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|
package envpprof
import (
"expvar"
"fmt"
"io/ioutil"
"net"
"net/http"
_ "net/http/pprof"
"os"
"path/filepath"
"runtime"
"runtime/pprof"
"strings"
"github.com/anacrolix/log"
)
var (
pprofDir = filepath.Join(os.Getenv("HOME"), "pprof")
heap bool
)
func writeHeapProfile() {
os.Mkdir(pprofDir, 0750)
f, err := ioutil.TempFile(pprofDir, "heap")
if err != nil {
log.Printf("error creating heap profile file: %s", err)
return
}
defer f.Close()
pprof.WriteHeapProfile(f)
log.Printf("wrote heap profile to %q", f.Name())
}
// Stop ends CPU profiling, waiting for writes to complete. If heap profiling is enabled, it also
// writes the heap profile to a file. Stop should be deferred from main if cpu or heap profiling
// are to be used through envpprof.
func Stop() {
// Should we check if CPU profiling was initiated through this package?
pprof.StopCPUProfile()
if heap {
// Can or should we do this concurrently with stopping CPU profiling?
writeHeapProfile()
}
}
func startHTTP(value string) {
var l net.Listener
if value == "" {
for port := uint16(6061); port != 6060; port++ {
var err error
l, err = net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
if err == nil {
break
}
}
if l == nil {
log.Print("unable to create envpprof listener for http")
return
}
} else {
var addr string
_, _, err := net.SplitHostPort(value)
if err == nil {
addr = value
} else {
addr = "localhost:" + value
}
l, err = net.Listen("tcp", addr)
if err != nil {
panic(err)
}
}
log.Printf("(pid=%d) envpprof serving http://%s", os.Getpid(), l.Addr())
go func() {
defer l.Close()
log.Printf("error serving http on envpprof listener: %s", http.Serve(l, nil))
}()
}
func init() {
expvar.Publish("numGoroutine", expvar.Func(func() interface{} { return runtime.NumGoroutine() }))
_var := os.Getenv("GOPPROF")
if _var == "" {
return
}
for _, item := range strings.Split(os.Getenv("GOPPROF"), ",") {
equalsPos := strings.IndexByte(item, '=')
var key, value string
if equalsPos < 0 {
key = item
} else {
key = item[:equalsPos]
value = item[equalsPos+1:]
}
switch key {
case "http":
startHTTP(value)
case "cpu":
os.Mkdir(pprofDir, 0750)
f, err := ioutil.TempFile(pprofDir, "cpu")
if err != nil {
log.Printf("error creating cpu pprof file: %s", err)
break
}
err = pprof.StartCPUProfile(f)
if err != nil {
log.Printf("error starting cpu profiling: %s", err)
break
}
log.Printf("cpu profiling to file %q", f.Name())
case "block":
// Taken from Safe Rate at
// https://github.com/DataDog/go-profiler-notes/blob/main/guide/README.md#go-profilers.
runtime.SetBlockProfileRate(10000)
case "heap":
heap = true
case "mutex":
// Taken from Safe Rate at
// https://github.com/DataDog/go-profiler-notes/blob/main/guide/README.md#go-profilers.
runtime.SetMutexProfileFraction(100)
default:
log.Printf("unexpected GOPPROF key %q", key)
}
}
}
|
