forked from pydio/cells
-
Notifications
You must be signed in to change notification settings - Fork 0
/
echo-filter.go
150 lines (128 loc) · 3.71 KB
/
echo-filter.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*
* 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 (
"context"
"sync"
"go.uber.org/zap"
"github.com/pydio/cells/common/log"
"github.com/pydio/cells/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 {
select {
case event, ok := <-in:
if !ok {
// return on close
return
}
if event.OperationId != "" {
out <- event
continue
}
f.Lock()
e := f.filterEvent(event)
out <- e
f.Unlock()
}
}
}()
return out
}
func (f *EchoFilter) listenLocks() {
for {
select {
case lock, ok := <-f.locksChan:
if !ok {
return
}
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
}