97 lines
3.5 KiB
Go
97 lines
3.5 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 distributor
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import (
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"github.com/go-fed/activity/pub"
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"github.com/sirupsen/logrus"
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)
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// Distributor should be passed to api modules (see internal/apimodule/...). It is used for
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// passing messages back and forth from the client API and the federating interface, via channels.
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// It also contains logic for filtering which messages should end up where.
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// It is designed to be used asynchronously: the client API and the federating API should just be able to
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// fire messages into the distributor and not wait for a reply before proceeding with other work. This allows
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// for clean distribution of messages without slowing down the client API and harming the user experience.
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type Distributor interface {
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// ClientAPIIn returns a channel for accepting messages that come from the gts client API.
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ClientAPIIn() chan interface{}
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// ClientAPIOut returns a channel for putting in messages that need to go to the gts client API.
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ClientAPIOut() chan interface{}
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// Start starts the Distributor, reading from its channels and passing messages back and forth.
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Start() error
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// Stop stops the distributor cleanly, finishing handling any remaining messages before closing down.
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Stop() error
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}
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// distributor just implements the Distributor interface
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type distributor struct {
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federator pub.FederatingActor
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clientAPIIn chan interface{}
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clientAPIOut chan interface{}
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stop chan interface{}
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log *logrus.Logger
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}
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// New returns a new Distributor that uses the given federator and logger
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func New(federator pub.FederatingActor, log *logrus.Logger) Distributor {
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return &distributor{
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federator: federator,
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clientAPIIn: make(chan interface{}, 100),
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clientAPIOut: make(chan interface{}, 100),
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stop: make(chan interface{}),
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log: log,
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}
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}
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// ClientAPIIn returns a channel for accepting messages that come from the gts client API.
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func (d *distributor) ClientAPIIn() chan interface{} {
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return d.clientAPIIn
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}
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// ClientAPIOut returns a channel for putting in messages that need to go to the gts client API.
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func (d *distributor) ClientAPIOut() chan interface{} {
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return d.clientAPIOut
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}
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// Start starts the Distributor, reading from its channels and passing messages back and forth.
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func (d *distributor) Start() error {
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go func() {
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DistLoop:
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for {
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select {
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case clientMsgIn := <-d.clientAPIIn:
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d.log.Infof("received clientMsgIn: %+v", clientMsgIn)
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case clientMsgOut := <-d.clientAPIOut:
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d.log.Infof("received clientMsgOut: %+v", clientMsgOut)
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case <-d.stop:
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break DistLoop
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}
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}
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}()
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return nil
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}
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// Stop stops the distributor cleanly, finishing handling any remaining messages before closing down.
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// TODO: empty message buffer properly before stopping otherwise we'll lose federating messages.
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func (d *distributor) Stop() error {
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close(d.stop)
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return nil
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}
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