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module Startback
module Web
#
# This Rack middleware catches all known exceptions raised by sublayers
# in the Rack chain. Those exceptions are converted to proper HTTP error
# codes and friendly error messages encoded in json.
#
# Please check the Errors module about status codes used for each Startback
# error.
#
# This class aims at being used as top level of a Rack chain.
#
# Examples:
#
# Rack::Builder.new do
# use Startback::Web::Shield
# end
#
class Shield < Rack::Robustness
include Errors
self.no_catch_all
self.content_type 'application/json'
# Decoding errors from json and csv are considered user's fault
self.on(Finitio::TypeError){ 400 }
self.on(::NotImplementedError){ 501 }
# Various other codes for the framework specific error classes
self.on(Startback::Errors::Error) {|ex|
ex.class.status
}
# A bit of logic to choose the best error message for the user
# according to the error class
self.body{|ex|
body_for(ex).to_json
}
def body_for(ex)
ex = ex.root_cause if ex.is_a?(Finitio::TypeError)
body = { code: ex.class.name, description: ex.message }
return body unless ex.is_a?(Startback::Errors::Error)
return body unless ex.has_causes?
body[:causes] = ex.causes
.filter{|cause|
cause.is_a?(Startback::Errors::Error)
}
.map{|cause|
body_for(cause)
}
body
end
end # class Shield
end # module Web
end # module Startback
Version data entries
17 entries across 17 versions & 3 rubygems