1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// Copyright 2017 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 promlog defines standardised ways to initialize Go kit loggers
// across Prometheus components.
// It should typically only ever be imported by main packages.
package promlog
import (
"os"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
)
// AllowedLevel is a settable identifier for the minimum level a log entry
// must be have.
type AllowedLevel struct {
s string
o level.Option
}
func (l *AllowedLevel) String() string {
return l.s
}
// Set updates the value of the allowed level.
func (l *AllowedLevel) Set(s string) error {
switch s {
case "debug":
l.o = level.AllowDebug()
case "info":
l.o = level.AllowInfo()
case "warn":
l.o = level.AllowWarn()
case "error":
l.o = level.AllowError()
default:
return errors.Errorf("unrecognized log level %q", s)
}
l.s = s
return nil
}
// AllowedFormat is a settable identifier for the output format that the logger can have.
type AllowedFormat struct {
s string
}
func (f *AllowedFormat) String() string {
return f.s
}
// Set updates the value of the allowed format.
func (f *AllowedFormat) Set(s string) error {
switch s {
case "logfmt", "json":
f.s = s
default:
return errors.Errorf("unrecognized log format %q", s)
}
return nil
}
// Config is a struct containing configurable settings for the logger
type Config struct {
Level *AllowedLevel
Format *AllowedFormat
}
// New returns a new leveled oklog logger. Each logged line will be annotated
// with a timestamp. The output always goes to stderr.
func New(config *Config) log.Logger {
var l log.Logger
if config.Format.s == "logfmt" {
l = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
} else {
l = log.NewJSONLogger(log.NewSyncWriter(os.Stderr))
}
l = level.NewFilter(l, config.Level.o)
l = log.With(l, "ts", log.DefaultTimestampUTC, "caller", log.DefaultCaller)
return l
}
|
