Support to use Reel with rack applications

[afcapel]

The server simply delegates rack request to a pool of Reel::RackWorkers which include Celluloid, and so each operates in its own thread.

I've also added a simple option parser to change server configuration from the command line. These are the implemented options:

reel <options> <rackup file>
    -p, --port PORT                  Define what port TCP port to bind to (default: 3000)
    -a, --address HOST               bind to HOST address (default: 0.0.0.0)
    -q, --quiet                      Quiet down the output
    -e, --environment ENVIRONMENT    The environment to run the Rack app on (default: development)
    -t, --threads NUM                The number of worker threads (default: 10)
    -r, --rackup FILE                Load Rack config from this file (default: config.ru)
    -h, --help                       Show help

To use with rails, just add the reel gem to your Gemfile and start the server with

rails s reel

[travisbot]

This pull request fails (merged d948d06 into 3f56084).

[travisbot]

This pull request passes (merged 748b2e5 into 3f56084).

[ryanlecompte]

Did you intend to specify a value here for DEFAULT_RACKUP?

[afcapel]

Oops, that's an old constant I no longer use, the default value is already in DEFAULT_OPTIONS.

I've just removed it.

Thanks Ryan!

[ryanlecompte]

Cool. I just reviewed the pull request. Looks great!

[travisbot]

This pull request passes (merged 50bd5c4 into 3f56084).

[travisbot]

This pull request passes (merged 26ebe4e into 3f56084).

[travisbot]

This pull request passes (merged 5163b4d into 3f56084).

[travisbot]

This pull request passes (merged fa4e0ff into 3f56084).

[travisbot]

This pull request passes (merged 74571d0 into 3f56084).

[tarcieri]

Looks good to me! I'll see if I can get it merged today

[tarcieri]

Thanks!

[afcapel]

My pleasure, it's an awesome project!

I am working on fixing the specs and will do a pull request later.

[tarcieri]

Cool, I did some refactoring last night and that's why they're broken. Perhaps they could use a mock connection object for the tests?

[jridgway]

I'm able to start my app with rails s reel, but the first request never finishes and after a few more requests everything just hangs. I am also not able to shut down the server without forcibly killing. I tested this on a new/blank rails app and I had the same outcome, though the new rails app did shut down with Ctrl+C after a long time. Is rack support not ready yet? What's missing that I might help with? Thanks! I'm pretty excited to give this a shot.

[tarcieri]

Running Rails on top of Reel is probably a bad idea, at least until Ruby 2.0. This is because Celluloid uses Fibers and they have small stacks (4kB) whereas Rails and the Rack middleware it uses expects big stacks.

Ruby 2.0 will bring with it configurable fiber stack sizes, at which point Fibers on Rails might be a slightly less bad idea ;)

That said, yes the Rack adapter is a bit half-baked and I expect it has some bugs.

[jridgway]

Thanks, that really helps. I look forward to Ruby 2.0! :)