Function write

flow/Net2.actor.cpp:1087–1122

Writes as many bytes as possible from the given SendBuffer chain into the write buffer and returns the number of bytes written (might be 0)

	// Writes as many bytes as possible from the given SendBuffer chain into the write buffer and returns the number of
	// bytes written (might be 0)
	int write(SendBuffer const* data, int limit) override {
#ifdef __APPLE__
		// For some reason, writing ssl_sock with more than 2016 bytes when socket is writeable sometimes results in a
		// broken pipe error.
		limit = std::min(limit, 2016);
#endif
		boost::system::error_code err;
		++g_net2->countWrites;

		size_t sent = ssl_sock.write_some(
		    boost::iterator_range<SendBufferIterator>(SendBufferIterator(data, limit), SendBufferIterator()), err);

		if (err) {
			// Since there was an error, sent's value can't be used to infer that the buffer has data and the limit is
			// positive so check explicitly.
			ASSERT(limit > 0);
			bool notEmpty = false;
			for (auto p = data; p; p = p->next)
				if (p->bytes_written - p->bytes_sent > 0) {
					notEmpty = true;
					break;
				}
			ASSERT(notEmpty);

			if (err == boost::asio::error::would_block) {
				++g_net2->countWouldBlock;
				return 0;
			}
			onWriteError(err);
			throw connection_failed();
		}

		ASSERT(sent); // Make sure data was sent, and also this check will fail if the buffer chain was empty or the
		              // limit was not > 0.
		return sent;
	}

	NetworkAddress getPeerAddress() const override { return peer_address; }