module Goliath::Rack::Validator

Constants

ERROR

Public Instance Methods

safely(env, headers={}) { || ... } click to toggle source

Execute a block of code safely.

If the block raises any exception that derives from Goliath::Validation::Error (see specifically those in goliath/validation/standard_http_errors.rb), it will be turned into the corresponding 4xx response with a corresponding message.

If the block raises any other kind of error, we log it and return a less-communicative 500 response.

@example

# will convert the ForbiddenError exception into a 403 response
# and an uncaught error in do_something_risky! into a 500 response
safely(env, headers) do
  raise ForbiddenError unless account_info['valid'] == true
  do_something_risky!
  [status, headers, body]
end

@param env [Goliath::Env] The current request env @param headers [Hash] Response headers to preserve in an error response

# File lib/actn/api/goliath/validator.rb, line 41
def safely(env, headers={})
  begin
    yield
  rescue Goliath::Validation::Error => e
    validation_error(e.status_code, e.message, headers)
  rescue Exception => e
    env.logger.error(e.message)
    env.logger.error(e.backtrace.join("\n"))
    validation_error(500, e.message, headers)
  end
end
validation_error(status_code, msg, headers={}) click to toggle source

@param status_code [Integer] HTTP status code for this error. @param msg [String] message to inject into the response body. @param headers [Hash] Response headers to preserve in an error response;

(the Content-Length header, if any, is removed)
# File lib/actn/api/goliath/validator.rb, line 13
def validation_error(status_code, msg, headers={})
  headers.delete('Content-Length')
  [status_code, headers, Oj.dump({ERROR => msg})]
end