feat etcd: Init etcd client

.mapping.json

@@ -185,7 +185,7 @@
   "chaotic/include/userver/chaotic/dynamic_config_variable_bundle.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/dynamic_config_variable_bundle.hpp",
   "chaotic/include/userver/chaotic/exception.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/exception.hpp",
   "chaotic/include/userver/chaotic/io/boost/uuids/uuid.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/io/boost/uuids/uuid.hpp",
-  "chaotic/include/userver/chaotic/io/crypto/base64/string64.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/io/crypto/base64/string64.hpp",
+  "chaotic/include/userver/chaotic/io/userver/crypto/base64/string64.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/io/crypto/base64/string64.hpp",
   "chaotic/include/userver/chaotic/io/decimal64/decimal.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/io/decimal64/decimal.hpp",
   "chaotic/include/userver/chaotic/io/std/chrono/days.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/io/std/chrono/days.hpp",
   "chaotic/include/userver/chaotic/io/std/chrono/duration.hpp":"taxi/uservices/userver/chaotic/include/userver/chaotic/io/std/chrono/duration.hpp",

CMakeLists.txt

@@ -146,6 +146,7 @@ option(USERVER_FEATURE_MYSQL "Provide asynchronous driver for MariaDB/MySQL" "${
 option(USERVER_FEATURE_ROCKS "Provide asynchronous driver for Rocks" "${USERVER_LIB_ENABLED_DEFAULT}")
 option(USERVER_FEATURE_YDB "Provide asynchronous driver for YDB" "${USERVER_YDB_DEFAULT}")
 option(USERVER_FEATURE_OTLP "Provide asynchronous OTLP exporters" "${USERVER_LIB_ENABLED_DEFAULT}")
+option(USERVER_FEATURE_ETCD "Provide asynchronous driver for etcd" "${USERVER_LIB_ENABLED_DEFAULT}")
 
 set(CMAKE_DEBUG_POSTFIX d)
 
@@ -298,6 +299,11 @@ if (USERVER_FEATURE_YDB)
   list(APPEND USERVER_AVAILABLE_COMPONENTS ydb)
 endif()
 
+if (USERVER_FEATURE_ETCD)
+  _require_userver_core("USERVER_FEATURE_ETCD")
+  add_subdirectory(etcd)
+endif()
+
 add_subdirectory(libraries)
 
 if (USERVER_BUILD_TESTS)

chaotic/chaotic/back/cpp/translator.py

@@ -444,7 +444,7 @@ def _gen_string(
 
         if schema.format:
             if schema.format == types.StringFormat.BYTE:
-                format_cpp_type = 'crypto::base64::String64'
+                format_cpp_type = 'userver::crypto::base64::String64'
             elif schema.format == types.StringFormat.UUID:
                 format_cpp_type = 'boost::uuids::uuid'
             elif schema.format == types.StringFormat.DATE:

chaotic/include/userver/chaotic/io/crypto/base64/string64.hpp → chaotic/include/userver/chaotic/io/userver/crypto/base64/string64.hpp

@@ -5,6 +5,8 @@
 
 #include <string>
 
+USERVER_NAMESPACE_BEGIN
+
 namespace crypto::base64 {
 
 // RFC4648
@@ -14,8 +16,6 @@ class String64 : public USERVER_NAMESPACE::utils::StrongTypedef<String64, std::s
 
 }  // namespace crypto::base64
 
-USERVER_NAMESPACE_BEGIN
-
 namespace chaotic::convert {
 
 crypto::base64::String64 Convert(const std::string& str, chaotic::convert::To<crypto::base64::String64>);

chaotic/src/chaotic/io/crypto/base64/string64.cpp

@@ -1,16 +1,16 @@
-#include <userver/chaotic/io/crypto/base64/string64.hpp>
+#include <userver/chaotic/io/userver/crypto/base64/string64.hpp>
 
 #include <userver/crypto/base64.hpp>
 
 USERVER_NAMESPACE_BEGIN
 
 namespace chaotic::convert {
 
-::crypto::base64::String64 Convert(const std::string& str, chaotic::convert::To<::crypto::base64::String64>) {
-    return ::crypto::base64::String64(crypto::base64::Base64Decode(str));
+crypto::base64::String64 Convert(const std::string& str, chaotic::convert::To<crypto::base64::String64>) {
+    return crypto::base64::String64(crypto::base64::Base64Decode(str));
 }
 
-std::string Convert(const ::crypto::base64::String64& str64, chaotic::convert::To<std::string>) {
+std::string Convert(const crypto::base64::String64& str64, chaotic::convert::To<std::string>) {
     return crypto::base64::Base64Encode(str64.GetUnderlying());
 }
 

chaotic/src/chaotic/io/userver/crypto/base64/string64.cpp

@@ -0,0 +1,19 @@
+#include <userver/chaotic/io/userver/crypto/base64/string64.hpp>
+
+#include <userver/crypto/base64.hpp>
+
+USERVER_NAMESPACE_BEGIN
+
+namespace chaotic::convert {
+
+crypto::base64::String64 Convert(const std::string& str, chaotic::convert::To<crypto::base64::String64>) {
+    return crypto::base64::String64(crypto::base64::Base64Decode(str));
+}
+
+std::string Convert(const crypto::base64::String64& str64, chaotic::convert::To<std::string>) {
+    return crypto::base64::Base64Encode(str64.GetUnderlying());
+}
+
+}  // namespace chaotic::convert
+
+USERVER_NAMESPACE_END

chaotic/tests/back/cpp/test_tr_string.py

@@ -54,7 +54,7 @@ def test_byte(simple_gen):
     assert types == {
         '::type': cpp_types.CppStringWithFormat(
             raw_cpp_type=type_name.TypeName('std::string'),
-            format_cpp_type='crypto::base64::String64',
+            format_cpp_type='userver::crypto::base64::String64',
             user_cpp_type=None,
             json_schema=None,
             nullable=False,

cmake/install/userver-etcd-config.cmake

@@ -0,0 +1,11 @@
+include_guard(GLOBAL)
+
+if(userver_etcd_FOUND)
+  return()
+endif()
+
+find_package(userver REQUIRED COMPONENTS
+  core
+)
+
+set(userver_etcd_FOUND TRUE)

etcd/CMakeLists.txt

@@ -0,0 +1,24 @@
+project(userver-etcd CXX)
+
+file(GLOB_RECURSE SCHEMAS ${CMAKE_CURRENT_SOURCE_DIR}/schemas/*.yaml)
+userver_target_generate_chaotic(${PROJECT_NAME}-chgen
+    GENERATE_SERIALIZERS
+    LAYOUT
+        "/components/schemas/([^/]*)/=etcd_schemas::{0}"
+    OUTPUT_DIR
+        ${CMAKE_CURRENT_BINARY_DIR}/src
+    SCHEMAS
+        ${SCHEMAS}
+    RELATIVE_TO
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+userver_module(etcd
+    SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
+    UTEST_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/src/*_test.cpp"
+    LINK_LIBRARIES ${PROJECT_NAME}-chgen
+)
+
+if (USERVER_BUILD_TESTS)
+  add_subdirectory(functional_tests)
+endif()

etcd/functional_tests/CMakeLists.txt

@@ -0,0 +1,6 @@
+project(userver-etcd-tests CXX)
+
+add_custom_target(${PROJECT_NAME})
+
+add_subdirectory(client)
+add_dependencies(${PROJECT_NAME} ${PROJECT_NAME}-client)

etcd/functional_tests/client/CMakeLists.txt

@@ -0,0 +1,6 @@
+project(userver-etcd-tests-client CXX)
+
+add_executable(${PROJECT_NAME} "etcd_service.cpp")
+target_link_libraries(${PROJECT_NAME} userver-core userver-etcd)
+
+userver_chaos_testsuite_add()

etcd/functional_tests/client/etcd_service.cpp

@@ -0,0 +1,92 @@
+#include <userver/utest/using_namespace_userver.hpp>
+
+#include <fmt/format.h>
+
+#include <userver/clients/dns/component.hpp>
+#include <userver/clients/http/component.hpp>
+#include <userver/components/component_list.hpp>
+#include <userver/components/minimal_server_component_list.hpp>
+#include <userver/etcd/component.hpp>
+#include <userver/server/handlers/http_handler_base.hpp>
+#include <userver/server/handlers/ping.hpp>
+#include <userver/server/handlers/tests_control.hpp>
+#include <userver/testsuite/testsuite_support.hpp>
+#include <userver/utils/daemon_run.hpp>
+
+namespace {
+
+class HandlerV1Get final : public server::handlers::HttpHandlerBase {
+public:
+    static constexpr std::string_view kName = "handler-v1-get";
+
+    HandlerV1Get(const components::ComponentConfig& config, const components::ComponentContext& component_context)
+        : HttpHandlerBase(config, component_context),
+          etcd_client_ptr_(component_context.FindComponent<etcd::Component>("etcd-client").GetClient()) {}
+
+    std::string HandleRequestThrow(const server::http::HttpRequest& request, server::request::RequestContext&)
+        const override {
+        const auto maybe_value = etcd_client_ptr_->Get(request.GetArg("key"));
+        return maybe_value.value_or("No value");
+    }
+
+private:
+    etcd::ClientPtr etcd_client_ptr_;
+};
+
+class HandlerV1Put final : public server::handlers::HttpHandlerBase {
+public:
+    static constexpr std::string_view kName = "handler-v1-put";
+
+    HandlerV1Put(const components::ComponentConfig& config, const components::ComponentContext& component_context)
+        : HttpHandlerBase(config, component_context),
+          etcd_client_ptr_(component_context.FindComponent<etcd::Component>("etcd-client").GetClient()) {}
+
+    std::string HandleRequestThrow(const server::http::HttpRequest& request, server::request::RequestContext&)
+        const override {
+        etcd_client_ptr_->Put(request.GetArg("key"), request.GetArg("value"));
+
+        return std::string();
+    }
+
+private:
+    etcd::ClientPtr etcd_client_ptr_;
+};
+
+class HandlerV1Watch final : public server::handlers::HttpHandlerBase {
+public:
+    static constexpr std::string_view kName = "handler-v1-watch";
+
+    HandlerV1Watch(const components::ComponentConfig& config, const components::ComponentContext& component_context)
+        : HttpHandlerBase(config, component_context),
+          etcd_client_ptr_(component_context.FindComponent<etcd::Component>("etcd-client").GetClient()) {}
+
+    std::string HandleRequestThrow(const server::http::HttpRequest& request, server::request::RequestContext&)
+        const override {
+        const auto key = request.GetArg("key");
+        const auto maybe_original_value = etcd_client_ptr_->Get(key);
+        auto watch_listener = etcd_client_ptr_->StartWatch(key);
+        const auto watch_event = watch_listener.GetEvent();
+        const auto new_value = watch_event.value;
+        return fmt::format("original value: {}, new value: {}", maybe_original_value.value_or("No value"), new_value);
+    }
+
+private:
+    etcd::ClientPtr etcd_client_ptr_;
+};
+
+}  // namespace
+
+int main(int argc, char* argv[]) {
+    auto component_list = components::MinimalServerComponentList()
+                              .Append<server::handlers::Ping>()
+                              .Append<components::TestsuiteSupport>()
+                              .Append<components::HttpClient>()
+                              .Append<clients::dns::Component>()
+                              .Append<etcd::Component>()
+                              .Append<server::handlers::TestsControl>()
+                              .Append<HandlerV1Get>()
+                              .Append<HandlerV1Put>()
+                              .Append<HandlerV1Watch>();
+
+    return utils::DaemonMain(argc, argv, component_list);
+}

etcd/functional_tests/client/static_config.yaml

@@ -0,0 +1,76 @@
+# yaml
+components_manager:
+    task_processors:
+        main-task-processor:
+            worker_threads: 4
+
+        fs-task-processor:
+            worker_threads: 1
+
+    default_task_processor: main-task-processor
+
+    components:
+        server:
+            listener:
+                port: 8080
+                task_processor: main-task-processor
+                connection:
+                    http-version: '2'
+                    http2-session:
+                        max_concurrent_streams: 100
+                        max_frame_size: 16384
+                        initial_window_size: 65536
+            listener-monitor:
+                port: 8081
+                task_processor: main-task-processor
+        logging:
+            fs-task-processor: fs-task-processor
+            loggers:
+                default:
+                    file_path: '@stderr'
+                    level: error
+                    overflow_behavior: discard
+
+        http-client:
+            fs-task-processor: fs-task-processor
+            user-agent: $server-name
+            user-agent#fallback: 'userver-based-service 1.0'
+        dns-client:
+            fs-task-processor: fs-task-processor
+        testsuite-support:
+        tests-control:
+            path: /tests/{action}
+            method: POST
+            task_processor: main-task-processor
+            testpoint-timeout: 10s
+            testpoint-url: $mockserver/testpoint
+            throttling_enabled: false
+
+        handler-ping:
+            path: /ping
+            method: GET
+            task_processor: main-task-processor
+            throttling_enabled: false
+            url_trailing_slash: strict-match
+
+        etcd-client:
+            endpoints:
+              - http://localhost:2379
+            attempts: 2
+            request_timeout_ms: 500
+            watch_timeout_ms: 1000000
+
+        handler-v1-get:
+            path: /v1/get
+            method: POST
+            task_processor: main-task-processor
+
+        handler-v1-put:
+            path: /v1/put
+            method: PUT
+            task_processor: main-task-processor
+
+        handler-v1-watch:
+            path: /v1/watch
+            method: POST
+            task_processor: main-task-processor