mirror of
https://github.com/prometheus/prometheus.git
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63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package logging
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import (
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"os"
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"time"
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"github.com/go-kit/log"
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"github.com/pkg/errors"
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)
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var (
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timestampFormat = log.TimestampFormat(
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func() time.Time { return time.Now().UTC() },
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"2006-01-02T15:04:05.000Z07:00",
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)
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)
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// JSONFileLogger represents a logger that writes JSON to a file.
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type JSONFileLogger struct {
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logger log.Logger
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file *os.File
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}
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// NewJSONFileLogger returns a new JSONFileLogger.
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func NewJSONFileLogger(s string) (*JSONFileLogger, error) {
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if s == "" {
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return nil, nil
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}
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f, err := os.OpenFile(s, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
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if err != nil {
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return nil, errors.Wrap(err, "can't create json logger")
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}
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return &JSONFileLogger{
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logger: log.With(log.NewJSONLogger(f), "ts", timestampFormat),
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file: f,
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}, nil
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}
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// Close closes the underlying file.
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func (l *JSONFileLogger) Close() error {
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return l.file.Close()
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}
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// Log calls the Log function of the underlying logger.
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func (l *JSONFileLogger) Log(i ...interface{}) error {
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return l.logger.Log(i...)
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}
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