YugabyteDB (2.13.1.0-b60, 21121d69985fbf76aa6958d8f04a9bfa936293b5)

// Copyright (c) YugaByte, Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except

// in compliance with the License.  You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software distributed under the License

// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

// or implied.  See the License for the specific language governing permissions and limitations

// under the License.

#include "yb/client/async_initializer.h"

#include "yb/client/client.h"

#include "yb/common/common_net.pb.h"

#include "yb/common/wire_protocol.h"

#include "yb/gutil/strings/join.h"

#include "yb/util/flag_tags.h"

#include "yb/util/thread.h"

using namespace std::literals;

DEFINE_test_flag(bool, force_master_leader_resolution, false,

                 "Force master leader resolution even only one master is set.");

namespace yb {

namespace client {

AsyncClientInitialiser::AsyncClientInitialiser(

    const std::string& client_name, const uint32_t num_reactors, const uint32_t timeout_seconds,

    const std::string& tserver_uuid, const yb::server::ServerBaseOptions* opts,

    scoped_refptr<MetricEntity> metric_entity,

    const std::shared_ptr<MemTracker>& parent_mem_tracker,

    rpc::Messenger* messenger)

    : client_builder_(std::make_unique<YBClientBuilder>()), messenger_(messenger),

      client_future_(client_promise_.get_future()) {

  client_builder_->set_client_name(client_name);

  client_builder_->default_rpc_timeout(MonoDelta::FromSeconds(timeout_seconds));

  // Client does not care about master replication factor, it only needs endpoint of master leader.

  // So we put all known master addresses to speed up leader resolution.

  std::vector<std::string> master_addresses;

  for (const auto& list : *opts->GetMasterAddresses()) {

    for (const auto& hp : list) {

      master_addresses.push_back(hp.ToString());

    }

  }

  VLOG
(4) << "Master addresses for " << client_name << ": " << AsString(master_addresses)0
;

  client_builder_->add_master_server_addr(JoinStrings(master_addresses, ","));

  client_builder_->set_skip_master_leader_resolution(

      master_addresses.size() == 1 && 
!FLAGS_TEST_force_master_leader_resolution3.64k
);

  client_builder_->set_metric_entity(metric_entity);

  if (num_reactors > 0) {

    client_builder_->set_num_reactors(num_reactors);

  }

  client_builder_->set_parent_mem_tracker(parent_mem_tracker);

  // Build cloud_info_pb.

  client_builder_->set_cloud_info_pb(opts->MakeCloudInfoPB());

  if (!tserver_uuid.empty()) {

    client_builder_->set_tserver_uuid(tserver_uuid);

  }

}

AsyncClientInitialiser::~AsyncClientInitialiser() {

  Shutdown();

  if (init_client_thread_.joinable()) {

    init_client_thread_.join();

  }

}

void AsyncClientInitialiser::Start() {

  init_client_thread_ = std::thread(std::bind(&AsyncClientInitialiser::InitClient, this));

}

YBClient* AsyncClientInitialiser::client() const {

  return client_future_.get();

}

void AsyncClientInitialiser::InitClient() {

  CDSAttacher attacher;

  LOG(INFO) << "Starting to init ybclient";

  while (!stopping_) {

    auto result = client_builder_->Build(messenger_);

    if (result.ok()) {

      LOG(INFO) << "Successfully built ybclient";

      client_holder_.reset(result->release());

      for (const auto& functor : post_create_hooks_) {

        functor(client_holder_.get());

      }

      client_promise_.set_value(client_holder_.get());

      return;

    }

    LOG(ERROR) << "Failed to initialize client: " << result.status();

    if (result.status().IsAborted()) {

      break;

    }

    std::this_thread::sleep_for(1s);

  }

  client_promise_.set_value(nullptr);

}

}  // namespace client

}  // namespace yb