471 lines
12 KiB
Go
471 lines
12 KiB
Go
package healthcheck
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import (
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"context"
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"net/http"
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"net/http/httptest"
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"net/url"
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"sync"
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"testing"
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"time"
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"github.com/containous/traefik/pkg/config/runtime"
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"github.com/containous/traefik/pkg/testhelpers"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/vulcand/oxy/roundrobin"
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)
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const healthCheckInterval = 200 * time.Millisecond
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const healthCheckTimeout = 100 * time.Millisecond
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type testHandler struct {
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done func()
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healthSequence []int
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}
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func TestSetBackendsConfiguration(t *testing.T) {
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testCases := []struct {
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desc string
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startHealthy bool
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healthSequence []int
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expectedNumRemovedServers int
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expectedNumUpsertedServers int
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expectedGaugeValue float64
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}{
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{
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desc: "healthy server staying healthy",
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startHealthy: true,
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healthSequence: []int{http.StatusOK},
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expectedNumRemovedServers: 0,
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expectedNumUpsertedServers: 0,
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expectedGaugeValue: 1,
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},
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{
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desc: "healthy server staying healthy (StatusNoContent)",
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startHealthy: true,
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healthSequence: []int{http.StatusNoContent},
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expectedNumRemovedServers: 0,
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expectedNumUpsertedServers: 0,
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expectedGaugeValue: 1,
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},
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{
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desc: "healthy server staying healthy (StatusPermanentRedirect)",
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startHealthy: true,
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healthSequence: []int{http.StatusPermanentRedirect},
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expectedNumRemovedServers: 0,
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expectedNumUpsertedServers: 0,
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expectedGaugeValue: 1,
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},
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{
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desc: "healthy server becoming sick",
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startHealthy: true,
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healthSequence: []int{http.StatusServiceUnavailable},
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expectedNumRemovedServers: 1,
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expectedNumUpsertedServers: 0,
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expectedGaugeValue: 0,
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},
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{
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desc: "sick server becoming healthy",
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startHealthy: false,
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healthSequence: []int{http.StatusOK},
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expectedNumRemovedServers: 0,
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expectedNumUpsertedServers: 1,
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expectedGaugeValue: 1,
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},
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{
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desc: "sick server staying sick",
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startHealthy: false,
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healthSequence: []int{http.StatusServiceUnavailable},
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expectedNumRemovedServers: 0,
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expectedNumUpsertedServers: 0,
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expectedGaugeValue: 0,
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},
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{
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desc: "healthy server toggling to sick and back to healthy",
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startHealthy: true,
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healthSequence: []int{http.StatusServiceUnavailable, http.StatusOK},
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expectedNumRemovedServers: 1,
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expectedNumUpsertedServers: 1,
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expectedGaugeValue: 1,
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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t.Parallel()
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// The context is passed to the health check and canonically canceled by
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// the test server once all expected requests have been received.
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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ts := newTestServer(cancel, test.healthSequence)
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defer ts.Close()
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lb := &testLoadBalancer{RWMutex: &sync.RWMutex{}}
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backend := NewBackendConfig(Options{
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Path: "/path",
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Interval: healthCheckInterval,
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Timeout: healthCheckTimeout,
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LB: lb,
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}, "backendName")
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serverURL := testhelpers.MustParseURL(ts.URL)
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if test.startHealthy {
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lb.servers = append(lb.servers, serverURL)
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} else {
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backend.disabledURLs = append(backend.disabledURLs, backendURL{url: serverURL, weight: 1})
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}
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collectingMetrics := testhelpers.NewCollectingHealthCheckMetrics()
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check := HealthCheck{
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Backends: make(map[string]*BackendConfig),
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metrics: collectingMetrics,
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}
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wg := sync.WaitGroup{}
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wg.Add(1)
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go func() {
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check.execute(ctx, backend)
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wg.Done()
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}()
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// Make test timeout dependent on number of expected requests, health
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// check interval, and a safety margin.
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timeout := time.Duration(len(test.healthSequence)*int(healthCheckInterval) + 500)
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select {
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case <-time.After(timeout):
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t.Fatal("test did not complete in time")
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case <-ctx.Done():
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wg.Wait()
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}
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lb.Lock()
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defer lb.Unlock()
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assert.Equal(t, test.expectedNumRemovedServers, lb.numRemovedServers, "removed servers")
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assert.Equal(t, test.expectedNumUpsertedServers, lb.numUpsertedServers, "upserted servers")
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// FIXME re add metrics
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//assert.Equal(t, test.expectedGaugeValue, collectingMetrics.Gauge.GaugeValue, "ServerUp Gauge")
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})
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}
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}
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func TestNewRequest(t *testing.T) {
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type expected struct {
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err bool
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value string
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}
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testCases := []struct {
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desc string
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serverURL string
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options Options
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expected expected
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}{
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{
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desc: "no port override",
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serverURL: "http://backend1:80",
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options: Options{
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Path: "/test",
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Port: 0,
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},
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expected: expected{
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err: false,
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value: "http://backend1:80/test",
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},
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},
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{
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desc: "port override",
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serverURL: "http://backend2:80",
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options: Options{
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Path: "/test",
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Port: 8080,
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},
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expected: expected{
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err: false,
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value: "http://backend2:8080/test",
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},
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},
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{
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desc: "no port override with no port in server URL",
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serverURL: "http://backend1",
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options: Options{
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Path: "/health",
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Port: 0,
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},
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expected: expected{
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err: false,
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value: "http://backend1/health",
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},
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},
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{
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desc: "port override with no port in server URL",
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serverURL: "http://backend2",
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options: Options{
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Path: "/health",
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Port: 8080,
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},
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expected: expected{
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err: false,
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value: "http://backend2:8080/health",
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},
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},
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{
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desc: "scheme override",
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serverURL: "https://backend1:80",
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options: Options{
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Scheme: "http",
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Path: "/test",
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Port: 0,
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},
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expected: expected{
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err: false,
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value: "http://backend1:80/test",
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},
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},
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{
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desc: "path with param",
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serverURL: "http://backend1:80",
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options: Options{
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Path: "/health?powpow=do",
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Port: 0,
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},
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expected: expected{
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err: false,
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value: "http://backend1:80/health?powpow=do",
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},
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},
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{
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desc: "path with params",
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serverURL: "http://backend1:80",
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options: Options{
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Path: "/health?powpow=do&do=powpow",
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Port: 0,
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},
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expected: expected{
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err: false,
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value: "http://backend1:80/health?powpow=do&do=powpow",
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},
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},
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{
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desc: "path with invalid path",
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serverURL: "http://backend1:80",
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options: Options{
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Path: ":",
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Port: 0,
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},
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expected: expected{
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err: true,
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value: "",
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},
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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t.Parallel()
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backend := NewBackendConfig(test.options, "backendName")
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u := testhelpers.MustParseURL(test.serverURL)
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req, err := backend.newRequest(u)
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if test.expected.err {
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require.Error(t, err)
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assert.Nil(t, nil)
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} else {
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require.NoError(t, err, "failed to create new backend request")
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require.NotNil(t, req)
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assert.Equal(t, test.expected.value, req.URL.String())
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}
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})
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}
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}
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func TestAddHeadersAndHost(t *testing.T) {
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testCases := []struct {
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desc string
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serverURL string
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options Options
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expectedHostname string
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expectedHeader string
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}{
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{
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desc: "override hostname",
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serverURL: "http://backend1:80",
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options: Options{
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Hostname: "myhost",
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Path: "/",
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},
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expectedHostname: "myhost",
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expectedHeader: "",
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},
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{
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desc: "not override hostname",
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serverURL: "http://backend1:80",
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options: Options{
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Hostname: "",
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Path: "/",
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},
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expectedHostname: "backend1:80",
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expectedHeader: "",
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},
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{
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desc: "custom header",
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serverURL: "http://backend1:80",
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options: Options{
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Headers: map[string]string{"Custom-Header": "foo"},
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Hostname: "",
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Path: "/",
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},
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expectedHostname: "backend1:80",
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expectedHeader: "foo",
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},
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{
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desc: "custom header with hostname override",
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serverURL: "http://backend1:80",
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options: Options{
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Headers: map[string]string{"Custom-Header": "foo"},
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Hostname: "myhost",
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Path: "/",
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},
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expectedHostname: "myhost",
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expectedHeader: "foo",
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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t.Parallel()
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backend := NewBackendConfig(test.options, "backendName")
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u, err := url.Parse(test.serverURL)
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require.NoError(t, err)
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req, err := backend.newRequest(u)
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require.NoError(t, err, "failed to create new backend request")
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req = backend.addHeadersAndHost(req)
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assert.Equal(t, "http://backend1:80/", req.URL.String())
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assert.Equal(t, test.expectedHostname, req.Host)
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assert.Equal(t, test.expectedHeader, req.Header.Get("Custom-Header"))
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})
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}
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}
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type testLoadBalancer struct {
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// RWMutex needed due to parallel test execution: Both the system-under-test
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// and the test assertions reference the counters.
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*sync.RWMutex
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numRemovedServers int
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numUpsertedServers int
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servers []*url.URL
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// options is just to make sure that LBStatusUpdater forwards options on Upsert to its BalancerHandler
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options []roundrobin.ServerOption
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}
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func (lb *testLoadBalancer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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// noop
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}
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func (lb *testLoadBalancer) RemoveServer(u *url.URL) error {
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lb.Lock()
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defer lb.Unlock()
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lb.numRemovedServers++
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lb.removeServer(u)
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return nil
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}
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func (lb *testLoadBalancer) UpsertServer(u *url.URL, options ...roundrobin.ServerOption) error {
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lb.Lock()
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defer lb.Unlock()
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lb.numUpsertedServers++
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lb.servers = append(lb.servers, u)
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lb.options = append(lb.options, options...)
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return nil
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}
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func (lb *testLoadBalancer) Servers() []*url.URL {
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return lb.servers
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}
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func (lb *testLoadBalancer) Options() []roundrobin.ServerOption {
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return lb.options
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}
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func (lb *testLoadBalancer) removeServer(u *url.URL) {
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var i int
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var serverURL *url.URL
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found := false
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for i, serverURL = range lb.servers {
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if *serverURL == *u {
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found = true
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break
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}
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}
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if !found {
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return
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}
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lb.servers = append(lb.servers[:i], lb.servers[i+1:]...)
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}
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func newTestServer(done func(), healthSequence []int) *httptest.Server {
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handler := &testHandler{
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done: done,
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healthSequence: healthSequence,
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}
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return httptest.NewServer(handler)
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}
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// ServeHTTP returns HTTP response codes following a status sequences.
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// It calls the given 'done' function once all request health indicators have been depleted.
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func (th *testHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if len(th.healthSequence) == 0 {
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panic("received unexpected request")
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}
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w.WriteHeader(th.healthSequence[0])
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th.healthSequence = th.healthSequence[1:]
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if len(th.healthSequence) == 0 {
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th.done()
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}
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}
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func TestLBStatusUpdater(t *testing.T) {
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lb := &testLoadBalancer{RWMutex: &sync.RWMutex{}}
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svInfo := &runtime.ServiceInfo{}
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lbsu := NewLBStatusUpdater(lb, svInfo)
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newServer, err := url.Parse("http://foo.com")
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assert.Nil(t, err)
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err = lbsu.UpsertServer(newServer, roundrobin.Weight(1))
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assert.Nil(t, err)
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assert.Equal(t, len(lbsu.Servers()), 1)
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assert.Equal(t, len(lbsu.BalancerHandler.(*testLoadBalancer).Options()), 1)
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statuses := svInfo.GetAllStatus()
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assert.Equal(t, len(statuses), 1)
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for k, v := range statuses {
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assert.Equal(t, k, newServer.String())
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assert.Equal(t, v, serverUp)
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break
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}
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err = lbsu.RemoveServer(newServer)
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assert.Nil(t, err)
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assert.Equal(t, len(lbsu.Servers()), 0)
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statuses = svInfo.GetAllStatus()
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assert.Equal(t, len(statuses), 1)
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for k, v := range statuses {
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assert.Equal(t, k, newServer.String())
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assert.Equal(t, v, serverDown)
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break
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}
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}
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