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grpc_protocol.go
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/
grpc_protocol.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 grpc
import (
"strconv"
"sync"
)
import (
"github.com/dubbogo/gost/log/logger"
)
import (
"dubbo.apache.org/dubbo-go/v3/common"
"dubbo.apache.org/dubbo-go/v3/common/constant"
"dubbo.apache.org/dubbo-go/v3/common/extension"
"dubbo.apache.org/dubbo-go/v3/protocol"
)
const (
// GRPC module name
GRPC = "grpc"
)
func init() {
extension.SetProtocol(GRPC, GetProtocol)
}
var grpcProtocol *GrpcProtocol
// GrpcProtocol is gRPC protocol
type GrpcProtocol struct {
protocol.BaseProtocol
serverMap map[string]*Server
serverLock sync.Mutex
}
// NewGRPCProtocol creates new gRPC protocol
func NewGRPCProtocol() *GrpcProtocol {
return &GrpcProtocol{
BaseProtocol: protocol.NewBaseProtocol(),
serverMap: make(map[string]*Server),
}
}
// Export gRPC service for remote invocation
func (gp *GrpcProtocol) Export(invoker protocol.Invoker) protocol.Exporter {
url := invoker.GetURL()
serviceKey := url.ServiceKey()
exporter := NewGrpcExporter(serviceKey, invoker, gp.ExporterMap())
gp.SetExporterMap(serviceKey, exporter)
logger.Infof("[GRPC Protocol] Export service: %s", url.String())
gp.openServer(url)
return exporter
}
func (gp *GrpcProtocol) openServer(url *common.URL) {
gp.serverLock.Lock()
defer gp.serverLock.Unlock()
if _, ok := gp.serverMap[url.Location]; ok {
return
}
if _, ok := gp.ExporterMap().Load(url.ServiceKey()); !ok {
panic("[GrpcProtocol]" + url.Key() + "is not existing")
}
grpcMessageSize, _ := strconv.Atoi(url.GetParam(constant.MessageSizeKey, "4"))
srv := NewServer()
srv.SetBufferSize(grpcMessageSize)
gp.serverMap[url.Location] = srv
srv.Start(url)
}
// Refer a remote gRPC service
func (gp *GrpcProtocol) Refer(url *common.URL) protocol.Invoker {
client, err := NewClient(url)
if err != nil {
logger.Warnf("can't dial the server: %s", url.Key())
return nil
}
invoker := NewGrpcInvoker(url, client)
gp.SetInvokers(invoker)
logger.Infof("[GRPC Protcol] Refer service: %s", url.String())
return invoker
}
// Destroy will destroy gRPC all invoker and exporter, so it only is called once.
func (gp *GrpcProtocol) Destroy() {
logger.Infof("GrpcProtocol destroy.")
gp.serverLock.Lock()
defer gp.serverLock.Unlock()
for key, server := range gp.serverMap {
delete(gp.serverMap, key)
server.GracefulStop()
}
gp.BaseProtocol.Destroy()
}
// GetProtocol gets gRPC protocol, will create if null.
func GetProtocol() protocol.Protocol {
if grpcProtocol == nil {
grpcProtocol = NewGRPCProtocol()
}
return grpcProtocol
}