Test MessageSetBuffer close -- cover double close compression bug

test/test_buffer.py

@@ -0,0 +1,70 @@
+# pylint: skip-file
+from __future__ import absolute_import
+
+import io
+
+import pytest
+
+from kafka.producer.buffer import MessageSetBuffer
+from kafka.protocol.message import Message, MessageSet
+
+
+def test_buffer_close():
+    records = MessageSetBuffer(io.BytesIO(), 100000)
+    orig_msg = Message(b'foobar')
+    records.append(1234, orig_msg)
+    records.close()
+
+    msgset = MessageSet.decode(records.buffer())
+    assert len(msgset) == 1
+    (offset, size, msg) = msgset[0]
+    assert offset == 1234 
+    assert msg == orig_msg
+
+    # Closing again should work fine
+    records.close()
+
+    msgset = MessageSet.decode(records.buffer())
+    assert len(msgset) == 1
+    (offset, size, msg) = msgset[0]
+    assert offset == 1234
+    assert msg == orig_msg
+
+
+@pytest.mark.parametrize('compression', [
+    'gzip',
+    'snappy',
+    pytest.mark.skipif("sys.version_info < (2,7)")('lz4'), # lz4tools does not work on py26
+])
+def test_compressed_buffer_close(compression):
+    records = MessageSetBuffer(io.BytesIO(), 100000, compression_type=compression)
+    orig_msg = Message(b'foobar')
+    records.append(1234, orig_msg)
+    records.close()
+
+    msgset = MessageSet.decode(records.buffer())
+    assert len(msgset) == 1
+    (offset, size, msg) = msgset[0]
+    assert offset == 0
+    assert msg.is_compressed()
+
+    msgset = msg.decompress()
+    (offset, size, msg) = msgset[0]
+    assert not msg.is_compressed()
+    assert offset == 1234
+    assert msg == orig_msg
+
+    # Closing again should work fine
+    records.close()
+
+    msgset = MessageSet.decode(records.buffer())
+    assert len(msgset) == 1
+    (offset, size, msg) = msgset[0]
+    assert offset == 0
+    assert msg.is_compressed()
+
+    msgset = msg.decompress()
+    (offset, size, msg) = msgset[0]
+    assert not msg.is_compressed()
+    assert offset == 1234
+    assert msg == orig_msg