gotosocial/internal/api/client/streaming/stream.go
tobi b6fbdc66c1
[chore] Deinterface processor and subprocessors (#1501)
* [chore] Deinterface processor and subprocessors

* expose subprocessors via function calls

* missing license header
2023-02-22 16:05:26 +01:00

266 lines
8.5 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2023 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 (
"context"
"errors"
"fmt"
"time"
"codeberg.org/gruf/go-kv"
apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
)
// StreamGETHandler swagger:operation GET /api/v1/streaming streamGet
//
// Initiate a websocket connection for live streaming of statuses and notifications.
//
// The scheme used should *always* be `wss`. The streaming basepath can be viewed at `/api/v1/instance`.
//
// On a successful connection, a code `101` will be returned, which indicates that the connection is being upgraded to a secure websocket connection.
//
// As long as the connection is open, various message types will be streamed into it.
//
// GoToSocial will ping the connection every 30 seconds to check whether the client is still receiving.
//
// If the ping fails, or something else goes wrong during transmission, then the connection will be dropped, and the client will be expected to start it again.
//
// ---
// tags:
// - streaming
//
// produces:
// - application/json
//
// schemes:
// - wss
//
// parameters:
// -
// name: access_token
// type: string
// description: Access token for the requesting account.
// in: query
// required: true
// -
// name: stream
// type: string
// description: |-
// Type of stream to request.
//
// Options are:
//
// `user`: receive updates for the account's home timeline.
// `public`: receive updates for the public timeline.
// `public:local`: receive updates for the local timeline.
// `hashtag`: receive updates for a given hashtag.
// `hashtag:local`: receive local updates for a given hashtag.
// `list`: receive updates for a certain list of accounts.
// `direct`: receive updates for direct messages.
// in: query
// required: true
//
// security:
// - OAuth2 Bearer:
// - read:streaming
//
// responses:
// '101':
// schema:
// type: object
// properties:
// stream:
// type: array
// items:
// type: string
// enum:
// - user
// - public
// - public:local
// - hashtag
// - hashtag:local
// - list
// - direct
// event:
// description: |-
// The type of event being received.
//
// `update`: a new status has been received.
// `notification`: a new notification has been received.
// `delete`: a status has been deleted.
// `filters_changed`: not implemented.
// type: string
// enum:
// - update
// - notification
// - delete
// - filters_changed
// payload:
// description: |-
// The payload of the streamed message.
// Different depending on the `event` type.
//
// If present, it should be parsed as a string.
//
// If `event` = `update`, then the payload will be a JSON string of a status.
// If `event` = `notification`, then the payload will be a JSON string of a notification.
// If `event` = `delete`, then the payload will be a status ID.
// type: string
// example: "{\"id\":\"01FC3TZ5CFG6H65GCKCJRKA669\",\"created_at\":\"2021-08-02T16:25:52Z\",\"sensitive\":false,\"spoiler_text\":\"\",\"visibility\":\"public\",\"language\":\"en\",\"uri\":\"https://gts.superseriousbusiness.org/users/dumpsterqueer/statuses/01FC3TZ5CFG6H65GCKCJRKA669\",\"url\":\"https://gts.superseriousbusiness.org/@dumpsterqueer/statuses/01FC3TZ5CFG6H65GCKCJRKA669\",\"replies_count\":0,\"reblogs_count\":0,\"favourites_count\":0,\"favourited\":false,\"reblogged\":false,\"muted\":false,\"bookmarked\":fals…//gts.superseriousbusiness.org/fileserver/01JNN207W98SGG3CBJ76R5MVDN/header/original/019036W043D8FXPJKSKCX7G965.png\",\"header_static\":\"https://gts.superseriousbusiness.org/fileserver/01JNN207W98SGG3CBJ76R5MVDN/header/small/019036W043D8FXPJKSKCX7G965.png\",\"followers_count\":33,\"following_count\":28,\"statuses_count\":126,\"last_status_at\":\"2021-08-02T16:25:52Z\",\"emojis\":[],\"fields\":[]},\"media_attachments\":[],\"mentions\":[],\"tags\":[],\"emojis\":[],\"card\":null,\"poll\":null,\"text\":\"a\"}"
// '401':
// description: unauthorized
// '400':
// description: bad request
func (m *Module) StreamGETHandler(c *gin.Context) {
streamType := c.Query(StreamQueryKey)
if streamType == "" {
err := fmt.Errorf("no stream type provided under query key %s", StreamQueryKey)
apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
return
}
var token string
// First we check for a query param provided access token
if token = c.Query(AccessTokenQueryKey); token == "" {
// Else we check the HTTP header provided token
if token = c.GetHeader(AccessTokenHeader); token == "" {
const errStr = "no access token provided"
err := gtserror.NewErrorUnauthorized(errors.New(errStr), errStr)
apiutil.ErrorHandler(c, err, m.processor.InstanceGetV1)
return
}
}
account, errWithCode := m.processor.Stream().Authorize(c.Request.Context(), token)
if errWithCode != nil {
apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
return
}
stream, errWithCode := m.processor.Stream().Open(c.Request.Context(), account, streamType)
if errWithCode != nil {
apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
return
}
l := log.WithContext(c.Request.Context()).
WithFields(kv.Fields{
{"account", account.Username},
{"streamID", stream.ID},
{"streamType", streamType},
}...)
// Upgrade the incoming HTTP request, which hijacks the underlying
// connection and reuses it for the websocket (non-http) protocol.
wsConn, err := m.wsUpgrade.Upgrade(c.Writer, c.Request, nil)
if err != nil {
l.Errorf("error upgrading websocket connection: %v", err)
close(stream.Hangup)
return
}
go func() {
// We perform the main websocket send loop in a separate
// goroutine in order to let the upgrade handler return.
// This prevents the upgrade handler from holding open any
// throttle / rate-limit request tokens which could become
// problematic on instances with multiple users.
l.Info("opened websocket connection")
defer l.Info("closed websocket connection")
// Create new context for lifetime of the connection
ctx, cncl := context.WithCancel(context.Background())
// Create ticker to send alive pings
pinger := time.NewTicker(m.dTicker)
defer func() {
// Signal done
cncl()
// Close websocket conn
_ = wsConn.Close()
// Close processor stream
close(stream.Hangup)
// Stop ping ticker
pinger.Stop()
}()
go func() {
// Signal done
defer cncl()
for {
// We have to listen for received websocket messages in
// order to trigger the underlying wsConn.PingHandler().
//
// So we wait on received messages but only act on errors.
_, _, err := wsConn.ReadMessage()
if err != nil {
if ctx.Err() == nil {
// Only log error if the connection was not closed
// by us. Uncanceled context indicates this is the case.
l.Errorf("error reading from websocket: %v", err)
}
return
}
}
}()
for {
select {
// Connection closed
case <-ctx.Done():
return
// Received next stream message
case msg := <-stream.Messages:
l.Tracef("sending message to websocket: %+v", msg)
if err := wsConn.WriteJSON(msg); err != nil {
l.Errorf("error writing json to websocket: %v", err)
return
}
// Reset on each successful send.
pinger.Reset(m.dTicker)
// Send keep-alive "ping"
case <-pinger.C:
l.Trace("pinging websocket ...")
if err := wsConn.WriteMessage(
websocket.PingMessage,
[]byte{},
); err != nil {
l.Errorf("error writing ping to websocket: %v", err)
return
}
}
}
}()
}