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