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watcher.go
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watcher.go
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/*
* Copyright (c) 2019-2022. 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 registry
import (
"errors"
pb "github.com/pydio/cells/v4/common/proto/registry"
)
type watcher struct {
id string
wo Options
res chan Result
exit chan bool
}
func NewWatcher(id string, opts Options, res chan Result) Watcher {
exit := make(chan bool)
return &watcher{
id: id,
wo: opts,
res: res,
exit: exit,
}
}
func (m *watcher) actionMatches(event, filter pb.ActionType) bool {
// FULL_LIST : specific action only
if filter == pb.ActionType_FULL_LIST && event != pb.ActionType_FULL_LIST {
return false
}
// FULL_DIFF : skip diff and full_list
if filter == pb.ActionType_FULL_DIFF && event < pb.ActionType_CREATE {
return false
}
// Specific Action: checking action matches
if filter >= pb.ActionType_CREATE && event != filter {
return false
}
return true
}
func (m *watcher) Next() (Result, error) {
for {
select {
case r := <-m.res:
// If filter Actions are defined, skip if event does not match any
if !m.wo.ActionsMatch(r.Action()) {
continue
}
// Return everything
if len(m.wo.IDs) == 0 && len(m.wo.Names) == 0 && len(m.wo.Types) == 0 && len(m.wo.Filters) == 0 {
return r, nil
}
var items []Item
for _, item := range r.Items() {
foundID := false
for _, id := range m.wo.IDs {
if id == item.ID() {
foundID = true
break
}
}
if len(m.wo.IDs) > 0 && !foundID {
continue
}
foundName := false
for _, name := range m.wo.Names {
if name == item.Name() {
foundName = true
break
}
}
if len(m.wo.Names) > 0 && !foundName {
continue
}
foundType := false
L:
for _, itemType := range m.wo.Types {
switch itemType {
case pb.ItemType_NODE:
var node Node
if item.As(&node) {
foundType = true
break L
}
case pb.ItemType_SERVICE:
var service Service
if item.As(&service) {
foundType = true
break L
}
case pb.ItemType_SERVER:
var node Server
if item.As(&node) {
foundType = true
break L
}
case pb.ItemType_DAO:
var dao Dao
if item.As(&dao) {
foundType = true
break L
}
case pb.ItemType_EDGE:
var edge Edge
if item.As(&edge) {
foundType = true
break L
}
case pb.ItemType_GENERIC, pb.ItemType_ADDRESS, pb.ItemType_TAG, pb.ItemType_ENDPOINT:
var generic Generic
if item.As(&generic) &&
(itemType == pb.ItemType_GENERIC || itemType == generic.Type()) {
foundType = true
break L
}
}
}
if len(m.wo.Types) > 0 && !foundType {
continue
}
foundFilter := true
for _, filter := range m.wo.Filters {
if !filter(item) {
foundFilter = false
break
}
}
if !foundFilter {
continue
}
items = append(items, item)
}
if len(items) == 0 {
continue
}
return &result{
action: r.Action(),
items: items,
}, nil
case <-m.wo.Context.Done():
return nil, errors.New("context done")
case <-m.exit:
return nil, errors.New("watcher stopped")
}
}
}
func (m *watcher) Stop() {
select {
case <-m.exit:
return
default:
close(m.exit)
}
}
type result struct {
action pb.ActionType
items []Item
}
func NewResult(action pb.ActionType, items []Item) Result {
return &result{
action: action,
items: items,
}
}
func (r *result) Action() pb.ActionType {
return r.action
}
func (r *result) Items() []Item {
return r.items
}