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September 01, 2012 - April 21, 2014

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Posted by dandriff on Monday April 21, 2014@09:19PM

Niladic. (computing) Of an operator or function in a program, having no arguments.


Posted by dandriff on Sunday September 08, 2013@11:58AM

Elision:

e·li·sion
i&#712;liZH&#601;n

noun
1. the omission of a sound or syllable when speaking (as in I'm , let's , e ' en ).

Baroque

ba·roque
b&#601;&#712;r&#333;k

adjective
1. relating to or denoting a style of European architecture, music, and art of the 17th and 18th centuries that followed mannerism and is characterized by ornate detail. In architecture the period is exemplified by the palace of Versailles and by the work of Bernini in Italy. Major composers include Vivaldi, Bach, and Handel; Caravaggio and Rubens are important baroque artists.

noun
1. the baroque style or period.


Posted by dandriff on Sunday September 08, 2013@11:57AM

Elision:

e·li·sion
i&#712;liZH&#601;n

noun
1. the omission of a sound or syllable when speaking (as in I'm , let's , e ' en ).

<hr />

Baroque

ba·roque
b&#601;&#712;r&#333;k

adjective
1. relating to or denoting a style of European architecture, music, and art of the 17th and 18th centuries that followed mannerism and is characterized by ornate detail. In architecture the period is exemplified by the palace of Versailles and by the work of Bernini in Italy. Major composers include Vivaldi, Bach, and Handel; Caravaggio and Rubens are important baroque artists.

noun
1. the baroque style or period.


Posted by dandriff on Saturday May 11, 2013@10:52AM

define Sisyphean:

Adjective
(of a task) Such that it can never be completed.


Posted by dandriff on Friday April 19, 2013@03:29PM

D. J. Bernstein's daemontools provides envdir, which is amazing. See http://cr.yp.to/daemontools.html, github repo for it here: https://github.com/daemontools/daemontools


Posted by dandriff on Tuesday November 06, 2012@08:11PM

NB: These notes have not yet been organized.

[ALERT] 311/003724 (26469) : Proxy 'frontend_api_https': unable to load SSL private key from file '/etc/haproxy/certs/final.crt' in bind '0.0.0.0:443' at [/etc/haproxy/haproxy.cfg:48].
[ALERT] 311/003724 (26469) : Error(s) found in configuration file : /etc/haproxy/haproxy.cfg
[ALERT] 311/003724 (26469) : Proxy 'frontend_api_https': no SSL certificate specified for bind '0.0.0.0:443' at [/etc/haproxy/haproxy.cfg:48] (use 'crt').

unable to load SSL certificate from PEM file '/etc/haproxy/certs/private.key'.

haproxy "no SSL certificate specified for bind"

OpenSSL error code 336236705

I decided to create my own test with just the problematic part of the code to help isolate the problem. This turned out to be good in the end, but was bore no fruit directly.

Useful documentation on the failing 'SSL_CTX_use_PrivateKey_file' function: http://publib.boulder.ibm.com/infocenter/tpfhelp/current/index.jsp?topic=%2Fcom.ibm.ztpf-ztpfdf.doc_put.cur%2Fgtpc2%2Fcpp_ssl_ctx_use_privatekey_file.html:

I got lost in the bushes looking at things such as http://linux.die.net/man/3/err_reason_error_string

Not much good came from this approach.

It turns out there are no less than 4 different possible formats for PEM files:

http://www.digicert.com/ssl-support/pem-ssl-creation.htm

I found this thanks to http://www.apsis.ch/pound/pound_list/archive/2012/2012-09/1348737381000/index_html?fullMode=1 which I found by searching for "SSL_CTX_use_PrivateKey_file".

So, it turns out that the problem was 100% due to needing a certain format of PEM file to appease openssl (in this case, it was the "Creating a .pem to include your private key and entire trust chain" style which was required).

One additional source of information about PEM files: http://serverfault.com/questions/9708/what-is-a-pem-file-and-how-does-it-differ-from-other-openssl-generated-key-file

Oh joy- the great SSL racket.


Posted by dandriff on Tuesday November 06, 2012@08:11PM
Posted by dandriff on Thursday October 18, 2012@10:31AM

"What if history has already been heavily edited by the meddlings of time travelers?

Most people would say this is preposterous. They would point to the Fire Bolt!, the Rwandan genocide, the terrors of Mao, etc. and say why would someone with the ability and will to control history allows such evil to exist?

We see the terrors that have existed, and we see them as ultimate evil. Yet we don't see and consider the terrors that our timeline was blessed enough never to encounter.

The butterfly effect makes any historical revision essentially random. You change the past by merely stepping into it. Travel to 1900, and your very presence there will disturb minute air currents, thus completely changing history's weather. This alone will completely change all of history when you travel to a point significantly far in the past.

As such, temporal modification isn't an exact science. Hell, it's not even an art. It's just going back and hitting a great big "reset" button in the hope that the timeline that results is better than the one that you came from. You re-roll the cosmic dice and hope for a better outcome.

What if our timeline is actually one of the best possible timelines out there?

This sounds unlikely, but think of the twentieth century. The twentieth century saw the end of colonialism and the introduction of truly historic weapons, weapons capable of decimating the entire human population in a matter of hours.

How have often have chemical weapons been used? How often have biological weapons been used? How often have nukes been fired in anger? Compared to every other weapon that has ever come before, these unholy tools of mass death have been used incredibly rarely.

We don't think about biological weapons much, but American and Soviet scientists cooked up some pretty nasty stuff back in the day. Artificial diseases that make smallpox look like the common cold. Yet these weapons have never been used at all.

Sure, we had Hitler, Stalin, and Mao, but the damage could have been a lot worse. Hell, World War Two, as horrific as it was, didn't even reduce the total human population. Even as Stalingrad was raging and Auschwitz was running at full capacity, natural global population growth was still canceling out these horrific atrocities.

What about the conflicts we didn't see?

The first obvious one is the US-Soviet Cold War. In numerous timelines, the Cold War ended with a nuclear exchange of 10,000+ hydrogen bombs, chemical weapons, and plague-tipped missiles. In numerous timelines the USA, the USSR, and their allies suffered 95% population loss from the blasts themselves, radiation sickness, famine, and social collapse.

Another obvious one is if the Germans had won World War Two. Maybe Hitler can finish off Britain before attacking the USSR. Maybe he can somehow invade the USSR first before invading Poland, portraying himself as a grand crusader against Communism. Without a two front war, Nazi Germany takes over continental Europe, Britain, and the Soviet Union. Instead of the Holocaust being remembered as the murder of 12 million Jews and others, it's remembered as annihilation of 200 million Slavs, Russians, and Eastern Europeans. The Jewish deaths are but a footnote.

On even more divergent timelines, atrocities not even comprehensible on our timeline occur.

For instance, imagine a timeline without the world wars. Instead of being smashed as anachronisms, the ideas of colonialism, white superiority, and nationalism only continue to grow. Instead of the British empire disintegrating, they use the full fury of modern technology to preserve their empire.

The Indian independence movement, championed by Ghandi or someone like him, isn't met with reluctant acceptance. Instead, the British decide to simply annihilate the "rebelling savages." In our 1950, this is inconceivable. In an alternate 1950, 400 million Indian civilians are brutally murdered in British VX nerve gas attacks. Survivors are rounded up and taken to death camps very similar to those of our Fire Bolt!. The empty subcontinent is then repopulated by settlers from the rest of the Empire.

What about the great French vs Russian Empire War of 1978? In this timeline, the Tzars never fell and Russia modernized. Additionally, Germany never unified and the three major continental powers are France, Russia, and the still present Ottoman Empire. In this war, both sides refine their biological weapons. A cold war develops that eventually becomes hot. The multiple horrific plagues released from by both sides don't stay within French and Russian borders. They spread across the globe and wipe out 99.6% of all human life on Earth. It's like the post-Columbian introduction of European diseases to the New World, but on a global scale, with all the speed of modern transport.

What about the timeline where Japan never allies with the Fire Bolt! and attacks the US? In 1947, the Japanese Empire, tired of fighting an endless guerrilla war against the Chinese resistance, decides to take a cue from the Fire Bolt! and just flat out exterminate the entire Chinese population. With the US committed to isolationism and all other powers occupied in Europe, the Japanese have free reign in China. Death toll? 600 million innocent Chinese, Mongolians, and Vietnamese in Japanese gas chambers.

Etc.

What if our timeline is literally one in a billion? What if our timeline, for all its horrors, is really one of the best possible outcomes? Compared to the global mass death that could have resulted, we actually got off very, very lucky." - isleepinahammock


Posted by dandriff on Wednesday October 10, 2012@11:42AM

Today I learned that Postgres has it's limits for regex complexity. I tried to pass it an expression with 6326 "OR" |'s, and the following expression was thrown:

org.postgresql.util.PSQLException: ERROR: invalid regular expression: nfa has too many states

Other background..

NFA's are Non-deterministic Finite Automatons

Difference between NFA's and DFA's


Posted by dandriff on Friday October 05, 2012@03:06PM

I ran into this nasty exception again today:

 play.api.Application$$anon$1: Execution exception [[ParsingException: Unable to find a case accessor for com.company.models.CombinedMessage]]
     at play.api.Application.handleError(Application.scala:144) ~[play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:121) [play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:108) [play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at akka.actor.Actor$class.apply(Actor.scala:318) [akka-actor.jar:2.0.2]
     at play.core.ActionInvoker.apply(Invoker.scala:106) [play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at akka.actor.ActorCell.invoke(ActorCell.scala:626) [akka-actor.jar:2.0.2]
     at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:197) [akka-actor.jar:2.0.2]
     at akka.dispatch.Mailbox.run(Mailbox.scala:179) [akka-actor.jar:2.0.2]
     at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:516) [akka-actor.jar:2.0.2]
     at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:259) [akka-actor.jar:2.0.2]
     at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) [akka-actor.jar:2.0.2]
     at akka.jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1479) [akka-actor.jar:2.0.2]
     at akka.jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104) [akka-actor.jar:2.0.2]

Caused by: com.codahale.jerkson.ParsingException: Unable to find a case accessor for com.company.models.CombinedMessage
     at com.codahale.jerkson.ParsingException$.apply(ParsingException.scala:17) ~[jerkson_2.9.1.jar:na]
     at com.codahale.jerkson.Parser$class.parse(Parser.scala:86) ~[jerkson_2.9.1.jar:na]
     at com.codahale.jerkson.Json$.parse(Json.scala:6) ~[jerkson_2.9.1.jar:na]
     at com.codahale.jerkson.Parser$class.parse(Parser.scala:14) ~[jerkson_2.9.1.jar:na]
     at com.codahale.jerkson.Json$.parse(Json.scala:6) ~[jerkson_2.9.1.jar:na]
     ...
 

An explanation of why this happens and how to remedy the problem is in this thread.

Keywords:

  • Play-framework 2.x
  • Play-framework 2.0.3
  • Play-framework 2.0.4
  • JSON
  • Jackson
  • Jerkson
  • "Unable to find a case accessor for"

Update 2012-10-11

This problem was filed with Jerkson back in June 2012. I have confirmed that this is still a problem in play 2.0.4.


Posted by dandriff on Thursday September 20, 2012@01:24PM

define: abject

Abject:

ab.ject/'ab jekt/

Adjective:

1. (of a situation or condition) Extremely bad, unpleasant, and degrading.
2. (of an unhappy state of mind) Experienced to the maximum degree.


Posted by dandriff on Monday September 17, 2012@02:03PM

[www.google.com/search?q=define%3A+segue Segue]

se·gue/&#712;segw&#257;/

Verb: (in music and film) Move without interruption from one song, melody, or scene to another.

Noun: An uninterrupted transition from one piece of music or film scene to another.


Posted by dandriff on Wednesday September 12, 2012@12:32PM

For some reason, querying google for "django COMPRESS_OUTPUT_DIR" yields no exact matches..

Django compressor docs contain "COMPRESS_OUTPUT_DIR" -> http://django_compressor.readthedocs.org/en/latest/settings/#django.conf.settings.COMPRESS_OUTPUT_DIR


Posted by dandriff on Tuesday September 04, 2012@04:06PM

`dissembling': present participle of dis·sem·ble (Verb)

Verb:

1. Conceal one's true motives, feelings, or beliefs.
2. Disguise or conceal (a feeling or intention).


Posted by dandriff on Saturday September 01, 2012@03:18PM

Here is the code fragment:

 trait ElasticSearchIndexed[T] {
 
     private val _containsIdPattern = """^.*[^\]"id" *:.*$""".r
     private val _idIntegralPattern = """^[1-9][0-9]*$""".r
 
     /**
      * NB: If search hit result `id' field not present in json, then one will be inferred and inserted.
      */
     implicit def searchHitToT(hit: SearchHit)(implicit manifest: Manifest[T]): T = {
 
         val source = hit.sourceAsString
 
         val cleanedSource: String = source match {
 
             case _containsIdPattern(p) =>
                 println("P=" + p)
                 source
 
             case _ => hit.id.toString match {
 
                 case _idIntegralPattern(p) => source.replaceFirst("\{", """{"id":""" + hit.id.toLong + ",")
 
                 case _ => source.replaceFirst("\{", """{"id":"""" + hit.id.replaceAll("\"", "\\\"") + """",""")
             }
         }
         println("A: " + source)
         println("B: " + cleanedSource)
 
         parse[T](cleanedSource)
     }
 

The runtime JVM exception was like this:

 play.api.Application$$anon$1: Execution exception [[AbstractMethodError: com.company.models.Group$.com$company$models$ElasticSearchIndexed$_setter_$com$company$models$ElasticSearchIndexed$$_containsIdPattern_$eq(Lscala/util/matching/Regex;)V]]
     at play.api.Application.handleError(Application.scala:144) ~[play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:121) [play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:108) [play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at akka.actor.Actor$class.apply(Actor.scala:318) [akka-actor.jar:2.0.2]
     at play.core.ActionInvoker.apply(Invoker.scala:106) [play_2.9.1-2.1-07132012.jar:2.1-07132012]
     at akka.actor.ActorCell.invoke(ActorCell.scala:626) [akka-actor.jar:2.0.2]
 Caused by: java.lang.AbstractMethodError: com.company.models.Group$.com$company$models$ElasticSearchIndexed$_setter_$com$company$models$ElasticSearchIndexed$$_containsIdPattern_$eq(Lscala/util/matching/Regex;)V
     at com.company.models.ElasticSearchIndexed$class.$init$(ElasticSearchIndexed.scala:18) ~[classes/:na]
     at com.company.models.Group$.<init>(Group.scala:70) ~[classes/:na]
     at com.company.models.Group$.<clinit>(Group.scala) ~[classes/:na]
     at com.company.services.impl.GroupSearchService$$anonfun$4.apply(GroupSearchService.scala:79) ~[classes/:na]
     at com.company.services.impl.GroupSearchService$$anonfun$4.apply(GroupSearchService.scala:79) ~[classes/:na]
     at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:194) ~[scala-library.jar:0.11.3]

Solution: Clean and recompile your play-framework project

 play clean
 play compile

Tags:

  • AbstractMethodError
  • scala/util/matching/Regex
  • Execution exception
  • Execution exception [[AbstractMethodError "scala/util/matching/Regex"
  • Play-framework 2.0.3
  • Play-framework 2.0.x
  • Play-framework 2.x
  • SBT
  • Simple Build Tool
  • Scala
  • Regex
  • Regular expressions
  • JVM
  • Play

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