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package main
import (
"context"
"crypto/rand"
"errors"
"flag"
"fmt"
"log"
"math/big"
"net/http"
"sync"
"time"
"github.com/coder/websocket"
)
var (
chosenCourseID = flag.Int("c", -1, "course ID (-1 for random)")
connections = flag.Int("n", 10000, "number of connections")
)
var (
errUnexpectedStatusCode = errors.New("unexpected status code")
courses = big.NewInt(13)
globalLock sync.RWMutex
)
func w(ctx context.Context, c *websocket.Conn, m string, cid int) error {
log.Printf("%d <- %s", cid, m)
err := c.Write(ctx, websocket.MessageText, []byte(m))
if err != nil {
return fmt.Errorf("error writing to connection: %w", err)
}
return nil
}
func connect(cid int) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
c, r, err := websocket.Dial(ctx, "wss://localhost.runxiyu.org:8080/ws", nil)
if err != nil {
panic(err)
}
defer func() {
err := c.CloseNow()
if err != nil {
panic(err)
}
}()
if r.StatusCode != http.StatusSwitchingProtocols {
panic(errUnexpectedStatusCode)
}
err = w(ctx, c, "HELLO", cid)
if err != nil {
panic(err)
}
go func() {
defer func() {
if r := recover(); r != nil {
cancel()
log.Printf("%d !R %v", cid, r)
}
}()
for {
_, msg, err := c.Read(ctx)
if err != nil {
panic(err)
}
log.Printf("%d -> %s", cid, string(msg))
}
}()
globalLock.RLock()
defer globalLock.RUnlock()
if *chosenCourseID == -1 {
courseID, err := rand.Int(rand.Reader, courses)
if err != nil {
panic(err)
}
err = w(ctx, c, fmt.Sprintf("Y %d", courseID.Int64()+1), cid)
if err != nil {
panic(err)
}
} else {
err = w(ctx, c, fmt.Sprintf("Y %d", *chosenCourseID), cid)
if err != nil {
panic(err)
}
}
var deadlock sync.Mutex
deadlock.Lock()
deadlock.Lock()
}
func main() {
flag.Parse()
globalLock.Lock()
for i := range *connections {
go func() {
defer func() {
if r := recover(); r != nil {
log.Printf("%d !M %v", i, r)
}
}()
connect(i)
}()
time.Sleep(2 * time.Millisecond)
}
for i := range 6 {
time.Sleep(1 * time.Second)
log.Printf("waiting %d before trigger", 5-i)
}
globalLock.Unlock()
var deadlock sync.Mutex
deadlock.Lock()
deadlock.Lock()
}
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