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cleaner.go
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/
cleaner.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 grpc
import (
"context"
"sync"
"time"
"github.com/golang/protobuf/ptypes/any"
"github.com/micro/protobuf/ptypes"
"go.uber.org/zap"
"github.com/pydio/cells/common"
"github.com/pydio/cells/common/log"
"github.com/pydio/cells/common/micro"
"github.com/pydio/cells/common/proto/idm"
"github.com/pydio/cells/common/service/proto"
)
type AclBatcher struct {
timeout time.Duration
incoming chan *idm.ACL
workspaceId string
done chan string
}
func NewAclBatcher(wsId string, done chan string, timeout time.Duration) *AclBatcher {
a := &AclBatcher{
timeout: timeout,
incoming: make(chan *idm.ACL),
workspaceId: wsId,
done: done,
}
go a.Start()
return a
}
func (a *AclBatcher) Start() {
defer func() {
a.done <- a.workspaceId
}()
for {
select {
case <-a.incoming:
// Do nothing, just select and reset timeout
case <-time.After(a.timeout):
return
}
}
}
// WsCleaner subscribe to ACL:Delete events to clean workspaces
// that do not have any ACLs anymore
type WsCleaner struct {
Handler *Handler
batches map[string]*AclBatcher
listener chan string
lock *sync.Mutex
ctx context.Context
}
func NewWsCleaner(h *Handler, ctx context.Context) *WsCleaner {
listener := make(chan string, 1)
lock := &sync.Mutex{}
w := &WsCleaner{
Handler: h,
ctx: ctx,
listener: listener,
lock: lock,
batches: make(map[string]*AclBatcher),
}
// Start listening to ws
go func() {
for {
select {
case wsId := <-listener:
if err := w.deleteEmptyWs(wsId); err != nil {
log.Logger(context.Background()).Info("Error while trying to delete workspace without ACLs (" + wsId + ")")
}
lock.Lock()
delete(w.batches, wsId)
lock.Unlock()
}
}
}()
return w
}
func (c *WsCleaner) Handle(ctx context.Context, msg *idm.ChangeEvent) error {
if msg.Type != idm.ChangeEventType_DELETE || msg.Acl == nil {
return nil
}
acl := msg.Acl
if acl.WorkspaceID == "" {
return nil
}
c.lock.Lock()
if batcher, ok := c.batches[acl.WorkspaceID]; ok {
batcher.incoming <- acl
} else {
batcher := NewAclBatcher(acl.WorkspaceID, c.listener, 3*time.Second)
c.batches[acl.WorkspaceID] = batcher
batcher.incoming <- acl
}
c.lock.Unlock()
return nil
}
func (c *WsCleaner) deleteEmptyWs(workspaceId string) error {
ctx := context.Background()
// Check if there are still some ACLs for this workspace
cl := idm.NewACLServiceClient(common.SERVICE_GRPC_NAMESPACE_+common.SERVICE_ACL, defaults.NewClient())
q, _ := ptypes.MarshalAny(&idm.ACLSingleQuery{
WorkspaceIDs: []string{workspaceId},
})
streamer, e := cl.SearchACL(ctx, &idm.SearchACLRequest{
Query: &service.Query{SubQueries: []*any.Any{q}},
})
if e != nil {
return e
}
defer streamer.Close()
hasAcl := false
for {
resp, e := streamer.Recv()
if e != nil {
break
}
if resp != nil {
hasAcl = true
break
}
}
if !hasAcl {
q2, _ := ptypes.MarshalAny(&idm.WorkspaceSingleQuery{
Uuid: workspaceId,
})
e := c.Handler.DeleteWorkspace(c.ctx, &idm.DeleteWorkspaceRequest{
Query: &service.Query{SubQueries: []*any.Any{q2}},
}, &idm.DeleteWorkspaceResponse{})
if e == nil {
log.Logger(c.ctx).Info("Deleted workspace based on ACL Delete events", zap.String("wsId", workspaceId))
}
}
return nil
}