Struct LogFile

daemon/logger/loggerutils/logfile.go:31–74

LogFile is Logger implementation for default Docker logging.

// LogFile is Logger implementation for default Docker logging.
type LogFile struct {
	mu       sync.Mutex // protects the logfile access
	closed   chan struct{}
	rotateMu sync.Mutex // blocks the next rotation until the current rotation is completed
	// Lock out readers while performing a non-atomic sequence of filesystem
	// operations (RLock: open, Lock: rename, delete).
	//
	// fsopMu should be locked for writing only while holding rotateMu.
	fsopMu sync.RWMutex

	// Logger configuration

	capacity int64 // maximum size of each file
	maxFiles int   // maximum number of files
	compress bool  // whether old versions of log files are compressed
	perms    os.FileMode

	// Log file codec

	createDecoder MakeDecoderFn
	getTailReader GetTailReaderFunc

	// Log reader state in a 1-buffered channel.
	//
	// Share memory by communicating: receive to acquire, send to release.
	// The state struct is passed around by value so that use-after-send
	// bugs cannot escalate to data races.
	//
	// A method which receives the state value takes ownership of it. The
	// owner is responsible for either passing ownership along or sending
	// the state back to the channel. By convention, the semantics of
	// passing along ownership is expressed with function argument types.
	// Methods which take a pointer *logReadState argument borrow the state,
	// analogous to functions which require a lock to be held when calling.
	// The caller retains ownership. Calling a method which takes a
	// value logFileState argument gives ownership to the callee.
	read chan logReadState

	decompress *sharedTempFileConverter

	pos           logPos    // Current log file write position.
	f             *os.File  // Current log file for writing.
	lastTimestamp time.Time // timestamp of the last log
}

type logPos struct {
	// Size of the current file.