Final version of reStructuredText.

author: Matěj Cepl <mcepl@cepl.eu> 2018-06-01 21:18:57 +0200
committer: Matěj Cepl <mcepl@cepl.eu> 2018-06-01 21:18:57 +0200
commit: f9f49d3b3996f96e7d04abc78467aa82fe4ead26 (patch)
tree: 95e2199cd4dfc6d85b7b7c674af99bb794a63512 /slides.html
parent: 2e2587717e60d658cc32fd2b108474711b7aa1d2 (diff)
download: PyCon18-m2crypto-f9f49d3b3996f96e7d04abc78467aa82fe4ead26.tar.gz
1 files changed, 0 insertions, 566 deletions
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-
-</div>
-<div id="footer">
-<h1>Wounded hero revived</h1>
-
-</div>
-</div>
-<div class="presentation">
-<div class="slide" id="slide0">
-<h1 class="title">Wounded hero revived</h1>
-
-<p>Lessons learned from porting M2Crypto to Py3k</p>
-<table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field"><th class="field-name">Author:</th><td class="field-body">Matěj Cepl &lt;<a class="reference external" href="mailto:mcepl&#37;&#52;&#48;cepl&#46;eu">mcepl<span>&#64;</span>cepl<span>&#46;</span>eu</a>&gt;</td>
-</tr>
-<tr class="field"><th class="field-name">URL:</th><td class="field-body"><a class="reference external" href="https://matej.ceplovi.cz/clanky/PyCon18-m2crypto/slides.html">https://matej.ceplovi.cz/clanky/PyCon18-m2crypto/slides.html</a></td>
-</tr>
-</tbody>
-</table>
-
-</div>
-<div class="slide" id="origins">
-<h1>Origins</h1>
-<ul class="simple">
-<li>Mitch Kapor sold Lotus to IBM and decided to perpetrate good.
-One of his projects was <a class="reference external" href="https://en.wikipedia.org/wiki/Chandler_(software)">Chandler</a>.</li>
-<li>Project is <a class="reference external" href="https://gitlab.com/mcepl/chandler">gone</a> The only remainder of the project is
-<a class="reference external" href="https://gitlab.com/m2crypto/m2crypto/">M2Crypto</a>, full Python binding for OpenSSL.</li>
-</ul>
-<p class="handout">Once upon a time, one Mitch Kapor, who sold Lotus to IBM, and
-with money he got decided to perpetrate good. He did many
-truly good things for the computer world, was co-founder of
-EFF, helped with Mozilla Foundation, but he also founded
-rather unsuccessful project, a Python-based universal PIM,
-called <a class="reference external" href="https://en.wikipedia.org/wiki/Chandler_(software)">Chandler</a>.</p>
-<p class="handout">Subversion of the project has been mirrored couple of times,
-one by me.</p>
-</div>
-<div class="slide" id="id1">
-<h1>M2Crypto</h1>
-<ul class="simple">
-<li>M2Crypto was maintained by <a class="reference external" href="https://www.heikkitoivonen.net/">Heikki Toivonen</a> few years after
-Chandler folded, but his last release 0.21.1 was from 2011.</li>
-<li>Maintained in Red Hat by <a class="reference external" href="https://github.com/mtrmac">Miloslav Trmač</a>.</li>
-<li>I took over the project in May 2015.</li>
-</ul>
-<p class="handout">Maintenaned in Red Hat by <a class="reference external" href="https://github.com/mtrmac">Miloslav Trmač</a>, who collected
-all patches in RHEL package.</p>
-<p class="handout">I took over the project in May 2015 with the intention just
-to publish all patches and be a point of contact for any
-issue reports. I haven’t expected much activity, because
-package was very silent in RHEL.</p>
-</div>
-<div class="slide" id="strengths-and-weaknesses">
-<h1>Strengths and weaknesses</h1>
-<!-- Strengths -->
-<ul class="simple">
-<li>Backed up by stable C library</li>
-<li>Rather large coverage of OpenSSL API</li>
-<li>Surprisingly widespread use</li>
-<li>Large test suite</li>
-</ul>
-<!-- Weakness -->
-<ul class="simple">
-<li>Unknown issues</li>
-<li>Python 3</li>
-<li>M2Crypto API copies OpenSSL too closely</li>
-<li>Support for Mac OS X and Windows (not mentioning <tt class="docutils literal">*BSD</tt>) was
-broken.</li>
-</ul>
-<p class="handout">Backed by … comparing to PyCrypto and other horrors.</p>
-</div>
-<div class="slide" id="opportunities-threats">
-<h1>Opportunities &amp; Threats</h1>
-<!-- Opportunities -->
-<ul class="simple">
-<li>Satisfying current user base</li>
-<li>Replacing horrors like PyCrypto</li>
-<li>Goal of maintenance is to maintain API</li>
-<li>Extend support on non-Linux platforms</li>
-</ul>
-<!-- Threats -->
-<ul class="simple">
-<li>Python <tt class="docutils literal">ssl</tt> module</li>
-<li>Python <a class="reference external" href="https://github.com/pyca/cryptography">cryptography</a></li>
-</ul>
-<p class="handout">Distribution bug tracker (especially an enterprise one) is
-not a good measure of the real state of use and quality of
-package.</p>
-<p class="handout">There are apparently many programmers for custom software,
-who use M2Crypto (still it is one of the most complete
-bindings for OpenSSL).</p>
-<p class="handout">Threats as a “competing” projects, which may replace
-M2Crypto.</p>
-</div>
-<div class="slide" id="unicode">
-<h1>Unicode</h1>
-<ul class="simple">
-<li>The biggest problem of all Python 2 programs: complete
-confusion between py2k <tt class="docutils literal">str</tt> means py3k <tt class="docutils literal">str</tt> and when
-<tt class="docutils literal">bytes</tt>.</li>
-<li>There are numerous uses of both in M2Crypto, because of course
-both strings and binary data are present in all functions of
-OpenSSL.</li>
-</ul>
-</div>
-<div class="slide" id="strategy">
-<h1>Strategy</h1>
-<ul class="simple">
-<li>Type Hints</li>
-<li>Documentation strings</li>
-<li>CI</li>
-<li>Extension of platform support</li>
-</ul>
-</div>
-<div class="slide" id="c-api">
-<h1>C API</h1>
-<ul class="simple">
-<li>All Unicode/bytes translation happens on C level as well</li>
-<li>Based on <tt class="docutils literal">swig</tt>, which fortunately natively supports
-<tt class="docutils literal"><span class="pre">--py3</span></tt>.</li>
-<li>Also need to support two versions of OpenSSL API, 1.1 and
-older.</li>
-<li>Minimize use of <tt class="docutils literal">#ifdef</tt> s and rather use included shims
-for missing functions.</li>
-</ul>
-</div>
-<div class="slide" id="c-shims-of-missing-functions">
-<h1>C shims of missing functions</h1>
-<ul class="simple">
-<li>For OpenSSL &lt; 1.1</li>
-<li>For Python 2<ul>
-<li><tt class="docutils literal">PyLong_FromLong()</tt> and <tt class="docutils literal">PyUnicode_AsUTF8()</tt> just simple
-<tt class="docutils literal">#define</tt> s.</li>
-<li>All Pythons &gt;= 2.6 contain whole set of Py3k function stubs
-in <tt class="docutils literal">bytesobject.h</tt>.</li>
-</ul>
-</li>
-<li>For Python 3<ul>
-<li><tt class="docutils literal">PyFile_AsFile()</tt> I have no idea, why it was removed from
-py3k API</li>
-</ul>
-</li>
-</ul>
-</div>
-<div class="slide" id="type-hints">
-<h1>Type Hints</h1>
-<ul>
-<li><p class="first"><a class="reference external" href="https://www.python.org/dev/peps/pep-0484/">PEP 484</a> providing <strong>optional</strong> type annotations. Quite
-controversial, but clearly very useful for libraries</p>
-</li>
-<li><p class="first">Native for Python &gt;= 3.5, but supports py2k compatible syntax:</p>
-<pre class="literal-block">
-def sum(x, y):
-    # type: (int, int) -&gt; int
-    return x + y
-</pre>
-</li>
-<li><p class="first">Especially useful for our situation: marking types helps us to
-analyze what invidivual py2k <tt class="docutils literal">str</tt> actually mean.</p>
-</li>
-</ul>
-</div>
-<div class="slide" id="python-porting-shims-again">
-<h1>Python porting (shims again)</h1>
-<p>The same principles apply as with C functions, “shims, not
-<tt class="docutils literal">#ifdef</tt> s”.</p>
-<ul class="simple">
-<li>Plenty of issues are resolved by using <tt class="docutils literal">six</tt> (or
-<tt class="docutils literal">modernize</tt>, <tt class="docutils literal">future</tt>), so use them. If I did it again,
-I would probably use <tt class="docutils literal">future</tt> (and wrote py3k code), but the
-difference is slim.</li>
-<li>Do not hesitate to create your own shims. So I have for
-example, <tt class="docutils literal">bix_to_hex</tt> and <tt class="docutils literal">oct_to_num</tt> or padding functions
-there.</li>
-<li><a class="reference external" href="http://python-future.org/compatible_idioms.html">http://python-future.org/compatible_idioms.html</a></li>
-</ul>
-<p class="handout">Whoever does not understand LISP, is doomed to reinvent it.
-Badly. LISP -&gt; six</p>
-</div>
-</div>
-</body>
-</html>
author	Matěj Cepl <mcepl@cepl.eu>	2018-06-01 21:18:57 +0200
committer	Matěj Cepl <mcepl@cepl.eu>	2018-06-01 21:18:57 +0200
commit	f9f49d3b3996f96e7d04abc78467aa82fe4ead26 (patch)
tree	95e2199cd4dfc6d85b7b7c674af99bb794a63512 /slides.html
parent	2e2587717e60d658cc32fd2b108474711b7aa1d2 (diff)
download	PyCon18-m2crypto-f9f49d3b3996f96e7d04abc78467aa82fe4ead26.tar.gz