mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-30 07:32:45 +00:00
69 lines
2.6 KiB
Go
69 lines
2.6 KiB
Go
|
/*
|
||
|
|
GoToSocial
|
||
|
|
Copyright (C) 2021-2022 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 httpclient
|
||
|
|
|
||
|
|
import (
|
||
|
|
"strings"
|
||
|
|
"sync"
|
||
|
|
|
||
|
|
"github.com/superseriousbusiness/gotosocial/internal/log"
|
||
|
|
)
|
||
|
|
|
||
|
|
type requestQueue struct {
|
||
|
|
hostQueues sync.Map // map of `hostQueue`
|
||
|
|
maxOpenConns int // max open conns per host per request method
|
||
|
|
}
|
||
|
|
|
||
|
|
type hostQueue struct {
|
||
|
|
slotsByMethod sync.Map
|
||
|
|
}
|
||
|
|
|
||
|
|
// getWaitSpot returns a wait channel and release function for http clients
|
||
|
|
// that want to do requests politely: that is, wait for their turn.
|
||
|
|
//
|
||
|
|
// To wait, a caller should do a select on an attempted insert into the
|
||
|
|
// returned wait channel. Once the insert succeeds, then the caller should
|
||
|
|
// proceed with the http request that pertains to the given host + method.
|
||
|
|
// It doesn't matter what's put into the wait channel, just any interface{}.
|
||
|
|
//
|
||
|
|
// When the caller is finished with their http request, they should free up the
|
||
|
|
// slot they were occupying in the wait queue, by calling the release function.
|
||
|
|
//
|
||
|
|
// The reason for the caller needing to provide host and method, is that each
|
||
|
|
// remote host has a separate wait queue, and there's a separate wait queue
|
||
|
|
// per method for that host as well. This ensures that outgoing requests can still
|
||
|
|
// proceed for others hosts and methods while other requests are undergoing,
|
||
|
|
// while also preventing one host from being spammed with, for example, a
|
||
|
|
// shitload of GET requests all at once.
|
||
|
|
func (rc *requestQueue) getWaitSpot(host string, method string) (wait chan<- interface{}, release func()) {
|
||
|
|
hostQueueI, _ := rc.hostQueues.LoadOrStore(host, new(hostQueue))
|
||
|
|
hostQueue, ok := hostQueueI.(*hostQueue)
|
||
|
|
if !ok {
|
||
|
|
log.Panic("hostQueueI was not a *hostQueue")
|
||
|
|
}
|
||
|
|
|
||
|
|
waitSlotI, _ := hostQueue.slotsByMethod.LoadOrStore(strings.ToUpper(method), make(chan interface{}, rc.maxOpenConns))
|
||
|
|
methodQueue, ok := waitSlotI.(chan interface{})
|
||
|
|
if !ok {
|
||
|
|
log.Panic("waitSlotI was not a chan interface{}")
|
||
|
|
}
|
||
|
|
|
||
|
|
return methodQueue, func() { <-methodQueue }
|
||
|
|
}
|