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
147 lines
2.8 KiB
Go
147 lines
2.8 KiB
Go
// Copyright 2015, Joe Tsai. 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.md file.
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package prefix
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import (
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"bytes"
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"io"
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"strings"
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)
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// For some of the common Readers, we wrap and extend them to satisfy the
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// compress.BufferedReader interface to improve performance.
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type buffer struct {
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*bytes.Buffer
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}
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type bytesReader struct {
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*bytes.Reader
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pos int64
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buf []byte
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arr [512]byte
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}
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type stringReader struct {
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*strings.Reader
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pos int64
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buf []byte
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arr [512]byte
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}
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func (r *buffer) Buffered() int {
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return r.Len()
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}
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func (r *buffer) Peek(n int) ([]byte, error) {
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b := r.Bytes()
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if len(b) < n {
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return b, io.EOF
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}
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return b[:n], nil
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}
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func (r *buffer) Discard(n int) (int, error) {
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b := r.Next(n)
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if len(b) < n {
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return len(b), io.EOF
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}
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return n, nil
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}
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func (r *bytesReader) Buffered() int {
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r.update()
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if r.Len() > len(r.buf) {
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return len(r.buf)
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}
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return r.Len()
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}
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func (r *bytesReader) Peek(n int) ([]byte, error) {
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if n > len(r.arr) {
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return nil, io.ErrShortBuffer
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}
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// Return sub-slice of local buffer if possible.
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r.update()
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if len(r.buf) >= n {
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return r.buf[:n], nil
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}
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// Fill entire local buffer, and return appropriate sub-slice.
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cnt, err := r.ReadAt(r.arr[:], r.pos)
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r.buf = r.arr[:cnt]
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if cnt < n {
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return r.arr[:cnt], err
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}
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return r.arr[:n], nil
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}
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func (r *bytesReader) Discard(n int) (int, error) {
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var err error
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if n > r.Len() {
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n, err = r.Len(), io.EOF
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}
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r.Seek(int64(n), io.SeekCurrent)
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return n, err
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}
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// update reslices the internal buffer to be consistent with the read offset.
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func (r *bytesReader) update() {
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pos, _ := r.Seek(0, io.SeekCurrent)
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if off := pos - r.pos; off >= 0 && off < int64(len(r.buf)) {
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r.buf, r.pos = r.buf[off:], pos
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} else {
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r.buf, r.pos = nil, pos
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}
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}
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func (r *stringReader) Buffered() int {
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r.update()
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if r.Len() > len(r.buf) {
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return len(r.buf)
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}
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return r.Len()
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}
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func (r *stringReader) Peek(n int) ([]byte, error) {
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if n > len(r.arr) {
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return nil, io.ErrShortBuffer
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}
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// Return sub-slice of local buffer if possible.
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r.update()
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if len(r.buf) >= n {
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return r.buf[:n], nil
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}
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// Fill entire local buffer, and return appropriate sub-slice.
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cnt, err := r.ReadAt(r.arr[:], r.pos)
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r.buf = r.arr[:cnt]
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if cnt < n {
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return r.arr[:cnt], err
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}
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return r.arr[:n], nil
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}
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func (r *stringReader) Discard(n int) (int, error) {
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var err error
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if n > r.Len() {
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n, err = r.Len(), io.EOF
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}
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r.Seek(int64(n), io.SeekCurrent)
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return n, err
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}
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// update reslices the internal buffer to be consistent with the read offset.
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func (r *stringReader) update() {
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pos, _ := r.Seek(0, io.SeekCurrent)
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if off := pos - r.pos; off >= 0 && off < int64(len(r.buf)) {
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r.buf, r.pos = r.buf[off:], pos
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} else {
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r.buf, r.pos = nil, pos
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}
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}
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