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package gnmitarget
import (
"crypto/tls"
"crypto/x509"
"net"
"os"
"reflect"
"code.fbi.h-da.de/danet/gnmi-target/handler"
server "code.fbi.h-da.de/danet/gnmi-target/internal/gnmiserver"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/reflection"
not "code.fbi.h-da.de/danet/gnmi-target/internal/notifications"
pbGNMI "github.com/openconfig/gnmi/proto/gnmi"
"github.com/openconfig/ygot/ygot"
"github.com/openconfig/ygot/ytypes"
log "github.com/sirupsen/logrus"
)
type Logic interface {
Init() (ygot.ValidatedGoStruct, error)
Callback(newConfig, existingConfig ygot.ValidatedGoStruct) error
}
// GnmiTarget is a gnmi target that can be run on a operating system.
type GnmiTarget struct {
model ygot.ValidatedGoStruct
modeldata []*pbGNMI.ModelData
schema *ytypes.Schema
unmarshalFn func(data []byte, destStruct ygot.GoStruct, opts ...ytypes.UnmarshalOpt) error
ΛEnum map[string]map[int64]ygot.EnumDefinition
YangModelChangeDispatcher *not.Dispatcher
yangHandlers []handler.PathHandler
}
func NewGnmiTarget(
schema *ytypes.Schema,
model ygot.ValidatedGoStruct,
modeldata []*pbGNMI.ModelData,
unmarshalFn func(data []byte, destStruct ygot.GoStruct, opts ...ytypes.UnmarshalOpt) error,
ΛEnum map[string]map[int64]ygot.EnumDefinition,
yangHandlers ...handler.PathHandler,
) *GnmiTarget {
return &GnmiTarget{
schema: schema,
model: model,
modeldata: modeldata,
unmarshalFn: unmarshalFn,
ΛEnum: ΛEnum,
YangModelChangeDispatcher: not.NewDispatcher(),
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yangHandlers: yangHandlers,
}
}
func (gt *GnmiTarget) Start(bindAddress string, certFile string, keyFile string, caFile string, insecure bool) error {
//TODO: check if gt has been initialized correctly
gnmiModel := server.NewModel(gt.modeldata,
// NOTE: could be problematic
reflect.TypeOf(gt.model),
gt.schema.RootSchema(),
gt.unmarshalFn,
gt.ΛEnum)
// Check and display supported YANG models, abort if none.
log.Info("Supported YANG models:\n")
if len(gnmiModel.SupportedModels()) == 0 {
log.Fatal("None YANG models supported -- abort")
} else {
for _, m := range gnmiModel.SupportedModels() {
log.Info(m)
}
}
for _, handler := range gt.yangHandlers {
if err := handler.Init(gt.model); err != nil {
log.Fatalf("error in initializing GNMI target through handlers: %v", err)
}
}
gnmiServer, err := server.NewServer(gnmiModel, gt.model, gt.YangModelChangeDispatcher, gt.yangHandlers...)
if err != nil {
log.Fatalf("error in creating GNMI target: %v", err)
}
var grpcServer *grpc.Server
if insecure == false {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
log.Fatalf("error in loading server certificate: %v", err)
}
ca, err := os.ReadFile(caFile)
pool := x509.NewCertPool()
if !pool.AppendCertsFromPEM(ca) {
log.Fatalf("error in appending ca certificate: %v", err)
}
tlsConfig := &tls.Config{
// activate mTLS
ClientAuth: tls.RequireAndVerifyClientCert,
Certificates: []tls.Certificate{cert},
ClientCAs: pool,
}
transportCredentials := credentials.NewTLS(tlsConfig)
// Create new GRPC Server without service registered
grpcServer = grpc.NewServer(grpc.Creds(transportCredentials))
} else {
log.Infof("\n\n*****WARNING*********WARNING*****\nStarting without secured gnmi server!\nAll gnmi transmissions are unencrypted\n*****WARNING*********WARNING*****\n\n")
// Create new GRPC Server without service registered
grpcServer = grpc.NewServer()
}
// Register GNMI Server
pbGNMI.RegisterGNMIServer(grpcServer, gnmiServer)
reflection.Register(grpcServer)
// Start Server
log.Infof("Starting gnmi-target server to listen on %s", bindAddress)
listener, err := net.Listen("tcp", bindAddress)
if err != nil {
log.Fatalf("Failed to list due to: %v", err)
}
log.Info("gnmi-target is ready to serve requests.")
err = grpcServer.Serve(listener)
if err != nil {
log.Fatalf("Failed to serve requests due to: %v", err)
}
return nil
}