restart plugin: support binary log uri

Introduce LogURIGenerator helper function in cio package. It is used in
the restart options, like WithBinaryLogURI and WithFileLogURI.

And restart.LogPathLabel might be used in production and work well. In
order to reduce breaking change, the LogPathLabel is still recognized if
new LogURILabel is not set. In next release 1.5, the LogPathLabel will
be removed.

Signed-off-by: Wei Fu <fuweid89@gmail.com>

cio/io_test.go

@@ -195,3 +195,47 @@ func TestLogFileFailOnRelativePath(t *testing.T) {
 	_, err := LogFile("./file.txt")("!")
 	assert.Error(t, err, "absolute path needed")
 }
+
+func TestLogURIGenerator(t *testing.T) {
+	for _, tc := range []struct {
+		scheme   string
+		path     string
+		args     map[string]string
+		expected string
+		err      string
+	}{
+		{
+			scheme:   "fifo",
+			path:     "/full/path/pipe.fifo",
+			expected: "fifo:///full/path/pipe.fifo",
+		},
+		{
+			scheme: "file",
+			path:   "/full/path/file.txt",
+			args: map[string]string{
+				"maxSize": "100MB",
+			},
+			expected: "file:///full/path/file.txt?maxSize=100MB",
+		},
+		{
+			scheme: "binary",
+			path:   "/full/path/bin",
+			args: map[string]string{
+				"id": "testing",
+			},
+			expected: "binary:///full/path/bin?id=testing",
+		},
+		{
+			scheme: "unknown",
+			path:   "nowhere",
+			err:    "absolute path needed",
+		},
+	} {
+		uri, err := LogURIGenerator(tc.scheme, tc.path, tc.args)
+		if err != nil {
+			assert.Error(t, err, tc.err)
+			continue
+		}
+		assert.Equal(t, tc.expected, uri.String())
+	}
+}