Begin adding syncapi component tests (#2442)

* Add very basic syncapi tests

* Add a way to inject jetstream messages

* implement add_state_ids

* bugfixes

* Unbreak tests

* Remove now un-needed API call

* Linting

9 files changed, 337 insertions, 11 deletions

diff --git a/federationapi/federationapi_keys_test.go b/federationapi/federationapi_keys_test.go
index 4774c882..31e9a4c7 100644
--- a/federationapi/federationapi_keys_test.go
+++ b/federationapi/federationapi_keys_test.go
@@ -102,7 +102,7 @@ func TestMain(m *testing.M) {
 		)
 
 		// Finally, build the server key APIs.
-		sbase := base.NewBaseDendrite(cfg, "Monolith", base.NoCacheMetrics)
+		sbase := base.NewBaseDendrite(cfg, "Monolith", base.DisableMetrics)
 		s.api = NewInternalAPI(sbase, s.fedclient, nil, s.cache, nil, true)
 	}
 
diff --git a/setup/base/base.go b/setup/base/base.go
index 0e7528a0..5cbd7da9 100644
--- a/setup/base/base.go
+++ b/setup/base/base.go
@@ -86,6 +86,7 @@ type BaseDendrite struct {
 	DNSCache               *gomatrixserverlib.DNSCache
 	Database               *sql.DB
 	DatabaseWriter         sqlutil.Writer
+	EnableMetrics          bool
 }
 
 const NoListener = ""
@@ -96,7 +97,7 @@ const HTTPClientTimeout = time.Second * 30
 type BaseDendriteOptions int
 
 const (
-	NoCacheMetrics BaseDendriteOptions = iota
+	DisableMetrics BaseDendriteOptions = iota
 	UseHTTPAPIs
 	PolylithMode
 )
@@ -107,12 +108,12 @@ const (
 func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...BaseDendriteOptions) *BaseDendrite {
 	platformSanityChecks()
 	useHTTPAPIs := false
-	cacheMetrics := true
+	enableMetrics := true
 	isMonolith := true
 	for _, opt := range options {
 		switch opt {
-		case NoCacheMetrics:
-			cacheMetrics = false
+		case DisableMetrics:
+			enableMetrics = false
 		case UseHTTPAPIs:
 			useHTTPAPIs = true
 		case PolylithMode:
@@ -160,7 +161,7 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...Base
 		}
 	}
 
-	cache, err := caching.NewInMemoryLRUCache(cacheMetrics)
+	cache, err := caching.NewInMemoryLRUCache(enableMetrics)
 	if err != nil {
 		logrus.WithError(err).Warnf("Failed to create cache")
 	}
@@ -246,6 +247,7 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...Base
 		apiHttpClient:          &apiClient,
 		Database:               db,     // set if monolith with global connection pool only
 		DatabaseWriter:         writer, // set if monolith with global connection pool only
+		EnableMetrics:          enableMetrics,
 	}
 }
 
diff --git a/setup/jetstream/nats.go b/setup/jetstream/nats.go
index 426f02bb..248b0e65 100644
--- a/setup/jetstream/nats.go
+++ b/setup/jetstream/nats.go
@@ -13,6 +13,7 @@ import (
 	"github.com/sirupsen/logrus"
 
 	natsserver "github.com/nats-io/nats-server/v2/server"
+	"github.com/nats-io/nats.go"
 	natsclient "github.com/nats-io/nats.go"
 )
 
@@ -21,6 +22,13 @@ type NATSInstance struct {
 	sync.Mutex
 }
 
+func DeleteAllStreams(js nats.JetStreamContext, cfg *config.JetStream) {
+	for _, stream := range streams { // streams are defined in streams.go
+		name := cfg.Prefixed(stream.Name)
+		_ = js.DeleteStream(name)
+	}
+}
+
 func (s *NATSInstance) Prepare(process *process.ProcessContext, cfg *config.JetStream) (natsclient.JetStreamContext, *natsclient.Conn) {
 	// check if we need an in-process NATS Server
 	if len(cfg.Addresses) != 0 {
diff --git a/syncapi/sync/requestpool.go b/syncapi/sync/requestpool.go
index 99d1e40c..8ab13091 100644
--- a/syncapi/sync/requestpool.go
+++ b/syncapi/sync/requestpool.go
@@ -65,11 +65,13 @@ func NewRequestPool(
 	userAPI userapi.SyncUserAPI, keyAPI keyapi.SyncKeyAPI,
 	rsAPI roomserverAPI.SyncRoomserverAPI,
 	streams *streams.Streams, notifier *notifier.Notifier,
-	producer PresencePublisher,
+	producer PresencePublisher, enableMetrics bool,
 ) *RequestPool {
-	prometheus.MustRegister(
-		activeSyncRequests, waitingSyncRequests,
-	)
+	if enableMetrics {
+		prometheus.MustRegister(
+			activeSyncRequests, waitingSyncRequests,
+		)
+	}
 	rp := &RequestPool{
 		db:       db,
 		cfg:      cfg,
diff --git a/syncapi/syncapi.go b/syncapi/syncapi.go
index dbc6e240..d8bacb2d 100644
--- a/syncapi/syncapi.go
+++ b/syncapi/syncapi.go
@@ -65,7 +65,7 @@ func AddPublicRoutes(
 		JetStream: js,
 	}
 
-	requestPool := sync.NewRequestPool(syncDB, cfg, userAPI, keyAPI, rsAPI, streams, notifier, federationPresenceProducer)
+	requestPool := sync.NewRequestPool(syncDB, cfg, userAPI, keyAPI, rsAPI, streams, notifier, federationPresenceProducer, base.EnableMetrics)
 
 	userAPIStreamEventProducer := &producers.UserAPIStreamEventProducer{
 		JetStream: js,
diff --git a/syncapi/syncapi_test.go b/syncapi/syncapi_test.go
new file mode 100644
index 00000000..12b5178d
--- /dev/null
+++ b/syncapi/syncapi_test.go
@@ -0,0 +1,162 @@
+package syncapi
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	keyapi "github.com/matrix-org/dendrite/keyserver/api"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	rsapi "github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/setup/jetstream"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/dendrite/test"
+	userapi "github.com/matrix-org/dendrite/userapi/api"
+	"github.com/nats-io/nats.go"
+)
+
+type syncRoomserverAPI struct {
+	rsapi.SyncRoomserverAPI
+	rooms []*test.Room
+}
+
+func (s *syncRoomserverAPI) QueryLatestEventsAndState(ctx context.Context, req *rsapi.QueryLatestEventsAndStateRequest, res *rsapi.QueryLatestEventsAndStateResponse) error {
+	var room *test.Room
+	for _, r := range s.rooms {
+		if r.ID == req.RoomID {
+			room = r
+			break
+		}
+	}
+	if room == nil {
+		res.RoomExists = false
+		return nil
+	}
+	res.RoomVersion = room.Version
+	return nil // TODO: return state
+}
+
+type syncUserAPI struct {
+	userapi.SyncUserAPI
+	accounts []userapi.Device
+}
+
+func (s *syncUserAPI) QueryAccessToken(ctx context.Context, req *userapi.QueryAccessTokenRequest, res *userapi.QueryAccessTokenResponse) error {
+	for _, acc := range s.accounts {
+		if acc.AccessToken == req.AccessToken {
+			res.Device = &acc
+			return nil
+		}
+	}
+	res.Err = "unknown user"
+	return nil
+}
+
+func (s *syncUserAPI) PerformLastSeenUpdate(ctx context.Context, req *userapi.PerformLastSeenUpdateRequest, res *userapi.PerformLastSeenUpdateResponse) error {
+	return nil
+}
+
+type syncKeyAPI struct {
+	keyapi.KeyInternalAPI
+}
+
+func TestSyncAPI(t *testing.T) {
+	test.WithAllDatabases(t, func(t *testing.T, dbType test.DBType) {
+		testSync(t, dbType)
+	})
+}
+
+func testSync(t *testing.T, dbType test.DBType) {
+	user := test.NewUser()
+	room := test.NewRoom(t, user)
+	alice := userapi.Device{
+		ID:          "ALICEID",
+		UserID:      user.ID,
+		AccessToken: "ALICE_BEARER_TOKEN",
+		DisplayName: "Alice",
+		AccountType: userapi.AccountTypeUser,
+	}
+
+	base, close := test.CreateBaseDendrite(t, dbType)
+	defer close()
+
+	jsctx, _ := base.NATS.Prepare(base.ProcessContext, &base.Cfg.Global.JetStream)
+	defer jetstream.DeleteAllStreams(jsctx, &base.Cfg.Global.JetStream)
+	var msgs []*nats.Msg
+	for _, ev := range room.Events() {
+		var addsStateIDs []string
+		if ev.StateKey() != nil {
+			addsStateIDs = append(addsStateIDs, ev.EventID())
+		}
+		msgs = append(msgs, test.NewOutputEventMsg(t, base, room.ID, api.OutputEvent{
+			Type: rsapi.OutputTypeNewRoomEvent,
+			NewRoomEvent: &rsapi.OutputNewRoomEvent{
+				Event:             ev,
+				AddsStateEventIDs: addsStateIDs,
+			},
+		}))
+	}
+	AddPublicRoutes(base, &syncUserAPI{accounts: []userapi.Device{alice}}, &syncRoomserverAPI{rooms: []*test.Room{room}}, &syncKeyAPI{})
+	test.MustPublishMsgs(t, jsctx, msgs...)
+
+	testCases := []struct {
+		name            string
+		req             *http.Request
+		wantCode        int
+		wantJoinedRooms []string
+	}{
+		{
+			name: "missing access token",
+			req: test.NewRequest(t, "GET", "/_matrix/client/v3/sync", test.WithQueryParams(map[string]string{
+				"timeout": "0",
+			})),
+			wantCode: 401,
+		},
+		{
+			name: "unknown access token",
+			req: test.NewRequest(t, "GET", "/_matrix/client/v3/sync", test.WithQueryParams(map[string]string{
+				"access_token": "foo",
+				"timeout":      "0",
+			})),
+			wantCode: 401,
+		},
+		{
+			name: "valid access token",
+			req: test.NewRequest(t, "GET", "/_matrix/client/v3/sync", test.WithQueryParams(map[string]string{
+				"access_token": alice.AccessToken,
+				"timeout":      "0",
+			})),
+			wantCode:        200,
+			wantJoinedRooms: []string{room.ID},
+		},
+	}
+	// TODO: find a better way
+	time.Sleep(500 * time.Millisecond)
+
+	for _, tc := range testCases {
+		w := httptest.NewRecorder()
+		base.PublicClientAPIMux.ServeHTTP(w, tc.req)
+		if w.Code != tc.wantCode {
+			t.Fatalf("%s: got HTTP %d want %d", tc.name, w.Code, tc.wantCode)
+		}
+		if tc.wantJoinedRooms != nil {
+			var res types.Response
+			if err := json.NewDecoder(w.Body).Decode(&res); err != nil {
+				t.Fatalf("%s: failed to decode response body: %s", tc.name, err)
+			}
+			if len(res.Rooms.Join) != len(tc.wantJoinedRooms) {
+				t.Errorf("%s: got %v joined rooms, want %v.\nResponse: %+v", tc.name, len(res.Rooms.Join), len(tc.wantJoinedRooms), res)
+			}
+			t.Logf("res: %+v", res.Rooms.Join[room.ID])
+
+			gotEventIDs := make([]string, len(res.Rooms.Join[room.ID].Timeline.Events))
+			for i, ev := range res.Rooms.Join[room.ID].Timeline.Events {
+				gotEventIDs[i] = ev.EventID
+			}
+			test.AssertEventIDsEqual(t, gotEventIDs, room.Events())
+		}
+	}
+}
diff --git a/test/base.go b/test/base.go
index 32fc8dc5..664442c0 100644
--- a/test/base.go
+++ b/test/base.go
@@ -1,11 +1,83 @@
+// Copyright 2022 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package test
 
 import (
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"strings"
+	"testing"
+
 	"github.com/matrix-org/dendrite/setup/base"
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/nats-io/nats.go"
 )
 
+func CreateBaseDendrite(t *testing.T, dbType DBType) (*base.BaseDendrite, func()) {
+	var cfg config.Dendrite
+	cfg.Defaults(false)
+	cfg.Global.JetStream.InMemory = true
+
+	switch dbType {
+	case DBTypePostgres:
+		cfg.Global.Defaults(true)   // autogen a signing key
+		cfg.MediaAPI.Defaults(true) // autogen a media path
+		// use a distinct prefix else concurrent postgres/sqlite runs will clash since NATS will use
+		// the file system event with InMemory=true :(
+		cfg.Global.JetStream.TopicPrefix = fmt.Sprintf("Test_%d_", dbType)
+		connStr, close := PrepareDBConnectionString(t, dbType)
+		cfg.Global.DatabaseOptions = config.DatabaseOptions{
+			ConnectionString:       config.DataSource(connStr),
+			MaxOpenConnections:     10,
+			MaxIdleConnections:     2,
+			ConnMaxLifetimeSeconds: 60,
+		}
+		return base.NewBaseDendrite(&cfg, "Test", base.DisableMetrics), close
+	case DBTypeSQLite:
+		cfg.Defaults(true) // sets a sqlite db per component
+		// use a distinct prefix else concurrent postgres/sqlite runs will clash since NATS will use
+		// the file system event with InMemory=true :(
+		cfg.Global.JetStream.TopicPrefix = fmt.Sprintf("Test_%d_", dbType)
+		return base.NewBaseDendrite(&cfg, "Test", base.DisableMetrics), func() {
+			// cleanup db files. This risks getting out of sync as we add more database strings :(
+			dbFiles := []config.DataSource{
+				cfg.AppServiceAPI.Database.ConnectionString,
+				cfg.FederationAPI.Database.ConnectionString,
+				cfg.KeyServer.Database.ConnectionString,
+				cfg.MSCs.Database.ConnectionString,
+				cfg.MediaAPI.Database.ConnectionString,
+				cfg.RoomServer.Database.ConnectionString,
+				cfg.SyncAPI.Database.ConnectionString,
+				cfg.UserAPI.AccountDatabase.ConnectionString,
+			}
+			for _, fileURI := range dbFiles {
+				path := strings.TrimPrefix(string(fileURI), "file:")
+				err := os.Remove(path)
+				if err != nil && !errors.Is(err, fs.ErrNotExist) {
+					t.Fatalf("failed to cleanup sqlite db '%s': %s", fileURI, err)
+				}
+			}
+		}
+	default:
+		t.Fatalf("unknown db type: %v", dbType)
+	}
+	return nil, nil
+}
+
 func Base(cfg *config.Dendrite) (*base.BaseDendrite, nats.JetStreamContext, *nats.Conn) {
 	if cfg == nil {
 		cfg = &config.Dendrite{}
diff --git a/test/http.go b/test/http.go
new file mode 100644
index 00000000..a458a338
--- /dev/null
+++ b/test/http.go
@@ -0,0 +1,45 @@
+package test
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/url"
+	"testing"
+)
+
+type HTTPRequestOpt func(req *http.Request)
+
+func WithJSONBody(t *testing.T, body interface{}) HTTPRequestOpt {
+	t.Helper()
+	b, err := json.Marshal(body)
+	if err != nil {
+		t.Fatalf("WithJSONBody: %s", err)
+	}
+	return func(req *http.Request) {
+		req.Body = io.NopCloser(bytes.NewBuffer(b))
+	}
+}
+
+func WithQueryParams(qps map[string]string) HTTPRequestOpt {
+	var vals url.Values = map[string][]string{}
+	for k, v := range qps {
+		vals.Set(k, v)
+	}
+	return func(req *http.Request) {
+		req.URL.RawQuery = vals.Encode()
+	}
+}
+
+func NewRequest(t *testing.T, method, path string, opts ...HTTPRequestOpt) *http.Request {
+	t.Helper()
+	req, err := http.NewRequest(method, "http://localhost"+path, nil)
+	if err != nil {
+		t.Fatalf("failed to make new HTTP request %v %v : %v", method, path, err)
+	}
+	for _, o := range opts {
+		o(req)
+	}
+	return req
+}
diff --git a/test/jetstream.go b/test/jetstream.go
new file mode 100644
index 00000000..488c22be
--- /dev/null
+++ b/test/jetstream.go
@@ -0,0 +1,35 @@
+package test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/setup/base"
+	"github.com/matrix-org/dendrite/setup/jetstream"
+	"github.com/nats-io/nats.go"
+)
+
+func MustPublishMsgs(t *testing.T, jsctx nats.JetStreamContext, msgs ...*nats.Msg) {
+	t.Helper()
+	for _, msg := range msgs {
+		if _, err := jsctx.PublishMsg(msg); err != nil {
+			t.Fatalf("MustPublishMsgs: failed to publish message: %s", err)
+		}
+	}
+}
+
+func NewOutputEventMsg(t *testing.T, base *base.BaseDendrite, roomID string, update api.OutputEvent) *nats.Msg {
+	t.Helper()
+	msg := &nats.Msg{
+		Subject: base.Cfg.Global.JetStream.Prefixed(jetstream.OutputRoomEvent),
+		Header:  nats.Header{},
+	}
+	msg.Header.Set(jetstream.RoomID, roomID)
+	var err error
+	msg.Data, err = json.Marshal(update)
+	if err != nil {
+		t.Fatalf("failed to marshal update: %s", err)
+	}
+	return msg
+}