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@@ -178,4 +178,6 @@ danielaquino, macournoyer.
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  - Fix a bug in pr_eventmachine for outbound_q
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  - Refactors to take some of the use of defer out of tests.
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  - Fixes in EM.defer under start/stop conditions. Reduced scope of threads.
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-23Sep08: Added patch from tmm1 to avoid popen errors on exit.
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\ No newline at end of file
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+23Sep08: Added patch from tmm1 to avoid popen errors on exit.
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+30Sep08: Added File.exists? checks in the args for start_tls, as suggested by
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+  Brian Lopez (brianmario).
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\ No newline at end of file

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@@ -172,6 +172,8 @@ require 'shellwords'
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 #
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 # 
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 module EventMachine
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+  class FileNotFoundException < Exception; end
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+  
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   class << self
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     attr_reader :threadpool
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   end
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@@ -1552,11 +1554,16 @@ class Connection
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   # behaved than the ones for raw chunks of memory.
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   #
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   def start_tls args={}
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-		EventMachine::set_tls_parms(
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-			@signature,
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-			args[:private_key_file] || "",
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-			args[:cert_chain_file] || ""
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-		)
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+	  priv_key, cert_chain = args.values_at(:private_key_file, :cert_chain_file)
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+	  
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+	  [priv_key, cert_chain].each do |file|
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+	    next if file.nil? or file.empty?
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+	    raise FileNotFoundException, 
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+	      "Could not find #{file} for start_tls" unless File.exists? file
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+    end
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+		
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+		EventMachine::set_tls_parms(@signature, priv_key || '', cert_chain || '')
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+		
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     EventMachine::start_tls @signature
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   end
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