host_resolver_impl.h revision 9ab5563a3196760eb381d102cbb2bc0f7abc6a50
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 52a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifndef NET_DNS_HOST_RESOLVER_IMPL_H_ 62a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define NET_DNS_HOST_RESOLVER_IMPL_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <map> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/gtest_prod_util.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_ptr.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_vector.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/weak_ptr.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/non_thread_safe.h" 16eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/time/time.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/capturing_net_log.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/net_export.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/network_change_notifier.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/prioritized_dispatcher.h" 21c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "net/dns/host_cache.h" 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "net/dns/host_resolver.h" 232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "net/dns/host_resolver_proc.h" 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace net { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class BoundNetLog; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class DnsClient; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class NetLog; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// For each hostname that is requested, HostResolver creates a 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// HostResolverImpl::Job. When this job gets dispatched it creates a ProcTask 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// which runs the given HostResolverProc on a WorkerPool thread. If requests for 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// that same host are made during the job's lifetime, they are attached to the 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// existing job rather than creating a new one. This avoids doing parallel 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// resolves for the same host. 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The way these classes fit together is illustrated by: 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// +----------- HostResolverImpl -------------+ 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// | | | 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Job Job Job 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (for host1, fam1) (for host2, fam2) (for hostx, famx) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// / | | / | | / | | 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Request ... Request Request ... Request Request ... Request 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (port1) (port2) (port3) (port4) (port5) (portX) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// When a HostResolverImpl::Job finishes, the callbacks of each waiting request 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// are run on the origin thread. 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Thread safety: This class is not threadsafe, and must only be called 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// from one thread! 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The HostResolverImpl enforces limits on the maximum number of concurrent 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// threads using PrioritizedDispatcher::Limits. 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Jobs are ordered in the queue based on their priority and order of arrival. 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class NET_EXPORT HostResolverImpl 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : public HostResolver, 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NON_EXPORTED_BASE(public base::NonThreadSafe), 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public NetworkChangeNotifier::IPAddressObserver, 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public NetworkChangeNotifier::DNSObserver { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Parameters for ProcTask which resolves hostnames using HostResolveProc. 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |resolver_proc| is used to perform the actual resolves; it must be 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // thread-safe since it is run from multiple worker threads. If 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |resolver_proc| is NULL then the default host resolver procedure is 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // used (which is SystemHostResolverProc except if overridden). 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // For each attempt, we could start another attempt if host is not resolved 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // within |unresponsive_delay| time. We keep attempting to resolve the host 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // for |max_retry_attempts|. For every retry attempt, we grow the 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |unresponsive_delay| by the |retry_factor| amount (that is retry interval 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // is multiplied by the retry factor each time). Once we have retried 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |max_retry_attempts|, we give up on additional attempts. 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) struct NET_EXPORT_PRIVATE ProcTaskParams { 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Sets up defaults. 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ProcTaskParams(HostResolverProc* resolver_proc, size_t max_retry_attempts); 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ~ProcTaskParams(); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The procedure to use for resolving host names. This will be NULL, except 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // in the case of unit-tests which inject custom host resolving behaviors. 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<HostResolverProc> resolver_proc; 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Maximum number retry attempts to resolve the hostname. 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Pass HostResolver::kDefaultRetryAttempts to choose a default value. 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t max_retry_attempts; 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is the limit after which we make another attempt to resolve the host 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // if the worker thread has not responded yet. 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::TimeDelta unresponsive_delay; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Factor to grow |unresponsive_delay| when we re-re-try. 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 retry_factor; 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Creates a HostResolver that first uses the local cache |cache|, and then 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // falls back to |proc_params.resolver_proc|. 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If |cache| is NULL, then no caching is used. Otherwise we take 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // ownership of the |cache| pointer, and will free it during destruction. 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |job_limits| specifies the maximum number of jobs that the resolver will 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // run at once. This upper-bounds the total number of outstanding 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // DNS transactions (not counting retransmissions and retries). 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |net_log| must remain valid for the life of the HostResolverImpl. 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HostResolverImpl(scoped_ptr<HostCache> cache, 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const PrioritizedDispatcher::Limits& job_limits, 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ProcTaskParams& proc_params, 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NetLog* net_log); 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If any completion callbacks are pending when the resolver is destroyed, 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the host resolutions are cancelled, and the completion callbacks will not 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // be called. 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~HostResolverImpl(); 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Configures maximum number of Jobs in the queue. Exposed for testing. 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Only allowed when the queue is empty. 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void SetMaxQueuedJobs(size_t value); 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Set the DnsClient to be used for resolution. In case of failure, the 1272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // HostResolverProc from ProcTaskParams will be queried. If the DnsClient is 1282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // not pre-configured with a valid DnsConfig, a new config is fetched from 1292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // NetworkChangeNotifier. 1302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) void SetDnsClient(scoped_ptr<DnsClient> dns_client); 1312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // HostResolver methods: 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual int Resolve(const RequestInfo& info, 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses, 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const CompletionCallback& callback, 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RequestHandle* out_req, 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const BoundNetLog& source_net_log) OVERRIDE; 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual int ResolveFromCache(const RequestInfo& info, 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses, 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const BoundNetLog& source_net_log) OVERRIDE; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void CancelRequest(RequestHandle req) OVERRIDE; 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void SetDefaultAddressFamily(AddressFamily address_family) OVERRIDE; 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual AddressFamily GetDefaultAddressFamily() const OVERRIDE; 1442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void SetDnsClientEnabled(bool enabled) OVERRIDE; 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual HostCache* GetHostCache() OVERRIDE; 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual base::Value* GetDnsConfigAsValue() const OVERRIDE; 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) friend class HostResolverImplTest; 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class Job; 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class ProcTask; 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class LoopbackProbeJob; 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class DnsTask; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class Request; 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef HostCache::Key Key; 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef std::map<Key, Job*> JobMap; 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef ScopedVector<Request> RequestsList; 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Helper used by |Resolve()| and |ResolveFromCache()|. Performs IP 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // literal, cache and HOSTS lookup (if enabled), returns OK if successful, 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // ERR_NAME_NOT_RESOLVED if either hostname is invalid or IP literal is 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // incompatible, ERR_DNS_CACHE_MISS if entry was not found in cache and HOSTS. 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ResolveHelper(const Key& key, 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses, 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const BoundNetLog& request_net_log); 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Tries to resolve |key| as an IP, returns true and sets |net_error| if 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // succeeds, returns false otherwise. 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ResolveAsIP(const Key& key, 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* net_error, 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses); 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If |key| is not found in cache returns false, otherwise returns 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // true, sets |net_error| to the cached error code and fills |addresses| 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // if it is a positive entry. 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ServeFromCache(const Key& key, 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* net_error, 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses); 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If we have a DnsClient with a valid DnsConfig, and |key| is found in the 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // HOSTS file, returns true and fills |addresses|. Otherwise returns false. 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ServeFromHosts(const Key& key, 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses); 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Callback from HaveOnlyLoopbackAddresses probe. 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void SetHaveOnlyLoopbackAddresses(bool result); 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns the (hostname, address_family) key to use for |info|, choosing an 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // "effective" address family by inheriting the resolver's default address 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // family when the request leaves it unspecified. 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Key GetEffectiveKeyForRequest(const RequestInfo& info) const; 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Records the result in cache if cache is present. 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void CacheResult(const Key& key, 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const HostCache::Entry& entry, 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::TimeDelta ttl); 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Removes |job| from |jobs_|, only if it exists. 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void RemoveJob(Job* job); 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Aborts all in progress jobs with ERR_NETWORK_CHANGED and notifies their 2062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // requests. Might start new jobs. 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void AbortAllInProgressJobs(); 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Attempts to serve each Job in |jobs_| from the HOSTS file if we have 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // a DnsClient with a valid DnsConfig. 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void TryServingAllJobsFromHosts(); 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // NetworkChangeNotifier::IPAddressObserver: 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnIPAddressChanged() OVERRIDE; 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // NetworkChangeNotifier::DNSObserver: 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnDNSChanged() OVERRIDE; 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // True if have a DnsClient with a valid DnsConfig. 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool HaveDnsConfig() const; 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Called when a host name is successfully resolved and DnsTask was run on it 2232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // and resulted in |net_error|. 2242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) void OnDnsTaskResolve(int net_error); 2252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Allows the tests to catch slots leaking out of the dispatcher. 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t num_running_jobs_for_tests() const { 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return dispatcher_.num_running_jobs(); 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Cache of host resolution results. 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_ptr<HostCache> cache_; 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Map from HostCache::Key to a Job. 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) JobMap jobs_; 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Starts Jobs according to their priority and the configured limits. 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PrioritizedDispatcher dispatcher_; 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Limit on the maximum number of jobs queued in |dispatcher_|. 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t max_queued_jobs_; 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Parameters for ProcTask. 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ProcTaskParams proc_params_; 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) NetLog* net_log_; 2472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Address family to use when the request doesn't specify one. 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressFamily default_address_family_; 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::WeakPtrFactory<HostResolverImpl> weak_ptr_factory_; 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::WeakPtrFactory<HostResolverImpl> probe_weak_ptr_factory_; 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If present, used by DnsTask and ServeFromHosts to resolve requests. 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_ptr<DnsClient> dns_client_; 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // True if received valid config from |dns_config_service_|. Temporary, used 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // to measure performance of DnsConfigService: http://crbug.com/125599 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool received_dns_config_; 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Number of consecutive failures of DnsTask, counted when fallback succeeds. 2632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) unsigned num_dns_failures_; 2642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2659ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch // True if probing is done for each Request to set address family. When false, 2669ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch // explicit setting in |default_address_family_| is used. 2679ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch bool probe_ipv6_support_; 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // True iff ProcTask has successfully resolved a hostname known to have IPv6 2702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // addresses using ADDRESS_FAMILY_UNSPECIFIED. Reset on IP address change. 2712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool resolved_known_ipv6_hostname_; 2722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Any resolver flags that should be added to a request by default. 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HostResolverFlags additional_resolver_flags_; 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 276eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Allow fallback to ProcTask if DnsTask fails. 277eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch bool fallback_to_proctask_; 278eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(HostResolverImpl); 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace net 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif // NET_DNS_HOST_RESOLVER_IMPL_H_ 285