Add "ping" message to the websocket interface #238

docs/api.md

@@ -579,6 +579,7 @@ The websocket interface provides the following requests:
 - getTransactionSpecific
 - estimateFee
 - sendTransaction
+- ping
 
 The client can subscribe to the following events:
 

server/public_test.go

@@ -949,6 +949,13 @@ func websocketTestsBitcoinType(t *testing.T, ts *httptest.Server) {
 			},
 			want: `{"id":"15","data":{"subscribed":false}}`,
 		},
+		{
+			name: "websocket ping",
+			req: websocketReq{
+				Method: "ping",
+			},
+			want: `{"id":"16","data":{}}`,
+		},
 	}
 
 	// send all requests at once

server/websocket.go

@@ -298,6 +298,10 @@ var requestHandlers = map[string]func(*WebsocketServer, *websocketChannel, *webs
 	"unsubscribeAddresses": func(s *WebsocketServer, c *websocketChannel, req *websocketReq) (rv interface{}, err error) {
 		return s.unsubscribeAddresses(c)
 	},
+	"ping": func(s *WebsocketServer, c *websocketChannel, req *websocketReq) (rv interface{}, err error) {
+		r := struct{}{}
+		return r, nil
+	},
 }
 
 func sendResponse(c *websocketChannel, req *websocketReq, data interface{}) {

static/test-websocket.html

@@ -104,6 +104,15 @@
             });
         }
 
+        function ping() {
+            const method = 'ping';
+            const params = {
+            };
+            send(method, params, function (result) {
+                document.getElementById('pingResult').innerText = JSON.stringify(result).replace(/,/g, ", ");
+            });
+        }
+
         function getBlockHash() {
             const method = 'getBlockHash';
             const height = parseInt(document.getElementById("getBlockHashHeight").value);
@@ -296,6 +305,13 @@
             <div class="col-10" id="getInfoResult">
             </div>
         </div>
+        <div class="row">
+            <div class="col">
+                <input class="btn btn-secondary" type="button" value="ping" onclick="ping()">
+            </div>
+            <div class="col-10" id="pingResult">
+            </div>
+        </div>
         <div class="row">
             <div class="col">
                 <input class="btn btn-secondary" type="button" value="getBlockHash" onclick="getBlockHash()">