rpc: fix RPC client doesn't handle url's without ports (#6507)

rpc/jsonrpc/client/http_json_client.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"net/url"
 	"strings"
+	"time"
 
 	tmsync "github.com/tendermint/tendermint/internal/libs/sync"
 	types "github.com/tendermint/tendermint/rpc/jsonrpc/types"
@@ -370,6 +371,7 @@ func makeHTTPDialer(remoteAddr string) (func(string, string) (net.Conn, error),
 	}
 
 	protocol := u.Scheme
+	padding := u.Scheme
 
 	// accept http(s) as an alias for tcp
 	switch protocol {
@@ -378,7 +380,13 @@ func makeHTTPDialer(remoteAddr string) (func(string, string) (net.Conn, error),
 	}
 
 	dialFn := func(proto, addr string) (net.Conn, error) {
-		return net.Dial(protocol, u.GetDialAddress())
+		var timeout = 10 * time.Second
+		if !u.isUnixSocket && strings.LastIndex(u.Host, ":") == -1 {
+			u.Host = fmt.Sprintf("%s:%s", u.Host, padding)
+			return net.DialTimeout(protocol, u.GetDialAddress(), timeout)
+		}
+
+		return net.DialTimeout(protocol, u.GetDialAddress(), timeout)
 	}
 
 	return dialFn, nil

rpc/jsonrpc/client/http_json_client_test.go

@@ -84,3 +84,31 @@ func Test_parsedURL(t *testing.T) {
 		})
 	}
 }
+
+func TestMakeHTTPDialerURL(t *testing.T) {
+	remotes := []string{"https://foo-bar.com", "http://foo-bar.com"}
+
+	for _, remote := range remotes {
+		u, err := newParsedURL(remote)
+		require.NoError(t, err)
+		dialFn, err := makeHTTPDialer(remote)
+		require.Nil(t, err)
+
+		addr, err := dialFn(u.Scheme, u.GetHostWithPath())
+		require.NoError(t, err)
+		require.NotNil(t, addr)
+	}
+
+	errorURLs := []string{"tcp://foo-bar.com", "ftp://foo-bar.com"}
+
+	for _, errorURL := range errorURLs {
+		u, err := newParsedURL(errorURL)
+		require.NoError(t, err)
+		dialFn, err := makeHTTPDialer(errorURL)
+		require.Nil(t, err)
+
+		addr, err := dialFn(u.Scheme, u.GetHostWithPath())
+		require.Error(t, err)
+		require.Nil(t, addr)
+	}
+}