feat: implement Client type

apps/hello-cpp/main.cpp

@@ -18,12 +18,6 @@ using launchdarkly::LogLevel;
 int main() {
     Logger logger(std::make_unique<ConsoleBackend>("Hello"));
 
-    if (auto num = launchdarkly::foo()) {
-        LD_LOG(logger, LogLevel::kInfo) << "Got: " << *num << '\n';
-    } else {
-        LD_LOG(logger, LogLevel::kInfo) << "Got nothing\n";
-    }
-
     net::io_context ioc;
 
     char const* key = std::getenv("STG_SDK_KEY");

bindings/c/src/api.cpp

@@ -1,10 +1,2 @@
 #include "launchdarkly/client_side/api.hpp"
 #include <launchdarkly/api.h>
-
-bool launchdarkly_foo(int32_t* out_result) {
-    if (auto val = launchdarkly::foo()) {
-        *out_result = *val;
-        return true;
-    }
-    return false;
-}

libs/client-sdk/include/launchdarkly/client_side/api.hpp

@@ -1,8 +1,56 @@
 #pragma once
 
-#include "cstdint"
-#include "optional"
+#include <boost/asio/io_context.hpp>
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <thread>
+#include <tl/expected.hpp>
+#include "config/client.hpp"
+#include "context.hpp"
+#include "error.hpp"
+#include "events/event_processor.hpp"
+#include "logger.hpp"
+#include "value.hpp"
 
-namespace launchdarkly {
-std::optional<std::int32_t> foo();
-}  // namespace launchdarkly
+namespace launchdarkly::client_side {
+class Client {
+   public:
+    Client(client::Config config, Context context);
+
+    using FlagKey = std::string;
+    [[nodiscard]] std::unordered_map<FlagKey, Value> AllFlags() const;
+
+    void Track(std::string event_name, Value data, double metric_value);
+
+    void Track(std::string event_name, Value data);
+
+    void Track(std::string event_name);
+
+    void AsyncFlush();
+
+    void AsyncIdentify(Context context);
+
+    bool BoolVariation(FlagKey const& key, bool default_value);
+
+    std::string StringVariation(FlagKey const& key, std::string default_value);
+
+    double DoubleVariation(FlagKey const& key, double default_value);
+
+    int IntVariation(FlagKey const& key, int default_value);
+
+    Value JsonVariation(FlagKey const& key, Value default_value);
+
+   private:
+    void TrackInternal(std::string event_name,
+                       std::optional<Value> data,
+                       std::optional<double> metric_value);
+
+    Logger logger_;
+    std::thread thread_;
+    boost::asio::io_context ioc_;
+    Context context_;
+    std::unique_ptr<events::IEventProcessor> event_processor_;
+};
+
+}  // namespace launchdarkly::client_side

libs/client-sdk/src/api.cpp

@@ -1,13 +1,78 @@
 #include "launchdarkly/client_side/api.hpp"
-
-#include <cstdint>
+#include <chrono>
 #include <optional>
+#include <utility>
+
+#include "console_backend.hpp"
+#include "events/client_events.hpp"
+#include "events/detail/asio_event_processor.hpp"
 
-namespace launchdarkly {
+namespace launchdarkly::client_side {
 
-auto const kAnswerToLifeTheUniverseAndEverything = 42;
+Client::Client(client::Config config, Context context)
+    : logger_(config.take_logger()),
+      context_(std::move(context)),
+      event_processor_(
+          std::make_unique<launchdarkly::events::detail::AsioEventProcessor>(
+              ioc_.get_executor(),
+              config.events_config(),
+              config.service_endpoints(),
+              config.sdk_key(),
+              logger_)) {}
+
+std::unordered_map<Client::FlagKey, Value> Client::AllFlags() const {
+    return {};
+}
 
-std::optional<std::int32_t> foo() {
-    return kAnswerToLifeTheUniverseAndEverything;
+void Client::TrackInternal(std::string event_name,
+                           std::optional<Value> data,
+                           std::optional<double> metric_value) {
+    event_processor_->AsyncSend(events::TrackEventParams{
+        std::chrono::system_clock::now(), std::move(event_name),
+        context_.kinds_to_keys(), std::move(data), metric_value});
 }
-}  // namespace launchdarkly
+
+void Client::Track(std::string event_name, Value data, double metric_value) {
+    this->TrackInternal(std::move(event_name), data, metric_value);
+}
+
+void Client::Track(std::string event_name, Value data) {
+    this->TrackInternal(std::move(event_name), data, std::nullopt);
+}
+
+void Client::Track(std::string event_name) {
+    this->TrackInternal(std::move(event_name), std::nullopt, std::nullopt);
+}
+
+void Client::AsyncFlush() {
+    event_processor_->AsyncFlush();
+}
+
+void Client::AsyncIdentify(Context context) {
+    event_processor_->AsyncSend(events::client::IdentifyEventParams{
+        std::chrono::system_clock::now(), std::move(context)});
+}
+
+bool Client::BoolVariation(Client::FlagKey const& key, bool default_value) {
+    return default_value;
+}
+
+std::string Client::StringVariation(Client::FlagKey const& key,
+                                    std::string default_value) {
+    return default_value;
+}
+
+double Client::DoubleVariation(Client::FlagKey const& key,
+                               double default_value) {
+    return default_value;
+}
+
+int Client::IntVariation(Client::FlagKey const& key, int default_value) {
+    return default_value;
+}
+
+Value Client::JsonVariation(Client::FlagKey const& key, Value default_value) {
+    return default_value;
+}
+
+}  // namespace launchdarkly::client_side

libs/client-sdk/tests/client_test.cpp

@@ -0,0 +1,18 @@
+#include <gtest/gtest.h>
+#include <launchdarkly/client_side/api.hpp>
+#include "context_builder.hpp"
+using namespace launchdarkly;
+
+TEST(ClientTest, ConstructClientWithConfig) {
+    tl::expected<client::Config, Error> config =
+        client::ConfigBuilder("sdk-123").build();
+
+    ASSERT_TRUE(config);
+
+    auto context = ContextBuilder().kind("cat", "shadow").build();
+
+    client_side::Client client(std::move(*config), context);
+
+    ASSERT_TRUE(client.AllFlags().empty());
+    ASSERT_TRUE(client.BoolVariation("cat-food", true));
+}

libs/common/include/config/client.hpp

@@ -9,6 +9,7 @@ namespace launchdarkly::client {
 
 using SDK = config::detail::ClientSDK;
 
+using Defaults = config::detail::Defaults<SDK>;
 using ApplicationInfo = config::detail::ApplicationInfo;
 using Endpoints = config::detail::EndpointsBuilder<SDK>;
 using ConfigBuilder = config::detail::ConfigBuilder<SDK>;

libs/common/include/config/detail/config.hpp

@@ -4,6 +4,7 @@
 #include "config/detail/endpoints_builder.hpp"
 #include "config/detail/events_builder.hpp"
 #include "config/detail/http_properties.hpp"
+#include "logger.hpp"
 
 namespace launchdarkly::config::detail {
 
@@ -14,20 +15,41 @@ namespace launchdarkly::config::detail {
  */
 template <typename SDK>
 struct Config {
-    std::string sdk_key;
-    bool offline;
-    detail::EndpointsBuilder<SDK> service_endpoints_builder;
-    std::optional<std::string> application_tag;
-    detail::EventsBuilder<SDK> events_builder;
-    DataSourceConfig<SDK> data_source_config;
-    detail::HttpProperties http_properties;
+   public:
     Config(std::string sdk_key,
            bool offline,
-           detail::EndpointsBuilder<SDK> service_endpoints_builder,
-           detail::EventsBuilder<SDK> events_builder,
+           launchdarkly::Logger logger,
+           ServiceEndpoints endpoints,
+           Events events,
            std::optional<std::string> application_tag,
            DataSourceConfig<SDK> data_source_config,
            detail::HttpProperties http_properties);
+
+    std::string const& sdk_key() const;
+
+    ServiceEndpoints const& service_endpoints() const;
+
+    Events const& events_config() const;
+
+    std::optional<std::string> const& application_tag() const;
+
+    DataSourceConfig<SDK> const& data_source_config() const;
+
+    HttpProperties const& http_properties() const;
+
+    bool offline() const;
+
+    Logger take_logger();
+
+   private:
+    std::string sdk_key_;
+    bool offline_;
+    launchdarkly::Logger logger_;
+    ServiceEndpoints service_endpoints_;
+    std::optional<std::string> application_tag_;
+    Events events_;
+    DataSourceConfig<SDK> data_source_config_;
+    detail::HttpProperties http_properties_;
 };
 
 }  // namespace launchdarkly::config::detail

libs/common/include/config/detail/config_builder.hpp

@@ -2,12 +2,14 @@
 
 #include <optional>
 #include <string>
+#include <tl/expected.hpp>
 #include "config/detail/application_info.hpp"
 #include "config/detail/config.hpp"
 #include "config/detail/data_source_builder.hpp"
 #include "config/detail/endpoints_builder.hpp"
 #include "config/detail/events_builder.hpp"
 #include "config/detail/http_properties_builder.hpp"
+
 #include "logger.hpp"
 
 namespace launchdarkly::config::detail {
@@ -22,15 +24,14 @@ class ConfigBuilder {
    public:
     using EndpointsBuilder = detail::EndpointsBuilder<SDK>;
     using EventsBuilder = detail::EventsBuilder<SDK>;
-    using ConfigType = detail::Config<SDK>;
+    using ConfigResult = tl::expected<detail::Config<SDK>, Error>;
     using DataSourceBuilder = detail::DataSourceBuilder<SDK>;
     using HttpPropertiesBuilder = detail::HttpPropertiesBuilder<SDK>;
     /**
      * A minimal configuration consists of a LaunchDarkly SDK Key.
      * @param sdk_key SDK Key.
      */
     ConfigBuilder(std::string sdk_key);
-
     /**
      * To customize the endpoints the SDK uses for streaming, polling, and
      * events, pass in an EndpointsBuilder.
@@ -83,7 +84,7 @@ class ConfigBuilder {
      * Builds a Configuration, suitable for passing into an instance of Client.
      * @return
      */
-    ConfigType build(Logger& logger) const;
+    ConfigResult build() const;
 
    private:
     std::string sdk_key_;

libs/common/include/config/detail/defaults.hpp

@@ -56,6 +56,8 @@ struct Defaults<ClientSDK> {
     static DataSourceConfig<ClientSDK> data_source_config() {
         return {Defaults<AnySDK>::streaming_config(), false, false};
     }
+
+    static bool offline() { return Defaults<AnySDK>::offline(); }
 };
 
 template <>
@@ -83,6 +85,8 @@ struct Defaults<ServerSDK> {
     static DataSourceConfig<ServerSDK> data_source_config() {
         return {Defaults<AnySDK>::streaming_config()};
     }
+
+    static bool offline() { return Defaults<AnySDK>::offline(); }
 };
 
 }  // namespace launchdarkly::config::detail

libs/common/include/config/detail/http_properties.hpp

@@ -29,4 +29,6 @@ class HttpProperties final {
     // TODO: Proxy.
 };
 
+bool operator==(HttpProperties const& lhs, HttpProperties const& rhs);
+
 }  // namespace launchdarkly::config::detail

libs/common/include/config/server.hpp

@@ -9,6 +9,7 @@ namespace launchdarkly::server {
 
 using SDK = config::detail::ServerSDK;
 
+using Defaults = config::detail::Defaults<SDK>;
 using ApplicationInfo = config::detail::ApplicationInfo;
 using Endpoints = config::detail::EndpointsBuilder<SDK>;
 using ConfigBuilder = config::detail::ConfigBuilder<SDK>;

libs/common/include/error.hpp

@@ -20,6 +20,8 @@ enum class Error : std::uint32_t {
 
     kConfig_Events_ZeroCapacity = 300,
 
+    kConfig_SDKKey_Empty = 400,
+
     /* Client-side errors: 10000-19999 */
     /* Server-side errors: 20000-29999 */