matterbridge/vendor/github.com/hashicorp/go-hclog/stdlog.go
Wim d16645c952
Update mattermost library ()
* Update mattermost library

* Fix linting
2024-05-24 23:08:09 +02:00

114 lines
2.7 KiB
Go

// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MIT
package hclog
import (
"bytes"
"log"
"regexp"
"strings"
)
// Regex to ignore characters commonly found in timestamp formats from the
// beginning of inputs.
var logTimestampRegexp = regexp.MustCompile(`^[\d\s\:\/\.\+-TZ]*`)
// Provides a io.Writer to shim the data out of *log.Logger
// and back into our Logger. This is basically the only way to
// build upon *log.Logger.
type stdlogAdapter struct {
log Logger
inferLevels bool
inferLevelsWithTimestamp bool
forceLevel Level
}
// Take the data, infer the levels if configured, and send it through
// a regular Logger.
func (s *stdlogAdapter) Write(data []byte) (int, error) {
str := string(bytes.TrimRight(data, " \t\n"))
if s.forceLevel != NoLevel {
// Use pickLevel to strip log levels included in the line since we are
// forcing the level
_, str := s.pickLevel(str)
// Log at the forced level
s.dispatch(str, s.forceLevel)
} else if s.inferLevels {
if s.inferLevelsWithTimestamp {
str = s.trimTimestamp(str)
}
level, str := s.pickLevel(str)
s.dispatch(str, level)
} else {
s.log.Info(str)
}
return len(data), nil
}
func (s *stdlogAdapter) dispatch(str string, level Level) {
switch level {
case Trace:
s.log.Trace(str)
case Debug:
s.log.Debug(str)
case Info:
s.log.Info(str)
case Warn:
s.log.Warn(str)
case Error:
s.log.Error(str)
default:
s.log.Info(str)
}
}
// Detect, based on conventions, what log level this is.
func (s *stdlogAdapter) pickLevel(str string) (Level, string) {
switch {
case strings.HasPrefix(str, "[DEBUG]"):
return Debug, strings.TrimSpace(str[7:])
case strings.HasPrefix(str, "[TRACE]"):
return Trace, strings.TrimSpace(str[7:])
case strings.HasPrefix(str, "[INFO]"):
return Info, strings.TrimSpace(str[6:])
case strings.HasPrefix(str, "[WARN]"):
return Warn, strings.TrimSpace(str[6:])
case strings.HasPrefix(str, "[ERROR]"):
return Error, strings.TrimSpace(str[7:])
case strings.HasPrefix(str, "[ERR]"):
return Error, strings.TrimSpace(str[5:])
default:
return Info, str
}
}
func (s *stdlogAdapter) trimTimestamp(str string) string {
idx := logTimestampRegexp.FindStringIndex(str)
return str[idx[1]:]
}
type logWriter struct {
l *log.Logger
}
func (l *logWriter) Write(b []byte) (int, error) {
l.l.Println(string(bytes.TrimRight(b, " \n\t")))
return len(b), nil
}
// Takes a standard library logger and returns a Logger that will write to it
func FromStandardLogger(l *log.Logger, opts *LoggerOptions) Logger {
var dl LoggerOptions = *opts
// Use the time format that log.Logger uses
dl.DisableTime = true
dl.Output = &logWriter{l}
return New(&dl)
}