51 lines
1.7 KiB
Ruby
51 lines
1.7 KiB
Ruby
module ActionDispatch
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# Provide callbacks to be executed before and after the request dispatch.
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#
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# It also provides a to_prepare callback, which is performed in all requests
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# in development by only once in production and notification callback for async
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# operations.
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#
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class Callbacks
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include ActiveSupport::Callbacks
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define_callbacks :call, :terminator => "result == false", :rescuable => true
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define_callbacks :prepare, :scope => :name
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# Add a preparation callback. Preparation callbacks are run before every
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# request in development mode, and before the first request in production mode.
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#
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# If a symbol with a block is given, the symbol is used as an identifier.
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# That allows to_prepare to be called again with the same identifier to
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# replace the existing callback. Passing an identifier is a suggested
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# practice if the code adding a preparation block may be reloaded.
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def self.to_prepare(*args, &block)
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if args.first.is_a?(Symbol) && block_given?
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define_method :"__#{args.first}", &block
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set_callback(:prepare, :"__#{args.first}")
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else
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set_callback(:prepare, *args, &block)
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end
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end
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def self.before(*args, &block)
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set_callback(:call, :before, *args, &block)
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end
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def self.after(*args, &block)
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set_callback(:call, :after, *args, &block)
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end
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def initialize(app, prepare_each_request = false)
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@app, @prepare_each_request = app, prepare_each_request
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run_callbacks(:prepare)
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end
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def call(env)
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run_callbacks(:call) do
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run_callbacks(:prepare) if @prepare_each_request
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@app.call(env)
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end
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end
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end
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end
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