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# Builds an anonymous class that represents a single Lambda function from code
# in app/functions.
#
# The build method returns an anonymous class using Class.new that contains
# the methods defined in the app/functions/hello.rb code.
#
# Ruby Class.new docs:
#
# Creates a new anonymous (unnamed) class with the given superclass (or
# Object if no parameter is given). You can give a class a name by
# assigning the class object to a constant.
# http://ruby-doc.org/core-2.1.1/Class.html#method-c-new
#
# So assigning the result of build to a constant makes for a prettier
# class name. Example:
#
# constructor = FunctionConstructor.new(code_path)
# HelloFunction = constructor.build
#
# The class name will be HelloFunction instead of (anonymous). Then usage would
# be:
#
# hello_function = HelloFunction.new
# hello_function(hello_function.handler, event, context)
#
# Or call with the process class method:
#
# HelloFunction.process(event, context, "world")
module Jets::Lambda
class FunctionConstructor
def initialize(code_path)
@code_path = "#{Jets.root}/#{code_path}"
end
def build
code = IO.read(@code_path)
function_klass = Class.new(Jets::Lambda::Function)
function_klass.module_eval(code, @code_path)
adjust_definitions(function_klass)
function_klass # assign this to a Constant for a pretty class name
end
# For anonymous classes method_added during definition registration contains ""
# for the class name. We adjust it here.
def adjust_definitions(klass)
class_name = @code_path.to_s.sub(/.*\/functions\//,'').sub(/\.rb$/, '')
class_name = class_name.camelize
klass.definitions.each do |definition|
definition.class_name = class_name
definition.type = "function"
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems