traefik/integration/keepalive_test.go

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package integration
import (
"math"
"net"
"net/http"
"net/http/httptest"
"os"
"time"
2019-08-03 01:58:23 +00:00
"github.com/containous/traefik/v2/integration/try"
"github.com/go-check/check"
checker "github.com/vdemeester/shakers"
)
type KeepAliveSuite struct {
BaseSuite
}
type KeepAliveConfig struct {
KeepAliveServer string
IdleConnTimeout string
}
type connStateChangeEvent struct {
key string
state http.ConnState
}
func (s *KeepAliveSuite) TestShouldRespectConfiguredBackendHttpKeepAliveTime(c *check.C) {
idleTimeout := time.Duration(75) * time.Millisecond
connStateChanges := make(chan connStateChangeEvent)
noMoreRequests := make(chan bool, 1)
completed := make(chan bool, 1)
// keep track of HTTP connections and their status changes and measure their idle period
go func() {
connCount := 0
idlePeriodStartMap := make(map[string]time.Time)
idlePeriodLengthMap := make(map[string]time.Duration)
maxWaitDuration := 5 * time.Second
maxWaitTimeExceeded := time.After(maxWaitDuration)
moreRequestsExpected := true
// Ensure that all idle HTTP connections are closed before verification phase
for moreRequestsExpected || len(idlePeriodLengthMap) < connCount {
select {
case event := <-connStateChanges:
switch event.state {
case http.StateNew:
connCount++
case http.StateIdle:
idlePeriodStartMap[event.key] = time.Now()
case http.StateClosed:
idlePeriodLengthMap[event.key] = time.Since(idlePeriodStartMap[event.key])
}
case <-noMoreRequests:
moreRequestsExpected = false
case <-maxWaitTimeExceeded:
c.Logf("timeout waiting for all connections to close, waited for %v, configured idle timeout was %v", maxWaitDuration, idleTimeout)
c.Fail()
close(completed)
return
}
}
c.Check(connCount, checker.Equals, 1)
for _, idlePeriod := range idlePeriodLengthMap {
// Our method of measuring the actual idle period is not precise, so allow some sub-ms deviation
c.Check(math.Round(idlePeriod.Seconds()), checker.LessOrEqualThan, idleTimeout.Seconds())
}
close(completed)
}()
server := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
}))
server.Config.ConnState = func(conn net.Conn, state http.ConnState) {
connStateChanges <- connStateChangeEvent{key: conn.RemoteAddr().String(), state: state}
}
server.Start()
defer server.Close()
config := KeepAliveConfig{KeepAliveServer: server.URL, IdleConnTimeout: idleTimeout.String()}
file := s.adaptFile(c, "fixtures/timeout/keepalive.toml", config)
defer os.Remove(file)
cmd, display := s.traefikCmd(withConfigFile(file))
defer display(c)
err := cmd.Start()
c.Check(err, checker.IsNil)
defer cmd.Process.Kill()
err = try.GetRequest("http://127.0.0.1:8000/keepalive", time.Duration(1)*time.Second, try.StatusCodeIs(200))
c.Check(err, checker.IsNil)
close(noMoreRequests)
<-completed
}