mirror of https://github.com/prometheus/prometheus
66 lines
2.0 KiB
Go
66 lines
2.0 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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"context"
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"fmt"
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"log/slog"
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"os"
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"github.com/prometheus/common/promslog"
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)
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// JSONFileLogger represents a logger that writes JSON to a file. It implements the promql.QueryLogger interface.
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type JSONFileLogger struct {
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logger *slog.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, fmt.Errorf("can't create json log file: %w", err)
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}
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jsonFmt := &promslog.AllowedFormat{}
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_ = jsonFmt.Set("json")
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return &JSONFileLogger{
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logger: promslog.New(&promslog.Config{Format: jsonFmt, Writer: f}),
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file: f,
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}, nil
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}
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// Close closes the underlying file. It implements the promql.QueryLogger interface.
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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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// With calls the `With()` method on the underlying `log/slog.Logger` with the
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// provided msg and args. It implements the promql.QueryLogger interface.
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func (l *JSONFileLogger) With(args ...any) {
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l.logger = l.logger.With(args...)
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}
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// Log calls the `Log()` method on the underlying `log/slog.Logger` with the
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// provided msg and args. It implements the promql.QueryLogger interface.
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func (l *JSONFileLogger) Log(ctx context.Context, level slog.Level, msg string, args ...any) {
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l.logger.Log(ctx, level, msg, args...)
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}
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