chrome/common/local_discovery/service_discovery_client.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_H_
   6 #define CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/callback.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/time/time.h"
  14 #include "net/base/address_family.h"
  15 #include "net/base/host_port_pair.h"
  16 #include "net/base/net_util.h"
  17
  18 namespace net {
  19 class MDnsClient;
  20 }
  21
  22 namespace local_discovery {
  23
  24 struct ServiceDescription {
  25  public:
  26   ServiceDescription();
  27   ~ServiceDescription();
  28
  29   // Convenience function to get useful parts of the service name. A service
  30   // name follows the format <instance_name>.<service_type>.
  31   std::string instance_name() const;
  32   std::string service_type() const;
  33
  34   // The name of the service.
  35   std::string service_name;
  36   // The address (in host/port format) for the service (from SRV record).
  37   net::HostPortPair address;
  38   // The metadata (from TXT record) of the service.
  39   std::vector<std::string> metadata;
  40   // IP address of the service, if available from cache. May be empty.
  41   net::IPAddressNumber ip_address;
  42   // Last time the service was seen.
  43   base::Time last_seen;
  44 };
  45
  46 // Lets users browse the network for services of interest or listen for changes
  47 // in the services they are interested in. See
  48 // |ServiceDiscoveryClient::CreateServiceWatcher|.
  49 class ServiceWatcher {
  50  public:
  51   enum UpdateType {
  52     UPDATE_ADDED,
  53     UPDATE_CHANGED,
  54     UPDATE_REMOVED,
  55     UPDATE_INVALIDATED
  56   };
  57
  58   // Called when a service has been added or removed for a certain service name.
  59   typedef base::Callback<void(UpdateType, const std::string&)> UpdatedCallback;
  60
  61   // Listening will automatically stop when the destructor is called.
  62   virtual ~ServiceWatcher() {}
  63
  64   // Start the service type watcher.
  65   virtual void Start() = 0;
  66
  67   // Probe for services of this type.
  68   virtual void DiscoverNewServices(bool force_update) = 0;
  69
  70   virtual std::string GetServiceType() const = 0;
  71 };
  72
  73 // Represents a service on the network and allows users to access the service's
  74 // address and metadata. See |ServiceDiscoveryClient::CreateServiceResolver|.
  75 class ServiceResolver {
  76  public:
  77   enum RequestStatus {
  78     STATUS_SUCCESS,
  79     STATUS_REQUEST_TIMEOUT,
  80     STATUS_KNOWN_NONEXISTENT
  81   };
  82
  83   // A callback called once the service has been resolved.
  84   typedef base::Callback<void(RequestStatus, const ServiceDescription&)>
  85       ResolveCompleteCallback;
  86
  87   // Listening will automatically stop when the destructor is called.
  88   virtual ~ServiceResolver() {}
  89
  90   // Start the service reader.
  91   virtual void StartResolving() = 0;
  92
  93   virtual std::string GetName() const = 0;
  94 };
  95
  96 class LocalDomainResolver {
  97  public:
  98   typedef base::Callback<void(bool /*success*/,
  99                               const net::IPAddressNumber& /*address_ipv4*/,
 100                               const net::IPAddressNumber& /*address_ipv6*/)>
 101       IPAddressCallback;
 102
 103   virtual ~LocalDomainResolver() {}
 104
 105   virtual void Start() = 0;
 106 };
 107
 108 class ServiceDiscoveryClient {
 109  public:
 110   virtual ~ServiceDiscoveryClient() {}
 111
 112   // Create a service watcher object listening for DNS-SD service announcements
 113   // on service type |service_type|.
 114   virtual scoped_ptr<ServiceWatcher> CreateServiceWatcher(
 115       const std::string& service_type,
 116       const ServiceWatcher::UpdatedCallback& callback) = 0;
 117
 118   // Create a service resolver object for getting detailed service information
 119   // for the service called |service_name|.
 120   virtual scoped_ptr<ServiceResolver> CreateServiceResolver(
 121       const std::string& service_name,
 122       const ServiceResolver::ResolveCompleteCallback& callback) = 0;
 123
 124   // Create a resolver for local domain, both ipv4 or ipv6.
 125   virtual scoped_ptr<LocalDomainResolver> CreateLocalDomainResolver(
 126       const std::string& domain,
 127       net::AddressFamily address_family,
 128       const LocalDomainResolver::IPAddressCallback& callback) = 0;
 129 };
 130
 131 }  // namespace local_discovery
 132
 133 #endif  // CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_H_