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module ActionController #:nodoc:
# Actions that fail to perform as expected throw exceptions. These exceptions can either be rescued for the public view
# (with a nice user-friendly explanation) or for the developers view (with tons of debugging information). The developers view
# is already implemented by the Action Controller, but the public view should be tailored to your specific application. So too
# could the decision on whether something is a public or a developer request.
#
# You can tailor the rescuing behavior and appearance by overwriting the following two stub methods.
module Rescue
def self.append_features(base) #:nodoc:
super
base.class_eval do
alias_method :perform_action_without_rescue, :perform_action
alias_method :perform_action, :perform_action_with_rescue
end
end
protected
# Exception handler called when the performance of an action raises an exception.
def rescue_action(exception)
log_error(exception) unless logger.nil?
if consider_all_requests_local || local_request?
rescue_action_locally(exception)
else
rescue_action_in_public(exception)
end
end
# Overwrite to implement custom logging of errors. By default logs as fatal.
def log_error(exception) #:doc:
if ActionView::TemplateError === exception
logger.fatal(exception.to_s)
else
logger.fatal(
"\n\n#{exception.class} (#{exception.message}):\n " +
clean_backtrace(exception).join("\n ") +
"\n\n"
)
end
end
# Overwrite to implement public exception handling (for requests answering false to <tt>local_request?</tt>).
def rescue_action_in_public(exception) #:doc:
render_text "<html><body><h1>Application error (Rails)</h1></body></html>"
end
# Overwrite to expand the meaning of a local request in order to show local rescues on other occurances than
# the remote IP being 127.0.0.1. For example, this could include the IP of the developer machine when debugging
# remotely.
def local_request? #:doc:
@request.remote_addr == "127.0.0.1"
end
# Renders a detailed diagnostics screen on action exceptions.
def rescue_action_locally(exception)
@exception = exception
@rescues_path = File.dirname(__FILE__) + "/templates/rescues/"
add_variables_to_assigns
@contents = @template.render_file(template_path_for_local_rescue(exception), false)
@headers["Content-Type"] = "text/html"
render_file(rescues_path("layout"), "500 Internal Error")
end
private
def perform_action_with_rescue #:nodoc:
begin
perform_action_without_rescue
rescue Exception => exception
rescue_action(exception)
end
end
def rescues_path(template_name)
File.dirname(__FILE__) + "/templates/rescues/#{template_name}.rhtml"
end
def template_path_for_local_rescue(exception)
rescues_path(
case exception
when MissingTemplate then "missing_template"
when UnknownAction then "unknown_action"
when ActionView::TemplateError then "template_error"
else "diagnostics"
end
)
end
def clean_backtrace(exception)
base_dir = File.expand_path(File.dirname(__FILE__) + "/../../../../")
exception.backtrace.collect { |line| line.gsub(base_dir, "").gsub("/public/../config/environments/../../", "").gsub("/public/../", "") }
end
end
end
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