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handlers.go
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/
handlers.go
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// Copyright 2017 Fabian Kohn. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package profiler defines and manages the basic profiling commands and the
// web frontend.
package profiler
import (
"bufio"
"bytes"
"fmt"
"html/template"
"io"
"log"
"net/http"
"os"
"runtime"
"runtime/pprof"
"runtime/trace"
"strconv"
"strings"
"time"
"github.com/fako1024/profiler/internal/fetch"
"github.com/fako1024/profiler/internal/profile"
"github.com/fako1024/profiler/internal/report"
"github.com/fako1024/profiler/internal/symbolz"
)
// Handler returns an HTTP handler that serves the named profile.
func Handler(name string) http.Handler {
return handler(name)
}
type handler string
func (name handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
debug, _ := strconv.Atoi(r.FormValue("debug"))
p := pprof.Lookup(string(name))
if p == nil {
w.WriteHeader(404)
fmt.Fprintf(w, "Unknown profile: %s\n", name)
return
}
gc, _ := strconv.Atoi(r.FormValue("gc"))
if name == "heap" && gc > 0 {
runtime.GC()
}
p.WriteTo(w, debug)
return
}
// Index responds with the pprof-formatted profile named by the request.
// For example, "/heap" serves the "heap" profile.
// Index responds to a request for "/" with an HTML page
// listing the available profiles.
func (p *Profiler) Index(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
handler(strings.TrimPrefix(r.URL.Path, "/")).ServeHTTP(w, r)
return
}
profiles := pprof.Profiles()
indexTmpl := template.Must(template.New("index").Parse(p.htmlTemplate))
if err := indexTmpl.Execute(w, profiles); err != nil {
log.Print(err)
}
}
// Cmdline responds with the running program's
// command line, with arguments separated by NUL bytes.
// The package initialization registers it as /cmdline.
func (p *Profiler) Cmdline(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
fmt.Fprintf(w, strings.Join(os.Args, "\x00"))
}
// Profile responds with the pprof-formatted cpu profile.
// The package initialization registers it as /profile.
func (p *Profiler) Profile(w http.ResponseWriter, r *http.Request) {
sec, _ := strconv.ParseInt(r.FormValue("seconds"), 10, 64)
if sec == 0 {
sec = 30
}
binary, _ := strconv.ParseBool(r.FormValue("binary"))
cum, _ := strconv.ParseBool(r.FormValue("cum"))
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
var buf bytes.Buffer
if err := pprof.StartCPUProfile(&buf); err != nil {
// StartCPUProfile failed, so no writes yet.
// Enforce header to text content and send error code.
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Could not enable CPU profiling: %s\n", err)
return
}
sleep(w, time.Duration(sec)*time.Second)
pprof.StopCPUProfile()
// If plain text profile was requested, process the collected profile data,
// otherwise send the binary data in the buffer
if binary {
// Set binary content type and send the data
w.Header().Set("Content-Type", "application/octet-stream")
w.Write(buf.Bytes())
} else {
// Parse profile
prof, err := profile.Parse(&buf)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Failed to parse profile: %s\n", err)
return
}
// Symbolize profile using symbol lookup call to self
if err = symbolz.Symbolize("http://"+r.Host+"/symbol", fetch.PostURL, prof); err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Failed to symbolize profile: %s\n", err)
}
// Create a new profile report
rpt := report.NewDefault(prof, report.Options{
OutputFormat: report.Text,
CumSort: cum,
PrintAddresses: true,
})
// Genrate the report, reusing the existing buffer
buf.Reset()
report.Generate(&buf, rpt, nil)
// Send the buffer contents
w.Write(buf.Bytes())
}
}
// Trace responds with the execution trace in binary form.
// Tracing lasts for duration specified in seconds GET parameter, or for 1 second if not specified.
// The package initialization registers it as /trace.
func (p *Profiler) Trace(w http.ResponseWriter, r *http.Request) {
sec, err := strconv.ParseFloat(r.FormValue("seconds"), 64)
if sec <= 0 || err != nil {
sec = 1
}
// Set Content Type assuming trace.Start will work,
// because if it does it starts writing.
w.Header().Set("Content-Type", "application/octet-stream")
if err := trace.Start(w); err != nil {
// trace.Start failed, so no writes yet.
// Can change header back to text content and send error code.
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Could not enable tracing: %s\n", err)
return
}
sleep(w, time.Duration(sec*float64(time.Second)))
trace.Stop()
}
// Symbol looks up the program counters listed in the request,
// responding with a table mapping program counters to function names.
// The package initialization registers it as /symbol.
func (p *Profiler) Symbol(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
// We have to read the whole POST body before
// writing any output. Buffer the output here.
var buf bytes.Buffer
// We don't know how many symbols we have, but we
// do have symbol information. Pprof only cares whether
// this number is 0 (no symbols available) or > 0.
fmt.Fprintf(&buf, "num_symbols: 1\n")
var b *bufio.Reader
if r.Method == "POST" {
b = bufio.NewReader(r.Body)
} else {
b = bufio.NewReader(strings.NewReader(r.URL.RawQuery))
}
for {
word, err := b.ReadSlice('+')
if err == nil {
word = word[0 : len(word)-1] // trim +
}
pc, _ := strconv.ParseUint(string(word), 0, 64)
if pc != 0 {
f := runtime.FuncForPC(uintptr(pc))
if f != nil {
fmt.Fprintf(&buf, "%#x %s\n", pc, f.Name())
}
}
// Wait until here to check for err; the last
// symbol will have an err because it doesn't end in +.
if err != nil {
if err != io.EOF {
fmt.Fprintf(&buf, "reading request: %v\n", err)
}
break
}
}
w.Write(buf.Bytes())
}
func sleep(w http.ResponseWriter, d time.Duration) {
var clientGone <-chan bool
if cn, ok := w.(http.CloseNotifier); ok {
clientGone = cn.CloseNotify()
}
select {
case <-time.After(d):
case <-clientGone:
}
}