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// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package conntrack_test
import (
"net"
"net/http"
"testing"
"context"
"time"
"github.com/mwitkow/go-conntrack"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/stretchr/testify/suite"
)
func TestListenerTestSuite(t *testing.T) {
suite.Run(t, &ListenerTestSuite{})
}
var (
listenerName = "some_name"
)
type ListenerTestSuite struct {
suite.Suite
serverListener net.Listener
httpServer http.Server
}
func (s *ListenerTestSuite) SetupSuite() {
var err error
s.serverListener, err = net.Listen("tcp", "127.0.0.1:0")
require.NoError(s.T(), err, "must be able to allocate a port for serverListener")
s.serverListener = conntrack.NewListener(s.serverListener, conntrack.TrackWithName(listenerName), conntrack.TrackWithTracing())
s.httpServer = http.Server{
Handler: http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
resp.WriteHeader(http.StatusOK)
}),
}
go func() {
s.httpServer.Serve(s.serverListener)
}()
}
func (s *ListenerTestSuite) TestTrackingMetricsPreregistered() {
// this will create the default listener, check if it is registered
conntrack.NewListener(s.serverListener)
for testId, testCase := range []struct {
metricName string
existingLabels []string
}{
{"net_conntrack_listener_conn_accepted_total", []string{"default"}},
{"net_conntrack_listener_conn_closed_total", []string{"default"}},
{"net_conntrack_listener_conn_accepted_total", []string{listenerName}},
{"net_conntrack_listener_conn_closed_total", []string{listenerName}},
} {
lineCount := len(fetchPrometheusLines(s.T(), testCase.metricName, testCase.existingLabels...))
assert.NotEqual(s.T(), 0, lineCount, "metrics must exist for test case %d", testId)
}
}
func (s *ListenerTestSuite) TestMonitoringNormalConns() {
beforeAccepted := sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_accepted_total", listenerName)
beforeClosed := sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_closed_total", listenerName)
conn, err := (&net.Dialer{}).DialContext(context.TODO(), "tcp", s.serverListener.Addr().String())
require.NoError(s.T(), err, "DialContext should successfully establish a conn here")
assert.Equal(s.T(), beforeAccepted+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_accepted_total", listenerName),
"the accepted conn counter must be incremented after connection was opened")
assert.Equal(s.T(), beforeClosed, sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_closed_total", listenerName),
"the closed conn counter must not be incremented before the connection is closed")
conn.Close()
time.Sleep(5 * time.Millisecond)
assert.Equal(s.T(), beforeClosed+1, sumCountersForMetricAndLabels(s.T(), "net_conntrack_listener_conn_closed_total", listenerName),
"the closed conn counter must be incremented after connection was closed")
}
func (s *ListenerTestSuite) TestTracingNormalComms() {
conn, err := (&net.Dialer{}).DialContext(context.TODO(), "tcp", s.serverListener.Addr().String())
require.NoError(s.T(), err, "DialContext should successfully establish a conn here")
time.Sleep(5 * time.Millisecond)
assert.Contains(s.T(), fetchTraceEvents(s.T(), "net.ServerConn."+listenerName), conn.LocalAddr().String(),
"the /debug/trace/events page must contain the live connection")
time.Sleep(5 * time.Millisecond)
conn.Close()
}
func (s *ListenerTestSuite) TearDownSuite() {
if s.serverListener != nil {
s.T().Logf("stopped http.Server at: %v", s.serverListener.Addr().String())
s.serverListener.Close()
}
}
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