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