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60 lines
1.6 KiB
60 lines
1.6 KiB
// 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 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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// 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, 0o666) |
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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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