Add kafka.protocol.frame.KafkaBytes

kafka/protocol/frame.py

@@ -0,0 +1,30 @@
+class KafkaBytes(bytearray):
+    def __init__(self, size):
+        super(KafkaBytes, self).__init__(size)
+        self._idx = 0
+
+    def read(self, nbytes=None):
+        if nbytes is None:
+            nbytes = len(self) - self._idx
+        start = self._idx
+        self._idx += nbytes
+        if self._idx > len(self):
+            self._idx = len(self)
+        return bytes(self[start:self._idx])
+
+    def write(self, data):
+        start = self._idx
+        self._idx += len(data)
+        self[start:self._idx] = data
+
+    def seek(self, idx):
+        self._idx = idx
+
+    def tell(self):
+        return self._idx
+
+    def __str__(self):
+        return 'KafkaBytes(%d)' % len(self)
+
+    def __repr__(self):
+        return str(self)