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PORack rack.input variable getting truncated?
 

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  1. PORack rack.input variable getting truncated?
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    <p>I wrote a piece of Rack Middleware to automatically unzip compressed request bodies. The code seems to be working just fine, but when I plug it into my rails app, I get a failure "Invalid JSON" from ActionController::ParamsParser.</p> <p>As a debugging mechanism, I'm writing both the zipped content, and the unzipped content to a file (to make sure that code is working properly) and I do receive my original JSON document (before the client zips it up).</p> <p>The data I'm posting <em>is</em> JSON data, and the unzipped content is detected as valid JSON from <a href="http://jsonlint.com" rel="noreferrer">http://jsonlint.com</a>.</p> <p>Any ideas what I'm doing wrong?</p> <pre><code>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 </code></pre> <p>Here is the error that I'm getting from the console:</p> <pre><code>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' </code></pre> <p>One last piece of information, I'm inserting this middleware after ActionController::Failsafe.</p> <p><strong>EDIT: Looks like it's not a truncation problem</strong></p> <p>After more digging, it looks like it's not a truncation problem after all. The logs are simply clipping the output so it <em>looks</em> like a truncation issue.</p> <p>At this point I'm not sure why the JSON is coming in as invalid. Do I need to do any manual escaping?</p>
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