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key.go
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key.go
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// Copyright 2015 CoreOS, Inc.
//
// 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 v3rpc implements etcd v3 RPC system based on gRPC.
package v3rpc
import (
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc"
"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc/codes"
"github.com/coreos/etcd/etcdserver"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/storage"
)
var (
plog = capnslog.NewPackageLogger("github.com/coreos/etcd/etcdserver/api", "v3rpc")
)
type kvServer struct {
clusterID int64
memberID int64
raftTimer etcdserver.RaftTimer
kv etcdserver.RaftKV
}
func NewKVServer(s *etcdserver.EtcdServer) pb.KVServer {
return &kvServer{
clusterID: int64(s.Cluster().ID()),
memberID: int64(s.ID()),
raftTimer: s,
kv: s,
}
}
func (s *kvServer) Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error) {
if err := checkRangeRequest(r); err != nil {
return nil, err
}
resp, err := s.kv.Range(ctx, r)
if err != nil {
return nil, togRPCError(err)
}
if resp.Header == nil {
plog.Panic("unexpected nil resp.Header")
}
s.fillInHeader(resp.Header)
return resp, err
}
func (s *kvServer) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error) {
if err := checkPutRequest(r); err != nil {
return nil, err
}
resp, err := s.kv.Put(ctx, r)
if err != nil {
return nil, togRPCError(err)
}
if resp.Header == nil {
plog.Panic("unexpected nil resp.Header")
}
s.fillInHeader(resp.Header)
return resp, err
}
func (s *kvServer) DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
if err := checkDeleteRequest(r); err != nil {
return nil, err
}
resp, err := s.kv.DeleteRange(ctx, r)
if err != nil {
return nil, togRPCError(err)
}
if resp.Header == nil {
plog.Panic("unexpected nil resp.Header")
}
s.fillInHeader(resp.Header)
return resp, err
}
func (s *kvServer) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error) {
if err := checkTxnRequest(r); err != nil {
return nil, err
}
resp, err := s.kv.Txn(ctx, r)
if err != nil {
return nil, togRPCError(err)
}
if resp.Header == nil {
plog.Panic("unexpected nil resp.Header")
}
s.fillInHeader(resp.Header)
return resp, err
}
func (s *kvServer) Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.CompactionResponse, error) {
resp, err := s.kv.Compact(ctx, r)
if err != nil {
return nil, togRPCError(err)
}
if resp.Header == nil {
plog.Panic("unexpected nil resp.Header")
}
s.fillInHeader(resp.Header)
return resp, nil
}
// fillInHeader populates pb.ResponseHeader from kvServer, except Revision.
func (s *kvServer) fillInHeader(h *pb.ResponseHeader) {
h.ClusterId = uint64(s.clusterID)
h.MemberId = uint64(s.memberID)
h.RaftTerm = s.raftTimer.Term()
}
func checkRangeRequest(r *pb.RangeRequest) error {
if len(r.Key) == 0 {
return ErrEmptyKey
}
return nil
}
func checkPutRequest(r *pb.PutRequest) error {
if len(r.Key) == 0 {
return ErrEmptyKey
}
return nil
}
func checkDeleteRequest(r *pb.DeleteRangeRequest) error {
if len(r.Key) == 0 {
return ErrEmptyKey
}
return nil
}
func checkTxnRequest(r *pb.TxnRequest) error {
for _, c := range r.Compare {
if len(c.Key) == 0 {
return ErrEmptyKey
}
}
for _, u := range r.Success {
if err := checkRequestUnion(u); err != nil {
return err
}
}
for _, u := range r.Failure {
if err := checkRequestUnion(u); err != nil {
return err
}
}
return nil
}
func checkRequestUnion(u *pb.RequestUnion) error {
// TODO: ensure only one of the field is set.
switch {
case u.RequestRange != nil:
return checkRangeRequest(u.RequestRange)
case u.RequestPut != nil:
return checkPutRequest(u.RequestPut)
case u.RequestDeleteRange != nil:
return checkDeleteRequest(u.RequestDeleteRange)
default:
// empty union
return nil
}
}
func togRPCError(err error) error {
switch err {
case storage.ErrCompacted:
return ErrCompacted
case storage.ErrFutureRev:
return ErrFutureRev
// TODO: handle error from raft and timeout
default:
return grpc.Errorf(codes.Unknown, err.Error())
}
}