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distributor_test.go
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distributor_test.go
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package alertmanager
import (
"bytes"
"context"
"errors"
"fmt"
"math"
"net/http"
"net/http/httptest"
"net/url"
"sync"
"testing"
"time"
"github.com/go-kit/kit/log"
"github.com/grafana/dskit/flagext"
"github.com/grafana/dskit/kv"
"github.com/grafana/dskit/kv/consul"
"github.com/grafana/dskit/services"
"github.com/prometheus/client_golang/prometheus"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/weaveworks/common/httpgrpc"
"github.com/weaveworks/common/user"
"google.golang.org/grpc"
"google.golang.org/grpc/health/grpc_health_v1"
"github.com/cortexproject/cortex/pkg/alertmanager/alertmanagerpb"
"github.com/cortexproject/cortex/pkg/ring"
util_log "github.com/cortexproject/cortex/pkg/util/log"
"github.com/cortexproject/cortex/pkg/util/test"
)
func TestDistributor_DistributeRequest(t *testing.T) {
cases := []struct {
name string
numAM, numHappyAM int
replicationFactor int
isRead bool
isDelete bool
expStatusCode int
expectedTotalCalls int
headersNotPreserved bool
route string
// Paths where responses are merged, we need to supply a valid response body.
// Note that the actual merging logic is tested elsewhere (merger_test.go).
responseBody []byte
}{
{
name: "Write /alerts, Simple AM request, all AM healthy",
numAM: 4,
numHappyAM: 4,
replicationFactor: 3,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/alerts",
}, {
name: "Write /alerts, Less than quorum AM available",
numAM: 1,
numHappyAM: 1,
replicationFactor: 3,
expStatusCode: http.StatusInternalServerError,
expectedTotalCalls: 0,
headersNotPreserved: true, // There is nothing to preserve since it does not hit any AM.
route: "/alerts",
}, {
name: "Write /alerts, Less than quorum AM succeed",
numAM: 5,
numHappyAM: 3, // Though we have 3 happy, it will hit >1 unhappy AM.
replicationFactor: 3,
expStatusCode: http.StatusInternalServerError,
expectedTotalCalls: 3,
route: "/alerts",
}, {
name: "Read /v1/alerts is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v1/alerts",
responseBody: []byte(`{"status":"success","data":[]}`),
}, {
name: "Read /v2/alerts is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v2/alerts",
responseBody: []byte(`[]`),
}, {
name: "Read /v2/alerts/groups is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v2/alerts/groups",
responseBody: []byte(`[]`),
}, {
name: "Read /v1/alerts/groups not supported",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
expStatusCode: http.StatusNotFound,
expectedTotalCalls: 0,
headersNotPreserved: true,
route: "/v1/alerts/groups",
}, {
name: "Write /alerts/groups not supported",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
expStatusCode: http.StatusNotFound,
expectedTotalCalls: 0,
headersNotPreserved: true,
route: "/alerts/groups",
}, {
name: "Read /v1/silences is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v1/silences",
responseBody: []byte(`{"status":"success","data":[]}`),
}, {
name: "Read /v2/silences is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v2/silences",
responseBody: []byte(`[]`),
}, {
name: "Write /silences is sent to only 1 AM",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
expStatusCode: http.StatusOK,
expectedTotalCalls: 1,
route: "/silences",
}, {
name: "Read /v1/silence/id is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v1/silence/id",
responseBody: []byte(`{"status":"success","data":{"id":"aaa","updatedAt":"2020-01-01T00:00:00Z"}}`),
}, {
name: "Read /v2/silence/id is sent to 3 AMs",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 3,
route: "/v2/silence/id",
responseBody: []byte(`{"id":"aaa","updatedAt":"2020-01-01T00:00:00Z"}`),
},
{
name: "Write /silence/id not supported",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
expStatusCode: http.StatusNotFound,
expectedTotalCalls: 0,
headersNotPreserved: true,
route: "/silence/id",
}, {
name: "Delete /silence/id is sent to only 1 AM",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isDelete: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 1,
route: "/silence/id",
}, {
name: "Read /status is sent to only 1 AM",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 1,
route: "/status",
}, {
name: "Write /status not supported",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
expStatusCode: http.StatusNotFound,
expectedTotalCalls: 0,
headersNotPreserved: true,
route: "/status",
}, {
name: "Read /receivers is sent to only 1 AM",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
isRead: true,
expStatusCode: http.StatusOK,
expectedTotalCalls: 1,
route: "/receivers",
}, {
name: "Write /receivers not supported",
numAM: 5,
numHappyAM: 5,
replicationFactor: 3,
expStatusCode: http.StatusNotFound,
expectedTotalCalls: 0,
headersNotPreserved: true,
route: "/receivers",
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
route := "/alertmanager/api/v1" + c.route
d, ams, cleanup := prepare(t, c.numAM, c.numHappyAM, c.replicationFactor, c.responseBody)
t.Cleanup(cleanup)
ctx := user.InjectOrgID(context.Background(), "1")
url := "http://127.0.0.1:9999" + route
req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader([]byte{1, 2, 3, 4}))
require.NoError(t, err)
if c.isRead {
req.Method = http.MethodGet
} else if c.isDelete {
req.Method = http.MethodDelete
}
req.RequestURI = url
w := httptest.NewRecorder()
d.DistributeRequest(w, req)
resp := w.Result()
require.Equal(t, c.expStatusCode, resp.StatusCode)
if !c.headersNotPreserved {
// Making sure the headers are not altered.
contentType := []string{"it-is-ok"}
contentTypeOptions := []string{"ok-option-1", "ok-option-2"}
if resp.StatusCode != http.StatusOK {
contentType = []string{"it-is-not-ok"}
contentTypeOptions = []string{"not-ok-option-1", "not-ok-option-2"}
}
require.Equal(t, contentType, resp.Header.Values("Content-Type"))
require.Equal(t, contentTypeOptions, resp.Header.Values("X-Content-Type-Options"))
}
// Since the response is sent as soon as the quorum is reached, when we
// reach this point the 3rd AM may not have received the request yet.
// To avoid flaky test we retry until we hit the desired state within a reasonable timeout.
test.Poll(t, time.Second, c.expectedTotalCalls, func() interface{} {
totalReqCount := 0
for _, a := range ams {
reqCount := a.requestsCount(route)
// AM should not get duplicate requests.
require.True(t, reqCount <= 1, "duplicate requests %d", reqCount)
totalReqCount += reqCount
}
return totalReqCount
})
})
}
}
func TestDistributor_IsPathSupported(t *testing.T) {
supported := map[string]bool{
"/alertmanager/api/v1/alerts": true,
"/alertmanager/api/v1/alerts/groups": false,
"/alertmanager/api/v1/silences": true,
"/alertmanager/api/v1/silence/id": true,
"/alertmanager/api/v1/silence/anything": true,
"/alertmanager/api/v1/silence/really": true,
"/alertmanager/api/v1/status": true,
"/alertmanager/api/v1/receivers": true,
"/alertmanager/api/v1/other": false,
"/alertmanager/api/v2/alerts": true,
"/alertmanager/api/v2/alerts/groups": true,
"/alertmanager/api/v2/silences": true,
"/alertmanager/api/v2/silence/id": true,
"/alertmanager/api/v2/silence/anything": true,
"/alertmanager/api/v2/silence/really": true,
"/alertmanager/api/v2/status": true,
"/alertmanager/api/v2/receivers": true,
"/alertmanager/api/v2/other": false,
"/alertmanager/other": false,
"/other": false,
}
for path, isSupported := range supported {
t.Run(path, func(t *testing.T) {
d, _, cleanup := prepare(t, 1, 1, 1, []byte{})
t.Cleanup(cleanup)
require.Equal(t, isSupported, d.IsPathSupported(path))
})
}
}
func prepare(t *testing.T, numAM, numHappyAM, replicationFactor int, responseBody []byte) (*Distributor, []*mockAlertmanager, func()) {
ams := []*mockAlertmanager{}
for i := 0; i < numHappyAM; i++ {
ams = append(ams, newMockAlertmanager(i, true, responseBody))
}
for i := numHappyAM; i < numAM; i++ {
ams = append(ams, newMockAlertmanager(i, false, responseBody))
}
// Use a real ring with a mock KV store to test ring RF logic.
amDescs := map[string]ring.InstanceDesc{}
amByAddr := map[string]*mockAlertmanager{}
for i, a := range ams {
amDescs[a.myAddr] = ring.InstanceDesc{
Addr: a.myAddr,
Zone: "",
State: ring.ACTIVE,
Timestamp: time.Now().Unix(),
RegisteredTimestamp: time.Now().Add(-2 * time.Hour).Unix(),
Tokens: []uint32{uint32((math.MaxUint32 / numAM) * i)},
}
amByAddr[a.myAddr] = ams[i]
}
kvStore, closer := consul.NewInMemoryClient(ring.GetCodec(), log.NewNopLogger())
t.Cleanup(func() { assert.NoError(t, closer.Close()) })
err := kvStore.CAS(context.Background(), RingKey,
func(_ interface{}) (interface{}, bool, error) {
return &ring.Desc{
Ingesters: amDescs,
}, true, nil
},
)
require.NoError(t, err)
amRing, err := ring.New(ring.Config{
KVStore: kv.Config{
Mock: kvStore,
},
HeartbeatTimeout: 60 * time.Minute,
ReplicationFactor: replicationFactor,
}, RingNameForServer, RingKey, nil)
require.NoError(t, err)
require.NoError(t, services.StartAndAwaitRunning(context.Background(), amRing))
test.Poll(t, time.Second, numAM, func() interface{} {
return amRing.InstancesCount()
})
cfg := &MultitenantAlertmanagerConfig{}
flagext.DefaultValues(cfg)
d, err := NewDistributor(cfg.AlertmanagerClient, cfg.MaxRecvMsgSize, amRing, newMockAlertmanagerClientFactory(amByAddr), util_log.Logger, prometheus.NewRegistry())
require.NoError(t, err)
require.NoError(t, services.StartAndAwaitRunning(context.Background(), d))
return d, ams, func() {
require.NoError(t, services.StopAndAwaitTerminated(context.Background(), d))
}
}
type mockAlertmanager struct {
alertmanagerpb.AlertmanagerClient
grpc_health_v1.HealthClient
// receivedRequests is map of route -> statusCode -> number of requests.
receivedRequests map[string]map[int]int
mtx sync.Mutex
myAddr string
happy bool
responseBody []byte
}
func newMockAlertmanager(idx int, happy bool, responseBody []byte) *mockAlertmanager {
return &mockAlertmanager{
receivedRequests: make(map[string]map[int]int),
myAddr: fmt.Sprintf("127.0.0.1:%05d", 10000+idx),
happy: happy,
responseBody: responseBody,
}
}
func (am *mockAlertmanager) HandleRequest(_ context.Context, in *httpgrpc.HTTPRequest, _ ...grpc.CallOption) (*httpgrpc.HTTPResponse, error) {
am.mtx.Lock()
defer am.mtx.Unlock()
u, err := url.Parse(in.Url)
if err != nil {
return nil, err
}
path := u.Path
m, ok := am.receivedRequests[path]
if !ok {
m = make(map[int]int)
am.receivedRequests[path] = m
}
if am.happy {
m[http.StatusOK]++
return &httpgrpc.HTTPResponse{
Code: http.StatusOK,
Headers: []*httpgrpc.Header{
{
Key: "Content-Type",
Values: []string{"it-is-ok"},
}, {
Key: "X-Content-Type-Options",
Values: []string{"ok-option-1", "ok-option-2"},
},
},
Body: am.responseBody,
}, nil
}
m[http.StatusInternalServerError]++
return nil, httpgrpc.ErrorFromHTTPResponse(&httpgrpc.HTTPResponse{
Code: http.StatusInternalServerError,
Headers: []*httpgrpc.Header{
{
Key: "Content-Type",
Values: []string{"it-is-not-ok"},
}, {
Key: "X-Content-Type-Options",
Values: []string{"not-ok-option-1", "not-ok-option-2"},
},
},
})
}
func (am *mockAlertmanager) requestsCount(route string) int {
am.mtx.Lock()
defer am.mtx.Unlock()
routeMap, ok := am.receivedRequests[route]
if !ok {
return 0
}
// The status could be something other than overall
// expected status because of quorum logic.
reqCount := 0
for _, count := range routeMap {
reqCount += count
}
return reqCount
}
func (am *mockAlertmanager) Close() error {
return nil
}
func (am *mockAlertmanager) RemoteAddress() string {
return am.myAddr
}
type mockAlertmanagerClientFactory struct {
alertmanagerByAddr map[string]*mockAlertmanager
}
func newMockAlertmanagerClientFactory(alertmanagerByAddr map[string]*mockAlertmanager) ClientsPool {
return &mockAlertmanagerClientFactory{alertmanagerByAddr: alertmanagerByAddr}
}
func (f *mockAlertmanagerClientFactory) GetClientFor(addr string) (Client, error) {
c, ok := f.alertmanagerByAddr[addr]
if !ok {
return nil, errors.New("client not found")
}
return Client(c), nil
}