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server.go
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server.go
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// Copyright 2022 Google LLC
//
// 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 dataplane is an implementation of the dataplane HAL API.
package dataplane
import (
"context"
"fmt"
"net"
"github.com/openconfig/lemming/dataplane/forwarding"
"github.com/openconfig/lemming/dataplane/handlers"
"github.com/openconfig/lemming/dataplane/internal/engine"
"github.com/openconfig/lemming/gnmi/oc"
"github.com/openconfig/lemming/gnmi/reconciler"
"github.com/openconfig/ygnmi/ygnmi"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/local"
gpb "github.com/openconfig/gnmi/proto/gnmi"
fwdpb "github.com/openconfig/lemming/proto/forwarding"
)
// Dataplane is an implementation of Dataplane HAL API.
type Dataplane struct {
fwdSrv *forwarding.Engine
e *engine.Engine
srv *grpc.Server
lis net.Listener
fwd fwdpb.ServiceClient
reconcilers []reconciler.Reconciler
}
// New create a new dataplane instance.
func New() (*Dataplane, error) {
data := &Dataplane{
fwdSrv: forwarding.New("engine"),
}
lis, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return nil, fmt.Errorf("failed to listen: %w", err)
}
data.lis = lis
srv := grpc.NewServer(grpc.Creds(local.NewCredentials()))
fwdpb.RegisterServiceServer(srv, data.fwdSrv)
go srv.Serve(data.lis)
return data, nil
}
// ID returns the ID of the dataplane reconciler.
func (d *Dataplane) ID() string {
return "dataplane"
}
// Start starts the HAL gRPC server and packet forwarding engine.
func (d *Dataplane) Start(ctx context.Context, c gpb.GNMIClient, target string) error {
if d.srv != nil {
return fmt.Errorf("dataplane already started")
}
fc, err := d.FwdClient()
if err != nil {
return err
}
d.fwd = fc
d.e, err = engine.New(ctx, "default", fc)
if err != nil {
return err
}
d.reconcilers = append(d.reconcilers, handlers.NewInterface(d.e), handlers.NewRoute(d.e))
for _, rec := range d.reconcilers {
if err := rec.Start(ctx, c, target); err != nil {
return fmt.Errorf("failed to stop handler %q: %v", rec.ID(), err)
}
}
return nil
}
// FwdClient gets a gRPC client to the packet forwarding engine.
func (d *Dataplane) FwdClient() (fwdpb.ServiceClient, error) {
conn, err := grpc.Dial(d.lis.Addr().String(), grpc.WithTransportCredentials(local.NewCredentials()))
if err != nil {
return nil, fmt.Errorf("failed to dial server: %w", err)
}
return fwdpb.NewServiceClient(conn), nil
}
// Stop gracefully stops the server.
func (d *Dataplane) Stop(ctx context.Context) error {
for _, rec := range d.reconcilers {
if err := rec.Stop(ctx); err != nil {
return fmt.Errorf("failed to stop handler %q: %v", rec.ID(), err)
}
}
d.srv.GracefulStop()
return nil
}
// Validate is a noop to implement to the reconciler interface.
func (d *Dataplane) Validate(*oc.Root) error {
return nil
}
// ValidationPaths is a noop to implement to the reconciler interface.
func (d *Dataplane) ValidationPaths() []ygnmi.PathStruct {
return nil
}