redis-sha1 utility added

utils/redis-sha1.rb

@@ -0,0 +1,32 @@
+# redis-sha1.rb - Copyright (C) 2009 Salvatore Sanfilippo
+# BSD license, See the COPYING file for more information.
+#
+# Performs the SHA1 sum of the whole datset.
+# This is useful to spot bugs in persistence related code and to make sure
+# Slaves and Masters are in SYNC.
+#
+# If you hack this code make sure to sort keys and set elements as this are
+# unsorted elements. Otherwise the sum may differ with equal dataset.
+
+require 'rubygems'
+require 'redis'
+require 'digest/sha1'
+
+def redisSha1(opts={})
+    sha1=""
+    r = Redis.new(opts)
+    r.keys('*').sort.each{|k|
+        sha1 = Digest::SHA1.hexdigest(sha1+k)
+        vtype = r.type?(k)
+        if vtype == "string"
+            sha1 = Digest::SHA1.hexdigest(sha1+r.get(k))
+        elsif vtype == "list"
+            sha1 = Digest::SHA1.hexdigest(sha1+r.list_range(k,0,-1).join("\x01"))
+        elsif vtype == "set"
+            sha1 = Digest::SHA1.hexdigest(sha1+r.set_members(k).to_a.sort.join("\x02"))
+        end
+    }
+    sha1
+end
+
+p "Dataset SHA1: #{redisSha1()}"