Go 语言标准库

package iotest

import "testing/iotest"

Package iotest implements Readers and Writers useful mainly for testing.

• Variables
• func DataErrReader(r io.Reader) io.Reader
• func HalfReader(r io.Reader) io.Reader
• func NewReadLogger(prefix string, r io.Reader) io.Reader
• func NewWriteLogger(prefix string, w io.Writer) io.Writer
• func OneByteReader(r io.Reader) io.Reader
• func TimeoutReader(r io.Reader) io.Reader
• func TruncateWriter(w io.Writer, n int64) io.Writer

Package Files ¶

logger.go reader.go writer.go

Variables ¶

var ErrTimeout = errors.New("timeout")

func DataErrReader ¶ Uses

func DataErrReader(r io.Reader) io.Reader

DataErrReader changes the way errors are handled by a Reader. Normally, a Reader returns an error (typically EOF) from the first Read call after the last piece of data is read. DataErrReader wraps a Reader and changes its behavior so the final error is returned along with the final data, instead of in the first call after the final data.

func HalfReader ¶ Uses

func HalfReader(r io.Reader) io.Reader

HalfReader returns a Reader that implements Read by reading half as many requested bytes from r.

func NewReadLogger ¶ Uses

func NewReadLogger(prefix string, r io.Reader) io.Reader

NewReadLogger returns a reader that behaves like r except that it logs (using log.Print) each read to standard error, printing the prefix and the hexadecimal data read.

func NewWriteLogger ¶ Uses

func NewWriteLogger(prefix string, w io.Writer) io.Writer

NewWriteLogger returns a writer that behaves like w except that it logs (using log.Printf) each write to standard error, printing the prefix and the hexadecimal data written.

func OneByteReader ¶ Uses

func OneByteReader(r io.Reader) io.Reader

OneByteReader returns a Reader that implements each non-empty Read by reading one byte from r.

func TimeoutReader ¶ Uses

func TimeoutReader(r io.Reader) io.Reader

TimeoutReader returns ErrTimeout on the second read with no data. Subsequent calls to read succeed.

func TruncateWriter ¶ Uses

func TruncateWriter(w io.Writer, n int64) io.Writer

TruncateWriter returns a Writer that writes to w but stops silently after n bytes.