forked from pydio/cells-sync
/
http-handler-patches.go
116 lines (103 loc) · 2.76 KB
/
http-handler-patches.go
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/*
* Copyright 2019 Abstrium SAS
*
* This file is part of Cells Sync.
*
* Cells Sync is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Cells Sync 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Cells Sync. If not, see <https://www.gnu.org/licenses/>.
*/
package control
import (
"fmt"
"net/http"
"strconv"
"sync"
"time"
"github.com/gin-gonic/gin"
"github.com/pydio/cells-sync/endpoint"
"github.com/pydio/cells/common/sync/merger"
)
type PatchesRequest struct {
SyncUUID string `uri:"uuid" binding:"required"`
Offset int `uri:"offset" binding:"numeric"`
Limit int `uri:"limit"`
}
type PatchesResponse struct {
Patches []merger.Patch
}
func (h *HttpServer) parsePatchRequest(c *gin.Context) (*PatchesRequest, error) {
pR := &PatchesRequest{
SyncUUID: c.Param("uuid"),
Limit: 10,
}
if pR.SyncUUID == "" {
return nil, fmt.Errorf("please provide a sync UUID")
}
if o, e := strconv.ParseInt(c.Param("offset"), 10, 64); e == nil {
pR.Offset = int(o)
}
if l, e := strconv.ParseInt(c.Param("limit"), 10, 64); e == nil {
pR.Limit = int(l)
}
return pR, nil
}
// reqRespStore uses a Pub/Sub model to synchronously retrieve a pointer to the PatchStore of a sync.
func (h *HttpServer) reqRespStore(syncUUID string) *endpoint.PatchStore {
var store *endpoint.PatchStore
wg := sync.WaitGroup{}
wg.Add(1)
ch := GetBus().Sub(TopicStore_ + syncUUID)
go func() {
defer func() {
wg.Done()
GetBus().Unsub(ch)
}()
for {
select {
case s := <-ch:
store = s.(*endpoint.PatchStore)
return
case <-time.After(250 * time.Millisecond):
return
}
}
}()
GetBus().Pub(MessagePublishStore, TopicSync_+syncUUID)
wg.Wait()
return store
}
// listPatches loads patches from store
func (h *HttpServer) listPatches(c *gin.Context) {
request, e := h.parsePatchRequest(c)
if e != nil {
h.writeError(c, e)
return
}
store := h.reqRespStore(request.SyncUUID)
if store == nil {
h.writeError(c, fmt.Errorf("cannot load store"))
return
}
patches, err := store.Load(request.Offset, request.Limit)
if err != nil {
h.writeError(c, err)
return
}
data := make(map[string]merger.Patch)
for _, p := range patches {
data[fmt.Sprintf("%d", p.GetStamp().Unix())] = p
}
c.Header("Cache-Control", "no-cache, no-store")
c.Header("Pragma", "no-cache")
c.JSON(http.StatusOK, data)
}