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package rpcserver
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/tendermint/tendermint/libs/log"
)
func TestMaxOpenConnections(t *testing.T) {
const max = 5 // max simultaneous connections
// Start the server.
var open int32
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if n := atomic.AddInt32(&open, 1); n > int32(max) {
t.Errorf("%d open connections, want <= %d", n, max)
}
defer atomic.AddInt32(&open, -1)
time.Sleep(10 * time.Millisecond)
fmt.Fprint(w, "some body")
})
l, err := StartHTTPServer("tcp://127.0.0.1:0", mux, log.TestingLogger(), Config{MaxOpenConnections: max})
if err != nil {
t.Fatal(err)
}
defer l.Close()
// Make N GET calls to the server.
attempts := max * 2
var wg sync.WaitGroup
var failed int32
for i := 0; i < attempts; i++ {
wg.Add(1)
go func() {
defer wg.Done()
c := http.Client{Timeout: 3 * time.Second}
r, err := c.Get("http://" + l.Addr().String())
if err != nil {
t.Log(err)
atomic.AddInt32(&failed, 1)
return
}
defer r.Body.Close()
io.Copy(ioutil.Discard, r.Body)
}()
}
wg.Wait()
// We expect some Gets to fail as the server's accept queue is filled,
// but most should succeed.
if int(failed) >= attempts/2 {
t.Errorf("%d requests failed within %d attempts", failed, attempts)
}
}