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etcd_quota_provider.go
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etcd_quota_provider.go
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// Copyright 2018 Google Inc. All Rights Reserved.
//
// 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 server
import (
"flag"
"fmt"
"github.com/golang/glog"
"github.com/google/trillian/quota"
"github.com/google/trillian/quota/cacheqm"
"github.com/google/trillian/quota/etcd/etcdqm"
"github.com/google/trillian/util/etcd"
)
// QuotaEtcd represents the etcd quota implementation.
const QuotaEtcd = "etcd"
var (
// EtcdServers is a flag containing the address(es) of etcd servers
EtcdServers = flag.String("etcd_servers", "", "A comma-separated list of etcd servers; no etcd registration if empty")
// TODO(Martin2112): suggested renaming these to etc_... to avoid clashes, but will it break existing deploys?
quotaMinBatchSize = flag.Int("quota_min_batch_size", cacheqm.DefaultMinBatchSize, "Minimum number of tokens to request from the quota system. "+
"Zero or lower means batching is disabled. Applicable for etcd quotas.")
quotaMaxCacheEntries = flag.Int("quota_max_cache_entries", cacheqm.DefaultMaxCacheEntries, "Max number of quota specs in the quota cache. "+
"Zero or lower means batching is disabled. Applicable for etcd quotas.")
)
func init() {
if err := RegisterQuotaManager(QuotaEtcd, newEtcdQuotaManager); err != nil {
glog.Fatalf("Failed to register quota manager %v: %v", QuotaEtcd, err)
}
}
func newEtcdQuotaManager() (quota.Manager, error) {
if *EtcdServers == "" {
return nil, fmt.Errorf("Can't create etcd quotamanager - etcd_servers flag is unset")
}
client, err := etcd.NewClient(*EtcdServers)
if err != nil {
return nil, fmt.Errorf("Failed to connect to etcd at %v: %v", *EtcdServers, err)
}
qm := etcdqm.New(client)
if *quotaMinBatchSize > 0 && *quotaMaxCacheEntries > 0 {
cachedQM, err := cacheqm.NewCachedManager(qm, *quotaMinBatchSize, *quotaMaxCacheEntries)
if err != nil {
return nil, err
}
qm = cachedQM
}
glog.Info("Using Etcd QuotaManager")
return qm, nil
}