Streaming (#49)

Add new status and notification websocket streaming capabilities

go.mod

@@ -26,6 +26,7 @@ require (
 	github.com/golang/mock v1.5.0 // indirect
 	github.com/google/uuid v1.2.0
 	github.com/gorilla/sessions v1.2.1 // indirect
+	github.com/gorilla/websocket v1.4.2
 	github.com/h2non/filetype v1.1.1
 	github.com/json-iterator/go v1.1.11 // indirect
 	github.com/leodido/go-urn v1.2.1 // indirect

internal/api/client/streaming/stream.go

@@ -0,0 +1,89 @@
+package streaming
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gorilla/websocket"
+)
+
+// StreamGETHandler handles the creation of a new websocket streaming request.
+func (m *Module) StreamGETHandler(c *gin.Context) {
+	l := m.log.WithField("func", "StreamGETHandler")
+
+	streamType := c.Query(StreamQueryKey)
+	if streamType == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("no stream type provided under query key %s", StreamQueryKey)})
+		return
+	}
+
+	accessToken := c.Query(AccessTokenQueryKey)
+	if accessToken == "" {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": fmt.Sprintf("no access token provided under query key %s", AccessTokenQueryKey)})
+		return
+	}
+
+	// make sure a valid token has been provided and obtain the associated account
+	account, err := m.processor.AuthorizeStreamingRequest(accessToken)
+	if err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "could not authorize with given token"})
+		return
+	}
+
+	// prepare to upgrade the connection to a websocket connection
+	upgrader := websocket.Upgrader{
+		ReadBufferSize:  1024,
+		WriteBufferSize: 1024,
+		CheckOrigin: func(r *http.Request) bool {
+			// we fully expect cors requests (via something like pinafore.social) so we should be lenient here
+			return true
+		},
+	}
+
+	// do the actual upgrade here
+	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
+	if err != nil {
+		l.Infof("error upgrading websocket connection: %s", err)
+		return
+	}
+	defer conn.Close() // whatever happens, when we leave this function we want to close the websocket connection
+
+	// inform the processor that we have a new connection and want a stream for it
+	stream, errWithCode := m.processor.OpenStreamForAccount(account, streamType)
+	if errWithCode != nil {
+		c.JSON(errWithCode.Code(), errWithCode.Safe())
+		return
+	}
+	defer close(stream.Hangup) // closing stream.Hangup indicates that we've finished with the connection (the client has gone), so we want to do this on exiting this handler
+
+	// spawn a new ticker for pinging the connection periodically
+	t := time.NewTicker(30 * time.Second)
+
+	// we want to stay in the sendloop as long as possible while the client is connected -- the only thing that should break the loop is if the client leaves or something else goes wrong
+sendLoop:
+	for {
+		select {
+		case m := <-stream.Messages:
+			// we've got a streaming message!!
+			l.Debug("received message from stream")
+			if err := conn.WriteJSON(m); err != nil {
+				l.Infof("error writing json to websocket connection: %s", err)
+				// if something is wrong we want to bail and drop the connection -- the client will create a new one
+				break sendLoop
+			}
+			l.Debug("wrote message into websocket connection")
+		case <-t.C:
+			l.Debug("received TICK from ticker")
+			if err := conn.WriteMessage(websocket.PingMessage, []byte(": ping")); err != nil {
+				l.Infof("error writing ping to websocket connection: %s", err)
+				// if something is wrong we want to bail and drop the connection -- the client will create a new one
+				break sendLoop
+			}
+			l.Debug("wrote ping message into websocket connection")
+		}
+	}
+
+	l.Debug("leaving StreamGETHandler")
+}

internal/api/client/streaming/streaming.go

@@ -0,0 +1,62 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package streaming
+
+import (
+	"net/http"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/processing"
+	"github.com/superseriousbusiness/gotosocial/internal/router"
+)
+
+const (
+	// BasePath is the path for the streaming api
+	BasePath = "/api/v1/streaming"
+
+	// StreamQueryKey is the query key for the type of stream being requested
+	StreamQueryKey = "stream"
+
+	// AccessTokenQueryKey is the query key for an oauth access token that should be passed in streaming requests.
+	AccessTokenQueryKey = "access_token"
+)
+
+// Module implements the api.ClientModule interface for everything related to streaming
+type Module struct {
+	config    *config.Config
+	processor processing.Processor
+	log       *logrus.Logger
+}
+
+// New returns a new streaming module
+func New(config *config.Config, processor processing.Processor, log *logrus.Logger) api.ClientModule {
+	return &Module{
+		config:    config,
+		processor: processor,
+		log:       log,
+	}
+}
+
+// Route attaches all routes from this module to the given router
+func (m *Module) Route(r router.Router) error {
+	r.AttachHandler(http.MethodGet, BasePath, m.StreamGETHandler)
+	return nil
+}

internal/cliactions/server/server.go

@@ -24,6 +24,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/notification"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/search"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/status"
+	"github.com/superseriousbusiness/gotosocial/internal/api/client/streaming"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/timeline"
 	"github.com/superseriousbusiness/gotosocial/internal/api/s2s/user"
 	"github.com/superseriousbusiness/gotosocial/internal/api/s2s/webfinger"
@@ -134,6 +135,7 @@ var Start cliactions.GTSAction = func(ctx context.Context, c *config.Config, log
 	adminModule := admin.New(c, processor, log)
 	statusModule := status.New(c, processor, log)
 	securityModule := security.New(c, log)
+	streamingModule := streaming.New(c, processor, log)
 
 	apis := []api.ClientModule{
 		// modules with middleware go first
@@ -157,6 +159,7 @@ var Start cliactions.GTSAction = func(ctx context.Context, c *config.Config, log
 		filtersModule,
 		emojiModule,
 		listsModule,
+		streamingModule,
 	}
 
 	for _, m := range apis {

internal/db/pg/pg.go

@@ -975,6 +975,7 @@ func (ps *postgresService) GetPublicTimelineForAccount(accountID string, maxID s
 	q := ps.conn.Model(&statuses).
 		Where("visibility = ?", gtsmodel.VisibilityPublic).
 		Where("? IS NULL", pg.Ident("in_reply_to_id")).
+		Where("? IS NULL", pg.Ident("in_reply_to_uri")).
 		Where("? IS NULL", pg.Ident("boost_of_id")).
 		Order("status.id DESC")
 

internal/gtsmodel/stream.go

@@ -0,0 +1,38 @@
+package gtsmodel
+
+import "sync"
+
+// StreamsForAccount is a wrapper for the multiple streams that one account can have running at the same time.
+// TODO: put a limit on this
+type StreamsForAccount struct {
+	// The currently held streams for this account
+	Streams []*Stream
+	// Mutex to lock/unlock when modifying the slice of streams.
+	sync.Mutex
+}
+
+// Stream represents one open stream for a client.
+type Stream struct {
+	// ID of this stream, generated during creation.
+	ID string
+	// Type of this stream: user/public/etc
+	Type string
+	// Channel of messages for the client to read from
+	Messages chan *Message
+	// Channel to close when the client drops away
+	Hangup chan interface{}
+	// Only put messages in the stream when Connected
+	Connected bool
+	// Mutex to lock/unlock when inserting messages, hanging up, changing the connected state etc.
+	sync.Mutex
+}
+
+// Message represents one streamed message.
+type Message struct {
+	// All the stream types this message should be delivered to.
+	Stream []string `json:"stream"`
+	// The event type of the message (update/delete/notification etc)
+	Event string `json:"event"`
+	// The actual payload of the message. In case of an update or notification, this will be a JSON string.
+	Payload string `json:"payload"`
+}

internal/oauth/server.go

@@ -56,6 +56,7 @@ type Server interface {
 	HandleAuthorizeRequest(w http.ResponseWriter, r *http.Request) error
 	ValidationBearerToken(r *http.Request) (oauth2.TokenInfo, error)
 	GenerateUserAccessToken(ti oauth2.TokenInfo, clientSecret string, userID string) (accessToken oauth2.TokenInfo, err error)
+	LoadAccessToken(ctx context.Context, access string) (accessToken oauth2.TokenInfo, err error)
 }
 
 // s fulfils the Server interface using the underlying oauth2 server
@@ -171,3 +172,7 @@ func (s *s) GenerateUserAccessToken(ti oauth2.TokenInfo, clientSecret string, us
 	s.log.Tracef("obtained user-level access token: %+v", accessToken)
 	return accessToken, nil
 }
+
+func (s *s) LoadAccessToken(ctx context.Context, access string) (accessToken oauth2.TokenInfo, err error) {
+	return s.server.Manager.LoadAccessToken(ctx, access)
+}

internal/processing/fromcommon.go

@@ -96,6 +96,16 @@ func (p *processor) notifyStatus(status *gtsmodel.Status) error {
 		if err := p.db.Put(notif); err != nil {
 			return fmt.Errorf("notifyStatus: error putting notification in database: %s", err)
 		}
+
+		// now stream the notification to the user
+		mastoNotif, err := p.tc.NotificationToMasto(notif)
+		if err != nil {
+			return fmt.Errorf("notifyStatus: error converting notification to masto representation: %s", err)
+		}
+
+		if err := p.streamingProcessor.StreamNotificationToAccount(mastoNotif, m.GTSAccount); err != nil {
+			return fmt.Errorf("notifyStatus: error streaming notification to account: %s", err)
+		}
 	}
 
 	return nil
@@ -123,6 +133,16 @@ func (p *processor) notifyFollowRequest(followRequest *gtsmodel.FollowRequest, r
 		return fmt.Errorf("notifyFollowRequest: error putting notification in database: %s", err)
 	}
 
+	// now stream the notification to the user
+	mastoNotif, err := p.tc.NotificationToMasto(notif)
+	if err != nil {
+		return fmt.Errorf("notifyStatus: error converting notification to masto representation: %s", err)
+	}
+
+	if err := p.streamingProcessor.StreamNotificationToAccount(mastoNotif, receivingAccount); err != nil {
+		return fmt.Errorf("notifyStatus: error streaming notification to account: %s", err)
+	}
+
 	return nil
 }
 
@@ -157,6 +177,16 @@ func (p *processor) notifyFollow(follow *gtsmodel.Follow, receivingAccount *gtsm
 		return fmt.Errorf("notifyFollow: error putting notification in database: %s", err)
 	}
 
+	// now stream the notification to the user
+	mastoNotif, err := p.tc.NotificationToMasto(notif)
+	if err != nil {
+		return fmt.Errorf("notifyStatus: error converting notification to masto representation: %s", err)
+	}
+
+	if err := p.streamingProcessor.StreamNotificationToAccount(mastoNotif, receivingAccount); err != nil {
+		return fmt.Errorf("notifyStatus: error streaming notification to account: %s", err)
+	}
+
 	return nil
 }
 
@@ -183,6 +213,16 @@ func (p *processor) notifyFave(fave *gtsmodel.StatusFave, receivingAccount *gtsm
 		return fmt.Errorf("notifyFave: error putting notification in database: %s", err)
 	}
 
+	// now stream the notification to the user
+	mastoNotif, err := p.tc.NotificationToMasto(notif)
+	if err != nil {
+		return fmt.Errorf("notifyStatus: error converting notification to masto representation: %s", err)
+	}
+
+	if err := p.streamingProcessor.StreamNotificationToAccount(mastoNotif, receivingAccount); err != nil {
+		return fmt.Errorf("notifyStatus: error streaming notification to account: %s", err)
+	}
+
 	return nil
 }
 
@@ -242,6 +282,16 @@ func (p *processor) notifyAnnounce(status *gtsmodel.Status) error {
 		return fmt.Errorf("notifyAnnounce: error putting notification in database: %s", err)
 	}
 
+	// now stream the notification to the user
+	mastoNotif, err := p.tc.NotificationToMasto(notif)
+	if err != nil {
+		return fmt.Errorf("notifyStatus: error converting notification to masto representation: %s", err)
+	}
+
+	if err := p.streamingProcessor.StreamNotificationToAccount(mastoNotif, boostedAcct); err != nil {
+		return fmt.Errorf("notifyStatus: error streaming notification to account: %s", err)
+	}
+
 	return nil
 }
 
@@ -321,8 +371,32 @@ func (p *processor) timelineStatusForAccount(status *gtsmodel.Status, accountID
 		return
 	}
 
-	if err := p.timelineManager.IngestAndPrepare(status, timelineAccount.ID); err != nil {
+	// stick the status in the timeline for the account and then immediately prepare it so they can see it right away
+	inserted, err := p.timelineManager.IngestAndPrepare(status, timelineAccount.ID)
+	if err != nil {
 		errors <- fmt.Errorf("timelineStatusForAccount: error ingesting status %s: %s", status.ID, err)
+		return
+	}
+
+	// the status was inserted to stream it to the user
+	if inserted {
+		mastoStatus, err := p.tc.StatusToMasto(status, timelineAccount)
+		if err != nil {
+			errors <- fmt.Errorf("timelineStatusForAccount: error converting status %s to frontend representation: %s", status.ID, err)
+		} else {
+			if err := p.streamingProcessor.StreamStatusToAccount(mastoStatus, timelineAccount); err != nil {
+				errors <- fmt.Errorf("timelineStatusForAccount: error streaming status %s: %s", status.ID, err)
+			}
+		}
+	}
+
+	mastoStatus, err := p.tc.StatusToMasto(status, timelineAccount)
+	if err != nil {
+		errors <- fmt.Errorf("timelineStatusForAccount: error converting status %s to frontend representation: %s", status.ID, err)
+	} else {
+		if err := p.streamingProcessor.StreamStatusToAccount(mastoStatus, timelineAccount); err != nil {
+			errors <- fmt.Errorf("timelineStatusForAccount: error streaming status %s: %s", status.ID, err)
+		}
 	}
 }
 

internal/processing/processor.go

@@ -33,6 +33,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/media"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 	"github.com/superseriousbusiness/gotosocial/internal/processing/synchronous/status"
+	"github.com/superseriousbusiness/gotosocial/internal/processing/synchronous/streaming"
 	"github.com/superseriousbusiness/gotosocial/internal/timeline"
 	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
 	"github.com/superseriousbusiness/gotosocial/internal/visibility"
@@ -132,6 +133,11 @@ type Processor interface {
 	// PublicTimelineGet returns statuses from the public/local timeline, with the given filters/parameters.
 	PublicTimelineGet(authed *oauth.Auth, maxID string, sinceID string, minID string, limit int, local bool) ([]*apimodel.Status, gtserror.WithCode)
 
+	// AuthorizeStreamingRequest returns a gotosocial account in exchange for an access token, or an error if the given token is not valid.
+	AuthorizeStreamingRequest(accessToken string) (*gtsmodel.Account, error)
+	// OpenStreamForAccount opens a new stream for the given account, with the given stream type.
+	OpenStreamForAccount(account *gtsmodel.Account, streamType string) (*gtsmodel.Stream, gtserror.WithCode)
+
 	/*
 		FEDERATION API-FACING PROCESSING FUNCTIONS
 		These functions are intended to be called when the federating client needs an immediate (ie., synchronous) reply
@@ -192,7 +198,8 @@ type processor struct {
 		SUB-PROCESSORS
 	*/
 
-	statusProcessor status.Processor
+	statusProcessor    status.Processor
+	streamingProcessor streaming.Processor
 }
 
 // NewProcessor returns a new Processor that uses the given federator and logger
@@ -202,6 +209,7 @@ func NewProcessor(config *config.Config, tc typeutils.TypeConverter, federator f
 	fromFederator := make(chan gtsmodel.FromFederator, 1000)
 
 	statusProcessor := status.New(db, tc, config, fromClientAPI, log)
+	streamingProcessor := streaming.New(db, tc, oauthServer, config, log)
 
 	return &processor{
 		fromClientAPI:   fromClientAPI,
@@ -218,7 +226,8 @@ func NewProcessor(config *config.Config, tc typeutils.TypeConverter, federator f
 		db:              db,
 		filter:          visibility.NewFilter(db, log),
 
-		statusProcessor: statusProcessor,
+		statusProcessor:    statusProcessor,
+		streamingProcessor: streamingProcessor,
 	}
 }
 

internal/processing/streaming.go

@@ -0,0 +1,14 @@
+package processing
+
+import (
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) AuthorizeStreamingRequest(accessToken string) (*gtsmodel.Account, error) {
+	return p.streamingProcessor.AuthorizeStreamingRequest(accessToken)
+}
+
+func (p *processor) OpenStreamForAccount(account *gtsmodel.Account, streamType string) (*gtsmodel.Stream, gtserror.WithCode) {
+	return p.streamingProcessor.OpenStreamForAccount(account, streamType)
+}

internal/processing/synchronous/streaming/authorize.go

@@ -0,0 +1,33 @@
+package streaming
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) AuthorizeStreamingRequest(accessToken string) (*gtsmodel.Account, error) {
+	ti, err := p.oauthServer.LoadAccessToken(context.Background(), accessToken)
+	if err != nil {
+		return nil, fmt.Errorf("AuthorizeStreamingRequest: error loading access token: %s", err)
+	}
+
+	uid := ti.GetUserID()
+	if uid == "" {
+		return nil, fmt.Errorf("AuthorizeStreamingRequest: no userid in token")
+	}
+
+	// fetch user's and account for this user id
+	user := &gtsmodel.User{}
+	if err := p.db.GetByID(uid, user); err != nil || user == nil {
+		return nil, fmt.Errorf("AuthorizeStreamingRequest: no user found for validated uid %s", uid)
+	}
+
+	acct := &gtsmodel.Account{}
+	if err := p.db.GetByID(user.AccountID, acct); err != nil || acct == nil {
+		return nil, fmt.Errorf("AuthorizeStreamingRequest: no account retrieved for user with id %s", uid)
+	}
+
+	return acct, nil
+}

internal/processing/synchronous/streaming/openstream.go

@@ -0,0 +1,100 @@
+package streaming
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/id"
+)
+
+func (p *processor) OpenStreamForAccount(account *gtsmodel.Account, streamType string) (*gtsmodel.Stream, gtserror.WithCode) {
+	l := p.log.WithFields(logrus.Fields{
+		"func":       "OpenStreamForAccount",
+		"account":    account.ID,
+		"streamType": streamType,
+	})
+	l.Debug("received open stream request")
+
+	// each stream needs a unique ID so we know to close it
+	streamID, err := id.NewRandomULID()
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error generating stream id: %s", err))
+	}
+
+	thisStream := &gtsmodel.Stream{
+		ID:        streamID,
+		Type:      streamType,
+		Messages:  make(chan *gtsmodel.Message, 100),
+		Hangup:    make(chan interface{}, 1),
+		Connected: true,
+	}
+	go p.waitToCloseStream(account, thisStream)
+
+	v, ok := p.streamMap.Load(account.ID)
+	if !ok || v == nil {
+		// there is no entry in the streamMap for this account yet, so make one and store it
+		streamsForAccount := &gtsmodel.StreamsForAccount{
+			Streams: []*gtsmodel.Stream{
+				thisStream,
+			},
+		}
+		p.streamMap.Store(account.ID, streamsForAccount)
+	} else {
+		// there is an entry in the streamMap for this account
+		// parse the interface as a streamsForAccount
+		streamsForAccount, ok := v.(*gtsmodel.StreamsForAccount)
+		if !ok {
+			return nil, gtserror.NewErrorInternalError(errors.New("stream map error"))
+		}
+
+		// append this stream to it
+		streamsForAccount.Lock()
+		streamsForAccount.Streams = append(streamsForAccount.Streams, thisStream)
+		streamsForAccount.Unlock()
+	}
+
+	return thisStream, nil
+}
+
+// waitToCloseStream waits until the hangup channel is closed for the given stream.
+// It then iterates through the map of streams stored by the processor, removes the stream from it,
+// and then closes the messages channel of the stream to indicate that the channel should no longer be read from.
+func (p *processor) waitToCloseStream(account *gtsmodel.Account, thisStream *gtsmodel.Stream) {
+	<-thisStream.Hangup // wait for a hangup message
+
+	// lock the stream to prevent more messages being put in it while we work
+	thisStream.Lock()
+	defer thisStream.Unlock()
+
+	// indicate the stream is no longer connected
+	thisStream.Connected = false
+
+	// load and parse the entry for this account from the stream map
+	v, ok := p.streamMap.Load(account.ID)
+	if !ok || v == nil {
+		return
+	}
+	streamsForAccount, ok := v.(*gtsmodel.StreamsForAccount)
+	if !ok {
+		return
+	}
+
+	// lock the streams for account while we remove this stream from its slice
+	streamsForAccount.Lock()
+	defer streamsForAccount.Unlock()
+
+	// put everything into modified streams *except* the stream we're removing
+	modifiedStreams := []*gtsmodel.Stream{}
+	for _, s := range streamsForAccount.Streams {
+		if s.ID != thisStream.ID {
+			modifiedStreams = append(modifiedStreams, s)
+		}
+	}
+	streamsForAccount.Streams = modifiedStreams
+
+	// finally close the messages channel so no more messages can be read from it
+	close(thisStream.Messages)
+}

internal/processing/synchronous/streaming/streaming.go

@@ -0,0 +1,47 @@
+package streaming
+
+import (
+	"sync"
+
+	"github.com/sirupsen/logrus"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+	"github.com/superseriousbusiness/gotosocial/internal/visibility"
+)
+
+// Processor wraps a bunch of functions for processing streaming.
+type Processor interface {
+	// AuthorizeStreamingRequest returns an oauth2 token info in response to an access token query from the streaming API
+	AuthorizeStreamingRequest(accessToken string) (*gtsmodel.Account, error)
+	OpenStreamForAccount(account *gtsmodel.Account, streamType string) (*gtsmodel.Stream, gtserror.WithCode)
+	StreamStatusToAccount(s *apimodel.Status, account *gtsmodel.Account) error
+	StreamNotificationToAccount(n *apimodel.Notification, account *gtsmodel.Account) error
+}
+
+type processor struct {
+	tc          typeutils.TypeConverter
+	config      *config.Config
+	db          db.DB
+	filter      visibility.Filter
+	log         *logrus.Logger
+	oauthServer oauth.Server
+	streamMap   *sync.Map
+}
+
+// New returns a new status processor.
+func New(db db.DB, tc typeutils.TypeConverter, oauthServer oauth.Server, config *config.Config, log *logrus.Logger) Processor {
+	return &processor{
+		tc:          tc,
+		config:      config,
+		db:          db,
+		filter:      visibility.NewFilter(db, log),
+		log:         log,
+		oauthServer: oauthServer,
+		streamMap:   &sync.Map{},
+	}
+}

internal/processing/synchronous/streaming/streamnotification.go

@@ -0,0 +1,50 @@
+package streaming
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) StreamNotificationToAccount(n *apimodel.Notification, account *gtsmodel.Account) error {
+	l := p.log.WithFields(logrus.Fields{
+		"func":    "StreamNotificationToAccount",
+		"account": account.ID,
+	})
+	v, ok := p.streamMap.Load(account.ID)
+	if !ok {
+		// no open connections so nothing to stream
+		return nil
+	}
+
+	streamsForAccount, ok := v.(*gtsmodel.StreamsForAccount)
+	if !ok {
+		return errors.New("stream map error")
+	}
+
+	notificationBytes, err := json.Marshal(n)
+	if err != nil {
+		return fmt.Errorf("error marshalling notification to json: %s", err)
+	}
+
+	streamsForAccount.Lock()
+	defer streamsForAccount.Unlock()
+	for _, stream := range streamsForAccount.Streams {
+		stream.Lock()
+		defer stream.Unlock()
+		if stream.Connected {
+			l.Debugf("streaming notification to stream id %s", stream.ID)
+			stream.Messages <- &gtsmodel.Message{
+				Stream:  []string{stream.Type},
+				Event:   "notification",
+				Payload: string(notificationBytes),
+			}
+		}
+	}
+
+	return nil
+}

internal/processing/synchronous/streaming/streamstatus.go

@@ -0,0 +1,50 @@
+package streaming
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) StreamStatusToAccount(s *apimodel.Status, account *gtsmodel.Account) error {
+	l := p.log.WithFields(logrus.Fields{
+		"func":    "StreamStatusForAccount",
+		"account": account.ID,
+	})
+	v, ok := p.streamMap.Load(account.ID)
+	if !ok {
+		// no open connections so nothing to stream
+		return nil
+	}
+
+	streamsForAccount, ok := v.(*gtsmodel.StreamsForAccount)
+	if !ok {
+		return errors.New("stream map error")
+	}
+
+	statusBytes, err := json.Marshal(s)
+	if err != nil {
+		return fmt.Errorf("error marshalling status to json: %s", err)
+	}
+
+	streamsForAccount.Lock()
+	defer streamsForAccount.Unlock()
+	for _, stream := range streamsForAccount.Streams {
+		stream.Lock()
+		defer stream.Unlock()
+		if stream.Connected {
+			l.Debugf("streaming status to stream id %s", stream.ID)
+			stream.Messages <- &gtsmodel.Message{
+				Stream:  []string{stream.Type},
+				Event:   "update",
+				Payload: string(statusBytes),
+			}
+		}
+	}
+
+	return nil
+}

internal/processing/timeline.go

@@ -201,7 +201,7 @@ func (p *processor) indexAndIngest(statuses []*gtsmodel.Status, timelineAccount
 			continue
 		}
 		if timelineable {
-			if err := p.timelineManager.Ingest(s, timelineAccount.ID); err != nil {
+			if _, err := p.timelineManager.Ingest(s, timelineAccount.ID); err != nil {
 				l.Error(fmt.Errorf("initTimelineFor: error ingesting status %s: %s", s.ID, err))
 				continue
 			}

internal/router/router.go

@@ -128,9 +128,9 @@ func New(config *config.Config, logger *logrus.Logger) (Router, error) {
 		AllowAllOrigins:        true,
 		AllowBrowserExtensions: true,
 		AllowMethods:           []string{"POST", "PUT", "DELETE", "GET", "PATCH", "OPTIONS"},
-		AllowHeaders:           []string{"Origin", "Content-Length", "Content-Type", "Authorization"},
+		AllowHeaders:           []string{"Origin", "Content-Length", "Content-Type", "Authorization", "Upgrade", "Sec-WebSocket-Extensions", "Sec-WebSocket-Key", "Sec-WebSocket-Protocol", "Sec-WebSocket-Version", "Connection"},
 		AllowWebSockets:        true,
-		ExposeHeaders:          []string{"Link", "X-RateLimit-Reset", "X-RateLimit-Limit", " X-RateLimit-Remaining", "X-Request-Id"},
+		ExposeHeaders:          []string{"Link", "X-RateLimit-Reset", "X-RateLimit-Limit", " X-RateLimit-Remaining", "X-Request-Id", "Connection", "Sec-WebSocket-Accept", "Upgrade"},
 		MaxAge:                 2 * time.Minute,
 	}))
 	engine.MaxMultipartMemory = 8 << 20 // 8 MiB

internal/timeline/index.go

@@ -40,7 +40,7 @@ grabloop:
 	}
 
 	for _, s := range filtered {
-		if err := t.IndexOne(s.CreatedAt, s.ID, s.BoostOfID); err != nil {
+		if _, err := t.IndexOne(s.CreatedAt, s.ID, s.BoostOfID); err != nil {
 			return fmt.Errorf("IndexBehindAndIncluding: error indexing status with id %s: %s", s.ID, err)
 		}
 	}
@@ -52,7 +52,7 @@ func (t *timeline) IndexOneByID(statusID string) error {
 	return nil
 }
 
-func (t *timeline) IndexOne(statusCreatedAt time.Time, statusID string, boostOfID string) error {
+func (t *timeline) IndexOne(statusCreatedAt time.Time, statusID string, boostOfID string) (bool, error) {
 	t.Lock()
 	defer t.Unlock()
 
@@ -64,7 +64,7 @@ func (t *timeline) IndexOne(statusCreatedAt time.Time, statusID string, boostOfI
 	return t.postIndex.insertIndexed(postIndexEntry)
 }
 
-func (t *timeline) IndexAndPrepareOne(statusCreatedAt time.Time, statusID string) error {
+func (t *timeline) IndexAndPrepareOne(statusCreatedAt time.Time, statusID string) (bool, error) {
 	t.Lock()
 	defer t.Unlock()
 
@@ -72,15 +72,18 @@ func (t *timeline) IndexAndPrepareOne(statusCreatedAt time.Time, statusID string
 		statusID: statusID,
 	}
 
-	if err := t.postIndex.insertIndexed(postIndexEntry); err != nil {
-		return fmt.Errorf("IndexAndPrepareOne: error inserting indexed: %s", err)
+	inserted, err := t.postIndex.insertIndexed(postIndexEntry)
+	if err != nil {
+		return inserted, fmt.Errorf("IndexAndPrepareOne: error inserting indexed: %s", err)
 	}
 
-	if err := t.prepare(statusID); err != nil {
-		return fmt.Errorf("IndexAndPrepareOne: error preparing: %s", err)
+	if inserted {
+		if err := t.prepare(statusID); err != nil {
+			return inserted, fmt.Errorf("IndexAndPrepareOne: error preparing: %s", err)
+		}
 	}
 
-	return nil
+	return inserted, nil
 }
 
 func (t *timeline) OldestIndexedPostID() (string, error) {

internal/timeline/manager.go

@@ -51,12 +51,18 @@ type Manager interface {
 	// Ingest takes one status and indexes it into the timeline for the given account ID.
 	//
 	// It should already be established before calling this function that the status/post actually belongs in the timeline!
-	Ingest(status *gtsmodel.Status, timelineAccountID string) error
+	//
+	// The returned bool indicates whether the status was actually put in the timeline. This could be false in cases where
+	// the status is a boost, but a boost of the original post or the post itself already exists recently in the timeline.
+	Ingest(status *gtsmodel.Status, timelineAccountID string) (bool, error)
 	// IngestAndPrepare takes one status and indexes it into the timeline for the given account ID, and then immediately prepares it for serving.
 	// This is useful in cases where we know the status will need to be shown at the top of a user's timeline immediately (eg., a new status is created).
 	//
 	// It should already be established before calling this function that the status/post actually belongs in the timeline!
-	IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) error
+	//
+	// The returned bool indicates whether the status was actually put in the timeline. This could be false in cases where
+	// the status is a boost, but a boost of the original post or the post itself already exists recently in the timeline.
+	IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) (bool, error)
 	// HomeTimeline returns limit n amount of entries from the home timeline of the given account ID, in descending chronological order.
 	// If maxID is provided, it will return entries from that maxID onwards, inclusive.
 	HomeTimeline(accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*apimodel.Status, error)
@@ -95,7 +101,7 @@ type manager struct {
 	log              *logrus.Logger
 }
 
-func (m *manager) Ingest(status *gtsmodel.Status, timelineAccountID string) error {
+func (m *manager) Ingest(status *gtsmodel.Status, timelineAccountID string) (bool, error) {
 	l := m.log.WithFields(logrus.Fields{
 		"func":              "Ingest",
 		"timelineAccountID": timelineAccountID,
@@ -108,7 +114,7 @@ func (m *manager) Ingest(status *gtsmodel.Status, timelineAccountID string) erro
 	return t.IndexOne(status.CreatedAt, status.ID, status.BoostOfID)
 }
 
-func (m *manager) IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) error {
+func (m *manager) IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) (bool, error) {
 	l := m.log.WithFields(logrus.Fields{
 		"func":              "IngestAndPrepare",
 		"timelineAccountID": timelineAccountID,

internal/timeline/postindex.go

@@ -14,7 +14,7 @@ type postIndexEntry struct {
 	boostOfID string
 }
 
-func (p *postIndex) insertIndexed(i *postIndexEntry) error {
+func (p *postIndex) insertIndexed(i *postIndexEntry) (bool, error) {
 	if p.data == nil {
 		p.data = &list.List{}
 	}
@@ -22,7 +22,7 @@ func (p *postIndex) insertIndexed(i *postIndexEntry) error {
 	// if we have no entries yet, this is both the newest and oldest entry, so just put it in the front
 	if p.data.Len() == 0 {
 		p.data.PushFront(i)
-		return nil
+		return true, nil
 	}
 
 	var insertMark *list.Element
@@ -34,14 +34,14 @@ func (p *postIndex) insertIndexed(i *postIndexEntry) error {
 
 		entry, ok := e.Value.(*postIndexEntry)
 		if !ok {
-			return errors.New("index: could not parse e as a postIndexEntry")
+			return false, errors.New("index: could not parse e as a postIndexEntry")
 		}
 
 		// don't insert this if it's a boost of a status we've seen recently
 		if i.boostOfID != "" {
 			if i.boostOfID == entry.boostOfID || i.boostOfID == entry.statusID {
 				if position < boostReinsertionDepth {
-					return nil
+					return false, nil
 				}
 			}
 		}
@@ -55,16 +55,16 @@ func (p *postIndex) insertIndexed(i *postIndexEntry) error {
 
 		// make sure we don't insert a duplicate
 		if entry.statusID == i.statusID {
-			return nil
+			return false, nil
 		}
 	}
 
 	if insertMark != nil {
 		p.data.InsertBefore(i, insertMark)
-		return nil
+		return true, nil
 	}
 
 	// if we reach this point it's the oldest post we've seen so put it at the back
 	p.data.PushBack(i)
-	return nil
+	return true, nil
 }

internal/timeline/timeline.go

@@ -62,7 +62,10 @@ type Timeline interface {
 	*/
 
 	// IndexOne puts a status into the timeline at the appropriate place according to its 'createdAt' property.
-	IndexOne(statusCreatedAt time.Time, statusID string, boostOfID string) error
+	//
+	// The returned bool indicates whether or not the status was actually inserted into the timeline. This will be false
+	// if the status is a boost and the original post or another boost of it already exists < boostReinsertionDepth back in the timeline.
+	IndexOne(statusCreatedAt time.Time, statusID string, boostOfID string) (bool, error)
 
 	// OldestIndexedPostID returns the id of the rearmost (ie., the oldest) indexed post, or an error if something goes wrong.
 	// If nothing goes wrong but there's no oldest post, an empty string will be returned so make sure to check for this.
@@ -79,7 +82,10 @@ type Timeline interface {
 	PrepareBehind(statusID string, amount int) error
 	// IndexOne puts a status into the timeline at the appropriate place according to its 'createdAt' property,
 	// and then immediately prepares it.
-	IndexAndPrepareOne(statusCreatedAt time.Time, statusID string) error
+	//
+	// The returned bool indicates whether or not the status was actually inserted into the timeline. This will be false
+	// if the status is a boost and the original post or another boost of it already exists < boostReinsertionDepth back in the timeline.
+	IndexAndPrepareOne(statusCreatedAt time.Time, statusID string) (bool, error)
 	// OldestPreparedPostID returns the id of the rearmost (ie., the oldest) prepared post, or an error if something goes wrong.
 	// If nothing goes wrong but there's no oldest post, an empty string will be returned so make sure to check for this.
 	OldestPreparedPostID() (string, error)