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server.go
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server.go
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package server
import (
"context"
"fmt"
"github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"google.golang.org/grpc/health"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
var (
_ etcdserverpb.KVServer = (*KVServerBridge)(nil)
_ etcdserverpb.WatchServer = (*KVServerBridge)(nil)
)
type KVServerBridge struct {
limited *LimitedServer
}
func New(backend Backend) *KVServerBridge {
return &KVServerBridge{
limited: &LimitedServer{
backend: backend,
},
}
}
func (k *KVServerBridge) Register(server *grpc.Server) {
etcdserverpb.RegisterLeaseServer(server, k)
etcdserverpb.RegisterWatchServer(server, k)
etcdserverpb.RegisterKVServer(server, k)
hsrv := health.NewServer()
hsrv.SetServingStatus("", healthpb.HealthCheckResponse_SERVING)
healthpb.RegisterHealthServer(server, hsrv)
}
func (k *KVServerBridge) Range(ctx context.Context, r *etcdserverpb.RangeRequest) (*etcdserverpb.RangeResponse, error) {
if r.KeysOnly {
return nil, unsupported("keysOnly")
}
if r.MaxCreateRevision != 0 {
return nil, unsupported("maxCreateRevision")
}
if r.SortOrder != 0 {
return nil, unsupported("sortOrder")
}
if r.SortTarget != 0 {
return nil, unsupported("sortTarget")
}
if r.Serializable {
return nil, unsupported("serializable")
}
if r.KeysOnly {
return nil, unsupported("keysOnly")
}
if r.MinModRevision != 0 {
return nil, unsupported("minModRevision")
}
if r.MinCreateRevision != 0 {
return nil, unsupported("minCreateRevision")
}
if r.MaxCreateRevision != 0 {
return nil, unsupported("maxCreateRevision")
}
if r.MaxModRevision != 0 {
return nil, unsupported("maxModRevision")
}
resp, err := k.limited.Range(ctx, r)
if err != nil {
logrus.Errorf("error while range on %s %s: %v", r.Key, r.RangeEnd, err)
return nil, err
}
rangeResponse := &etcdserverpb.RangeResponse{
More: resp.More,
Count: resp.Count,
Header: resp.Header,
Kvs: toKVs(resp.Kvs...),
}
return rangeResponse, nil
}
func toKVs(kvs ...*KeyValue) []*mvccpb.KeyValue {
if len(kvs) == 0 || kvs[0] == nil {
return nil
}
ret := make([]*mvccpb.KeyValue, 0, len(kvs))
for _, kv := range kvs {
newKV := toKV(kv)
if newKV == nil {
fmt.Println("HIHIHIH")
} else {
ret = append(ret, toKV(kv))
}
}
return ret
}
func toKV(kv *KeyValue) *mvccpb.KeyValue {
if kv == nil {
return nil
}
return &mvccpb.KeyValue{
Key: []byte(kv.Key),
Value: kv.Value,
Lease: kv.Lease,
CreateRevision: kv.CreateRevision,
ModRevision: kv.ModRevision,
}
}
func (k *KVServerBridge) Put(ctx context.Context, r *etcdserverpb.PutRequest) (*etcdserverpb.PutResponse, error) {
return nil, fmt.Errorf("put is not supported")
}
func (k *KVServerBridge) DeleteRange(ctx context.Context, r *etcdserverpb.DeleteRangeRequest) (*etcdserverpb.DeleteRangeResponse, error) {
return nil, fmt.Errorf("delete is not supported")
}
func (k *KVServerBridge) Txn(ctx context.Context, r *etcdserverpb.TxnRequest) (*etcdserverpb.TxnResponse, error) {
res, err := k.limited.Txn(ctx, r)
if err != nil {
logrus.Errorf("error in txn: %v", err)
}
return res, err
}
func (k *KVServerBridge) Compact(ctx context.Context, r *etcdserverpb.CompactionRequest) (*etcdserverpb.CompactionResponse, error) {
return &etcdserverpb.CompactionResponse{
Header: &etcdserverpb.ResponseHeader{
Revision: r.Revision,
},
}, nil
}
func unsupported(field string) error {
return fmt.Errorf("%s is unsupported", field)
}