method opcommand, embedded processes to process

example/toShip1-OpCommand.json

@@ -0,0 +1,11 @@
+[
+    {
+        
+        "toNode": "ship1",
+        "data": ["ps"],
+        "method":"OpCommand",
+        "timeout":3,
+        "retries":3,
+        "MethodTimeout": 7
+    }
+]

process.go

@@ -56,6 +56,8 @@ type process struct {
 	configuration *Configuration
 	// The new messages channel copied from *Server
 	toRingbufferCh chan<- []subjectAndMessage
+	// The structure who holds all processes information
+	processes *processes
 }
 
 // prepareNewProcess will set the the provided values and the default
@@ -83,6 +85,7 @@ func newProcess(processes *processes, toRingbufferCh chan<- []subjectAndMessage,
 		methodsAvailable: method.GetMethodsAvailable(),
 		toRingbufferCh:   toRingbufferCh,
 		configuration:    configuration,
+		processes:        processes,
 	}
 
 	return proc

read_socket.go

@@ -47,6 +47,8 @@ func (s *server) readSocket(toRingbufferCh chan []subjectAndMessage) {
 
 		// Send the SAM struct to be picked up by the ring buffer.
 		toRingbufferCh <- sam
+
+		conn.Close()
 	}
 }
 

server.go

@@ -29,12 +29,15 @@ type processes struct {
 	mu sync.RWMutex
 	// The last processID created
 	lastProcessID int
+	// metrics channel
+	metricsCh chan metricType
 }
 
 // newProcesses will prepare and return a *processes
-func newProcesses() *processes {
+func newProcesses(metricsCh chan metricType) *processes {
 	p := processes{
-		active: make(map[processName]process),
+		active:    make(map[processName]process),
+		metricsCh: metricsCh,
 	}
 
 	return &p
@@ -81,14 +84,16 @@ func NewServer(c *Configuration) (*server, error) {
 		os.Exit(1)
 	}
 
+	metrics := newMetrics(c.PromHostAndPort)
+
 	s := &server{
 		configuration:  c,
 		nodeName:       c.NodeName,
 		natsConn:       conn,
 		netListener:    nl,
-		processes:      newProcesses(),
+		processes:      newProcesses(metrics.metricsCh),
 		toRingbufferCh: make(chan []subjectAndMessage),
-		metrics:        newMetrics(c.PromHostAndPort),
+		metrics:        metrics,
 	}
 
 	// Create the default data folder for where subscribers should
@@ -129,7 +134,7 @@ func (s *server) Start() {
 	s.ProcessesStart()
 
 	time.Sleep(time.Second * 1)
-	s.printProcessesMap()
+	s.processes.printProcessesMap()
 
 	// Start the processing of new messages from an input channel.
 	s.routeMessagesToProcess("./incommmingBuffer.db", s.toRingbufferCh)
@@ -138,21 +143,21 @@ func (s *server) Start() {
 
 }
 
-func (s *server) printProcessesMap() {
+func (p *processes) printProcessesMap() {
 	fmt.Println("--------------------------------------------------------------------------------------------")
 	fmt.Printf("*** Output of processes map :\n")
-	s.processes.mu.Lock()
-	for _, v := range s.processes.active {
+	p.mu.Lock()
+	for _, v := range p.active {
 		fmt.Printf("* proc - : %v, id: %v, name: %v, allowed from: %v\n", v.processKind, v.processID, v.subject.name(), v.allowedReceivers)
 	}
-	s.processes.mu.Unlock()
+	p.mu.Unlock()
 
-	s.metrics.metricsCh <- metricType{
+	p.metricsCh <- metricType{
 		metric: prometheus.NewGauge(prometheus.GaugeOpts{
 			Name: "total_running_processes",
 			Help: "The current number of total running processes",
 		}),
-		value: float64(len(s.processes.active)),
+		value: float64(len(p.active)),
 	}
 
 	fmt.Println("--------------------------------------------------------------------------------------------")
@@ -280,7 +285,7 @@ func (s *server) routeMessagesToProcess(dbFileName string, newSAM chan []subject
 
 				// REMOVED:
 				//time.Sleep(time.Millisecond * 500)
-				s.printProcessesMap()
+				//s.printProcessesMap()
 				// Now when the process is spawned we jump back to the redo: label,
 				// and send the message to that new process.
 				goto redo

startup_processes.go

@@ -12,6 +12,14 @@ func (s *server) ProcessesStart() {
 
 	// --- Subscriber services that can be started via flags
 
+	// Start a subscriber for OPCommand messages
+	{
+		fmt.Printf("Starting OpCommand subscriber: %#v\n", s.nodeName)
+		sub := newSubject(OpCommand, CommandACK, s.nodeName)
+		proc := newProcess(s.processes, s.toRingbufferCh, s.configuration, sub, s.errorKernel.errorCh, processKindSubscriber, []node{"*"}, nil)
+		go proc.spawnWorker(s)
+	}
+
 	// Start a subscriber for CLICommand messages
 	if s.configuration.StartSubCLICommand.OK {
 		{

subscriber_method_types.go

@@ -50,6 +50,8 @@ type Method string
 // The constants that will be used throughout the system for
 // when specifying what kind of Method to send or work with.
 const (
+	// Command for client operation of the system
+	OpCommand Method = "OpCommand"
 	// Execute a CLI command in for example bash or cmd.
 	// This is a command type, so the output of the command executed
 	// will directly showed in the ACK message received.
@@ -114,6 +116,9 @@ const (
 func (m Method) GetMethodsAvailable() MethodsAvailable {
 	ma := MethodsAvailable{
 		methodhandlers: map[Method]methodHandler{
+			OpCommand: methodOpCommand{
+				commandOrEvent: CommandACK,
+			},
 			CLICommand: methodCLICommand{
 				commandOrEvent: CommandACK,
 			},
@@ -187,6 +192,41 @@ type methodHandler interface {
 	getKind() CommandOrEvent
 }
 
+// -----
+type methodOpCommand struct {
+	commandOrEvent CommandOrEvent
+}
+
+func (m methodOpCommand) getKind() CommandOrEvent {
+	return m.commandOrEvent
+}
+
+// handler to run a CLI command with timeout context. The handler will
+// return the output of the command run back to the calling publisher
+// in the ack message.
+func (m methodOpCommand) handler(proc process, message Message, node string) ([]byte, error) {
+	out := []byte{}
+
+	switch {
+	case message.Data[0] == "ps":
+		proc.processes.mu.Lock()
+		for _, v := range proc.processes.active {
+			s := fmt.Sprintf("* proc - : %v, id: %v, name: %v, allowed from: %s\n", v.processKind, v.processID, v.subject.name(), v.allowedReceivers)
+			sb := []byte(s)
+			out = append(out, sb...)
+		}
+		proc.processes.mu.Unlock()
+
+	default:
+		out = []byte("error: no such OpCommand specified: " + message.Data[0])
+		ackMsg := []byte(fmt.Sprintf("confirmed from node: %v: messageID: %v, error: %s\n---\n", node, message.ID, out))
+		return ackMsg, nil
+	}
+
+	ackMsg := []byte(fmt.Sprintf("confirmed from node: %v: messageID: %v\n---\n%s", node, message.ID, out))
+	return ackMsg, nil
+}
+
 // -----
 
 type methodCLICommand struct {
@@ -232,8 +272,6 @@ func (m methodCLICommand) handler(proc process, message Message, node string) ([
 	return ackMsg, nil
 }
 
-// -----
-
 type methodTextLogging struct {
 	commandOrEvent CommandOrEvent
 }