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/wangle/bootstrap/ServerSocketFactory.h>
  20 #include <folly/io/async/EventBaseManager.h>
  21 #include <folly/wangle/concurrent/IOThreadPoolExecutor.h>
  22 #include <folly/wangle/acceptor/ManagedConnection.h>
  23 #include <folly/wangle/channel/Pipeline.h>
  24 #include <folly/wangle/channel/Handler.h>
  25
  26 namespace folly {
  27
  28 template <typename Pipeline>
  29 class ServerAcceptor
  30     : public Acceptor
  31     , public folly::wangle::InboundHandler<void*> {
  32   typedef std::unique_ptr<Pipeline,
  33                           folly::DelayedDestruction::Destructor> PipelinePtr;
  34
  35   class ServerConnection : public wangle::ManagedConnection {
  36    public:
  37     explicit ServerConnection(PipelinePtr pipeline)
  38         : pipeline_(std::move(pipeline)) {}
  39
  40     ~ServerConnection() {
  41     }
  42
  43     void timeoutExpired() noexcept {
  44     }
  45
  46     void describe(std::ostream& os) const {}
  47     bool isBusy() const {
  48       return false;
  49     }
  50     void notifyPendingShutdown() {}
  51     void closeWhenIdle() {}
  52     void dropConnection() {
  53       delete this;
  54     }
  55     void dumpConnectionState(uint8_t loglevel) {}
  56    private:
  57     PipelinePtr pipeline_;
  58   };
  59
  60  public:
  61   explicit ServerAcceptor(
  62         std::shared_ptr<PipelineFactory<Pipeline>> pipelineFactory,
  63         std::shared_ptr<folly::wangle::Pipeline<void*>> acceptorPipeline,
  64         EventBase* base)
  65       : Acceptor(ServerSocketConfig())
  66       , base_(base)
  67       , childPipelineFactory_(pipelineFactory)
  68       , acceptorPipeline_(acceptorPipeline) {
  69     Acceptor::init(nullptr, base_);
  70     CHECK(acceptorPipeline_);
  71
  72     acceptorPipeline_->addBack(this);
  73     acceptorPipeline_->finalize();
  74   }
  75
  76   void read(Context* ctx, void* conn) {
  77     AsyncSocket::UniquePtr transport((AsyncSocket*)conn);
  78       std::unique_ptr<Pipeline,
  79                        folly::DelayedDestruction::Destructor>
  80       pipeline(childPipelineFactory_->newPipeline(
  81         std::shared_ptr<AsyncSocket>(
  82           transport.release(),
  83           folly::DelayedDestruction::Destructor())));
  84     auto connection = new ServerConnection(std::move(pipeline));
  85     Acceptor::addConnection(connection);
  86   }
  87
  88   /* See Acceptor::onNewConnection for details */
  89   void onNewConnection(
  90     AsyncSocket::UniquePtr transport, const SocketAddress* address,
  91     const std::string& nextProtocolName, const TransportInfo& tinfo) {
  92     acceptorPipeline_->read(transport.release());
  93   }
  94
  95   // UDP thunk
  96   void onDataAvailable(std::shared_ptr<AsyncUDPSocket> socket,
  97                        const folly::SocketAddress& addr,
  98                        std::unique_ptr<folly::IOBuf> buf,
  99                        bool truncated) noexcept {
 100     acceptorPipeline_->read(buf.release());
 101   }
 102
 103  private:
 104   EventBase* base_;
 105
 106   std::shared_ptr<PipelineFactory<Pipeline>> childPipelineFactory_;
 107   std::shared_ptr<folly::wangle::Pipeline<void*>> acceptorPipeline_;
 108 };
 109
 110 template <typename Pipeline>
 111 class ServerAcceptorFactory : public AcceptorFactory {
 112  public:
 113   explicit ServerAcceptorFactory(
 114     std::shared_ptr<PipelineFactory<Pipeline>> factory,
 115     std::shared_ptr<PipelineFactory<folly::wangle::Pipeline<void*>>> pipeline)
 116     : factory_(factory)
 117     , pipeline_(pipeline) {}
 118
 119   std::shared_ptr<Acceptor> newAcceptor(EventBase* base) {
 120     std::shared_ptr<folly::wangle::Pipeline<void*>> pipeline(
 121         pipeline_->newPipeline(nullptr));
 122     return std::make_shared<ServerAcceptor<Pipeline>>(factory_, pipeline, base);
 123   }
 124  private:
 125   std::shared_ptr<PipelineFactory<Pipeline>> factory_;
 126   std::shared_ptr<PipelineFactory<
 127     folly::wangle::Pipeline<void*>>> pipeline_;
 128 };
 129
 130 class ServerWorkerPool : public folly::wangle::ThreadPoolExecutor::Observer {
 131  public:
 132   explicit ServerWorkerPool(
 133     std::shared_ptr<AcceptorFactory> acceptorFactory,
 134     folly::wangle::IOThreadPoolExecutor* exec,
 135     std::shared_ptr<std::vector<std::shared_ptr<folly::AsyncSocketBase>>> sockets,
 136     std::shared_ptr<ServerSocketFactory> socketFactory)
 137       : acceptorFactory_(acceptorFactory)
 138       , exec_(exec)
 139       , sockets_(sockets)
 140       , socketFactory_(socketFactory) {
 141     CHECK(exec);
 142   }
 143
 144   template <typename F>
 145   void forEachWorker(F&& f) const;
 146
 147   void threadStarted(
 148     folly::wangle::ThreadPoolExecutor::ThreadHandle*);
 149   void threadStopped(
 150     folly::wangle::ThreadPoolExecutor::ThreadHandle*);
 151   void threadPreviouslyStarted(
 152       folly::wangle::ThreadPoolExecutor::ThreadHandle* thread) {
 153     threadStarted(thread);
 154   }
 155   void threadNotYetStopped(
 156       folly::wangle::ThreadPoolExecutor::ThreadHandle* thread) {
 157     threadStopped(thread);
 158   }
 159
 160  private:
 161   std::map<folly::wangle::ThreadPoolExecutor::ThreadHandle*,
 162            std::shared_ptr<Acceptor>> workers_;
 163   std::shared_ptr<AcceptorFactory> acceptorFactory_;
 164   folly::wangle::IOThreadPoolExecutor* exec_{nullptr};
 165   std::shared_ptr<std::vector<std::shared_ptr<folly::AsyncSocketBase>>> sockets_;
 166   std::shared_ptr<ServerSocketFactory> socketFactory_;
 167 };
 168
 169 template <typename F>
 170 void ServerWorkerPool::forEachWorker(F&& f) const {
 171   for (const auto& kv : workers_) {
 172     f(kv.second.get());
 173   }
 174 }
 175
 176 class DefaultAcceptPipelineFactory
 177     : public PipelineFactory<wangle::Pipeline<void*>> {
 178   typedef wangle::Pipeline<void*> AcceptPipeline;
 179
 180  public:
 181   AcceptPipeline* newPipeline(std::shared_ptr<AsyncSocket>) {
 182     return new AcceptPipeline;
 183   }
 184 };
 185
 186 } // namespace