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// Copyright (c) 2011 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.
#ifndef NET_PROXY_PROXY_SERVICE_H_
#define NET_PROXY_PROXY_SERVICE_H_
#pragma once
#include <vector>
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/non_thread_safe.h"
#include "net/base/completion_callback.h"
#include "net/base/net_export.h"
#include "net/base/net_log.h"
#include "net/base/network_change_notifier.h"
#include "net/proxy/proxy_config_service.h"
#include "net/proxy/proxy_info.h"
#include "net/proxy/proxy_server.h"
class GURL;
class MessageLoop;
namespace net {
class DhcpProxyScriptFetcher;
class HostResolver;
class InitProxyResolver;
class NetworkDelegate;
class ProxyResolver;
class ProxyScriptFetcher;
class URLRequestContext;
// This class can be used to resolve the proxy server to use when loading a
// HTTP(S) URL. It uses the given ProxyResolver to handle the actual proxy
// resolution. See ProxyResolverV8 for example.
class NET_EXPORT ProxyService : public NetworkChangeNotifier::IPAddressObserver,
public ProxyConfigService::Observer,
NON_EXPORTED_BASE(public base::NonThreadSafe) {
public:
// The instance takes ownership of |config_service| and |resolver|.
// |net_log| is a possibly NULL destination to send log events to. It must
// remain alive for the lifetime of this ProxyService.
ProxyService(ProxyConfigService* config_service,
ProxyResolver* resolver,
NetLog* net_log);
virtual ~ProxyService();
// Used internally to handle PAC queries.
// TODO(eroman): consider naming this simply "Request".
class PacRequest;
// Returns ERR_IO_PENDING if the proxy information could not be provided
// synchronously, to indicate that the result will be available when the
// callback is run. The callback is run on the thread that calls
// ResolveProxy.
//
// The caller is responsible for ensuring that |results| and |callback|
// remain valid until the callback is run or until |pac_request| is cancelled
// via CancelPacRequest. |pac_request| is only valid while the completion
// callback is still pending. NULL can be passed for |pac_request| if
// the caller will not need to cancel the request.
//
// We use the three possible proxy access types in the following order,
// doing fallback if one doesn't work. See "init_proxy_resolver.h"
// for the specifics.
// 1. WPAD auto-detection
// 2. PAC URL
// 3. named proxy
//
// Profiling information for the request is saved to |net_log| if non-NULL.
int ResolveProxy(const GURL& url,
ProxyInfo* results,
CompletionCallback* callback,
PacRequest** pac_request,
const BoundNetLog& net_log);
// This method is called after a failure to connect or resolve a host name.
// It gives the proxy service an opportunity to reconsider the proxy to use.
// The |results| parameter contains the results returned by an earlier call
// to ResolveProxy. The semantics of this call are otherwise similar to
// ResolveProxy.
//
// NULL can be passed for |pac_request| if the caller will not need to
// cancel the request.
//
// Returns ERR_FAILED if there is not another proxy config to try.
//
// Profiling information for the request is saved to |net_log| if non-NULL.
int ReconsiderProxyAfterError(const GURL& url,
ProxyInfo* results,
CompletionCallback* callback,
PacRequest** pac_request,
const BoundNetLog& net_log);
// Called to report that the last proxy connection succeeded. If |proxy_info|
// has a non empty proxy_retry_info map, the proxies that have been tried (and
// failed) for this request will be marked as bad.
void ReportSuccess(const ProxyInfo& proxy_info);
// Call this method with a non-null |pac_request| to cancel the PAC request.
void CancelPacRequest(PacRequest* pac_request);
// Sets the ProxyScriptFetcher and DhcpProxyScriptFetcher dependencies. This
// is needed if the ProxyResolver is of type ProxyResolverWithoutFetch.
// ProxyService takes ownership of both objects.
void SetProxyScriptFetchers(
ProxyScriptFetcher* proxy_script_fetcher,
DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher);
ProxyScriptFetcher* GetProxyScriptFetcher() const;
// Tells this ProxyService to start using a new ProxyConfigService to
// retrieve its ProxyConfig from. The new ProxyConfigService will immediately
// be queried for new config info which will be used for all subsequent
// ResolveProxy calls. ProxyService takes ownership of
// |new_proxy_config_service|.
void ResetConfigService(ProxyConfigService* new_proxy_config_service);
// Tells the resolver to purge any memory it does not need.
void PurgeMemory();
// Returns the last configuration fetched from ProxyConfigService.
const ProxyConfig& fetched_config() {
return fetched_config_;
}
// Returns the current configuration being used by ProxyConfigService.
const ProxyConfig& config() {
return config_;
}
// Returns the map of proxies which have been marked as "bad".
const ProxyRetryInfoMap& proxy_retry_info() const {
return proxy_retry_info_;
}
// Clears the list of bad proxy servers that has been cached.
void ClearBadProxiesCache() {
proxy_retry_info_.clear();
}
// Forces refetching the proxy configuration, and applying it.
// This re-does everything from fetching the system configuration,
// to downloading and testing the PAC files.
void ForceReloadProxyConfig();
// Creates a proxy service that polls |proxy_config_service| to notice when
// the proxy settings change. We take ownership of |proxy_config_service|.
//
// |num_pac_threads| specifies the maximum number of threads to use for
// executing PAC scripts. Threads are created lazily on demand.
// If |0| is specified, then a default number of threads will be selected.
//
// Having more threads avoids stalling proxy resolve requests when the
// PAC script takes a while to run. This is particularly a problem when PAC
// scripts do synchronous DNS resolutions, since that can take on the order
// of seconds.
//
// However, the disadvantages of using more than 1 thread are:
// (a) can cause compatibility issues for scripts that rely on side effects
// between runs (such scripts should not be common though).
// (b) increases the memory used by proxy resolving, as each thread will
// duplicate its own script context.
// |proxy_script_fetcher| specifies the dependency to use for downloading
// any PAC scripts. The resulting ProxyService will take ownership of it.
//
// |dhcp_proxy_script_fetcher| specifies the dependency to use for attempting
// to retrieve the most appropriate PAC script configured in DHCP. The
// resulting ProxyService will take ownership of it.
//
// |host_resolver| points to the host resolving dependency the PAC script
// should use for any DNS queries. It must remain valid throughout the
// lifetime of the ProxyService.
//
// ##########################################################################
// # See the warnings in net/proxy/proxy_resolver_v8.h describing the
// # multi-threading model. In order for this to be safe to use, *ALL* the
// # other V8's running in the process must use v8::Locker.
// ##########################################################################
static ProxyService* CreateUsingV8ProxyResolver(
ProxyConfigService* proxy_config_service,
size_t num_pac_threads,
ProxyScriptFetcher* proxy_script_fetcher,
DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher,
HostResolver* host_resolver,
NetLog* net_log,
NetworkDelegate* network_delegate);
// Same as CreateUsingV8ProxyResolver, except it uses system libraries
// for evaluating the PAC script if available, otherwise skips
// proxy autoconfig.
static ProxyService* CreateUsingSystemProxyResolver(
ProxyConfigService* proxy_config_service,
size_t num_pac_threads,
NetLog* net_log);
// Creates a ProxyService without support for proxy autoconfig.
static ProxyService* CreateWithoutProxyResolver(
ProxyConfigService* proxy_config_service,
NetLog* net_log);
// Convenience methods that creates a proxy service using the
// specified fixed settings.
static ProxyService* CreateFixed(const ProxyConfig& pc);
static ProxyService* CreateFixed(const std::string& proxy);
// Creates a proxy service that uses a DIRECT connection for all requests.
static ProxyService* CreateDirect();
// |net_log|'s lifetime must exceed ProxyService.
static ProxyService* CreateDirectWithNetLog(NetLog* net_log);
// This method is used by tests to create a ProxyService that returns a
// hardcoded proxy fallback list (|pac_string|) for every URL.
//
// |pac_string| is a list of proxy servers, in the format that a PAC script
// would return it. For example, "PROXY foobar:99; SOCKS fml:2; DIRECT"
static ProxyService* CreateFixedFromPacResult(const std::string& pac_string);
// Creates a config service appropriate for this platform that fetches the
// system proxy settings.
static ProxyConfigService* CreateSystemProxyConfigService(
MessageLoop* io_loop, MessageLoop* file_loop);
// This method should only be used by unit tests.
void set_stall_proxy_auto_config_delay(base::TimeDelta delay) {
stall_proxy_auto_config_delay_ = delay;
}
private:
FRIEND_TEST_ALL_PREFIXES(ProxyServiceTest, UpdateConfigAfterFailedAutodetect);
FRIEND_TEST_ALL_PREFIXES(ProxyServiceTest, UpdateConfigFromPACToDirect);
friend class PacRequest;
// TODO(eroman): change this to a std::set. Note that this requires updating
// some tests in proxy_service_unittest.cc such as:
// ProxyServiceTest.InitialPACScriptDownload
// which expects requests to finish in the order they were added.
typedef std::vector<scoped_refptr<PacRequest> > PendingRequests;
enum State {
STATE_NONE,
STATE_WAITING_FOR_PROXY_CONFIG,
STATE_WAITING_FOR_INIT_PROXY_RESOLVER,
STATE_READY,
};
// Resets all the variables associated with the current proxy configuration,
// and rewinds the current state to |STATE_NONE|. Returns the previous value
// of |current_state_|. If |reset_fetched_config| is true then
// |fetched_config_| will also be reset, otherwise it will be left as-is.
// Resetting it means that we will have to re-fetch the configuration from
// the ProxyConfigService later.
State ResetProxyConfig(bool reset_fetched_config);
// Retrieves the current proxy configuration from the ProxyConfigService, and
// starts initializing for it.
void ApplyProxyConfigIfAvailable();
// Callback for when the proxy resolver has been initialized with a
// PAC script.
void OnInitProxyResolverComplete(int result);
// Returns ERR_IO_PENDING if the request cannot be completed synchronously.
// Otherwise it fills |result| with the proxy information for |url|.
// Completing synchronously means we don't need to query ProxyResolver.
int TryToCompleteSynchronously(const GURL& url, ProxyInfo* result);
// Cancels all of the requests sent to the ProxyResolver. These will be
// restarted when calling ResumeAllPendingRequests().
void SuspendAllPendingRequests();
// Advances the current state to |STATE_READY|, and resumes any pending
// requests which had been stalled waiting for initialization to complete.
void SetReady();
// Returns true if |pending_requests_| contains |req|.
bool ContainsPendingRequest(PacRequest* req);
// Removes |req| from the list of pending requests.
void RemovePendingRequest(PacRequest* req);
// Called when proxy resolution has completed (either synchronously or
// asynchronously). Handles logging the result, and cleaning out
// bad entries from the results list.
int DidFinishResolvingProxy(ProxyInfo* result,
int result_code,
const BoundNetLog& net_log);
// Start initialization using |fetched_config_|.
void InitializeUsingLastFetchedConfig();
// NetworkChangeNotifier::IPAddressObserver
// When this is called, we re-fetch PAC scripts and re-run WPAD.
virtual void OnIPAddressChanged() OVERRIDE;
// ProxyConfigService::Observer
virtual void OnProxyConfigChanged(
const ProxyConfig& config,
ProxyConfigService::ConfigAvailability availability) OVERRIDE;
scoped_ptr<ProxyConfigService> config_service_;
scoped_ptr<ProxyResolver> resolver_;
// We store the proxy configuration that was last fetched from the
// ProxyConfigService, as well as the resulting "effective" configuration.
// The effective configuration is what we condense the original fetched
// settings to after testing the various automatic settings (auto-detect
// and custom PAC url).
ProxyConfig fetched_config_;
ProxyConfig config_;
// Increasing ID to give to the next ProxyConfig that we set.
int next_config_id_;
// The time when the proxy configuration was last read from the system.
base::TimeTicks config_last_update_time_;
// Map of the known bad proxies and the information about the retry time.
ProxyRetryInfoMap proxy_retry_info_;
// Set of pending/inprogress requests.
PendingRequests pending_requests_;
// The fetcher to use when downloading PAC scripts for the ProxyResolver.
// This dependency can be NULL if our ProxyResolver has no need for
// external PAC script fetching.
scoped_ptr<ProxyScriptFetcher> proxy_script_fetcher_;
// The fetcher to use when attempting to download the most appropriate PAC
// script configured in DHCP, if any. Can be NULL if the ProxyResolver has
// no need for DHCP PAC script fetching.
scoped_ptr<DhcpProxyScriptFetcher> dhcp_proxy_script_fetcher_;
// Callback for when |init_proxy_resolver_| is done.
CompletionCallbackImpl<ProxyService> init_proxy_resolver_callback_;
// Helper to download the PAC script (wpad + custom) and apply fallback rules.
//
// Note that the declaration is important here: |proxy_script_fetcher_| and
// |proxy_resolver_| must outlive |init_proxy_resolver_|.
scoped_ptr<InitProxyResolver> init_proxy_resolver_;
State current_state_;
// Either OK or an ERR_* value indicating that a permanent error (e.g.
// failed to fetch the PAC script) prevents proxy resolution.
int permanent_error_;
// This is the log where any events generated by |init_proxy_resolver_| are
// sent to.
NetLog* net_log_;
// The earliest time at which we should run any proxy auto-config. (Used to
// stall re-configuration following an IP address change).
base::TimeTicks stall_proxy_autoconfig_until_;
// The amount of time to stall requests following IP address changes.
base::TimeDelta stall_proxy_auto_config_delay_;
DISALLOW_COPY_AND_ASSIGN(ProxyService);
};
// Wrapper for invoking methods on a ProxyService synchronously.
class NET_EXPORT SyncProxyServiceHelper
: public base::RefCountedThreadSafe<SyncProxyServiceHelper> {
public:
SyncProxyServiceHelper(MessageLoop* io_message_loop,
ProxyService* proxy_service);
int ResolveProxy(const GURL& url,
ProxyInfo* proxy_info,
const BoundNetLog& net_log);
int ReconsiderProxyAfterError(const GURL& url,
ProxyInfo* proxy_info,
const BoundNetLog& net_log);
private:
friend class base::RefCountedThreadSafe<SyncProxyServiceHelper>;
virtual ~SyncProxyServiceHelper();
void StartAsyncResolve(const GURL& url, const BoundNetLog& net_log);
void StartAsyncReconsider(const GURL& url, const BoundNetLog& net_log);
void OnCompletion(int result);
MessageLoop* io_message_loop_;
ProxyService* proxy_service_;
base::WaitableEvent event_;
CompletionCallbackImpl<SyncProxyServiceHelper> callback_;
ProxyInfo proxy_info_;
int result_;
};
} // namespace net
#endif // NET_PROXY_PROXY_SERVICE_H_