Tips, Tricks, Tutorials, and Trivia

Find all lines without "]" at the end

2021-03-21T07:57:00.003-07:00

cat bookmarks.txt | awk '/[^\]]$/' | less

nginx local proxy

2015-12-13T14:49:00.002-08:00

I wanted just a simple nginx setup to forward to a local app. Here's the result:

http {
...

    server {
      server_name 52.62.72.255;
      #access_log   /var/log/nginx/histories.log;
      location / {
        proxy_pass      http://127.0.0.1:3000;
      }
    }

For some reason it was hard to find this info! I had to pull it from one of my other servers. But one good example is this reference: http://wiki.nginx.org/FullExample

Unable to SSH to new AWS servers, until: route table

2015-07-15T23:13:00.002-07:00

Symptoms: I've had an AWS account for years, and I went back and created some instances this past week but then I couldn't access them (via SSH: "Operation timed out"). One oddity was that my old instances had no VPC ID, but every new instance had one (and the VPC was created if none existed).

Solution: I found this troubleshooting guide for connecting, and I followed the step on route tables and added a route with a destination of 0.0.0.0/0 and target of igw... (which is auto-filled with my internet gateway ID).

I've never had to do this before. Hopefully I'll remember!

PermanentRedirect when accessing AWS S3 bucket

2015-05-05T17:11:00.002-07:00

When running this on the command-line:

aws s3 ls s3://my-bucket/

I kept getting this error:

A client error (PermanentRedirect) occurred when calling the ListObjects operation: The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.

The problem was that my region wasn't set. I did this to fix it:

export AWS_DEFAULT_REGION=us-west-2

This is a pretty stupid situation: when using the web console, the S3 service says that there's no need to choose a region, and it won't even let you select one. But obviously it's very important for configurations. Dumb.

Solutions for Vagrant deployment to AWS

2014-09-04T00:00:00.000-07:00

Here are a bunch of notes from troubleshooting Vagrant out to AWS:

An active machine was found with a different provider. Vagrant currently allows each machine to be brought up with only a single provider at a time. A future version will remove this limitation. Until then, please destroy the existing machine to up with a new provider. Machine name: default Active provider: virtualbox Requested provider: aws

... yep, destroy it

<br /><span style="font-family: Arial, Helvetica, sans-serif;">Here are a bunch of old notes on errors I got while trying to use Vagrant with AWS.</span><br /> The box you're attempting to add doesn't support the provider you requested. Please find an alternate box or use an alternate provider. Double-check your requested provider to verify you didn't simply misspell it. Name: hashicorp/precise64 Address: https://vagrantcloud.com/hashicorp/precise64 Requested provider: [:aws] ... change to the dummy box There was an error talking to AWS. The error message is shown below: UnauthorizedOperation => You are not authorized to perform this operation. ... IAM... had to make user with that key ID have power access

==> default: Warning! Vagrant might not be able to SSH into the instance. ==> default: Please check your security groups settings. /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/middlewares/expects.rb:6:in `response_call': The image id '[ami-21e6e964]' does not exist (Fog::Compute::AWS::NotFound) from /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/middlewares/response_parser.rb:8:in `response_call' from /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/connection.rb:363:in `response' from /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/connection.rb:233:in `request' from /Users/tlarson/.vagrant.d/gems/gems/fog-1.23.0/lib/fog/xml/sax_parser_connection.rb:35:in `request' ... had to find an AMI, in the right zone ==> default: Warning! Vagrant might not be able to SSH into the instance. ==> default: Please check your security groups settings. /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/middlewares/expects.rb:6:in `response_call': The key pair 'halfpricedgranite-workbook' does not exist (Fog::Compute::AWS::NotFound) from /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/middlewares/response_parser.rb:8:in `response_call' from /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/connection.rb:363:in `response' from /Users/tlarson/.vagrant.d/gems/gems/excon-0.39.5/lib/excon/connection.rb:233:in `request' from /Users/tlarson/.vagrant.d/gems/gems/fog-1.23.0/lib/fog/xml/sax_parser_connection.rb:35:in `request' ... again, in the right zone ==> default: Waiting for instance to become "ready"... ==> default: Waiting for SSH to become available... ^C ... because networking is restricted: security_groups ... and may want to name it

Adding tables to Etherpad Lite

2014-08-16T12:30:00.000-07:00

So I love the real-time sharing of Google Docs, so I installed our own Etherpad Lite... and then I wanted tables so I installed ep_tables, but it was a bear to try and copy existing tables into there, so I finally exported some tables and found the format and here's what I recommend, in this example of 2 lines:

{"payload":[["This is a sample row on table 1"," "," "]],"tblId":"1","tblClass":"data-tables"}

{"payload":[[" "," "," row 2 column 3"]],"tblId":"1","tblClass":"data-tables"}

... where each row of data is a line of text. Just paste them in the document and it reformats into a table.
It turns out the plugin doesn't like line breaks (or tabs) in a row, so don't even try... and that's one reason I wouldn't try and put multiple rows inside one payload line like this:
{"payload":[["This is a sample row on table 1","",""],["",""," row 2 column 3"]],"tblId":"1","tblClass":"data-tables"}

Since you can't split each row onto a new line it is pretty unreadable.
Other hints:

Only use the 'Table' button at the top to manipulate the table and not the little mouse-overs... they just never did anything reliable for me.
I also installed styles and formatting, but I couldn't get them to apply inside the table.
I don't see the purpose of the tblId; I put rows with the same tblId in different places and they showed at their location in the document, with line breaks or whatever in between.

The day-of-week for any day this year (and this century)

2014-07-07T09:04:00.000-07:00

I came up with this approach to figure out the day-of-week for any day during the current year:

Each year, remember the weekday of first day of the year, eg. Wed in 2014 (See below for a formula for this in the 21st century.)
Memorize this set of numbers, one for each month: 155274263153 ... which is the date of the first time that day occurs each month

You can probably get it from there... so here's an example: what day is Dec 25 this year?

December is month #12, so take the last digit in that set of numbers: 3
That means the 3rd is the first time that Wed occurs this December.
Add multiples of 7 to get to other Wed that are close:

+7=10
+14=17
+21 = 24

Since Dec 24 is on Wed, Dec 25 must be on Thurs

The exception is leap years, and I typically subtract one from the first day in January and February.

This makes it pretty easy, because that first weekday only changes each year and I can remember that day for the whole year.

Now, for the majority of my lifetime (if things don't go as I hope), it's actually pretty easy to find the first day of the year for any year:

Take the year without the 2000 part, eg. 14 for 2014
Calculate (y + y div 4) mod 7

or (y mod 7 + y div 4) mod 7
or (y mod 7 + (y div 4) mod 7) mod 7

0=Sun, 1=Mon, etc.

except for on leap years (divisible by 4) subtract 1 day for Jan-Feb

Pretty easy to remember for us mathematicians... it starts with Sunday, and then moves one day each year with an extra adjustment on leap years.

The rules get really complicated for previous or future centuries because we don't have leap-years every 100 years but then we do have them every 400 years. But, like I say, this works for my foreseeable future, in 99.9% of the times I ever need to find a day.

I haven't written this up before because I checked years ago and found people had already written about this algorithm, but I think it's worth mentioning now because it's so easy for the vast majority of cases people use for a while to come. BTW, if I want a comprehensive algorithm, I'll probably try Conway's Doomsday Algorithm.

Get on RespectNetwork and get your XRI name.

2014-06-28T07:55:00.000-07:00

Just a little motivation for getting involved with RespectNetwork and grabbing one of their "cloud names" (ie. an XRI) at their great one-time price of $25:

For a while there, I was playing with the APIs for "unhosted" and P2P apps quite a bit, just doing things that seemed fun personally. I played with Kynetx (founded by my BYU professor Phil Windley) and Singly (founded by Jeremie Miller of XMPP fame), both of which are still very worthwhile projects with huge potential (and you can see from my labels that I've posted about them before). Other related projects are redecentralize.org and projectdanube.com and cozy.io. Anyway, the Respect Network in particular is a brainchild of Drummond Reed and it's had a few changes of directions, starting with connect.me, though I look on that activity feed and I don't see much happening there; Drummond Reed and Doc Searls and Kaliya Hamlin and Phil Windley (remember?) are big people in the identity space, eg. the internetidentityworkshop.com conferences, and so I still expect to see big things out of this set of initiatives for owning our own data. Anyway, my hope is to push for these kinds of tools and protocols to help fight the silos and lock-in of Facebook and even Google... on top of the basic infrastructure tools (eg. pack.resetthenet.org).

Saying all that, I realize that it's not very widespread at this point. I think they're laying out the protocols and doing cool stuff, but it's still at the experimentation point, I'd say. But some of the concepts are sticking, eg. these XRI names... I got my first one a few years ago... so I think they're worth getting now.

Building Bitcoin & Litecoin, Mac & Linux

2014-06-08T15:30:00.001-07:00

I'm trying to build my own altcoins (because I want to understand altcoin creation).

First of all, Litecoin is the best place to begin because most altcoin tutorials (eg. here and here and here) use it as the basis. So I started just by downloading Litecoin source and building it.

On Mac:

I started with Homebrew but couldn't ever get past problems with boost:

Undefined symbols for architecture x86_64: "boost::program_options::to_internal(std::string const&)", referenced from: boost::program_options::detail::basic_config_file_iterator<char>::getline(std::string&) in util.o "boost::program_options::detail::common_config_file_iterator::common_config_file_iterator(std::set<std::string std::less="" std::string="">, std::allocator<std::string> > const&, bool)", referenced from: boost::program_options::detail::basic_config_file_iterator<char>::basic_config_file_iterator(std::istream&, std::set<std::string std::less="" std::string="">, std::allocator<std::string> > const&, bool) in util.o "Db::verify(char const*, char const*, std::ostream*, unsigned int)", referenced from: CDBEnv::Verify(std::string, bool (*)(CDBEnv&, std::string)) in db.o CDBEnv::Salvage(std::string, bool, std::vector<std::pair char="" std::allocator="" std::vector="" unsigned=""> >, std::vector<unsigned char="" std::allocator="" unsigned=""> > >, std::allocator<std::pair char="" std::allocator="" std::vector="" unsigned=""> >, std::vector<unsigned char="" std::allocator="" unsigned=""> > > > >&) in db.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [litecoind] Error 1</unsigned></std::pair></unsigned></std::pair></std::string></std::string></char></std::string></std::string></char>

I tried with Bitcoin with Homebrew and finally got it to build, though "make check" failed.
I totally switched to MacPorts and got Bitcoin to build again (including "make check").
OK, but I want Litecoin... and again I get problems with boost:

llvm-g++ -c -stdlib=libstdc++ -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter -g -DMAC_OSX -DMSG_NOSIGNAL=0 -DBOOST_SPIRIT_THREADSAFE -DUSE_UPNP=1 -DUSE_IPV6=1 -I/Users/tlarson/dev/from-elsewhere/litecoin/src/leveldb/include -I/Users/tlarson/dev/from-elsewhere/litecoin/src/leveldb/helpers -DHAVE_BUILD_INFO -I"/Users/tlarson/dev/from-elsewhere/litecoin/src" -I"/Users/tlarson/dev/from-elsewhere/litecoin/src/obj" -I"/usr/local/include" -I"/usr/local/opt/berkeley-db4/include" -I"/usr/local/opt/openssl/include" -MMD -MF obj/alert.d -o obj/alert.o alert.cpp alert.cpp:6:10: fatal error: 'boost/algorithm/string/classification.hpp' file not found #include <boost algorithm="" classification.hpp="" string=""> ^ 1 error generated. make: *** [obj/alert.o] Error 1 </boost>

On Linux (Ubuntu):

Worked, though I had to include all optional items, and also build Berkely DB as instructed in the Bitcoin source and use it here (by setting BDB_INCLUDE_PATH and BDB_LIB_PATH).

I haven't tried Windows yet, since that seems even scarier!

SLC Tech Breakfast on Mar 21

2014-03-14T07:08:00.000-07:00

SLC Tech Breakfast on Fri Mar 21 8:00-9:30 AM downtown at Newmont U. Bagels provided.

coursera at princeton (Josh recommends)

dynamic programming (same as memoization, sounds like)

spring roo (rails-like quick start for Java, if I remember right)

linq (for allowing SQL-like data queries in language), jlinq, jpropel

"clock of complexity"

malbolge: unreadable programming language

Today's CTO Breakfast

2014-02-07T09:37:00.001-08:00

Trent Larson mentioned tool for P2P sharing family histories (familyhistories.info)
Sano Inteiligence for a subdermal patch for monitoring the blood stream
True Crypt (vs Best Crypt), with hidden volumes
BTSync for P2P file distribution
"Scrypt" coin using GPUs vs Bitcoin (w/ SHA256)
Vivian at Gild & Provo Dojo last night about underappreciated Utah developers
SaltStack, which Wade prefers over Puppet
Intel Galileo, running Arduino but also Linux, $60 with power on Amazon, including Wifi connector
playing music on a dodecahedron, drawn on a ping-pong ball with an egg-bot, then icosahedron, and then she talked about a theramin
Espruino, an Arduino-like board using Javascript
NodeRed from Google for graphical design of a node program
Google's purchase of Nest
Scott mentioned using NFC to configure devices, and Kelly Flanagan is doing it
power requirements & parasitic power

Tomorrow's tech breakfast

2014-01-16T10:04:00.001-08:00

Tomorrow morning, 8 AM, downtown: above Jason's Deli at the Gateway.

From Garth: There is a parking lot in front of Jason's Deli (you just have to make sure that the parking space says for gateway office) and the doors to the office are to the right of the entrance to Jason's Deli. My office is in suite 230.

Bagels

Here's other background info.

Yet Another SLC Tech Breakfast

2013-12-13T08:00:00.000-08:00

Anyone using functional programming? (Josh has done Scala)

Josh Bloch (Effective Java) & anonymous types vs Neil Gafter & closures

Tom Clancy's game The Division has an impressive new game engine

TED talk: consequences of game on real life

languages: Dart, Go, Underscore.js

Speed dating with google glass

A command-line testing harness for multiple RESTful HTTP requests

2013-05-04T16:11:00.001-07:00

Tasked with the creation of a quick-and-dirty REST service, I wanted an easy way to throw in a bunch of test data and verify it with the correct response data and HTTP response codes. Most testing tools require some infrastructure and editing through their UI; I wanted to throw data (both input and output) into an easy-to-edit text file. Here's the result.

First, here's the input test data:

POST /entry/ffff/3456
POST /entry/
POST /entry/12
POST /entry/12/qqqq
GET /entry/ffff
GET /entry/fffe
GET /entry/
POST /entry/zz/zyx
POST /entry/az/zyx
POST /entry/34/zyx
POST /entry/AF/zyx
POST /entry/zez/zyx
GET /list/0
GET /list/1

(I put this in the file named "test-input")

Sidebar 1: eyeballing the results

This was actually given to me as the full telnet command, so every entry had "HTTP/1.1" on the end, for example:

POST /entry/ffff/3456 HTTP/1.1

So first iteration was to start my server separately, then run a script that would echo that line and pipe it through "telnet 127.0.0.1 8080". For example, here are the first 2 tests, located inside my "entries.in" file:

sleep 2
echo POST /entry/ffff/3456 HTTP/1.1 # should return a 200 OK response
echo
sleep 2
echo POST /entry/ HTTP/1.1 # should return 400 BAD REQUEST
echo

(Interestingly, those comments at the end of each line are acceptable.)

Then I ran the following command:

. ./entries.in | telnet 127.0.0.1 8080

(Note the "." at the first of the line, meaning to source that file to run the commands inside.)

That works great for me to run all the tests quickly, but I have to visually check the output.

End Sidebar 1

Here is the output expected; of course, only the GET commands result in output.

3456 # GET /entry/ffff
ffff -> 3456 # GET /entry/
ffff -> 3456 # following 4 are generated by GET /entry/
12 -> qqqq
zz -> zyx
az -> zyx
34 -> zyx # following 3 are generated by GET /list/1
AF -> zyx
zez -> zyx

(That is in the file I named "test-output.body.good", without the # commentary.)

And here are the HTTP response codes expected:

HTTP/1.1 200 OK
HTTP/1.1 400 BAD REQUEST
HTTP/1.1 400 BAD REQUEST
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 404 NOT FOUND
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK

(That is in the file I named "test-output.HTTP-response.good")

Now for the scripting. Note that this requires Resty, a very convenient wrapper to access RESTful services via curl.

Here are the commands to run those HTTP inputs into my server and check the body of the output.

# run the HTTP server in the background, throwing away any output
python entries.py > /dev/null 2>&1 &

# save the process ID for that server
PID=$!

# wait for the server to fully start
sleep 1

# prepare resty, without verbose output from curl
resty http://127.0.0.1:8080 -s

# use the contents of the test-input file as one command per line
# (via Resty, which has made GET and POST into valid commands)
. ./test-input > test-output.body.out

# check that output against the expected output

diff test-output.body.good test-output.body.out

# stop the HTTP server
kill $PID

# wait for the server to fully stop
sleep 1

And here is how to do the same to check the HTTP response codes of the output. Note that only the 3 commands after "sleep" are different.

# run the HTTP server in the background, throwing away any output
python entries.py > /dev/null 2>&1 &

# save the process ID for that server
PID=$!

# wait for the server to fully start
sleep 1

# prepare resty, without verbose output and with only the HTTP headers from curl
resty http://127.0.0.1:8080 -s -I

# use the contents of the test-input file as one command per line
# (via Resty, which has made GET and POST into valid commands)
# (Why does it end up in DOS format? Is that curl?! ... and printing "not found" is dumb.)
. ./test2-input 2>&1 | grep HTTP > test2-output.HTTP-response.out

# check that output against the expected output
# (See the previous command for the reason behind --strip-trailing-cr)
diff --strip-trailing-cr test2-output.HTTP-response.good test2-output.HTTP-response.out

# stop the HTTP server
kill $PID

# wait for the server to fully stop
sleep 1

That's it! Now I've got those 3 files (input HTTP commands, output body content, and output HTTP codes) and a script that will run all those inputs and verify the outputs exactly.

Note: as this grows, I've found that I'd prefer to have the input, the output HTTP code, and the output body all next to each other, or maybe on subsequent lines of the same file. But this fit today's use cases!

Setting and retrieving LockerProject data in a local install

2012-04-01T19:05:00.001-07:00

I've been trying to play with LockerProject from Singly, and I'd like to use data other than the built-in types of contacts, links, photos, and places. (You can see one project that motivates me at familyhistories.info.) There are ways to build new connectors and collections that support rich functionality like syncing, but there is also a simple Push API that allows for arbitrary data, so I've started by playing with that. Following are some changes I had to make to get things working.

We can send and retrieve arbitrary data via curl, and those examples work great.

Set:

curl -H "Content-Type: application/json" \  

--data-binary '{"data":[{"id":42,"question":"my test"}]}' \  

http://localhost:8042/push/foo 
 
ok

Get:

curl http://localhost:8042/push/foo/42

{"_id":"4f2752c03f670f3343f7fed0","id":42,"question":"my test"}

Unfortunately, things don't work as smoothly when trying to do it in an app. Let's start with retrieval. First of all, we need get data from the local locker instead of the one at singly.com. The best approach I can think is to tweak the APIClient so that we can specify which host, so instead of "new APIClient()" we can do the following:

new APIClient({baseUrl:'http://localhost:8042'})

Great.

Except now my browser won't retrieve the value via AJAX; Chrome is the most helpful, and it tells me:

Origin null is not allowed by Access-Control-Allow-Origin.

The only way I can figure to get past this is to modify LockerProject. So I've added the following to the Ops/webservice.js file as the first line in the first function argument to express.createServer:

// "*" works for all domains; null and "X-Requested-With" work for file:// URLs in Firefox but not Chrome

res.header("Access-Control-Allow-Origin", "*");

Cool. Now I can retrieve values that I've inserted. This might not be a great solution, and I haven't thought through the security complications so that I can submit it to LockerProject, but I'm just going to live with it on my machine.

Unfortunately, this is where we're stuck. It's easy enough to add a post to insert data, but there is a problem within the parsing of JSON in the locker server: it takes any values as strings, so even though we send an update/insert like the data above with a numeric ID of 42, it ends up inserting some data with a string ID of "42"... and we can't retrieve that value with the typical GET request (above)... in fact, I cannot find any way to retrieve that data through the API. You can see it as it gets processed in the web server and you can see it inside your mongo DB. Most unfortunate.

In summary, to get arbitrary data from your local locker in a browser app:

patch the locker server (see Access-Control-Allow-Origin above)
use the client customizations (demonstrated here in the singly-api-local.js and the test-new-datatype.html files)

To set arbitrary data in your local locker in a browser app... you're out of luck due to the string problem.

Maybe there's a better way...?

Getting results with Singly's "Build An App!"

2012-04-01T10:48:00.001-07:00

The Singly (AKA LockerProject) approach to building an app is pretty simple, but the current instructions didn't work for me locally. (You can see the instructions after logging in to singly.com and then going to the "Build An App!" page.) The difficulty may be that I used my index.html incorrectly, but it was the best I could guess: I simply accessed it directly with a "file:///..." URL. (If anyone knows a better place, I'd love to know; I tried putting it in a separate webserver I've got locally, to no avail.) I can get this to work, but it requires some tweaking.

The symptom in Firefox was a blank page, and in the Javascript console there was an error: "Operation is not supported" on a line with sessionStorage. I found that sessionStorage won't work for local ("file") URLs (thanks to this StackOverflow post).

So I changed the references in the api.js to localStorage and things worked for me. Here is my version: https://github.com/trentlarson/singly-relaxing/blob/5e9cf2c1801b78c130cdc79e84a4cdbf2b3b2deb/singly-api-local.js

It uses a conditional, so I'm hoping it can be used at singly.com as a patch to the default version.

Make:SLC

2012-03-28T19:00:00.000-07:00

In the East half of Make:SLC is the home of the Computer Graphics Museum. (I believe it was Richard Thomson I met.) He highly recommended seeing the Exploratorium in San Francisco.

Scott Lemon came to show off his enclosing for Arduino and other electronics. Other things he mentioned: Patchbase, Thingspeak, X10 for home automation

Details from Cory Doctorow's CCC talk

2012-01-06T11:48:00.000-08:00

I watched Cory Doctorow's talk "The Coming War on General Computation," and I recommend it if you want any specific details, arguing points, and even a good reminder of very bad recent policies when it comes to protecting ourselves from corporate (and government) invasion into our privacy and security.
Video Transcript

The low-level software he mentions for possible abuse by Big Brother is UEFI (Unified Extensible Firmware Interface).

Here are the organizations he mentions near the end (at 29:15) (except the "org" which I cannot find):

EFF eff.org
Bits of Freedom bof.nl
EDRI edri.org
CCC ccc.de
Netzpolitik netzpolitik.org
La Quadrature du Net www.laquadrature.net

BTW, I highly recommend his book "Little Brother".

Tips to Avoid Titanium Desktop Errors and Crashes

2011-12-07T14:12:00.001-08:00

My P2P-Docs project is a desktop app currently written in Titanium where I can code the UI in HTML and JavaScript and the business logic in Ruby. Unfortunately, it's very prone to errors and crashes when things get complicated; fortunately, the problems I've seen have been in the interface between JavaScript and Ruby, and I feel like I can keep progressing with this platform if I follow these conventions.

Only pass strings between JavaScript and Ruby, encoding in JSON strings if necessary.
- In JavaScript, call Ruby methods with String arguments. JavaScript ints become Ruby Floats, so just use Strings to avoid potential confusion; JSON arguments will probably work and become hashes, but then you'll have to beware of the types of all the nested objects... if I need multiple values then I either supply them as more arguments or I call the Ruby method multiple times.
- In Ruby, check arguments for RubyKObject type. Sometimes arguments don't have the expected String type, so you'll want to convert them:
if (term.class.name == "RubyKObject") term = term.toString() end
- In Ruby, return String objects; if necessary, encode in JSON. Here's a simplistic method that works for me:
# takes an argument which is any nesting of String, Array, Hash (and nil) # return a String holding JSON representation of the argument def self.strings_arrays_hashes_json(arg) if (arg == nil) "null" elsif (arg.class.name == "String") result = arg result = result.gsub("\"","\\\"") result = result.gsub("\\","\\\\") result = result.gsub("\/","\\/") result = result.gsub("\b","\\b") result = result.gsub("\f","\\f") result = result.gsub("\n","\\n") result = result.gsub("\r","\\r") result = result.gsub("\t","\\t") "\"" + result + "\"" elsif (arg.class.name == "Array") recurse = arg.map { |elem| strings_arrays_hashes_json elem } "[" + recurse.join(", ") + "]" elsif (arg.class.name == "Hash") hashes = arg.to_a.map { |key, val| "\"#{key}\":#{strings_arrays_hashes_json(val)}" } "{" + hashes.join(", ") + "}" else "#{arg}" end end
- In JavaScript, cast the results to a string (ie. toString()) and parse out the JSON if necessary (ie. JSON-js). It's crazy, but even an unused toString call can make a difference.
- Thankfully, you can trust nulls and nils; they convert to one another well.
In JavaScript, call any Ruby methods before playing with the DOM. I've found that, if I have a lot of DOM manipulation, Ruby calls will work up to some point and then WHAM! after that point you get errors or crashes.

BTW, the direct-to-console debugging is your friend; the Ruby puts calls may not get flushed immediately, but this will:

Titanium.API.print("stuff\n");

When you start working this way, you'll notice that you're really pushed into a paradigm where you do simple visual manipulations in the browser as much as possible, but for any substantive changes to data you do a page-submit to pass the values to the same page, then you run your logic during the page initialization and then you rerender the whole page. It's unfortunate, but now I never have troubles. (... at least very few! Just kidding. I haven't had any mysterious Ruby errors or app crashes wherever I take these approaches.)

BTW, every time I hit a glitch, I look more closely at other approaches... but since I figure every tool will have its issues, I'm still sticking with the devil I know. Feel free to ask me later if I'm still sticking to it.

debugging a Titanium problem

2011-11-19T19:12:00.001-08:00

This is my response to Alan's comment here.

What I'm seeing is that my app will completely stop. Here is a video that shows how it stops.

I'll bet it's tough to get error info from the third-party languages; I'm sure that's where the problem lies, because I put console debug output around lines like this one and I see that it gets up to the Ruby method but no further. (I realize this example is a method... if it would help, I'll try to retrieve a problem involving a variable reference.) Even if I wrap it in a try-catch, the app stops, so it never gets to the catch, and I don't get any other info.

You can duplicate this problem in my app; look on that page for the "Test many repos in app" to see duplication steps. (Note that that is a specific point in time in November; I've worked around the problem, but it's definitely not ideal and the problem still stands.)

Below is a stack from OSX.

It could be interesting to help enhance the interface and error reporting in the Kroll system (I assume that's the third-party language interface); if you have any suggestions for getting started, or for other ways that I can help you, I'm all ears.

Thanks.

____________________________________________
Family History P2P Docs appears to have encountered a fatal error and cannot continue.

The application has collected information about the error in the form
of a detailed error report. If you send the crash report, we will
attempt to resolve this problem.

... then I click on the "Send Report" button to see the following:

____________________________________________
Problem Report for Family History P2P Docs

This report will be sent to Apple automatically.

Problem Details and System Configuration

Process:         Family History P2P Docs [71611]
Path:            /Users/tlarson/Documents/dev/p2pdocs/p2pdocs/Family History P2P Docs/dist/osx/Family History P2P Docs.app/Contents/MacOS/Family History P2P Docs
Identifier:      info.familyhistories.p2pdocs
Version:         ??? (7.0)
Code Type:       X86 (Native)
Parent Process: ??? [1]

Date/Time:       2011-11-18 20:50:29.623 -0700
OS Version:      Mac OS X 10.6.8 (10K549)
Report Version: 6

Interval Since Last Report:          451670 sec
Crashes Since Last Report:           32
Per-App Interval Since Last Report: 31828 sec
Per-App Crashes Since Last Report:   2
Anonymous UUID:                      8EC49F5A-C2D0-4019-9318-8634B3D2552C

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000081be0f79
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Application Specific Information:
objc_msgSend() selector name: localizedDescription

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                   0x97806f87 objc_msgSend + 23
1   info.familyhistories.p2pdocs     0x000221b5 main + 549
2   info.familyhistories.p2pdocs     0x000032ea start + 54

Thread 1: Dispatch queue: com.apple.libdispatch-manager
0   libSystem.B.dylib                 0x96675382 kevent + 10
1   libSystem.B.dylib                 0x96675a9c _dispatch_mgr_invoke + 215
2   libSystem.B.dylib                 0x96674f59 _dispatch_queue_invoke + 163
3   libSystem.B.dylib                 0x96674cfe _dispatch_worker_thread2 + 240
4   libSystem.B.dylib                 0x96674781 _pthread_wqthread + 390
5   libSystem.B.dylib                 0x966745c6 start_wqthread + 30

Thread 2:
0   libSystem.B.dylib                 0x96674412 __workq_kernreturn + 10
1   libSystem.B.dylib                 0x966749a8 _pthread_wqthread + 941
2   libSystem.B.dylib                 0x966745c6 start_wqthread + 30

Thread 3:
0   libSystem.B.dylib                 0x96674412 __workq_kernreturn + 10
1   libSystem.B.dylib                 0x966749a8 _pthread_wqthread + 941
2   libSystem.B.dylib                 0x966745c6 start_wqthread + 30

Thread 4:
0   libSystem.B.dylib                 0x96674412 __workq_kernreturn + 10
1   libSystem.B.dylib                 0x966749a8 _pthread_wqthread + 941
2   libSystem.B.dylib                 0x966745c6 start_wqthread + 30

Thread 5:
0   libSystem.B.dylib                 0x9667caa2 __semwait_signal + 10
1   libSystem.B.dylib                 0x966a89c5 nanosleep$UNIX2003 + 188
2   libSystem.B.dylib                 0x966a8903 usleep$UNIX2003 + 61
3   com.apple.AppKit                  0x9910ae2d -[NSUIHeartBeat _heartBeatThread:] + 2039
4   com.apple.Foundation              0x9404a4c4 -[NSThread main] + 45
5   com.apple.Foundation              0x9404a474 __NSThread__main__ + 1499
6   libSystem.B.dylib                 0x9667c259 _pthread_start + 345
7   libSystem.B.dylib                 0x9667c0de thread_start + 34

Thread 6:
0   libSystem.B.dylib                 0x9664eafa mach_msg_trap + 10
1   libSystem.B.dylib                 0x9664f267 mach_msg + 68
2   com.apple.CoreFoundation          0x952612df __CFRunLoopRun + 2079
3   com.apple.CoreFoundation          0x952603c4 CFRunLoopRunSpecific + 452
4   com.apple.CoreFoundation          0x952601f1 CFRunLoopRunInMode + 97
5   com.apple.Foundation              0x94083224 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 329
6   com.apple.Foundation              0x9404a4c4 -[NSThread main] + 45
7   com.apple.Foundation              0x9404a474 __NSThread__main__ + 1499
8   libSystem.B.dylib                 0x9667c259 _pthread_start + 345
9   libSystem.B.dylib                 0x9667c0de thread_start + 34

Thread 7: com.apple.CFSocket.private
0   libSystem.B.dylib                 0x9666dac6 select$DARWIN_EXTSN + 10
1   com.apple.CoreFoundation          0x952a0c53 __CFSocketManager + 1091
2   libSystem.B.dylib                 0x9667c259 _pthread_start + 345
3   libSystem.B.dylib                 0x9667c0de thread_start + 34

Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x9780c7e2 ebx: 0x0001f0de ecx: 0x9977f99e edx: 0x81be0f59
edi: 0xbfffec80 esi: 0x00223690 ebp: 0xbfffecb8 esp: 0xbfffec28
   ss: 0x0000001f efl: 0x00010286 eip: 0x97806f87   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
cr2: 0x81be0f79

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0x956e2000 - 0x95715fff libTrueTypeScaler.dylib ??? (???) <0F04DAC3-829A-FA1B-E9D0-1E9505713C5C> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libTrueTypeScaler.dylib
0x95716000 - 0x957c4ff3 com.apple.ink.framework 1.3.3 (107) <233A981E-A2F9-56FB-8BDE-C2DEC3F20784> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink
0x96560000 - 0x96596fff libtidy.A.dylib ??? (???) <0FD72C68-4803-4C5B-3A63-05D7394BFD71> /usr/lib/libtidy.A.dylib
0x965de000 - 0x9664dff7 libvMisc.dylib 268.0.1 (compatibility 1.0.0) <595A5539-9F54-63E6-7AAC-C04E1574B050> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
0x9664e000 - 0x967f5ff7 libSystem.B.dylib 125.2.11 (compatibility 1.0.0) <2DCD13E3-1BD1-6F25-119A-3863A3848B90> /usr/lib/libSystem.B.dylib
0x967f6000 - 0x96902ff7 libGLProgrammability.dylib ??? (???) <04D7E5C3-B0C3-054B-DF49-3B333DCDEE22> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib
0x96f98000 - 0x96fc9ff7 libGLImage.dylib ??? (???) <0EE86397-A867-0BBA-E5B1-B800E43FC5CF> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dylib
0x96fca000 - 0x96fcaff7 com.apple.Carbon 150 (152) /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
0x96fcb000 - 0x96febfe7 libresolv.9.dylib 41.0.0 (compatibility 1.0.0) /usr/lib/libresolv.9.dylib
0x96fec000 - 0x96fedff7 com.apple.audio.units.AudioUnit 1.6.7 (1.6.7) <838E1760-F7D9-3239-B3A8-20E25EFD1379> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
0x96fff000 - 0x9736aff7 com.apple.QuartzCore 1.6.3 (227.37) /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
0x9736d000 - 0x97382fff com.apple.ImageCapture 6.1 (6.1) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/ImageCapture.framework/Versions/A/ImageCapture
0x97383000 - 0x9745dfff com.apple.DesktopServices 1.5.11 (1.5.11) <800F2040-9211-81A7-B438-7712BF51DEE3> /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/DesktopServicesPriv
0x97477000 - 0x9747bff7 libGFXShared.dylib ??? (???) <801B2C2C-1692-475A-BAD6-99F85B6E7C25> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGFXShared.dylib
0x9747c000 - 0x9748aff7 com.apple.opengl 1.6.13 (1.6.13) <025A905D-C1A3-B24A-1585-37C328D77148> /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
0x974ec000 - 0x974f2fe7 com.apple.CommerceCore 1.0 (9.1) <521D067B-3BDA-D04E-E1FA-CFA526C87EB5> /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Frameworks/CommerceCore.framework/Versions/A/CommerceCore
0x97801000 - 0x978aefe7 libobjc.A.dylib 227.0.0 (compatibility 1.0.0) <9F8413A6-736D-37D9-8EB3-7986D4699957> /usr/lib/libobjc.A.dylib
0x978af000 - 0x978c3fe7 libbsm.0.dylib ??? (???) <821E415B-6C42-D359-78FF-E892792F8C52> /usr/lib/libbsm.0.dylib
0x978c4000 - 0x978ceff7 com.apple.HelpData 2.0.5 (34.1.1) /System/Library/PrivateFrameworks/HelpData.framework/Versions/A/HelpData
0x978cf000 - 0x978cfff7 com.apple.Accelerate 1.6 (Accelerate 1.6) <3891A689-4F38-FACD-38B2-4BF937DE30CF> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
0x97b05000 - 0x97be5fe7 com.apple.vImage 4.1 (4.1) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
0x97cb8000 - 0x97cbfff3 com.apple.print.framework.Print 6.1 (237.1) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print
0x98dcf000 - 0x98e12ff7 libGLU.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
0x98e64000 - 0x98f58ff7 libiconv.2.dylib 7.0.0 (compatibility 7.0.0) <061ABF36-8BA9-79C1-6CE7-EC69A4998F51> /usr/lib/libiconv.2.dylib
0x98f59000 - 0x9983cff7 com.apple.AppKit 6.6.8 (1038.36) /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x99876000 - 0x998f6feb com.apple.SearchKit 1.3.0 (1.3.0) <2F5DE102-A203-7905-7D12-FCBCF17BAEF8> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchKit.framework/Versions/A/SearchKit
0x998f7000 - 0x99916ff7 com.apple.CoreVideo 1.6.2 (45.6) /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo
0x99917000 - 0x999b2fe7 com.apple.ApplicationServices.ATS 275.19 (???) <9FA31967-CF14-B033-EB8D-570561D12A13> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS
0x99b36000 - 0x99b3aff7 IOSurface ??? (???) /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface
0x99c62000 - 0x99c62ff7 com.apple.Cocoa 6.6 (???) /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa
0x99ceb000 - 0x99e6dfe7 libicucore.A.dylib 40.0.0 (compatibility 1.0.0) /usr/lib/libicucore.A.dylib
0x99e6e000 - 0x9a030feb com.apple.ImageIO.framework 3.0.4 (3.0.4) <027F55DF-7E4E-2310-1536-3F470CB8847B> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
0x9a0e8000 - 0x9a0e8ff7 com.apple.Accelerate.vecLib 3.6 (vecLib 3.6) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
0x9a0e9000 - 0x9a40dfef com.apple.HIToolbox 1.6.5 (???) <21164164-41CE-61DE-C567-32E89755CB34> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
0x9a40e000 - 0x9a448ff7 libcups.2.dylib 2.8.0 (compatibility 2.0.0) <6875335E-0993-0D77-4E80-41763A8477CF> /usr/lib/libcups.2.dylib
0x9a449000 - 0x9a46dff7 libJPEG.dylib ??? (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libJPEG.dylib
0x9a4a8000 - 0x9a4aefff com.apple.CommonPanels 1.2.4 (91) <2438AF5D-067B-B9FD-1248-2C9987F360BA> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPanels.framework/Versions/A/CommonPanels
0x9a4af000 - 0x9a4baff7 libGL.dylib ??? (???) <3E34468F-E9A7-8EFB-FF66-5204BD5B4E21> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
0x9ab3c000 - 0x9ab57ff7 libPng.dylib ??? (???) <25DF2360-BFD3-0165-51AC-0BDAF7899DEC> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libPng.dylib
0x9ab58000 - 0x9ab64ff7 libkxld.dylib ??? (???) <9A441C48-2D18-E716-5F38-CBEAE6A0BB3E> /usr/lib/system/libkxld.dylib
0xffff0000 - 0xffff1fff libSystem.B.dylib ??? (???) <2DCD13E3-1BD1-6F25-119A-3863A3848B90> /usr/lib/libSystem.B.dylib

Model: MacBookPro6,1, BootROM MBP61.0057.B0C, 2 processors, Intel Core i7, 2.66 GHz, 8 GB, SMC 1.57f17
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: APPLE SSD TS256B, 233.76 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0236, 0xfa120000 / 4
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8218, 0xfa113000 / 5
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0xfd110000 / 3

Last 2 SLC Tech Breakfasts

2011-11-18T08:47:00.001-08:00

"Selfish Reasons to Have More Kids" (Trent) surveys twin-adoption studies and asserts that nature surpasses nurture in most long-term qualities of life
EconTalk podcast interviewed that author, and other researchers to get the economists view

Henry Shrapnel invented bombs (Josh)

Recent Ping Identity Summit (Josh, from Rearden Commerce)
- OpenSSL, Josso
- potential for OpenID providers to manage the user's identity

AccountChooser.com is Google's widget for easy site authentication

"Hitchhiker's Guide to The Galaxy", where engineered livestock has desire to be eaten

SOPA is yet another piece of legislation to empower the RIAA to shut down websites

Project VRM by Doc Searles aims to build consumer-oriented identity management
Other consumer-centered projects (which aggregate demand): Google Offers, Groupon.com, HomeRun.com

Interesting projects from Rearden Commerce: enterprises typically use SAML, and there are problems trying to pass customers between sites who shouldn't have info from each other

Wouldn't it be nice to have things centralized! (But that's what we're avoiding.)

Internet Identity Workshop is an influential conference in the identity field

_____________________________________________________________
These notes are from last month:

Ryan: using git submodules (like svn externals) vs subtree merges
Linux started with BitKeeper, then wrote his own git
http://xkcd.com/963/
The daily WTF

The best way to run a company is to not only encourage loyalty and
staying with the company but also encourage people to grow and
possibly leave.

Ryan: open-source RockBox project, with great audio features for old
iPods and trying to migrate it to modern players (iPhone, Android)

Seniors: won't use a computer, but will use email on their phone
'cause it's easier; there's a service that gives you a printer connected
to the network and downloads and prints emails from some account

Using rsync when scp keeps failing

2011-09-21T17:43:00.000-07:00

Sometimes I'm trying to scp a file from a less-than-reliable server that drops my connection so that I can never get the whole thing. Here is Kem's answer to that problem:

#!/usr/bin/env ruby while true do puts `rsync -av --progress --inplace --rsh='ssh' --bwlimit=100 #{ARGV[0]} #{ARGV[1]}` result = $? if (result.exitstatus == 0) puts "file copy done, exiting" break; end puts "retrying again -- result: #{result}" end

SSL installation checkers

2011-09-13T10:09:00.000-07:00

Here are the two SSL checkers recommended by Kem & Makani:

http://www.digicert.com/help/
http://www.sslshopper.com/ssl-checker.html (because Makani says this one found a problem the other one missed)

Today's SLC Tech Breakfast

2011-08-19T09:56:00.001-07:00

Dan: Where is virtual reality?

Video search
One big part is speech recognition Sphinx (CMU) http://cmusphinx.sourceforge.net/
Why store text? There are good reasons (Josh and Matt are doing a project on all this)

Augmented reality
- SixthSense from MIT http://www.pranavmistry.com/projects/sixthsense/
- Dan recommends Robert Heinlein - Double Star

Phones seem to be changing how we do things, eg. calling rather than working independently

The G2X phone is fabulous - Matt

There are headphones that stick near the ear so you can feel vibrations (without bugging someone).

There's a higher ratio of female engineers in India vs America

Other events
- Utah Code Camp http://pcamputah.org/ (though it may just be more ads; not a good impression of Newmont by people)
- Product Camp Utah http://pcamputah.org/
- Roots Tech http://rootstech.familysearch.org/
- UTOS Project Day http://project-day.utos.org/

Chromebook is out, about $500
Google is offering it for about $28/chromebook/year for organizations ($20 for schools)

Google says Javascript is not the bottleneck any more
- Trent is using knockout.js (also looked at backbone.js)
- Matt uses GXT (GWT version of ext.js), though the rendered code can be confusing (with synchronous events)

concatenating lines in a pipe

2011-08-17T19:36:00.000-07:00

I often have to munge multiple lines together, and I finally found a good way:

echo -e "1\n2" | awk '{ ORS="+"; print; }'

Note that this adds the separator on the end, so I have to handle that:

echo -e "1\n2" | awk '{ ORS="+"; print; }' | awk '{ print $1 "0" }' | bc