Fix visualizations.

Turns out that stream_info/recvsize contains a string, not an int.

onionperf/visualization.py

@@ -70,12 +70,12 @@ class TGenVisualization(Visualization):
                                      stream["time_to_last_byte"] = float(s["usecs-to-last-byte-recv"])/1000000
                              if "elapsed_seconds" in stream_data:
                                  s = stream_data["elapsed_seconds"]
-                                 # Explanation of the math below for computing Mbps: From filesize_bytes
-                                 # and payload_progress fields we can compute the number of seconds that
+                                 # Explanation of the math below for computing Mbps: From stream_info/recvsize
+                                 # and payload_progress_recv fields we can compute the number of seconds that
                                  # have elapsed between receiving bytes 524,288 and 1,048,576, which is a
                                  # total amount of 524,288 bytes or 4,194,304 bits or 4.194304 megabits.
                                  # We want the reciprocal of that value with unit megabits per second.
-                                 if stream_data["stream_info"]["recvsize"] == 5242880 and "0.2" in s["payload_progress_recv"]:
+                                 if stream_data["stream_info"]["recvsize"] == "5242880" and "0.2" in s["payload_progress_recv"]:
                                       stream["mbps"] = 4.194304 / (s["payload_progress_recv"]["0.2"] - s["payload_progress_recv"]["0.1"])
                              if "error" in stream_data["transport_info"] and stream_data["transport_info"]["error"] != "NONE":
                                  stream["error_code"] = stream_data["transport_info"]["error"]