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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/client_socket_pool.h"
#include "base/message_loop.h"
#include "net/base/client_socket.h"
#include "net/base/client_socket_handle.h"
#include "net/base/net_errors.h"
using base::TimeDelta;
namespace {
// The timeout value, in seconds, used to clean up idle sockets that can't be
// reused.
//
// Note: It's important to close idle sockets that have received data as soon
// as possible because the received data may cause BSOD on Windows XP under
// some conditions. See http://crbug.com/4606.
const int kCleanupInterval = 10; // DO NOT INCREASE THIS TIMEOUT.
// The maximum duration, in seconds, to keep idle persistent sockets alive.
const int kIdleTimeout = 300; // 5 minutes.
} // namespace
namespace net {
ClientSocketPool::ClientSocketPool(int max_sockets_per_group)
: idle_socket_count_(0),
max_sockets_per_group_(max_sockets_per_group) {
}
ClientSocketPool::~ClientSocketPool() {
// Clean up any idle sockets. Assert that we have no remaining active
// sockets or pending requests. They should have all been cleaned up prior
// to the manager being destroyed.
CloseIdleSockets();
DCHECK(group_map_.empty());
}
int ClientSocketPool::RequestSocket(ClientSocketHandle* handle,
CompletionCallback* callback) {
Group& group = group_map_[handle->group_name_];
// Can we make another active socket now?
if (group.active_socket_count == max_sockets_per_group_) {
Request r;
r.handle = handle;
DCHECK(callback);
r.callback = callback;
group.pending_requests.push_back(r);
return ERR_IO_PENDING;
}
// OK, we are going to activate one.
group.active_socket_count++;
// Use idle sockets in LIFO order because they're more likely to be
// still reusable.
while (!group.idle_sockets.empty()) {
IdleSocket idle_socket = group.idle_sockets.back();
group.idle_sockets.pop_back();
DecrementIdleCount();
if ((*idle_socket.ptr)->IsConnectedAndIdle()) {
// We found one we can reuse!
handle->socket_ = idle_socket.ptr;
return OK;
}
delete idle_socket.ptr;
}
handle->socket_ = new ClientSocketPtr();
return OK;
}
void ClientSocketPool::CancelRequest(ClientSocketHandle* handle) {
Group& group = group_map_[handle->group_name_];
// In order for us to be canceling a pending request, we must have active
// sockets equaling the limit. NOTE: The correctness of the code doesn't
// require this assertion.
DCHECK(group.active_socket_count == max_sockets_per_group_);
// Search pending_requests for matching handle.
std::deque<Request>::iterator it = group.pending_requests.begin();
for (; it != group.pending_requests.end(); ++it) {
if (it->handle == handle) {
group.pending_requests.erase(it);
break;
}
}
}
void ClientSocketPool::ReleaseSocket(ClientSocketHandle* handle) {
// Run this asynchronously to allow the caller to finish before we let
// another to begin doing work. This also avoids nasty recursion issues.
// NOTE: We cannot refer to the handle argument after this method returns.
MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod(
this, &ClientSocketPool::DoReleaseSocket, handle->group_name_,
handle->socket_));
}
void ClientSocketPool::CloseIdleSockets() {
CleanupIdleSockets(true);
}
bool ClientSocketPool::IdleSocket::ShouldCleanup(base::TimeTicks now) const {
bool timed_out = (now - start_time) >=
base::TimeDelta::FromSeconds(kIdleTimeout);
return timed_out || !(*ptr)->IsConnectedAndIdle();
}
void ClientSocketPool::CleanupIdleSockets(bool force) {
if (idle_socket_count_ == 0)
return;
// Current time value. Retrieving it once at the function start rather than
// inside the inner loop, since it shouldn't change by any meaningful amount.
base::TimeTicks now = base::TimeTicks::Now();
GroupMap::iterator i = group_map_.begin();
while (i != group_map_.end()) {
Group& group = i->second;
std::deque<IdleSocket>::iterator j = group.idle_sockets.begin();
while (j != group.idle_sockets.end()) {
if (force || j->ShouldCleanup(now)) {
delete j->ptr;
j = group.idle_sockets.erase(j);
DecrementIdleCount();
} else {
++j;
}
}
// Delete group if no longer needed.
if (group.active_socket_count == 0 && group.idle_sockets.empty()) {
DCHECK(group.pending_requests.empty());
group_map_.erase(i++);
} else {
++i;
}
}
}
void ClientSocketPool::IncrementIdleCount() {
if (++idle_socket_count_ == 1)
timer_.Start(TimeDelta::FromSeconds(kCleanupInterval), this,
&ClientSocketPool::OnCleanupTimerFired);
}
void ClientSocketPool::DecrementIdleCount() {
if (--idle_socket_count_ == 0)
timer_.Stop();
}
void ClientSocketPool::DoReleaseSocket(const std::string& group_name,
ClientSocketPtr* ptr) {
GroupMap::iterator i = group_map_.find(group_name);
DCHECK(i != group_map_.end());
Group& group = i->second;
DCHECK(group.active_socket_count > 0);
group.active_socket_count--;
bool can_reuse = ptr->get() && (*ptr)->IsConnectedAndIdle();
if (can_reuse) {
IdleSocket idle_socket;
idle_socket.ptr = ptr;
idle_socket.start_time = base::TimeTicks::Now();
group.idle_sockets.push_back(idle_socket);
IncrementIdleCount();
} else {
delete ptr;
}
// Process one pending request.
if (!group.pending_requests.empty()) {
Request r = group.pending_requests.front();
group.pending_requests.pop_front();
int rv = RequestSocket(r.handle, NULL);
DCHECK(rv == OK);
r.callback->Run(rv);
return;
}
// Delete group if no longer needed.
if (group.active_socket_count == 0 && group.idle_sockets.empty()) {
DCHECK(group.pending_requests.empty());
group_map_.erase(i);
}
}
} // namespace net
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