Escribí una pieza de Rack Middleware para descomprimir automáticamente cuerpos comprimidos de solicitud. Parece que el código funciona bien, pero cuando lo conecto a mi aplicación Rails, obtengo un error "JSON no válido" de ActionController :: ParamsParser.Rack de rack.input variable se trunca?
Como mecanismo de depuración, estoy escribiendo tanto el contenido comprimido como el contenido descomprimido en un archivo (para asegurarme de que el código funciona correctamente) y recibo mi documento JSON original (antes de que el cliente lo comprima)
Los datos que publico son datos JSON, y el contenido descomprimido se detecta como JSON válido desde http://jsonlint.com.
¿Alguna idea de lo que estoy haciendo mal?
class CompressedRequests
def initialize(app)
@app = app
end
def call(env)
input = env['rack.input'].read
#output the zipped data we received
File.open('/Users/ben/Desktop/data.gz', 'w+') do |f|
f.write input
end
if env['REQUEST_METHOD'] =~ /(POST|PUT)/
if env.keys.include? 'HTTP_CONTENT_ENCODING'
new_input = decode(input, env['HTTP_CONTENT_ENCODING'])
env['rack.input'] = StringIO.new(new_input)
#output our decoded data (for debugging)
File.open('/Users/ben/Desktop/data.txt', 'w+') do |f|
f.write env['rack.input'].read
end
env.delete('HTTP_CONTENT_ENCODING')
end
end
env['rack.input'].rewind
status, headers, response = @app.call(env)
return [status, headers, response]
end
def decode(input, content_encoding)
if content_encoding == 'gzip'
Zlib::GzipReader.new(input).read
elsif content_encoding == 'deflate'
Zlib::Inflate.new.inflate new input
else
input
end
end
end
Aquí está el error que estoy recibiendo desde la consola:
Contents::"2010-05-17T12:46:30Z","background":false},{"longitude":-95.38620785000001,"latitude":29.62815358333334,"estimated_speed":14.04305,"timestamp":"2010-05-17T12:46:36Z","background":false},{"longitude":-95.3862767,"latitude":29.62926725,"estimated_speed":39.87791,"timestamp":"2010-05-17T12:46:42Z","background":false},{"longitude":-95.38655023333334,"latitude":29.63051011666666,"estimated_speed":46.09239,"timestamp":"2010-05-17T12:46:49Z","background":false},{"longitude":-95.38676226666666,"latitude":29.63158775,"estimated_speed":47.34936,"timestamp":"2010-05-17T12:46:55Z","background":false},{"longitude":-95.38675346666666,"latitude":29.63219841666666,"estimated_speed":22.54016,"timestamp":"2010-05-17T12:47:03Z","background":false},{"longitude":-95.38675491666666,"latitude":29.63265714999999,"estimated_speed":14.03642,"timestamp":"2010-05-17T12:47:10Z","background":false},{"longitude":-95.38677551666666,"latitude":29.63358661666667,"estimated_speed":29.29489,"timestamp":"2010-05-17T12:47:17Z","background":false},{"longitude":-95.38679026666662,"latitude":29.63466445,"estimated_speed":38.34926,"timestamp":"2010-05-17T12:47:24Z","background":false},{"longitude":-95.38681656666668,"latitude":29.63590941666666,"estimated_speed":44.82093,"timestamp":"2010-05-17T12:47:31Z","background":false},{"longitude":-95.38683366666667,"latitude":29.63679638333334,"estimated_speed":40.21729,"timestamp":"2010-05-17T12:47:37Z","background":false},{"longitude":-95.38685133333333,"latitude":29.63815714999999,"estimated_speed":44.86543,"timestamp":"2010-05-17T12:47:44Z","background":false},{"longitude":-95.3868655
/!\ FAILSAFE /!\ Mon Oct 18 18:18:43 -0500 2010
Status: 500 Internal Server Error
Invalid JSON string
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/json/backends/yaml.rb:14:in `decode'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/json/decoding.rb:11:in `__send__'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/json/decoding.rb:11:in `decode'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/params_parser.rb:42:in `parse_formatted_parameters'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/params_parser.rb:11:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/session/cookie_store.rb:93:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/failsafe.rb:26:in `call'
/Users/ben/projects/safecell/safecellweb/lib/compressed_requests.rb:36:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `synchronize'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:114:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/reloader.rb:34:in `run'
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:108:in `call'
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/rack/static.rb:31:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:46:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:40:in `each'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:40:in `call'
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/rack/log_tailer.rb:17:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/content_length.rb:13:in `call'
/Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/handler/webrick.rb:50:in `service'
Una última pieza de información, estoy insertando este middleware después ActionController :: prueba de fallos.
EDIT: Parece que no es un problema de truncamiento
Después de más de excavación, parece que no es un problema de truncamiento después de todo. Los registros simplemente recortan la salida para que se vea como como un problema de truncamiento.
En este punto, no estoy seguro de por qué el JSON entra como no válido. ¿Debo hacer algún escape manual?
Dude you rock. ¡Eso fue todo! Aquí está el código de trabajo actualizado: http://gist.github.com/635471 –
Cool story bro: D – noodl
Explicación excelente, que cómo debería ser cada uno :) – Pablo