{"id":7280,"date":"2014-06-03T23:34:48","date_gmt":"2014-06-03T23:34:48","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2014\/06\/03\/debugging-osascript-execution-from-within-a-ruby-daemon-collection-of-common-programming-errors\/"},"modified":"2014-06-03T23:34:48","modified_gmt":"2014-06-03T23:34:48","slug":"debugging-osascript-execution-from-within-a-ruby-daemon-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2014\/06\/03\/debugging-osascript-execution-from-within-a-ruby-daemon-collection-of-common-programming-errors\/","title":{"rendered":"Debugging osascript execution from within a ruby daemon-Collection of common programming errors"},"content":{"rendered":"

I have a need to frequently run an applescript on my web server. As the server is running rails, and I need access to my models before and after running the script, I thought that a daemon (via the daemons gem) might be appropriate.<\/p>\n

In theory this is fairly easy. Below is a simplified example.<\/p>\n

#!\/usr\/bin\/env ruby\n\nENV[\"RAILS_ENV\"] ||= \"development\"\n\nrequire File.dirname(__FILE__) + \"\/..\/..\/config\/application\"\nRails.application.require_environment!\n\n$running = true\nSignal.trap(\"TERM\") do \n  $running = false\nend\n\nwhile($running) do\n\n  Rails.logger.info \"Daemon running at #{Time.now}.\\n\"\n\n  # sanity check\n  %x{touch \/foo.txt}\n\n  # this stops working after a while\n  result = %x{\/usr\/bin\/osascript -s o \/path\/to\/the\/script.scpt}\n\n  # under normal operation, my applescript spits out a string result\n  Rails.logger.info \"Result: #{result}.\\n\"\n\n  sleep 30\nend\n<\/code><\/pre>\n
For testing purposes I’ve replaced the (somewhat long and time consuming) production applescript with a one-liner. Here it is, in all its glory:<\/p>\n
\"It Worked!\"\n<\/code><\/pre>\n
Because applescript treats the last line of the script as a return statement, this string gets passed into my result<\/code> variable and ultimately logged in rails.<\/p>\n
This works great – for a while. Eventually though (typically after several hours) the osascript<\/code> line stops returning results. The daemon is<\/em> still running but the osascript<\/code> line, for all I can tell, is completely failing without explanation.<\/p>\n
I can say with certainty that the daemon itself has not died because<\/p>\n
    \n
  • The rails log entries appear at correct intervals, and<\/li>\n
  • My sanity check of “foo.txt” regularly updates its last modified time stamp.<\/li>\n<\/ul>\n
    I thought I’d post an update to this in case anyone out there is having a similar problem. First off, I’ve found a workaround. Its an ugly hack for sure, but it gets the job done and it doesn’t crash every 2 hours. What I’m doing is establishing an ssh connection every time the job is run, which effectively lets the script run on a clean session.<\/p>\n
    Net::SSH.start('127.0.0.1', 'username', :password => 'password') do |ssh|\n  result = ssh.exec!('\/usr\/bin\/osascript -s o \/path\/to\/the\/script.scpt') \nend\n<\/code><\/pre>\n
    And secondly, I’ve found a large number of crash reports in my ~\/Library\/Logs\/DiagnosticReports directory. More and more I’m starting to believe that this whole ordeal has to do with some kind of session timeout or expiration.<\/p>\n
    Process:         osascript [24884]\nPath:            \/usr\/bin\/osascript\nIdentifier:      osascript\nVersion:         ??? (???)\nCode Type:       X86-64 (Native)\nParent Process:  ruby [24868]\n\nDate\/Time:       2011-02-03 16:40:28.526 -0500\nOS Version:      Mac OS X 10.6.6 (10J567)\nReport Version:  6\n\nException Type:  EXC_CRASH (SIGABRT)\nException Codes: 0x0000000000000000, 0x0000000000000000\nCrashed Thread:  0  Dispatch queue: com.apple.main-thread\n\nApplication Specific Information:\nabort() called\nLaunchServices: GetOurLSSessionIDInit() returned err #1, securitySessionID == 0x0, vers=10600000 uid=501 euid=501web1.local] [Se\n\/Users\/greg\/Applescript\/fbbuildutil.scpt\n\nThread 0 Crashed:  Dispatch queue: com.apple.main-thread\n0   libSystem.B.dylib               0x00007fff86fd6616 __kill + 10\n1   libSystem.B.dylib               0x00007fff87076cca abort + 83\n2   com.apple.LaunchServices        0x00007fff82faec84 GetOurLSSessionIDInit() + 298\n3   libSystem.B.dylib               0x00007fff86fa08da pthread_once + 95\n4   com.apple.LaunchServices        0x00007fff82faf29b SetupCoreApplicationServicesCommunicationPort() + 1343\n5   com.apple.LaunchServices        0x00007fff82faf68d getProcessDispatchTable() + 19\n6   com.apple.LaunchServices        0x00007fff82fb17a5 LSClientSideSharedMemory::GetClientSideSharedMemory(LSSessionID, bool) + 187\n7   com.apple.LaunchServices        0x00007fff82fb1e87 _LSCopyApplicationInformationItem + 43\n8   com.apple.AE                    0x00007fff8722b735 aeGetThisProcess() + 49\n9   com.apple.AE                    0x00007fff8722b6df AEEventImpl::initializeData() + 89\n10  com.apple.AE                    0x00007fff8722b5c4 AEEventImpl::AEEventImpl(unsigned int, unsigned int, AEDesc const*, short, int) + 76\n11  com.apple.AE                    0x00007fff8722f33e AECreateAppleEvent + 88\n12  osascript                       0x0000000100001a42 0x100000000 + 6722\n13  osascript                       0x0000000100000fa0 0x100000000 + 4000\n\nThread 1:  Dispatch queue: com.apple.libdispatch-manager\n0   libSystem.B.dylib               0x00007fff86fa116a kevent + 10\n1   libSystem.B.dylib               0x00007fff86fa303d _dispatch_mgr_invoke + 154\n2   libSystem.B.dylib               0x00007fff86fa2d14 _dispatch_queue_invoke + 185\n3   libSystem.B.dylib               0x00007fff86fa283e _dispatch_worker_thread2 + 252\n4   libSystem.B.dylib               0x00007fff86fa2168 _pthread_wqthread + 353\n5   libSystem.B.dylib               0x00007fff86fa2005 start_wqthread + 13\n\nThread 2:\n0   libSystem.B.dylib               0x00007fff86fa1f8a __workq_kernreturn + 10\n1   libSystem.B.dylib               0x00007fff86fa239c _pthread_wqthread + 917\n2   libSystem.B.dylib               0x00007fff86fa2005 start_wqthread + 13\n\nThread 0 crashed with X86 Thread State (64-bit):\n  rax: 0x0000000000000000  rbx: 0x00000000000001f5  rcx: 0x00007fff5fbfb378  rdx: 0x0000000000000000\n  rdi: 0x0000000000006134  rsi: 0x0000000000000006  rbp: 0x00007fff5fbfb390  rsp: 0x00007fff5fbfb378\n   r8: 0x000000010011d740   r9: 0x00000001001fc0a4  r10: 0x00007fff86fd2656  r11: 0x0000000000000202\n  r12: 0x00007fff5fbfb3c0  r13: 0x00007fff703ce328  r14: 0x00007fff82faeb5a  r15: 0x00007fff70c465c0\n  rip: 0x00007fff86fd6616  rfl: 0x0000000000000202  cr2: 0x00000001000f8000\n\nBinary Images:\n       0x100000000 -        0x100002ff7 +osascript ??? (???)  \/usr\/bin\/osascript\n       0x1000f1000 -        0x1000f1fff  com.apple.applescript.component 2.1.2 (2.1.2)  \/System\/Library\/Components\/AppleScript.component\/Contents\/MacOS\/AppleScript\n       0x100419000 -        0x1004adfe7  com.apple.applescript 2.1.2 (2.1.2)  \/System\/Library\/PrivateFrameworks\/AppleScript.framework\/Versions\/A\/AppleScript\n    0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???)  \/usr\/lib\/dyld\n    0x7fff8011d000 -     0x7fff8011efff  liblangid.dylib ??? (???)  \/usr\/lib\/liblangid.dylib\n    0x7fff8016d000 -     0x7fff8046bfe7  com.apple.HIToolbox 1.6.4 (???)  \/System\/Library\/Frameworks\/Carbon.framework\/Versions\/A\/Frameworks\/HIToolbox.framework\/Versions\/A\/HIToolbox\n    0x7fff80472000 -     0x7fff804befff  libauto.dylib ??? 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(???)  \/System\/Library\/Frameworks\/OpenGL.framework\/Versions\/A\/Libraries\/libCoreVMClient.dylib\n    0x7fff813ea000 -     0x7fff813fefff  libGL.dylib ??? (???)  \/System\/Library\/Frameworks\/OpenGL.framework\/Versions\/A\/Libraries\/libGL.dylib\n    0x7fff81480000 -     0x7fff814b9fef  libcups.2.dylib 2.8.0 (compatibility 2.0.0)  \/usr\/lib\/libcups.2.dylib\n    0x7fff816aa000 -     0x7fff816f4ff7  com.apple.Metadata 10.6.3 (507.15)  \/System\/Library\/Frameworks\/CoreServices.framework\/Versions\/A\/Frameworks\/Metadata.framework\/Versions\/A\/Metadata\n    0x7fff8185b000 -     0x7fff81876ff7  com.apple.openscripting 1.3.1 (???)  \/System\/Library\/Frameworks\/Carbon.framework\/Versions\/A\/Frameworks\/OpenScripting.framework\/Versions\/A\/OpenScripting\n    0x7fff818b9000 -     0x7fff81901ff7  libvDSP.dylib 268.0.1 (compatibility 1.0.0)  \/System\/Library\/Frameworks\/Accelerate.framework\/Versions\/A\/Frameworks\/vecLib.framework\/Versions\/A\/libvDSP.dylib\n    0x7fff81940000 -     0x7fff8194ffff  com.apple.NetFS 3.2.1 (3.2.1)  \/System\/Library\/Frameworks\/NetFS.framework\/Versions\/A\/NetFS\n    0x7fff81950000 -     0x7fff81a67fef  libxml2.2.dylib 10.3.0 (compatibility 10.0.0)  \/usr\/lib\/libxml2.2.dylib\n    0x7fff81a98000 -     0x7fff81b51fff  libsqlite3.dylib 9.6.0 (compatibility 9.0.0)  \/usr\/lib\/libsqlite3.dylib\n    0x7fff81b52000 -     0x7fff81c07fe7  com.apple.ColorSync 4.6.3 (4.6.3)  \/System\/Library\/Frameworks\/ApplicationServices.framework\/Versions\/A\/Frameworks\/ColorSync.framework\/Versions\/A\/ColorSync\n    0x7fff81c08000 -     0x7fff81c33ff7  libxslt.1.dylib 3.24.0 (compatibility 3.0.0)  \/usr\/lib\/libxslt.1.dylib\n    0x7fff81e28000 -     0x7fff81e59fff  libGLImage.dylib ??? 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    I have a need to frequently run an applescript on my web server. As the server is running rails, and I need access to my models before and after running the script, I thought that a daemon (via the daemons gem) might be appropriate. In theory this is fairly easy. Below is a simplified example. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7280","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/7280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=7280"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/7280\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=7280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=7280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=7280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}