rpcclient: Implement fmt.Stringer for Client

rpcclient/infrastructure.go

@@ -161,6 +161,25 @@ type Client struct {
 	wg              sync.WaitGroup
 }
 
+// String implements fmt.Stringer by returning the URL of the RPC server the
+// client makes requests to.
+func (c *Client) String() string {
+	var u url.URL
+	switch {
+	case c.config.HTTPPostMode && c.config.DisableTLS:
+		u.Scheme = "http"
+	case c.config.HTTPPostMode:
+		u.Scheme = "https"
+	case c.config.DisableTLS:
+		u.Scheme = "ws"
+	default:
+		u.Scheme = "wss"
+	}
+	u.Host = c.config.Host
+	u.Path = c.config.Endpoint
+	return u.String()
+}
+
 // NextID returns the next id to be used when sending a JSON-RPC message.  This
 // ID allows responses to be associated with particular requests per the
 // JSON-RPC specification.  Typically the consumer of the client does not need

rpcclient/infrastructure_test.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2018 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package rpcclient
+
+import "testing"
+
+func TestClientStringer(t *testing.T) {
+	type test struct {
+		url      string
+		host     string
+		endpoint string
+		post     bool
+	}
+	tests := []test{
+		{"https://localhost:9109", "localhost:9109", "", true},
+		{"wss://localhost:9109/ws", "localhost:9109", "ws", false},
+	}
+	for _, test := range tests {
+		cfg := &ConnConfig{
+			Host:                test.host,
+			Endpoint:            test.endpoint,
+			HTTPPostMode:        test.post,
+			DisableTLS:          false,
+			DisableConnectOnNew: true,
+		}
+		c, err := New(cfg, nil)
+		if err != nil {
+			t.Errorf("%v rpcclient.New: %v", test.url, err)
+			continue
+		}
+		s := c.String()
+		if s != test.url {
+			t.Errorf("Expected %q, got %q", test.url, s)
+		}
+	}
+}