281 lines
8.6 KiB
C++
281 lines
8.6 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <iomanip>
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#include "webrtc/base/asyncsocket.h"
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#include "webrtc/base/logging.h"
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#include "webrtc/base/socketfactory.h"
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#include "webrtc/base/socketpool.h"
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#include "webrtc/base/socketstream.h"
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#include "webrtc/base/thread.h"
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namespace rtc {
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///////////////////////////////////////////////////////////////////////////////
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// StreamCache - Caches a set of open streams, defers creation to a separate
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// StreamPool.
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///////////////////////////////////////////////////////////////////////////////
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StreamCache::StreamCache(StreamPool* pool) : pool_(pool) {
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}
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StreamCache::~StreamCache() {
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for (ConnectedList::iterator it = active_.begin(); it != active_.end();
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++it) {
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delete it->second;
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}
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for (ConnectedList::iterator it = cached_.begin(); it != cached_.end();
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++it) {
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delete it->second;
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}
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}
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StreamInterface* StreamCache::RequestConnectedStream(
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const SocketAddress& remote, int* err) {
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LOG_F(LS_VERBOSE) << "(" << remote << ")";
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for (ConnectedList::iterator it = cached_.begin(); it != cached_.end();
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++it) {
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if (remote == it->first) {
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it->second->SignalEvent.disconnect(this);
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// Move from cached_ to active_
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active_.push_front(*it);
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cached_.erase(it);
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if (err)
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*err = 0;
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LOG_F(LS_VERBOSE) << "Providing cached stream";
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return active_.front().second;
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}
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}
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if (StreamInterface* stream = pool_->RequestConnectedStream(remote, err)) {
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// We track active streams so that we can remember their address
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active_.push_front(ConnectedStream(remote, stream));
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LOG_F(LS_VERBOSE) << "Providing new stream";
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return active_.front().second;
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}
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return NULL;
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}
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void StreamCache::ReturnConnectedStream(StreamInterface* stream) {
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for (ConnectedList::iterator it = active_.begin(); it != active_.end();
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++it) {
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if (stream == it->second) {
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LOG_F(LS_VERBOSE) << "(" << it->first << ")";
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if (stream->GetState() == SS_CLOSED) {
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// Return closed streams
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LOG_F(LS_VERBOSE) << "Returning closed stream";
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pool_->ReturnConnectedStream(it->second);
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} else {
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// Monitor open streams
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stream->SignalEvent.connect(this, &StreamCache::OnStreamEvent);
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LOG_F(LS_VERBOSE) << "Caching stream";
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cached_.push_front(*it);
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}
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active_.erase(it);
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return;
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}
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}
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ASSERT(false);
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}
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void StreamCache::OnStreamEvent(StreamInterface* stream, int events, int err) {
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if ((events & SE_CLOSE) == 0) {
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LOG_F(LS_WARNING) << "(" << events << ", " << err
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<< ") received non-close event";
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return;
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}
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for (ConnectedList::iterator it = cached_.begin(); it != cached_.end();
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++it) {
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if (stream == it->second) {
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LOG_F(LS_VERBOSE) << "(" << it->first << ")";
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// We don't cache closed streams, so return it.
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it->second->SignalEvent.disconnect(this);
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LOG_F(LS_VERBOSE) << "Returning closed stream";
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pool_->ReturnConnectedStream(it->second);
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cached_.erase(it);
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return;
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}
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}
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ASSERT(false);
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}
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//////////////////////////////////////////////////////////////////////
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// NewSocketPool
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//////////////////////////////////////////////////////////////////////
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NewSocketPool::NewSocketPool(SocketFactory* factory) : factory_(factory) {
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}
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NewSocketPool::~NewSocketPool() {
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}
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StreamInterface*
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NewSocketPool::RequestConnectedStream(const SocketAddress& remote, int* err) {
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AsyncSocket* socket =
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factory_->CreateAsyncSocket(remote.family(), SOCK_STREAM);
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if (!socket) {
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if (err)
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*err = -1;
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return NULL;
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}
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if ((socket->Connect(remote) != 0) && !socket->IsBlocking()) {
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if (err)
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*err = socket->GetError();
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delete socket;
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return NULL;
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}
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if (err)
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*err = 0;
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return new SocketStream(socket);
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}
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void
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NewSocketPool::ReturnConnectedStream(StreamInterface* stream) {
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Thread::Current()->Dispose(stream);
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}
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//////////////////////////////////////////////////////////////////////
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// ReuseSocketPool
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//////////////////////////////////////////////////////////////////////
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ReuseSocketPool::ReuseSocketPool(SocketFactory* factory)
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: factory_(factory), stream_(NULL), checked_out_(false) {
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}
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ReuseSocketPool::~ReuseSocketPool() {
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ASSERT(!checked_out_);
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delete stream_;
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}
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StreamInterface*
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ReuseSocketPool::RequestConnectedStream(const SocketAddress& remote, int* err) {
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// Only one socket can be used from this "pool" at a time
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ASSERT(!checked_out_);
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if (!stream_) {
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LOG_F(LS_VERBOSE) << "Creating new socket";
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int family = remote.family();
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// TODO: Deal with this when we/I clean up DNS resolution.
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if (remote.IsUnresolvedIP()) {
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family = AF_INET;
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}
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AsyncSocket* socket =
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factory_->CreateAsyncSocket(family, SOCK_STREAM);
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if (!socket) {
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if (err)
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*err = -1;
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return NULL;
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}
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stream_ = new SocketStream(socket);
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}
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if ((stream_->GetState() == SS_OPEN) && (remote == remote_)) {
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LOG_F(LS_VERBOSE) << "Reusing connection to: " << remote_;
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} else {
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remote_ = remote;
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stream_->Close();
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if ((stream_->GetSocket()->Connect(remote_) != 0)
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&& !stream_->GetSocket()->IsBlocking()) {
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if (err)
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*err = stream_->GetSocket()->GetError();
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return NULL;
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} else {
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LOG_F(LS_VERBOSE) << "Opening connection to: " << remote_;
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}
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}
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stream_->SignalEvent.disconnect(this);
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checked_out_ = true;
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if (err)
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*err = 0;
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return stream_;
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}
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void
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ReuseSocketPool::ReturnConnectedStream(StreamInterface* stream) {
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ASSERT(stream == stream_);
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ASSERT(checked_out_);
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checked_out_ = false;
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// Until the socket is reused, monitor it to determine if it closes.
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stream_->SignalEvent.connect(this, &ReuseSocketPool::OnStreamEvent);
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}
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void
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ReuseSocketPool::OnStreamEvent(StreamInterface* stream, int events, int err) {
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ASSERT(stream == stream_);
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ASSERT(!checked_out_);
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// If the stream was written to and then immediately returned to us then
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// we may get a writable notification for it, which we should ignore.
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if (events == SE_WRITE) {
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LOG_F(LS_VERBOSE) << "Pooled Socket unexpectedly writable: ignoring";
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return;
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}
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// If the peer sent data, we can't process it, so drop the connection.
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// If the socket has closed, clean it up.
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// In either case, we'll reconnect it the next time it is used.
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ASSERT(0 != (events & (SE_READ|SE_CLOSE)));
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if (0 != (events & SE_CLOSE)) {
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LOG_F(LS_VERBOSE) << "Connection closed with error: " << err;
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} else {
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LOG_F(LS_VERBOSE) << "Pooled Socket unexpectedly readable: closing";
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}
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stream_->Close();
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}
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///////////////////////////////////////////////////////////////////////////////
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// LoggingPoolAdapter - Adapts a StreamPool to supply streams with attached
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// LoggingAdapters.
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///////////////////////////////////////////////////////////////////////////////
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LoggingPoolAdapter::LoggingPoolAdapter(
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StreamPool* pool, LoggingSeverity level, const std::string& label,
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bool binary_mode)
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: pool_(pool), level_(level), label_(label), binary_mode_(binary_mode) {
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}
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LoggingPoolAdapter::~LoggingPoolAdapter() {
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for (StreamList::iterator it = recycle_bin_.begin();
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it != recycle_bin_.end(); ++it) {
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delete *it;
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}
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}
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StreamInterface* LoggingPoolAdapter::RequestConnectedStream(
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const SocketAddress& remote, int* err) {
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if (StreamInterface* stream = pool_->RequestConnectedStream(remote, err)) {
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ASSERT(SS_CLOSED != stream->GetState());
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std::stringstream ss;
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ss << label_ << "(0x" << std::setfill('0') << std::hex << std::setw(8)
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<< stream << ")";
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LOG_V(level_) << ss.str()
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<< ((SS_OPEN == stream->GetState()) ? " Connected"
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: " Connecting")
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<< " to " << remote;
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if (recycle_bin_.empty()) {
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return new LoggingAdapter(stream, level_, ss.str(), binary_mode_);
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}
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LoggingAdapter* logging = recycle_bin_.front();
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recycle_bin_.pop_front();
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logging->set_label(ss.str());
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logging->Attach(stream);
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return logging;
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}
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return NULL;
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}
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void LoggingPoolAdapter::ReturnConnectedStream(StreamInterface* stream) {
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LoggingAdapter* logging = static_cast<LoggingAdapter*>(stream);
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pool_->ReturnConnectedStream(logging->Detach());
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recycle_bin_.push_back(logging);
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}
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///////////////////////////////////////////////////////////////////////////////
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} // namespace rtc
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