chore: Add support for persistent store contract tests.

.github/actions/ci/action.yml

@@ -37,6 +37,10 @@ inputs:
     description: 'Whether to install CURL development libraries. Required for OpenTelemetry builds (server-sdk-otel), but does not enable CURL networking for the SDK itself.'
     required: false
     default: 'false'
+  use_redis:
+    description: 'Whether to enable Redis support (LD_BUILD_REDIS_SUPPORT=ON)'
+    required: false
+    default: 'false'
 
 runs:
   using: composite
@@ -58,7 +62,7 @@ runs:
       id: install-curl
     - name: Build Library
       shell: bash
-      run: ./scripts/build.sh ${{ inputs.cmake_target }} ON ${{ inputs.use_curl }}
+      run: ./scripts/build.sh ${{ inputs.cmake_target }} ON ${{ inputs.use_curl }} ${{ inputs.use_redis }}
       env:
         BOOST_ROOT: ${{ steps.install-boost.outputs.BOOST_ROOT }}
         Boost_DIR: ${{ steps.install-boost.outputs.Boost_DIR }}
@@ -69,7 +73,7 @@ runs:
       id: build-tests
       if: inputs.run_tests == 'true'
       shell: bash
-      run: ./scripts/build.sh gtest_${{ inputs.cmake_target }} ON ${{ inputs.use_curl }}
+      run: ./scripts/build.sh gtest_${{ inputs.cmake_target }} ON ${{ inputs.use_curl }} ${{ inputs.use_redis }}
       env:
         BOOST_ROOT: ${{ steps.install-boost.outputs.BOOST_ROOT }}
         Boost_DIR: ${{ steps.install-boost.outputs.Boost_DIR }}

.github/workflows/server-redis.yml

@@ -28,6 +28,7 @@ jobs:
         with:
           cmake_target: launchdarkly-cpp-server-redis-source
           simulate_release: true
+          use_redis: true
   build-redis-mac:
     runs-on: macos-15
     steps:
@@ -39,6 +40,7 @@ jobs:
           platform_version: 12
           run_tests: false # TODO: figure out how to run Redis service on Mac
           simulate_release: true
+          use_redis: true
   build-test-redis-windows:
     runs-on: windows-2022
     steps:
@@ -57,3 +59,4 @@ jobs:
           toolset: msvc
           run_tests: false # TODO: figure out how to run Redis service on Windows
           simulate_windows_release: true
+          use_redis: true

.github/workflows/server.yml

@@ -27,6 +27,7 @@ jobs:
         with:
           cmake_target: server-tests
           run_tests: false
+          use_redis: true
       - name: 'Launch test service as background task'
         run: $TEST_SERVICE_BINARY $TEST_SERVICE_PORT 2>&1 &
       # https://github.com/launchdarkly/gh-actions/releases/tag/contract-tests-v1.1.0
@@ -35,6 +36,7 @@ jobs:
           # Inform the test harness of test service's port.
           test_service_port: ${{ env.TEST_SERVICE_PORT }}
           token: ${{ secrets.GITHUB_TOKEN }}
+          enable_persistence_tests: true
 
   contract-tests-curl:
     runs-on: ubuntu-22.04
@@ -50,6 +52,7 @@ jobs:
           cmake_target: server-tests
           run_tests: false
           use_curl: true
+          use_redis: true
       - name: 'Launch test service as background task'
         run: $TEST_SERVICE_BINARY $TEST_SERVICE_PORT 2>&1 &
       # https://github.com/launchdarkly/gh-actions/releases/tag/contract-tests-v1.1.0
@@ -58,6 +61,7 @@ jobs:
           # Inform the test harness of test service's port.
           test_service_port: ${{ env.TEST_SERVICE_PORT }}
           token: ${{ secrets.GITHUB_TOKEN }}
+          enable_persistence_tests: true
 
   build-test-server:
     runs-on: ubuntu-22.04

contract-tests/data-model/include/data_model/data_model.hpp

@@ -1,3 +1,3 @@
 #pragma once
 
 #include <optional>
@@ -150,6 +150,34 @@
 
 NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(ConfigWrapper, name, version);
 
+struct ConfigPersistentCache {
+    std::string mode;  // "off", "ttl", "infinite"
+    std::optional<int> ttlMs;
+};
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(ConfigPersistentCache,
+                                                mode,
+                                                ttlMs);
+
+struct ConfigPersistentStore {
+    std::string type;  // "redis", "consul", "dynamodb"
+    std::string dsn;
+    std::optional<std::string> prefix;
+};
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(ConfigPersistentStore,
+                                                type,
+                                                dsn,
+                                                prefix);
+
+struct ConfigPersistentDataStore {
+    ConfigPersistentStore store;
+    ConfigPersistentCache cache;
+};
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(ConfigPersistentDataStore,
+                                                store,
+                                                cache);
 struct ConfigParams {
     std::string credential;
     std::optional<uint32_t> startWaitTimeMs;
@@ -164,6 +192,7 @@
     std::optional<ConfigProxyParams> proxy;
     std::optional<ConfigHooksParams> hooks;
     std::optional<ConfigWrapper> wrapper;
+    std::optional<ConfigPersistentDataStore> persistentDataStore;
 };
 
 NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(ConfigParams,
@@ -179,7 +208,8 @@
                                                 tls,
                                                 proxy,
                                                 hooks,
-                                                wrapper);
+                                                wrapper,
+                                                persistentDataStore);
 
 struct ContextSingleParams {
     std::optional<std::string> kind;

contract-tests/server-contract-tests/CMakeLists.txt

@@ -28,4 +28,9 @@ target_link_libraries(server-tests PRIVATE
         contract-test-data-model
         )
 
+if (LD_BUILD_REDIS_SUPPORT)
+    target_link_libraries(server-tests PRIVATE launchdarkly::server_redis_source)
+    target_compile_definitions(server-tests PRIVATE LD_REDIS_SUPPORT_ENABLED)
+endif ()
+
 target_include_directories(server-tests PUBLIC include)

contract-tests/server-contract-tests/src/entity_manager.cpp

@@ -1,3 +1,3 @@
 #include "entity_manager.hpp"
 #include "contract_test_hook.hpp"
 
@@ -7,6 +7,10 @@
 
 #include <boost/json.hpp>
 
+#ifdef LD_REDIS_SUPPORT_ENABLED
+#include <launchdarkly/server_side/integrations/redis/redis_source.hpp>
+#endif
+
 using launchdarkly::LogLevel;
 using namespace launchdarkly::server_side;
 
@@ -154,6 +158,56 @@
         }
     }
 
+#ifdef LD_REDIS_SUPPORT_ENABLED
+    if (in.persistentDataStore) {
+        if (in.persistentDataStore->store.type == "redis") {
+            std::string prefix =
+                in.persistentDataStore->store.prefix.value_or("launchdarkly");
+
+            auto redis_result = launchdarkly::server_side::integrations::
+                RedisDataSource::Create(in.persistentDataStore->store.dsn,
+                                        prefix);
+
+            if (!redis_result) {
+                LD_LOG(logger_, LogLevel::kWarn)
+                    << "entity_manager: couldn't create Redis data source: "
+                    << redis_result.error();
+                return std::nullopt;
+            }
+
+            auto lazy_load = config::builders::LazyLoadBuilder();
+            lazy_load.Source(std::move(*redis_result));
+
+            // Configure cache mode
+            // Default is 5 minutes, but contract tests may specify:
+            // - "off": disable caching (fetch from DB every time)
+            // - "ttl": custom TTL in milliseconds
+            // - "infinite": never expire cached items
+            if (in.persistentDataStore->cache.mode == "off") {
+                lazy_load.CacheRefresh(std::chrono::seconds(0));
+            } else if (in.persistentDataStore->cache.mode == "ttl") {
+                if (in.persistentDataStore->cache.ttlMs) {
+                    lazy_load.CacheRefresh(std::chrono::milliseconds(
+                        *in.persistentDataStore->cache.ttlMs));
+                }
+            } else if (in.persistentDataStore->cache.mode == "infinite") {
+                // Use a very large TTL to effectively never expire
+                lazy_load.CacheRefresh(std::chrono::hours(24 * 365));
+            }
+            // If no mode specified, the default 5-minute TTL is used
+
+            config_builder.DataSystem().Method(
+                config::builders::DataSystemBuilder::LazyLoad(
+                    std::move(lazy_load)));
+        } else {
+            LD_LOG(logger_, LogLevel::kWarn)
+                << "entity_manager: unsupported persistent store type: "
+                << in.persistentDataStore->store.type;
+            return std::nullopt;
+        }
+    }
+#endif
+
     auto config = config_builder.Build();
     if (!config) {
         LD_LOG(logger_, LogLevel::kWarn)

contract-tests/server-contract-tests/src/main.cpp

@@ -51,6 +51,9 @@ int main(int argc, char* argv[]) {
         srv.add_capability("evaluation-hooks");
         srv.add_capability("track-hooks");
         srv.add_capability("wrapper");
+#ifdef LD_REDIS_SUPPORT_ENABLED
+        srv.add_capability("persistent-data-store-redis");
+#endif
 
         net::signal_set signals{ioc, SIGINT, SIGTERM};
 

scripts/build.sh

@@ -7,6 +7,7 @@
 # $1 the name of the target. For example "launchdarkly-cpp-common".
 # $2 ON/OFF which enables/disables building in a test configuration (unit tests + contract tests.)
 # $3 (optional) true/false to enable/disable CURL networking (LD_CURL_NETWORKING)
+# $4 (optional) true/false to enable/disable Redis support (LD_BUILD_REDIS_SUPPORT)
 
 function cleanup {
   cd ..
@@ -31,6 +32,13 @@ if [ "$3" == "true" ]; then
   build_curl="ON"
 fi
 
+# Check for Redis support option (override the automatic detection if explicitly passed)
+if [ "$4" == "true" ]; then
+  build_redis="ON"
+elif [ "$4" == "false" ]; then
+  build_redis="OFF"
+fi
+
 # Set build type to Debug when testing is enabled
 build_type="Release"
 if [ "$2" == "ON" ]; then