blob: 94f900d252e742c2462f4da9bce0817985c738c1 [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/macros.h"
#include "base/memory/ref_counted.h"
#include "base/optional.h"
#include "base/time/time.h"
#include "net/base/completion_once_callback.h"
#include "net/base/load_states.h"
#include "net/base/net_export.h"
#include "net/base/network_isolation_key.h"
#include "net/base/privacy_mode.h"
#include "net/base/request_priority.h"
#include "net/dns/host_resolver.h"
#include "net/http/http_request_info.h"
#include "net/log/net_log_capture_mode.h"
#include "net/socket/connect_job.h"
#include "net/socket/socket_tag.h"
namespace base {
class Value;
namespace trace_event {
class ProcessMemoryDump;
} // namespace base
namespace net {
class ClientSocketHandle;
struct CommonConnectJobParams;
class HttpAuthController;
class HttpResponseInfo;
class NetLogWithSource;
struct NetworkTrafficAnnotationTag;
class ProxyServer;
struct SSLConfig;
class StreamSocket;
// ClientSocketPools are layered. This defines an interface for lower level
// socket pools to communicate with higher layer pools.
class NET_EXPORT HigherLayeredPool {
virtual ~HigherLayeredPool() {}
// Instructs the HigherLayeredPool to close an idle connection. Return true if
// one was closed. Closing an idle connection will call into the lower layer
// pool it came from, so must be careful of re-entrancy when using this.
virtual bool CloseOneIdleConnection() = 0;
// ClientSocketPools are layered. This defines an interface for higher level
// socket pools to communicate with lower layer pools.
class NET_EXPORT LowerLayeredPool {
virtual ~LowerLayeredPool() {}
// Returns true if a there is currently a request blocked on the per-pool
// (not per-host) max socket limit, either in this pool, or one that it is
// layered on top of.
virtual bool IsStalled() const = 0;
// Called to add or remove a higher layer pool on top of |this|. A higher
// layer pool may be added at most once to |this|, and must be removed prior
// to destruction of |this|.
virtual void AddHigherLayeredPool(HigherLayeredPool* higher_pool) = 0;
virtual void RemoveHigherLayeredPool(HigherLayeredPool* higher_pool) = 0;
// A ClientSocketPool is used to restrict the number of sockets open at a time.
// It also maintains a list of idle persistent sockets.
// Subclasses must also have an inner class SocketParams which is
// the type for the |params| argument in RequestSocket() and
// RequestSockets() below.
class NET_EXPORT ClientSocketPool : public LowerLayeredPool {
// Indicates whether or not a request for a socket should respect the
// SocketPool's global and per-group socket limits.
enum class RespectLimits { DISABLED, ENABLED };
// ProxyAuthCallback is invoked when there is an auth challenge while
// connecting to a tunnel. When |restart_with_auth_callback| is invoked, the
// corresponding socket request is guaranteed not to be completed
// synchronously, nor will the ProxyAuthCallback be invoked against
// synchronously.
typedef base::RepeatingCallback<void(
const HttpResponseInfo& response,
HttpAuthController* auth_controller,
base::OnceClosure restart_with_auth_callback)>
enum class SocketType {
// This is a connection that uses an SSL connection to the final
// destination, though not necessarily to the proxy, if there is one.
// Group ID for a socket request. Requests with the same group ID are
// considered indistinguishable.
class NET_EXPORT GroupId {
GroupId(const HostPortPair& destination,
SocketType socket_type,
PrivacyMode privacy_mode,
NetworkIsolationKey network_isolation_key,
bool disable_secure_dns);
GroupId(const GroupId& group_id);
GroupId& operator=(const GroupId& group_id);
GroupId& operator=(GroupId&& group_id);
const HostPortPair& destination() const { return destination_; }
SocketType socket_type() const { return socket_type_; }
PrivacyMode privacy_mode() const { return privacy_mode_; }
const NetworkIsolationKey& network_isolation_key() const {
return network_isolation_key_;
bool disable_secure_dns() const { return disable_secure_dns_; }
// Returns the group ID as a string, for logging.
std::string ToString() const;
bool operator==(const GroupId& other) const {
return std::tie(destination_, socket_type_, privacy_mode_,
network_isolation_key_, disable_secure_dns_) ==
std::tie(other.destination_, other.socket_type_,
other.privacy_mode_, other.network_isolation_key_,
bool operator<(const GroupId& other) const {
return std::tie(destination_, socket_type_, privacy_mode_,
network_isolation_key_, disable_secure_dns_) <
std::tie(other.destination_, other.socket_type_,
other.privacy_mode_, other.network_isolation_key_,
// The host and port of the final destination (not the proxy).
HostPortPair destination_;
SocketType socket_type_;
// If this request is for a privacy mode / uncredentialed connection.
PrivacyMode privacy_mode_;
// Used to separate requests made in different contexts.
NetworkIsolationKey network_isolation_key_;
// If host resolutions for this request may not use secure DNS.
bool disable_secure_dns_;
// Parameters that, in combination with GroupId, proxy, websocket information,
// and global state, are sufficient to create a ConnectJob.
// TODO( In order to resolve longstanding issues
// related to pooling distinguishable sockets together, remove this class
// entirely.
class NET_EXPORT_PRIVATE SocketParams
: public base::RefCounted<SocketParams> {
// For non-SSL requests / non-HTTPS proxies, the corresponding SSLConfig
// argument may be nullptr.
SocketParams(std::unique_ptr<SSLConfig> ssl_config_for_origin,
std::unique_ptr<SSLConfig> ssl_config_for_proxy);
// Creates a SocketParams object with none of the fields populated. This
// works for the HTTP case only.
static scoped_refptr<SocketParams> CreateForHttpForTesting();
const SSLConfig* ssl_config_for_origin() const {
return ssl_config_for_origin_.get();
const SSLConfig* ssl_config_for_proxy() const {
return ssl_config_for_proxy_.get();
friend class base::RefCounted<SocketParams>;
std::unique_ptr<SSLConfig> ssl_config_for_origin_;
std::unique_ptr<SSLConfig> ssl_config_for_proxy_;
~ClientSocketPool() override;
// Requests a connected socket with a specified GroupId.
// There are five possible results from calling this function:
// 1) RequestSocket returns OK and initializes |handle| with a reused socket.
// 2) RequestSocket returns OK with a newly connected socket.
// 3) RequestSocket returns ERR_IO_PENDING. The handle will be added to a
// wait list until a socket is available to reuse or a new socket finishes
// connecting. |priority| will determine the placement into the wait list.
// 4) An error occurred early on, so RequestSocket returns an error code.
// 5) A recoverable error occurred while setting up the socket. An error
// code is returned, but the |handle| is initialized with the new socket.
// The caller must recover from the error before using the connection, or
// Disconnect the socket before releasing or resetting the |handle|.
// The current recoverable errors are: the errors accepted by
// IsCertificateError(err) and HTTPS_PROXY_TUNNEL_RESPONSE when reported by
// HttpProxyClientSocketPool.
// If this function returns OK, then |handle| is initialized upon return.
// The |handle|'s is_initialized method will return true in this case. If a
// StreamSocket was reused, then ClientSocketPool will call
// |handle|->set_reused(true). In either case, the socket will have been
// allocated and will be connected. A client might want to know whether or
// not the socket is reused in order to request a new socket if it encounters
// an error with the reused socket.
// If ERR_IO_PENDING is returned, then the callback will be used to notify the
// client of completion.
// Profiling information for the request is saved to |net_log| if non-NULL.
// If |respect_limits| is DISABLED, priority must be HIGHEST.
// |proxy_annotation_tag| is the annotation used for proxy-related reads and
// writes, and may be nullopt if (and only if) no proxy is in use.
// |proxy_auth_callback| will be invoked each time an auth challenge is seen
// while establishing a tunnel. It will be invoked asynchronously, once for
// each auth challenge seen.
virtual int RequestSocket(
const GroupId& group_id,
scoped_refptr<SocketParams> params,
const base::Optional<NetworkTrafficAnnotationTag>& proxy_annotation_tag,
RequestPriority priority,
const SocketTag& socket_tag,
RespectLimits respect_limits,
ClientSocketHandle* handle,
CompletionOnceCallback callback,
const ProxyAuthCallback& proxy_auth_callback,
const NetLogWithSource& net_log) = 0;
// RequestSockets is used to request that |num_sockets| be connected in the
// connection group for |group_id|. If the connection group already has
// |num_sockets| idle sockets / active sockets / currently connecting sockets,
// then this function doesn't do anything. Otherwise, it will start up as
// many connections as necessary to reach |num_sockets| total sockets for the
// group. It uses |params| to control how to connect the sockets. The
// ClientSocketPool will assign a priority to the new connections, if any.
// This priority will probably be lower than all others, since this method
// is intended to make sure ahead of time that |num_sockets| sockets are
// available to talk to a host.
virtual void RequestSockets(
const GroupId& group_id,
scoped_refptr<SocketParams> params,
const base::Optional<NetworkTrafficAnnotationTag>& proxy_annotation_tag,
int num_sockets,
const NetLogWithSource& net_log) = 0;
// Called to change the priority of a RequestSocket call that returned
// ERR_IO_PENDING and has not yet asynchronously completed. The same handle
// parameter must be passed to this method as was passed to the
// RequestSocket call being modified.
// This function is a no-op if |priority| is the same as the current
// request priority.
virtual void SetPriority(const GroupId& group_id,
ClientSocketHandle* handle,
RequestPriority priority) = 0;
// Called to cancel a RequestSocket call that returned ERR_IO_PENDING. The
// same handle parameter must be passed to this method as was passed to the
// RequestSocket call being cancelled. The associated callback is not run.
// If |cancel_connect_job| is true, and there are more ConnectJobs than
// requests, a ConnectJob will be canceled. If it's false, excess ConnectJobs
// may be allowed to continue, just in case there are new requests to the same
// endpoint.
virtual void CancelRequest(const GroupId& group_id,
ClientSocketHandle* handle,
bool cancel_connect_job) = 0;
// Called to release a socket once the socket is no longer needed. If the
// socket still has an established connection, then it will be added to the
// set of idle sockets to be used to satisfy future RequestSocket calls.
// Otherwise, the StreamSocket is destroyed. |generation| is used to
// differentiate between updated versions of the same pool instance. The
// pool's generation will change when it flushes, so it can use this
// |generation| to discard sockets with mismatched ids.
virtual void ReleaseSocket(const GroupId& group_id,
std::unique_ptr<StreamSocket> socket,
int64_t generation) = 0;
// This flushes all state from the ClientSocketPool. This means that all
// idle and connecting sockets are discarded with the given |error|.
// Active sockets being held by ClientSocketPool clients will be discarded
// when released back to the pool.
// Does not flush any pools wrapped by |this|.
virtual void FlushWithError(int error) = 0;
// Called to close any idle connections held by the connection manager.
virtual void CloseIdleSockets() = 0;
// Called to close any idle connections held by the connection manager.
virtual void CloseIdleSocketsInGroup(const GroupId& group_id) = 0;
// The total number of idle sockets in the pool.
virtual int IdleSocketCount() const = 0;
// The total number of idle sockets in a connection group.
virtual size_t IdleSocketCountInGroup(const GroupId& group_id) const = 0;
// Determine the LoadState of a connecting ClientSocketHandle.
virtual LoadState GetLoadState(const GroupId& group_id,
const ClientSocketHandle* handle) const = 0;
// Retrieves information on the current state of the pool as a
// Value.
// If |include_nested_pools| is true, the states of any nested
// ClientSocketPools will be included.
virtual base::Value GetInfoAsValue(const std::string& name,
const std::string& type) const = 0;
// Dumps memory allocation stats. |parent_dump_absolute_name| is the name
// used by the parent MemoryAllocatorDump in the memory dump hierarchy.
virtual void DumpMemoryStats(
base::trace_event::ProcessMemoryDump* pmd,
const std::string& parent_dump_absolute_name) const = 0;
// Returns the maximum amount of time to wait before retrying a connect.
static const int kMaxConnectRetryIntervalMs = 250;
static base::TimeDelta used_idle_socket_timeout();
static void set_used_idle_socket_timeout(base::TimeDelta timeout);
void NetLogTcpClientSocketPoolRequestedSocket(const NetLogWithSource& net_log,
const GroupId& group_id);
// Utility method to log a GroupId with a NetLog event.
static base::Value NetLogGroupIdParams(const GroupId& group_id);
static std::unique_ptr<ConnectJob> CreateConnectJob(
GroupId group_id,
scoped_refptr<SocketParams> socket_params,
const ProxyServer& proxy_server,
const base::Optional<NetworkTrafficAnnotationTag>& proxy_annotation_tag,
bool is_for_websockets,
const CommonConnectJobParams* common_connect_job_params,
RequestPriority request_priority,
SocketTag socket_tag,
ConnectJob::Delegate* delegate);
} // namespace net