zapcore

package
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 Go to latest Published: Mar 28, 2024 License: MIT Imports: 21 Imported by: 0

Documentation

Overview

Package zapcore defines and implements the low-level interfaces upon which zap is built. By providing alternate implementations of these interfaces, external packages can extend zap's capabilities.

Index

Constants

View Source 
const DefaultLineEnding = "\n"

DefaultLineEnding defines the default line ending when writing logs. Alternate line endings specified in EncoderConfig can override this behavior.

View Source 
const OmitKey = ""

OmitKey defines the key to use when callers want to remove a key from log output.

Variables

View Source 
var DefaultClock = systemClock{}

DefaultClock is the default clock used by Zap in operations that require time. This clock uses the system clock for all operations.

Functions

func CapitalColorLevelEncoder 

func CapitalColorLevelEncoder(l Level, enc PrimitiveArrayEncoder)

CapitalColorLevelEncoder serializes a Level to an all-caps string and adds color. For example, InfoLevel is serialized to "INFO" and colored blue.

func CapitalLevelEncoder 

func CapitalLevelEncoder(l Level, enc PrimitiveArrayEncoder)

CapitalLevelEncoder serializes a Level to an all-caps string. For example, InfoLevel is serialized to "INFO".

func EpochMillisTimeEncoder 

func EpochMillisTimeEncoder(t time.Time, enc PrimitiveArrayEncoder)

EpochMillisTimeEncoder serializes a time.Time to a floating-point number of milliseconds since the Unix epoch.

func EpochNanosTimeEncoder 

func EpochNanosTimeEncoder(t time.Time, enc PrimitiveArrayEncoder)

EpochNanosTimeEncoder serializes a time.Time to an integer number of nanoseconds since the Unix epoch.

func EpochTimeEncoder 

func EpochTimeEncoder(t time.Time, enc PrimitiveArrayEncoder)

EpochTimeEncoder serializes a time.Time to a floating-point number of seconds since the Unix epoch.

func FullCallerEncoder 

func FullCallerEncoder(caller EntryCaller, enc PrimitiveArrayEncoder)

FullCallerEncoder serializes a caller in /full/path/to/package/file:line format.

func FullNameEncoder 

func FullNameEncoder(loggerName string, enc PrimitiveArrayEncoder)

FullNameEncoder serializes the logger name as-is.

func ISO8601TimeEncoder 

func ISO8601TimeEncoder(t time.Time, enc PrimitiveArrayEncoder)

ISO8601TimeEncoder serializes a time.Time to an ISO8601-formatted string with millisecond precision.

If enc supports AppendTimeLayout(t time.Time,layout string), it's used instead of appending a pre-formatted string value.

func LowercaseColorLevelEncoder 

func LowercaseColorLevelEncoder(l Level, enc PrimitiveArrayEncoder)

LowercaseColorLevelEncoder serializes a Level to a lowercase string and adds coloring. For example, InfoLevel is serialized to "info" and colored blue.

func LowercaseLevelEncoder 

func LowercaseLevelEncoder(l Level, enc PrimitiveArrayEncoder)

LowercaseLevelEncoder serializes a Level to a lowercase string. For example, InfoLevel is serialized to "info".

func MillisDurationEncoder 

func MillisDurationEncoder(d time.Duration, enc PrimitiveArrayEncoder)

MillisDurationEncoder serializes a time.Duration to an integer number of milliseconds elapsed.

func NanosDurationEncoder 

func NanosDurationEncoder(d time.Duration, enc PrimitiveArrayEncoder)

NanosDurationEncoder serializes a time.Duration to an integer number of nanoseconds elapsed.

func RFC3339NanoTimeEncoder 

func RFC3339NanoTimeEncoder(t time.Time, enc PrimitiveArrayEncoder)

RFC3339NanoTimeEncoder serializes a time.Time to an RFC3339-formatted string with nanosecond precision.

If enc supports AppendTimeLayout(t time.Time,layout string), it's used instead of appending a pre-formatted string value.

func RFC3339TimeEncoder 

func RFC3339TimeEncoder(t time.Time, enc PrimitiveArrayEncoder)

RFC3339TimeEncoder serializes a time.Time to an RFC3339-formatted string.

If enc supports AppendTimeLayout(t time.Time,layout string), it's used instead of appending a pre-formatted string value.

func SecondsDurationEncoder 

func SecondsDurationEncoder(d time.Duration, enc PrimitiveArrayEncoder)

SecondsDurationEncoder serializes a time.Duration to a floating-point number of seconds elapsed.

func ShortCallerEncoder 

func ShortCallerEncoder(caller EntryCaller, enc PrimitiveArrayEncoder)

ShortCallerEncoder serializes a caller in package/file:line format, trimming all but the final directory from the full path.

func StringDurationEncoder 

func StringDurationEncoder(d time.Duration, enc PrimitiveArrayEncoder)

StringDurationEncoder serializes a time.Duration using its built-in String method.

Types

type ArrayEncoder 

type ArrayEncoder interface {
	// Built-in types.
	PrimitiveArrayEncoder

	// Time-related types.
	AppendDuration(time.Duration)
	AppendTime(time.Time)

	// Logging-specific marshalers.
	AppendArray(ArrayMarshaler) error
	AppendObject(ObjectMarshaler) error

	// AppendReflected uses reflection to serialize arbitrary objects, so it's
	// slow and allocation-heavy.
	AppendReflected(value interface{}) error
}

ArrayEncoder is a strongly-typed, encoding-agnostic interface for adding array-like objects to the logging context. Of note, it supports mixed-type arrays even though they aren't typical in Go. Like slices, ArrayEncoders aren't safe for concurrent use (though typical use shouldn't require locks).

type ArrayMarshaler 

type ArrayMarshaler interface {
	MarshalLogArray(ArrayEncoder) error
}

ArrayMarshaler allows user-defined types to efficiently add themselves to the logging context, and to selectively omit information which shouldn't be included in logs (e.g., passwords).

Note: ArrayMarshaler is only used when zap.Array is used or when passed directly to zap.Any. It is not used when reflection-based encoding is used.

type ArrayMarshalerFunc 

type ArrayMarshalerFunc func(ArrayEncoder) error

ArrayMarshalerFunc is a type adapter that turns a function into an ArrayMarshaler.

func (ArrayMarshalerFunc) MarshalLogArray 

func (f ArrayMarshalerFunc) MarshalLogArray(enc ArrayEncoder) error

MarshalLogArray calls the underlying function.

type BufferedWriteSyncer 

type BufferedWriteSyncer struct {
	// WS is the WriteSyncer around which BufferedWriteSyncer will buffer
	// writes.
	//
	// This field is required.
	WS WriteSyncer

	// Size specifies the maximum amount of data the writer will buffered
	// before flushing.
	//
	// Defaults to 256 kB if unspecified.
	Size int

	// FlushInterval specifies how often the writer should flush data if
	// there have been no writes.
	//
	// Defaults to 30 seconds if unspecified.
	FlushInterval time.Duration

	// Clock, if specified, provides control of the source of time for the
	// writer.
	//
	// Defaults to the system clock.
	Clock Clock
	// contains filtered or unexported fields
}

A BufferedWriteSyncer is a WriteSyncer that buffers writes in-memory before flushing them to a wrapped WriteSyncer after reaching some limit, or at some fixed interval--whichever comes first.

BufferedWriteSyncer is safe for concurrent use. You don't need to use zapcore.Lock for WriteSyncers with BufferedWriteSyncer.

To set up a BufferedWriteSyncer, construct a WriteSyncer for your log destination (*os.File is a valid WriteSyncer), wrap it with BufferedWriteSyncer, and defer a Stop() call for when you no longer need the object. 

 func main() {
   ws := ... // your log destination
   bws := &zapcore.BufferedWriteSyncer{WS: ws}
   defer bws.Stop()

   // ...
   core := zapcore.NewCore(enc, bws, lvl)
   logger := zap.New(core)

   // ...
}

By default, a BufferedWriteSyncer will buffer up to 256 kilobytes of logs, waiting at most 30 seconds between flushes. You can customize these parameters by setting the Size or FlushInterval fields. For example, the following buffers up to 512 kB of logs before flushing them to Stderr, with a maximum of one minute between each flush. 

ws := &BufferedWriteSyncer{
  WS:            os.Stderr,
  Size:          512 * 1024, // 512 kB
  FlushInterval: time.Minute,
}
defer ws.Stop()

func (*BufferedWriteSyncer) Stop 

func (s *BufferedWriteSyncer) Stop() (err error)

Stop closes the buffer, cleans up background goroutines, and flushes remaining unwritten data.

func (*BufferedWriteSyncer) Sync 

func (s *BufferedWriteSyncer) Sync() error

Sync flushes buffered log data into disk directly.

func (*BufferedWriteSyncer) Write 

func (s *BufferedWriteSyncer) Write(bs []byte) (int, error)

Write writes log data into buffer syncer directly, multiple Write calls will be batched, and log data will be flushed to disk when the buffer is full or periodically.

type CallerEncoder 

type CallerEncoder func(EntryCaller, PrimitiveArrayEncoder)

A CallerEncoder serializes an EntryCaller to a primitive type.

This function must make exactly one call to a PrimitiveArrayEncoder's Append* method.

func (*CallerEncoder) UnmarshalText 

func (e *CallerEncoder) UnmarshalText(text []byte) error

UnmarshalText unmarshals text to a CallerEncoder. "full" is unmarshaled to FullCallerEncoder and anything else is unmarshaled to ShortCallerEncoder.

type CheckWriteAction 

type CheckWriteAction uint8

CheckWriteAction indicates what action to take after a log entry is processed. Actions are ordered in increasing severity. 

const (
	// WriteThenNoop indicates that nothing special needs to be done. It's the
	// default behavior.
	WriteThenNoop CheckWriteAction = iota
	// WriteThenGoexit runs runtime.Goexit after Write.
	WriteThenGoexit
	// WriteThenPanic causes a panic after Write.
	WriteThenPanic
	// WriteThenFatal causes an os.Exit(1) after Write.
	WriteThenFatal
)

func (CheckWriteAction) OnWrite 

func (a CheckWriteAction) OnWrite(ce *CheckedEntry, _ []Field)

OnWrite implements the OnWrite method to keep CheckWriteAction compatible with the new CheckWriteHook interface which deprecates CheckWriteAction.

type CheckWriteHook 

type CheckWriteHook interface {
	// OnWrite is invoked with the CheckedEntry that was written and a list
	// of fields added with that entry.
	//
	// The list of fields DOES NOT include fields that were already added
	// to the logger with the With method.
	OnWrite(*CheckedEntry, []Field)
}

CheckWriteHook is a custom action that may be executed after an entry is written.

Register one on a CheckedEntry with the After method. 

if ce := logger.Check(...); ce != nil {
  ce = ce.After(hook)
  ce.Write(...)
}

You can configure the hook for Fatal log statements at the logger level with the zap.WithFatalHook option.

type CheckedEntry 

type CheckedEntry struct {
	Entry
	ErrorOutput WriteSyncer
	// contains filtered or unexported fields
}

CheckedEntry is an Entry together with a collection of Cores that have already agreed to log it.

CheckedEntry references should be created by calling AddCore or After on a nil *CheckedEntry. References are returned to a pool after Write, and MUST NOT be retained after calling their Write method.

func (*CheckedEntry) AddCore 

func (ce *CheckedEntry) AddCore(ent Entry, core Core) *CheckedEntry

AddCore adds a Core that has agreed to log this CheckedEntry. It's intended to be used by Core.Check implementations, and is safe to call on nil CheckedEntry references.

func (*CheckedEntry) After 

func (ce *CheckedEntry) After(ent Entry, hook CheckWriteHook) *CheckedEntry

After sets this CheckEntry's CheckWriteHook, which will be called after this log entry has been written. It's safe to call this on nil CheckedEntry references.

func (*CheckedEntry) Should deprecated 

func (ce *CheckedEntry) Should(ent Entry, should CheckWriteAction) *CheckedEntry

Should sets this CheckedEntry's CheckWriteAction, which controls whether a Core will panic or fatal after writing this log entry. Like AddCore, it's safe to call on nil CheckedEntry references.

Deprecated: Use CheckedEntry.After instead.

func (*CheckedEntry) Write 

func (ce *CheckedEntry) Write(fields ...Field)

Write writes the entry to the stored Cores, returns any errors, and returns the CheckedEntry reference to a pool for immediate re-use. Finally, it executes any required CheckWriteAction.

type Clock 

type Clock interface {
	// Now returns the current local time.
	Now() time.Time

	// NewTicker returns *time.Ticker that holds a channel
	// that delivers "ticks" of a clock.
	NewTicker(time.Duration) *time.Ticker
}

Clock is a source of time for logged entries.

type Core 

type Core interface {
	LevelEnabler

	// With adds structured context to the Core.
	With([]Field) Core
	// Check determines whether the supplied Entry should be logged (using the
	// embedded LevelEnabler and possibly some extra logic). If the entry
	// should be logged, the Core adds itself to the CheckedEntry and returns
	// the result.
	//
	// Callers must use Check before calling Write.
	Check(Entry, *CheckedEntry) *CheckedEntry
	// Write serializes the Entry and any Fields supplied at the log site and
	// writes them to their destination.
	//
	// If called, Write should always log the Entry and Fields; it should not
	// replicate the logic of Check.
	Write(Entry, []Field) error
	// Sync flushes buffered logs (if any).
	Sync() error
}

Core is a minimal, fast logger interface. It's designed for library authors to wrap in a more user-friendly API.

func NewCore 

func NewCore(enc Encoder, ws WriteSyncer, enab LevelEnabler) Core

NewCore creates a Core that writes logs to a WriteSyncer.

func NewIncreaseLevelCore 

func NewIncreaseLevelCore(core Core, level LevelEnabler) (Core, error)

NewIncreaseLevelCore creates a core that can be used to increase the level of an existing Core. It cannot be used to decrease the logging level, as it acts as a filter before calling the underlying core. If level decreases the log level, an error is returned.

func NewLazyWith 

func NewLazyWith(core Core, fields []Field) Core

NewLazyWith wraps a Core with a "lazy" Core that will only encode fields if the logger is written to (or is further chained in a lon-lazy manner).

func NewNopCore 

func NewNopCore() Core

NewNopCore returns a no-op Core.

func NewSampler deprecated 

func NewSampler(core Core, tick time.Duration, first, thereafter int) Core

NewSampler creates a Core that samples incoming entries, which caps the CPU and I/O load of logging while attempting to preserve a representative subset of your logs.

Zap samples by logging the first N entries with a given level and message each tick. If more Entries with the same level and message are seen during the same interval, every Mth message is logged and the rest are dropped.

Keep in mind that zap's sampling implementation is optimized for speed over absolute precision; under load, each tick may be slightly over- or under-sampled.

Deprecated: use NewSamplerWithOptions.

func NewSamplerWithOptions 

func NewSamplerWithOptions(core Core, tick time.Duration, first, thereafter int, opts ...SamplerOption) Core

NewSamplerWithOptions creates a Core that samples incoming entries, which caps the CPU and I/O load of logging while attempting to preserve a representative subset of your logs.

Zap samples by logging the first N entries with a given level and message each tick. If more Entries with the same level and message are seen during the same interval, every Mth message is logged and the rest are dropped.

For example, 

core = NewSamplerWithOptions(core, time.Second, 10, 5)

This will log the first 10 log entries with the same level and message in a one second interval as-is. Following that, it will allow through every 5th log entry with the same level and message in that interval.

If thereafter is zero, the Core will drop all log entries after the first N in that interval.

Sampler can be configured to report sampling decisions with the SamplerHook option.

Keep in mind that Zap's sampling implementation is optimized for speed over absolute precision; under load, each tick may be slightly over- or under-sampled.

func NewTee 

func NewTee(cores ...Core) Core

NewTee creates a Core that duplicates log entries into two or more underlying Cores.

Calling it with a single Core returns the input unchanged, and calling it with no input returns a no-op Core.

func RegisterHooks 

func RegisterHooks(core Core, hooks ...func(Entry) error) Core

RegisterHooks wraps a Core and runs a collection of user-defined callback hooks each time a message is logged. Execution of the callbacks is blocking.

This offers users an easy way to register simple callbacks (e.g., metrics collection) without implementing the full Core interface.

type DurationEncoder 

type DurationEncoder func(time.Duration, PrimitiveArrayEncoder)

A DurationEncoder serializes a time.Duration to a primitive type.

This function must make exactly one call to a PrimitiveArrayEncoder's Append* method.

func (*DurationEncoder) UnmarshalText 

func (e *DurationEncoder) UnmarshalText(text []byte) error

UnmarshalText unmarshals text to a DurationEncoder. "string" is unmarshaled to StringDurationEncoder, and anything else is unmarshaled to NanosDurationEncoder.

type Encoder 

type Encoder interface {
	ObjectEncoder

	// Clone copies the encoder, ensuring that adding fields to the copy doesn't
	// affect the original.
	Clone() Encoder

	// EncodeEntry encodes an entry and fields, along with any accumulated
	// context, into a byte buffer and returns it. Any fields that are empty,
	// including fields on the `Entry` type, should be omitted.
	EncodeEntry(Entry, []Field) (*buffer.Buffer, error)
}

Encoder is a format-agnostic interface for all log entry marshalers. Since log encoders don't need to support the same wide range of use cases as general-purpose marshalers, it's possible to make them faster and lower-allocation.

Implementations of the ObjectEncoder interface's methods can, of course, freely modify the receiver. However, the Clone and EncodeEntry methods will be called concurrently and shouldn't modify the receiver.

func NewConsoleEncoder 

func NewConsoleEncoder(cfg EncoderConfig) Encoder

NewConsoleEncoder creates an encoder whose output is designed for human - rather than machine - consumption. It serializes the core log entry data (message, level, timestamp, etc.) in a plain-text format and leaves the structured context as JSON.

Note that although the console encoder doesn't use the keys specified in the encoder configuration, it will omit any element whose key is set to the empty string.

func NewJSONEncoder 

func NewJSONEncoder(cfg EncoderConfig) Encoder

NewJSONEncoder creates a fast, low-allocation JSON encoder. The encoder appropriately escapes all field keys and values.

Note that the encoder doesn't deduplicate keys, so it's possible to produce a message like 

{"foo":"bar","foo":"baz"}

This is permitted by the JSON specification, but not encouraged. Many libraries will ignore duplicate key-value pairs (typically keeping the last pair) when unmarshaling, but users should attempt to avoid adding duplicate keys.

type EncoderConfig 

type EncoderConfig struct {
	// Set the keys used for each log entry. If any key is empty, that portion
	// of the entry is omitted.
	MessageKey     string `json:"messageKey" yaml:"messageKey"`
	LevelKey       string `json:"levelKey" yaml:"levelKey"`
	TimeKey        string `json:"timeKey" yaml:"timeKey"`
	NameKey        string `json:"nameKey" yaml:"nameKey"`
	CallerKey      string `json:"callerKey" yaml:"callerKey"`
	FunctionKey    string `json:"functionKey" yaml:"functionKey"`
	StacktraceKey  string `json:"stacktraceKey" yaml:"stacktraceKey"`
	SkipLineEnding bool   `json:"skipLineEnding" yaml:"skipLineEnding"`
	LineEnding     string `json:"lineEnding" yaml:"lineEnding"`
	// Configure the primitive representations of common complex types. For
	// example, some users may want all time.Times serialized as floating-point
	// seconds since epoch, while others may prefer ISO8601 strings.
	EncodeLevel    LevelEncoder    `json:"levelEncoder" yaml:"levelEncoder"`
	EncodeTime     TimeEncoder     `json:"timeEncoder" yaml:"timeEncoder"`
	EncodeDuration DurationEncoder `json:"durationEncoder" yaml:"durationEncoder"`
	EncodeCaller   CallerEncoder   `json:"callerEncoder" yaml:"callerEncoder"`
	// Unlike the other primitive type encoders, EncodeName is optional. The
	// zero value falls back to FullNameEncoder.
	EncodeName NameEncoder `json:"nameEncoder" yaml:"nameEncoder"`
	// Configure the encoder for interface{} type objects.
	// If not provided, objects are encoded using json.Encoder
	NewReflectedEncoder func(io.Writer) ReflectedEncoder `json:"-" yaml:"-"`
	// Configures the field separator used by the console encoder. Defaults
	// to tab.
	ConsoleSeparator string `json:"consoleSeparator" yaml:"consoleSeparator"`
}

An EncoderConfig allows users to configure the concrete encoders supplied by zapcore.

type Entry 

type Entry struct {
	Level      Level
	Time       time.Time
	LoggerName string
	Message    string
	Caller     EntryCaller
	Stack      string
}

An Entry represents a complete log message. The entry's structured context is already serialized, but the log level, time, message, and call site information are available for inspection and modification. Any fields left empty will be omitted when encoding.

Entries are pooled, so any functions that accept them MUST be careful not to retain references to them.

type EntryCaller 

type EntryCaller struct {
	Defined  bool
	PC       uintptr
	File     string
	Line     int
	Function string
}

EntryCaller represents the caller of a logging function.

func NewEntryCaller 

func NewEntryCaller(pc uintptr, file string, line int, ok bool) EntryCaller

NewEntryCaller makes an EntryCaller from the return signature of runtime.Caller.

func (EntryCaller) FullPath 

func (ec EntryCaller) FullPath() string

FullPath returns a /full/path/to/package/file:line description of the caller.

func (EntryCaller) String 

func (ec EntryCaller) String() string

String returns the full path and line number of the caller.

func (EntryCaller) TrimmedPath 

func (ec EntryCaller) TrimmedPath() string

TrimmedPath returns a package/file:line description of the caller, preserving only the leaf directory name and file name.

type Field 

type Field struct {
	Key       string
	Type      FieldType
	Integer   int64
	String    string
	Interface interface{}
}

A Field is a marshaling operation used to add a key-value pair to a logger's context. Most fields are lazily marshaled, so it's inexpensive to add fields to disabled debug-level log statements.

func (Field) AddTo 

func (f Field) AddTo(enc ObjectEncoder)

AddTo exports a field through the ObjectEncoder interface. It's primarily useful to library authors, and shouldn't be necessary in most applications.

func (Field) Equals 

func (f Field) Equals(other Field) bool

Equals returns whether two fields are equal. For non-primitive types such as errors, marshalers, or reflect types, it uses reflect.DeepEqual.

type FieldType 

type FieldType uint8

A FieldType indicates which member of the Field union struct should be used and how it should be serialized. 

const (
	// UnknownType is the default field type. Attempting to add it to an encoder will panic.
	UnknownType FieldType = iota
	// ArrayMarshalerType indicates that the field carries an ArrayMarshaler.
	ArrayMarshalerType
	// ObjectMarshalerType indicates that the field carries an ObjectMarshaler.
	ObjectMarshalerType
	// BinaryType indicates that the field carries an opaque binary blob.
	BinaryType
	// BoolType indicates that the field carries a bool.
	BoolType
	// ByteStringType indicates that the field carries UTF-8 encoded bytes.
	ByteStringType
	// Complex128Type indicates that the field carries a complex128.
	Complex128Type
	// Complex64Type indicates that the field carries a complex64.
	Complex64Type
	// DurationType indicates that the field carries a time.Duration.
	DurationType
	// Float64Type indicates that the field carries a float64.
	Float64Type
	// Float32Type indicates that the field carries a float32.
	Float32Type
	// Int64Type indicates that the field carries an int64.
	Int64Type
	// Int32Type indicates that the field carries an int32.
	Int32Type
	// Int16Type indicates that the field carries an int16.
	Int16Type
	// Int8Type indicates that the field carries an int8.
	Int8Type
	// StringType indicates that the field carries a string.
	StringType
	// TimeType indicates that the field carries a time.Time that is
	// representable by a UnixNano() stored as an int64.
	TimeType
	// TimeFullType indicates that the field carries a time.Time stored as-is.
	TimeFullType
	// Uint64Type indicates that the field carries a uint64.
	Uint64Type
	// Uint32Type indicates that the field carries a uint32.
	Uint32Type
	// Uint16Type indicates that the field carries a uint16.
	Uint16Type
	// Uint8Type indicates that the field carries a uint8.
	Uint8Type
	// UintptrType indicates that the field carries a uintptr.
	UintptrType
	// ReflectType indicates that the field carries an interface{}, which should
	// be serialized using reflection.
	ReflectType
	// NamespaceType signals the beginning of an isolated namespace. All
	// subsequent fields should be added to the new namespace.
	NamespaceType
	// StringerType indicates that the field carries a fmt.Stringer.
	StringerType
	// ErrorType indicates that the field carries an error.
	ErrorType
	// SkipType indicates that the field is a no-op.
	SkipType

	// InlineMarshalerType indicates that the field carries an ObjectMarshaler
	// that should be inlined.
	InlineMarshalerType
)

type Level 

type Level int8

A Level is a logging priority. Higher levels are more important. 

const (
	// DebugLevel logs are typically voluminous, and are usually disabled in
	// production.
	DebugLevel Level = iota - 1
	// InfoLevel is the default logging priority.
	InfoLevel
	// WarnLevel logs are more important than Info, but don't need individual
	// human review.
	WarnLevel
	// ErrorLevel logs are high-priority. If an application is running smoothly,
	// it shouldn't generate any error-level logs.
	ErrorLevel
	// DPanicLevel logs are particularly important errors. In development the
	// logger panics after writing the message.
	DPanicLevel
	// PanicLevel logs a message, then panics.
	PanicLevel
	// FatalLevel logs a message, then calls os.Exit(1).
	FatalLevel

	// InvalidLevel is an invalid value for Level.
	//
	// Core implementations may panic if they see messages of this level.
	InvalidLevel = _maxLevel + 1
)

func LevelOf 

func LevelOf(enab LevelEnabler) Level

LevelOf reports the minimum enabled log level for the given LevelEnabler from Zap's supported log levels, or InvalidLevel if none of them are enabled.

A LevelEnabler may implement a 'Level() Level' method to override the behavior of this function. 

func (c *core) Level() Level {
	return c.currentLevel
}

It is recommended that Core implementations that wrap other cores use LevelOf to retrieve the level of the wrapped core. For example, 

func (c *coreWrapper) Level() Level {
	return zapcore.LevelOf(c.wrappedCore)
}

func ParseLevel 

func ParseLevel(text string) (Level, error)

ParseLevel parses a level based on the lower-case or all-caps ASCII representation of the log level. If the provided ASCII representation is invalid an error is returned.

This is particularly useful when dealing with text input to configure log levels.

func (Level) CapitalString 

func (l Level) CapitalString() string

CapitalString returns an all-caps ASCII representation of the log level.

func (Level) Enabled 

func (l Level) Enabled(lvl Level) bool

Enabled returns true if the given level is at or above this level.

func (*Level) Get 

func (l *Level) Get() interface{}

Get gets the level for the flag.Getter interface.

func (Level) MarshalText 

func (l Level) MarshalText() ([]byte, error)

MarshalText marshals the Level to text. Note that the text representation drops the -Level suffix (see example).

func (*Level) Set 

func (l *Level) Set(s string) error

Set sets the level for the flag.Value interface.

func (Level) String 

func (l Level) String() string

String returns a lower-case ASCII representation of the log level.

func (*Level) UnmarshalText 

func (l *Level) UnmarshalText(text []byte) error

UnmarshalText unmarshals text to a level. Like MarshalText, UnmarshalText expects the text representation of a Level to drop the -Level suffix (see example).

In particular, this makes it easy to configure logging levels using YAML, TOML, or JSON files.

type LevelEnabler 

type LevelEnabler interface {
	Enabled(Level) bool
}

LevelEnabler decides whether a given logging level is enabled when logging a message.

Enablers are intended to be used to implement deterministic filters; concerns like sampling are better implemented as a Core.

Each concrete Level value implements a static LevelEnabler which returns true for itself and all higher logging levels. For example WarnLevel.Enabled() will return true for WarnLevel, ErrorLevel, DPanicLevel, PanicLevel, and FatalLevel, but return false for InfoLevel and DebugLevel.

type LevelEncoder 

type LevelEncoder func(Level, PrimitiveArrayEncoder)

A LevelEncoder serializes a Level to a primitive type.

This function must make exactly one call to a PrimitiveArrayEncoder's Append* method.

func (*LevelEncoder) UnmarshalText 

func (e *LevelEncoder) UnmarshalText(text []byte) error

UnmarshalText unmarshals text to a LevelEncoder. "capital" is unmarshaled to CapitalLevelEncoder, "coloredCapital" is unmarshaled to CapitalColorLevelEncoder, "colored" is unmarshaled to LowercaseColorLevelEncoder, and anything else is unmarshaled to LowercaseLevelEncoder.

type MapObjectEncoder 

type MapObjectEncoder struct {
	// Fields contains the entire encoded log context.
	Fields map[string]interface{}
	// contains filtered or unexported fields
}

MapObjectEncoder is an ObjectEncoder backed by a simple map[string]interface{}. It's not fast enough for production use, but it's helpful in tests.

func NewMapObjectEncoder 

func NewMapObjectEncoder() *MapObjectEncoder

NewMapObjectEncoder creates a new map-backed ObjectEncoder.

func (*MapObjectEncoder) AddArray 

func (m *MapObjectEncoder) AddArray(key string, v ArrayMarshaler) error

AddArray implements ObjectEncoder.

func (*MapObjectEncoder) AddBinary 

func (m *MapObjectEncoder) AddBinary(k string, v []byte)

AddBinary implements ObjectEncoder.

func (*MapObjectEncoder) AddBool 

func (m *MapObjectEncoder) AddBool(k string, v bool)

AddBool implements ObjectEncoder.

func (*MapObjectEncoder) AddByteString 

func (m *MapObjectEncoder) AddByteString(k string, v []byte)

AddByteString implements ObjectEncoder.

func (*MapObjectEncoder) AddComplex128 

func (m *MapObjectEncoder) AddComplex128(k string, v complex128)

AddComplex128 implements ObjectEncoder.

func (*MapObjectEncoder) AddComplex64 

func (m *MapObjectEncoder) AddComplex64(k string, v complex64)

AddComplex64 implements ObjectEncoder.

func (MapObjectEncoder) AddDuration 

func (m MapObjectEncoder) AddDuration(k string, v time.Duration)

AddDuration implements ObjectEncoder.

func (*MapObjectEncoder) AddFloat32 

func (m *MapObjectEncoder) AddFloat32(k string, v float32)

AddFloat32 implements ObjectEncoder.

func (*MapObjectEncoder) AddFloat64 

func (m *MapObjectEncoder) AddFloat64(k string, v float64)

AddFloat64 implements ObjectEncoder.

func (*MapObjectEncoder) AddInt 

func (m *MapObjectEncoder) AddInt(k string, v int)

AddInt implements ObjectEncoder.

func (*MapObjectEncoder) AddInt16 

func (m *MapObjectEncoder) AddInt16(k string, v int16)

AddInt16 implements ObjectEncoder.

func (*MapObjectEncoder) AddInt32 

func (m *MapObjectEncoder) AddInt32(k string, v int32)

AddInt32 implements ObjectEncoder.

func (*MapObjectEncoder) AddInt64 

func (m *MapObjectEncoder) AddInt64(k string, v int64)

AddInt64 implements ObjectEncoder.

func (*MapObjectEncoder) AddInt8 

func (m *MapObjectEncoder) AddInt8(k string, v int8)

AddInt8 implements ObjectEncoder.

func (*MapObjectEncoder) AddObject 

func (m *MapObjectEncoder) AddObject(k string, v ObjectMarshaler) error

AddObject implements ObjectEncoder.

func (*MapObjectEncoder) AddReflected 

func (m *MapObjectEncoder) AddReflected(k string, v interface{}) error

AddReflected implements ObjectEncoder.

func (*MapObjectEncoder) AddString 

func (m *MapObjectEncoder) AddString(k string, v string)

AddString implements ObjectEncoder.

func (MapObjectEncoder) AddTime 

func (m MapObjectEncoder) AddTime(k string, v time.Time)

AddTime implements ObjectEncoder.

func (*MapObjectEncoder) AddUint 

func (m *MapObjectEncoder) AddUint(k string, v uint)

AddUint implements ObjectEncoder.

func (*MapObjectEncoder) AddUint16 

func (m *MapObjectEncoder) AddUint16(k string, v uint16)

AddUint16 implements ObjectEncoder.

func (*MapObjectEncoder) AddUint32 

func (m *MapObjectEncoder) AddUint32(k string, v uint32)

AddUint32 implements ObjectEncoder.

func (*MapObjectEncoder) AddUint64 

func (m *MapObjectEncoder) AddUint64(k string, v uint64)

AddUint64 implements ObjectEncoder.

func (*MapObjectEncoder) AddUint8 

func (m *MapObjectEncoder) AddUint8(k string, v uint8)

AddUint8 implements ObjectEncoder.

func (*MapObjectEncoder) AddUintptr 

func (m *MapObjectEncoder) AddUintptr(k string, v uintptr)

AddUintptr implements ObjectEncoder.

func (*MapObjectEncoder) OpenNamespace 

func (m *MapObjectEncoder) OpenNamespace(k string)

OpenNamespace implements ObjectEncoder.

type NameEncoder 

type NameEncoder func(string, PrimitiveArrayEncoder)

A NameEncoder serializes a period-separated logger name to a primitive type.

This function must make exactly one call to a PrimitiveArrayEncoder's Append* method.

func (*NameEncoder) UnmarshalText 

func (e *NameEncoder) UnmarshalText(text []byte) error

UnmarshalText unmarshals text to a NameEncoder. Currently, everything is unmarshaled to FullNameEncoder.

type ObjectEncoder 

type ObjectEncoder interface {
	// Logging-specific marshalers.
	AddArray(key string, marshaler ArrayMarshaler) error
	AddObject(key string, marshaler ObjectMarshaler) error

	// Built-in types.
	AddBinary(key string, value []byte)     // for arbitrary bytes
	AddByteString(key string, value []byte) // for UTF-8 encoded bytes
	AddBool(key string, value bool)
	AddComplex128(key string, value complex128)
	AddComplex64(key string, value complex64)
	AddDuration(key string, value time.Duration)
	AddFloat64(key string, value float64)
	AddFloat32(key string, value float32)
	AddInt(key string, value int)
	AddInt64(key string, value int64)
	AddInt32(key string, value int32)
	AddInt16(key string, value int16)
	AddInt8(key string, value int8)
	AddString(key, value string)
	AddTime(key string, value time.Time)
	AddUint(key string, value uint)
	AddUint64(key string, value uint64)
	AddUint32(key string, value uint32)
	AddUint16(key string, value uint16)
	AddUint8(key string, value uint8)
	AddUintptr(key string, value uintptr)

	// AddReflected uses reflection to serialize arbitrary objects, so it can be
	// slow and allocation-heavy.
	AddReflected(key string, value interface{}) error
	// OpenNamespace opens an isolated namespace where all subsequent fields will
	// be added. Applications can use namespaces to prevent key collisions when
	// injecting loggers into sub-components or third-party libraries.
	OpenNamespace(key string)
}

ObjectEncoder is a strongly-typed, encoding-agnostic interface for adding a map- or struct-like object to the logging context. Like maps, ObjectEncoders aren't safe for concurrent use (though typical use shouldn't require locks).

type ObjectMarshaler 

type ObjectMarshaler interface {
	MarshalLogObject(ObjectEncoder) error
}

ObjectMarshaler allows user-defined types to efficiently add themselves to the logging context, and to selectively omit information which shouldn't be included in logs (e.g., passwords).

Note: ObjectMarshaler is only used when zap.Object is used or when passed directly to zap.Any. It is not used when reflection-based encoding is used.

type ObjectMarshalerFunc 

type ObjectMarshalerFunc func(ObjectEncoder) error

ObjectMarshalerFunc is a type adapter that turns a function into an ObjectMarshaler.

func (ObjectMarshalerFunc) MarshalLogObject 

func (f ObjectMarshalerFunc) MarshalLogObject(enc ObjectEncoder) error

MarshalLogObject calls the underlying function.

type PrimitiveArrayEncoder 

type PrimitiveArrayEncoder interface {
	// Built-in types.
	AppendBool(bool)
	AppendByteString([]byte) // for UTF-8 encoded bytes
	AppendComplex128(complex128)
	AppendComplex64(complex64)
	AppendFloat64(float64)
	AppendFloat32(float32)
	AppendInt(int)
	AppendInt64(int64)
	AppendInt32(int32)
	AppendInt16(int16)
	AppendInt8(int8)
	AppendString(string)
	AppendUint(uint)
	AppendUint64(uint64)
	AppendUint32(uint32)
	AppendUint16(uint16)
	AppendUint8(uint8)
	AppendUintptr(uintptr)
}

PrimitiveArrayEncoder is the subset of the ArrayEncoder interface that deals only in Go's built-in types. It's included only so that Duration- and TimeEncoders cannot trigger infinite recursion.

type ReflectedEncoder 

type ReflectedEncoder interface {
	// Encode encodes and writes to the underlying data stream.
	Encode(interface{}) error
}

ReflectedEncoder serializes log fields that can't be serialized with Zap's JSON encoder. These have the ReflectType field type. Use EncoderConfig.NewReflectedEncoder to set this.

type SamplerOption 

type SamplerOption interface {
	// contains filtered or unexported methods
}

SamplerOption configures a Sampler.

func SamplerHook 

func SamplerHook(hook func(entry Entry, dec SamplingDecision)) SamplerOption

SamplerHook registers a function which will be called when Sampler makes a decision.

This hook may be used to get visibility into the performance of the sampler. For example, use it to track metrics of dropped versus sampled logs. 

var dropped atomic.Int64
zapcore.SamplerHook(func(ent zapcore.Entry, dec zapcore.SamplingDecision) {
  if dec&zapcore.LogDropped > 0 {
    dropped.Inc()
  }
})

type SamplingDecision 

type SamplingDecision uint32

SamplingDecision is a decision represented as a bit field made by sampler. More decisions may be added in the future. 

const (
	// LogDropped indicates that the Sampler dropped a log entry.
	LogDropped SamplingDecision = 1 << iota
	// LogSampled indicates that the Sampler sampled a log entry.
	LogSampled
)

type TimeEncoder 

type TimeEncoder func(time.Time, PrimitiveArrayEncoder)

A TimeEncoder serializes a time.Time to a primitive type.

This function must make exactly one call to a PrimitiveArrayEncoder's Append* method.

func TimeEncoderOfLayout 

func TimeEncoderOfLayout(layout string) TimeEncoder

TimeEncoderOfLayout returns TimeEncoder which serializes a time.Time using given layout.

func (*TimeEncoder) UnmarshalJSON 

func (e *TimeEncoder) UnmarshalJSON(data []byte) error

UnmarshalJSON unmarshals JSON to a TimeEncoder as same way UnmarshalYAML does.

func (*TimeEncoder) UnmarshalText 

func (e *TimeEncoder) UnmarshalText(text []byte) error

UnmarshalText unmarshals text to a TimeEncoder. "rfc3339nano" and "RFC3339Nano" are unmarshaled to RFC3339NanoTimeEncoder. "rfc3339" and "RFC3339" are unmarshaled to RFC3339TimeEncoder. "iso8601" and "ISO8601" are unmarshaled to ISO8601TimeEncoder. "millis" is unmarshaled to EpochMillisTimeEncoder. "nanos" is unmarshaled to EpochNanosEncoder. Anything else is unmarshaled to EpochTimeEncoder.

func (*TimeEncoder) UnmarshalYAML 

func (e *TimeEncoder) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML unmarshals YAML to a TimeEncoder. If value is an object with a "layout" field, it will be unmarshaled to TimeEncoder with given layout. 

timeEncoder:
  layout: 06/01/02 03:04pm

If value is string, it uses UnmarshalText. 

timeEncoder: iso8601

type WriteSyncer 

type WriteSyncer interface {
	io.Writer
	Sync() error
}

A WriteSyncer is an io.Writer that can also flush any buffered data. Note that *os.File (and thus, os.Stderr and os.Stdout) implement WriteSyncer.

func AddSync 

func AddSync(w io.Writer) WriteSyncer

AddSync converts an io.Writer to a WriteSyncer. It attempts to be intelligent: if the concrete type of the io.Writer implements WriteSyncer, we'll use the existing Sync method. If it doesn't, we'll add a no-op Sync.

func Lock 

func Lock(ws WriteSyncer) WriteSyncer

Lock wraps a WriteSyncer in a mutex to make it safe for concurrent use. In particular, *os.Files must be locked before use.

func NewMultiWriteSyncer 

func NewMultiWriteSyncer(ws ...WriteSyncer) WriteSyncer

NewMultiWriteSyncer creates a WriteSyncer that duplicates its writes and sync calls, much like io.MultiWriter.

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