event handlers framework

core/event/network_bus.go

@@ -0,0 +1,76 @@
+package event
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"net/rpc"
+	"sync"
+)
+
+// NetworkBus - object capable of subscribing to remote event buses in addition to remote event
+// busses subscribing to it's local event bus. Compoed of a server and cliet
+type NetworkBus struct {
+	*Client
+	*Server
+	service   *NetworkBusService
+	sharedBus Bus
+	address   string
+	path      string
+}
+
+// NewNetworkBus - returns a new network bus object at the server address and path
+func NewNetworkBus(address, path string) *NetworkBus {
+	bus := new(NetworkBus)
+	bus.sharedBus = New()
+	bus.Server = NewServer(address, path, bus.sharedBus)
+	bus.Client = NewClient(address, path, bus.sharedBus)
+	bus.service = &NetworkBusService{&sync.WaitGroup{}, false}
+	bus.address = address
+	bus.path = path
+	return bus
+}
+
+// EventBus - returns wrapped event bus
+func (networkBus *NetworkBus) EventBus() Bus {
+	return networkBus.sharedBus
+}
+
+// NetworkBusService - object capable of serving the network bus
+type NetworkBusService struct {
+	wg      *sync.WaitGroup
+	started bool
+}
+
+// Start - helper method to serve a network bus service
+func (networkBus *NetworkBus) Start() error {
+	var err error
+	service := networkBus.service
+	clientService := networkBus.Client.service
+	serverService := networkBus.Server.service
+	if !service.started {
+		server := rpc.NewServer()
+		server.RegisterName("ServerService", serverService)
+		server.RegisterName("ClientService", clientService)
+		server.HandleHTTP(networkBus.path, "/debug"+networkBus.path)
+		l, e := net.Listen("tcp", networkBus.address)
+		if e != nil {
+			err = fmt.Errorf("listen error: %v", e)
+		}
+		service.wg.Add(1)
+		go http.Serve(l, nil)
+	} else {
+		err = errors.New("Server bus already started")
+	}
+	return err
+}
+
+// Stop - signal for the service to stop serving
+func (networkBus *NetworkBus) Stop() {
+	service := networkBus.service
+	if service.started {
+		service.wg.Done()
+		service.started = false
+	}
+}