GTFS::InvalidSourceException: Zip end of central directory signature not found

[jelder]

When trying to load Boston's MBTA's feed:

irb(main):002:0> source = GTFS::Source.build('http://developer.mbta.com/lib/gtrtfs/Passages.pb')
GTFS::InvalidSourceException: Zip end of central directory signature not found
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/gtfs-0.2.1/lib/gtfs/url_source.rb:18:in `rescue in load_archive'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/gtfs-0.2.1/lib/gtfs/url_source.rb:8:in `load_archive'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/gtfs-0.2.1/lib/gtfs/source.rb:25:in `initialize'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/gtfs-0.2.1/lib/gtfs/source.rb:48:in `new'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/gtfs-0.2.1/lib/gtfs/source.rb:48:in `build'
    from (irb):2
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.0.rc1/lib/rails/commands/console.rb:90:in `start'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.0.rc1/lib/rails/commands/console.rb:9:in `start'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.0.rc1/lib/rails/commands/commands_tasks.rb:69:in `console'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.0.rc1/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.0.rc1/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in `require'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in `block in require'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:232:in `load_dependency'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:247:in `require'
    from /Users/jacob/code/transit/bin/rails:8:in `<top (required)>'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in `load'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in `block in load'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:232:in `load_dependency'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.0.rc1/lib/active_support/dependencies.rb:241:in `load'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/jacob/.rbenv/versions/2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

More details about their feed here: http://realtime.mbta.com/portal http://realtime.mbta.com/Portal/Content/Documents/MBTA-realtime_DeveloperDocumentation_v1.0.4_2013-11-05.pdf

[nerdEd]

It looks like you're trying to feed it a GTRFS feed instead of a regular GTFS feed. This library doesn't currently support the real time stuff. Let me know if I'm mistaken in what you're trying to do.

I'd like to add support for the realtime feeds, but I don't have a lot of time to work on this right now. Would love a PR : )

[jelder]

Thanks, Ed. I later discovered that protoc was able to output Ruby, so I'm set now.

[nerdEd]

Awesome! I hadn't looked into the realtime stuff that much and came to similar conclusions myself while researching it last night. It seems like there probably isn't any reason to implement realtime support as part of the gem.