/
cloudfiles.go
104 lines (88 loc) · 2.44 KB
/
cloudfiles.go
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/**
* Copyright 2014 Paul Querna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package notify
import (
log "github.com/Sirupsen/logrus"
"github.com/pquerna/distsync/common"
"github.com/rackspace/gophercloud"
osObjects "github.com/rackspace/gophercloud/openstack/objectstorage/v1/objects"
"github.com/rackspace/gophercloud/rackspace"
"github.com/rackspace/gophercloud/rackspace/objectstorage/v1/objects"
"errors"
)
type cloudFilesPoll struct {
bucket string
lastEtag string
creds *common.RackspaceCreds
}
func NewCloudFilesPoll(conf *common.RackspaceCreds, bucketName string) (Notifier, error) {
return newTimedPoller(
&cloudFilesPoll{
bucket: bucketName,
creds: conf,
}), nil
}
func (cf *cloudFilesPoll) client() (*gophercloud.ServiceClient, error) {
auth := gophercloud.AuthOptions{
Username: cf.creds.Username,
APIKey: cf.creds.ApiKey,
}
ac, err := rackspace.AuthenticatedClient(auth)
if err != nil {
return nil, err
}
// TOOD: auto-detect serviceNet?
return rackspace.NewObjectStorageV1(ac, gophercloud.EndpointOpts{
Region: cf.creds.Region,
})
}
func (cf *cloudFilesPoll) Poll() (bool, error) {
client, err := cf.client()
if err != nil {
return false, err
}
log.WithFields(log.Fields{
"last_etag": cf.lastEtag,
"bucket": cf.bucket,
"file": ".distsync",
}).Debug("Checking for changed ETag")
resp := objects.Download(client, cf.bucket, ".distsync",
&osObjects.DownloadOpts{
IfNoneMatch: cf.lastEtag,
})
if resp.Err != nil {
return false, resp.Err
}
defer resp.Body.Close()
headers, err := resp.ExtractHeader()
if err != nil {
return false, err
}
etag := headers.Get("ETag")
if etag == "" {
return false, errors.New("Empty ETag on Request")
}
if etag != cf.lastEtag {
log.WithFields(log.Fields{
"last_etag": cf.lastEtag,
"new_etag": etag,
}).Info("ETag changed, notifying watchers.")
cf.lastEtag = etag
return true, nil
}
return false, nil
}