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6
7 package traceviewer
8
9 import (
10 "bufio"
11 "fmt"
12 "internal/profile"
13 "internal/trace"
14 "net/http"
15 "os"
16 "os/exec"
17 "path/filepath"
18 "runtime"
19 "time"
20 )
21
22 type ProfileFunc func(r *http.Request) ([]ProfileRecord, error)
23
24
25 func SVGProfileHandlerFunc(f ProfileFunc) http.HandlerFunc {
26 return func(w http.ResponseWriter, r *http.Request) {
27 if r.FormValue("raw") != "" {
28 w.Header().Set("Content-Type", "application/octet-stream")
29
30 failf := func(s string, args ...any) {
31 w.Header().Set("Content-Type", "text/plain; charset=utf-8")
32 w.Header().Set("X-Go-Pprof", "1")
33 http.Error(w, fmt.Sprintf(s, args...), http.StatusInternalServerError)
34 }
35 records, err := f(r)
36 if err != nil {
37 failf("failed to get records: %v", err)
38 return
39 }
40 if err := BuildProfile(records).Write(w); err != nil {
41 failf("failed to write profile: %v", err)
42 return
43 }
44 return
45 }
46
47 blockf, err := os.CreateTemp("", "block")
48 if err != nil {
49 http.Error(w, fmt.Sprintf("failed to create temp file: %v", err), http.StatusInternalServerError)
50 return
51 }
52 defer func() {
53 blockf.Close()
54 os.Remove(blockf.Name())
55 }()
56 records, err := f(r)
57 if err != nil {
58 http.Error(w, fmt.Sprintf("failed to generate profile: %v", err), http.StatusInternalServerError)
59 }
60 blockb := bufio.NewWriter(blockf)
61 if err := BuildProfile(records).Write(blockb); err != nil {
62 http.Error(w, fmt.Sprintf("failed to write profile: %v", err), http.StatusInternalServerError)
63 return
64 }
65 if err := blockb.Flush(); err != nil {
66 http.Error(w, fmt.Sprintf("failed to flush temp file: %v", err), http.StatusInternalServerError)
67 return
68 }
69 if err := blockf.Close(); err != nil {
70 http.Error(w, fmt.Sprintf("failed to close temp file: %v", err), http.StatusInternalServerError)
71 return
72 }
73 svgFilename := blockf.Name() + ".svg"
74 if output, err := exec.Command(goCmd(), "tool", "pprof", "-svg", "-output", svgFilename, blockf.Name()).CombinedOutput(); err != nil {
75 http.Error(w, fmt.Sprintf("failed to execute go tool pprof: %v\n%s", err, output), http.StatusInternalServerError)
76 return
77 }
78 defer os.Remove(svgFilename)
79 w.Header().Set("Content-Type", "image/svg+xml")
80 http.ServeFile(w, r, svgFilename)
81 }
82 }
83
84 type ProfileRecord struct {
85 Stack []*trace.Frame
86 Count uint64
87 Time time.Duration
88 }
89
90 func BuildProfile(prof []ProfileRecord) *profile.Profile {
91 p := &profile.Profile{
92 PeriodType: &profile.ValueType{Type: "trace", Unit: "count"},
93 Period: 1,
94 SampleType: []*profile.ValueType{
95 {Type: "contentions", Unit: "count"},
96 {Type: "delay", Unit: "nanoseconds"},
97 },
98 }
99 locs := make(map[uint64]*profile.Location)
100 funcs := make(map[string]*profile.Function)
101 for _, rec := range prof {
102 var sloc []*profile.Location
103 for _, frame := range rec.Stack {
104 loc := locs[frame.PC]
105 if loc == nil {
106 fn := funcs[frame.File+frame.Fn]
107 if fn == nil {
108 fn = &profile.Function{
109 ID: uint64(len(p.Function) + 1),
110 Name: frame.Fn,
111 SystemName: frame.Fn,
112 Filename: frame.File,
113 }
114 p.Function = append(p.Function, fn)
115 funcs[frame.File+frame.Fn] = fn
116 }
117 loc = &profile.Location{
118 ID: uint64(len(p.Location) + 1),
119 Address: frame.PC,
120 Line: []profile.Line{
121 {
122 Function: fn,
123 Line: int64(frame.Line),
124 },
125 },
126 }
127 p.Location = append(p.Location, loc)
128 locs[frame.PC] = loc
129 }
130 sloc = append(sloc, loc)
131 }
132 p.Sample = append(p.Sample, &profile.Sample{
133 Value: []int64{int64(rec.Count), int64(rec.Time)},
134 Location: sloc,
135 })
136 }
137 return p
138 }
139
140 func goCmd() string {
141 var exeSuffix string
142 if runtime.GOOS == "windows" {
143 exeSuffix = ".exe"
144 }
145 path := filepath.Join(runtime.GOROOT(), "bin", "go"+exeSuffix)
146 if _, err := os.Stat(path); err == nil {
147 return path
148 }
149 return "go"
150 }
151
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