traefik/healthcheck/healthcheck_test.go

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