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POProblems with character encoding in Resque
 

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  1. POProblems with character encoding in Resque
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    <p>I have a series of JSON messages that I need to process and I've run into some trouble with character encodings. I retrieve this message from a RabbitMQ queue like so:</p> <pre><code>@data = [] @queue.pop do |metadata, payload| parsed_message = JSON.parse(payload) @data &lt;&lt; parsed_message end </code></pre> <p>I then process them using Resque and enqueue them like so:</p> <pre><code>Resque.enqueue(Worker, @data) </code></pre> <p>When I run the worker it throws this error:</p> <pre><code>** [16:06:13 2012-09-14] 5375: Error reserving job: #&lt;Encoding::InvalidByteSequenceError: "\xC3" on US-ASCII&gt; ** [16:06:13 2012-09-14] 5375: /usr/local/lib/ruby/1.9.1/json/common.rb:148:in `encode' /usr/local/lib/ruby/1.9.1/json/common.rb:148:in `initialize' /usr/local/lib/ruby/1.9.1/json/common.rb:148:in `new' /usr/local/lib/ruby/1.9.1/json/common.rb:148:in `parse' /usr/local/lib/ruby/gems/1.9.1/gems/multi_json-1.3.6/lib/multi_json/adapters/json_common.rb:7:in `load' /usr/local/lib/ruby/gems/1.9.1/gems/multi_json-1.3.6/lib/multi_json.rb:93:in `load' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/helpers.rb:38:in `decode' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque.rb:149:in `pop' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/job.rb:100:in `reserve' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque.rb:303:in `reserve' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/worker.rb:209:in `block in reserve' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/worker.rb:207:in `each' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/worker.rb:207:in `reserve' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/worker.rb:136:in `block in work' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/worker.rb:133:in `loop' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/worker.rb:133:in `work' /usr/local/lib/ruby/gems/1.9.1/gems/resque-1.22.0/lib/resque/tasks.rb:36:in `block (2 levels) in &lt;top (required)&gt;' /usr/local/lib/ruby/1.9.1/rake/task.rb:205:in `call' /usr/local/lib/ruby/1.9.1/rake/task.rb:205:in `block in execute' /usr/local/lib/ruby/1.9.1/rake/task.rb:200:in `each' /usr/local/lib/ruby/1.9.1/rake/task.rb:200:in `execute' /usr/local/lib/ruby/1.9.1/rake/task.rb:158:in `block in invoke_with_call_chain' /usr/local/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize' /usr/local/lib/ruby/1.9.1/rake/task.rb:151:in `invoke_with_call_chain' /usr/local/lib/ruby/1.9.1/rake/task.rb:144:in `invoke' /usr/local/lib/ruby/1.9.1/rake/application.rb:116:in `invoke_task' /usr/local/lib/ruby/1.9.1/rake/application.rb:94:in `block (2 levels) in top_level' /usr/local/lib/ruby/1.9.1/rake/application.rb:94:in `each' /usr/local/lib/ruby/1.9.1/rake/application.rb:94:in `block in top_level' /usr/local/lib/ruby/1.9.1/rake/application.rb:133:in `standard_exception_handling' /usr/local/lib/ruby/1.9.1/rake/application.rb:88:in `top_level' /usr/local/lib/ruby/1.9.1/rake/application.rb:66:in `block in run' /usr/local/lib/ruby/1.9.1/rake/application.rb:133:in `standard_exception_handling' /usr/local/lib/ruby/1.9.1/rake/application.rb:63:in `run' /usr/local/bin/rake:32:in `&lt;main&gt;' rake aborted! </code></pre> <p>I've wrapped all the code in the perform function from the worker in a begin/rescue block, to try to catch the exception but to no avail which leads me to think that it's from inside Resque somewhere.</p> <p>I've tried enqueueing the Resque worker with the raw data and then parse it inside the worker into JSON and setting an UTF-8 encoding:</p> <pre><code>raw_data.each do |msg| msg = msg.encode("UTF-8", :invalid =&gt; :replace, :undef =&gt; :replace, :replace =&gt; "") parsed_msg = JSON.parse(msg) rescue nil next if parsed_msg.nil? parsed_data &lt;&lt; parsed_msg end </code></pre> <p>and I still get the same error. It's not always the same character, sometimes it's \xC2 or \xD8 if I remember correctly</p> <p>Any ideas?</p>
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