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commander.go
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commander.go
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package commander
import (
"bytes"
"common"
"context"
"encoding/gob"
"fmt"
"log"
"net"
"pbMessages"
"sync"
"time"
"google.golang.org/grpc"
)
var (
DebugLog bool
Commands []common.Job
Workers WorkerMap
WorkersMtx sync.Mutex
)
const workVersion = 1
type commander struct {
}
// This function implements the Hello interface
func (*commander) Hello(ctx context.Context, request *pbMessages.HelloRequest) (*pbMessages.HelloResponse, error) {
ver := request.GetVersion()
if ver == 1 {
Workers.AddWorker(request.GetIp())
}
if DebugLog {
fmt.Printf("Received Hello message from %s [%s]\n", request.GetIp(), request.GetFqdn())
}
response := &pbMessages.HelloResponse{
Version: 1,
}
return response, nil
}
// Start the HelloRequest listener
func StartHelloListener(wg *sync.WaitGroup) {
address := "0.0.0.0:50050"
lis, err := net.Listen("tcp", address)
if err != nil {
log.Fatalf("Error %v", err)
}
fmt.Printf("Herd commander is listening for HelloRequest on %v ...\n", address)
s := grpc.NewServer()
pbMessages.RegisterHelloServiceServer(s, &commander{})
s.Serve(lis)
}
// RunHearbeat responsible for sending ping (hearbeat) messages to workers
func RunHearbeat(wg *sync.WaitGroup) {
for true {
for host, _ := range Workers {
if Workers.GetStatus(host) == WORKER_ONLINE {
sent := false
retry := 0
for retry < 5 {
connStr := fmt.Sprintf("%s:50051", host)
pMessage := &pbMessages.Ping{Name: "name 1"}
sent = SendHeartbeatMessage(connStr, pMessage)
if sent {
retry = 5
} else {
time.Sleep(1 * time.Second)
}
retry += 1
}
if !sent {
Workers.AddNetError(host)
if Workers.GetNetErrors(host) > 10 {
fmt.Printf("Setting %s to OFFLINE\n", host)
Workers.SetStatus(host, WORKER_OFFLINE)
}
} else {
if Workers.GetStatus(host) == WORKER_OFFLINE {
fmt.Printf("Setting %s to ONLINE\n", host)
Workers.SetStatus(host, WORKER_ONLINE)
Workers.ResetNetError(host)
}
}
}
if Workers.GetStatus(host) == WORKER_OFFLINE {
sent := false
connStr := fmt.Sprintf("%s:50051", host)
pMessage := &pbMessages.Ping{Name: "name 1"}
sent = SendHeartbeatMessage(connStr, pMessage)
if sent {
fmt.Printf("Setting %s to ONLINE\n", host)
Workers.SetStatus(host, WORKER_ONLINE)
Workers.ResetNetError(host)
}
}
}
time.Sleep(2 * time.Second)
}
}
func SendHeartbeatMessage(connString string, message *pbMessages.Ping) bool {
opts := grpc.WithInsecure()
cc, err := grpc.Dial(connString, opts)
if err != nil {
if DebugLog {
log.Printf("gRPC dial error: %v\n", err)
}
return false
}
defer cc.Close()
networkclient := pbMessages.NewHeartbeatServiceClient(cc)
response, err := networkclient.Heartbeat(context.Background(), message)
if err != nil {
if DebugLog {
log.Printf("SendHeartbeatMessage() failed: %v\n", err)
}
return false
} else {
if response != nil {
if DebugLog {
fmt.Printf("Sent 'Ping' to 'Heartbeat' service, received 'Pong'\n")
}
}
}
cc.Close()
return true
}
// RunWorkSender is responsible for sending out work units to workers
func RunWorkSender(wg *sync.WaitGroup) {
for true {
if len(Commands) > 0 {
for host, _ := range Workers {
// For each host we know about
if Workers.GetNetErrors(host) > 10 {
continue
}
// if node is online, try and send
if Workers.GetStatus(host) == WORKER_ONLINE {
sent := false
retry := 0
for retry < 5 {
connStr := fmt.Sprintf("%s:50052", host)
// construct the job struct
var job common.Job
job.Command = "ls"
job.Args = append(job.Args, "-l")
job.Status = common.WAITING
// serialise the struct into buffer
var buffer bytes.Buffer
enc := gob.NewEncoder(&buffer)
err := enc.Encode(job)
if err != nil {
log.Println("encode error:", err)
}
// turn buffer into []byte for protocol buffers message
jobdata := buffer.Bytes()
//construct the message and send
pMessage := &pbMessages.WorkRequest{JobID: 1, Job: jobdata}
sent = SendWorkMessage(connStr, pMessage)
if sent {
retry = 5
} else {
Workers.AddNetError(host)
time.Sleep(1 * time.Second)
}
retry += 1
}
}
}
time.Sleep(10 * time.Second)
}
time.Sleep(5 * time.Second)
}
}
func SendWorkMessage(connString string, message *pbMessages.WorkRequest) bool {
opts := grpc.WithInsecure()
cc, err := grpc.Dial(connString, opts)
if err != nil {
if DebugLog {
log.Printf("gRPC dial error: %v\n", err)
}
return false
}
defer cc.Close()
networkclient := pbMessages.NewWorkServiceClient(cc)
response, err := networkclient.Work(context.Background(), message)
if err != nil {
if DebugLog {
log.Printf("SendWorkMessage() failed: %v\n", err)
}
return false
} else {
if response != nil {
if DebugLog {
fmt.Printf("Sent 'WorkRequest' to 'Work' service, received 'WorkResponse'\n")
fmt.Printf("WorkResponse.Output:\n%v\n", response.Output)
}
}
}
cc.Close()
return true
}