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server.go
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server.go
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// Copyright 2019-present Open Networking Foundation.
//
// 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 lock
import (
"context"
"github.com/atomix/api/proto/atomix/headers"
api "github.com/atomix/api/proto/atomix/lock"
"github.com/lucasbfernandes/go-framework/pkg/atomix/primitive"
streams "github.com/lucasbfernandes/go-framework/pkg/atomix/stream"
"github.com/golang/protobuf/proto"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// Server is an implementation of MapServiceServer for the map primitive
type Server struct {
*primitive.Server
}
// Create opens a new session
func (s *Server) Create(ctx context.Context, request *api.CreateRequest) (*api.CreateResponse, error) {
log.Tracef("Received CreateRequest %+v", request)
header, err := s.DoCreateService(ctx, request.Header)
if err != nil {
return nil, err
}
response := &api.CreateResponse{
Header: header,
}
log.Tracef("Sending CreateResponse %+v", response)
return response, nil
}
// Close closes a session
func (s *Server) Close(ctx context.Context, request *api.CloseRequest) (*api.CloseResponse, error) {
log.Tracef("Received CloseRequest %+v", request)
if request.Delete {
header, err := s.DoDeleteService(ctx, request.Header)
if err != nil {
return nil, err
}
response := &api.CloseResponse{
Header: header,
}
log.Tracef("Sending CloseResponse %+v", response)
return response, nil
}
header, err := s.DoCloseService(ctx, request.Header)
if err != nil {
return nil, err
}
response := &api.CloseResponse{
Header: header,
}
log.Tracef("Sending CloseResponse %+v", response)
return response, nil
}
// Lock acquires a lock
func (s *Server) Lock(ctx context.Context, request *api.LockRequest) (*api.LockResponse, error) {
log.Tracef("Received LockRequest %+v", request)
in, err := proto.Marshal(&LockRequest{
Timeout: request.Timeout,
})
if err != nil {
return nil, err
}
stream := streams.NewBufferedStream()
if err := s.DoCommandStream(ctx, opLock, in, request.Header, stream); err != nil {
return nil, err
}
for {
result, ok := stream.Receive()
if !ok {
return nil, status.Error(codes.Canceled, "stream closed")
}
if result.Failed() {
return nil, result.Error
}
output := result.Value.(primitive.SessionOutput)
if output.Header.Type == headers.ResponseType_RESPONSE {
lockResponse := &LockResponse{}
if err = proto.Unmarshal(output.Value.([]byte), lockResponse); err != nil {
return nil, err
}
response := &api.LockResponse{
Header: output.Header,
Version: uint64(lockResponse.Index),
}
log.Tracef("Sending LockResponse %+v", response)
return response, nil
}
}
}
// Unlock releases the lock
func (s *Server) Unlock(ctx context.Context, request *api.UnlockRequest) (*api.UnlockResponse, error) {
log.Tracef("Received UnlockRequest %+v", request)
in, err := proto.Marshal(&UnlockRequest{
Index: int64(request.Version),
})
if err != nil {
return nil, err
}
out, header, err := s.DoCommand(ctx, opUnlock, in, request.Header)
if err != nil {
return nil, err
}
unlockResponse := &UnlockResponse{}
if err = proto.Unmarshal(out, unlockResponse); err != nil {
return nil, err
}
response := &api.UnlockResponse{
Header: header,
Unlocked: unlockResponse.Succeeded,
}
log.Tracef("Sending UnlockResponse %+v", response)
return response, nil
}
// IsLocked checks whether the lock is held by any session
func (s *Server) IsLocked(ctx context.Context, request *api.IsLockedRequest) (*api.IsLockedResponse, error) {
log.Tracef("Received IsLockedRequest %+v", request)
in, err := proto.Marshal(&IsLockedRequest{
Index: int64(request.Version),
})
if err != nil {
return nil, err
}
out, header, err := s.DoQuery(ctx, opIsLocked, in, request.Header)
if err != nil {
return nil, err
}
isLockedResponse := &IsLockedResponse{}
if err = proto.Unmarshal(out, isLockedResponse); err != nil {
return nil, err
}
response := &api.IsLockedResponse{
Header: header,
IsLocked: isLockedResponse.Locked,
}
log.Tracef("Sending IsLockedResponse %+v", response)
return response, nil
}