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May 22, 2020 06:56
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TCP stuck example
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package main | |
import ( | |
"bufio" | |
"io" | |
"log" | |
"net" | |
"sync" | |
"time" | |
) | |
func main() { | |
conn, err := net.Dial("tcp4", "localhost:8888") | |
if err != nil { | |
log.Fatal(err) | |
} | |
var wg sync.WaitGroup | |
go func() { | |
wg.Add(1) | |
defer wg.Done() | |
scope := time.Now().Truncate(time.Second) | |
var avg time.Duration | |
var cnt time.Duration | |
for { | |
startAt := time.Now() | |
startScope := startAt.Truncate(time.Second) | |
_, err := io.WriteString(conn, "Hello!\n") | |
if err != nil { | |
log.Printf("%v (startAt:%v)\n", err, startAt) | |
return | |
} | |
elapsed := time.Now().Sub(startAt) | |
if scope.Equal(startScope) { | |
avg = (cnt*avg + elapsed) / (cnt + 1) | |
cnt++ | |
} else { | |
log.Printf("- %v (%d)\n", avg, cnt) | |
scope = startScope | |
avg = elapsed | |
cnt = 1 | |
} | |
time.Sleep(300 * time.Microsecond) | |
} | |
}() | |
func() { | |
wg.Add(1) | |
defer wg.Done() | |
bufr := bufio.NewReader(conn) | |
for { | |
line, err := bufr.ReadString('\n') | |
if err != nil { | |
log.Println(err) | |
return | |
} | |
log.Printf("received: %s", line) | |
} | |
}() | |
wg.Wait() | |
} |
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2020/05/20 18:14:05 - 21.816µs (2186) | |
2020/05/20 18:14:06 - 21.257µs (2472) | |
2020/05/20 18:14:07 - 21.423µs (2472) | |
2020/05/20 18:14:07 received: Hello! | |
2020/05/20 18:14:08 - 21.736µs (2474) | |
2020/05/20 18:14:09 - 21.771µs (2476) | |
2020/05/20 18:14:10 - 21.649µs (2473) | |
2020/05/20 18:14:10 received: Hello! | |
2020/05/20 18:14:11 - 21.389µs (2448) | |
2020/05/20 18:14:12 - 21.682µs (2473) | |
2020/05/20 18:14:13 - 21.505µs (2482) | |
2020/05/20 18:14:13 received: Hello! | |
2020/05/20 18:14:14 - 21.673µs (2473) | |
2020/05/20 18:14:15 - 21.43µs (2481) | |
2020/05/20 18:14:16 - 21.533µs (2461) | |
2020/05/20 18:14:16 received: Hello! | |
2020/05/20 18:14:17 - 21.527µs (2469) | |
2020/05/20 18:14:18 - 22.538µs (2457) | |
2020/05/20 18:14:19 - 21.3µs (2477) | |
2020/05/20 18:14:19 received: Hello! | |
2020/05/20 18:14:20 - 22.237µs (2468) | |
2020/05/20 18:14:21 - 22.061µs (2469) | |
2020/05/20 18:14:22 - 22.01µs (2463) | |
2020/05/20 18:14:22 received: Hello! | |
2020/05/20 18:14:23 - 21.711µs (2483) | |
2020/05/20 18:14:24 - 22.5µs (2469) | |
2020/05/20 18:14:25 - 21.953µs (2467) | |
2020/05/20 18:14:25 received: Hello! | |
2020/05/20 18:14:26 - 22.39µs (2457) | |
2020/05/20 18:14:27 - 22.322µs (2468) | |
2020/05/20 18:14:28 - 20.327µs (2470) | |
2020/05/20 18:14:28 received: Hello! | |
2020/05/20 18:14:29 - 12.092µs (2524) | |
2020/05/20 18:14:30 - 12.423µs (2515) | |
2020/05/20 18:14:31 - 12.026µs (2520) | |
2020/05/20 18:14:31 received: Hello! | |
2020/05/20 18:14:32 - 12.367µs (2519) | |
2020/05/20 18:14:33 - 12.221µs (2581) | |
2020/05/20 18:14:34 - 12.579µs (2537) | |
2020/05/20 18:14:34 received: Hello! | |
2020/05/20 18:14:35 - 12.464µs (2521) | |
2020/05/20 18:14:36 - 12.734µs (2521) | |
2020/05/20 18:14:37 received: Hello! | |
2020/05/20 18:14:40 received: Hello! | |
2020/05/20 18:14:43 received: Hello! | |
2020/05/20 18:14:46 received: Hello! | |
2020/05/20 18:14:49 received: Hello! | |
2020/05/20 18:14:52 received: Hello! | |
2020/05/20 18:14:55 received: Hello! | |
2020/05/20 18:14:57 read tcp4 127.0.0.1:59345->127.0.0.1:8888: read: connection reset by peer | |
2020/05/20 18:14:57 write tcp4 127.0.0.1:59345->127.0.0.1:8888: write: broken pipe (startAt:2020-05-20 18:14:36.058589 +0900 JST m=+31.945740248) |
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package main | |
import ( | |
"bufio" | |
"io" | |
"log" | |
"net" | |
"time" | |
) | |
func main() { | |
l, err := net.Listen("tcp4", "localhost:8888") | |
if err != nil { | |
log.Fatal(err) | |
} | |
for { | |
c, err := l.Accept() | |
if err != nil { | |
log.Println(err) | |
return | |
} | |
go func(c net.Conn) { | |
bufr := bufio.NewReader(c) | |
for { | |
line, err := bufr.ReadString('\n') | |
if err != nil { | |
log.Println(err) | |
break | |
} | |
time.Sleep(3 * time.Second) # emulate to delay receiving/processing the data | |
_, err = io.WriteString(c, line) | |
if err != nil { | |
log.Println(err) | |
break | |
} | |
} | |
err := c.Close() | |
if err != nil { | |
log.Println(err) | |
} | |
}(c) | |
} | |
} |
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