121 lines
3.9 KiB
Go
121 lines
3.9 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package streaming
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import (
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"context"
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"errors"
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"fmt"
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"github.com/sirupsen/logrus"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/id"
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"github.com/superseriousbusiness/gotosocial/internal/stream"
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)
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func (p *processor) OpenStreamForAccount(ctx context.Context, account *gtsmodel.Account, streamType string) (*stream.Stream, gtserror.WithCode) {
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l := logrus.WithFields(logrus.Fields{
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"func": "OpenStreamForAccount",
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"account": account.ID,
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"streamType": streamType,
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})
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l.Debug("received open stream request")
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// each stream needs a unique ID so we know to close it
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streamID, err := id.NewRandomULID()
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if err != nil {
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return nil, gtserror.NewErrorInternalError(fmt.Errorf("error generating stream id: %s", err))
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}
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thisStream := &stream.Stream{
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ID: streamID,
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Type: streamType,
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Messages: make(chan *stream.Message, 100),
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Hangup: make(chan interface{}, 1),
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Connected: true,
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}
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go p.waitToCloseStream(account, thisStream)
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v, ok := p.streamMap.Load(account.ID)
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if !ok || v == nil {
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// there is no entry in the streamMap for this account yet, so make one and store it
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streamsForAccount := &stream.StreamsForAccount{
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Streams: []*stream.Stream{
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thisStream,
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},
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}
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p.streamMap.Store(account.ID, streamsForAccount)
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} else {
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// there is an entry in the streamMap for this account
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// parse the interface as a streamsForAccount
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streamsForAccount, ok := v.(*stream.StreamsForAccount)
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if !ok {
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return nil, gtserror.NewErrorInternalError(errors.New("stream map error"))
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}
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// append this stream to it
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streamsForAccount.Lock()
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streamsForAccount.Streams = append(streamsForAccount.Streams, thisStream)
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streamsForAccount.Unlock()
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}
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return thisStream, nil
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}
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// waitToCloseStream waits until the hangup channel is closed for the given stream.
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// It then iterates through the map of streams stored by the processor, removes the stream from it,
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// and then closes the messages channel of the stream to indicate that the channel should no longer be read from.
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func (p *processor) waitToCloseStream(account *gtsmodel.Account, thisStream *stream.Stream) {
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<-thisStream.Hangup // wait for a hangup message
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// lock the stream to prevent more messages being put in it while we work
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thisStream.Lock()
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defer thisStream.Unlock()
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// indicate the stream is no longer connected
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thisStream.Connected = false
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// load and parse the entry for this account from the stream map
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v, ok := p.streamMap.Load(account.ID)
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if !ok || v == nil {
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return
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}
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streamsForAccount, ok := v.(*stream.StreamsForAccount)
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if !ok {
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return
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}
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// lock the streams for account while we remove this stream from its slice
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streamsForAccount.Lock()
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defer streamsForAccount.Unlock()
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// put everything into modified streams *except* the stream we're removing
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modifiedStreams := []*stream.Stream{}
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for _, s := range streamsForAccount.Streams {
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if s.ID != thisStream.ID {
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modifiedStreams = append(modifiedStreams, s)
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}
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}
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streamsForAccount.Streams = modifiedStreams
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// finally close the messages channel so no more messages can be read from it
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close(thisStream.Messages)
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}
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