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POAccessing Sinatra application scope from Rake task
 

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  1. POAccessing Sinatra application scope from Rake task
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    <p>I have a global variable in a Sinatra application that I want to update with a scheduled task from my Rakefile. Note that the application is hosted on Heroku. I have set up helpers in order to access this variable.</p> <pre><code>get '/' do @@var end helpers do def get_var return @@var end def set_var(value) @@var = value end end </code></pre> <p>Here is the task in my Rakefile:</p> <pre><code>task :do_something do Sinatra::Application.set_var(get_data) end def get_data # Retrieve value from external source ... return val end </code></pre> <p>The problem I run into is that the task executes properly, but the variable in the Sinatra application is never updated. I assume this is because calling <code>Sinatra::Application</code> from within the Rakefile actually creates a separate instance of the application from the primary instance that I am trying to update.</p> <p>I want to know if their is a way to access the scope of the running Sinatra web app from within a Rakefile task.</p> <p>*Note: I could just write the value retrieved in the scheduled task to a database and then access it from the Sinatra app, but that would be overkill because this variable is updated so infrequently but retrieved so regularly that I would prefer to keep it in memory for easier access. I have looked into Memcache and Redis in order to avoid turning to a database, but again I feel that this would be excessive for a single value. Feel free to disagree with this.</p> <p>EDIT: In regards to Alexey Sukhoviy's comment, Heroku does not allow writing to files outside of the tmp directories, and these are not kept alive long enough to satisfy the needs of the application.</p>
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    1. USCalMlynarczyk
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    1. COI propose you such solution: Save the value of this variable into some file by rake task. And than read this variable from this file at your Sinatra app.
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      1. USsuhovius
    2. COI appreciate the attempt, but this was actually what I was doing in my dev environment before I found that problems arose when deployed to Heroku. See my question edits for more details.
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