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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_110858846">doc/cha-gtls-app.texi</a>:
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="plaintext"> ret = gnutls_record_recv_early_data(session, buffer, sizeof(buffer));</span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="plaintext"> assert(ret >= 0);</span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="plaintext"> ...</span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="plaintext"> return ret;</span>
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="plaintext">@}</span>
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="plaintext">int main()</span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="plaintext">@{</span>
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="plaintext"> ...</span>
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="plaintext"> gnutls_handshake_set_hook_function(server, GNUTLS_HANDSHAKE_END_OF_EARLY_DATA,</span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="plaintext"> GNUTLS_HOOK_POST, handshake_hook_func);</span>
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="plaintext"> ...</span>
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<p dir="auto">On the sending size, I agree that some kind of separation is important to avoid inadvertently sending 0rtt data. But on the receiving size, is there a benefit in that separation in practice? I'm thinking that an HTTPS server, could it skip the early data and only process the "late" ones?My understanding from <a href="https://tools.ietf.org/html/rfc8470#section-2" rel="nofollow noreferrer noopener" target="_blank">rfc8470</a>, is that there is no real distinction for the application, so aligning the API with the expectation may be simpler. In case such a distinction is needed in the future, maybe we can use session flags to indicate whether early data reading is in progress or complete, so that there is a way to distinguish the state of recv.</p>
<p dir="auto">Alternatively to session flags, we could also use the packet API (<code>gnutls_record_recv_packet</code>) to pass the information on whether the received packet was early data (e.g. with a new function <code>gnutls_packet_get_flags</code> or so).</p>
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