I am using beast for implementation of HTTPS Client. In order to make the handshake I call async_handshake. But if I try to shutdown the stream via async_shutdown, I receive the following assert: boost::beast::detail::stream_base::pending_guard::pending_guard(bool&): Assertion `! b_' failed.
Is there a way to correctly shutdown the stream during the handshake?
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sehe
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Кирилл Волков
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As far as I can tell the assertion means that a read/write operation is in progress. Make sure you synchronize access to the stream object using a (implicit) strand.
If you have only one thread, you should already have it. Otherwise, post to the strand executor, e.g. instead of
stream_.async_shutdown(handler);
Do something like
boost::asio::post(stream_.get_executor(),
[self] { self->stream_.async_shutdown(handler); });
If the containing class has shared ownership you would have auto self = shared_from_this();. Otherwise self could just be this.
More background on where and why of strands: Asio docs and Why do I need strand per connection when using boost::asio?
sehe
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Everything is executed on the single thread – Кирилл Волков Sep 14 '22 at 12:53
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Just to check where and how do you run the io_context? – sehe Sep 14 '22 at 12:59
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If we skip the details of implementation, context is created in the main function and the rest of the code is called inside post function – Кирилл Волков Sep 14 '22 at 13:03
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There was just 1 thing I wanted to check: _where_ do you `run()` it? I'm assuming directly in main. – sehe Sep 14 '22 at 13:10
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1Yes, you are right – Кирилл Волков Sep 14 '22 at 13:29