feat(): Initial commit for slicegw edge server

Signed-off-by: Bharath Horatti <[email protected]>

Dockerfile

@@ -0,0 +1,63 @@
+##########################################################
+#Dockerfile
+#Copyright (c) 2022 Avesha, Inc. All rights reserved.
+#
+#SPDX-License-Identifier: Apache-2.0
+#
+#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.
+##########################################################
+
+FROM amd64/golang:1.21.0-alpine3.17 as gobuilder
+
+# Install git.
+
+# Git is required for fetching the dependencies.
+
+RUN apk update && apk add --no-cache git make build-base
+
+# Set the Go source path
+
+WORKDIR /
+
+COPY . .
+
+# Build the binary.
+
+RUN go mod download &&\
+    go env -w GOPRIVATE=github.com/kubeslice && \
+    CGO_ENABLED=1 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o bin/kubeslice-gateway-edge main.go
+
+
+# Build reduced image from base alpine
+
+FROM amd64/alpine:3.15
+
+# tc - is needed for traffic control and shaping on the sidecar.  it is part of the iproute2
+
+RUN apk add --no-cache ca-certificates \
+    iproute2
+
+RUN apk add --no-cache ca-certificates \
+    iptables
+
+# Copy our static executable.
+
+COPY --from=gobuilder bin/kubeslice-gateway-edge .
+
+EXPOSE 5000
+
+EXPOSE 8080
+
+# Or could be CMD
+
+ENTRYPOINT ["./kubeslice-gateway-edge"]

go.mod

@@ -0,0 +1,26 @@
+module github.com/kubeslice/slicegw-edge
+
+go 1.21
+
+require (
+	github.com/coreos/go-iptables v0.7.0
+	github.com/lorenzosaino/go-sysctl v0.3.1
+	go.uber.org/zap v1.25.0
+	google.golang.org/grpc v1.58.0
+	google.golang.org/protobuf v1.31.0
+)
+
+require (
+	github.com/BurntSushi/toml v1.1.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	go.uber.org/multierr v1.10.0 // indirect
+	golang.org/x/exp/typeparams v0.0.0-20220613132600-b0d781184e0d // indirect
+	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 // indirect
+	golang.org/x/mod v0.8.0 // indirect
+	golang.org/x/net v0.12.0 // indirect
+	golang.org/x/sys v0.10.0 // indirect
+	golang.org/x/text v0.11.0 // indirect
+	golang.org/x/tools v0.6.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 // indirect
+	honnef.co/go/tools v0.3.2 // indirect
+)

go.sum

@@ -0,0 +1,66 @@
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main.go

@@ -0,0 +1,103 @@
+/*  Copyright (c) 2022 Avesha, Inc. All rights reserved.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  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 main
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+
+	"github.com/kubeslice/slicegw-edge/pkg/edgeservice"
+	"github.com/kubeslice/slicegw-edge/pkg/logger"
+
+	sysctl "github.com/lorenzosaino/go-sysctl"
+	"google.golang.org/grpc"
+)
+
+var (
+	log *logger.Logger = logger.NewLogger()
+)
+
+func startGrpcServer(grpcPort string) error {
+	address := fmt.Sprintf(":%s", grpcPort)
+	log.Infof("Starting GRPC Server for SliceGw-Edge Pod at %v", address)
+
+	ln, err := net.Listen("tcp", address)
+	if err != nil {
+		log.Errorf("Unable to listen on address: %v, err: %v", address, err.Error())
+		return err
+	}
+
+	srv := grpc.NewServer()
+	edgeservice.RegisterGwEdgeServiceServer(srv, &edgeservice.GwEdgeService{})
+
+	err = srv.Serve(ln)
+	if err != nil {
+		log.Errorf("Failed to start GRPC server: %v", err.Error())
+		return err
+	}
+
+	log.Infof("GRPC Server is exiting...")
+
+	return nil
+}
+
+// shutdownHandler triggers application shutdown.
+func shutdownHandler(wg *sync.WaitGroup) {
+	// signChan channel is used to transmit signal notifications.
+	signChan := make(chan os.Signal, 1)
+	// Catch and relay certain signal(s) to signChan channel.
+	signal.Notify(signChan, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
+
+	// Blocking until a signal is sent over signChan channel. Progress to
+	// next line after signal
+	sig := <-signChan
+	log.Infof("Teardown started with ", sig, "signal")
+
+	wg.Done()
+}
+
+func main() {
+	var grpcPort string = "5000"
+
+	// Get value of a net.ipv4.ip_forward using sysctl
+	val, err := sysctl.Get("net.ipv4.ip_forward")
+	if err != nil {
+		log.Fatalf("Retrive of ipv4.ip_forward errored %v", err)
+	}
+	if val != "1" {
+		// Set value of a net.ipv4.ip_forward to 1 using sysctl
+		err = sysctl.Set("net.ipv4.ip_forward", "1")
+		if err != nil {
+			log.Fatalf("Set of ipv4.ip_forward errored %v", err)
+		}
+	}
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	// Start the GRPC Server to communicate with slice controller.
+	go startGrpcServer(grpcPort)
+
+	go shutdownHandler(wg)
+
+	wg.Wait()
+	log.Infof("Slice Gateway Edge Server is exiting")
+}