#--------------------------------------------------------------------------- # # Title : EMESARY multiplayer bridge # # File Type : Implementation File # # Description : Bridges selected emesary notifications over MP # : To send a message use a Transmitter with an object. That's all there is to it. # # References : http://chateau-logic.com/content/emesary-nasal-implementation-flightgear # # Author : Richard Harrison (richard@zaretto.com) # # Creation Date : 04 April 2016 # # Version : 4.8 # # Copyright © 2016 Richard Harrison Released under GPL V2 # #---------------------------------------------------------------------------*/ # Example of connecting an incoming and outgoing bridge (should reside inside an aircraft nasal file) # # var routedNotifications = [notifications.TacticalNotification.new(nil)]; # var incomingBridge = emesary_mp_bridge.IncomingMPBridge.startMPBridge(routedNotifications); # var outgoingBridge = emesary_mp_bridge.OutgoingMPBridge.new("F-15mp",routedNotifications); #------------------------------------------------------------------ # # NOTES: Aircraft do not need to have both an incoming and outgoing bridge, but it is usual. # Only the notifications specified will be routed via the bridge. # Once routed a message will by default not be re-rerouted again by the outgoing bridge. # Transmit frequency and message lifetime may need to be tuned. # IsDistinct messages must be absolute and self contained as a later message will # supercede any earlier ones in the outgoing queue (possibly prior to receipt) # Use the message type and ident to identify distinct messages # The outgoing 'port' is a multiplay/emesary/bridge index, however any available string property # can be used by specifying it in the construction of the incoming or outgoing bridge. # NOTE: This should not often be changed as it different versions of FG or model will # have to use the same properties to be able to communicate # multiplay/emesary/bridge-type is used to identify the bridge that is in use. This is to # protect against bridges being used for different purposes by different models. # The bridge-type property should contain an ID that identifies the purpose # and thereore the message set that the bridge will be using. # - ! is used as a seperator between the elements that are used to send the # notification (typeid, sequence, notification) # - There is an extra ! at the start of the message that is used to indicate protocol version. # - ; is used to seperate serialzied elemnts of the notification # General Notes #---------------------------------------------------------------------- # Outgoing messages are sent in a scheduled manner, usually once per # second, and each message has a lifetime (to allow for propogation to # all clients over UDP). Clients will ignore messages that they have # already received (based on the sequence id). # The incoming bridge will usually be created part of the aircraft # model file; it is important to understand that each AI/MP model will # have an incoming bridge as each element in /ai/models needs its own # bridge to keep up with the incoming sequence id. This scheme may not # work properly as it relies on the model being loaded which may only # happen when visible so it may be necessary to track AI models in a # seperate instantiatable incoming bridge manager. # # The outgoing bridge would usually be created within the aircraft loading Nasal. var EmesaryMPBridgeDefaultPropertyIndex=19; var OutgoingMPBridge = { SeperatorChar : "!", MessageEndChar : "~", StartMessageIndex : 11, DefaultMessageLifetimeSeconds : 10, MPStringMaxLen: 128, new: func(_ident, _notifications_to_bridge=nil, _mpidx=19, _root="", _transmitter=nil, _propertybase="emesary/bridge") { if (_transmitter == nil) _transmitter = emesary.GlobalTransmitter; print("OutgoingMPBridge created for "~_ident," mp=",_mpidx); var new_class = emesary.Recipient.new("OutgoingMPBridge "~_ident); if(_notifications_to_bridge == nil) new_class.NotificationsToBridge = []; else new_class.NotificationsToBridge = _notifications_to_bridge; new_class.NotificationsToBridge_Lookup = {}; foreach(var n ; new_class.NotificationsToBridge) { print(" ",_ident," outwards bridge[",n,"] notifications of type --> ",n.NotificationType, " Id ",n.TypeId); n.MessageIndex = OutgoingMPBridge.StartMessageIndex; new_class.NotificationsToBridge_Lookup[n.TypeId] = n; } new_class.MPout = ""; new_class.MPidx = _mpidx; new_class.MessageLifeTime = 10; # seconds new_class.OutgoingList = []; new_class.Transmitter = _transmitter; new_class.TransmitRequired=0; new_class.Transmitter.Register(new_class); new_class.MpVariable = _root~"sim/multiplay/"~_propertybase~"["~new_class.MPidx~"]"; new_class.TransmitterActive = 0; new_class.TransmitFrequencySeconds = 1; new_class.trace = 0; new_class.MPStringMaxLen = OutgoingMPBridge.MPStringMaxLen; new_class.TransmitTimer = maketimer(6, func { if(new_class.TransmitterActive) new_class.Transmit(); new_class.TransmitTimer.restart(new_class.TransmitFrequencySeconds); }); new_class.Delete = func { if (me.Transmitter != nil) { me.Transmitter.DeRegister(me); me.Transmitter = nil; } }; new_class.AddMessage = func(m) { append(me.NotificationsToBridge, m); }; #------------------------------------------- # Receive override: new_class.Receive = func(notification) { if (notification.FromIncomingBridge) return emesary.Transmitter.ReceiptStatus_NotProcessed; #print("Receive ",notification.NotificationType," ",notification.Ident); for (var idx = 0; idx < size(me.NotificationsToBridge); idx += 1) { if(me.NotificationsToBridge[idx].NotificationType == notification.NotificationType) { me.NotificationsToBridge[idx].MessageIndex += 1; notification.MessageExpiryTime = systime()+me.MessageLifeTime; notification.Expired = 0; notification.BridgeMessageId = me.NotificationsToBridge[idx].MessageIndex; notification.BridgeMessageNotificationTypeId = me.NotificationsToBridge[idx].TypeId; # # The message key is a composite of the type and ident to allow for multiple senders # of the same message type. #print("Received ",notification.BridgeMessageNotificationTypeKey," expire=",notification.MessageExpiryTime); me.AddToOutgoing(notification); return emesary.Transmitter.ReceiptStatus_Pending; } } return emesary.Transmitter.ReceiptStatus_NotProcessed; }; new_class.AddToOutgoing = func(notification) { if (notification.IsDistinct) { for (var idx = 0; idx < size(me.OutgoingList); idx += 1) { if (me.trace) print("Compare [",idx,"] qId=",me.OutgoingList[idx].GetBridgeMessageNotificationTypeKey() ," noti --> ",notification.GetBridgeMessageNotificationTypeKey()); if(me.OutgoingList[idx].GetBridgeMessageNotificationTypeKey() == notification.GetBridgeMessageNotificationTypeKey()) { if (me.trace) print(" --> Update ",me.OutgoingList[idx].GetBridgeMessageNotificationTypeKey() ," noti --> ",notification.GetBridgeMessageNotificationTypeKey()); me.OutgoingList[idx]= notification; me.TransmitterActive = size(me.OutgoingList); return; } } } else if (me.trace) print("Not distinct, adding always"); if (me.trace) print(" --> Added ",notification.GetBridgeMessageNotificationTypeKey()); append(me.OutgoingList, notification); me.TransmitterActive = size(me.OutgoingList); }; new_class.Transmit = func { var outgoing = ""; var cur_time=systime(); for (var idx = 0; idx < size(me.OutgoingList); idx += 1) { var sect = ""; var notification = me.OutgoingList[idx]; if (!notification.Expired and notification.MessageExpiryTime > cur_time) { var encval=""; var first_time = 1; var eidx = 0; notification.Expired = 0; foreach(var p ; notification.bridgeProperties()) { var nv = p.getValue(); encval = encval ~ nv; eidx += 1; } # !idx!typ!encv~ sect = sprintf("%s%s%s%s%s%s%s", OutgoingMPBridge.SeperatorChar, emesary.BinaryAsciiTransfer.encodeInt(notification.BridgeMessageId,4), OutgoingMPBridge.SeperatorChar, emesary.BinaryAsciiTransfer.encodeInt(notification.BridgeMessageNotificationTypeId,1), OutgoingMPBridge.SeperatorChar, encval, OutgoingMPBridge.MessageEndChar); if (size(outgoing) + size(sect) < me.MPStringMaxLen) { outgoing = outgoing~sect; } else { print("Emesary: ERROR [",me.Ident,"] out of space for ",notification.NotificationType, " transmitted count=",idx, " queue size ",size(me.OutgoingList)); notification.MessageExpiryTime = systime()+me.MessageLifeTime; break; } } else { notification.Expired = 1; } } me.TransmitterActive = size(me.OutgoingList); setprop(me.MpVariable,outgoing); # print("Set ",me.MpVariable," size(",size(outgoing)); #loopback test: # incomingBridge.ProcessIncoming(outgoing); # # Now remove any expired messages from the outgoing queue. # The only real way of doing this is via the pop() function # so we have to delete the expired items from the list by rebuilding # the list from the start with non-expired items, and then # all of the items past the end (of the rebuilt list) can be popped # (pop removes the last element from a vector) var outSize = size(me.OutgoingList)-1; var out_idx = 0; for (var idx = 0; idx <= outSize; idx += 1) { #print("Q1 [",idx,"] ",me.OutgoingList[idx].MessageExpiryTime-cur_time," Expired=",me.OutgoingList[idx].Expired); if(!me.OutgoingList[idx].Expired) { #print("move ",idx, " => ",out_idx); var mmove = me.OutgoingList[idx]; me.OutgoingList[out_idx] = me.OutgoingList[idx]; out_idx += 1; } } var to_del = (outSize+1) - out_idx; #print("--> out idx",out_idx, " to delete ",to_del); while(to_del > 0) { #print("--> pop "); pop(me.OutgoingList); to_del = to_del - 1; } }; new_class.TransmitTimer.restart(new_class.TransmitFrequencySeconds); return new_class; }, }; # # # one of these for each model instantiated in the model XML - it will # route messages to var IncomingMPBridge = { trace : 0, new: func(_ident, _notifications_to_bridge=nil, _mpidx=19, _transmitter=nil, _propertybase="emesary/bridge") { if (_transmitter == nil) _transmitter = emesary.GlobalTransmitter; print("IncomingMPBridge created for "~_ident," mp=",_mpidx, " using Transmitter ",_transmitter.Ident, " with property base sim/multiplayer/"~_propertybase); var new_class = emesary.Transmitter.new("IncominggMPBridge "~_ident); if(_notifications_to_bridge == nil) new_class.NotificationsToBridge = []; else new_class.NotificationsToBridge = _notifications_to_bridge; new_class.NotificationsToBridge_Lookup = {}; foreach(var n ; new_class.NotificationsToBridge) { print(" Incoming bridge notification type --> ",n.NotificationType); new_class.NotificationsToBridge_Lookup[n.TypeId] = n; } new_class.MPout = ""; new_class.MPidx = _mpidx; new_class.MPpropertyBase = _propertybase; new_class.MessageLifeTime = OutgoingMPBridge.DefaultMessageLifetimeSeconds; # seconds new_class.OutgoingList = []; new_class.Transmitter = _transmitter; new_class.MpVariable = ""; new_class.Connect = func(_root) { me.MpVariable = _root~"sim/multiplay/"~new_class.MPpropertyBase~"["~new_class.MPidx~"]"; me.CallsignPath = _root~"callsign"; me.PropertyRoot = _root; me.IncomingMessageIndex = OutgoingMPBridge.StartMessageIndex; setlistener(me.MpVariable, func(v) { #print("incoming ",getprop(me.CallsignPath)," -->",me.PropertyRoot," v=",v.getValue()); me.ProcessIncoming(v.getValue()); }); }; new_class.setprop = func(property, value){ if (IncomingMPBridge.trace == 2) print("setprop ",new_class.PropertyRoot~property," = ",value); setprop(new_class.PropertyRoot~property,value); }; new_class.GetCallsign = func { return getprop(me.CallsignPath); }; new_class.AddMessage = func(m) { append(me.NotificationsToBridge, m); }; new_class.Remove = func { print("Emesary IncomingMPBridge Remove() ",me.Ident); me.Transmitter.DeRegister(me); }; #------------------------------------------- # Receive override: new_class.ProcessIncoming = func(encoded_val) { if (encoded_val == "") return; var encoded_notifications = split(OutgoingMPBridge.MessageEndChar, encoded_val); for (var idx = 0; idx < size(encoded_notifications); idx += 1) { if (encoded_notifications[idx] == "") continue ; # get the message parts var encoded_notification = split(OutgoingMPBridge.SeperatorChar, encoded_notifications[idx]); if (size(encoded_notification) < 4) print("Error: emesary.IncomingBridge.ProcessIncoming bad msg ",encoded_notifications[idx]); else { var msg_idx = emesary.BinaryAsciiTransfer.decodeInt(encoded_notification[1],4,0).value; var msg_type_id = emesary.BinaryAsciiTransfer.decodeInt(encoded_notification[2],1,0).value; var bridged_notification = new_class.NotificationsToBridge_Lookup[msg_type_id]; if (bridged_notification == nil) { print("Error: emesary.IncomingBridge.ProcessIncoming invalid type_id ",msg_type_id); } else { bridged_notification.FromIncomingBridge = 1; bridged_notification.Callsign = me.GetCallsign(); if(IncomingMPBridge.trace) print("ProcessIncoming ",bridged_notification.Callsign," ",me.PropertyRoot, "idx=",msg_idx, " bridge_idx=",me.IncomingMessageIndex); if (msg_idx > me.IncomingMessageIndex) { var msg_body = encoded_notification[3]; if (IncomingMPBridge.trace > 2) print("received idx=",msg_idx," ",msg_type_id,":",bridged_notification.NotificationType); # populate fields var bridgedProperties = bridged_notification.bridgeProperties(); var msglen = size(msg_body); if (IncomingMPBridge.trace > 2) print("Process ",msg_body," len=",msglen, " BPsize = ",size(bridgedProperties)); var pos = 0; for (var bpi = 0; bpi < size(bridgedProperties); bpi += 1) { if (pos < msglen) { if (IncomingMPBridge.trace > 2) print("dec: pos ",pos); var bp = bridgedProperties[bpi]; dv = bp.setValue(msg_body, me, pos); if (IncomingMPBridge.trace > 2) print(" --> next pos ",pos); if (dv.pos == pos or dv.pos > msglen) break; pos = dv.pos; } else { print("Error: emesary.IncomingBridge.ProcessIncoming: [",bridged_notification.NotificationType,"] supplementary encoded value at position ",bpi); break; } } # maybe extend the bridge to allow certain notifications to only be routed to a specific player; # i.e. # (notification.Callsign == nil or notification.Callsign == getprop("/sim/multiplay/callsign")) if (bridged_notification.Ident == "none") bridged_notification.Ident = "mp-bridge"; me.Transmitter.NotifyAll(bridged_notification); me.IncomingMessageIndex = msg_idx; } } } } } foreach (var n; new_class.NotificationsToBridge) { print("IncomingBridge: ",n.NotificationType); } return new_class; } , # # Each multiplayer object will have its own incoming bridge. This is necessary to allow message ID # tracking (as the bridge knows which messages have been already processed) # Whenever a client connects over MP a new bridge is instantiated startMPBridge : func(notification_list, mpidx=19, transmitter=nil, _propertybase="emesary/bridge") { var incomingBridgeList = {}; # # Create bridge whenever a client connects # setlistener("/ai/models/model-added", func(v) { # Model added will be eg: /ai[0]/models[0]/multiplayer[0] var path = v.getValue(); # Ensure we only handle multiplayer elements if (find("/multiplayer",path) > 0) { var callsign = getprop(path~"/callsign"); print("Creating Emesary MPBridge for ",path); if (callsign == "" or callsign == nil) callsign = path; var incomingBridge = emesary_mp_bridge.IncomingMPBridge.new(path, notification_list, mpidx, transmitter, _propertybase); incomingBridge.Connect(path~"/"); incomingBridgeList[path] = incomingBridge; } }); # # when a client disconnects remove the associated bridge. # setlistener("/ai/models/model-removed", func(v){ var path = v.getValue(); var bridge = incomingBridgeList[path]; if (bridge != nil) { # print("Bridge removed for ",v.getValue()); bridge.Remove(); incomingBridgeList[path]=nil; } }); }, };