added comms http

rpc/comms/http.go

@@ -0,0 +1,65 @@
+package comms
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/rpc/api"
+	"github.com/ethereum/go-ethereum/rpc/codec"
+	"github.com/rs/cors"
+)
+
+var (
+	// main HTTP rpc listener
+	httpListener         *stoppableTCPListener
+	listenerStoppedError = fmt.Errorf("Listener has stopped")
+)
+
+type HttpConfig struct {
+	ListenAddress string
+	ListenPort    uint
+	CorsDomain    string
+}
+
+func StartHttp(cfg HttpConfig, codec codec.Codec, apis ...api.EthereumApi) error {
+	if httpListener != nil {
+		if fmt.Sprintf("%s:%d", cfg.ListenAddress, cfg.ListenPort) != httpListener.Addr().String() {
+			return fmt.Errorf("RPC service already running on %s ", httpListener.Addr().String())
+		}
+		return nil // RPC service already running on given host/port
+	}
+
+	l, err := newStoppableTCPListener(fmt.Sprintf("%s:%d", cfg.ListenAddress, cfg.ListenPort))
+	if err != nil {
+		glog.V(logger.Error).Infof("Can't listen on %s:%d: %v", cfg.ListenAddress, cfg.ListenPort, err)
+		return err
+	}
+	httpListener = l
+
+	api := api.Merge(apis...)
+	var handler http.Handler
+	if len(cfg.CorsDomain) > 0 {
+		var opts cors.Options
+		opts.AllowedMethods = []string{"POST"}
+		opts.AllowedOrigins = strings.Split(cfg.CorsDomain, " ")
+
+		c := cors.New(opts)
+		handler = newStoppableHandler(c.Handler(gethHttpHandler(codec, api)), l.stop)
+	} else {
+		handler = newStoppableHandler(gethHttpHandler(codec, api), l.stop)
+	}
+
+	go http.Serve(l, handler)
+
+	return nil
+}
+
+func StopHttp() {
+	if httpListener != nil {
+		httpListener.Stop()
+		httpListener = nil
+	}
+}