tailfile

package
Version: v0.0.0-...-2a1168f Latest Latest
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Published: Mar 23, 2020 License: Apache-2.0 Imports: 6 Imported by: 0

Documentation

Overview

Package tailfile provides helper functions to read the nth lines of any ReadSeeker.

Index

Constants

This section is empty.

Variables

View Source
var ErrNonPositiveLinesNumber = errors.New("The number of lines to extract from the file must be positive")

ErrNonPositiveLinesNumber is an error returned if the lines number was negative.

Functions

func NewTailReader

func NewTailReader(ctx context.Context, r SizeReaderAt, reqLines int) (io.Reader, int, error)

NewTailReader scopes the passed in reader to just the last N lines passed in

func NewTailReaderWithDelimiter

func NewTailReaderWithDelimiter(ctx context.Context, r SizeReaderAt, reqLines int, delimiter []byte) (io.Reader, int, error)

NewTailReaderWithDelimiter scopes the passed in reader to just the last N lines passed in In this case a "line" is defined by the passed in delimiter.

Delimiter lengths should be generally small, no more than 12 bytes

func TailFile

func TailFile(f *os.File, n int) ([][]byte, error)

TailFile returns last n lines of the passed in file.

Types

type SizeReaderAt

type SizeReaderAt interface {
	io.ReaderAt
	Size() int64
}

SizeReaderAt is an interface used to get a ReaderAt as well as the size of the underlying reader. Note that the size of the underlying reader should not change when using this interface.

Source Files

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