file

Documentation

Index

• Constants
• func IntervalLogIndex(filename string) (uint64, int, error)
• func IsRemoved(f *os.File) bool
• func OrderIntervalLogs(filename string) string
• func ReadOpen(path string) (*os.File, error)
• func RedirectStandardError(toFile *os.File) error
• func SafeFileRotate(path, tempfile string) error
• type FileInfo
  • func Lstat(name string) (FileInfo, error)
  • func Stat(name string) (FileInfo, error)
  • func Wrap(info os.FileInfo) (FileInfo, error)
• type Logger
• type Rotator
  • func NewFileRotator(filename string, options ...RotatorOption) (*Rotator, error)
  • func (r *Rotator) Close() error
  • func (r *Rotator) Rotate() error
  • func (r *Rotator) Sync() error
  • func (r *Rotator) Write(data []byte) (int, error)
• type RotatorOption
  • func Interval(d time.Duration) RotatorOption
  • func MaxBackups(n uint) RotatorOption
  • func MaxSizeBytes(n uint) RotatorOption
  • func Permissions(m os.FileMode) RotatorOption
  • func RedirectStderr(redirect bool) RotatorOption
  • func RotateOnStartup(b bool) RotatorOption
  • func WithLogger(l Logger) RotatorOption
• type StateOS
  • func GetOSState(info os.FileInfo) StateOS
  • func (fs StateOS) IsSame(state StateOS) bool
  • func (fs StateOS) String() string

Constants

const MaxBackupsLimit = 1024

MaxBackupsLimit is the upper bound on the number of backup files. Any values greater will result in an error.

Functions

func IntervalLogIndex

func IntervalLogIndex(filename string) (uint64, int, error)

IntervalLogIndex returns n as int given a log filename in the form [prefix]-[formattedDate]-n

func IsRemoved

func IsRemoved(f *os.File) bool

IsRemoved checks wheter the file held by f is removed. On Windows IsRemoved reads the DeletePending flags using the GetFileInformationByHandleEx. A file is not removed/unlinked as long as at least one process still own a file handle. A delete file is only marked as deleted, and file attributes can still be read. Only opening a file marked with 'DeletePending' will fail.

func OrderIntervalLogs

func OrderIntervalLogs(filename string) string

OrderIntervalLogs, when given a log filename in the form [prefix]-[formattedDate]-n returns the filename after zero-padding the trailing n so that foo-[date]-2 sorts before foo-[date]-10.

func ReadOpen

func ReadOpen(path string) (*os.File, error)

ReadOpen opens a file for reading only As Windows blocks deleting a file when its open, some special params are passed here.

func RedirectStandardError

func RedirectStandardError(toFile *os.File) error

RedirectStandardError causes all standard error output to be directed to the given file.

func SafeFileRotate

func SafeFileRotate(path, tempfile string) error

SafeFileRotate safely rotates an existing file under path and replaces it with the tempfile

Types

type FileInfo

type FileInfo interface {
	os.FileInfo
	UID() (int, error) // UID of the file owner. Returns an error on non-POSIX file systems.
	GID() (int, error) // GID of the file owner. Returns an error on non-POSIX file systems.
}

A FileInfo describes a file and is returned by Stat and Lstat.

func Lstat

func Lstat(name string) (FileInfo, error)

Lstat returns a FileInfo describing the named file. If the file is a symbolic link, the returned FileInfo describes the symbolic link. Lstat makes no attempt to follow the link. If there is an error, it will be of type *PathError.

func Stat

func Stat(name string) (FileInfo, error)

Stat returns a FileInfo describing the named file. If there is an error, it will be of type *PathError.

func Wrap

func Wrap(info os.FileInfo) (FileInfo, error)

Wrap wraps the given os.FileInfo and returns a FileInfo in order to expose the UID and GID in a uniform manner across operating systems.

type Logger

type Logger interface {
	Debugw(msg string, keysAndValues map[string]interface{}) // Debug
}

Logger allows the rotator to write debug information.

type Rotator

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

Rotator is a io.WriteCloser that automatically rotates the file it is writing to when it reaches a maximum size and optionally on a time interval basis. It also purges the oldest rotated files when the maximum number of backups is reached.

func NewFileRotator

func NewFileRotator(filename string, options ...RotatorOption) (*Rotator, error)

NewFileRotator returns a new Rotator.

func (*Rotator) Close

func (r *Rotator) Close() error

Close closes the currently open file.

func (*Rotator) Rotate

func (r *Rotator) Rotate() error

Rotate triggers a file rotation.

func (*Rotator) Sync

func (r *Rotator) Sync() error

Sync commits the current contents of the file to stable storage. Typically, this means flushing the file system's in-memory copy of recently written data to disk.

func (*Rotator) Write

func (r *Rotator) Write(data []byte) (int, error)

Write writes the given bytes to the file. This implements io.Writer. If the write would trigger a rotation the rotation is done before writing to avoid going over the max size. Write is safe for concurrent use.

type RotatorOption

type RotatorOption func(r *Rotator)

RotatorOption is a configuration option for Rotator.

func Interval

func Interval(d time.Duration) RotatorOption

Interval sets the time interval for log rotation in addition to log rotation by size. The default is 0 for disabled.

func MaxBackups

func MaxBackups(n uint) RotatorOption

MaxBackups configures the maximum number of backup files to save (not counting the active file). The upper limit is 1024 on this value is. The default is 7.

func MaxSizeBytes

func MaxSizeBytes(n uint) RotatorOption

MaxSizeBytes configures the maximum number of bytes that a file should contain before being rotated. The default is 10 MiB.

func Permissions

func Permissions(m os.FileMode) RotatorOption

Permissions configures the file permissions to use for the file that the Rotator creates. The default is 0600.

func RedirectStderr

func RedirectStderr(redirect bool) RotatorOption

RedirectStderr causes all writes to standard error to be redirected to this rotator.

func RotateOnStartup

func RotateOnStartup(b bool) RotatorOption

RotateOnStartup immediately rotates files on startup rather than appending to the existing file. The default is true.

func WithLogger

func WithLogger(l Logger) RotatorOption

WithLogger injects a logger implementation for logging debug information. If no logger is injected then the no logging will occur.

type StateOS

type StateOS struct {
	IdxHi uint64 `json:"idxhi,"`
	IdxLo uint64 `json:"idxlo,"`
	Vol   uint64 `json:"vol,"`
}

func GetOSState

func GetOSState(info os.FileInfo) StateOS

GetOSState returns the platform specific StateOS

func (StateOS) IsSame

func (fs StateOS) IsSame(state StateOS) bool

IsSame file checks if the files are identical

func (StateOS) String

func (fs StateOS) String() string