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      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   };
     56 
     57   // Called when a service has been added or removed for a certain service name.
     58   typedef base::Callback<void(UpdateType, const std::string&)> UpdatedCallback;
     59 
     60   // Listening will automatically stop when the destructor is called.
     61   virtual ~ServiceWatcher() {}
     62 
     63   // Start the service type watcher.
     64   virtual void Start() = 0;
     65 
     66   // Probe for services of this type.
     67   virtual void DiscoverNewServices(bool force_update) = 0;
     68 
     69   virtual std::string GetServiceType() const = 0;
     70 };
     71 
     72 // Represents a service on the network and allows users to access the service's
     73 // address and metadata. See |ServiceDiscoveryClient::CreateServiceResolver|.
     74 class ServiceResolver {
     75  public:
     76   enum RequestStatus {
     77     STATUS_SUCCESS,
     78     STATUS_REQUEST_TIMEOUT,
     79     STATUS_KNOWN_NONEXISTENT
     80   };
     81 
     82   // A callback called once the service has been resolved.
     83   typedef base::Callback<void(RequestStatus, const ServiceDescription&)>
     84       ResolveCompleteCallback;
     85 
     86   // Listening will automatically stop when the destructor is called.
     87   virtual ~ServiceResolver() {}
     88 
     89   // Start the service reader.
     90   virtual void StartResolving() = 0;
     91 
     92   virtual std::string GetName() const = 0;
     93 };
     94 
     95 class LocalDomainResolver {
     96  public:
     97   typedef base::Callback<void(bool, const net::IPAddressNumber&)>
     98       IPAddressCallback;
     99 
    100   virtual ~LocalDomainResolver() {}
    101 
    102   virtual void Start() = 0;
    103 };
    104 
    105 class ServiceDiscoveryClient {
    106  public:
    107   virtual ~ServiceDiscoveryClient() {}
    108 
    109   // Create a service watcher object listening for DNS-SD service announcements
    110   // on service type |service_type|.
    111   virtual scoped_ptr<ServiceWatcher> CreateServiceWatcher(
    112       const std::string& service_type,
    113       const ServiceWatcher::UpdatedCallback& callback) = 0;
    114 
    115   // Create a service resolver object for getting detailed service information
    116   // for the service called |service_name|.
    117   virtual scoped_ptr<ServiceResolver> CreateServiceResolver(
    118       const std::string& service_name,
    119       const ServiceResolver::ResolveCompleteCallback& callback) = 0;
    120 
    121   // Create a resolver for local domain, both ipv4 or ipv6.
    122   virtual scoped_ptr<LocalDomainResolver> CreateLocalDomainResolver(
    123       const std::string& domain,
    124       net::AddressFamily address_family,
    125       const LocalDomainResolver::IPAddressCallback& callback) = 0;
    126 };
    127 
    128 }  // namespace local_discovery
    129 
    130 #endif  // CHROME_COMMON_LOCAL_DISCOVERY_SERVICE_DISCOVERY_CLIENT_H_
    131