134 lines
4.3 KiB
Go
134 lines
4.3 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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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package stream
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import (
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"context"
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"errors"
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"fmt"
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"codeberg.org/gruf/go-kv"
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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/log"
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"github.com/superseriousbusiness/gotosocial/internal/stream"
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)
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// Open returns a new Stream for the given account, which will contain a channel for passing messages back to the caller.
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func (p *Processor) Open(ctx context.Context, account *gtsmodel.Account, streamType string) (*stream.Stream, gtserror.WithCode) {
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l := log.WithContext(ctx).WithFields(kv.Fields{
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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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var (
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streamID string
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err error
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)
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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: %w", err))
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}
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// Each stream can be subscibed to multiple types.
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// Record them in a set, and include the initial one
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// if it was given to us.
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streamTypes := map[string]any{}
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if streamType != "" {
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streamTypes[streamType] = true
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}
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newStream := &stream.Stream{
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ID: streamID,
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StreamTypes: streamTypes,
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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, newStream)
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v, ok := p.streamMap.Load(account.ID)
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if ok {
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// There is an entry in the streamMap
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// for this account. Parse it out.
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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 new stream to existing entry.
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streamsForAccount.Lock()
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streamsForAccount.Streams = append(streamsForAccount.Streams, newStream)
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streamsForAccount.Unlock()
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} else {
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// There is no entry in the streamMap for
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// this account yet. Create one and store it.
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p.streamMap.Store(account.ID, &stream.StreamsForAccount{
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Streams: []*stream.Stream{
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newStream,
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},
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})
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}
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return newStream, 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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