d2dbb8c963
* cli: initial work on debug; server-status target * debug: add metrics capture target (#7376) * check against DR secondary * debug: add compression * refactor check into preflight func * debug: set short test time on tests, fix exit code bug * debug: use temp dir for output on tests * debug: use mholt/archiver for compression * first pass on adding pprof * use logger for output * refactor polling target capture logic * debug: poll and collect replication status * debug: poll and collect host-info; rename output files and collection refactor * fix comments * add archive test; fix bugs found * rename flag name to singular target * add target output test; scaffold other tests cases * debug/test: add pprof and index file tests * debug/test: add min timing check tests * debug: fix index gen race and collection goroutine race * debug: extend archive tests, handle race between program exit and polling goroutines * update docstring * debug: correctly add to pollingWg * debug: add config target support * debug: don't wait on interrupt shutdown; add file exists unit tests * move pprof bits into its goroutine * debug: skip empty metrics and some pprof file creation if permission denied, add matching unit test * address comments and feedback * Vault debug using run.Group (#7658) * debug: switch to use oklog/run.Group * debug: use context to cancel requests and interrupt rungroups. * debug: trigger the first interval properly * debug: metrics collection should use metrics interval * debug: add missing continue on metrics error * debug: remove the use of buffered chan to trigger first interval * debug: don't shadow BaseCommand's client, properly block on interval capture failures * debug: actually use c.cachedClient everywhere * go mod vendor * debug: run all pprof in goroutines; bump pprof timings in tests to reduce flakiness * debug: update help text
40 lines
852 B
Go
40 lines
852 B
Go
// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzma
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import (
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"errors"
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"io"
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)
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// breader provides the ReadByte function for a Reader. It doesn't read
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// more data from the reader than absolutely necessary.
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type breader struct {
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io.Reader
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// helper slice to save allocations
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p []byte
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}
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// ByteReader converts an io.Reader into an io.ByteReader.
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func ByteReader(r io.Reader) io.ByteReader {
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br, ok := r.(io.ByteReader)
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if !ok {
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return &breader{r, make([]byte, 1)}
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}
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return br
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}
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// ReadByte read byte function.
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func (r *breader) ReadByte() (c byte, err error) {
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n, err := r.Reader.Read(r.p)
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if n < 1 {
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if err == nil {
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err = errors.New("breader.ReadByte: no data")
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}
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return 0, err
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}
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return r.p[0], nil
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}
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