traefik/pkg/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/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/traefik/traefik/v2/pkg/config/runtime"
"github.com/traefik/traefik/v2/pkg/testhelpers"
"github.com/vulcand/oxy/roundrobin"
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healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
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const (
healthCheckInterval = 200 * time.Millisecond
healthCheckTimeout = 100 * time.Millisecond
)
func TestSetBackendsConfiguration(t *testing.T) {
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testCases := []struct {
desc string
startHealthy bool
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mode string
server StartTestServer
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expectedNumRemovedServers int
expectedNumUpsertedServers int
expectedGaugeValue float64
}{
{
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desc: "healthy server staying healthy",
startHealthy: true,
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server: newHTTPServer(http.StatusOK),
expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 1,
},
{
desc: "healthy server staying healthy (StatusNoContent)",
startHealthy: true,
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server: newHTTPServer(http.StatusNoContent),
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expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 1,
},
{
desc: "healthy server staying healthy (StatusPermanentRedirect)",
startHealthy: true,
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server: newHTTPServer(http.StatusPermanentRedirect),
expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 1,
},
{
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desc: "healthy server becoming sick",
startHealthy: true,
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server: newHTTPServer(http.StatusServiceUnavailable),
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expectedNumRemovedServers: 1,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 0,
},
{
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desc: "sick server becoming healthy",
startHealthy: false,
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server: newHTTPServer(http.StatusOK),
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expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 1,
expectedGaugeValue: 1,
},
{
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desc: "sick server staying sick",
startHealthy: false,
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server: newHTTPServer(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,
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server: newHTTPServer(http.StatusServiceUnavailable, http.StatusOK),
expectedNumRemovedServers: 1,
expectedNumUpsertedServers: 1,
expectedGaugeValue: 1,
},
{
desc: "healthy grpc server staying healthy",
mode: "grpc",
startHealthy: true,
server: newGRPCServer(healthpb.HealthCheckResponse_SERVING),
expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 1,
},
{
desc: "healthy grpc server becoming sick",
mode: "grpc",
startHealthy: true,
server: newGRPCServer(healthpb.HealthCheckResponse_NOT_SERVING),
expectedNumRemovedServers: 1,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 0,
},
{
desc: "sick grpc server becoming healthy",
mode: "grpc",
startHealthy: false,
server: newGRPCServer(healthpb.HealthCheckResponse_SERVING),
expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 1,
expectedGaugeValue: 1,
},
{
desc: "sick grpc server staying sick",
mode: "grpc",
startHealthy: false,
server: newGRPCServer(healthpb.HealthCheckResponse_NOT_SERVING),
expectedNumRemovedServers: 0,
expectedNumUpsertedServers: 0,
expectedGaugeValue: 0,
},
{
desc: "healthy grpc server toggling to sick and back to healthy",
mode: "grpc",
startHealthy: true,
server: newGRPCServer(healthpb.HealthCheckResponse_NOT_SERVING, healthpb.HealthCheckResponse_SERVING),
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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())
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t.Cleanup(cancel)
serverURL, timeout := test.server.Start(t, cancel)
lb := &testLoadBalancer{RWMutex: &sync.RWMutex{}}
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options := Options{
Mode: test.mode,
Path: "/path",
Interval: healthCheckInterval,
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Timeout: healthCheckTimeout,
LB: lb,
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}
backend := NewBackendConfig(options, "backendName")
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if test.startHealthy {
lb.servers = append(lb.servers, serverURL)
} else {
backend.disabledURLs = append(backend.disabledURLs, backendURL{url: serverURL, weight: 1})
}
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collectingMetrics := &testhelpers.CollectingGauge{}
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check := HealthCheck{
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Backends: make(map[string]*BackendConfig),
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metrics: metricsHealthcheck{serverUpGauge: collectingMetrics},
}
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wg := sync.WaitGroup{}
wg.Add(1)
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go func() {
check.execute(ctx, backend)
wg.Done()
}()
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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assert.Equal(t, test.expectedGaugeValue, collectingMetrics.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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})
}
}
func TestRequestOptions(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
expectedMethod string
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}{
{
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desc: "override hostname",
serverURL: "http://backend1:80",
options: Options{
Hostname: "myhost",
Path: "/",
},
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expectedHostname: "myhost",
expectedHeader: "",
expectedMethod: http.MethodGet,
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},
{
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desc: "not override hostname",
serverURL: "http://backend1:80",
options: Options{
Hostname: "",
Path: "/",
},
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expectedHostname: "backend1:80",
expectedHeader: "",
expectedMethod: http.MethodGet,
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},
{
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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",
expectedMethod: http.MethodGet,
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},
{
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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",
expectedMethod: http.MethodGet,
},
{
desc: "custom method",
serverURL: "http://backend1:80",
options: Options{
Path: "/",
Method: http.MethodHead,
},
expectedHostname: "backend1:80",
expectedMethod: http.MethodHead,
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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, 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")
req = backend.setRequestOptions(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"))
assert.Equal(t, test.expectedMethod, req.Method)
})
}
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}
func TestBalancers_Servers(t *testing.T) {
server1, err := url.Parse("http://foo.com")
require.NoError(t, err)
balancer1, err := roundrobin.New(nil)
require.NoError(t, err)
err = balancer1.UpsertServer(server1)
require.NoError(t, err)
server2, err := url.Parse("http://foo.com")
require.NoError(t, err)
balancer2, err := roundrobin.New(nil)
require.NoError(t, err)
err = balancer2.UpsertServer(server2)
require.NoError(t, err)
balancers := Balancers([]Balancer{balancer1, balancer2})
want, err := url.Parse("http://foo.com")
require.NoError(t, err)
assert.Equal(t, 1, len(balancers.Servers()))
assert.Equal(t, want, balancers.Servers()[0])
}
func TestBalancers_UpsertServer(t *testing.T) {
balancer1, err := roundrobin.New(nil)
require.NoError(t, err)
balancer2, err := roundrobin.New(nil)
require.NoError(t, err)
want, err := url.Parse("http://foo.com")
require.NoError(t, err)
balancers := Balancers([]Balancer{balancer1, balancer2})
err = balancers.UpsertServer(want)
require.NoError(t, err)
assert.Equal(t, 1, len(balancer1.Servers()))
assert.Equal(t, want, balancer1.Servers()[0])
assert.Equal(t, 1, len(balancer2.Servers()))
assert.Equal(t, want, balancer2.Servers()[0])
}
func TestBalancers_RemoveServer(t *testing.T) {
server, err := url.Parse("http://foo.com")
require.NoError(t, err)
balancer1, err := roundrobin.New(nil)
require.NoError(t, err)
err = balancer1.UpsertServer(server)
require.NoError(t, err)
balancer2, err := roundrobin.New(nil)
require.NoError(t, err)
err = balancer2.UpsertServer(server)
require.NoError(t, err)
balancers := Balancers([]Balancer{balancer1, balancer2})
err = balancers.RemoveServer(server)
require.NoError(t, err)
assert.Equal(t, 0, len(balancer1.Servers()))
assert.Equal(t, 0, len(balancer2.Servers()))
}
func TestLBStatusUpdater(t *testing.T) {
lb := &testLoadBalancer{RWMutex: &sync.RWMutex{}}
svInfo := &runtime.ServiceInfo{}
lbsu := NewLBStatusUpdater(lb, svInfo, nil)
newServer, err := url.Parse("http://foo.com")
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assert.NoError(t, err)
err = lbsu.UpsertServer(newServer, roundrobin.Weight(1))
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assert.NoError(t, err)
assert.Equal(t, len(lbsu.Servers()), 1)
assert.Equal(t, len(lbsu.BalancerHandler.(*testLoadBalancer).Options()), 1)
statuses := svInfo.GetAllStatus()
assert.Equal(t, len(statuses), 1)
for k, v := range statuses {
assert.Equal(t, k, newServer.String())
assert.Equal(t, v, serverUp)
break
}
err = lbsu.RemoveServer(newServer)
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assert.NoError(t, err)
assert.Equal(t, len(lbsu.Servers()), 0)
statuses = svInfo.GetAllStatus()
assert.Equal(t, len(statuses), 1)
for k, v := range statuses {
assert.Equal(t, k, newServer.String())
assert.Equal(t, v, serverDown)
break
}
}
func TestNotFollowingRedirects(t *testing.T) {
redirectServerCalled := false
redirectTestServer := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
redirectServerCalled = true
}))
defer redirectTestServer.Close()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.Header().Add("location", redirectTestServer.URL)
rw.WriteHeader(http.StatusSeeOther)
cancel()
}))
defer server.Close()
lb := &testLoadBalancer{
RWMutex: &sync.RWMutex{},
servers: []*url.URL{testhelpers.MustParseURL(server.URL)},
}
backend := NewBackendConfig(Options{
Path: "/path",
Interval: healthCheckInterval,
Timeout: healthCheckTimeout,
LB: lb,
FollowRedirects: false,
}, "backendName")
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collectingMetrics := &testhelpers.CollectingGauge{}
check := HealthCheck{
Backends: make(map[string]*BackendConfig),
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metrics: metricsHealthcheck{serverUpGauge: collectingMetrics},
}
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
check.execute(ctx, backend)
wg.Done()
}()
timeout := time.Duration(int(healthCheckInterval) + 500)
select {
case <-time.After(timeout):
t.Fatal("test did not complete in time")
case <-ctx.Done():
wg.Wait()
}
assert.False(t, redirectServerCalled, "HTTP redirect must not be followed")
}