/
logger.go
160 lines (137 loc) · 3.65 KB
/
logger.go
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package logger
import (
"context"
"fmt"
"io"
"os"
"sync/atomic"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/ww24/linebot/internal/gcp"
)
const logLevelEnv = "LOG_LEVEL"
//nolint:gochecknoglobals
var defaultLogger atomic.Pointer[Logger]
func init() {
defaultLogger.Store(NewNop())
}
func Default(ctx context.Context) *Logger {
return defaultLogger.Load().WithTraceFromContext(ctx)
}
type Logger struct {
*zap.Logger
projectID string
}
func NewNop() *Logger { return &Logger{Logger: zap.NewNop()} }
func newLogger(w io.Writer, lvl zapcore.LevelEnabler) *Logger {
ws := zapcore.Lock(zapcore.AddSync(w))
enc := zapcore.NewJSONEncoder(newEncoderConfig())
core := newCore(zapcore.NewCore(enc, ws, lvl))
opts := []zap.Option{
zap.AddCaller(),
}
logger := zap.New(core, opts...)
projectID, err := gcp.ProjectID()
if err != nil {
logger.Warn("logger: failed to get project id", zap.Error(err))
}
return &Logger{
Logger: logger,
projectID: projectID,
}
}
func (l *Logger) clone() *Logger {
cp := *l
return &cp
}
func (l *Logger) withConfig(service, version string) *Logger {
return l.WithLogger(l.With(newServiceContext(service, version)))
}
func (l *Logger) WithLogger(zl *zap.Logger) *Logger {
cp := l.clone()
cp.Logger = zl
return cp
}
func SetConfig(service, version string) error {
return SetConfigWithWriter(service, version, os.Stderr)
}
func SetConfigWithWriter(service, version string, w io.Writer) error {
logLevel := getLogLevel(logLevelEnv)
logger := newLogger(w, logLevel).withConfig(service, version)
defaultLogger.Store(logger)
return nil
}
func (l *Logger) WithTraceFromContext(ctx context.Context) *Logger {
spanCtx := trace.SpanContextFromContext(ctx)
if !spanCtx.IsValid() || l.projectID == "" {
return l
}
fields := traceContextFields(
spanCtx.TraceID().String(),
spanCtx.SpanID().String(),
spanCtx.IsSampled(),
l.projectID,
)
return l.WithLogger(l.With(fields...))
}
func getLogLevel(env string) zapcore.Level {
logLevel := os.Getenv(env)
switch logLevel {
case "DEBUG", "debug":
return zapcore.DebugLevel
case "INFO", "info":
return zapcore.InfoLevel
case "WARN", "warn":
return zapcore.WarnLevel
case "ERROR", "error":
return zapcore.ErrorLevel
default:
return zapcore.InfoLevel
}
}
func newEncoderConfig() zapcore.EncoderConfig {
return zapcore.EncoderConfig{
TimeKey: "timestamp",
LevelKey: "severity",
NameKey: "logger",
CallerKey: "",
MessageKey: "message",
StacktraceKey: "stacktrace",
LineEnding: zapcore.DefaultLineEnding,
EncodeLevel: encodeLevel,
EncodeTime: zapcore.RFC3339NanoTimeEncoder,
EncodeDuration: zapcore.SecondsDurationEncoder,
EncodeCaller: zapcore.ShortCallerEncoder,
}
}
func encodeLevel(l zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
var severity string
switch l {
case zapcore.DebugLevel:
severity = "DEBUG"
case zapcore.InfoLevel:
severity = "INFO"
case zapcore.WarnLevel:
severity = "WARNING"
case zapcore.ErrorLevel:
severity = "ERROR"
case zapcore.DPanicLevel:
severity = "CRITICAL"
case zapcore.PanicLevel:
severity = "ALERT"
case zapcore.FatalLevel:
severity = "EMERGENCY"
default:
severity = "DEFAULT"
}
enc.AppendString(severity)
}
// see: https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry
func traceContextFields(traceID, spanID string, sampled bool, project string) []zap.Field {
return []zap.Field{
zap.String("logging.googleapis.com/trace", fmt.Sprintf("projects/%s/traces/%s", project, traceID)),
zap.String("logging.googleapis.com/spanId", spanID),
zap.Bool("logging.googleapis.com/trace_sampled", sampled),
}
}