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gor.go
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gor.go
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// Gor is simple http traffic replication tool written in Go. Its main goal to replay traffic from production servers to staging and dev environments.
// Now you can test your code on real user sessions in an automated and repeatable fashion.
package main
import (
"flag"
"log"
"net/http"
"net/http/httputil"
_ "net/http/pprof"
"os"
"os/signal"
"runtime"
_ "runtime/debug"
"runtime/pprof"
"syscall"
"time"
)
var (
cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
memprofile = flag.String("memprofile", "", "write memory profile to this file")
)
func loggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rb, _ := httputil.DumpRequest(r, false)
log.Println(string(rb))
next.ServeHTTP(w, r)
})
}
func main() {
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU() * 2)
}
args := os.Args[1:]
var plugins *InOutPlugins
if len(args) > 0 && args[0] == "file-server" {
if len(args) != 2 {
log.Fatal("You should specify port and IP (optional) for the file server. Example: `gor file-server :80`")
}
dir, _ := os.Getwd()
Debug(0, "Started example file server for current directory on address ", args[1])
log.Fatal(http.ListenAndServe(args[1], loggingMiddleware(http.FileServer(http.Dir(dir)))))
} else {
flag.Parse()
checkSettings()
plugins = NewPlugins()
}
log.Printf("[PPID %d and PID %d] Version:%s\n", os.Getppid(), os.Getpid(), VERSION)
if len(plugins.Inputs) == 0 || len(plugins.Outputs) == 0 {
log.Fatal("Required at least 1 input and 1 output")
}
if *memprofile != "" {
profileMEM(*memprofile)
}
if *cpuprofile != "" {
profileCPU(*cpuprofile)
}
if Settings.Pprof != "" {
go func() {
log.Println(http.ListenAndServe(Settings.Pprof, nil))
}()
}
closeCh := make(chan int)
emitter := NewEmitter()
go emitter.Start(plugins, Settings.Middleware)
if Settings.ExitAfter > 0 {
log.Printf("Running gor for a duration of %s\n", Settings.ExitAfter)
time.AfterFunc(Settings.ExitAfter, func() {
log.Printf("gor run timeout %s\n", Settings.ExitAfter)
close(closeCh)
})
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
exit := 0
select {
case <-c:
exit = 1
case <-closeCh:
exit = 0
}
emitter.Close()
os.Exit(exit)
}
func profileCPU(cpuprofile string) {
if cpuprofile != "" {
f, err := os.Create(cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
time.AfterFunc(30*time.Second, func() {
pprof.StopCPUProfile()
f.Close()
})
}
}
func profileMEM(memprofile string) {
if memprofile != "" {
f, err := os.Create(memprofile)
if err != nil {
log.Fatal(err)
}
time.AfterFunc(30*time.Second, func() {
pprof.WriteHeapProfile(f)
f.Close()
})
}
}