Wednesday, March 28, 2012
Make:SLC
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
Friday, January 6, 2012
Details from Cory Doctorow's CCC talk
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".
Wednesday, December 7, 2011
Tips to Avoid Titanium Desktop Errors and Crashes
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.
BTW, the direct-to-console debugging is your friend; the Ruby puts calls may not get flushed immediately, but this will:
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.
- 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.
Saturday, November 19, 2011
debugging a Titanium problem
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.
____________________________________________
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
Binary Images:
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0x954a0000 - 0x954a0ff7 liblangid.dylib ??? (???)
0x954d2000 - 0x955d3fe7 libxml2.2.dylib 10.3.0 (compatibility 10.0.0)
0x955d4000 - 0x955d8ff7 libGIF.dylib ??? (???) <2123645B-AC89-C4E2-8757-85834CAE3DD2> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
0x955d9000 - 0x9561dff3 com.apple.coreui 2 (114) <2234855E-3BED-717F-0BFA-D1A289ECDBDA> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
0x9561e000 - 0x956b0fe7 com.apple.print.framework.PrintCore 6.3 (312.7) <7410D1B2-655D-68DA-D4B9-2C65747B6817> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore
0x956d3000 - 0x956e1fe7 libz.1.dylib 1.2.3 (compatibility 1.0.0) <33C1B260-ED05-945D-FC33-EF56EC791E2E> /usr/lib/libz.1.dylib
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)
0x96fcb000 - 0x96febfe7 libresolv.9.dylib 41.0.0 (compatibility 1.0.0)
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)
0x9736d000 - 0x97382fff com.apple.ImageCapture 6.1 (6.1)
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)
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)
0x97cb8000 - 0x97cbfff3 com.apple.print.framework.Print 6.1 (237.1)
0x98dcf000 - 0x98e12ff7 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)
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)
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 ??? (???)
0x99c62000 - 0x99c62ff7 com.apple.Cocoa 6.6 (???)
0x99ceb000 - 0x99e6dfe7 libicucore.A.dylib 40.0.0 (compatibility 1.0.0)
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)
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 ??? (???)
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
Friday, November 18, 2011
Last 2 SLC Tech Breakfasts
"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
Wednesday, September 21, 2011
Using rsync when scp keeps failing
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:
Tuesday, September 13, 2011
SSL installation checkers
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)
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