// Test state transitions from new->active->-idle->closed using an actual
// network connection and make sure the waitgroup count is correct at the end.
func TestStateTransitionActiveIdleClosed(t *testing.T) {
var (
listener net.Listener
exitchan chan error
)
keyFile, err1 := helpers.NewTempFile(helpers.Key)
certFile, err2 := helpers.NewTempFile(helpers.Cert)
defer keyFile.Unlink()
defer certFile.Unlink()
if err1 != nil || err2 != nil {
t.Fatal("Failed to create temporary files", err1, err2)
}
for _, withTLS := range []bool{false, true} {
server := NewServer()
wg := helpers.NewWaitGroup()
statechanged := make(chan http.ConnState)
server.wg = wg
if withTLS {
listener, exitchan = startTLSServer(t, server, certFile.Name(), keyFile.Name(), statechanged)
} else {
listener, exitchan = startServer(t, server, statechanged)
}
client := newClient(listener.Addr(), withTLS)
client.Run()
// wait for client to connect, but don't let it send the request
if err := <-client.connected; err != nil {
t.Fatal("Client failed to connect to server", err)
}
client.sendrequest <- true
waitForState(t, statechanged, http.StateActive, "Client failed to reach active state")
rr := <-client.response
if rr.err != nil {
t.Fatalf("tls=%t unexpected error from client %s", withTLS, rr.err)
}
waitForState(t, statechanged, http.StateIdle, "Client failed to reach idle state")
// client is now in an idle state
close(client.sendrequest)
<-client.closed
waitForState(t, statechanged, http.StateClosed, "Client failed to reach closed state")
server.Close()
waiting := <-wg.WaitCalled
if waiting != 0 {
t.Errorf("Waitcount should be zero, got %d", waiting)
}
if err := <-exitchan; err != nil {
t.Error("Unexpected error during shutdown", err)
}
}
}
// Tests that the server allows in-flight requests to complete
// before shutting down.
func TestGracefulness(t *testing.T) {
server := NewServer()
wg := helpers.NewWaitGroup()
server.wg = wg
statechanged := make(chan http.ConnState)
listener, exitchan := startServer(t, server, statechanged)
client := newClient(listener.Addr(), false)
client.Run()
// wait for client to connect, but don't let it send the request yet
if err := <-client.connected; err != nil {
t.Fatal("Client failed to connect to server", err)
}
// Even though the client is connected, the server ConnState handler may
// not know about that yet. So wait until it is called.
waitForState(t, statechanged, http.StateNew, "Request not received")
server.Close()
waiting := <-wg.WaitCalled
if waiting < 1 {
t.Errorf("Expected the waitgroup to equal 1 at shutdown; actually %d", waiting)
}
// allow the client to finish sending the request and make sure the server exits after
// (client will be in connected but idle state at that point)
client.sendrequest <- true
close(client.sendrequest)
if err := <-exitchan; err != nil {
t.Error("Unexpected error during shutdown", err)
}
}
// Test that a request moving from active->idle->active using an actual
// network connection still results in a corect shutdown
func TestStateTransitionActiveIdleActive(t *testing.T) {
server := NewServer()
wg := helpers.NewWaitGroup()
statechanged := make(chan http.ConnState)
server.wg = wg
listener, exitchan := startServer(t, server, statechanged)
client := newClient(listener.Addr(), false)
client.Run()
// wait for client to connect, but don't let it send the request
if err := <-client.connected; err != nil {
t.Fatal("Client failed to connect to server", err)
}
for i := 0; i < 2; i++ {
client.sendrequest <- true
waitForState(t, statechanged, http.StateActive, "Client failed to reach active state")
<-client.response
waitForState(t, statechanged, http.StateIdle, "Client failed to reach idle state")
}
// client is now in an idle state
server.Close()
waiting := <-wg.WaitCalled
if waiting != 0 {
t.Errorf("Waitcount should be zero, got %d", waiting)
}
if err := <-exitchan; err != nil {
t.Error("Unexpected error during shutdown", err)
}
}
// Test that a connection is closed upon reaching an idle state if and only if the server
// is shutting down.
func TestCloseOnIdle(t *testing.T) {
server := newServer()
wg := helpers.NewWaitGroup()
server.wg = wg
fl := helpers.NewListener()
runner := func() error {
return server.Serve(fl)
}
startGenericServer(t, server, nil, runner)
// Change to idle state while server is not closing; Close should not be called
conn := &helpers.Conn{}
server.ConnState(conn, http.StateIdle)
if conn.CloseCalled {
t.Error("Close was called unexpected")
}
server.Close()
// wait until the server calls Close() on the listener
// by that point the atomic closing variable will have been updated, avoiding a race.
<-fl.CloseCalled
conn = &helpers.Conn{}
server.ConnState(conn, http.StateIdle)
if !conn.CloseCalled {
t.Error("Close was not called")
}
}
// Tests that the server allows in-flight requests to complete
// before shutting down.
func TestGracefulness(t *testing.T) {
server := newServer()
wg := helpers.NewWaitGroup()
server.wg = wg
statechanged := make(chan http.ConnState)
listener, exitchan := startServer(t, server, statechanged)
client := newClient(listener.Addr(), false)
client.Run()
// wait for client to connect, but don't let it send the request yet
if err := <-client.connected; err != nil {
t.Fatal("Client failed to connect to server", err)
}
// avoid a race between the client connection and the server accept
if state := <-statechanged; state != http.StateNew {
t.Fatal("Unexpected state", state)
}
server.Close()
waiting := <-wg.WaitCalled
if waiting < 1 {
t.Errorf("Expected the waitgroup to equal 1 at shutdown; actually %d", waiting)
}
// allow the client to finish sending the request and make sure the server exits after
// (client will be in connected but idle state at that point)
client.sendrequest <- true
close(client.sendrequest)
if err := <-exitchan; err != nil {
t.Error("Unexpected error during shutdown", err)
}
}
// Tests that the server begins to shut down when told to and does not accept
// new requests once shutdown has begun
func TestShutdown(t *testing.T) {
server := newServer()
wg := helpers.NewWaitGroup()
server.wg = wg
statechanged := make(chan http.ConnState)
listener, exitchan := startServer(t, server, statechanged)
client1 := newClient(listener.Addr(), false)
client1.Run()
// wait for client1 to connect
if err := <-client1.connected; err != nil {
t.Fatal("Client failed to connect to server", err)
}
// avoid a race between the client connection and the server accept
if state := <-statechanged; state != http.StateNew {
t.Fatal("Unexpected state", state)
}
// start the shutdown; once it hits waitgroup.Wait()
// the listener should of been closed, though client1 is still connected
if server.Close() != true {
t.Fatal("first call to Close returned false")
}
if server.Close() != false {
t.Fatal("second call to Close returned true")
}
waiting := <-wg.WaitCalled
if waiting != 1 {
t.Errorf("Waitcount should be one, got %d", waiting)
}
// should get connection refused at this point
client2 := newClient(listener.Addr(), false)
client2.Run()
if err := <-client2.connected; err == nil {
t.Fatal("client2 connected when it should of received connection refused")
}
// let client1 finish so the server can exit
close(client1.sendrequest) // don't bother sending an actual request
<-exitchan
}
func testStateTransition(t *testing.T, test transitionTest) {
server := newServer()
wg := helpers.NewWaitGroup()
server.wg = wg
startServer(t, server, nil)
conn := &helpers.Conn{}
for _, newState := range test.states {
server.ConnState(conn, newState)
}
server.Close()
waiting := <-wg.WaitCalled
if waiting != test.expectedWgCount {
names := make([]string, len(test.states))
for i, s := range test.states {
names[i] = s.String()
}
transitions := strings.Join(names, " -> ")
t.Errorf("%s - Waitcount should be %d, got %d", transitions, test.expectedWgCount, waiting)
}
}