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package main
import (
"os"
"runtime/pprof"
"runtime/trace"
"time"
"github.com/rfjakob/gocryptfs/v2/internal/exitcodes"
"github.com/rfjakob/gocryptfs/v2/internal/tlog"
)
// setupCpuprofile is called to handle a non-empty "-cpuprofile" cli argument
func setupCpuprofile(cpuprofileArg string) func() {
tlog.Info.Printf("Writing CPU profile to %s", cpuprofileArg)
f, err := os.Create(cpuprofileArg)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(exitcodes.Profiler)
}
err = pprof.StartCPUProfile(f)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(exitcodes.Profiler)
}
return func() {
pprof.StopCPUProfile()
}
}
// setupTrace is called to handle a non-empty "-memprofile" cli argument
func setupMemprofile(memprofileArg string) func() {
tlog.Info.Printf("Will write memory profile to %q", memprofileArg)
f, err := os.Create(memprofileArg)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(exitcodes.Profiler)
}
exiting := false
// Write the memory profile to disk every 60 seconds to get the in-use
// memory stats.
go func() {
for {
time.Sleep(60 * time.Second)
if exiting {
return
}
_, err = f.Seek(0, 0)
if err != nil {
tlog.Warn.Printf("memprofile: Seek failed: %v", err)
return
}
err = f.Truncate(0)
if err != nil {
tlog.Warn.Printf("memprofile: Truncate failed: %v", err)
return
}
err = pprof.WriteHeapProfile(f)
if err == nil {
tlog.Info.Printf("memprofile: periodic write to %q succeeded",
memprofileArg)
} else {
tlog.Warn.Printf("memprofile: periodic WriteHeapProfile failed: %v", err)
return
}
}
}()
// Final write on exit.
return func() {
exiting = true
err = pprof.WriteHeapProfile(f)
if err != nil {
tlog.Warn.Printf("memprofile: on-exit WriteHeapProfile failed: %v", err)
}
f.Close()
}
}
// setupTrace is called to handle a non-empty "-trace" cli argument
func setupTrace(traceArg string) func() {
tlog.Info.Printf("Writing execution trace to %s", traceArg)
f, err := os.Create(traceArg)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(exitcodes.Profiler)
}
err = trace.Start(f)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(exitcodes.Profiler)
}
return func() {
trace.Stop()
}
}
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