mirror of
https://gitee.com/rainbond/Rainbond.git
synced 2024-12-04 12:47:36 +08:00
99 lines
3.4 KiB
Go
99 lines
3.4 KiB
Go
// RAINBOND, Application Management Platform
|
|
// Copyright (C) 2014-2017 Goodrain Co., Ltd.
|
|
|
|
// This program 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. For any non-GPL usage of Rainbond,
|
|
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
|
|
// must be obtained first.
|
|
|
|
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package watch
|
|
|
|
import (
|
|
"path"
|
|
|
|
"github.com/coreos/etcd/clientv3"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
type watchAPI struct {
|
|
client *clientv3.Client
|
|
// getOpts contains additional options that should be passed
|
|
// to all Get() calls.
|
|
getOps []clientv3.OpOption
|
|
pathPrefix string
|
|
watcher *watcher
|
|
}
|
|
|
|
// New returns an etcd3 implementation of Watch.
|
|
func New(c *clientv3.Client, prefix string) Watch {
|
|
return newWatchAPI(c, true, prefix)
|
|
}
|
|
|
|
// NewWithNoQuorumRead returns etcd3 implementation of storage.Interface
|
|
// where Get operations don't require quorum read.
|
|
func NewWithNoQuorumRead(c *clientv3.Client, prefix string) Watch {
|
|
return newWatchAPI(c, false, prefix)
|
|
}
|
|
|
|
func newWatchAPI(c *clientv3.Client, quorumRead bool, prefix string) *watchAPI {
|
|
|
|
result := &watchAPI{
|
|
client: c,
|
|
// for compatibility with etcd2 impl.
|
|
// no-op for default prefix of '/registry'.
|
|
// keeps compatibility with etcd2 impl for custom prefixes that don't start with '/'
|
|
pathPrefix: prefix,
|
|
watcher: newWatcher(c),
|
|
}
|
|
if !quorumRead {
|
|
// In case of non-quorum reads, we can set WithSerializable()
|
|
// options for all Get operations.
|
|
result.getOps = append(result.getOps, clientv3.WithSerializable())
|
|
}
|
|
return result
|
|
}
|
|
|
|
// Watch implements storage.Interface.Watch.
|
|
func (s *watchAPI) Watch(ctx context.Context, key string, resourceVersion string) (Interface, error) {
|
|
return s.watch(ctx, key, resourceVersion, false)
|
|
}
|
|
|
|
// WatchList implements storage.Interface.WatchList.
|
|
func (s *watchAPI) WatchList(ctx context.Context, key string, resourceVersion string) (Interface, error) {
|
|
return s.watch(ctx, key, resourceVersion, true)
|
|
}
|
|
|
|
func (s *watchAPI) watch(ctx context.Context, key string, rv string, recursive bool) (Interface, error) {
|
|
rev, err := ParseWatchResourceVersion(rv)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
key = path.Join(s.pathPrefix, key)
|
|
return s.watcher.Watch(ctx, key, int64(rev), recursive)
|
|
}
|
|
|
|
// ttlOpts returns client options based on given ttl.
|
|
// ttl: if ttl is non-zero, it will attach the key to a lease with ttl of roughly the same length
|
|
func (s *watchAPI) ttlOpts(ctx context.Context, ttl int64) ([]clientv3.OpOption, error) {
|
|
if ttl == 0 {
|
|
return nil, nil
|
|
}
|
|
// TODO: one lease per ttl key is expensive. Based on current use case, we can have a long window to
|
|
// put keys within into same lease. We shall benchmark this and optimize the performance.
|
|
lcr, err := s.client.Lease.Grant(ctx, ttl)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return []clientv3.OpOption{clientv3.WithLease(clientv3.LeaseID(lcr.ID))}, nil
|
|
}
|