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filter_echo.go
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/
filter_echo.go
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/*
* Copyright (c) 2018. 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 (
"sync"
"github.com/pydio/cells/data/source/sync/lib/common"
)
type LockEvent struct {
Source common.PathSyncSource
Path string
OperationId string
}
type UnlockEvent struct {
Source common.PathSyncSource
Path string
}
type EchoFilter struct {
sourcesOperations map[common.PathSyncSource]map[string]string
mapMutex *sync.Mutex
LockEvents chan LockEvent
UnlockEvents chan UnlockEvent
}
func (f *EchoFilter) lockFileTo(source common.PathSyncSource, path string, operationId string) {
var operations map[string]string
var ok bool
if operations, ok = f.sourcesOperations[source]; !ok {
operations = make(map[string]string)
f.sourcesOperations[source] = operations
}
operations[path] = operationId
}
func (f *EchoFilter) unlockFile(source common.PathSyncSource, path string) {
if operations, ok := f.sourcesOperations[source]; ok {
delete(operations, path)
if len(operations) == 0 {
delete(f.sourcesOperations, source)
}
}
}
func (f *EchoFilter) filterEvent(event common.EventInfo) common.EventInfo {
if operations, ok := f.sourcesOperations[event.PathSyncSource]; ok {
if value, pOk := operations[event.Path]; pOk {
event.OperationId = value
return event
}
}
//log.Printf("No associated operation for event %v - map was %v, source was %v", event, f.sourcesOperations, event.PathSyncSource)
return event
}
func (f *EchoFilter) ListenLocksEvents() {
for {
select {
case lock := <-f.LockEvents:
f.mapMutex.Lock()
f.lockFileTo(lock.Source, lock.Path, lock.OperationId)
f.mapMutex.Unlock()
case unlock := <-f.UnlockEvents:
f.mapMutex.Lock()
f.unlockFile(unlock.Source, unlock.Path)
f.mapMutex.Unlock()
}
}
}
func (f *EchoFilter) CreateFilter() (in chan common.EventInfo, out chan common.EventInfo) {
out = make(chan common.EventInfo)
in = make(chan common.EventInfo)
go func() {
defer close(out)
defer close(in)
for event := range in {
if event.OperationId != "" {
out <- event
continue
}
f.mapMutex.Lock()
e := f.filterEvent(event)
//log.Printf("Sending to filter output %v", e)
out <- e
f.mapMutex.Unlock()
}
}()
return in, out
}
func NewEchoFilter() (ef *EchoFilter) {
sourcesOperations := make(map[common.PathSyncSource]map[string]string)
lockEvents := make(chan LockEvent)
unlockEvents := make(chan UnlockEvent)
ef = &EchoFilter{
sourcesOperations: sourcesOperations,
LockEvents: lockEvents,
UnlockEvents: unlockEvents,
mapMutex: &sync.Mutex{},
}
return ef
}