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util/lineread: add docs to Reader

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In particular, point out how to stop reading
and detect it on the other side.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2020-11-19 11:29:09 -08:00 committed by Josh Bleecher Snyder
parent 1ebbaaaebb
commit b65eee0745
1 changed files with 5 additions and 0 deletions
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5
util/lineread/lineread.go
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@ -22,6 +22,11 @@ func File(name string, fn func(line []byte) error) error {
return Reader(f, fn) return Reader(f, fn)
} }
// Reader calls fn for each line.
// If fn returns an error, Reader stops reading and returns that error.
// Reader may also return errors encountered reading and parsing from r.
// To stop reading early, use a sentinel "stop" error value and ignore
// it when returned from Reader.
func Reader(r io.Reader, fn func(line []byte) error) error { func Reader(r io.Reader, fn func(line []byte) error) error {
bs := bufio.NewScanner(r) bs := bufio.NewScanner(r)
for bs.Scan() { for bs.Scan() {