[feat] Support WaitForExclusive and ExclusiveWithFencing producer access mode #6
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…#121) ### Motivation When I ran the tests of Python wrapper in my local env, I observed a segmentation fault. See the key stacktrace: ``` #3 0x00007ffff6d742c5 in std::unique_lock<std::mutex>::lock() () from /usr/local/lib/python3.8/dist-packages/_pulsar.cpython-38-x86_64-linux-gnu.so #4 0x00007ffff6d72523 in std::unique_lock<std::mutex>::unique_lock(std::mutex&) () from /usr/local/lib/python3.8/dist-packages/_pulsar.cpython-38-x86_64-linux-gnu.so #5 0x00007ffff67de193 in pulsar::ClientImpl::newRequestId (this=0x0) at /home/xyz/github.com/apache/pulsar-client-cpp/lib/ClientImpl.cc:644 #6 0x00007ffff685d2c2 in pulsar::ConsumerImpl::~ConsumerImpl (this=0x7fff9800f9e0, __in_chrg=<optimized out>) at /home/xyz/github.com/apache/pulsar-client-cpp/lib/ConsumerImpl.cc:116 ``` In the destructor of `ConsumerImpl`, `client->newRequestId` might be called. However, `client` might be a null pointer because it's returned by `std::weak_ptr::lock()`. ### Modifications Add null check to avoid the segfault.
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Fixes apache#167 ### Motivation Here are some debugging info when the segfault happened in `testCloseClient`. The outputs have been trimmed to make them clear. An example crash at `async_write`: ``` #12 0x00007ffff7496dad in basic_stream_socket<...>::boost::asio::async_write /usr/include/boost/asio/impl/write.hpp:512 #13 0x00007ffff748e003 in ClientConnection::asyncWrite lib/ClientConnection.h:245 #14 0x00007ffff746e0b6 in ClientConnection::handleHandshake (this=0x555555e689d0) lib/ClientConnection.cc:502 ``` Another example crash at `async_receive`: ``` #6 0x00007ffff7497247 in basic_stream_socket<...>::async_receive /usr/include/boost/asio/basic_stream_socket.hpp:677 #7 0x00007ffff748e647 in ClientConnection::asyncReceive lib/ClientConnection.h:258 #8 0x00007ffff746fa5d in ClientConnection::readNextCommand lib/ClientConnection.cc:606 ``` The frame where it crashed: ``` 245 if (descriptor_data->shutdown_) (gdb) p descriptor_data $2 = (boost::asio::detail::epoll_reactor::per_descriptor_data &) @0x555555e4a780: 0x0 ``` We can see the socket descriptor is `nullptr`. The root cause is when `async_receive` or `async_write` is called, the `io_service` object might be closed. This case happened when `createProducerAsync` is called, the actual producer creation continues in another thread, while the `client.close()` happens in the current thread. ### Modifications Check if the `ClientConnection` is closed before `async_receive` or `async_write`. To avoid the use of lock, changing the `state_` field to atomic. ### Verifications ```bash ./tests/pulsar-tests --gtest_filter='ClientTest.testCloseClient' --gtest_repeat=20 ``` It never crashed after applying this patch.
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