Support msgpack-1.0.0 (unpacking part)

msgpack-1.0.0 changes default value of 'raw' and 'strict_map_key'
options. We should handle different versions of the library and provide
the same behaviour across them.

This version of the msgpack library also drops support of 'encoding'
option. We already use raw=True/False msgpack option to implement
encoding=None/'utf-8' connector option, so the only change we should do
about this is to explicitly forbid other encoding values. Unlikely using
of text encodings other than UTF-8 is popular.

Part of #155

tarantool/connection.py

@@ -52,6 +52,7 @@
     NetworkError,
     DatabaseError,
     InterfaceError,
+    ConfigurationError,
     SchemaError,
     NetworkWarning,
     SchemaReloadException,
@@ -79,6 +80,7 @@ class Connection(object):
     Error = tarantool.error
     DatabaseError = DatabaseError
     InterfaceError = InterfaceError
+    ConfigurationError = ConfigurationError
     SchemaError = SchemaError
     NetworkError = NetworkError
 
@@ -101,6 +103,11 @@ def __init__(self, host, port,
         creates network connection.
                              if False than you have to call connect() manualy.
         '''
+
+        if msgpack.version >= (1, 0, 0) and encoding not in (None, 'utf-8'):
+            raise ConfigurationError("Only None and 'utf-8' encoding option " +
+                                     "values are supported with msgpack>=1.0.0")
+
         if os.name == 'nt':
             libc = ctypes.WinDLL(
                 ctypes.util.find_library('Ws2_32'), use_last_error=True

tarantool/response.py

@@ -64,6 +64,23 @@ def __init__(self, conn, response):
         elif conn.encoding is not None:
             unpacker_kwargs['encoding'] = conn.encoding
 
+        # raw=False is default since msgpack-1.0.0.
+        #
+        # The option decodes mp_str to bytes, not a Unicode
+        # string (when True).
+        if msgpack.version >= (1, 0, 0) and conn.encoding is None:
+            unpacker_kwargs['raw'] = True
+
+        # encoding option is not supported since msgpack-1.0.0,
+        # but it is handled in the Connection constructor.
+        assert(msgpack.version < (1, 0, 0) or conn.encoding in (None, 'utf-8'))
+
+        # strict_map_key=True is default since msgpack-1.0.0.
+        #
+        # The option forbids non-string keys in a map (when True).
+        if msgpack.version >= (1, 0, 0):
+            unpacker_kwargs['strict_map_key'] = False
+
         unpacker = msgpack.Unpacker(**unpacker_kwargs)
 
         unpacker.feed(response)