node-SDK: add multi-callback registrations

This patch allows the sdk to handle multiple registrations
on the same event criteria. It also enables registrations for
all events for a particular chaincode.

Change-Id: I2caa60e0080a8b41e9a8bf5d61ae671eaf09814a
Signed-off-by: Patrick Mullaney <pm.mullaney@gmail.com>

sdk/node/src/hfc.ts

@@ -2842,15 +2842,16 @@ export function newFileKeyValStore(dir:string):KeyValStore {
 /**
  * The ChainCodeCBE is used internal to the EventHub to hold chaincode event registration callbacks.
  */
-class ChainCodeCBE {
+export class ChainCodeCBE {
+    // chaincode id
     ccid: string;
-    eventname: string;
-    payload: Uint8Array;
+    // event name regex filter
+    eventNameFilter: RegExp;
+    // callback function to invoke on successful filter match
     cb: Function;
-    constructor(ccid: string,eventname: string,payload: Uint8Array, cb: Function) {
+    constructor(ccid: string, eventNameFilter: string, cb: Function) {
         this.ccid = ccid;
-        this.eventname = eventname;
-        this.payload = payload;
+        this.eventNameFilter = new RegExp(eventNameFilter);
         this.cb = cb;
     }
 }
@@ -2879,7 +2880,7 @@ export class EventHub {
 	this.chaincodeRegistrants = new HashTable();
 	this.blockRegistrants = new Set();
 	this.txRegistrants = new HashTable();
-        this.peeraddr = "localhost:7053";
+        this.peeraddr = null;
         this.connected = false;
     }
 
@@ -2893,6 +2894,7 @@ export class EventHub {
 
     public connect() {
         if (this.connected) return;
+	if (!this.peeraddr) throw Error("Must set peer address before connecting.");
         this.events = grpc.load(__dirname + "/protos/events.proto" ).protos;
 	this.client = new this.events.Events(this.peeraddr,grpc.credentials.createInsecure());
 	this.call = this.client.chat();
@@ -2902,11 +2904,15 @@ export class EventHub {
 	let eh = this; // for callback context
         this.call.on('data', function(event) {
 		if ( event.Event == "chaincodeEvent" ) {
-			var cbe = eh.chaincodeRegistrants.get(event.chaincodeEvent.chaincodeID + "/" + event.chaincodeEvent.eventName);
-			if ( cbe ) {
-			    cbe.payload = event.chaincodeEvent.payload;
-			    cbe.cb(cbe);
-			}
+			var cbtable = eh.chaincodeRegistrants.get(event.chaincodeEvent.chaincodeID);
+                        if( !cbtable ) {
+                            return;
+                        }
+                        cbtable.forEach(function (cbe) {
+                            if ( cbe.eventNameFilter.test(event.chaincodeEvent.eventName)) {
+                                cbe.cb(event.chaincodeEvent);
+                            }
+                        });
 		} else if ( event.Event == "block") {
 			eh.blockRegistrants.forEach(function(cb){
                             cb(event.block);
@@ -2928,19 +2934,35 @@ export class EventHub {
         this.connected = false;
     }
 
-    public registerChaincodeEvent(ccid: string, eventname: string, callback: Function){
+    public registerChaincodeEvent(ccid: string, eventname: string, callback: Function): ChainCodeCBE {
         if (!this.connected) return;
-	let cb = new ChainCodeCBE(ccid, eventname, null, callback);
-	let register = { register: { events: [ { eventType: "CHAINCODE", chaincodeRegInfo:{ chaincodeID: ccid , eventName: eventname }} ] }};
-	this.chaincodeRegistrants.put(ccid + "/" + eventname, cb);
-	this.call.write(register);
+	let cb = new ChainCodeCBE(ccid, eventname, callback);
+	let cbtable = this.chaincodeRegistrants.get(ccid);
+        if ( !cbtable ) {
+	    cbtable = new Set();
+	    this.chaincodeRegistrants.put(ccid, cbtable);
+            cbtable.add(cb);
+	    let register = { register: { events: [ { eventType: "CHAINCODE", chaincodeRegInfo:{ chaincodeID: ccid , eventName: "" }} ] }};
+	    this.call.write(register);
+        } else {
+            cbtable.add(cb);
+        }
+        return cb;
     }
 
-    public unregisterChaincodeEvent(ccid: string, eventname: string){
+    public unregisterChaincodeEvent(cbe: ChainCodeCBE){
         if (!this.connected) return;
-	var unregister = { unregister: { events: [ { eventType: "CHAINCODE", chaincodeRegInfo:{ chaincodeID: ccid, eventName: eventname }} ] }};
-	this.chaincodeRegistrants.remove(ccid + "/" + eventname);
-	this.call.write(unregister);
+        let cbtable = this.chaincodeRegistrants.get(cbe.ccid);
+        if ( !cbtable ) {
+            debug("No event registration for ccid %s ", cbe.ccid);
+            return;
+        }
+        cbtable.delete(cbe);
+        if( cbtable.size <= 0 ) {
+	    var unregister = { unregister: { events: [ { eventType: "CHAINCODE", chaincodeRegInfo:{ chaincodeID: cbe.ccid, eventName: "" }} ] }};
+	    this.chaincodeRegistrants.remove(cbe.ccid);
+	    this.call.write(unregister);
+        }
     }
 
     public registerBlockEvent(callback:Function){