Created
February 11, 2023 02:10
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reconfigurable slog logger
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package utils | |
import ( | |
"io" | |
"os" | |
"sync" | |
"github.com/m-mizutani/goerr" | |
"golang.org/x/exp/slog" | |
) | |
var logger = slog.Default() | |
var loggerMutex sync.Mutex | |
func Logger() *slog.Logger { | |
return logger | |
} | |
func ReconfigureLogger(format, level, output string) error { | |
logLevelMap := map[string]slog.Level{ | |
"debug": slog.LevelDebug, | |
"info": slog.LevelInfo, | |
"warn": slog.LevelWarn, | |
"error": slog.LevelError, | |
} | |
logLevel, ok := logLevelMap[level] | |
if !ok { | |
return goerr.New("invalid log format, should be 'debug', 'info', 'warn' or 'error'").With("actual", level) | |
} | |
var w io.Writer | |
switch output { | |
case "-", "stdout": | |
w = os.Stdout | |
case "stderr": | |
w = os.Stderr | |
default: | |
fd, err := os.Create(output) | |
if err != nil { | |
return goerr.Wrap(err, "opening log file") | |
} | |
w = fd | |
} | |
opt := slog.HandlerOptions{ | |
AddSource: logLevel <= slog.LevelDebug, | |
Level: logLevel, | |
} | |
var newLogger *slog.Logger | |
switch format { | |
case "text": | |
newLogger = slog.New(opt.NewTextHandler(w)) | |
case "json": | |
newLogger = slog.New(opt.NewJSONHandler(w)) | |
default: | |
return goerr.New("invalid log format, should be 'text' or 'json'").With("actual", format) | |
} | |
loggerMutex.Lock() | |
logger = newLogger | |
loggerMutex.Unlock() | |
return nil | |
} |
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