/
main.go
235 lines (205 loc) · 5.34 KB
/
main.go
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package main
import (
"flag"
"github.com/vys/go-humanize"
"io"
"log"
"net"
"os"
"os/signal"
"runtime"
"runtime/pprof"
"strconv"
"syscall"
"time"
)
type Server struct {
proto string
addr string
handler func(c *net.TCPConn) error
}
type Client struct {
proto string
addr string
handler func(c *net.TCPConn) error
concurrency int
size int
nflight int
reqres bool
saddr string
}
func (s *Server) ListenAndGo() error {
tcpaddr, err := net.ResolveTCPAddr(s.proto, s.addr)
if err != nil {
log.Println("Failed to resolve ", s.addr, " with error: ", err)
return err
}
ln, err := net.ListenTCP(s.proto, tcpaddr)
if err != nil {
log.Println("Failed to listen for tcp connections on address ", s.addr, " with error: ", err)
return err
}
for {
conn, err := ln.AcceptTCP()
if err != nil {
log.Println("Failed to accept connection ", conn, " with error ", err)
continue
}
log.Println("Client ", conn.RemoteAddr(), " connected")
go s.handler(conn)
}
return nil
}
func (c *Client) NewConnection() (*net.TCPConn, error) {
srcTcpAddr, err := net.ResolveTCPAddr(c.proto, c.saddr)
if err != nil {
log.Println("Failed to resolve ", c.saddr)
return nil, err
}
dstTcpAddr, err := net.ResolveTCPAddr(c.proto, c.addr)
if err != nil {
log.Println("Failed to resolve ", c.addr)
return nil, err
}
return net.DialTCP(c.proto, srcTcpAddr, dstTcpAddr)
}
func (c *Client) ConnectAndGo() error {
conns := make([]*net.TCPConn, c.concurrency)
for i := 0; i < c.concurrency; i++ {
conn, err := c.NewConnection()
if err != nil {
log.Println("Failed to connect to tcp server on address ", c.addr, " from source address: ", c.saddr, " Error: ", err)
conn.Close()
return err
}
log.Println("Client ", conn.LocalAddr(), " connected to ", conn.RemoteAddr())
conns[i] = conn
}
for i := 0; i < c.concurrency; i++ {
go c.handler(conns[i])
}
return nil
}
func TCPConnRead(c *net.TCPConn) error {
c.SetReadBuffer(*packetsize)
for {
_, err := c.Read(b)
if err != nil {
if err == io.EOF {
log.Println("Client ", c.RemoteAddr(), " disconnected")
c.Close()
return nil
} else {
log.Println("Failed reading bytes from conn: ", c, " with error ", err)
c.Close()
return err
}
}
}
return nil
}
var b []byte
func TCPConnWrite(c *net.TCPConn) error {
c.SetWriteBuffer(*packetsize)
for {
_, err := c.Write(b)
if err != nil {
if err == io.EOF {
log.Println("Client ", c.RemoteAddr(), " disconnected")
c.Close()
return nil
} else {
log.Println("Failed writing bytes to conn: ", c, " with error ", err)
c.Close()
return err
}
}
}
return nil
}
var packetsize *int
func main() {
host := flag.String("host", "127.0.0.1", "Host IP address")
port := flag.String("port", "12345", "Port")
shost := flag.String("shost", "127.0.0.1", "Host IP address")
sport := flag.String("sport", "0", "Port")
listen := flag.Bool("listen", false, "Listen")
packetsize = flag.Int("size", 1500, "Size of packets to send")
nconn := flag.Int("nconn", 254, "Number of concurrent connections")
reqres := flag.Bool("reqres", false, "Request/Response protocol")
nflight := flag.Int("nflight", 1024, "Number of requests in flight before waiting for response")
profile := flag.String("profile", "", "write profile to file with following prefix")
flag.Parse()
if *profile != "" {
go doprofile(*profile)
}
if flag.NArg() != 0 {
log.Println("Usage:")
flag.PrintDefaults()
return
}
b = make([]byte, *packetsize)
go GoRuntimeStats()
if *listen {
s := &Server{proto: "tcp", addr: net.JoinHostPort(*host, *port), handler: TCPConnWrite}
s.ListenAndGo()
} else {
c := &Client{proto: "tcp", addr: net.JoinHostPort(*host, *port), handler: TCPConnRead,
size: *packetsize, concurrency: *nconn, nflight: *nflight, reqres: *reqres,
saddr: net.JoinHostPort(*shost, *sport)}
c.ConnectAndGo()
SigIntHandler()
}
log.Println("Finished execution!")
}
func SigIntHandler() {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT)
<-ch
log.Println("CTRL-C; exiting")
os.Exit(0)
}
func GoRuntimeStats() {
m := new(runtime.MemStats)
for {
time.Sleep(5 * time.Second)
log.Println("# goroutines: ", runtime.NumGoroutine())
runtime.ReadMemStats(m)
log.Println("Memory Acquired: ", humanize.Bytes(m.Sys))
log.Println("Memory Used : ", humanize.Bytes(m.Alloc))
log.Println("# malloc : ", m.Mallocs)
log.Println("# free : ", m.Frees)
log.Println("GC enabled : ", m.EnableGC)
log.Println("# GC : ", m.NumGC)
log.Println("Last GC time : ", m.LastGC)
log.Println("Next GC : ", humanize.Bytes(m.NextGC))
//runtime.GC()
}
}
func doprofile(fn string) {
var err error
var fc, fh, ft *os.File
for i := 1; i > 0; i++ {
fc, err = os.Create(fn + "-cpu-" + strconv.Itoa(i) + ".prof")
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(fc)
time.Sleep(300 * time.Second)
pprof.StopCPUProfile()
fc.Close()
fh, err = os.Create(fn + "-heap-" + strconv.Itoa(i) + ".prof")
if err != nil {
log.Fatal(err)
}
pprof.WriteHeapProfile(fh)
fh.Close()
ft, err = os.Create(fn + "-threadcreate-" + strconv.Itoa(i) + ".prof")
if err != nil {
log.Fatal(err)
}
pprof.Lookup("threadcreate").WriteTo(ft, 0)
ft.Close()
log.Println("Created CPU, heap and threadcreate profile of 300 seconds")
}
}