scripts/rpc: support sending multiple requests

This will allow testing notifications code where user will most likely
issue many requests and socket buffereing might just squash them into
one packet.

Note that multiple requests are not send in batch mode.

Change-Id: Icfa4bfe21ff1268796bc41cf0443737f260b6040
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/436529
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

scripts/rpc/client.py

@@ -3,6 +3,7 @@ import socket
 import time
 import os
 import logging
+import copy
 
 
 def print_dict(d):
@@ -64,7 +65,7 @@ class JSONRPCClient(object):
         if getattr(self, "sock", None):
             self.sock.close()
 
-    def send(self, method, params=None):
+    def add_request(self, method, params):
         self._request_id += 1
         req = {
             'jsonrpc': '2.0',
@@ -73,12 +74,22 @@ class JSONRPCClient(object):
         }
 
         if params:
-            req['params'] = params
+            req['params'] = copy.deepcopy(params)
 
-        reqstr = json.dumps(req,  indent=2)
-        self._logger.info("request:\n%s\n", reqstr)
+        self._logger.debug("append request:\n%s\n", json.dumps(req))
+        self._reqs.append(req)
+
+    def flush(self):
+        self._logger.debug("Flushing buffer")
+        # TODO: We can drop indent parameter
+        reqstr = "\n".join(json.dumps(req, indent=2) for req in self._reqs)
+        self._reqs = []
+        self._logger.info("Requests:\n%s\n", reqstr)
         self.sock.sendall(reqstr.encode("utf-8"))
-        return req
+
+    def send(self, method, params=None):
+        self.add_request(method, params)
+        self.flush()
 
     def decode_one_response(self):
         try: