Documentation
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Overview ¶
Package readerutil provides and operates on io.Readers.
Package readerutil contains io.Reader types.
Index ¶
- func NewBufferingReaderAt(r io.Reader) io.ReaderAt
- func NewFakeSeeker(r io.Reader, size int64) io.ReadSeeker
- func NewStatsReadSeeker(v *expvar.Int, rs io.ReadSeeker) io.ReadSeeker
- func NewStatsReader(v *expvar.Int, r io.Reader) io.Reader
- func Size(r io.Reader) (size int64, ok bool)
- type CountingReader
- type ReadSeekCloser
- type ReaderAtCloser
- type SizeReaderAt
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func NewBufferingReaderAt ¶
NewBufferingReaderAt returns an io.ReaderAt that reads from r as necessary and keeps a copy of all data read in memory.
func NewFakeSeeker ¶
func NewFakeSeeker(r io.Reader, size int64) io.ReadSeeker
NewFakeSeeker returns a ReadSeeker that can pretend to Seek (based on the provided total size of the reader's content), but any reads will fail if the fake seek position doesn't match reality.
func NewStatsReadSeeker ¶
func NewStatsReadSeeker(v *expvar.Int, rs io.ReadSeeker) io.ReadSeeker
NewStatsReadSeeker returns an io.ReadSeeker that will have the number of bytes read from rs added to v.
func NewStatsReader ¶
NewStatsReader returns an io.Reader that will have the number of bytes read from r added to v.
Example ¶
var (
// r is the io.Reader we'd like to count read from.
r = strings.NewReader("Hello world")
v = expvar.NewInt("read-bytes")
sw = NewStatsReader(v, r)
)
// Read from the wrapped io.Reader, StatReader will count the bytes.
io.Copy(ioutil.Discard, sw)
fmt.Printf("Read %s bytes\n", v.String())
Output: Read 11 bytes
Types ¶
type CountingReader ¶
CountingReader wraps a Reader, incrementing N by the number of bytes read. No locking is performed.
type ReadSeekCloser ¶
A ReadSeekCloser can Read, Seek, and Close.
type SizeReaderAt ¶
A SizeReaderAt is a ReaderAt with a Size method.
An io.SectionReader implements SizeReaderAt.
func NewMultiReaderAt ¶
func NewMultiReaderAt(parts ...SizeReaderAt) SizeReaderAt
NewMultiReaderAt is like io.MultiReader but produces a ReaderAt (and Size), instead of just a reader.
Source Files
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Directories
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| Path | Synopsis |
|---|---|
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package singlereader provides Open and Close operations, reusing existing file descriptors when possible.
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package singlereader provides Open and Close operations, reusing existing file descriptors when possible. |