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"
ptypes "github.com/traefik/paerser/types"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/config/runtime"
"github.com/traefik/traefik/v3/pkg/testhelpers"
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healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
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const delta float64 = 1e-10
func TestNewServiceHealthChecker_durations(t *testing.T) {
testCases := []struct {
desc string
config *dynamic.ServerHealthCheck
expInterval time.Duration
expTimeout time.Duration
}{
{
desc: "default values",
config: &dynamic.ServerHealthCheck{},
expInterval: time.Duration(dynamic.DefaultHealthCheckInterval),
expTimeout: time.Duration(dynamic.DefaultHealthCheckTimeout),
},
{
desc: "out of range values",
config: &dynamic.ServerHealthCheck{
Interval: ptypes.Duration(-time.Second),
Timeout: ptypes.Duration(-time.Second),
},
expInterval: time.Duration(dynamic.DefaultHealthCheckInterval),
expTimeout: time.Duration(dynamic.DefaultHealthCheckTimeout),
},
{
desc: "custom durations",
config: &dynamic.ServerHealthCheck{
Interval: ptypes.Duration(time.Second * 10),
Timeout: ptypes.Duration(time.Second * 5),
},
expInterval: time.Second * 10,
expTimeout: time.Second * 5,
},
{
desc: "interval shorter than timeout",
config: &dynamic.ServerHealthCheck{
Interval: ptypes.Duration(time.Second),
Timeout: ptypes.Duration(time.Second * 5),
},
expInterval: time.Second,
expTimeout: time.Second * 5,
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
healthChecker := NewServiceHealthChecker(context.Background(), nil, test.config, nil, nil, http.DefaultTransport, nil)
assert.Equal(t, test.expInterval, healthChecker.interval)
assert.Equal(t, test.expTimeout, healthChecker.timeout)
})
}
}
func TestServiceHealthChecker_newRequest(t *testing.T) {
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testCases := []struct {
desc string
targetURL string
config dynamic.ServerHealthCheck
expTarget string
expError bool
expHostname string
expHeader string
expMethod string
}{
{
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desc: "no port override",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Path: "/test",
Port: 0,
},
expError: false,
expTarget: "http://backend1:80/test",
expHostname: "backend1:80",
expMethod: http.MethodGet,
},
{
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desc: "port override",
targetURL: "http://backend2:80",
config: dynamic.ServerHealthCheck{
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Path: "/test",
Port: 8080,
},
expError: false,
expTarget: "http://backend2:8080/test",
expHostname: "backend2:8080",
expMethod: http.MethodGet,
},
{
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desc: "no port override with no port in server URL",
targetURL: "http://backend1",
config: dynamic.ServerHealthCheck{
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Path: "/health",
Port: 0,
},
expError: false,
expTarget: "http://backend1/health",
expHostname: "backend1",
expMethod: http.MethodGet,
},
{
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desc: "port override with no port in server URL",
targetURL: "http://backend2",
config: dynamic.ServerHealthCheck{
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Path: "/health",
Port: 8080,
},
expError: false,
expTarget: "http://backend2:8080/health",
expHostname: "backend2:8080",
expMethod: http.MethodGet,
},
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{
desc: "scheme override",
targetURL: "https://backend1:80",
config: dynamic.ServerHealthCheck{
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Scheme: "http",
Path: "/test",
Port: 0,
},
expError: false,
expTarget: "http://backend1:80/test",
expHostname: "backend1:80",
expMethod: http.MethodGet,
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},
{
desc: "path with param",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Path: "/health?powpow=do",
Port: 0,
},
expError: false,
expTarget: "http://backend1:80/health?powpow=do",
expHostname: "backend1:80",
expMethod: http.MethodGet,
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},
{
desc: "path with params",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Path: "/health?powpow=do&do=powpow",
Port: 0,
},
expError: false,
expTarget: "http://backend1:80/health?powpow=do&do=powpow",
expHostname: "backend1:80",
expMethod: http.MethodGet,
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},
{
desc: "path with invalid path",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Path: ":",
Port: 0,
},
expError: true,
expTarget: "",
expHostname: "backend1:80",
expMethod: http.MethodGet,
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},
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{
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desc: "override hostname",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Hostname: "myhost",
Path: "/",
},
expTarget: "http://backend1:80/",
expHostname: "myhost",
expHeader: "",
expMethod: http.MethodGet,
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},
{
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desc: "not override hostname",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Hostname: "",
Path: "/",
},
expTarget: "http://backend1:80/",
expHostname: "backend1:80",
expHeader: "",
expMethod: http.MethodGet,
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},
{
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desc: "custom header",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Headers: map[string]string{"Custom-Header": "foo"},
Hostname: "",
Path: "/",
},
expTarget: "http://backend1:80/",
expHostname: "backend1:80",
expHeader: "foo",
expMethod: http.MethodGet,
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},
{
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desc: "custom header with hostname override",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
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Headers: map[string]string{"Custom-Header": "foo"},
Hostname: "myhost",
Path: "/",
},
expTarget: "http://backend1:80/",
expHostname: "myhost",
expHeader: "foo",
expMethod: http.MethodGet,
},
{
desc: "custom method",
targetURL: "http://backend1:80",
config: dynamic.ServerHealthCheck{
Path: "/",
Method: http.MethodHead,
},
expTarget: "http://backend1:80/",
expHostname: "backend1:80",
expMethod: http.MethodHead,
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},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
shc := ServiceHealthChecker{config: &test.config}
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u := testhelpers.MustParseURL(test.targetURL)
req, err := shc.newRequest(context.Background(), u)
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if test.expError {
require.Error(t, err)
assert.Nil(t, req)
} else {
require.NoError(t, err, "failed to create new request")
require.NotNil(t, req)
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assert.Equal(t, test.expTarget, req.URL.String())
assert.Equal(t, test.expHeader, req.Header.Get("Custom-Header"))
assert.Equal(t, test.expHostname, req.Host)
assert.Equal(t, test.expMethod, req.Method)
}
})
}
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}
func TestServiceHealthChecker_checkHealthHTTP_NotFollowingRedirects(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.WithTimeout(context.Background(), time.Duration(dynamic.DefaultHealthCheckTimeout))
defer cancel()
server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.Header().Add("location", redirectTestServer.URL)
rw.WriteHeader(http.StatusSeeOther)
}))
defer server.Close()
config := &dynamic.ServerHealthCheck{
Path: "/path",
FollowRedirects: Bool(false),
Interval: dynamic.DefaultHealthCheckInterval,
Timeout: dynamic.DefaultHealthCheckTimeout,
}
healthChecker := NewServiceHealthChecker(ctx, nil, config, nil, nil, http.DefaultTransport, nil)
err := healthChecker.checkHealthHTTP(ctx, testhelpers.MustParseURL(server.URL))
require.NoError(t, err)
assert.False(t, redirectServerCalled, "HTTP redirect must not be followed")
}
func TestServiceHealthChecker_Launch(t *testing.T) {
testCases := []struct {
desc string
mode string
status int
server StartTestServer
expNumRemovedServers int
expNumUpsertedServers int
expGaugeValue float64
targetStatus string
}{
{
desc: "healthy server staying healthy",
server: newHTTPServer(http.StatusOK),
expNumRemovedServers: 0,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
{
desc: "healthy server staying healthy, with custom code status check",
server: newHTTPServer(http.StatusNotFound),
status: http.StatusNotFound,
expNumRemovedServers: 0,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
{
desc: "healthy server staying healthy (StatusNoContent)",
server: newHTTPServer(http.StatusNoContent),
expNumRemovedServers: 0,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
{
desc: "healthy server staying healthy (StatusPermanentRedirect)",
server: newHTTPServer(http.StatusPermanentRedirect),
expNumRemovedServers: 0,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
{
desc: "healthy server becoming sick",
server: newHTTPServer(http.StatusServiceUnavailable),
expNumRemovedServers: 1,
expNumUpsertedServers: 0,
expGaugeValue: 0,
targetStatus: runtime.StatusDown,
},
{
desc: "healthy server becoming sick, with custom code status check",
server: newHTTPServer(http.StatusOK),
status: http.StatusServiceUnavailable,
expNumRemovedServers: 1,
expNumUpsertedServers: 0,
expGaugeValue: 0,
targetStatus: runtime.StatusDown,
},
{
desc: "healthy server toggling to sick and back to healthy",
server: newHTTPServer(http.StatusServiceUnavailable, http.StatusOK),
expNumRemovedServers: 1,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
{
desc: "healthy server toggling to healthy and go to sick",
server: newHTTPServer(http.StatusOK, http.StatusServiceUnavailable),
expNumRemovedServers: 1,
expNumUpsertedServers: 1,
expGaugeValue: 0,
targetStatus: runtime.StatusDown,
},
{
desc: "healthy grpc server staying healthy",
mode: "grpc",
server: newGRPCServer(healthpb.HealthCheckResponse_SERVING),
expNumRemovedServers: 0,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
{
desc: "healthy grpc server becoming sick",
mode: "grpc",
server: newGRPCServer(healthpb.HealthCheckResponse_NOT_SERVING),
expNumRemovedServers: 1,
expNumUpsertedServers: 0,
expGaugeValue: 0,
targetStatus: runtime.StatusDown,
},
{
desc: "healthy grpc server toggling to sick and back to healthy",
mode: "grpc",
server: newGRPCServer(healthpb.HealthCheckResponse_NOT_SERVING, healthpb.HealthCheckResponse_SERVING),
expNumRemovedServers: 1,
expNumUpsertedServers: 1,
expGaugeValue: 1,
targetStatus: runtime.StatusUp,
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
// 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())
t.Cleanup(cancel)
targetURL, timeout := test.server.Start(t, cancel)
lb := &testLoadBalancer{RWMutex: &sync.RWMutex{}}
config := &dynamic.ServerHealthCheck{
Mode: test.mode,
Status: test.status,
Path: "/path",
Interval: ptypes.Duration(500 * time.Millisecond),
Timeout: ptypes.Duration(499 * time.Millisecond),
}
gauge := &testhelpers.CollectingGauge{}
serviceInfo := &runtime.ServiceInfo{}
hc := NewServiceHealthChecker(ctx, &MetricsMock{gauge}, config, lb, serviceInfo, http.DefaultTransport, map[string]*url.URL{"test": targetURL})
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
hc.Launch(ctx)
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()
assert.Equal(t, test.expNumRemovedServers, lb.numRemovedServers, "removed servers")
assert.Equal(t, test.expNumUpsertedServers, lb.numUpsertedServers, "upserted servers")
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assert.InDelta(t, test.expGaugeValue, gauge.GaugeValue, delta, "ServerUp Gauge")
assert.Equal(t, map[string]string{targetURL.String(): test.targetStatus}, serviceInfo.GetAllStatus())
})
}
}
func Bool(b bool) *bool {
return &b
}