streamlog

Documentation

Overview

Package streamlog provides a non-blocking message broadcaster.

Index

• Constants
• func GetQueryLogFormat() string
• func GetRedactDebugUIQueries() bool
• func SetQueryLogFilterTag(newQueryLogFilterTag string)
• func SetQueryLogFormat(newQueryLogFormat string)
• func SetQueryLogRowThreshold(newQueryLogRowThreshold uint64)
• func SetQueryLogSampleRate(sampleRate float64)
• func SetRedactDebugUIQueries(newRedactDebugUIQueries bool)
• func ShouldEmitLog(sql string, rowsAffected, rowsReturned uint64) bool
• type Formatter
• type LogFormatter
  • func GetFormatter[T any](logger *StreamLogger[T]) LogFormatter
• type StreamLogger
  • func New[T any](name string, size int) *StreamLogger[T]
  • func (logger *StreamLogger[T]) LogToFile(path string, logf LogFormatter) (chan T, error)
  • func (logger *StreamLogger[T]) Name() string
  • func (logger *StreamLogger[T]) Send(message T)
  • func (logger *StreamLogger[T]) ServeLogs(url string, logf LogFormatter)
  • func (logger *StreamLogger[T]) Subscribe(name string) chan T
  • func (logger *StreamLogger[T]) Unsubscribe(ch chan T)

Constants

const (
	// QueryLogFormatText is the format specifier for text querylog output
	QueryLogFormatText = "text"

	// QueryLogFormatJSON is the format specifier for json querylog output
	QueryLogFormatJSON = "json"
)

Functions

func GetQueryLogFormat

func GetQueryLogFormat() string

func GetRedactDebugUIQueries

func GetRedactDebugUIQueries() bool

func SetQueryLogFilterTag

func SetQueryLogFilterTag(newQueryLogFilterTag string)

func SetQueryLogFormat

func SetQueryLogFormat(newQueryLogFormat string)

func SetQueryLogRowThreshold

func SetQueryLogRowThreshold(newQueryLogRowThreshold uint64)

func SetQueryLogSampleRate

func SetQueryLogSampleRate(sampleRate float64)

func SetRedactDebugUIQueries

func SetRedactDebugUIQueries(newRedactDebugUIQueries bool)

func ShouldEmitLog

func ShouldEmitLog(sql string, rowsAffected, rowsReturned uint64) bool

ShouldEmitLog returns whether the log with the given SQL query should be emitted or filtered

Types

type Formatter

type Formatter interface {
	Logf(io.Writer, url.Values) error
}

Formatter is a simple interface for objects that expose a Format function as needed for streamlog.

type LogFormatter

type LogFormatter func(out io.Writer, params url.Values, message any) error

LogFormatter is the function signature used to format an arbitrary message for the given output writer.

func GetFormatter

func GetFormatter[T any](logger *StreamLogger[T]) LogFormatter

GetFormatter returns a formatter function for objects conforming to the Formatter interface

type StreamLogger

type StreamLogger[T any] struct {
	// contains filtered or unexported fields
}

StreamLogger is a non-blocking broadcaster of messages. Subscribers can use channels or HTTP.

func New

func New[T any](name string, size int) *StreamLogger[T]

New returns a new StreamLogger that can stream events to subscribers. The size parameter defines the channel size for the subscribers.

func (*StreamLogger[T]) LogToFile

func (logger *StreamLogger[T]) LogToFile(path string, logf LogFormatter) (chan T, error)

LogToFile starts logging to the specified file path and will reopen the file in response to SIGUSR2.

Returns the channel used for the subscription which can be used to close it.

func (*StreamLogger[T]) Name

func (logger *StreamLogger[T]) Name() string

Name returns the name of StreamLogger.

func (*StreamLogger[T]) Send

func (logger *StreamLogger[T]) Send(message T)

Send sends message to all the writers subscribed to logger. Calling Send does not block.

func (*StreamLogger[T]) ServeLogs

func (logger *StreamLogger[T]) ServeLogs(url string, logf LogFormatter)

ServeLogs registers the URL on which messages will be broadcast. It is safe to register multiple URLs for the same StreamLogger.

func (*StreamLogger[T]) Subscribe

func (logger *StreamLogger[T]) Subscribe(name string) chan T

Subscribe returns a channel which can be used to listen for messages.

func (*StreamLogger[T]) Unsubscribe

func (logger *StreamLogger[T]) Unsubscribe(ch chan T)

Unsubscribe removes the channel from the subscription.