Closed endpoint connection should be removed from agent endpoint table.

lib/http.js

@@ -943,6 +943,7 @@ Agent.prototype.request = function request(options, callback) {
       port: options.port,
       localAddress: options.localAddress
     });
+    var self = this;
 
     endpoint.socket.on('error', function (error) {
       self._log.error('Socket error: ' + error.toString());
@@ -954,6 +955,10 @@ Agent.prototype.request = function request(options, callback) {
       request.emit('error', error);
     });
 
+    endpoint.on('closed', function () {
+      delete self.endpoints[key];
+    });
+
     this.endpoints[key] = endpoint;
     endpoint.pipe(endpoint.socket).pipe(endpoint);
     request._start(endpoint.createStream(), options);
@@ -1011,6 +1016,9 @@ Agent.prototype.request = function request(options, callback) {
           self._log.info({ e: endpoint, server: options.host + ':' + options.port },
                          'New outgoing HTTP/2 connection');
           self.endpoints[key] = endpoint;
+          endpoint.on('closed', function () {
+            delete self.endpoints[key];
+          });
           self.emit(key, endpoint);
         } else {
           self.emit(key, undefined);

lib/protocol/connection.js

@@ -574,6 +574,7 @@ Connection.prototype.close = function close(error) {
   });
   this.push(null);
   this._closed = true;
+  this.emit('closed');
 };
 
 Connection.prototype._receiveGoaway = function _receiveGoaway(frame) {
@@ -583,6 +584,7 @@ Connection.prototype._receiveGoaway = function _receiveGoaway(frame) {
   if (frame.error !== 'NO_ERROR') {
     this.emit('peerError', frame.error);
   }
+  this.emit('closed');
 };
 
 // Flow control

lib/protocol/endpoint.js

@@ -233,8 +233,8 @@ Endpoint.prototype._initializeErrorHandling = function _initializeErrorHandling(
   this._compressor.on('error', this._error.bind(this, 'compressor'));
   this._decompressor.on('error', this._error.bind(this, 'decompressor'));
   this._connection.on('error', this._error.bind(this, 'connection'));
-
   this._connection.on('peerError', this.emit.bind(this, 'peerError'));
+  this._connection.on('closed', this.emit.bind(this, 'closed'));
 };
 
 Endpoint.prototype._error = function _error(component, error) {

test/connection.js

@@ -232,6 +232,12 @@ describe('connection.js', function() {
 
         c.close();
       });
+      it('should emit an event', function(done) {
+        c.on('closed', function () {
+          done();
+        });
+        c.close();
+      });
     });
   });
 });

test/endpoint.js

@@ -26,6 +26,17 @@ describe('endpoint.js', function() {
       });
     });
   });
+  describe('connection closing', function() {
+    describe('closing the endpoint connection', function() {
+      it('should emit an event', function(done) {
+        var c = new Endpoint(util.log.child({ role: 'client' }), 'CLIENT', settings);
+        c.on('closed', function () {
+          done();
+        });
+        c.close();
+      });
+    });
+  });
   describe('bunyan serializer', function() {
     describe('`e`', function() {
       var format = endpoint.serializers.e;