Better: Rescue ENOENT error writing into /tmp (#16)

* Better: Rescue ENOENT error writing into /tmp

* .log

* Add missing require

* Add explanation to README

README.md

@@ -69,6 +69,8 @@ If the argument is a path to a non-writeable file, Peastash will attempt to dele
 Peastash can easily be extended to output to any target.
 Simply configure Peastash's output with an object that responds to the ``#dump`` method. This method will be called at the end of the ``#log`` block, with 1 argument: a ``LogStash::Event`` object that you will probably need to serialize to json.
 
+In case the directory doesn't exist, peastash won't crash, a tempfile will be created in /tmp (or $TMPDIR) and the data will be stored in this file. The full path of this tempfile will be printed to STDERR so it can easily be retrieved.
+
 ### What if I want to use it in my rack app?
 
 There's a middleware for that! Simply add the following somewhere:

lib/peastash/log_device.rb

@@ -10,6 +10,11 @@ def open_logfile(filename)
       STDERR.puts "[#{Time.now}][#{Process.pid}] Could not open #{filename} for writing, recreating it. Info: #{stat_data.inspect}"
       FileUtils.rm(filename)
       create_logfile(filename)
+    rescue Errno::ENOENT => e
+      require 'tempfile'
+      temp_file = Tempfile.new([filename, '.log'])
+      STDERR.puts "[#{Time.now}][#{Process.pid}] Could not open #{filename} for writing: #{e.message}. Data will be writen in: #{temp_file.path}"
+      open_logfile(temp_file.path)
     end
   end
 end