95 lines
2.9 KiB
Go
95 lines
2.9 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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"io"
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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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var _ slog.Handler = (*JSONFileLogger)(nil)
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var _ io.Closer = (*JSONFileLogger)(nil)
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// JSONFileLogger represents a logger that writes JSON to a file.
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// It implements the promql.QueryLogger interface.
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type JSONFileLogger struct {
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handler slog.Handler
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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.NewFormat()
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_ = jsonFmt.Set("json")
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return &JSONFileLogger{
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handler: promslog.New(&promslog.Config{Format: jsonFmt, Writer: f}).Handler(),
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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 io.Closer 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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// Enabled returns true if and only if the internal slog.Handler is enabled. It
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// implements the slog.Handler interface.
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func (l *JSONFileLogger) Enabled(ctx context.Context, level slog.Level) bool {
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return l.handler.Enabled(ctx, level)
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}
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// Handle takes record created by an slog.Logger and forwards it to the
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// internal slog.Handler for dispatching the log call to the backing file. It
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// implements the slog.Handler interface.
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func (l *JSONFileLogger) Handle(ctx context.Context, r slog.Record) error {
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return l.handler.Handle(ctx, r.Clone())
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}
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// WithAttrs returns a new *JSONFileLogger with a new internal handler that has
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// the provided attrs attached as attributes on all further log calls. It
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// implements the slog.Handler interface.
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func (l *JSONFileLogger) WithAttrs(attrs []slog.Attr) slog.Handler {
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if len(attrs) == 0 {
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return l
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}
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return &JSONFileLogger{file: l.file, handler: l.handler.WithAttrs(attrs)}
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}
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// WithGroup returns a new *JSONFileLogger with a new internal handler that has
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// the provided group name attached, to group all other attributes added to the
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// logger. It implements the slog.Handler interface.
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func (l *JSONFileLogger) WithGroup(name string) slog.Handler {
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if name == "" {
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return l
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}
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return &JSONFileLogger{file: l.file, handler: l.handler.WithGroup(name)}
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}
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