Merge pull request #110 from lightninglabs/rpc-debug-logs

wasm: detailed rpc logs

Author: jbrill

cmd/wasm-client/main.go

@@ -326,11 +326,15 @@ func (w *wasmClient) Status(_ js.Value, _ []js.Value) interface{} {
 
 func (w *wasmClient) InvokeRPC(_ js.Value, args []js.Value) interface{} {
 	if len(args) != 3 {
+		log.Errorf("Invalid use of wasmClientInvokeRPC, need 3 "+
+			"parameters: rpcName, request, callback")
 		return js.ValueOf("invalid use of wasmClientInvokeRPC, " +
 			"need 3 parameters: rpcName, request, callback")
 	}
 
 	if w.lndConn == nil {
+		log.Errorf("Attempted to invoke RPC but connection is not "+
+			"ready")
 		return js.ValueOf("RPC connection not ready")
 	}
 
@@ -340,16 +344,29 @@ func (w *wasmClient) InvokeRPC(_ js.Value, args []js.Value) interface{} {
 
 	method, ok := w.registry[rpcName]
 	if !ok {
+		log.Errorf("RPC method '%s' not found in registry", rpcName)
 		return js.ValueOf("rpc with name " + rpcName + " not found")
 	}
 
 	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				errMsg := fmt.Sprintf("Panic in RPC call: "+
+					"%v", r)
+				log.Errorf("%s\n%s", errMsg, debug.Stack())
+				jsCallback.Invoke(js.ValueOf(errMsg))
+			}
+		}()
+
 		log.Infof("Calling '%s' on RPC with request %s",
 			rpcName, requestJSON)
 		cb := func(resultJSON string, err error) {
 			if err != nil {
+				log.Errorf("RPC '%s' failed: %v", rpcName, err)
 				jsCallback.Invoke(js.ValueOf(err.Error()))
 			} else {
+				log.Debugf("RPC '%s' succeeded with result: %s",
+					rpcName, resultJSON)
 				jsCallback.Invoke(js.ValueOf(resultJSON))
 			}
 		}
@@ -358,7 +375,6 @@ func (w *wasmClient) InvokeRPC(_ js.Value, args []js.Value) interface{} {
 		<-ctx.Done()
 	}()
 	return nil
-
 }
 
 func (w *wasmClient) GetExpiry(_ js.Value, _ []js.Value) interface{} {