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85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
/*
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Copyright 2016 The go4 Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package readerutil contains io.Reader types.
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package readerutil // import "go4.org/readerutil"
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import (
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"expvar"
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"io"
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)
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// A SizeReaderAt is a ReaderAt with a Size method.
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//
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// An io.SectionReader implements SizeReaderAt.
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type SizeReaderAt interface {
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Size() int64
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io.ReaderAt
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}
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// A ReadSeekCloser can Read, Seek, and Close.
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type ReadSeekCloser interface {
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io.Reader
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io.Seeker
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io.Closer
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}
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type ReaderAtCloser interface {
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io.ReaderAt
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io.Closer
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}
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// TODO(wathiede): make sure all the stat readers work with code that
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// type asserts ReadFrom/WriteTo.
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type varStatReader struct {
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*expvar.Int
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r io.Reader
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}
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// NewReaderStats returns an io.Reader that will have the number of bytes
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// read from r added to v.
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func NewStatsReader(v *expvar.Int, r io.Reader) io.Reader {
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return &varStatReader{v, r}
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}
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func (v *varStatReader) Read(p []byte) (int, error) {
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n, err := v.r.Read(p)
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v.Int.Add(int64(n))
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return n, err
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}
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type varStatReadSeeker struct {
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*expvar.Int
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rs io.ReadSeeker
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}
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// NewReaderStats returns an io.ReadSeeker that will have the number of bytes
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// read from rs added to v.
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func NewStatsReadSeeker(v *expvar.Int, rs io.ReadSeeker) io.ReadSeeker {
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return &varStatReadSeeker{v, rs}
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}
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func (v *varStatReadSeeker) Read(p []byte) (int, error) {
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n, err := v.rs.Read(p)
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v.Int.Add(int64(n))
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return n, err
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}
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func (v *varStatReadSeeker) Seek(offset int64, whence int) (int64, error) {
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return v.rs.Seek(offset, whence)
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}
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