ioutils

package
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Published: Sep 22, 2015 License: Apache-2.0 Imports: 11 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func FprintfIfNotEmpty

func FprintfIfNotEmpty(w io.Writer, format, value string) (int, error)

FprintfIfNotEmpty prints the string value if it's not empty

func HashData

func HashData(src io.Reader) (string, error)

HashData returns the sha256 sum of src.

func MultiReadSeeker

func MultiReadSeeker(readers ...io.ReadSeeker) io.ReadSeeker

MultiReadSeeker returns a ReadSeeker that's the logical concatenation of the provided input readseekers. After calling this method the initial position is set to the beginning of the first ReadSeeker. At the end of a ReadSeeker, Read always advances to the beginning of the next ReadSeeker and returns EOF at the end of the last ReadSeeker. Seek can be used over the sum of lengths of all readseekers.

When a MultiReadSeeker is used, no Read and Seek operations should be made on its ReadSeeker components. Also, users should make no assumption on the state of individual readseekers while the MultiReadSeeker is used.

func NewBufReader

func NewBufReader(r io.Reader) io.ReadCloser

NewBufReader returns a new bufReader.

func NewBufReaderWithDrainbufAndBuffer

func NewBufReaderWithDrainbufAndBuffer(r io.Reader, drainBuffer []byte, buffer *bytes.Buffer) io.ReadCloser

NewBufReaderWithDrainbufAndBuffer returns a BufReader with drainBuffer and buffer.

func NewReadCloserWrapper

func NewReadCloserWrapper(r io.Reader, closer func() error) io.ReadCloser

NewReadCloserWrapper returns a new io.ReadCloser.

func NewReaderErrWrapper

func NewReaderErrWrapper(r io.Reader, closer func()) io.Reader

NewReaderErrWrapper returns a new io.Reader.

func NewWriteCloserWrapper

func NewWriteCloserWrapper(r io.Writer, closer func() error) io.WriteCloser

NewWriteCloserWrapper returns a new io.WriteCloser.

func NopWriteCloser

func NopWriteCloser(w io.Writer) io.WriteCloser

NopWriteCloser returns a nopWriteCloser.

Types

type NopFlusher

type NopFlusher struct{}

NopFlusher represents a type which flush opetatin is nop.

func (*NopFlusher) Flush

func (f *NopFlusher) Flush()

Flush is a nop operation.

type NopWriter

type NopWriter struct{}

NopWriter represents a type which write operation is nop.

func (*NopWriter) Write

func (*NopWriter) Write(buf []byte) (int, error)

type OnEOFReader

type OnEOFReader struct {
	Rc io.ReadCloser
	Fn func()
}

OnEOFReader wraps a io.ReadCloser and a function the function will run at the end of file or close the file.

func (*OnEOFReader) Close

func (r *OnEOFReader) Close() error

Close closes the file and run the function.

func (*OnEOFReader) Read

func (r *OnEOFReader) Read(p []byte) (n int, err error)

type WriteCounter

type WriteCounter struct {
	Count  int64
	Writer io.Writer
}

WriteCounter wraps a concrete io.Writer and hold a count of the number of bytes written to the writer during a "session". This can be convenient when write return is masked (e.g., json.Encoder.Encode())

func NewWriteCounter

func NewWriteCounter(w io.Writer) *WriteCounter

NewWriteCounter returns a new WriteCounter.

func (*WriteCounter) Write

func (wc *WriteCounter) Write(p []byte) (count int, err error)

type WriteFlusher

type WriteFlusher struct {
	sync.Mutex
	// contains filtered or unexported fields
}

WriteFlusher wraps the Write and Flush operation.

func NewWriteFlusher

func NewWriteFlusher(w io.Writer) *WriteFlusher

NewWriteFlusher returns a new WriteFlusher.

func (*WriteFlusher) Flush

func (wf *WriteFlusher) Flush()

Flush the stream immediately.

func (*WriteFlusher) Flushed

func (wf *WriteFlusher) Flushed() bool

Flushed returns the state of flushed. If it's flushed, return true, or else it return false.

func (*WriteFlusher) Write

func (wf *WriteFlusher) Write(b []byte) (n int, err error)

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