folly/wangle/bootstrap/ServerBootstrap-inl.h

   1 /*
   2  * Copyright 2015 Facebook, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *   http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #pragma once
  17
  18 #include <folly/wangle/acceptor/Acceptor.h>
  19 #include <folly/io/async/EventBaseManager.h>
  20 #include <folly/wangle/concurrent/IOThreadPoolExecutor.h>
  21 #include <folly/wangle/acceptor/ManagedConnection.h>
  22 #include <folly/wangle/channel/ChannelPipeline.h>
  23
  24 namespace folly {
  25
  26 template <typename Pipeline>
  27 class ServerAcceptor : public Acceptor {
  28   typedef std::unique_ptr<Pipeline,
  29                           folly::DelayedDestruction::Destructor> PipelinePtr;
  30
  31   class ServerConnection : public wangle::ManagedConnection {
  32    public:
  33     explicit ServerConnection(PipelinePtr pipeline)
  34         : pipeline_(std::move(pipeline)) {}
  35
  36     ~ServerConnection() {
  37     }
  38
  39     void timeoutExpired() noexcept {
  40     }
  41
  42     void describe(std::ostream& os) const {}
  43     bool isBusy() const {
  44       return false;
  45     }
  46     void notifyPendingShutdown() {}
  47     void closeWhenIdle() {}
  48     void dropConnection() {}
  49     void dumpConnectionState(uint8_t loglevel) {}
  50    private:
  51     PipelinePtr pipeline_;
  52   };
  53
  54  public:
  55   explicit ServerAcceptor(
  56     std::shared_ptr<PipelineFactory<Pipeline>> pipelineFactory,
  57     EventBase* base)
  58       : Acceptor(ServerSocketConfig())
  59       , pipelineFactory_(pipelineFactory) {
  60     Acceptor::init(nullptr, base);
  61   }
  62
  63   /* See Acceptor::onNewConnection for details */
  64   void onNewConnection(
  65     AsyncSocket::UniquePtr transport, const SocketAddress* address,
  66     const std::string& nextProtocolName, const TransportInfo& tinfo) {
  67
  68       std::unique_ptr<Pipeline,
  69                        folly::DelayedDestruction::Destructor>
  70       pipeline(pipelineFactory_->newPipeline(
  71         std::shared_ptr<AsyncSocket>(
  72           transport.release(),
  73           folly::DelayedDestruction::Destructor())));
  74     auto connection = new ServerConnection(std::move(pipeline));
  75     Acceptor::addConnection(connection);
  76   }
  77
  78  private:
  79   std::shared_ptr<PipelineFactory<Pipeline>> pipelineFactory_;
  80 };
  81
  82 template <typename Pipeline>
  83 class ServerAcceptorFactory : public AcceptorFactory {
  84  public:
  85   explicit ServerAcceptorFactory(
  86       std::shared_ptr<PipelineFactory<Pipeline>> factory)
  87     : factory_(factory) {}
  88
  89   std::shared_ptr<Acceptor> newAcceptor(folly::EventBase* base) {
  90     return std::make_shared<ServerAcceptor<Pipeline>>(factory_, base);
  91   }
  92  private:
  93   std::shared_ptr<PipelineFactory<Pipeline>> factory_;
  94 };
  95
  96 class ServerWorkerPool : public folly::wangle::ThreadPoolExecutor::Observer {
  97  public:
  98   explicit ServerWorkerPool(
  99     std::shared_ptr<AcceptorFactory> acceptorFactory,
 100     folly::wangle::IOThreadPoolExecutor* exec,
 101     std::vector<std::shared_ptr<folly::AsyncServerSocket>>* sockets)
 102       : acceptorFactory_(acceptorFactory)
 103       , exec_(exec)
 104       , sockets_(sockets) {
 105     CHECK(exec);
 106   }
 107
 108   template <typename F>
 109   void forEachWorker(F&& f) const;
 110
 111   void threadStarted(
 112     folly::wangle::ThreadPoolExecutor::ThreadHandle*);
 113   void threadStopped(
 114     folly::wangle::ThreadPoolExecutor::ThreadHandle*);
 115   void threadPreviouslyStarted(
 116       folly::wangle::ThreadPoolExecutor::ThreadHandle* thread) {
 117     threadStarted(thread);
 118   }
 119   void threadNotYetStopped(
 120       folly::wangle::ThreadPoolExecutor::ThreadHandle* thread) {
 121     threadStopped(thread);
 122   }
 123
 124  private:
 125   std::map<folly::wangle::ThreadPoolExecutor::ThreadHandle*,
 126            std::shared_ptr<Acceptor>> workers_;
 127   std::shared_ptr<AcceptorFactory> acceptorFactory_;
 128   folly::wangle::IOThreadPoolExecutor* exec_{nullptr};
 129   std::vector<std::shared_ptr<folly::AsyncServerSocket>>* sockets_;
 130 };
 131
 132 template <typename F>
 133 void ServerWorkerPool::forEachWorker(F&& f) const {
 134   for (const auto& kv : workers_) {
 135     f(kv.second.get());
 136   }
 137 }
 138
 139 } // namespace