support detailed stats

lib/dalli/client.rb

@@ -274,11 +274,13 @@ def touch(key, ttl=nil)
 
     ##
     # Collect the stats for each server.
+    # You can optionaly pass a type including :items or :slabs to get specific stats
     # Returns a hash like { 'hostname:port' => { 'stat1' => 'value1', ... }, 'hostname2:port' => { ... } }
-    def stats
+    def stats(type=nil)
+      type = nil if ![nil, :items,:slabs].include? type
       values = {}
       ring.servers.each do |server|
-        values["#{server.hostname}:#{server.port}"] = server.alive? ? server.request(:stats) : nil
+        values["#{server.hostname}:#{server.port}"] = server.alive? ? server.request(:stats,type.to_s) : nil
       end
       values
     end

test/test_dalli.rb

@@ -115,6 +115,18 @@
           stats[s]["get_hits"].to_i != 0
         end)
 
+        stats_items = dc.stats(:items)
+        servers = stats_items.keys
+        assert(servers.any? do |s|
+          stats_items[s].keys[0] =~ /items:[0-9]+:number/
+        end)
+
+        stats_slabs = dc.stats(:slabs)
+        servers = stats_slabs.keys
+        assert(servers.any? do |s|
+          stats_slabs[s].keys[0] =~ /[0-9]+:chunk_size/
+        end)
+
         # reset_stats test
         results = dc.reset_stats
         assert(results.all? { |x| x })