceConfigLib|Include/Library/EdkIIRedfishResourceConf
> > EdkIIRedfishResourceConfigLib|igLi
> > b.h
> >    RedfishEventLib|Include/Library/RedfishEventLib.h
> >    RedfishVersionLib|Include/Library/RedfishVersionLib.h
> > +  RedfishHttpCacheLib|Include/Library/RedfishHttpCacheLib.h
> >
> >  [LibraryClasses.Common.Private]
> >    ##  @libraryclass Redfish Helper Library diff --git
> > a/RedfishClientPkg/RedfishClientLibs.dsc.inc
> > b/RedfishClientPkg/RedfishClientLibs.dsc.inc
> > index 5eae6711..572f426e 100644
> > --- a/RedfishClientPkg/RedfishClientLibs.dsc.inc
> > +++ b/RedfishClientPkg/RedfishClientLibs.dsc.inc
> > @@ -6,7 +6,7 @@
> >  # of EDKII network library classes.
> >  #
> >  # (C) Copyright 2021-2022 Hewlett Packard Enterprise Development
> > LP<BR> -# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All
> > rights reserved.
> > +# Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All
> > +rights
> > reserved.
> >  #
> >  #    SPDX-License-Identifier: BSD-2-Clause-Patent
> >  #
> > @@ -40,3 +40,4 @@
> >
> > RedfishVersionLib|RedfishClientPkg/Library/RedfishVersionLib/RedfishVe
> > RedfishVersionLib|rsio
> > nLib.inf
> >
> > RedfishAddendumLib|RedfishClientPkg/Library/RedfishAddendumLib/Redfis
> > hAddendumLib.inf
> >
> > RedfishDebugLib|RedfishPkg/Library/RedfishDebugLib/RedfishDebugLib.inf
> > +
> > RedfishHttpCacheLib|RedfishClientPkg/Library/RedfishHttpCacheLib/Redfi
> > RedfishHttpCacheLib|sh
> > HttpCacheLib.inf
> > diff --git a/RedfishClientPkg/RedfishClientPkg.dsc
> > b/RedfishClientPkg/RedfishClientPkg.dsc
> > index e16c91b8..0e3ef1ac 100644
> > --- a/RedfishClientPkg/RedfishClientPkg.dsc
> > +++ b/RedfishClientPkg/RedfishClientPkg.dsc
> > @@ -2,7 +2,7 @@
> >  # Redfish Client Package
> >  #
> >  # (C) Copyright 2021 Hewlett-Packard Enterprise Development LP.
> > -# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights
> > reserved.
> > +# Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All
> > +rights
> > reserved.
> >  #
> >  #    SPDX-License-Identifier: BSD-2-Clause-Patent
> >  #
> > @@ -61,5 +61,6 @@
> >
> > RedfishClientPkg/Library/RedfishFeatureUtilityLib/RedfishFeatureUtilityLib.inf
> >    RedfishClientPkg/PrivateLibrary/RedfishLib/RedfishLib.inf
> >    RedfishClientPkg/Library/RedfishAddendumLib/RedfishAddendumLib.inf
> > +
> > + RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> >
> >    !include RedfishClientPkg/RedfishClient.dsc.inc
> > diff --git
> > a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> > b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> > new file mode 100644
> > index 00000000..32da4f83
> > --- /dev/null
> > +++
> > b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.inf
> > @@ -0,0 +1,48 @@
> > +## @file
> > +#  Redfish HTTP cache library helps Redfish application to get
> > +Redfish
> > resource
> > +#  from BMC with cache mechanism enabled.
> > +#
> > +#  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All
> > +rights
> > reserved.
> > +#
> > +#  SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> > +
> > +[Defines]
> > +  INF_VERSION                    = 0x00010006
> > +  BASE_NAME                      = RedfishHttpCacheLib
> > +  FILE_GUID                      = 21F8FEEC-023C-451D-824D-823058FD9481
> > +  MODULE_TYPE                    = DXE_DRIVER
> > +  VERSION_STRING                 = 1.0
> > +  LIBRARY_CLASS                  = RedfishHttpCacheLib| DXE_DRIVER UEFI_DRIVER
> > +  CONSTRUCTOR                    = RedfishHttpCacheConstructor
> > +  DESTRUCTOR                     = RedfishHttpCacheDestructor
> > +
> > +#
> > +#  VALID_ARCHITECTURES           = IA32 X64 EBC
> > +#
> > +
> > +[Sources]
> > +  RedfishHttpCacheLibInternal.h
> > +  RedfishHttpCacheLib.c
> > +
> > +[Packages]
> > +  MdePkg/MdePkg.dec
> > +  MdeModulePkg/MdeModulePkg.dec
> > +  RedfishPkg/RedfishPkg.dec
> > +  RedfishClientPkg/RedfishClientPkg.dec
> > +
> > +[LibraryClasses]
> > +  BaseLib
> > +  DebugLib
> > +  UefiBootServicesTableLib
> > +  MemoryAllocationLib
> > +  RedfishLib
> > +  UefiLib
> > +  RedfishDebugLib
> > +  ReportStatusCodeLib
> > +  PrintLib
> > +
> > +[depex]
> > +  TRUE
> > +
> > diff --git a/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> > b/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> > new file mode 100644
> > index 00000000..1277b981
> > --- /dev/null
> > +++ b/RedfishClientPkg/Include/Library/RedfishHttpCacheLib.h
> > @@ -0,0 +1,59 @@
> > +/** @file
> > +  This file defines the Redfish HTTP cache library interface.
> > +
> > +  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All
> > + rights
> > reserved.
> > +
> > +  SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#ifndef REDFISH_HTTP_CACHE_LIB_H_
> > +#define REDFISH_HTTP_CACHE_LIB_H_
> > +
> > +#include <Uefi.h>
> > +#include <Library/RedfishLib.h>
> > +
> > +/**
> > +  Get redfish resource from given resource URI with cache mechanism
> > +  supported. It's caller's responsibility to Response by calling
> > +  RedfishFreeResponse ().
> > +
> > +  @param[in]  Service       Redfish service instance to make query.
> > +  @param[in]  Uri           Target resource URI.
> > +  @param[out] Response      HTTP response from redfish service.
> > +  @param[in]  UseCache      If it is TRUE, this function will search for
> > +                            cache first. If it is FALSE, this function
> > +                            will query Redfish URI directly.
> > +
> > +  @retval     EFI_SUCCESS     Resrouce is returned successfully.
> > +  @retval     Others          Errors occur.
> > +
> > +**/
> > +EFI_STATUS
> > +RedfishHttpGetResource (
> > +  IN  REDFISH_SERVICE   Service,
> > +  IN  EFI_STRING        Uri,
> > +  OUT REDFISH_RESPONSE  *Response,
> > +  IN  BOOLEAN           UseCache
> > +  );
> > +
> > +/**
> > +  Reset the cached data specified by given URI. When response data
> > +  returned by RedfishHttpResetResource() is modified, the response
> > +  data can not be used by other caller. Application calls this
> > +  function to make this data to be stale data and
> > +  RedfishHttpResetResource() will get latest data from remote server
> > +  again.
> > +
> > +  @param[in]  Uri           Target resource URI.
> > +
> > +  @retval     EFI_SUCCESS     Resrouce is reset successfully.
> > +  @retval     Others          Errors occur.
> > +
> > +**/
> > +EFI_STATUS
> > +RedfishHttpResetResource (
> > +  IN  EFI_STRING  Uri
> > +  );
> > +
> > +#endif
> > diff --git
> > a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInte
> > rna
> > l.h
> > b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInte
> > rna
> > l.h
> > new file mode 100644
> > index 00000000..2549335d
> > --- /dev/null
> > +++
> > b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLibInte
> > rna
> > l.h
> > @@ -0,0 +1,63 @@
> > +/** @file
> > +  This file defines the Redfish HTTP cache library internal headers.
> > +
> > +  Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights
> > reserved.
> > +
> > +  SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#ifndef REDFISH_HTTP_CACHE_INTERNAL_LIB_H_
> > +#define REDFISH_HTTP_CACHE_INTERNAL_LIB_H_
> > +
> > +#include <Uefi.h>
> > +#include <RedfishBase.h>
> > +
> > +#include <Library/UefiLib.h>
> > +#include <Library/BaseLib.h>
> > +#include <Library/DebugLib.h>
> > +#include <Library/RedfishLib.h>
> > +#include <Library/UefiBootServicesTableLib.h>
> > +#include <Library/MemoryAllocationLib.h> #include
> > +<Library/RedfishHttpCacheLib.h> #include <Library/RedfishDebugLib.h>
> > +#include <Library/ReportStatusCodeLib.h> #include
> > +<Library/PrintLib.h>
> > +
> > +#define REDFISH_HTTP_CACHE_LIST_SIZE   0x0F
> > +#define REDFISH_HTTP_GET_RETRY_MAX     0x0F
> > +#define REDFISH_HTTP_RETRY_WAIT        (2 * 1000000U)  ///< 1 second
> > +#define REDFISH_ERROR_MSG_MAX          128
> > +#define REDFISH_HTTP_ERROR_REPORT      "Redfish HTTP failure(0x%x): %a"
> > +#define REDFISH_HTTP_CACHE_DEBUG       DEBUG_VERBOSE
> > +#define REDFISH_HTTP_CACHE_DEBUG_DUMP  DEBUG_VERBOSE
> > +
> > +///
> > +/// Definition of REDFISH_HTTP_CACHE_DATA /// typedef struct {
> > +  LIST_ENTRY          List;
> > +  EFI_STRING          Uri;
> > +  UINTN               HitCount;
> > +  REDFISH_RESPONSE    *Response;
> > +} REDFISH_HTTP_CACHE_DATA;
> > +
> > +#define REDFISH_HTTP_CACHE_FROM_LIST(a)  BASE_CR (a,
> > REDFISH_HTTP_CACHE_DATA, List)
> > +
> > +///
> > +/// Definition of REDFISH_HTTP_CACHE_LIST /// typedef struct {
> > +  LIST_ENTRY    Head;
> > +  UINTN         Count;
> > +  UINTN         Capacity;
> > +} REDFISH_HTTP_CACHE_LIST;
> > +
> > +///
> > +/// Definition of REDFISH_HTTP_CACHE_PRIVATE /// typedef struct {
> > +  REDFISH_HTTP_CACHE_LIST    CacheList;
> > +} REDFISH_HTTP_CACHE_PRIVATE;
> > +
> > +#endif
> > diff --git
> > a/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
> > b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib.c
> > new file mode 100644
> > index 00000000..c751e608
> > --- /dev/null
> > +++ b/RedfishClientPkg/Library/RedfishHttpCacheLib/RedfishHttpCacheLib
> > +++ .c
> > @@ -0,0 +1,774 @@
> > +/** @file
> > +  Redfish HTTP cache library helps Redfish application to get Redfish
> > +resource
> > +  from BMC with cache mechanism enabled.
> > +
> > +  Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All
> > + rights
> > reserved.
> > +
> > +  SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#include "RedfishHttpCacheLibInternal.h"
> > +
> > +REDFISH_HTTP_CACHE_PRIVATE  *mRedfishHttpCachePrivate = NULL;
> > +
> > +/**
> > +  This function copy the data in SrcResponse to DstResponse.
> > +
> > +  @param[in]  SrcResponse      Source Response to copy.
> > +  @param[out] DstResponse      Destination Response.
> > +
> > +  @retval     EFI_SUCCESS      Response is copied successfully.
> > +  @retval     Others           Error occurs.
> > +
> > +**/
> > +EFI_STATUS
> > +CopyRedfishResponse (
> > +  IN  REDFISH_RESPONSE  *SrcResponse,
> > +  OUT REDFISH_RESPONSE  *DstResponse
> > +  )
> > +{
> > +  EDKII_JSON_VALUE  JsonValue;
> > +  REDFISH_SERVICE   Service;
> > +  UINTN             Index;
> > +
> > +  if ((SrcResponse == NULL) || (DstResponse == NULL)) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  if (SrcResponse == DstResponse) {
> > +    return EFI_SUCCESS;
> > +  }
> > +
> > +  //
> > +  // Status code
> > +  //
> > +  if (SrcResponse->StatusCode != NULL) {
> > +    DstResponse->StatusCode = AllocateCopyPool (sizeof
> > (EFI_HTTP_STATUS_CODE), SrcResponse->StatusCode);
> > +    if (DstResponse->StatusCode == NULL) {
> > +      goto ON_ERROR;
> > +    }
> > +  }
> > +
> > +  //
> > +  // Header
> > +  //
> > +  if ((SrcResponse->HeaderCount > 0) && (SrcResponse->Headers != NULL)) {
> > +    DstResponse->HeaderCount = 0;
> > +    DstResponse->Headers     = AllocateZeroPool (sizeof (EFI_HTTP_HEADER) *
> > SrcResponse->HeaderCount);
> > +    if (DstResponse->Headers == NULL) {
> > +      goto ON_ERROR;
> > +    }
> > +
> > +    for (Index = 0; Index < SrcResponse->HeaderCount; Index++) {
> > +      DstResponse->Headers[Index].FieldName = AllocateCopyPool
> > + (AsciiStrSize
> > (SrcResponse->Headers[Index].FieldName), SrcResponse-
> > >Headers[Index].FieldName);
> > +      if (DstResponse->Headers[Index].FieldName == NULL) {
> > +        goto ON_ERROR;
> > +      }
> > +
> > +      DstResponse->Headers[Index].FieldValue = AllocateCopyPool
> > + (AsciiStrSize
> > (SrcResponse->Headers[Index].FieldValue), SrcResponse-
> > >Headers[Index].FieldValue);
> > +      if (DstResponse->Headers[Index].FieldValue == NULL) {
> > +        goto ON_ERROR;
> > +      }
> > +
> > +      DstResponse->HeaderCount += 1;
> > +    }
> > +  }
> > +
> > +  //
> > +  // Payload
> > +  //
> > +  if (SrcResponse->Payload != NULL) {
> > +    Service              = RedfishServiceInPayload (SrcResponse->Payload);
> > +    JsonValue            = RedfishJsonInPayload (SrcResponse->Payload);
> > +    DstResponse->Payload = RedfishCreatePayload (JsonValue, Service);
> > +    if (DstResponse->Payload  == NULL) {
> > +      goto ON_ERROR;
> > +    }
> > +  }
> > +
> > +  return EFI_SUCCESS;
> > +
> > +ON_ERROR:
> > +
> > +  RedfishFreeResponse (
> > +    DstResponse->StatusCode,
> > +    DstResponse->HeaderCount,
> > +    DstResponse->Headers,
> > +    DstResponse->Payload
> > +    );
> > +
> > +  return EFI_OUT_OF_RESOURCES;
> > +}
> > +
> > +/**
> > +  This function clone input response and return to caller
> > +
> > +  @param[in]  Response      Response to clone.
> > +
> > +  @retval     REDFISH_RESPONSE *  Response is cloned.
> > +  @retval     NULL                Errors occur.
> > +
> > +**/
> > +REDFISH_RESPONSE *
> > +CloneRedfishResponse (
> > +  IN REDFISH_RESPONSE  *Response
> > +  )
> > +{
> > +  EFI_STATUS        Status;
> > +  REDFISH_RESPONSE  *NewResponse;
> > +
> > +  if (Response == NULL) {
> > +    return NULL;
> > +  }
> > +
> > +  NewResponse = AllocateZeroPool (sizeof (REDFISH_RESPONSE));  if
> > + (NewResponse == NULL) {
> > +    return NULL;
> > +  }
> > +
> > +  Status = CopyRedfishResponse (Response, NewResponse);  if
> > + (EFI_ERROR (Status)) {
> > +    FreePool (NewResponse);
> > +    return NULL;
> > +  }
> > +
> > +  return NewResponse;
> > +}
> > +
> > +/**
> > +
> > +  Convert Unicode string to ASCII string. It's call responsibility to
> > + release
> > returned buffer.
> > +
> > +  @param[in]  UnicodeStr      Unicode string to convert.
> > +
> > +  @retval     CHAR8 *         ASCII string returned.
> > +  @retval     NULL            Errors occur.
> > +
> > +**/
> > +CHAR8 *
> > +StringUnicodeToAscii (
> > +  IN EFI_STRING  UnicodeStr
> > +  )
> > +{
> > +  CHAR8       *AsciiStr;
> > +  UINTN       AsciiStrSize;
> > +  EFI_STATUS  Status;
> > +
> > +  if (IS_EMPTY_STRING (UnicodeStr)) {
> > +    return NULL;
> > +  }
> > +
> > +  AsciiStrSize = StrLen (UnicodeStr) + 1;
> > +  AsciiStr     = AllocatePool (AsciiStrSize);
> > +  if (AsciiStr == NULL) {
> > +    return NULL;
> > +  }
> > +
> > +  Status = UnicodeStrToAsciiStrS (UnicodeStr, AsciiStr,
> > + AsciiStrSize);  if (EFI_ERROR (Status)) {
> > +    DEBUG ((DEBUG_ERROR, "UnicodeStrToAsciiStrS failed: %r\n", Status));
> > +    FreePool (AsciiStr);
> > +    return NULL;
> > +  }
> > +
> > +  return AsciiStr;
> > +}
> > +
> > +/**
> > +  Release REDFISH_HTTP_CACHE_DATA resource
> > +
> > +  @param[in]    Data    Pointer to REDFISH_HTTP_CACHE_DATA instance
> > +
> > +  @retval EFI_SUCCESS             REDFISH_HTTP_CACHE_DATA is released
> > successfully.
> > +  @retval EFI_INVALID_PARAMETER   Data is NULL
> > +
> > +**/
> > +EFI_STATUS
> > +ReleaseHttpCacheData (
> > +  IN REDFISH_HTTP_CACHE_DATA  *Data
> > +  )
> > +{
> > +  if (Data == NULL) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  if (Data->Uri != NULL) {
> > +    FreePool (Data->Uri);
> > +  }
> > +
> > +  if (Data->Response != NULL) {
> > +    if (Data->Response->Payload != NULL) {
> > +      RedfishFreeResponse (
> > +        Data->Response->StatusCode,
> > +        Data->Response->HeaderCount,
> > +        Data->Response->Headers,
> > +        Data->Response->Payload
> > +        );
> > +      FreePool (Data->Response);
> > +    }
> > +  }
> > +
> > +  FreePool (Data);
> > +
> > +  return EFI_SUCCESS;
> > +}
> > +
> > +/**
> > +  Create new cache data.
> > +
> > +  @param[in]    Uri       The URI string matching to this cache data.
> > +  @param[in]    Response  HTTP response.
> > +
> > +  @retval REDFISH_HTTP_CACHE_DATA *   Pointer to newly created cache
> > data.
> > +  @retval NULL                        No memory available.
> > +
> > +**/
> > +REDFISH_HTTP_CACHE_DATA *
> > +NewHttpCacheData (
> > +  IN  EFI_STRING        Uri,
> > +  IN  REDFISH_RESPONSE  *Response
> > +  )
> > +{
> > +  REDFISH_HTTP_CACHE_DATA  *NewData;
> > +  UINTN                    Size;
> > +
> > +  if (IS_EMPTY_STRING (Uri) || (Response == NULL)) {
> > +    return NULL;
> > +  }
> > +
> > +  NewData = AllocateZeroPool (sizeof (REDFISH_HTTP_CACHE_DATA));  if
> > + (NewData == NULL) {
> > +    return NULL;
> > +  }
> > +
> > +  Size         = StrSize (Uri);
> > +  NewData->Uri = AllocateCopyPool (Size, Uri);  if (NewData->Uri ==
> > + NULL) {
> > +    goto ON_ERROR;
> > +  }
> > +
> > +  NewData->Response = Response;
> > +  NewData->HitCount = 1;
> > +
> > +  return NewData;
> > +
> > +ON_ERROR:
> > +
> > +  if (NewData != NULL) {
> > +    ReleaseHttpCacheData (NewData);
> > +  }
> > +
> > +  return NULL;
> > +}
> > +
> > +/**
> > +  Search on given ListHeader for given URI string.
> > +
> > +  @param[in]    ListHeader  Target list to search.
> > +  @param[in]    Uri         Target URI to search.
> > +
> > +  @retval REDFISH_HTTP_CACHE_DATA   Target cache data is found.
> > +  @retval NULL                      No cache data with given URI is found.
> > +
> > +**/
> > +REDFISH_HTTP_CACHE_DATA *
> > +FindHttpCacheData (
> > +  IN  LIST_ENTRY  *ListHeader,
> > +  IN  EFI_STRING  Uri
> > +  )
> > +{
> > +  LIST_ENTRY               *List;
> > +  REDFISH_HTTP_CACHE_DATA  *Data;
> > +
> > +  if (IS_EMPTY_STRING (Uri)) {
> > +    return NULL;
> > +  }
> > +
> > +  if (IsListEmpty (ListHeader)) {
> > +    return NULL;
> > +  }
> > +
> > +  Data = NULL;
> > +  List = GetFirstNode (ListHeader);
> > +  while (!IsNull (ListHeader, List)) {
> > +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> > +
> > +    if (StrCmp (Data->Uri, Uri) == 0) {
> > +      return Data;
> > +    }
> > +
> > +    List = GetNextNode (ListHeader, List);  }
> > +
> > +  return NULL;
> > +}
> > +
> > +/**
> > +  Search on given ListHeader and return cache data with minimum hit count.
> > +
> > +  @param[in]    ListHeader  Target list to search.
> > +
> > +  @retval REDFISH_HTTP_CACHE_DATA   Target cache data is returned.
> > +  @retval NULL                      No cache data is found.
> > +
> > +**/
> > +REDFISH_HTTP_CACHE_DATA *
> > +FindUnusedHttpCacheData (
> > +  IN  LIST_ENTRY  *ListHeader
> > +  )
> > +{
> > +  LIST_ENTRY               *List;
> > +  REDFISH_HTTP_CACHE_DATA  *Data;
> > +  REDFISH_HTTP_CACHE_DATA  *UnusedData;
> > +  UINTN                    HitCount;
> > +
> > +  if (IsListEmpty (ListHeader)) {
> > +    return NULL;
> > +  }
> > +
> > +  Data       = NULL;
> > +  UnusedData = NULL;
> > +  HitCount   = 0;
> > +
> > +  List       = GetFirstNode (ListHeader);
> > +  Data       = REDFISH_HTTP_CACHE_FROM_LIST (List);
> > +  UnusedData = Data;
> > +  HitCount   = Data->HitCount;
> > +  List       = GetNextNode (ListHeader, List);
> > +
> > +  while (!IsNull (ListHeader, List)) {
> > +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> > +
> > +    if (Data->HitCount < HitCount) {
> > +      HitCount   = Data->HitCount;
> > +      UnusedData = Data;
> > +    }
> > +
> > +    List = GetNextNode (ListHeader, List);  }
> > +
> > +  return UnusedData;
> > +}
> > +
> > +/**
> > +  Delete a cache data by given cache instance.
> > +
> > +  @param[in]    List    Target cache list to be removed.
> > +  @param[in]    Data    Pointer to the instance to be deleted.
> > +
> > +  @retval EFI_SUCCESS   Cache data is removed.
> > +  @retval Others        Fail to remove cache data.
> > +
> > +**/
> > +EFI_STATUS
> > +DeleteHttpCacheData (
> > +  IN  REDFISH_HTTP_CACHE_LIST  *List,
> > +  IN  REDFISH_HTTP_CACHE_DATA  *Data
> > +  )
> > +{
> > +  if ((List == NULL) || (Data == NULL)) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: delete: %s\n", __func__,
> > Data->Uri));
> > +
> > +  RemoveEntryList (&Data->List);
> > +  --List->Count;
> > +
> > +  return ReleaseHttpCacheData (Data); }
> > +
> > +/**
> > +  Add new cache by given URI and HTTP response to specify List.
> > +
> > +  @param[in]    List      Target cache list to add.
> > +  @param[in]    Uri       The URI string matching to this cache data.
> > +  @param[in]    Response  HTTP response.
> > +
> > +  @retval EFI_SUCCESS   Cache data is added.
> > +  @retval Others        Fail to add cache data.
> > +
> > +**/
> > +EFI_STATUS
> > +AddHttpCacheData (
> > +  IN  REDFISH_HTTP_CACHE_LIST  *List,
> > +  IN  EFI_STRING               Uri,
> > +  IN  REDFISH_RESPONSE         *Response
> > +  )
> > +{
> > +  REDFISH_HTTP_CACHE_DATA  *NewData;
> > +  REDFISH_HTTP_CACHE_DATA  *OldData;
> > +  REDFISH_HTTP_CACHE_DATA  *UnusedData;
> > +  REDFISH_RESPONSE         *NewResponse;
> > +
> > +  if ((List == NULL) || IS_EMPTY_STRING (Uri) || (Response == NULL)) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  //
> > +  // If same cache data exist, replace it with latest one.
> > +  //
> > +  OldData = FindHttpCacheData (&List->Head, Uri);  if (OldData !=
> > + NULL) {
> > +    DeleteHttpCacheData (List, OldData);  }
> > +
> > +  //
> > +  // Check capacity
> > +  //
> > +  if (List->Count >= List->Capacity) {
> > +    DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: list is full and retire
> > + unused
> > cache\n", __func__));
> > +    UnusedData = FindUnusedHttpCacheData (&List->Head);
> > +    if (UnusedData == NULL) {
> > +      return EFI_OUT_OF_RESOURCES;
> > +    }
> > +
> > +    DeleteHttpCacheData (List, UnusedData);  }
> > +
> > +  //
> > +  // Clone a local copy
> > +  //
> > +  NewResponse = CloneRedfishResponse (Response);  if (NewResponse ==
> > + NULL) {
> > +    return EFI_OUT_OF_RESOURCES;
> > +  }
> > +
> > +  NewData = NewHttpCacheData (Uri, NewResponse);  if (NewData ==
> > + NULL) {
> > +    return EFI_OUT_OF_RESOURCES;
> > +  }
> > +
> > +  InsertTailList (&List->Head, &NewData->List);  ++List->Count;
> > +
> > +  DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: cache(%d/%d) %s\n",
> > __func__, List->Count, List->Capacity, NewData->Uri));
> > +
> > +  return EFI_SUCCESS;
> > +}
> > +
> > +/**
> > +  Release all cache from list.
> > +
> > +  @param[in]    CacheList    The list to be released.
> > +
> > +  @retval EFI_SUCCESS             All cache data are released.
> > +  @retval EFI_INVALID_PARAMETER   CacheList is NULL.
> > +
> > +**/
> > +EFI_STATUS
> > +ReleaseCacheList (
> > +  IN  REDFISH_HTTP_CACHE_LIST  *CacheList
> > +  )
> > +{
> > +  LIST_ENTRY               *List;
> > +  LIST_ENTRY               *Next;
> > +  REDFISH_HTTP_CACHE_DATA  *Data;
> > +
> > +  if (CacheList == NULL) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  if (IsListEmpty (&CacheList->Head)) {
> > +    return EFI_SUCCESS;
> > +  }
> > +
> > +  Data = NULL;
> > +  Next = NULL;
> > +  List = GetFirstNode (&CacheList->Head);  while (!IsNull
> > + (&CacheList->Head, List)) {
> > +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> > +    Next = GetNextNode (&CacheList->Head, List);
> > +
> > +    DeleteHttpCacheData (CacheList, Data);
> > +
> > +    List = Next;
> > +  }
> > +
> > +  return EFI_SUCCESS;
> > +}
> > +
> > +/**
> > +  Debug output the cache list.
> > +
> > +  @param[in]    Msg            Debug message string.
> > +  @param[in]    ErrorLevel     Output error level.
> > +  @param[in]    CacheList      Target list to dump.
> > +
> > +  @retval EFI_SUCCESS             Debug dump finished.
> > +  @retval EFI_INVALID_PARAMETER   HttpCacheList is NULL.
> > +
> > +**/
> > +EFI_STATUS
> > +DumpHttpCacheList (
> > +  IN  CONST CHAR8              *Msg,
> > +  IN  UINTN                    ErrorLevel,
> > +  IN  REDFISH_HTTP_CACHE_LIST  *CacheList
> > +  )
> > +{
> > +  LIST_ENTRY               *List;
> > +  REDFISH_HTTP_CACHE_DATA  *Data;
> > +  UINTN                    Index;
> > +
> > +  if (CacheList == NULL) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  if (!IS_EMPTY_STRING (Msg)) {
> > +    DEBUG ((ErrorLevel, "%a\n", Msg));  }
> > +
> > +  if (IsListEmpty (&CacheList->Head)) {
> > +    DEBUG ((ErrorLevel, "list is empty\n"));
> > +    return EFI_NOT_FOUND;
> > +  }
> > +
> > +  DEBUG ((ErrorLevel, "list count: %d capacity: %d\n",
> > + CacheList->Count,
> > CacheList->Capacity));
> > +  Data  = NULL;
> > +  Index = 0;
> > +  List  = GetFirstNode (&CacheList->Head);  while (!IsNull
> > + (&CacheList->Head, List)) {
> > +    Data = REDFISH_HTTP_CACHE_FROM_LIST (List);
> > +
> > +    DEBUG ((ErrorLevel, "%d) Uri: %s Hit: %d\n", ++Index, Data->Uri,
> > + Data-
> > >HitCount));
> > +
> > +    List = GetNextNode (&CacheList->Head, List);  }
> > +
> > +  return EFI_SUCCESS;
> > +}
> > +
> > +/**
> > +  Get redfish resource from given resource URI with cache mechanism
> > +  supported. It's caller's responsibility to Response by calling
> > +  RedfishFreeResponse ().
> > +
> > +  @param[in]  Service       Redfish service instance to make query.
> > +  @param[in]  Uri           Target resource URI.
> > +  @param[out] Response      HTTP response from redfish service.
> > +  @param[in]  UseCache      If it is TRUE, this function will search for
> > +                            cache first. If it is FALSE, this function
> > +                            will query Redfish URI directly.
> > +
> > +  @retval     EFI_SUCCESS     Resrouce is returned successfully.
> > +  @retval     Others          Errors occur.
> > +
> > +**/
> > +EFI_STATUS
> > +RedfishHttpGetResource (
> > +  IN  REDFISH_SERVICE   Service,
> > +  IN  EFI_STRING        Uri,
> > +  OUT REDFISH_RESPONSE  *Response,
> > +  IN  BOOLEAN           UseCache
> > +  )
> > +{
> > +  EFI_STATUS               Status;
> > +  CHAR8                    *AsciiUri;
> > +  REDFISH_HTTP_CACHE_DATA  *CacheData;
> > +  UINTN                    RetryCount;
> > +
> > +  if ((Service == NULL) || (Response == NULL) || IS_EMPTY_STRING (Uri)) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  if (mRedfishHttpCachePrivate == NULL) {
> > +    return EFI_NOT_READY;
> > +  }
> > +
> > +  AsciiUri   = NULL;
> > +  CacheData  = NULL;
> > +  RetryCount = 0;
> > +
> > +  //
> > +  // Search for cache list.
> > +  //
> > +  if (UseCache) {
> > +    CacheData = FindHttpCacheData (&mRedfishHttpCachePrivate-
> > >CacheList.Head, Uri);
> > +    if (CacheData != NULL) {
> > +      DEBUG ((REDFISH_HTTP_CACHE_DEBUG, "%a: cache hit! %s\n",
> > __func__, Uri));
> > +
> > +      //
> > +      // Copy cached response to caller's buffer.
> > +      //
> > +      Status               = CopyRedfishResponse (CacheData->Response, Response);
> > +      CacheData->HitCount += 1;
> > +      return Status;
> > +    }
> > +  }
> > +
> > +  AsciiUri = StringUnicodeToAscii (Uri);  if (AsciiUri == NULL) {
> > +    return EFI_OUT_OF_RESOURCES;
> > +  }
> > +
> > +  //
> > +  // Get resource from redfish service.
> > +  //
> > +  do {
> > +    RetryCount += 1;
> > +    Status      = RedfishGetByUri (
> > +                    Service,
> > +                    AsciiUri,
> > +                    Response
> > +                    );
> > +    if (!EFI_ERROR (Status) || (RetryCount >=
> > REDFISH_HTTP_GET_RETRY_MAX)) {
> > +      break;
> > +    }
> > +
> > +    //
> > +    // Retry when BMC is not ready.
> > +    //
> > +    if ((Response->StatusCode != NULL)) {
> > +      DEBUG_CODE (
> > +        DumpRedfishResponse (NULL, DEBUG_ERROR, Response);
> > +        );
> > +
> > +      if (*Response->StatusCode !=
> > HTTP_STATUS_500_INTERNAL_SERVER_ERROR) {
> > +        break;
> > +      }
> > +
> > +      FreePool (Response->StatusCode);
> > +      Response->StatusCode = NULL;
> > +    }
> > +
> > +    DEBUG ((DEBUG_WARN, "%a: RedfishGetByUri failed, retry
> > + (%d/%d)\n",
> > __func__, RetryCount, REDFISH_HTTP_GET_RETRY_MAX));
> > +    gBS->Stall (REDFISH_HTTP_RETRY_WAIT);  } while (TRUE);
> > +
> > +  if (EFI_ERROR (Status)) {
> > +    DEBUG ((DEBUG_ERROR, "%a: get %a failed (%d/%d): %r\n", __func__,
> > AsciiUri, RetryCount, REDFISH_HTTP_GET_RETRY_MAX, Status));
> > +    if (Response->Payload != NULL) {
> > +      RedfishFreeResponse (
> > +        NULL,
> > +        0,
> > +        NULL,
> > +        Response->Payload
> > +        );
> > +      Response->Payload = NULL;
> > +    }
> > +
> > +    goto ON_RELEASE;
> > +  }
> > +
> > +  //
> > +  // Keep response in cache list
> > +  //
> > +  Status = AddHttpCacheData (&mRedfishHttpCachePrivate->CacheList,
> > + Uri,
> > Response);
> > +  if (EFI_ERROR (Status)) {
> > +    DEBUG ((DEBUG_ERROR, "%a: failed to cache %s: %r\n", __func__,
> > + Uri,
> > Status));
> > +    goto ON_RELEASE;
> > +  }
> > +
> > +  DEBUG_CODE (
> > +    DumpHttpCacheList (__func__, REDFISH_HTTP_CACHE_DEBUG_DUMP,
> > &mRedfishHttpCachePrivate->CacheList);
> > +    );
> > +
> > +ON_RELEASE:
> > +
> > +  if (AsciiUri != NULL) {
> > +    FreePool (AsciiUri);
> > +  }
> > +
> > +  return Status;
> > +}
> > +
> > +/**
> > +  Reset the cached data specified by given URI. When response data
> > +  returned by RedfishHttpResetResource() is modified, the response
> > +  data can not be used by other caller. Application calls this
> > +  function to make this data to be stale data and
> > +  RedfishHttpResetResource() will get latest data from remote server
> > +  again.
> > +
> > +  @param[in]  Uri           Target resource URI.
> > +
> > +  @retval     EFI_SUCCESS     Resrouce is reset successfully.
> > +  @retval     Others          Errors occur.
> > +
> > +**/
> > +EFI_STATUS
> > +RedfishHttpResetResource (
> > +  IN  EFI_STRING  Uri
> > +  )
> > +{
> > +  REDFISH_HTTP_CACHE_DATA  *CacheData;
> > +
> > +  if (IS_EMPTY_STRING (Uri)) {
> > +    return EFI_INVALID_PARAMETER;
> > +  }
> > +
> > +  if (mRedfishHttpCachePrivate == NULL) {
> > +    return EFI_NOT_READY;
> > +  }
> > +
> > +  CacheData = FindHttpCacheData (&mRedfishHttpCachePrivate-
> > >CacheList.Head, Uri);
> > +  if (CacheData == NULL) {
> > +    return EFI_NOT_FOUND;
> > +  }
> > +
> > +  DeleteHttpCacheData (&mRedfishHttpCachePrivate->CacheList,
> > + CacheData);
> > +
> > +  return EFI_SUCCESS;
> > +}
> > +
> > +/**
> > +
> > +  Initial HTTP cache library instance.
> > +
> > +  @param[in] ImageHandle     The image handle.
> > +  @param[in] SystemTable     The system table.
> > +
> > +  @retval  EFI_SUCCESS  Initial library successfully.
> > +  @retval  Other        Return error status.
> > +
> > +**/
> > +EFI_STATUS
> > +EFIAPI
> > +RedfishHttpCacheConstructor (
> > +  IN EFI_HANDLE        ImageHandle,
> > +  IN EFI_SYSTEM_TABLE  *SystemTable
> > +  )
> > +{
> > +  mRedfishHttpCachePrivate = AllocateZeroPool (sizeof
> > (REDFISH_HTTP_CACHE_PRIVATE));
> > +  if (mRedfishHttpCachePrivate == NULL) {
> > +    return EFI_OUT_OF_RESOURCES;
> > +  }
> > +
> > +  //
> > +  // Initial cache list
> > +  //
> > +  mRedfishHttpCachePrivate->CacheList.Capacity =
> > REDFISH_HTTP_CACHE_LIST_SIZE;
> > +  mRedfishHttpCachePrivate->CacheList.Count    = 0x00;
> > +  InitializeListHead (&mRedfishHttpCachePrivate->CacheList.Head);
> > +
> > +  return EFI_SUCCESS;
> > +}
> > +
> > +/**
> > +  Release allocated resource.
> > +
> > +  @param[in] ImageHandle       Handle that identifies the image to be
> > unloaded.
> > +  @param[in] SystemTable      The system table.
> > +
> > +  @retval EFI_SUCCESS      The image has been unloaded.
> > +
> > +**/
> > +EFI_STATUS
> > +EFIAPI
> > +RedfishHttpCacheDestructor (
> > +  IN EFI_HANDLE        ImageHandle,
> > +  IN EFI_SYSTEM_TABLE  *SystemTable
> > +  )
> > +{
> > +  if (mRedfishHttpCachePrivate != NULL) {
> > +    if (!IsListEmpty (&mRedfishHttpCachePrivate->CacheList.Head)) {
> > +      ReleaseCacheList (&mRedfishHttpCachePrivate->CacheList);
> > +    }
> > +
> > +    FreePool (mRedfishHttpCachePrivate);
> > +    mRedfishHttpCachePrivate = NULL;
> > +  }
> > +
> > +  return EFI_SUCCESS;
> > +}
> > --
> > 2.34.1
> 
> 
> 
> 
> 



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