/// <summary>
/// Construct new ZyrePeer object
/// </summary>
/// <param name="container">The dictionary of peers</param>
/// <param name="guid">The identity for this peer</param>
/// <param name="loggerDelegate">An action to take for logging when _verbose is true. Default is null.</param>
/// <returns></returns>
internal static ZyrePeer NewPeer(Dictionary <Guid, ZyrePeer> container, Guid guid, Action <string> loggerDelegate = null)
{
var peer = new ZyrePeer(guid, loggerDelegate);
container[guid] = peer; // overwrite any existing entry for same uuid
return(peer);
}
/// <summary>
/// Delete peer for a given endpoint
/// </summary>
/// <param name="peer"></param>
/// <param name="endpoint"></param>
private void PurgePeer(ZyrePeer peer, string endpoint)
{
if (peer.Endpoint == endpoint)
{
peer.Disconnect();
}
}
/// <summary>
/// We do this once a second:
/// - if peer has gone quiet, send TCP ping and emit EVASIVE event
/// - if peer has disappeared, expire it
/// </summary>
/// <param name="peer">the peer to ping</param>
/// <returns>true if this peer should be removed</returns>
private bool PingPeer(ZyrePeer peer)
{
if (!_isRunning)
{
// We have been stopped. We know longer can communicate to peers.
return(true);
}
if (DateTime.Now >= peer.ExpiredAt)
{
return(true);
}
if (DateTime.Now >= peer.EvasiveAt)
{
// If peer is being evasive, force a TCP ping.
// ZeroMQTODO: do this only once for a peer in this state;
// it would be nicer to use a proper state machine
// for peer management.
_loggerDelegate?.Invoke($"Peer seems dead/slow: name={peer.Name} endpoint={peer.Endpoint}");
ZreMsg.SendPing(_outbox, 0);
// Inform the calling application this peer is being evasive
_outbox.SendMoreFrame("EVASIVE");
_outbox.SendMoreFrame(peer.Uuid.ToByteArray());
_outbox.SendFrame(peer.Name);
}
return(false);
}
/// <summary>
/// Join peer to group
/// </summary>
/// <param name="peer">The peer that is joining this group</param>
/// <param name="groupName">The name of the group to join</param>
/// <returns>the group joined</returns>
private void JoinPeerGroup(ZyrePeer peer, string groupName)
{
var group = RequirePeerGroup(groupName);
group.Join(peer);
// Now tell the caller about the peer joined group
_outbox.SendMoreFrame("JOIN").SendMoreFrame(peer.Uuid.ToByteArray()).SendMoreFrame(peer.Name).SendFrame(groupName);
_loggerDelegate?.Invoke($"JOIN name={peer.Name} group={groupName}");
}
/// <summary>
/// Have peer leave group
/// </summary>
/// <param name="peer"></param>
/// <param name="groupName"></param>
/// <returns></returns>
private void LeavePeerGroup(ZyrePeer peer, string groupName)
{
var group = RequirePeerGroup(groupName);
group.Leave(peer);
// Now tell the caller about the peer left group
_outbox.SendMoreFrame("LEAVE").SendMoreFrame(peer.Uuid.ToByteArray()).SendMoreFrame(peer.Name).SendFrame(groupName);
_loggerDelegate?.Invoke($"LEAVE name={peer.Name} group={groupName}");
}
/// <summary>
/// Remove a peer from our data structures
/// </summary>
/// <param name="peer"></param>
private void RemovePeer(ZyrePeer peer)
{
// Tell the calling application the peer has gone
_outbox.SendMoreFrame("EXIT").SendMoreFrame(peer.Uuid.ToByteArray()).SendFrame(peer.Name);
_loggerDelegate?.Invoke($"EXIT name={peer.Name} endpoint={peer.Endpoint}");
// Remove peer from any groups we've got it in
foreach (var peerGroup in _peerGroups.Values)
{
RemovePeerFromGroup(peerGroup, peer);
}
_peers.Remove(peer.Uuid);
peer.Destroy();
}
/// <summary>
/// Find or create peer via its UUID
/// </summary>
/// <param name="uuid">the identity of peer</param>
/// <param name="endpoint">the endpoint to which we will connect the new peer</param>
/// <returns>A peer (existing, or new one connected to endpoint)</returns>
private ZyrePeer RequirePeer(Guid uuid, string endpoint)
{
Debug.Assert(!string.IsNullOrEmpty(endpoint));
ZyrePeer peer;
if (_peers.TryGetValue(uuid, out peer))
{
if (!_reportedKnownPeersTmp.Contains(peer))
{
//var callingMethod1 = MethodNameLevelAbove();
//_loggerDelegate?.Invoke($"{nameof(ZyreNode)}.{nameof(RequirePeer)}() called by {callingMethod1} returning already-known peer={peer}");
_loggerDelegate?.Invoke($"{nameof(ZyreNode)}.{nameof(RequirePeer)}() returning already-known peer={peer}");
_reportedKnownPeersTmp.Add(peer);
}
return(peer);
}
// Purge any previous peer on same endpoint
foreach (var existingPeer in _peers.Values)
{
PurgePeer(existingPeer, endpoint);
}
//var callingMethod2 = MethodNameLevelAbove();
//_loggerDelegate?.Invoke($"{nameof(ZyreNode)}.{nameof(RequirePeer)}() called by {callingMethod2} creating new peer with uuidShort={uuid.ToShortString6()}");
_loggerDelegate?.Invoke($"{nameof(ZyreNode)}.{nameof(RequirePeer)}() creating new peer with uuidShort={uuid.ToShortString6()}");
peer = ZyrePeer.NewPeer(_peers, uuid, _loggerDelegate);
peer.Origin = _name;
peer.Connect(_uuid, endpoint);
// Handshake discovery by sending HELLO as first message
var helloMessage = new ZreMsg
{
Id = ZreMsg.MessageId.Hello,
Hello =
{
Endpoint = _endpoint,
Groups = _ownGroups.Keys.ToList(),
Status = _status,
Name = _name,
Headers = _headers
}
};
//_loggerDelegate?.Invoke($"{nameof(ZyreNode)}.{nameof(RequirePeer)}() called by {callingMethod2} created new peer={peer}. Sending Hello message...");
_loggerDelegate?.Invoke($"{nameof(ZyreNode)}.{nameof(RequirePeer)}() created new peer={peer}. Sending Hello message...");
peer.Send(helloMessage);
return(peer);
}
/// <summary>
/// We do this once a second:
/// - if peer has gone quiet, send TCP ping and emit EVASIVE event
/// - if peer has disappeared, expire it
/// </summary>
/// <param name="peer">the peer to ping</param>
/// <returns>true if this peer should be removed</returns>
private bool PingPeer(ZyrePeer peer)
{
if (!_isRunning)
{
// We have been stopped. We know longer can communicate to peers.
return true;
}
if (DateTime.Now >= peer.ExpiredAt)
{
return true;
}
if (DateTime.Now >= peer.EvasiveAt)
{
// If peer is being evasive, force a TCP ping.
// ZeroMQTODO: do this only once for a peer in this state;
// it would be nicer to use a proper state machine
// for peer management.
_loggerDelegate?.Invoke($"Peer seems dead/slow: name={peer.Name} endpoint={peer.Endpoint}");
ZreMsg.SendPing(_outbox, 0);
// Inform the calling application this peer is being evasive
_outbox.SendMoreFrame("EVASIVE");
_outbox.SendMoreFrame(peer.Uuid.ToByteArray());
_outbox.SendFrame(peer.Name);
}
return false;
}
/// <summary>
/// Have peer leave group
/// </summary>
/// <param name="peer"></param>
/// <param name="groupName"></param>
/// <returns></returns>
private void LeavePeerGroup(ZyrePeer peer, string groupName)
{
var group = RequirePeerGroup(groupName);
group.Leave(peer);
// Now tell the caller about the peer left group
_outbox.SendMoreFrame("LEAVE").SendMoreFrame(peer.Uuid.ToByteArray()).SendMoreFrame(peer.Name).SendFrame(groupName);
_loggerDelegate?.Invoke($"LEAVE name={peer.Name} group={groupName}");
}
/// <summary>
/// Join peer to group
/// </summary>
/// <param name="peer">The peer that is joining this group</param>
/// <param name="groupName">The name of the group to join</param>
/// <returns>the group joined</returns>
private void JoinPeerGroup(ZyrePeer peer, string groupName)
{
var group = RequirePeerGroup(groupName);
group.Join(peer);
// Now tell the caller about the peer joined group
_outbox.SendMoreFrame("JOIN").SendMoreFrame(peer.Uuid.ToByteArray()).SendMoreFrame(peer.Name).SendFrame(groupName);
_loggerDelegate?.Invoke($"JOIN name={peer.Name} group={groupName}");
}
/// <summary>
/// Remove a peer from our data structures
/// </summary>
/// <param name="peer"></param>
private void RemovePeer(ZyrePeer peer)
{
// Tell the calling application the peer has gone
_outbox.SendMoreFrame("EXIT").SendMoreFrame(peer.Uuid.ToByteArray()).SendFrame(peer.Name);
_loggerDelegate?.Invoke($"EXIT name={peer.Name} endpoint={peer.Endpoint}");
// Remove peer from any groups we've got it in
foreach (var peerGroup in _peerGroups.Values)
{
RemovePeerFromGroup(peerGroup, peer);
}
_peers.Remove(peer.Uuid);
peer.Destroy();
}
/// <summary>
/// Remove peer from group, if it's a member
/// </summary>
/// <param name="group"></param>
/// <param name="peer"></param>
private void RemovePeerFromGroup(ZyreGroup group, ZyrePeer peer)
{
group.Leave(peer);
}
/// <summary>
/// Delete peer for a given endpoint
/// </summary>
/// <param name="peer"></param>
/// <param name="endpoint"></param>
private void PurgePeer(ZyrePeer peer, string endpoint)
{
if (peer.Endpoint == endpoint)
{
peer.Disconnect();
}
}
/// <summary>
/// Add peer to group
/// Ignore duplicate joins
/// </summary>
/// <param name="peer"></param>
internal void Join(ZyrePeer peer)
{
_peers[peer.Uuid] = peer;
peer.IncrementStatus();
}
/// <summary>
/// Remove peer from group
/// </summary>
/// <param name="peer"></param>
internal void Leave(ZyrePeer peer)
{
_peers.Remove(peer.Uuid);
peer.IncrementStatus();
}
/// <summary>
/// Remove peer from group
/// </summary>
/// <param name="peer"></param>
internal void Leave(ZyrePeer peer)
{
_peers.Remove(peer.Uuid);
peer.IncrementStatus();
}
// /// <summary>
// /// Return a string showing the class name and method of method calling the method calling this method, used for reporting errors
// /// </summary>
// /// <returns>the name of the calling method</returns>
// private static string MethodNameLevelAbove()
// {
// var stackTrace = new System.Diagnostics.StackTrace(new Exception(), false);
// var stackFrame = stackTrace.GetFrames()[2];
// var mb = stackFrame.GetMethod();
// return mb.ReflectedType.Name + ":" + mb.Name + "()";
// }
/// <summary>
/// Remove peer from group, if it's a member
/// </summary>
/// <param name="group"></param>
/// <param name="peer"></param>
private void RemovePeerFromGroup(ZyreGroup group, ZyrePeer peer)
{
group.Leave(peer);
}
/// <summary>
/// Construct new ZyrePeer object
/// </summary>
/// <param name="container">The dictionary of peers</param>
/// <param name="guid">The identity for this peer</param>
/// <param name="loggerDelegate">An action to take for logging when _verbose is true. Default is null.</param>
/// <returns></returns>
internal static ZyrePeer NewPeer(Dictionary<Guid, ZyrePeer> container, Guid guid, Action<string> loggerDelegate = null)
{
var peer = new ZyrePeer(guid, loggerDelegate);
container[guid] = peer; // overwrite any existing entry for same uuid
return peer;
}
/// <summary>
/// Add peer to group
/// Ignore duplicate joins
/// </summary>
/// <param name="peer"></param>
internal void Join(ZyrePeer peer)
{
_peers[peer.Uuid] = peer;
peer.IncrementStatus();
}
