mirror of
https://github.com/cwinfo/matterbridge.git
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170 lines
2.7 KiB
Go
170 lines
2.7 KiB
Go
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// Copyright 2022 The Libc Authors. 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 libc // import "modernc.org/libc"
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import (
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"bytes"
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"fmt"
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"math"
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"runtime/debug"
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"sort"
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"strings"
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"sync"
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"sync/atomic"
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"github.com/dustin/go-humanize"
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)
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type PerfCounter struct {
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a []int32
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labels []string
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enabled bool
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}
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func NewPerfCounter(labels []string) *PerfCounter {
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return &PerfCounter{
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a: make([]int32, len(labels)),
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labels: labels,
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enabled: true,
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}
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}
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func (c *PerfCounter) Disable() { c.enabled = false }
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func (c *PerfCounter) Enable() { c.enabled = true }
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func (c *PerfCounter) Clear() {
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for i := range c.a {
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c.a[i] = 0
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}
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}
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func (c *PerfCounter) Inc(n int) {
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if c.enabled {
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atomic.AddInt32(&c.a[n], 1)
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}
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}
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func (c *PerfCounter) IncN(n, m int) {
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if c.enabled {
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atomic.AddInt32(&c.a[n], int32(m))
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}
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}
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func (c *PerfCounter) String() string {
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sv := c.enabled
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defer func() { c.enabled = sv }()
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c.enabled = false
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var a []string
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for i, v := range c.a {
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if v != 0 {
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a = append(a, fmt.Sprintf("%q: %s", c.labels[i], h(v)))
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}
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}
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return fmt.Sprint(a)
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}
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func h(v interface{}) string {
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switch x := v.(type) {
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case int:
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return humanize.Comma(int64(x))
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case int32:
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return humanize.Comma(int64(x))
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case int64:
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return humanize.Comma(x)
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case uint32:
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return humanize.Comma(int64(x))
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case uint64:
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if x <= math.MaxInt64 {
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return humanize.Comma(int64(x))
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}
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return "-" + humanize.Comma(-int64(x))
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}
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return fmt.Sprint(v)
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}
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type StackCapture struct {
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sync.Mutex
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m map[string]int
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depth int
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enabled bool
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}
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func NewStackCapture(depth int) *StackCapture {
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return &StackCapture{
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m: map[string]int{},
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depth: depth,
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enabled: true,
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}
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}
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func (c *StackCapture) Disable() { c.enabled = false }
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func (c *StackCapture) Enable() { c.enabled = true }
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func (c *StackCapture) Clear() {
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c.Lock()
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defer c.Unlock()
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c.m = map[string]int{}
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}
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var (
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stackCapturePrefix = []byte("\n\t")
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)
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func (c *StackCapture) Record() {
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if !c.enabled {
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return
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}
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b := debug.Stack()
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var s strings.Builder
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out:
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for i := 0; len(b) > 0 && i < c.depth+2; i++ {
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l := bytes.Index(b, stackCapturePrefix)
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if l < 0 {
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break out
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}
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b = b[l+len(stackCapturePrefix):]
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h := bytes.IndexByte(b, '\n')
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if h < 0 {
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h = len(b)
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}
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if i > 1 {
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fmt.Fprintf(&s, "\n\t%s", b[:h])
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}
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b = b[h:]
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}
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c.Lock()
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defer c.Unlock()
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c.m[s.String()]++
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}
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func (c *StackCapture) String() string {
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c.Lock()
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defer c.Unlock()
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var b strings.Builder
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var a []string
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for k := range c.m {
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a = append(a, k)
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}
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sort.Slice(a, func(i, j int) bool { return c.m[a[i]] < c.m[a[j]] })
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for _, k := range a {
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fmt.Fprintf(&b, "%d%s\n", c.m[k], k)
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}
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return b.String()
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}
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