From 5e7ea80809d43d0aba79c38a95ceda4a398581fe Mon Sep 17 00:00:00 2001
From: Ethan Heilman <ethan@geographicslab.org>
Date: Wed, 31 Dec 2014 18:01:31 -0500
Subject: [PATCH] Fixing bug where to_bytes clobbers testnet params.  [
 yapified by gitreformat (github/ghtdak) on Mon Nov 30 21:11:38 2015 ]

---
 bitcoin/messages.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/bitcoin/messages.py b/bitcoin/messages.py
index 456c1fcc..3e33f58b 100644
--- a/bitcoin/messages.py
+++ b/bitcoin/messages.py
@@ -33,7 +33,7 @@
 from bitcoin.core import *
 from bitcoin.core.serialize import *
 from bitcoin.net import *
-from bitcoin import MainParams
+import bitcoin
 
 MSG_TX = 1
 MSG_BLOCK = 2
@@ -52,11 +52,11 @@ def msg_ser(self, f):
     def msg_deser(cls, f, protover=PROTO_VERSION):
         raise NotImplementedError
 
-    def to_bytes(self, params=MainParams()):
+    def to_bytes(self):
         f = _BytesIO()
         self.msg_ser(f)
         body = f.getvalue()
-        res = params.MESSAGE_START
+        res = bitcoin.params.MESSAGE_START
         res += self.command
         res += b"\x00" * (12 - len(self.command))
         res += struct.pack(b"<I", len(body))
@@ -75,13 +75,14 @@ def from_bytes(cls, b, protover=PROTO_VERSION):
         return MsgSerializable.stream_deserialize(f, protover=protover)
 
     @classmethod
-    def stream_deserialize(cls, f, params=MainParams(), protover=PROTO_VERSION):
+    def stream_deserialize(cls, f, protover=PROTO_VERSION):
         recvbuf = ser_read(f, 4 + 12 + 4 + 4)
 
         # check magic
-        if recvbuf[:4] != params.MESSAGE_START:
-            raise ValueError("Invalid message start '%s', expected '%s'" %
-                             (b2x(recvbuf[:4]), b2x(params.MESSAGE_START)))
+        if recvbuf[:4] != bitcoin.params.MESSAGE_START:
+            raise ValueError(
+                "Invalid message start '%s', expected '%s'" %
+                (b2x(recvbuf[:4]), b2x(bitcoin.params.MESSAGE_START)))
 
         # remaining header fields: command, msg length, checksum
         command = recvbuf[4:4 + 12].split(b"\x00", 1)[0]