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worker.go
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worker.go
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package worker
import (
"bytes"
"common"
"context"
"encoding/gob"
"fmt"
"log"
"net"
"os/exec"
"sync"
"time"
"pbMessages"
"google.golang.org/grpc"
)
var (
DebugLog bool
)
const helloVersion = 1
type worker struct {
}
func (*worker) Heartbeat(ctx context.Context, request *pbMessages.Ping) (*pbMessages.Pong, error) {
name := request.GetName()
response := &pbMessages.Pong{
Name: name,
}
return response, nil
}
func (*worker) Work(ctx context.Context, request *pbMessages.WorkRequest) (*pbMessages.WorkResponse, error) {
// job data is []byte, but needs to be bytes.buffer for deserialisation
byteData := request.GetJob()
// create bytes.buffer
buffer := bytes.NewBuffer(byteData)
// deserialise into job struct
decoder := gob.NewDecoder(buffer)
var job common.Job
err := decoder.Decode(&job)
if err != nil {
fmt.Printf("gob decode error: %v", err)
}
response := &pbMessages.WorkResponse{
Output: executeCmd(job.Command, job.Args),
}
return response, nil
}
func RunHelloProtocol(server string, wg *sync.WaitGroup) {
for true {
localAddr := common.GetOutboundIP(server)
connStr := fmt.Sprintf("%s:50050", server)
sent := false
pMessage := &pbMessages.HelloRequest{Version: 1, Ip: localAddr}
sent = SendHelloMessage(connStr, pMessage)
if !sent {
log.Println("Sending HelloRequest failed.")
}
time.Sleep(20 * time.Second)
}
}
func SendHelloMessage(connString string, message *pbMessages.HelloRequest) bool {
opts := grpc.WithInsecure()
cc, err := grpc.Dial(connString, opts)
if err != nil {
log.Printf("gRPC dial error: %v\n", err)
return false
}
defer cc.Close()
networkclient := pbMessages.NewHelloServiceClient(cc)
response, err := networkclient.Hello(context.Background(), message)
if err != nil {
log.Printf("SendHelloMessage() failed: %v\n", err)
return false
} else {
if response != nil {
if DebugLog {
fmt.Printf("Sent 'HelloRequest' to 'Hello' service, received 'HelloResponse'\n")
}
}
}
cc.Close()
return true
}
func StartHeartbeatListener(wg *sync.WaitGroup) {
address := "0.0.0.0:50051"
lis, err := net.Listen("tcp", address)
if err != nil {
log.Printf("ERROR: %v\n", err)
}
fmt.Printf("Herd worker is listening on %v ...\n", address)
s := grpc.NewServer()
pbMessages.RegisterHeartbeatServiceServer(s, &worker{})
s.Serve(lis)
}
func StartWorkerListener(wg *sync.WaitGroup) {
address := "0.0.0.0:50052"
lis, err := net.Listen("tcp", address)
if err != nil {
log.Printf("ERROR: %v\n", err)
}
fmt.Printf("Herd worker is listening on %v ...\n", address)
s := grpc.NewServer()
pbMessages.RegisterWorkServiceServer(s, &worker{})
s.Serve(lis)
}
func executeCmd(cmdstr string, args []string) string {
cmd := exec.Command(cmdstr)
if DebugLog {
fmt.Printf("cmd string: %s\n", cmdstr)
}
//cmd.Stdin = strings.NewReader("some input")
var out bytes.Buffer
cmd.Stdout = &out
err := cmd.Run()
if err != nil {
log.Printf("CMD ERROR: %v\n", err)
}
return out.String()
}