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echo-filter.go
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echo-filter.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells 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.
*
* Pydio Cells 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 Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package filters
import (
"context"
"sync"
"go.uber.org/zap"
"github.com/pydio/cells/v4/common/log"
"github.com/pydio/cells/v4/common/sync/model"
)
// EchoFilter tries to detect events that are linked to an operation that has
// just been performed by a processor. It listen to two Lock and Unlock events channels
// to maintain an internal list of events that have been performed. It's the mission of
// the processor to actually unlock after a given time.
type EchoFilter struct {
sync.Mutex
sources map[model.PathSyncSource]map[string]string
locksChan chan model.LockEvent
}
// NewEchoFilter creates a new EchoFilter
func NewEchoFilter() *EchoFilter {
e := &EchoFilter{
sources: make(map[model.PathSyncSource]map[string]string),
locksChan: make(chan model.LockEvent),
}
//go e.listenLocks()
return e
}
func (f *EchoFilter) GetLocksChan() chan model.LockEvent {
return f.locksChan
}
func (f *EchoFilter) Start() {
go f.listenLocks()
}
func (f *EchoFilter) Stop() {
close(f.locksChan)
}
func (f *EchoFilter) Pipe(in chan model.EventInfo) (out chan model.EventInfo) {
out = make(chan model.EventInfo)
go func() {
defer close(out)
for event := range in {
if event.OperationId != "" {
out <- event
continue
}
f.Lock()
e := f.filterEvent(event)
out <- e
f.Unlock()
}
}()
return out
}
func (f *EchoFilter) listenLocks() {
for lock := range f.locksChan {
f.Lock()
if lock.Type == model.LockEventLock {
f.lockFileTo(lock.Source, lock.Path, lock.OperationId)
} else {
f.unlockFile(lock.Source, lock.Path)
}
f.Unlock()
}
}
func (f *EchoFilter) lockFileTo(source model.PathSyncSource, path string, operationId string) {
log.Logger(context.Background()).Debug("Locking File "+path, zap.String("source", source.GetEndpointInfo().URI))
var operations map[string]string
var ok bool
if operations, ok = f.sources[source]; !ok {
operations = make(map[string]string)
f.sources[source] = operations
}
operations[path] = operationId
}
func (f *EchoFilter) unlockFile(source model.PathSyncSource, path string) {
if operations, ok := f.sources[source]; ok {
log.Logger(context.Background()).Debug("Unlocking File "+path, zap.String("source", source.GetEndpointInfo().URI))
delete(operations, path)
if len(operations) == 0 {
delete(f.sources, source)
}
}
}
func (f *EchoFilter) filterEvent(event model.EventInfo) model.EventInfo {
if operations, ok := f.sources[event.Source]; ok {
if value, pOk := operations[event.Path]; pOk {
event.OperationId = value
log.Logger(context.Background()).Debug("Filter Event - Setting OperationId on event " + event.Path + " and unlocking")
delete(operations, event.Path)
if len(operations) == 0 {
delete(f.sources, event.Source)
}
return event
}
}
return event
}