code-health: update request type constant name

Modern Tarantool documentation uses IPROTO_REQUEST_TYPE name for request
type instead of IPROTO_CODE [1].

1. https://www.tarantool.io/en/doc/latest/dev_guide/internals/box_protocol/

Part of #206

Author: DifferentialOrange

Diff for: tarantool/const.py

@@ -1,6 +1,6 @@
 # pylint: disable=C0301,W0105,W0401,W0614
 
-IPROTO_CODE = 0x00
+IPROTO_REQUEST_TYPE = 0x00
 IPROTO_SYNC = 0x01
 # replication keys (header)
 IPROTO_SERVER_ID = 0x02

Diff for: tarantool/request.py

@@ -13,7 +13,7 @@
 
 from tarantool.error import DatabaseError
 from tarantool.const import (
-    IPROTO_CODE,
+    IPROTO_REQUEST_TYPE,
     IPROTO_SYNC,
     IPROTO_SPACE_ID,
     IPROTO_INDEX_ID,
@@ -161,7 +161,7 @@ def header(self, length):
         """
 
         self._sync = self.conn.generate_sync()
-        header = self._dumps({IPROTO_CODE: self.request_type,
+        header = self._dumps({IPROTO_REQUEST_TYPE: self.request_type,
                               IPROTO_SYNC: self._sync,
                               IPROTO_SCHEMA_ID: self.conn.schema_version})
 
@@ -259,7 +259,7 @@ def header(self, length):
         self._sync = self.conn.generate_sync()
         # Set IPROTO_SCHEMA_ID: 0 to avoid SchemaReloadException
         # It is ok to use 0 in auth every time.
-        header = self._dumps({IPROTO_CODE: self.request_type,
+        header = self._dumps({IPROTO_REQUEST_TYPE: self.request_type,
                               IPROTO_SYNC: self._sync,
                               IPROTO_SCHEMA_ID: 0})
 
@@ -618,7 +618,7 @@ def __init__(self, conn, sync):
         """
 
         super(RequestOK, self).__init__(conn)
-        request_body = self._dumps({IPROTO_CODE: self.request_type,
+        request_body = self._dumps({IPROTO_REQUEST_TYPE: self.request_type,
                                     IPROTO_SYNC: sync})
         self._body = request_body
 

Diff for: tarantool/response.py

@@ -9,7 +9,7 @@
 import msgpack
 
 from tarantool.const import (
-    IPROTO_CODE,
+    IPROTO_REQUEST_TYPE,
     IPROTO_DATA,
     IPROTO_ERROR,
     IPROTO_SYNC,
@@ -93,7 +93,7 @@ def __init__(self, conn, response):
 
         self.conn = conn
         self._sync = header.get(IPROTO_SYNC, 0)
-        self._code = header[IPROTO_CODE]
+        self._code = header[IPROTO_REQUEST_TYPE]
         self._body = {}
         self._schema_version = header.get(IPROTO_SCHEMA_ID, None)
         try: