/// <summary>
/// Starts the network services.
/// </summary>
/// <returns>
/// A task that represents the asynchronous operation.
/// </returns>
/// <remarks>
/// Starts the various IPFS and PeerTalk network services. This should
/// be called after any configuration changes.
/// </remarks>
/// <exception cref="Exception">
/// When the engine is already started.
/// </exception>
public async Task StartAsync()
{
if (stopTasks.Count > 0)
{
throw new Exception("IPFS engine is already started.");
}
var localPeer = await LocalPeer.ConfigureAwait(false);
log.Debug("starting " + localPeer.Id);
// Everybody needs the swarm.
var swarm = await SwarmService.ConfigureAwait(false);
stopTasks.Add(async() =>
{
await swarm.StopAsync().ConfigureAwait(false);
});
await swarm.StartAsync().ConfigureAwait(false);
// Start the primary services.
var tasks = new List <Func <Task> >
{
async() =>
{
var bitswap = await BitswapService.ConfigureAwait(false);
stopTasks.Add(async() => await bitswap.StopAsync().ConfigureAwait(false));
await bitswap.StartAsync().ConfigureAwait(false);
},
async() =>
{
var dht = await DhtService.ConfigureAwait(false);
stopTasks.Add(async() => await dht.StopAsync().ConfigureAwait(false));
await dht.StartAsync().ConfigureAwait(false);
},
async() =>
{
var pubsub = await PubSubService.ConfigureAwait(false);
stopTasks.Add(async() => await pubsub.StopAsync().ConfigureAwait(false));
await pubsub.StartAsync().ConfigureAwait(false);
},
};
log.Debug("waiting for services to start");
await Task.WhenAll(tasks.Select(t => t())).ConfigureAwait(false);
// Starting listening to the swarm.
var json = await Config.GetAsync("Addresses.Swarm").ConfigureAwait(false);
var numberListeners = 0;
foreach (string a in json)
{
try
{
await swarm.StartListeningAsync(a).ConfigureAwait(false);
++numberListeners;
}
catch (Exception e)
{
log.Warn($"Listener failure for '{a}'", e);
// eat the exception
}
}
if (numberListeners == 0)
{
log.Error("No listeners were created.");
}
// Now that the listener addresses are established, the discovery
// services can begin.
MulticastService multicast = null;
if (!Options.Discovery.DisableMdns)
{
multicast = new MulticastService();
#pragma warning disable CS1998
stopTasks.Add(async() => multicast.Dispose());
#pragma warning restore CS1998
}
var autodialer = new AutoDialer(swarm)
{
MinConnections = Options.Swarm.MinConnections
};
#pragma warning disable CS1998
stopTasks.Add(async() => autodialer.Dispose());
#pragma warning restore CS1998
tasks = new List <Func <Task> >
{
// Bootstrap discovery
async() =>
{
var bootstrap = new PeerTalk.Discovery.Bootstrap
{
Addresses = await this.Bootstrap.ListAsync()
};
bootstrap.PeerDiscovered += OnPeerDiscovered;
stopTasks.Add(async() => await bootstrap.StopAsync().ConfigureAwait(false));
await bootstrap.StartAsync().ConfigureAwait(false);
},
// New multicast DNS discovery
async() =>
{
if (Options.Discovery.DisableMdns)
{
return;
}
var mdns = new PeerTalk.Discovery.MdnsNext
{
LocalPeer = localPeer,
MulticastService = multicast
};
if (Options.Swarm.PrivateNetworkKey != null)
{
mdns.ServiceName = $"_p2p-{Options.Swarm.PrivateNetworkKey.Fingerprint().ToHexString()}._udp";
}
mdns.PeerDiscovered += OnPeerDiscovered;
stopTasks.Add(async() => await mdns.StopAsync().ConfigureAwait(false));
await mdns.StartAsync().ConfigureAwait(false);
},
// Old style JS multicast DNS discovery
async() =>
{
if (Options.Discovery.DisableMdns || Options.Swarm.PrivateNetworkKey != null)
{
return;
}
var mdns = new PeerTalk.Discovery.MdnsJs
{
LocalPeer = localPeer,
MulticastService = multicast
};
mdns.PeerDiscovered += OnPeerDiscovered;
stopTasks.Add(async() => await mdns.StopAsync().ConfigureAwait(false));
await mdns.StartAsync().ConfigureAwait(false);
},
// Old style GO multicast DNS discovery
async() =>
{
if (Options.Discovery.DisableMdns || Options.Swarm.PrivateNetworkKey != null)
{
return;
}
var mdns = new PeerTalk.Discovery.MdnsGo
{
LocalPeer = localPeer,
MulticastService = multicast
};
mdns.PeerDiscovered += OnPeerDiscovered;
stopTasks.Add(async() => await mdns.StopAsync().ConfigureAwait(false));
await mdns.StartAsync().ConfigureAwait(false);
},
async() =>
{
if (Options.Discovery.DisableRandomWalk)
{
return;
}
var randomWalk = new RandomWalk {
Dht = Dht
};
stopTasks.Add(async() => await randomWalk.StopAsync().ConfigureAwait(false));
await randomWalk.StartAsync().ConfigureAwait(false);
}
};
log.Debug("waiting for discovery services to start");
await Task.WhenAll(tasks.Select(t => t())).ConfigureAwait(false);
multicast?.Start();
log.Debug("started");
}