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/ChannelPipeline.h>
  24 #include <folly/wangle/channel/ChannelHandler.h>
  25
  26 namespace folly {
  27
  28 template <typename Pipeline>
  29 class ServerAcceptor
  30     : public Acceptor
  31     , public folly::wangle::ChannelHandlerAdapter<void*, std::exception> {
  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::ChannelPipeline<
  64                           void*, std::exception>> acceptorPipeline,
  65         EventBase* base)
  66       : Acceptor(ServerSocketConfig())
  67       , base_(base)
  68       , childPipelineFactory_(pipelineFactory)
  69       , acceptorPipeline_(acceptorPipeline) {
  70     Acceptor::init(nullptr, base_);
  71     CHECK(acceptorPipeline_);
  72
  73     acceptorPipeline_->addBack(folly::wangle::ChannelHandlerPtr<ServerAcceptor, false>(this));
  74     acceptorPipeline_->finalize();
  75   }
  76
  77   void read(Context* ctx, void* conn) {
  78     AsyncSocket::UniquePtr transport((AsyncSocket*)conn);
  79       std::unique_ptr<Pipeline,
  80                        folly::DelayedDestruction::Destructor>
  81       pipeline(childPipelineFactory_->newPipeline(
  82         std::shared_ptr<AsyncSocket>(
  83           transport.release(),
  84           folly::DelayedDestruction::Destructor())));
  85     auto connection = new ServerConnection(std::move(pipeline));
  86     Acceptor::addConnection(connection);
  87   }
  88
  89   folly::Future<void> write(Context* ctx, std::exception e) {
  90     return ctx->fireWrite(e);
  91   }
  92
  93   /* See Acceptor::onNewConnection for details */
  94   void onNewConnection(
  95     AsyncSocket::UniquePtr transport, const SocketAddress* address,
  96     const std::string& nextProtocolName, const TransportInfo& tinfo) {
  97     acceptorPipeline_->read(transport.release());
  98   }
  99
 100   // UDP thunk
 101   void onDataAvailable(std::shared_ptr<AsyncUDPSocket> socket,
 102                        const folly::SocketAddress& addr,
 103                        std::unique_ptr<folly::IOBuf> buf,
 104                        bool truncated) noexcept {
 105     acceptorPipeline_->read(buf.release());
 106   }
 107
 108  private:
 109   EventBase* base_;
 110
 111   std::shared_ptr<PipelineFactory<Pipeline>> childPipelineFactory_;
 112   std::shared_ptr<folly::wangle::ChannelPipeline<
 113     void*, std::exception>> acceptorPipeline_;
 114 };
 115
 116 template <typename Pipeline>
 117 class ServerAcceptorFactory : public AcceptorFactory {
 118  public:
 119   explicit ServerAcceptorFactory(
 120     std::shared_ptr<PipelineFactory<Pipeline>> factory,
 121     std::shared_ptr<PipelineFactory<folly::wangle::ChannelPipeline<
 122     void*, std::exception>>> pipeline)
 123     : factory_(factory)
 124     , pipeline_(pipeline) {}
 125
 126   std::shared_ptr<Acceptor> newAcceptor(EventBase* base) {
 127     std::shared_ptr<folly::wangle::ChannelPipeline<
 128                       void*, std::exception>> pipeline(
 129                         pipeline_->newPipeline(nullptr));
 130     return std::make_shared<ServerAcceptor<Pipeline>>(factory_, pipeline, base);
 131   }
 132  private:
 133   std::shared_ptr<PipelineFactory<Pipeline>> factory_;
 134   std::shared_ptr<PipelineFactory<
 135     folly::wangle::ChannelPipeline<
 136       void*, std::exception>>> pipeline_;
 137 };
 138
 139 class ServerWorkerPool : public folly::wangle::ThreadPoolExecutor::Observer {
 140  public:
 141   explicit ServerWorkerPool(
 142     std::shared_ptr<AcceptorFactory> acceptorFactory,
 143     folly::wangle::IOThreadPoolExecutor* exec,
 144     std::shared_ptr<std::vector<std::shared_ptr<folly::AsyncSocketBase>>> sockets,
 145     std::shared_ptr<ServerSocketFactory> socketFactory)
 146       : acceptorFactory_(acceptorFactory)
 147       , exec_(exec)
 148       , sockets_(sockets)
 149       , socketFactory_(socketFactory) {
 150     CHECK(exec);
 151   }
 152
 153   template <typename F>
 154   void forEachWorker(F&& f) const;
 155
 156   void threadStarted(
 157     folly::wangle::ThreadPoolExecutor::ThreadHandle*);
 158   void threadStopped(
 159     folly::wangle::ThreadPoolExecutor::ThreadHandle*);
 160   void threadPreviouslyStarted(
 161       folly::wangle::ThreadPoolExecutor::ThreadHandle* thread) {
 162     threadStarted(thread);
 163   }
 164   void threadNotYetStopped(
 165       folly::wangle::ThreadPoolExecutor::ThreadHandle* thread) {
 166     threadStopped(thread);
 167   }
 168
 169  private:
 170   std::map<folly::wangle::ThreadPoolExecutor::ThreadHandle*,
 171            std::shared_ptr<Acceptor>> workers_;
 172   std::shared_ptr<AcceptorFactory> acceptorFactory_;
 173   folly::wangle::IOThreadPoolExecutor* exec_{nullptr};
 174   std::shared_ptr<std::vector<std::shared_ptr<folly::AsyncSocketBase>>> sockets_;
 175   std::shared_ptr<ServerSocketFactory> socketFactory_;
 176 };
 177
 178 template <typename F>
 179 void ServerWorkerPool::forEachWorker(F&& f) const {
 180   for (const auto& kv : workers_) {
 181     f(kv.second.get());
 182   }
 183 }
 184
 185 class DefaultAcceptPipelineFactory
 186     : public PipelineFactory<wangle::ChannelPipeline<void*, std::exception>> {
 187   typedef wangle::ChannelPipeline<
 188       void*,
 189       std::exception> AcceptPipeline;
 190
 191  public:
 192   AcceptPipeline* newPipeline(std::shared_ptr<AsyncSocket>) {
 193     return new AcceptPipeline;
 194   }
 195 };
 196
 197 } // namespace