/
log.go
114 lines (97 loc) · 2.52 KB
/
log.go
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package logging
import (
"context"
"os"
"strings"
"sync"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type contextKey string
const logKey = contextKey("logger")
const (
levelDebug = "DEBUG"
levelInfo = "INFO"
levelWarning = "WARNING"
levelError = "ERROR"
levelCritical = "CRITICAL"
levelAlert = "ALERT"
levelEmergency = "EMERGENCY"
)
var (
// defaultLogger is the default logger. It is initialized once per package
// include upon calling DefaultLogger.
defaultLogger *zap.SugaredLogger
defaultLoggerOnce sync.Once
)
var developmentEncoderConfig = zapcore.EncoderConfig{
TimeKey: "",
LevelKey: "L",
NameKey: "N",
CallerKey: "C",
FunctionKey: zapcore.OmitKey,
MessageKey: "M",
StacktraceKey: "S",
LineEnding: zapcore.DefaultLineEnding,
EncodeLevel: zapcore.CapitalLevelEncoder,
EncodeTime: zapcore.ISO8601TimeEncoder,
EncodeDuration: zapcore.StringDurationEncoder,
EncodeCaller: zapcore.ShortCallerEncoder,
}
func FromContext(ctx context.Context) *zap.SugaredLogger {
if logger, ok := ctx.Value(logKey).(*zap.SugaredLogger); ok {
return logger
}
return DefaultLogger()
}
func WithLogger(ctx context.Context, logger *zap.SugaredLogger) context.Context {
return context.WithValue(ctx, logKey, logger)
}
func NewLogger(level string) *zap.SugaredLogger {
config := &zap.Config{
Level: zap.NewAtomicLevelAt(levelToZapLevel(level)),
Development: true,
Encoding: "console",
EncoderConfig: developmentEncoderConfig,
OutputPaths: []string{"stdout"},
ErrorOutputPaths: []string{"stdout"},
}
logger, err := config.Build()
if err != nil {
logger = zap.NewNop()
}
return logger.Sugar()
}
func IsDebug() bool {
return os.Getenv("LOG_LEVEL") == levelDebug
}
func NewLoggerFromEnv() *zap.SugaredLogger {
level := os.Getenv("LOG_LEVEL")
return NewLogger(level)
}
// DefaultLogger returns the default logger for the package.
func DefaultLogger() *zap.SugaredLogger {
defaultLoggerOnce.Do(func() {
defaultLogger = NewLoggerFromEnv()
})
return defaultLogger
}
func levelToZapLevel(s string) zapcore.Level {
switch strings.ToUpper(strings.TrimSpace(s)) {
case levelDebug:
return zapcore.DebugLevel
case levelInfo:
return zapcore.InfoLevel
case levelWarning:
return zapcore.WarnLevel
case levelError:
return zapcore.ErrorLevel
case levelCritical:
return zapcore.DPanicLevel
case levelAlert:
return zapcore.PanicLevel
case levelEmergency:
return zapcore.FatalLevel
}
return zapcore.WarnLevel
}