<link>http://people.skolelinux.org/pere/blog/</link>
<atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
+ <item>
+ <title>Websocket from Kraken in Valutakrambod</title>
+ <link>http://people.skolelinux.org/pere/blog/Websocket_from_Kraken_in_Valutakrambod.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Websocket_from_Kraken_in_Valutakrambod.html</guid>
+ <pubDate>Fri, 1 Feb 2019 22:25:00 +0100</pubDate>
+ <description><p>Yesterday, the Kraken virtual currency exchange announced
+<a href="https://blog.kraken.com/post/2019/websockets-public-api-launching-soon/">their
+Websocket service</a>, providing a stream of exchange updates to its
+clients. Getting updated rates quickly is a good idea, so I used
+their <a href="https://www.kraken.com/en-us/help/websocket-api">API
+documentation</a> and added Websocket support to the Kraken service in
+Valutakrambod today. The python library can now get updates
+from Kraken several times per second, instead of every time the
+information is polled from the REST API.</p>
+
+<p>If this sound interesting to you, the code for valutakrambod is
+available from
+<a href="http://github.com/petterreinholdtsen/valutakrambod">github</a>.
+Here is example output from the example client displaying rates in a
+curses view:</p>
+
+<p><blockquote><pre>
+ Name Pair Bid Ask Spr Ftcd Age
+ BitcoinsNorway BTCEUR 2959.2800 3021.0500 2.0% 36 nan nan
+ Bitfinex BTCEUR 3087.9000 3088.0000 0.0% 36 37 nan
+ Bitmynt BTCEUR 3001.8700 3135.4600 4.3% 36 52 nan
+ Bitpay BTCEUR 3003.8659 nan nan% 35 nan nan
+ Bitstamp BTCEUR 3008.0000 3010.2300 0.1% 0 1 1
+ Bl3p BTCEUR 3000.6700 3010.9300 0.3% 1 nan nan
+ Coinbase BTCEUR 2992.1800 3023.2500 1.0% 34 nan nan
+ Kraken+BTCEUR 3005.7000 3006.6000 0.0% 0 1 0
+ Paymium BTCEUR 2940.0100 2993.4400 1.8% 0 2688 nan
+ BitcoinsNorway BTCNOK 29000.0000 29360.7400 1.2% 36 nan nan
+ Bitmynt BTCNOK 29115.6400 29720.7500 2.0% 36 52 nan
+ Bitpay BTCNOK 29029.2512 nan nan% 36 nan nan
+ Coinbase BTCNOK 28927.6000 29218.5900 1.0% 35 nan nan
+ MiraiEx BTCNOK 29097.7000 29741.4200 2.2% 36 nan nan
+ BitcoinsNorway BTCUSD 3385.4200 3456.0900 2.0% 36 nan nan
+ Bitfinex BTCUSD 3538.5000 3538.6000 0.0% 36 45 nan
+ Bitpay BTCUSD 3443.4600 nan nan% 34 nan nan
+ Bitstamp BTCUSD 3443.0100 3445.0500 0.1% 0 2 1
+ Coinbase BTCUSD 3428.1600 3462.6300 1.0% 33 nan nan
+ Gemini BTCUSD 3445.8800 3445.8900 0.0% 36 326 nan
+ Hitbtc BTCUSD 3473.4700 3473.0700 -0.0% 0 0 0
+ Kraken+BTCUSD 3444.4000 3445.6000 0.0% 0 1 0
+ Exchangerates EURNOK 9.6685 9.6685 0.0% 36 22226 nan
+ Norgesbank EURNOK 9.6685 9.6685 0.0% 36 22226 nan
+ Bitstamp EURUSD 1.1440 1.1462 0.2% 0 1 2
+ Exchangerates EURUSD 1.1471 1.1471 0.0% 36 22226 nan
+ BitcoinsNorway LTCEUR 1.0009 22.6538 95.6% 35 nan nan
+ BitcoinsNorway LTCNOK 259.0900 264.9300 2.2% 35 nan nan
+ BitcoinsNorway LTCUSD 0.0000 29.0000 100.0% 35 nan nan
+ Norgesbank USDNOK 8.4286 8.4286 0.0% 36 22226 nan
+</pre></blockquote></p>
+
+<p>Yes, I notice the strange negative spread on Hitbtc. I've seen the
+same on Kraken. Another strange observation is that Kraken some times
+announce trade orders a fraction of a second in the future. I really
+wonder what is going on there.</p>
+
+<p>As usual, if you use Bitcoin and want to show your support of my
+activities, please send Bitcoin donations to my address
+<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
+</description>
+ </item>
+
<item>
<title>Strategispillet Unknown Horizons nå tilgjengelig på bokmål</title>
<link>http://people.skolelinux.org/pere/blog/Strategispillet_Unknown_Horizons_n__tilgjengelig_p__bokm_l.html</link>
<a href="https://www.empo.no/">EMPT TV</a> and
<a href="https://www.p7.no/">P7</a>.
-<p>As usual, if you use Bitcoin and want to show your support of my
-activities, please send Bitcoin donations to my address
-<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
-</description>
- </item>
-
- <item>
- <title>Time for an official MIME type for patches?</title>
- <link>http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html</guid>
- <pubDate>Thu, 1 Nov 2018 08:15:00 +0100</pubDate>
- <description><p>As part of my involvement in
-<a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core">the Nikita
-archive API project</a>, I've been importing a fairly large lump of
-emails into a test instance of the archive to see how well this would
-go. I picked a subset of <a href="https://notmuchmail.org/">my
-notmuch email database</a>, all public emails sent to me via
-@lists.debian.org, giving me a set of around 216 000 emails to import.
-In the process, I had a look at the various attachments included in
-these emails, to figure out what to do with attachments, and noticed
-that one of the most common attachment formats do not have
-<a href="https://www.iana.org/assignments/media-types/media-types.xhtml">an
-official MIME type</a> registered with IANA/IETF. The output from
-diff, ie the input for patch, is on the top 10 list of formats
-included in these emails. At the moment people seem to use either
-text/x-patch or text/x-diff, but neither is officially registered. It
-would be better if one official MIME type were registered and used
-everywhere.</p>
-
-<p>To try to get one official MIME type for these files, I've brought
-up the topic on
-<a href="https://www.ietf.org/mailman/listinfo/media-types">the
-media-types mailing list</a>. If you are interested in discussion
-which MIME type to use as the official for patch files, or involved in
-making software using a MIME type for patches, perhaps you would like
-to join the discussion?</p>
-
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
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