prometheus/util/logging/file_test.go

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// Copyright 2020 The Prometheus 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 logging
import (
"io/ioutil"
"os"
"regexp"
"strings"
"testing"
"github.com/stretchr/testify/require"
)
func TestJSONFileLogger_basic(t *testing.T) {
f, err := ioutil.TempFile("", "logging")
require.NoError(t, err)
defer func() {
require.NoError(t, f.Close())
require.NoError(t, os.Remove(f.Name()))
}()
l, err := NewJSONFileLogger(f.Name())
require.NoError(t, err)
require.NotNil(t, l, "logger can't be nil")
err = l.Log("test", "yes")
require.NoError(t, err)
r := make([]byte, 1024)
_, err = f.Read(r)
require.NoError(t, err)
result, err := regexp.Match(`^{"test":"yes","ts":"[^"]+"}\n`, r)
require.NoError(t, err)
require.True(t, result, "unexpected content: %s", r)
err = l.Close()
require.NoError(t, err)
err = l.file.Close()
require.Error(t, err)
require.True(t, strings.HasSuffix(err.Error(), os.ErrClosed.Error()), "file not closed")
}
func TestJSONFileLogger_parallel(t *testing.T) {
f, err := ioutil.TempFile("", "logging")
require.NoError(t, err)
defer func() {
require.NoError(t, f.Close())
require.NoError(t, os.Remove(f.Name()))
}()
l, err := NewJSONFileLogger(f.Name())
require.NoError(t, err)
require.NotNil(t, l, "logger can't be nil")
err = l.Log("test", "yes")
require.NoError(t, err)
l2, err := NewJSONFileLogger(f.Name())
require.NoError(t, err)
require.NotNil(t, l, "logger can't be nil")
err = l2.Log("test", "yes")
require.NoError(t, err)
err = l.Close()
require.NoError(t, err)
err = l.file.Close()
require.Error(t, err)
require.True(t, strings.HasSuffix(err.Error(), os.ErrClosed.Error()), "file not closed")
err = l2.Close()
require.NoError(t, err)
err = l2.file.Close()
require.Error(t, err)
require.True(t, strings.HasSuffix(err.Error(), os.ErrClosed.Error()), "file not closed")
}