Fix exception on bytearray object passed to data_received callback

picows/picows.pyx

@@ -136,6 +136,23 @@ cdef void _mask_payload(uint8_t* input, size_t input_len, uint32_t mask) noexcep
         input[i] ^= mask_buf[i]
 
 
+cdef _unpack_bytes_like(object bytes_like_obj, char** msg_ptr_out, Py_ssize_t* msg_size_out):
+    cdef Py_buffer msg_buffer
+
+    if PyBytes_CheckExact(bytes_like_obj):
+        msg_ptr_out[0] = PyBytes_AS_STRING(bytes_like_obj)
+        msg_size_out[0] = PyBytes_GET_SIZE(bytes_like_obj)
+    elif PyByteArray_CheckExact(bytes_like_obj):
+        msg_ptr_out[0] = PyByteArray_AS_STRING(bytes_like_obj)
+        msg_size_out[0] = PyByteArray_GET_SIZE(bytes_like_obj)
+    else:
+        PyObject_GetBuffer(bytes_like_obj, &msg_buffer, PyBUF_SIMPLE)
+        msg_ptr_out[0] = <char*>msg_buffer.buf
+        msg_size_out[0] = msg_buffer.len
+        # We can already release because we still keep the reference to the message
+        PyBuffer_Release(&msg_buffer)
+
+
 @cython.no_gc
 @cython.freelist(64)
 cdef class WSFrame:
@@ -402,25 +419,14 @@ cdef class WSTransport:
             is compressed.        
         """
         cdef:
-            Py_buffer msg_buffer
             char* msg_ptr
             Py_ssize_t msg_length
 
         if message is None:
             msg_ptr = b""
             msg_length = 0
-        elif PyBytes_CheckExact(message):
-            msg_ptr = PyBytes_AS_STRING(message)
-            msg_length = PyBytes_GET_SIZE(message)
-        elif PyByteArray_CheckExact(message):
-            msg_ptr = PyByteArray_AS_STRING(message)
-            msg_length = PyByteArray_GET_SIZE(message)
         else:
-            PyObject_GetBuffer(message, &msg_buffer, PyBUF_SIMPLE)
-            msg_ptr = <char*>msg_buffer.buf
-            msg_length = msg_buffer.len
-            # We can already release because we still keep the reference to the message
-            PyBuffer_Release(&msg_buffer)
+            _unpack_bytes_like(message, &msg_ptr, &msg_length)
 
         cdef:
             uint8_t first_byte = <uint8_t>msg_type
@@ -761,10 +767,12 @@ cdef class WSProtocol:
         if self.listener is not None:
             self.listener.resume_writing()
 
-    def data_received(self, bytes data):
+    def data_received(self, data):
         cdef:
-            const char * ptr = PyBytes_AS_STRING(data)
-            size_t sz = PyBytes_GET_SIZE(data)
+            char* ptr
+            Py_ssize_t sz
+
+        _unpack_bytes_like(data, &ptr, &sz)
 
         # Leave some space for simd parsers like simdjson, they require extra
         # space beyond normal data to make sure that vector reads