Class: Jets::Controller::Middleware::Mimic
- Inherits:
-
Object
- Object
- Jets::Controller::Middleware::Mimic
- Extended by:
- Memoist
- Defined in:
- lib/jets/controller/middleware/mimic/apigw.rb,
lib/jets/controller/middleware/mimic.rb,
lib/jets/controller/middleware/mimic/lambda_context.rb
Overview
Takes a Rack env and converts to ApiGateway event This runs only locally, when not on AWS Lambda Note: Logic in the opposite direction: Jets::Controller::Handler::Apigw#rack_vars
Defined Under Namespace
Classes: Apigw, LambdaContext
Instance Method Summary collapse
- #call(env) ⇒ Object
-
#initialize(app) ⇒ Mimic
constructor
A new instance of Mimic.
- #not_found(env) ⇒ Object
- #on_aws?(env) ⇒ Boolean
- #polymorphic_function ⇒ Object
-
#polymorphic_function? ⇒ Boolean
Never hit when calling polymorphic function on AWS Lambda.
- #routes_error_message(env) ⇒ Object
- #run_polymophic_function ⇒ Object
Constructor Details
#initialize(app) ⇒ Mimic
Returns a new instance of Mimic.
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# File 'lib/jets/controller/middleware/mimic.rb', line 9 def initialize(app) @app = app end |
Instance Method Details
#call(env) ⇒ Object
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# File 'lib/jets/controller/middleware/mimic.rb', line 13 def call(env) matcher = Jets::Router::Matcher.new route = matcher.find_by_env(env) # simpler version does not check constraints return not_found(env) unless route # Make instance available so we dont not have to pass it around. # Also important to assign to instance variables so values are memoized in variables # So the mimic logic work because @env.merge! does not happened # until end. We do not want apigw.controller to create a new controller instance # with a different object_id apigw = Apigw.new(route, env) # takes rack env and converts to API Gateway event structure @controller = apigw.controller @meth = apigw.meth @event = apigw.event @context = apigw.context route = matcher.find_by_request(@controller.request) # need request object to check constraints return not_found(env) unless route if route.to == 'jets/rack#process' # megamode # Bypass the Jets middlewares since it could interfere with the Rack # application's middleware stack. # # Jets sends back a transfer-encoding=chunked. Curling Jets directly works, # but passing the Jets response back through this middleware results in errors. # Disable chunking responses by deleting the transfer-encoding response header. # Would like to understand why this happens this better, if someone can explain please let me know. status, headers, body = @controller.dispatch! # jets/rack_controller headers.delete "transfer-encoding" [status, headers, body] elsif route.to == 'jets/mount#call' # mount route status, headers, body = @controller.dispatch! # jets/mount_controller [status, headers, body] elsif polymorphic_function? run_polymophic_function else # Normal Jets request unless on_aws?(env) # Only set these variables when running locally and not on AWS. # On AWS, these are set by the Jets::Controller::Handler::Apigw#rack_vars env.merge!( 'jets.controller' => @controller, # mimic controller instance 'jets.context' => @context, # mimic context 'jets.event' => @event, # mimic event 'jets.meth' => @meth, ) end @app.call(env) # goes to all middleware all the way to Jets::Controller::Middleware::Main end end |
#not_found(env) ⇒ Object
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# File 'lib/jets/controller/middleware/mimic.rb', line 101 def not_found(env) raise Jets::Controller::RoutingError, "No route matches #{env['PATH_INFO'].inspect}" end |
#on_aws?(env) ⇒ Boolean
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# File 'lib/jets/controller/middleware/mimic.rb', line 84 def on_aws?(env) return true if ENV['ON_AWS'] return false if Jets.env.test? # usually with test we're passing in full API Gateway fixtures with the HTTP_X_AMZN_TRACE_ID return false if ENV['JETS_ELB'] # If we're using an ELB and Jets is inside a container running jets server, we don't want to pretend we're on AWS. on_cloud9 = !!(env['HTTP_HOST'] =~ /cloud9\..*\.amazonaws\.com/) !!env['HTTP_X_AMZN_TRACE_ID'] && !on_cloud9 end |
#polymorphic_function ⇒ Object
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# File 'lib/jets/controller/middleware/mimic.rb', line 69 def polymorphic_function # Abusing Poly to run polymorphic code, should call LambdaExecutor directly # after reworking LambdaExecutor so it has a better interface. Jets::Poly.new(@controller.class, @meth) end |
#polymorphic_function? ⇒ Boolean
Never hit when calling polymorphic function on AWS Lambda. Can only get called with the local server.
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# File 'lib/jets/controller/middleware/mimic.rb', line 64 def polymorphic_function? return false if ENV['_HANDLER'] # slight speed improvement on Lambda polymorphic_function.definition.lang != :ruby end |
#routes_error_message(env) ⇒ Object
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# File 'lib/jets/controller/middleware/mimic.rb', line 92 def (env) = "<h2>404 Error: Route #{env['PATH_INFO'].sub('/','')} not found</h2>" if Jets.env != "production" << "<p>Here are the routes defined in your application:</p>" << "#{routes_table}" end end |
#run_polymophic_function ⇒ Object
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# File 'lib/jets/controller/middleware/mimic.rb', line 76 def run_polymophic_function resp = polymorphic_function.run(@event, @meth) # polymorphic code status = resp['statusCode'] headers = resp['headers'] body = StringIO.new(resp['body']) [status, headers, body] # triplet end |