From 1a5b3487e5a38a4897a6461b3907cd6bde501e0c Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Tue, 8 Nov 2011 02:45:40 +0000
Subject: add support for the file_debug command

This was added in MogileFS 2.45
---
 lib/mogilefs/mogilefs.rb | 49 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 5 deletions(-)

(limited to 'lib/mogilefs/mogilefs.rb')

diff --git a/lib/mogilefs/mogilefs.rb b/lib/mogilefs/mogilefs.rb
index ef01f5b..bbf8740 100644
--- a/lib/mogilefs/mogilefs.rb
+++ b/lib/mogilefs/mogilefs.rb
@@ -219,12 +219,13 @@ class MogileFS::MogileFS < MogileFS::Client
     [ keys, res['next_after'] ]
   end
 
-  # Used to return metadata about a file. Returns the domain, class, expected
-  # length, devcount, etc. Optionally device ids (not paths) can be returned as
-  # well if :devices is specified.
+  # Return metadata about a file as a hash.
+  # Returns the domain, class, expected length, devcount, etc.
+  # Optionally device ids (not paths) can be returned as
+  # well if :devices is specified and +true+.
   #
-  # Should be used for informational purposes, and not usually for dynamically
-  # serving files.
+  # This should only be used for informational purposes, and not usually
+  # for dynamically serving files.
   def file_info(key, args = nil)
     opts = { :domain => @domain, :key => key }
     args and devices = args[:devices] and opts[:devices] = devices ? 1 : 0
@@ -233,4 +234,42 @@ class MogileFS::MogileFS < MogileFS::Client
     devids = rv["devids"] and rv["devids"] = devids.split(/,/).map! { |x| x.to_i }
     rv
   end
+
+  # Given an Integer +fid+ or String +key+ and domain, thorougly search
+  # the database for all occurences of a particular fid.
+  #
+  # Use this sparingly, this command hits the master database numerous
+  # times and is very expensive.  This is not for production use, only
+  # troubleshooting and debugging.
+  #
+  # Searches for fid=666:
+  #
+  #   client.file_debug(666)
+  #
+  # Search for key=foo using the default domain for this object:
+  #
+  #   client.file_debug("foo")
+  #
+  # Search for key=foo in domain="bar":
+  #
+  #   client.file_debug(:key => "foo", :domain => "bar")
+  #
+  def file_debug(args)
+    case args
+    when Integer then args = { "fid" => args }
+    when String then args = { "key" => args }
+    end
+    opts = { :domain => args[:domain] || @domain }.merge!(args)
+
+    rv = @backend.file_debug(opts)
+    rv.each do |k,v|
+      case k
+      when /_(?:classid|devcount|dmid|fid|length|
+            nexttry|fromdevid|failcount|flags|devid|type)\z/x
+        rv[k] = v.to_i
+      when /devids\z/
+        rv[k] = v.split(/,/).map! { |x| x.to_i }
+      end
+    end
+  end
 end
-- 
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