quota.go

Documentation: go.etcd.io/etcd/server/v3/etcdserver/api/v3rpc

     1  // Copyright 2016 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package v3rpc
    16  
    17  import (
    18  	"context"
    19  
    20  	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
    21  	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
    22  	"go.etcd.io/etcd/client/pkg/v3/types"
    23  	"go.etcd.io/etcd/server/v3/etcdserver"
    24  )
    25  
    26  type quotaKVServer struct {
    27  	pb.KVServer
    28  	qa quotaAlarmer
    29  }
    30  
    31  type quotaAlarmer struct {
    32  	q  etcdserver.Quota
    33  	a  Alarmer
    34  	id types.ID
    35  }
    36  
    37  // check whether request satisfies the quota. If there is not enough space,
    38  // ignore request and raise the free space alarm.
    39  func (qa *quotaAlarmer) check(ctx context.Context, r interface{}) error {
    40  	if qa.q.Available(r) {
    41  		return nil
    42  	}
    43  	req := &pb.AlarmRequest{
    44  		MemberID: uint64(qa.id),
    45  		Action:   pb.AlarmRequest_ACTIVATE,
    46  		Alarm:    pb.AlarmType_NOSPACE,
    47  	}
    48  	qa.a.Alarm(ctx, req)
    49  	return rpctypes.ErrGRPCNoSpace
    50  }
    51  
    52  func NewQuotaKVServer(s *etcdserver.EtcdServer) pb.KVServer {
    53  	return &quotaKVServer{
    54  		NewKVServer(s),
    55  		quotaAlarmer{etcdserver.NewBackendQuota(s, "kv"), s, s.ID()},
    56  	}
    57  }
    58  
    59  func (s *quotaKVServer) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error) {
    60  	if err := s.qa.check(ctx, r); err != nil {
    61  		return nil, err
    62  	}
    63  	return s.KVServer.Put(ctx, r)
    64  }
    65  
    66  func (s *quotaKVServer) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error) {
    67  	if err := s.qa.check(ctx, r); err != nil {
    68  		return nil, err
    69  	}
    70  	return s.KVServer.Txn(ctx, r)
    71  }
    72  
    73  type quotaLeaseServer struct {
    74  	pb.LeaseServer
    75  	qa quotaAlarmer
    76  }
    77  
    78  func (s *quotaLeaseServer) LeaseGrant(ctx context.Context, cr *pb.LeaseGrantRequest) (*pb.LeaseGrantResponse, error) {
    79  	if err := s.qa.check(ctx, cr); err != nil {
    80  		return nil, err
    81  	}
    82  	return s.LeaseServer.LeaseGrant(ctx, cr)
    83  }
    84  
    85  func NewQuotaLeaseServer(s *etcdserver.EtcdServer) pb.LeaseServer {
    86  	return &quotaLeaseServer{
    87  		NewLeaseServer(s),
    88  		quotaAlarmer{etcdserver.NewBackendQuota(s, "lease"), s, s.ID()},
    89  	}
    90  }
    91
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