dym sdk: refactor the cpp sdk to use std (#43791)

Commit Message: dym sdk: refactor the cpp sdk to use std
Additional Description:

Rather than absl, to use std in the cpp dynamic module SDK.

Risk Level:
Testing:
Docs Changes:
Release Notes:
Platform Specific Features:
[Optional Runtime guard:]
[Optional Fixes #Issue]
[Optional Fixes commit #PR or SHA]
[Optional Deprecated:]
[Optional [API
Considerations](https://github.com/envoyproxy/envoy/blob/main/api/review_checklist.md):]

---------

Signed-off-by: wbpcode/wangbaiping <wbphub@gmail.com>

Author: wbpcode

source/extensions/dynamic_modules/sdk/cpp/BUILD

@@ -8,12 +8,6 @@ cc_library(
     srcs = ["sdk.cc"],
     hdrs = ["sdk.h"],
     visibility = ["//visibility:public"],
-    deps = [
-        "@com_google_absl//absl/container:flat_hash_map",
-        "@com_google_absl//absl/strings:string_view",
-        "@com_google_absl//absl/types:optional",
-        "@com_google_absl//absl/types:span",
-    ],
     alwayslink = True,
 )
 
@@ -30,8 +24,6 @@ cc_library(
     deps = [
         ":sdk",
         "//source/extensions/dynamic_modules/abi",
-        "@com_google_absl//absl/container:flat_hash_map",
-        "@com_google_absl//absl/synchronization",
     ],
     alwayslink = True,
 )

source/extensions/dynamic_modules/sdk/cpp/sdk.cc

@@ -1,5 +1,9 @@
 #include "sdk.h"
 
+#include <format>
+#include <iostream>
+#include <string_view>
+
 namespace Envoy {
 namespace DynamicModules {
 
@@ -70,10 +74,13 @@ std::string readWholeResponseBody(HttpFilterHandle& handle) {
 }
 } // namespace Utility
 
-HttpFilterConfigFactoryRegister::HttpFilterConfigFactoryRegister(absl::string_view name,
+HttpFilterConfigFactoryRegister::HttpFilterConfigFactoryRegister(std::string_view name,
                                                                  HttpFilterConfigFactoryPtr factory)
     : name_(name) {
-  auto r = HttpFilterConfigFactoryRegistry::getMutableRegistry().emplace(name_, std::move(factory));
+  // The register will have longer lifetime than the related factory entry in the registry,
+  // so it's safe to store the name as string_view in the registry.
+  auto r = HttpFilterConfigFactoryRegistry::getMutableRegistry().emplace(std::string_view(name_),
+                                                                         std::move(factory));
   if (!r.second) {
     std::string error_msg = std::format("Factory with the same name {} already registered", name_);
     std::cerr << error_msg << std::endl;
@@ -85,13 +92,13 @@ HttpFilterConfigFactoryRegister::~HttpFilterConfigFactoryRegister() {
   HttpFilterConfigFactoryRegistry::getMutableRegistry().erase(name_);
 }
 
-absl::flat_hash_map<std::string, HttpFilterConfigFactoryPtr>&
+std::map<std::string_view, HttpFilterConfigFactoryPtr>&
 HttpFilterConfigFactoryRegistry::getMutableRegistry() {
-  static absl::flat_hash_map<std::string, HttpFilterConfigFactoryPtr> registry;
+  static std::map<std::string_view, HttpFilterConfigFactoryPtr> registry;
   return registry;
 }
 
-const absl::flat_hash_map<std::string, HttpFilterConfigFactoryPtr>&
+const std::map<std::string_view, HttpFilterConfigFactoryPtr>&
 HttpFilterConfigFactoryRegistry::getRegistry() {
   return getMutableRegistry();
 };