Revert "delete everything" (includes everything non-go-crypto)

This reverts commit 96a3502

rpc/grpc/client_server.go

@@ -0,0 +1,44 @@
+package core_grpc
+
+import (
+	"fmt"
+	"net"
+	"strings"
+	"time"
+
+	"google.golang.org/grpc"
+
+	cmn "github.com/tendermint/tmlibs/common"
+)
+
+// Start the grpcServer in a go routine
+func StartGRPCServer(protoAddr string) (net.Listener, error) {
+	parts := strings.SplitN(protoAddr, "://", 2)
+	if len(parts) != 2 {
+		return nil, fmt.Errorf("Invalid listen address for grpc server (did you forget a tcp:// prefix?) : %s", protoAddr)
+	}
+	proto, addr := parts[0], parts[1]
+	ln, err := net.Listen(proto, addr)
+	if err != nil {
+		return nil, err
+	}
+
+	grpcServer := grpc.NewServer()
+	RegisterBroadcastAPIServer(grpcServer, &broadcastAPI{})
+	go grpcServer.Serve(ln) // nolint: errcheck
+
+	return ln, nil
+}
+
+// Start the client by dialing the server
+func StartGRPCClient(protoAddr string) BroadcastAPIClient {
+	conn, err := grpc.Dial(protoAddr, grpc.WithInsecure(), grpc.WithDialer(dialerFunc))
+	if err != nil {
+		panic(err)
+	}
+	return NewBroadcastAPIClient(conn)
+}
+
+func dialerFunc(addr string, timeout time.Duration) (net.Conn, error) {
+	return cmn.Connect(addr)
+}