| commit | c264c87335ff4b3111d43f830dbe37eac1509f2e | [log] [tgz] |
|---|---|---|
| author | Brad Fitzpatrick <bradfitz@golang.org> | Thu Jan 22 14:15:47 2015 -0800 |
| committer | Brad Fitzpatrick <bradfitz@golang.org> | Mon Apr 06 08:53:47 2015 +0000 |
| tree | 72a631779b376ae0ec4b584453d4b07ba897bf02 | |
| parent | c50a8416c851ab6897f9efcd932ac26b5862dcad [diff] |
bytes, strings: add Reader.Size methods As noted on recently on golang-nuts, there's currently no way to know the total size of a strings.Reader or bytes.Reader when using ReadAt on them. Most callers resort to wrapping it in an io.SectionReader to retain that information. The SizeReaderAt abstraction (an io.ReaderAt with a Size() int64 method) has proven useful as a way of expressing a concurrency-safe read-only number of bytes. As one example, see http://talks.golang.org/2013/oscon-dl.slide#49 and the rest of that presentation for its use in dl.google.com. SizeReaderAt is also used in the open source google-api-go-client, and within Google's internal codebase, where it exists in a public package created in 2013 with the package comment: "These may migrate to the standard library after we have enough experience with their feel." I'm still as happy with the SizeReaderAt abstraction and its composabilty as I was in 2013, so I'd like to make these two Readers also be SizeReaderAts. Fixes #9667 Change-Id: Ie6f145ada419dd116280472d8c029f046d5edf70 Reviewed-on: https://go-review.googlesource.com/3199 Reviewed-by: Andrew Gerrand <adg@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Rob Pike <r@golang.org>
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