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mux.go
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/*
* Copyright 2018 The CovenantSQL Authors.
*
* 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 sqlchain
import (
"sync"
"github.com/CovenantSQL/CovenantSQL/proto"
rpc "github.com/CovenantSQL/CovenantSQL/rpc/mux"
)
// MuxService defines multiplexing service of sql-chain.
type MuxService struct {
ServiceName string
serviceMap sync.Map
}
// NewMuxService creates a new multiplexing service and registers it to rpc server.
func NewMuxService(serviceName string, server *rpc.Server) (service *MuxService, err error) {
service = &MuxService{
ServiceName: serviceName,
}
err = server.RegisterService(serviceName, service)
return
}
func (s *MuxService) register(id proto.DatabaseID, service *ChainRPCService) {
s.serviceMap.Store(id, service)
}
func (s *MuxService) unregister(id proto.DatabaseID) {
s.serviceMap.Delete(id)
}
// MuxAdviseNewBlockReq defines a request of the AdviseNewBlock RPC method.
type MuxAdviseNewBlockReq struct {
proto.Envelope
proto.DatabaseID
AdviseNewBlockReq
}
// MuxAdviseNewBlockResp defines a response of the AdviseNewBlock RPC method.
type MuxAdviseNewBlockResp struct {
proto.Envelope
proto.DatabaseID
AdviseNewBlockResp
}
// MuxFetchBlockReq defines a request of the FetchBlock RPC method.
type MuxFetchBlockReq struct {
proto.Envelope
proto.DatabaseID
FetchBlockReq
}
// MuxFetchBlockResp defines a response of the FetchBlock RPC method.
type MuxFetchBlockResp struct {
proto.Envelope
proto.DatabaseID
FetchBlockResp
}
// AdviseNewBlock is the RPC method to advise a new produced block to the target server.
func (s *MuxService) AdviseNewBlock(req *MuxAdviseNewBlockReq, resp *MuxAdviseNewBlockResp) error {
if v, ok := s.serviceMap.Load(req.DatabaseID); ok {
resp.Envelope = req.Envelope
resp.DatabaseID = req.DatabaseID
return v.(*ChainRPCService).AdviseNewBlock(&req.AdviseNewBlockReq, &resp.AdviseNewBlockResp)
}
return ErrUnknownMuxRequest
}
// FetchBlock is the RPC method to fetch a known block from the target server.
func (s *MuxService) FetchBlock(req *MuxFetchBlockReq, resp *MuxFetchBlockResp) (err error) {
if v, ok := s.serviceMap.Load(req.DatabaseID); ok {
resp.Envelope = req.Envelope
resp.DatabaseID = req.DatabaseID
return v.(*ChainRPCService).FetchBlock(&req.FetchBlockReq, &resp.FetchBlockResp)
}
return ErrUnknownMuxRequest
}