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composite.go
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composite.go
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// Copyright (c) 2019 Cisco and/or its affiliates.
//
// 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 common
import (
"context"
"github.com/networkservicemesh/networkservicemesh/pkg/tools/spanhelper"
"github.com/golang/protobuf/ptypes/empty"
"github.com/opentracing/opentracing-go"
"github.com/networkservicemesh/networkservicemesh/controlplane/api/connection"
"github.com/networkservicemesh/networkservicemesh/controlplane/api/networkservice"
)
// CompositeNetworkService is the base service composition struct
type CompositeNetworkService struct {
services []networkservice.NetworkServiceServer
factoryName string
}
// Request implements a dummy request handler
func (cns *CompositeNetworkService) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*connection.Connection, error) {
if len(cns.services) == 0 {
return request.Connection, nil
}
ctx = WithNext(ctx, &nextEndpoint{factoryName: cns.factoryName, composite: cns, index: 0})
if opentracing.IsGlobalTracerRegistered() {
ctx = WithOriginalSpan(ctx, spanhelper.GetSpanHelper(ctx))
}
return cns.services[0].Request(ctx, request)
}
// Close implements a dummy close handler
func (cns *CompositeNetworkService) Close(ctx context.Context, connection *connection.Connection) (*empty.Empty, error) {
if len(cns.services) == 0 {
return &empty.Empty{}, nil
}
ctx = WithNext(ctx, &nextEndpoint{composite: cns, index: 0})
return cns.services[0].Close(ctx, connection)
}
// NewCompositeService creates a new composed endpoint
func NewCompositeService(factoryName string, services ...networkservice.NetworkServiceServer) networkservice.NetworkServiceServer {
return &CompositeNetworkService{
factoryName: factoryName,
services: services,
}
}