blob: 1a0afb96e888f82ac99e7ed0a0878a3274954f32 [file] [log] [blame]
// Copyright (c) 2012 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 <memory>
#include <string>
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "net/base/completion_callback.h"
#include "net/base/ip_endpoint.h"
#include "net/base/load_states.h"
#include "net/base/load_timing_info.h"
#include "net/base/net_errors.h"
#include "net/base/net_export.h"
#include "net/base/request_priority.h"
#include "net/http/http_response_info.h"
#include "net/log/net_log_source.h"
#include "net/log/net_log_with_source.h"
#include "net/socket/client_socket_pool.h"
#include "net/socket/connection_attempts.h"
#include "net/socket/stream_socket.h"
namespace net {
class SocketTag;
// A container for a StreamSocket.
// The handle's |group_name| uniquely identifies the origin and type of the
// connection. It is used by the ClientSocketPool to group similar connected
// client socket objects.
class NET_EXPORT ClientSocketHandle {
enum SocketReuseType {
UNUSED = 0, // unused socket that just finished connecting
UNUSED_IDLE, // unused socket that has been idle for awhile
REUSED_IDLE, // previously used socket
// Initializes a ClientSocketHandle object, which involves talking to the
// ClientSocketPool to obtain a connected socket, possibly reusing one. This
// method returns either OK or ERR_IO_PENDING. On ERR_IO_PENDING, |priority|
// is used to determine the placement in ClientSocketPool's wait list.
// If |respect_limits| is DISABLED, will bypass the wait list, but |priority|
// must also be HIGHEST, if set.
// If this method succeeds, then the socket member will be set to an existing
// connected socket if an existing connected socket was available to reuse,
// otherwise it will be set to a new connected socket. Consumers can then
// call is_reused() to see if the socket was reused. If not reusing an
// existing socket, ClientSocketPool may need to establish a new
// connection using |socket_params|.
// This method returns ERR_IO_PENDING if it cannot complete synchronously, in
// which case the consumer will be notified of completion via |callback|.
// If the pool was not able to reuse an existing socket, the new socket
// may report a recoverable error. In this case, the return value will
// indicate an error and the socket member will be set. If it is determined
// that the error is not recoverable, the Disconnect method should be used
// on the socket, so that it does not get reused.
// A non-recoverable error may set additional state in the ClientSocketHandle
// to allow the caller to determine what went wrong.
// Init may be called multiple times.
// Profiling information for the request is saved to |net_log| if non-NULL.
template <typename PoolType>
int Init(const std::string& group_name,
const scoped_refptr<typename PoolType::SocketParams>& socket_params,
RequestPriority priority,
const SocketTag& socket_tag,
ClientSocketPool::RespectLimits respect_limits,
const CompletionCallback& callback,
PoolType* pool,
const NetLogWithSource& net_log);
// Changes the priority of the ClientSocketHandle to the passed value.
// This function is a no-op if |priority| is the same as the current
// priority, of if Init() has not been called since the last time
// the ClientSocketHandle was reset.
void SetPriority(RequestPriority priority);
// An initialized handle can be reset, which causes it to return to the
// un-initialized state. This releases the underlying socket, which in the
// case of a socket that still has an established connection, indicates that
// the socket may be kept alive for use by a subsequent ClientSocketHandle.
// NOTE: To prevent the socket from being kept alive, be sure to call its
// Disconnect method. This will result in the ClientSocketPool deleting the
// StreamSocket.
void Reset();
// Used after Init() is called, but before the ClientSocketPool has
// initialized the ClientSocketHandle.
LoadState GetLoadState() const;
bool IsPoolStalled() const;
// Adds a higher layered pool on top of the socket pool that |socket_| belongs
// to. At most one higher layered pool can be added to a
// ClientSocketHandle at a time. On destruction or reset, automatically
// removes the higher pool if RemoveHigherLayeredPool has not been called.
void AddHigherLayeredPool(HigherLayeredPool* higher_pool);
// Removes a higher layered pool from the socket pool that |socket_| belongs
// to. |higher_pool| must have been added by the above function.
void RemoveHigherLayeredPool(HigherLayeredPool* higher_pool);
// Closes idle sockets that are in the same group with |this|.
void CloseIdleSocketsInGroup();
// Returns true when Init() has completed successfully.
bool is_initialized() const { return is_initialized_; }
// Sets the portion of LoadTimingInfo related to connection establishment, and
// the socket id. |is_reused| is needed because the handle may not have full
// reuse information. |load_timing_info| must have all default values when
// called. Returns false and makes no changes to |load_timing_info| when
// |socket_| is NULL.
bool GetLoadTimingInfo(bool is_reused,
LoadTimingInfo* load_timing_info) const;
// Dumps memory allocation stats into |stats|. |stats| can be assumed as being
// default initialized upon entry. Implementation overrides fields in
// |stats|.
void DumpMemoryStats(StreamSocket::SocketMemoryStats* stats) const;
// Used by ClientSocketPool to initialize the ClientSocketHandle.
// SetSocket() may also be used if this handle is used as simply for
// socket storage (e.g.,
void SetSocket(std::unique_ptr<StreamSocket> s);
void set_reuse_type(SocketReuseType reuse_type) { reuse_type_ = reuse_type; }
void set_idle_time(base::TimeDelta idle_time) { idle_time_ = idle_time; }
void set_pool_id(int id) { pool_id_ = id; }
void set_is_ssl_error(bool is_ssl_error) { is_ssl_error_ = is_ssl_error; }
void set_ssl_error_response_info(const HttpResponseInfo& ssl_error_state) {
ssl_error_response_info_ = ssl_error_state;
void set_pending_http_proxy_connection(ClientSocketHandle* connection) {
void set_connection_attempts(const ConnectionAttempts& attempts) {
connection_attempts_ = attempts;
// Only valid if there is no |socket_|.
bool is_ssl_error() const {
return is_ssl_error_;
// On an ERR_PROXY_AUTH_REQUESTED error, the |headers| and |auth_challenge|
// fields are filled in. On an ERR_SSL_CLIENT_AUTH_CERT_NEEDED error,
// the |cert_request_info| field is set.
const HttpResponseInfo& ssl_error_response_info() const {
return ssl_error_response_info_;
ClientSocketHandle* release_pending_http_proxy_connection() {
return pending_http_proxy_connection_.release();
// If the connection failed, returns the connection attempts made. (If it
// succeeded, they will be returned through the socket instead; see
// |StreamSocket::GetConnectionAttempts|.)
const ConnectionAttempts& connection_attempts() {
return connection_attempts_;
StreamSocket* socket() { return socket_.get(); }
// SetSocket() must be called with a new socket before this handle
// is destroyed if is_initialized() is true.
std::unique_ptr<StreamSocket> PassSocket();
// These may only be used if is_initialized() is true.
const std::string& group_name() const { return group_name_; }
int id() const { return pool_id_; }
bool is_reused() const { return reuse_type_ == REUSED_IDLE; }
base::TimeDelta idle_time() const { return idle_time_; }
SocketReuseType reuse_type() const { return reuse_type_; }
const LoadTimingInfo::ConnectTiming& connect_timing() const {
return connect_timing_;
void set_connect_timing(const LoadTimingInfo::ConnectTiming& connect_timing) {
connect_timing_ = connect_timing;
// Called on asynchronous completion of an Init() request.
void OnIOComplete(int result);
// Called on completion (both asynchronous & synchronous) of an Init()
// request.
void HandleInitCompletion(int result);
// Resets the state of the ClientSocketHandle. |cancel| indicates whether or
// not to try to cancel the request with the ClientSocketPool. Does not
// reset the supplemental error state.
void ResetInternal(bool cancel);
// Resets the supplemental error state.
void ResetErrorState();
bool is_initialized_;
ClientSocketPool* pool_;
HigherLayeredPool* higher_pool_;
std::unique_ptr<StreamSocket> socket_;
std::string group_name_;
SocketReuseType reuse_type_;
CompletionCallback callback_;
CompletionCallback user_callback_;
base::TimeDelta idle_time_;
int pool_id_; // See ClientSocketPool::ReleaseSocket() for an explanation.
bool is_ssl_error_;
HttpResponseInfo ssl_error_response_info_;
std::unique_ptr<ClientSocketHandle> pending_http_proxy_connection_;
std::vector<ConnectionAttempt> connection_attempts_;
NetLogSource requesting_source_;
// Timing information is set when a connection is successfully established.
LoadTimingInfo::ConnectTiming connect_timing_;
// Template function implementation:
template <typename PoolType>
int ClientSocketHandle::Init(
const std::string& group_name,
const scoped_refptr<typename PoolType::SocketParams>& socket_params,
RequestPriority priority,
const SocketTag& socket_tag,
ClientSocketPool::RespectLimits respect_limits,
const CompletionCallback& callback,
PoolType* pool,
const NetLogWithSource& net_log) {
requesting_source_ = net_log.source();
pool_ = pool;
group_name_ = group_name;
int rv =
pool_->RequestSocket(group_name, &socket_params, priority, socket_tag,
respect_limits, this, callback_, net_log);
if (rv == ERR_IO_PENDING) {
user_callback_ = callback;
} else {
return rv;
} // namespace net