logger

package
v20.10.5 Latest Latest
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 Go to latest Published: Feb 25, 2021 License: Apache-2.0 Imports: 25 Imported by: 0

Documentation

Overview

Package logger defines interfaces that logger drivers implement to log messages.

The other half of a logger driver is the implementation of the factory, which holds the contextual instance information that allows multiple loggers of the same type to perform different actions, such as logging to different locations.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func AddBuiltinLogOpts 

func AddBuiltinLogOpts(opts map[string]bool)

AddBuiltinLogOpts updates the list of built-in log opts. This allows other packages to supplement additional log options without having to register an actual log driver. This is used by things that are more proxy log drivers and should not be exposed as a usable log driver to the API. This should only be called on package initialization.

func ListDrivers 

func ListDrivers() []string

ListDrivers gets the list of registered log driver names

func PutMessage 

func PutMessage(msg *Message)

PutMessage puts the specified message back n the message pool. The message fields are reset before putting into the pool.

func RegisterExternalValidator 

func RegisterExternalValidator(v LogOptValidator)

RegisterExternalValidator adds the validator to the list of external validators. External validators are used by packages outside this package that need to add their own validation logic. This should only be called on package initialization.

func RegisterLogDriver 

func RegisterLogDriver(name string, c Creator) error

RegisterLogDriver registers the given logging driver builder with given logging driver name.

func RegisterLogOptValidator 

func RegisterLogOptValidator(name string, l LogOptValidator) error

RegisterLogOptValidator registers the logging option validator with the given logging driver name.

func RegisterPluginGetter 

func RegisterPluginGetter(plugingetter getter.PluginGetter)

RegisterPluginGetter sets the plugingetter

func ValidateLogOpts 

func ValidateLogOpts(name string, cfg map[string]string) error

ValidateLogOpts checks the options for the given log driver. The options supported are specific to the LogDriver implementation.

Types

type Capability 

type Capability struct {
	// Determines if a log driver can read back logs
	ReadLogs bool
}

Capability defines the list of capabilities that a driver can implement These capabilities are not required to be a logging driver, however do determine how a logging driver can be used

type Copier 

type Copier struct {
	// contains filtered or unexported fields
}

Copier can copy logs from specified sources to Logger and attach Timestamp. Writes are concurrent, so you need implement some sync in your logger.

func NewCopier 

func NewCopier(srcs map[string]io.Reader, dst Logger) *Copier

NewCopier creates a new Copier

func (*Copier) Close 

func (c *Copier) Close()

Close closes the copier

func (*Copier) Run 

func (c *Copier) Run()

Run starts logs copying

func (*Copier) Wait 

func (c *Copier) Wait()

Wait waits until all copying is done

type Creator 

type Creator func(Info) (Logger, error)

Creator builds a logging driver instance with given context.

func GetLogDriver 

func GetLogDriver(name string) (Creator, error)

GetLogDriver provides the logging driver builder for a logging driver name.

type ErrReadLogsNotSupported 

type ErrReadLogsNotSupported struct{}

ErrReadLogsNotSupported is returned when the underlying log driver does not support reading

func (ErrReadLogsNotSupported) Error 

func (ErrReadLogsNotSupported) Error() string

func (ErrReadLogsNotSupported) NotImplemented 

func (ErrReadLogsNotSupported) NotImplemented()

NotImplemented makes this error implement the `NotImplemented` interface from api/errdefs

type Info 

type Info struct {
	Config              map[string]string
	ContainerID         string
	ContainerName       string
	ContainerEntrypoint string
	ContainerArgs       []string
	ContainerImageID    string
	ContainerImageName  string
	ContainerCreated    time.Time
	ContainerEnv        []string
	ContainerLabels     map[string]string
	LogPath             string
	DaemonName          string
}

Info provides enough information for a logging driver to do its function.

func (*Info) Command 

func (info *Info) Command() string

Command returns the command that the container being logged was started with. The Entrypoint is prepended to the container arguments.

func (*Info) ExtraAttributes 

func (info *Info) ExtraAttributes(keyMod func(string) string) (map[string]string, error)

ExtraAttributes returns the user-defined extra attributes (labels, environment variables) in key-value format. This can be used by log drivers that support metadata to add more context to a log.

func (*Info) FullID 

func (info *Info) FullID() string

FullID is an alias of ContainerID.

func (*Info) Hostname 

func (info *Info) Hostname() (string, error)

Hostname returns the hostname from the underlying OS.

func (*Info) ID 

func (info *Info) ID() string

ID Returns the Container ID shortened to 12 characters.

func (*Info) ImageFullID 

func (info *Info) ImageFullID() string

ImageFullID is an alias of ContainerImageID.

func (*Info) ImageID 

func (info *Info) ImageID() string

ImageID returns the ContainerImageID shortened to 12 characters.

func (*Info) ImageName 

func (info *Info) ImageName() string

ImageName is an alias of ContainerImageName

func (*Info) Name 

func (info *Info) Name() string

Name returns the ContainerName without a preceding '/'.

type LogOptValidator 

type LogOptValidator func(cfg map[string]string) error

LogOptValidator checks the options specific to the underlying logging implementation.

type LogReader 

type LogReader interface {
	// Read logs from underlying logging backend
	ReadLogs(ReadConfig) *LogWatcher
}

LogReader is the interface for reading log messages for loggers that support reading.

type LogWatcher 

type LogWatcher struct {
	// For sending log messages to a reader.
	Msg chan *Message
	// For sending error messages that occur while reading logs.
	Err chan error
	// contains filtered or unexported fields
}

LogWatcher is used when consuming logs read from the LogReader interface.

func NewLogWatcher 

func NewLogWatcher() *LogWatcher

NewLogWatcher returns a new LogWatcher.

func (*LogWatcher) ConsumerGone 

func (w *LogWatcher) ConsumerGone()

ConsumerGone notifies that the logs consumer is gone.

func (*LogWatcher) ProducerGone 

func (w *LogWatcher) ProducerGone()

ProducerGone notifies the underlying log reader that the logs producer (a container) is gone.

func (*LogWatcher) WatchConsumerGone 

func (w *LogWatcher) WatchConsumerGone() <-chan struct{}

WatchConsumerGone returns a channel receiver that receives notification when the log watcher consumer is gone.

func (*LogWatcher) WatchProducerGone 

func (w *LogWatcher) WatchProducerGone() <-chan struct{}

WatchProducerGone returns a channel receiver that receives notification once the logs producer (a container) is gone.

type Logger 

type Logger interface {
	Log(*Message) error
	Name() string
	Close() error
}

Logger is the interface for docker logging drivers.

func NewRingLogger 

func NewRingLogger(driver Logger, logInfo Info, maxSize int64) Logger

NewRingLogger creates a new Logger that is implemented as a RingBuffer wrapping the passed in logger.

type MarshalFunc 

type MarshalFunc func(*Message) ([]byte, error)

MarshalFunc is a func that marshals a message into an arbitrary format

type Message 

type Message backend.LogMessage

Message is data structure that represents piece of output produced by some container. The Line member is a slice of an array whose contents can be changed after a log driver's Log() method returns.

Message is subtyped from backend.LogMessage because there is a lot of internal complexity around the Message type that should not be exposed to any package not explicitly importing the logger type.

Any changes made to this struct must also be updated in the `reset` function

func NewMessage 

func NewMessage() *Message

NewMessage returns a new message from the message sync.Pool

func (*Message) AsLogMessage 

func (m *Message) AsLogMessage() *backend.LogMessage

AsLogMessage returns a pointer to the message as a pointer to backend.LogMessage, which is an identical type with a different purpose

type ReadConfig 

type ReadConfig struct {
	Since  time.Time
	Until  time.Time
	Tail   int
	Follow bool
}

ReadConfig is the configuration passed into ReadLogs.

type RingLogger 

type RingLogger struct {
	// contains filtered or unexported fields
}

RingLogger is a ring buffer that implements the Logger interface. This is used when lossy logging is OK.

func (*RingLogger) BufSize added in v20.10.4 

func (r *RingLogger) BufSize() int

BufSize returns the buffer size of the underlying logger. Returns -1 if the logger doesn't match SizedLogger interface.

func (*RingLogger) Close 

func (r *RingLogger) Close() error

Close closes the logger

func (*RingLogger) Log 

func (r *RingLogger) Log(msg *Message) error

Log queues messages into the ring buffer

func (*RingLogger) Name 

func (r *RingLogger) Name() string

Name returns the name of the underlying logger

type SizedLogger 

type SizedLogger interface {
	Logger
	BufSize() int
}

SizedLogger is the interface for logging drivers that can control the size of buffer used for their messages.

Source Files

View all Source files

Directories

Path Synopsis
Package awslogs provides the logdriver for forwarding container logs to Amazon CloudWatch Logs
 Package awslogs provides the logdriver for forwarding container logs to Amazon CloudWatch Logs
Package etwlogs provides a log driver for forwarding container logs as ETW events.(ETW stands for Event Tracing for Windows) A client can then create an ETW listener to listen for events that are sent by the ETW provider that we register, using the provider's GUID "a3693192-9ed6-46d2-a981-f8226c8363bd".
 Package etwlogs provides a log driver for forwarding container logs as ETW events.(ETW stands for Event Tracing for Windows) A client can then create an ETW listener to listen for events that are sent by the ETW provider that we register, using the provider's GUID "a3693192-9ed6-46d2-a981-f8226c8363bd".
Package fluentd provides the log driver for forwarding server logs to fluentd endpoints.
 Package fluentd provides the log driver for forwarding server logs to fluentd endpoints.
Package gelf provides the log driver for forwarding server logs to endpoints that support the Graylog Extended Log Format.
 Package gelf provides the log driver for forwarding server logs to endpoints that support the Graylog Extended Log Format.
Package journald provides the log driver for forwarding server logs to endpoints that receive the systemd format.
 Package journald provides the log driver for forwarding server logs to endpoints that receive the systemd format.
Package jsonfilelog provides the default Logger implementation for Docker logging.
 Package jsonfilelog provides the default Logger implementation for Docker logging.
jsonlog
Package local provides a logger implementation that stores logs on disk.
 Package local provides a logger implementation that stores logs on disk.
Package logentries provides the log driver for forwarding server logs to logentries endpoints.
 Package logentries provides the log driver for forwarding server logs to logentries endpoints.
cache
Package splunk provides the log driver for forwarding server logs to Splunk HTTP Event Collector endpoint.
 Package splunk provides the log driver for forwarding server logs to Splunk HTTP Event Collector endpoint.
Package syslog provides the logdriver for forwarding server logs to syslog endpoints.
 Package syslog provides the logdriver for forwarding server logs to syslog endpoints.

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