Add a reporter to the system verification check

test/e2e_node/system/report.go

@@ -0,0 +1,78 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package system
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+// ValidationResultType is type of the validation result. Different validation results
+// corresponds to different colors.
+type ValidationResultType int32
+
+const (
+	good ValidationResultType = iota
+	bad
+	warn
+)
+
+// color is the color of the message.
+type color int32
+
+const (
+	red    color = 31
+	green        = 32
+	yellow       = 33
+	white        = 37
+)
+
+func colorize(s string, c color) string {
+	return fmt.Sprintf("\033[0;%dm%s\033[0m", c, s)
+}
+
+// The default reporter for the system verification test
+type StreamReporter struct {
+	// The stream that this reporter is writing to
+	WriteStream io.Writer
+}
+
+func (dr *StreamReporter) Report(key, value string, resultType ValidationResultType) error {
+	var c color
+	switch resultType {
+	case good:
+		c = green
+	case bad:
+		c = red
+	case warn:
+		c = yellow
+	default:
+		c = white
+	}
+	if dr.WriteStream == nil {
+		return fmt.Errorf("WriteStream has to be defined for this reporter")
+	}
+
+	fmt.Fprintf(dr.WriteStream, "%s: %s\n", colorize(key, white), colorize(value, c))
+	return nil
+}
+
+// DefaultReporter is the default Reporter
+var DefaultReporter = &StreamReporter{
+	WriteStream: os.Stdout,
+}