grpclog/loggerv2_test.go

/*
 *
 * Copyright 2017, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 *
 */

package grpclog

import (
	"bytes"
	"fmt"
	"regexp"
	"testing"
)

func TestLoggerV2Severity(t *testing.T) {
	buffers := []*bytes.Buffer{new(bytes.Buffer), new(bytes.Buffer), new(bytes.Buffer)}
	SetLoggerV2(NewLoggerV2(buffers[infoLog], buffers[warningLog], buffers[errorLog]))

	Info(severityName[infoLog])
	Warning(severityName[warningLog])
	Error(severityName[errorLog])

	for i := 0; i < fatalLog; i++ {
		buf := buffers[i]
		// The content of info buffer should be something like:
		//  INFO: 2017/04/07 14:55:42 INFO
		//  WARNING: 2017/04/07 14:55:42 WARNING
		//  ERROR: 2017/04/07 14:55:42 ERROR
		for j := i; j < fatalLog; j++ {
			b, err := buf.ReadBytes('\n')
			if err != nil {
				t.Fatal(err)
			}
			if err := checkLogForSeverity(j, b); err != nil {
				t.Fatal(err)
			}
		}
	}
}

// check if b is in the format of:
//  WARNING: 2017/04/07 14:55:42 WARNING
func checkLogForSeverity(s int, b []byte) error {
	expected := regexp.MustCompile(fmt.Sprintf(`^%s: [0-9]{4}/[0-9]{2}/[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} %s\n$`, severityName[s], severityName[s]))
	if m := expected.Match(b); !m {
		return fmt.Errorf("got: %v, want string in format of: %v", string(b), severityName[s]+": 2016/10/05 17:09:26 "+severityName[s])
	}
	return nil
}