Revert of Revert of Move service_discovery_client_impl.* into chrome/common.

chrome/common/local_discovery/service_discovery_client_impl.h

Index: chrome/common/local_discovery/service_discovery_client_impl.h
diff --git a/chrome/common/local_discovery/service_discovery_client_impl.h b/chrome/common/local_discovery/service_discovery_client_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..c9b7b7bf06685c0b736c55f9d82db81a568954c1
--- /dev/null
+++ b/chrome/common/local_discovery/service_discovery_client_impl.h
@@ -0,0 +1,273 @@
+// Copyright 2013 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 CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_IMPL_H_
+#define CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_IMPL_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/cancelable_callback.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "chrome/common/local_discovery/service_discovery_client.h"
+#include "net/dns/mdns_client.h"
+
+namespace local_discovery {
+
+class ServiceDiscoveryClientImpl : public ServiceDiscoveryClient {
+ public:
+  // |mdns_client| must outlive the Service Discovery Client.
+  explicit ServiceDiscoveryClientImpl(net::MDnsClient* mdns_client);
+  virtual ~ServiceDiscoveryClientImpl();
+
+  // ServiceDiscoveryClient implementation:
+  virtual scoped_ptr<ServiceWatcher> CreateServiceWatcher(
+      const std::string& service_type,
+      const ServiceWatcher::UpdatedCallback& callback) OVERRIDE;
+
+  virtual scoped_ptr<ServiceResolver> CreateServiceResolver(
+      const std::string& service_name,
+      const ServiceResolver::ResolveCompleteCallback& callback) OVERRIDE;
+
+  virtual scoped_ptr<LocalDomainResolver> CreateLocalDomainResolver(
+      const std::string& domain,
+      net::AddressFamily address_family,
+      const LocalDomainResolver::IPAddressCallback& callback) OVERRIDE;
+
+ private:
+  net::MDnsClient* mdns_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceDiscoveryClientImpl);
+};
+
+class ServiceWatcherImpl : public ServiceWatcher,
+                           public net::MDnsListener::Delegate,
+                           public base::SupportsWeakPtr<ServiceWatcherImpl> {
+ public:
+  ServiceWatcherImpl(const std::string& service_type,
+                     const ServiceWatcher::UpdatedCallback& callback,
+                     net::MDnsClient* mdns_client);
+  // Listening will automatically stop when the destructor is called.
+  virtual ~ServiceWatcherImpl();
+
+  // ServiceWatcher implementation:
+  virtual void Start() OVERRIDE;
+
+  virtual void DiscoverNewServices(bool force_update) OVERRIDE;
+
+  virtual void SetActivelyRefreshServices(
+      bool actively_refresh_services) OVERRIDE;
+
+  virtual std::string GetServiceType() const OVERRIDE;
+
+  virtual void OnRecordUpdate(net::MDnsListener::UpdateType update,
+                              const net::RecordParsed* record) OVERRIDE;
+
+  virtual void OnNsecRecord(const std::string& name, unsigned rrtype) OVERRIDE;
+
+  virtual void OnCachePurged() OVERRIDE;
+
+  virtual void OnTransactionResponse(
+      scoped_ptr<net::MDnsTransaction>* transaction,
+      net::MDnsTransaction::Result result,
+      const net::RecordParsed* record);
+
+ private:
+  struct ServiceListeners {
+    ServiceListeners(const std::string& service_name,
+                     ServiceWatcherImpl* watcher,
+                     net::MDnsClient* mdns_client);
+    ~ServiceListeners();
+    bool Start();
+    void SetActiveRefresh(bool auto_update);
+
+    void set_update_pending(bool update_pending) {
+      update_pending_ = update_pending;
+    }
+
+    bool update_pending() { return update_pending_; }
+
+    void set_has_ptr(bool has_ptr) {
+      has_ptr_ = has_ptr;
+    }
+
+    void set_has_srv(bool has_srv);
+
+    bool has_ptr_or_srv() { return has_ptr_ || has_srv_; }
+
+   private:
+    void OnSRVRecord(net::MDnsTransaction::Result result,
+                     const net::RecordParsed* record);
+
+    void DoQuerySRV();
+
+    scoped_ptr<net::MDnsListener> srv_listener_;
+    scoped_ptr<net::MDnsListener> txt_listener_;
+    scoped_ptr<net::MDnsTransaction> srv_transaction_;
+
+    std::string service_name_;
+    net::MDnsClient* mdns_client_;
+    bool update_pending_;
+
+    bool has_ptr_;
+    bool has_srv_;
+  };
+
+  typedef std::map<std::string, linked_ptr<ServiceListeners> >
+      ServiceListenersMap;
+
+  void ReadCachedServices();
+  void AddService(const std::string& service);
+  void RemovePTR(const std::string& service);
+  void RemoveSRV(const std::string& service);
+  void AddSRV(const std::string& service);
+  bool CreateTransaction(bool active, bool alert_existing_services,
+                         bool force_refresh,
+                         scoped_ptr<net::MDnsTransaction>* transaction);
+
+  void DeferUpdate(ServiceWatcher::UpdateType update_type,
+                   const std::string& service_name);
+  void DeliverDeferredUpdate(ServiceWatcher::UpdateType update_type,
+                             const std::string& service_name);
+
+  void ScheduleQuery(int timeout_seconds);
+
+  void SendQuery(int next_timeout_seconds, bool force_update);
+
+  std::string service_type_;
+  ServiceListenersMap services_;
+  scoped_ptr<net::MDnsTransaction> transaction_network_;
+  scoped_ptr<net::MDnsTransaction> transaction_cache_;
+  scoped_ptr<net::MDnsListener> listener_;
+
+  ServiceWatcher::UpdatedCallback callback_;
+  bool started_;
+  bool actively_refresh_services_;
+
+  net::MDnsClient* mdns_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceWatcherImpl);
+};
+
+class ServiceResolverImpl
+    : public ServiceResolver,
+      public base::SupportsWeakPtr<ServiceResolverImpl> {
+ public:
+  ServiceResolverImpl(const std::string& service_name,
+                      const ServiceResolver::ResolveCompleteCallback& callback,
+                      net::MDnsClient* mdns_client);
+
+  virtual ~ServiceResolverImpl();
+
+  // ServiceResolver implementation:
+  virtual void StartResolving() OVERRIDE;
+
+  virtual std::string GetName() const OVERRIDE;
+
+ private:
+  // Respond to transaction finishing for SRV records.
+  void SrvRecordTransactionResponse(net::MDnsTransaction::Result status,
+                                    const net::RecordParsed* record);
+
+  // Respond to transaction finishing for TXT records.
+  void TxtRecordTransactionResponse(net::MDnsTransaction::Result status,
+                                    const net::RecordParsed* record);
+
+  // Respond to transaction finishing for A records.
+  void ARecordTransactionResponse(net::MDnsTransaction::Result status,
+                                  const net::RecordParsed* record);
+
+  void AlertCallbackIfReady();
+
+  void ServiceNotFound(RequestStatus status);
+
+  // Convert a TXT record to a vector of strings (metadata).
+  const std::vector<std::string>& RecordToMetadata(
+      const net::RecordParsed* record) const;
+
+  // Convert an SRV record to a host and port pair.
+  net::HostPortPair RecordToAddress(
+      const net::RecordParsed* record) const;
+
+  // Convert an A record to an IP address.
+  const net::IPAddressNumber& RecordToIPAddress(
+      const net::RecordParsed* record) const;
+
+  // Convert an MDns status to a service discovery status.
+  RequestStatus MDnsStatusToRequestStatus(
+      net::MDnsTransaction::Result status) const;
+
+  bool CreateTxtTransaction();
+  bool CreateSrvTransaction();
+  void CreateATransaction();
+
+  std::string service_name_;
+  ResolveCompleteCallback callback_;
+
+  bool has_resolved_;
+
+  bool metadata_resolved_;
+  bool address_resolved_;
+
+  scoped_ptr<net::MDnsTransaction> txt_transaction_;
+  scoped_ptr<net::MDnsTransaction> srv_transaction_;
+  scoped_ptr<net::MDnsTransaction> a_transaction_;
+
+  ServiceDescription service_staging_;
+
+  net::MDnsClient* mdns_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceResolverImpl);
+};
+
+class LocalDomainResolverImpl : public LocalDomainResolver {
+ public:
+  LocalDomainResolverImpl(const std::string& domain,
+                          net::AddressFamily address_family,
+                          const IPAddressCallback& callback,
+                          net::MDnsClient* mdns_client);
+  virtual ~LocalDomainResolverImpl();
+
+  virtual void Start() OVERRIDE;
+
+  const std::string& domain() { return domain_; }
+
+ private:
+  void OnTransactionComplete(
+      net::MDnsTransaction::Result result,
+      const net::RecordParsed* record);
+
+  scoped_ptr<net::MDnsTransaction> CreateTransaction(uint16 type);
+
+  bool IsSuccess();
+
+  void SendResolvedAddresses();
+
+  std::string domain_;
+  net::AddressFamily address_family_;
+  IPAddressCallback callback_;
+
+  scoped_ptr<net::MDnsTransaction> transaction_a_;
+  scoped_ptr<net::MDnsTransaction> transaction_aaaa_;
+
+  int transactions_finished_;
+
+  net::MDnsClient* mdns_client_;
+
+  net::IPAddressNumber address_ipv4_;
+  net::IPAddressNumber address_ipv6_;
+
+  base::CancelableCallback<void()> timeout_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocalDomainResolverImpl);
+};
+
+
+}  // namespace local_discovery
+
+#endif  // CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_IMPL_H_