package zerolog import ( "context" "fmt" "net" "os" "runtime" "sync" "time" ) var eventPool = &sync.Pool{ New: func() interface{} { return &Event{ buf: make([]byte, 0, 500), } }, } // Event represents a log event. It is instanced by one of the level method of // Logger and finalized by the Msg or Msgf method. type Event struct { buf []byte w LevelWriter level Level done func(msg string) stack bool // enable error stack trace ch []Hook // hooks from context skipFrame int // The number of additional frames to skip when printing the caller. ctx context.Context // Optional Go context for event } func putEvent(e *Event) { // Proper usage of a sync.Pool requires each entry to have approximately // the same memory cost. To obtain this property when the stored type // contains a variably-sized buffer, we add a hard limit on the maximum buffer // to place back in the pool. // // See https://golang.org/issue/23199 const maxSize = 1 << 16 // 64KiB if cap(e.buf) > maxSize { return } eventPool.Put(e) } // LogObjectMarshaler provides a strongly-typed and encoding-agnostic interface // to be implemented by types used with Event/Context's Object methods. type LogObjectMarshaler interface { MarshalZerologObject(e *Event) } // LogArrayMarshaler provides a strongly-typed and encoding-agnostic interface // to be implemented by types used with Event/Context's Array methods. type LogArrayMarshaler interface { MarshalZerologArray(a *Array) } func newEvent(w LevelWriter, level Level) *Event { e := eventPool.Get().(*Event) e.buf = e.buf[:0] e.ch = nil e.buf = enc.AppendBeginMarker(e.buf) e.w = w e.level = level e.stack = false e.skipFrame = 0 return e } func (e *Event) write() (err error) { if e == nil { return nil } if e.level != Disabled { e.buf = enc.AppendEndMarker(e.buf) e.buf = enc.AppendLineBreak(e.buf) if e.w != nil { _, err = e.w.WriteLevel(e.level, e.buf) } } putEvent(e) return } // Enabled return false if the *Event is going to be filtered out by // log level or sampling. func (e *Event) Enabled() bool { return e != nil && e.level != Disabled } // Discard disables the event so Msg(f) won't print it. func (e *Event) Discard() *Event { if e == nil { return e } e.level = Disabled return nil } // Msg sends the *Event with msg added as the message field if not empty. // // NOTICE: once this method is called, the *Event should be disposed. // Calling Msg twice can have unexpected result. func (e *Event) Msg(msg string) { if e == nil { return } e.msg(msg) } // Send is equivalent to calling Msg(""). // // NOTICE: once this method is called, the *Event should be disposed. func (e *Event) Send() { if e == nil { return } e.msg("") } // Msgf sends the event with formatted msg added as the message field if not empty. // // NOTICE: once this method is called, the *Event should be disposed. // Calling Msgf twice can have unexpected result. func (e *Event) Msgf(format string, v ...interface{}) { if e == nil { return } e.msg(fmt.Sprintf(format, v...)) } func (e *Event) MsgFunc(createMsg func() string) { if e == nil { return } e.msg(createMsg()) } func (e *Event) msg(msg string) { for _, hook := range e.ch { hook.Run(e, e.level, msg) } if msg != "" { e.buf = enc.AppendString(enc.AppendKey(e.buf, MessageFieldName), msg) } if e.done != nil { defer e.done(msg) } if err := e.write(); err != nil { if ErrorHandler != nil { ErrorHandler(err) } else { fmt.Fprintf(os.Stderr, "zerolog: could not write event: %v\n", err) } } } // Fields is a helper function to use a map or slice to set fields using type assertion. // Only map[string]interface{} and []interface{} are accepted. []interface{} must // alternate string keys and arbitrary values, and extraneous ones are ignored. func (e *Event) Fields(fields interface{}) *Event { if e == nil { return e } e.buf = appendFields(e.buf, fields, e.stack) return e } // Dict adds the field key with a dict to the event context. // Use zerolog.Dict() to create the dictionary. func (e *Event) Dict(key string, dict *Event) *Event { if e == nil { return e } dict.buf = enc.AppendEndMarker(dict.buf) e.buf = append(enc.AppendKey(e.buf, key), dict.buf...) putEvent(dict) return e } // Dict creates an Event to be used with the *Event.Dict method. // Call usual field methods like Str, Int etc to add fields to this // event and give it as argument the *Event.Dict method. func Dict() *Event { return newEvent(nil, 0) } // Array adds the field key with an array to the event context. // Use zerolog.Arr() to create the array or pass a type that // implement the LogArrayMarshaler interface. func (e *Event) Array(key string, arr LogArrayMarshaler) *Event { if e == nil { return e } e.buf = enc.AppendKey(e.buf, key) var a *Array if aa, ok := arr.(*Array); ok { a = aa } else { a = Arr() arr.MarshalZerologArray(a) } e.buf = a.write(e.buf) return e } func (e *Event) appendObject(obj LogObjectMarshaler) { e.buf = enc.AppendBeginMarker(e.buf) obj.MarshalZerologObject(e) e.buf = enc.AppendEndMarker(e.buf) } // Object marshals an object that implement the LogObjectMarshaler interface. func (e *Event) Object(key string, obj LogObjectMarshaler) *Event { if e == nil { return e } e.buf = enc.AppendKey(e.buf, key) if obj == nil { e.buf = enc.AppendNil(e.buf) return e } e.appendObject(obj) return e } // Func allows an anonymous func to run only if the event is enabled. func (e *Event) Func(f func(e *Event)) *Event { if e != nil && e.Enabled() { f(e) } return e } // EmbedObject marshals an object that implement the LogObjectMarshaler interface. func (e *Event) EmbedObject(obj LogObjectMarshaler) *Event { if e == nil { return e } if obj == nil { return e } obj.MarshalZerologObject(e) return e } // Str adds the field key with val as a string to the *Event context. func (e *Event) Str(key, val string) *Event { if e == nil { return e } e.buf = enc.AppendString(enc.AppendKey(e.buf, key), val) return e } // Strs adds the field key with vals as a []string to the *Event context. func (e *Event) Strs(key string, vals []string) *Event { if e == nil { return e } e.buf = enc.AppendStrings(enc.AppendKey(e.buf, key), vals) return e } // Stringer adds the field key with val.String() (or null if val is nil) // to the *Event context. func (e *Event) Stringer(key string, val fmt.Stringer) *Event { if e == nil { return e } e.buf = enc.AppendStringer(enc.AppendKey(e.buf, key), val) return e } // Stringers adds the field key with vals where each individual val // is used as val.String() (or null if val is empty) to the *Event // context. func (e *Event) Stringers(key string, vals []fmt.Stringer) *Event { if e == nil { return e } e.buf = enc.AppendStringers(enc.AppendKey(e.buf, key), vals) return e } // Bytes adds the field key with val as a string to the *Event context. // // Runes outside of normal ASCII ranges will be hex-encoded in the resulting // JSON. func (e *Event) Bytes(key string, val []byte) *Event { if e == nil { return e } e.buf = enc.AppendBytes(enc.AppendKey(e.buf, key), val) return e } // Hex adds the field key with val as a hex string to the *Event context. func (e *Event) Hex(key string, val []byte) *Event { if e == nil { return e } e.buf = enc.AppendHex(enc.AppendKey(e.buf, key), val) return e } // RawJSON adds already encoded JSON to the log line under key. // // No sanity check is performed on b; it must not contain carriage returns and // be valid JSON. func (e *Event) RawJSON(key string, b []byte) *Event { if e == nil { return e } e.buf = appendJSON(enc.AppendKey(e.buf, key), b) return e } // RawCBOR adds already encoded CBOR to the log line under key. // // No sanity check is performed on b // Note: The full featureset of CBOR is supported as data will not be mapped to json but stored as data-url func (e *Event) RawCBOR(key string, b []byte) *Event { if e == nil { return e } e.buf = appendCBOR(enc.AppendKey(e.buf, key), b) return e } // AnErr adds the field key with serialized err to the *Event context. // If err is nil, no field is added. func (e *Event) AnErr(key string, err error) *Event { if e == nil { return e } switch m := ErrorMarshalFunc(err).(type) { case nil: return e case LogObjectMarshaler: return e.Object(key, m) case error: if m == nil || isNilValue(m) { return e } else { return e.Str(key, m.Error()) } case string: return e.Str(key, m) default: return e.Interface(key, m) } } // Errs adds the field key with errs as an array of serialized errors to the // *Event context. func (e *Event) Errs(key string, errs []error) *Event { if e == nil { return e } arr := Arr() for _, err := range errs { switch m := ErrorMarshalFunc(err).(type) { case LogObjectMarshaler: arr = arr.Object(m) case error: arr = arr.Err(m) case string: arr = arr.Str(m) default: arr = arr.Interface(m) } } return e.Array(key, arr) } // Err adds the field "error" with serialized err to the *Event context. // If err is nil, no field is added. // // To customize the key name, change zerolog.ErrorFieldName. // // If Stack() has been called before and zerolog.ErrorStackMarshaler is defined, // the err is passed to ErrorStackMarshaler and the result is appended to the // zerolog.ErrorStackFieldName. func (e *Event) Err(err error) *Event { if e == nil { return e } if e.stack && ErrorStackMarshaler != nil { switch m := ErrorStackMarshaler(err).(type) { case nil: case LogObjectMarshaler: e.Object(ErrorStackFieldName, m) case error: if m != nil && !isNilValue(m) { e.Str(ErrorStackFieldName, m.Error()) } case string: e.Str(ErrorStackFieldName, m) default: e.Interface(ErrorStackFieldName, m) } } return e.AnErr(ErrorFieldName, err) } // Stack enables stack trace printing for the error passed to Err(). // // ErrorStackMarshaler must be set for this method to do something. func (e *Event) Stack() *Event { if e != nil { e.stack = true } return e } // Ctx adds the Go Context to the *Event context. The context is not rendered // in the output message, but is available to hooks and to Func() calls via the // GetCtx() accessor. A typical use case is to extract tracing information from // the Go Ctx. func (e *Event) Ctx(ctx context.Context) *Event { if e != nil { e.ctx = ctx } return e } // GetCtx retrieves the Go context.Context which is optionally stored in the // Event. This allows Hooks and functions passed to Func() to retrieve values // which are stored in the context.Context. This can be useful in tracing, // where span information is commonly propagated in the context.Context. func (e *Event) GetCtx() context.Context { if e == nil || e.ctx == nil { return context.Background() } return e.ctx } // Bool adds the field key with val as a bool to the *Event context. func (e *Event) Bool(key string, b bool) *Event { if e == nil { return e } e.buf = enc.AppendBool(enc.AppendKey(e.buf, key), b) return e } // Bools adds the field key with val as a []bool to the *Event context. func (e *Event) Bools(key string, b []bool) *Event { if e == nil { return e } e.buf = enc.AppendBools(enc.AppendKey(e.buf, key), b) return e } // Int adds the field key with i as a int to the *Event context. func (e *Event) Int(key string, i int) *Event { if e == nil { return e } e.buf = enc.AppendInt(enc.AppendKey(e.buf, key), i) return e } // Ints adds the field key with i as a []int to the *Event context. func (e *Event) Ints(key string, i []int) *Event { if e == nil { return e } e.buf = enc.AppendInts(enc.AppendKey(e.buf, key), i) return e } // Int8 adds the field key with i as a int8 to the *Event context. func (e *Event) Int8(key string, i int8) *Event { if e == nil { return e } e.buf = enc.AppendInt8(enc.AppendKey(e.buf, key), i) return e } // Ints8 adds the field key with i as a []int8 to the *Event context. func (e *Event) Ints8(key string, i []int8) *Event { if e == nil { return e } e.buf = enc.AppendInts8(enc.AppendKey(e.buf, key), i) return e } // Int16 adds the field key with i as a int16 to the *Event context. func (e *Event) Int16(key string, i int16) *Event { if e == nil { return e } e.buf = enc.AppendInt16(enc.AppendKey(e.buf, key), i) return e } // Ints16 adds the field key with i as a []int16 to the *Event context. func (e *Event) Ints16(key string, i []int16) *Event { if e == nil { return e } e.buf = enc.AppendInts16(enc.AppendKey(e.buf, key), i) return e } // Int32 adds the field key with i as a int32 to the *Event context. func (e *Event) Int32(key string, i int32) *Event { if e == nil { return e } e.buf = enc.AppendInt32(enc.AppendKey(e.buf, key), i) return e } // Ints32 adds the field key with i as a []int32 to the *Event context. func (e *Event) Ints32(key string, i []int32) *Event { if e == nil { return e } e.buf = enc.AppendInts32(enc.AppendKey(e.buf, key), i) return e } // Int64 adds the field key with i as a int64 to the *Event context. func (e *Event) Int64(key string, i int64) *Event { if e == nil { return e } e.buf = enc.AppendInt64(enc.AppendKey(e.buf, key), i) return e } // Ints64 adds the field key with i as a []int64 to the *Event context. func (e *Event) Ints64(key string, i []int64) *Event { if e == nil { return e } e.buf = enc.AppendInts64(enc.AppendKey(e.buf, key), i) return e } // Uint adds the field key with i as a uint to the *Event context. func (e *Event) Uint(key string, i uint) *Event { if e == nil { return e } e.buf = enc.AppendUint(enc.AppendKey(e.buf, key), i) return e } // Uints adds the field key with i as a []int to the *Event context. func (e *Event) Uints(key string, i []uint) *Event { if e == nil { return e } e.buf = enc.AppendUints(enc.AppendKey(e.buf, key), i) return e } // Uint8 adds the field key with i as a uint8 to the *Event context. func (e *Event) Uint8(key string, i uint8) *Event { if e == nil { return e } e.buf = enc.AppendUint8(enc.AppendKey(e.buf, key), i) return e } // Uints8 adds the field key with i as a []int8 to the *Event context. func (e *Event) Uints8(key string, i []uint8) *Event { if e == nil { return e } e.buf = enc.AppendUints8(enc.AppendKey(e.buf, key), i) return e } // Uint16 adds the field key with i as a uint16 to the *Event context. func (e *Event) Uint16(key string, i uint16) *Event { if e == nil { return e } e.buf = enc.AppendUint16(enc.AppendKey(e.buf, key), i) return e } // Uints16 adds the field key with i as a []int16 to the *Event context. func (e *Event) Uints16(key string, i []uint16) *Event { if e == nil { return e } e.buf = enc.AppendUints16(enc.AppendKey(e.buf, key), i) return e } // Uint32 adds the field key with i as a uint32 to the *Event context. func (e *Event) Uint32(key string, i uint32) *Event { if e == nil { return e } e.buf = enc.AppendUint32(enc.AppendKey(e.buf, key), i) return e } // Uints32 adds the field key with i as a []int32 to the *Event context. func (e *Event) Uints32(key string, i []uint32) *Event { if e == nil { return e } e.buf = enc.AppendUints32(enc.AppendKey(e.buf, key), i) return e } // Uint64 adds the field key with i as a uint64 to the *Event context. func (e *Event) Uint64(key string, i uint64) *Event { if e == nil { return e } e.buf = enc.AppendUint64(enc.AppendKey(e.buf, key), i) return e } // Uints64 adds the field key with i as a []int64 to the *Event context. func (e *Event) Uints64(key string, i []uint64) *Event { if e == nil { return e } e.buf = enc.AppendUints64(enc.AppendKey(e.buf, key), i) return e } // Float32 adds the field key with f as a float32 to the *Event context. func (e *Event) Float32(key string, f float32) *Event { if e == nil { return e } e.buf = enc.AppendFloat32(enc.AppendKey(e.buf, key), f) return e } // Floats32 adds the field key with f as a []float32 to the *Event context. func (e *Event) Floats32(key string, f []float32) *Event { if e == nil { return e } e.buf = enc.AppendFloats32(enc.AppendKey(e.buf, key), f) return e } // Float64 adds the field key with f as a float64 to the *Event context. func (e *Event) Float64(key string, f float64) *Event { if e == nil { return e } e.buf = enc.AppendFloat64(enc.AppendKey(e.buf, key), f) return e } // Floats64 adds the field key with f as a []float64 to the *Event context. func (e *Event) Floats64(key string, f []float64) *Event { if e == nil { return e } e.buf = enc.AppendFloats64(enc.AppendKey(e.buf, key), f) return e } // Timestamp adds the current local time as UNIX timestamp to the *Event context with the "time" key. // To customize the key name, change zerolog.TimestampFieldName. // // NOTE: It won't dedupe the "time" key if the *Event (or *Context) has one // already. func (e *Event) Timestamp() *Event { if e == nil { return e } e.buf = enc.AppendTime(enc.AppendKey(e.buf, TimestampFieldName), TimestampFunc(), TimeFieldFormat) return e } // Time adds the field key with t formatted as string using zerolog.TimeFieldFormat. func (e *Event) Time(key string, t time.Time) *Event { if e == nil { return e } e.buf = enc.AppendTime(enc.AppendKey(e.buf, key), t, TimeFieldFormat) return e } // Times adds the field key with t formatted as string using zerolog.TimeFieldFormat. func (e *Event) Times(key string, t []time.Time) *Event { if e == nil { return e } e.buf = enc.AppendTimes(enc.AppendKey(e.buf, key), t, TimeFieldFormat) return e } // Dur adds the field key with duration d stored as zerolog.DurationFieldUnit. // If zerolog.DurationFieldInteger is true, durations are rendered as integer // instead of float. func (e *Event) Dur(key string, d time.Duration) *Event { if e == nil { return e } e.buf = enc.AppendDuration(enc.AppendKey(e.buf, key), d, DurationFieldUnit, DurationFieldInteger) return e } // Durs adds the field key with duration d stored as zerolog.DurationFieldUnit. // If zerolog.DurationFieldInteger is true, durations are rendered as integer // instead of float. func (e *Event) Durs(key string, d []time.Duration) *Event { if e == nil { return e } e.buf = enc.AppendDurations(enc.AppendKey(e.buf, key), d, DurationFieldUnit, DurationFieldInteger) return e } // TimeDiff adds the field key with positive duration between time t and start. // If time t is not greater than start, duration will be 0. // Duration format follows the same principle as Dur(). func (e *Event) TimeDiff(key string, t time.Time, start time.Time) *Event { if e == nil { return e } var d time.Duration if t.After(start) { d = t.Sub(start) } e.buf = enc.AppendDuration(enc.AppendKey(e.buf, key), d, DurationFieldUnit, DurationFieldInteger) return e } // Any is a wrapper around Event.Interface. func (e *Event) Any(key string, i interface{}) *Event { return e.Interface(key, i) } // Interface adds the field key with i marshaled using reflection. func (e *Event) Interface(key string, i interface{}) *Event { if e == nil { return e } if obj, ok := i.(LogObjectMarshaler); ok { return e.Object(key, obj) } e.buf = enc.AppendInterface(enc.AppendKey(e.buf, key), i) return e } // Type adds the field key with val's type using reflection. func (e *Event) Type(key string, val interface{}) *Event { if e == nil { return e } e.buf = enc.AppendType(enc.AppendKey(e.buf, key), val) return e } // CallerSkipFrame instructs any future Caller calls to skip the specified number of frames. // This includes those added via hooks from the context. func (e *Event) CallerSkipFrame(skip int) *Event { if e == nil { return e } e.skipFrame += skip return e } // Caller adds the file:line of the caller with the zerolog.CallerFieldName key. // The argument skip is the number of stack frames to ascend // Skip If not passed, use the global variable CallerSkipFrameCount func (e *Event) Caller(skip ...int) *Event { sk := CallerSkipFrameCount if len(skip) > 0 { sk = skip[0] + CallerSkipFrameCount } return e.caller(sk) } func (e *Event) caller(skip int) *Event { if e == nil { return e } pc, file, line, ok := runtime.Caller(skip + e.skipFrame) if !ok { return e } e.buf = enc.AppendString(enc.AppendKey(e.buf, CallerFieldName), CallerMarshalFunc(pc, file, line)) return e } // IPAddr adds IPv4 or IPv6 Address to the event func (e *Event) IPAddr(key string, ip net.IP) *Event { if e == nil { return e } e.buf = enc.AppendIPAddr(enc.AppendKey(e.buf, key), ip) return e } // IPPrefix adds IPv4 or IPv6 Prefix (address and mask) to the event func (e *Event) IPPrefix(key string, pfx net.IPNet) *Event { if e == nil { return e } e.buf = enc.AppendIPPrefix(enc.AppendKey(e.buf, key), pfx) return e } // MACAddr adds MAC address to the event func (e *Event) MACAddr(key string, ha net.HardwareAddr) *Event { if e == nil { return e } e.buf = enc.AppendMACAddr(enc.AppendKey(e.buf, key), ha) return e }