Merge branch 'unstable' of github.com:antirez/redis into unstable

[redis.git] / src / redis-trib.rb

diff --git a/src/redis-trib.rb b/src/redis-trib.rb
index cd35587fe7779e41d6d38d2313f63539dd448b1c..31fc5230550852a5fe6848d2b0c9064990b4cdc0 100755 (executable)
--- a/src/redis-trib.rb
+++ b/src/redis-trib.rb
@@ -14,9 +14,10 @@ class ClusterNode
     def initialize(addr)
         s = addr.split(":")
         if s.length != 2
-            puts "Invalid node name #{node}"
+            puts "Invalid node name #{addr}"
             exit 1
         end
+        @r = nil
         @host = s[0]
         @port = s[1]
         @slots = {}
@@ -27,14 +28,16 @@ class ClusterNode
         "#{@host}:#{@port}"
     end
 
-    def connect
+    def connect(o={})
         xputs "Connecting to node #{self}: "
         begin
-            @r = Redis.new(:host => @ost, :port => @port)
+            @r = Redis.new(:host => @host, :port => @port)
             @r.ping
         rescue
             puts "ERROR"
             puts "Sorry, can't connect to node #{self}"
+            exit 1 if o[:abort]
+            @r = nil
         end
         puts "OK"
     end
@@ -75,20 +78,49 @@ class ClusterNode
         @dirty = false
     end
 
-    def info
-        slots = @slots.map{|k,v| k}.reduce{|a,b|
-            a = [(a..a)] if !a.is_a?(Array)
-            if b == (a[-1].last)+1
-                a[-1] = (a[-1].first)..b
-                a
+    def info_string
+        # We want to display the hash slots assigned to this node
+        # as ranges, like in: "1-5,8-9,20-25,30"
+        #
+        # Note: this could be easily written without side effects,
+        # we use 'slots' just to split the computation into steps.
+        
+        # First step: we want an increasing array of integers
+        # for instance: [1,2,3,4,5,8,9,20,21,22,23,24,25,30]
+        slots = @slots.keys.sort
+
+        # As we want to aggregate adiacent slots we convert all the
+        # slot integers into ranges (with just one element)
+        # So we have something like [1..1,2..2, ... and so forth.
+        slots.map!{|x| x..x}
+
+        # Finally we group ranges with adiacent elements.
+        slots = slots.reduce([]) {|a,b|
+            if !a.empty? && b.first == (a[-1].last)+1
+                a[0..-2] + [(a[-1].first)..(b.last)]
             else
-                a << (b..b)
+                a + [b]
             end
-        }.map{|x|
-            (x.first == x.last) ? x.first.to_s : "#{x.first}-#{x.last}"
+        }
+
+        # Now our task is easy, we just convert ranges with just one
+        # element into a number, and a real range into a start-end format.
+        # Finally we join the array using the comma as separator.
+        slots = slots.map{|x|
+            x.count == 1 ? x.first.to_s : "#{x.first}-#{x.last}"
         }.join(",")
+
         "#{self.to_s.ljust(25)} slots:#{slots}"
     end
+
+    def info
+        {
+            :host => @host,
+            :port => @port,
+            :slots => @slots,
+            :dirty => @dirty
+        }
+    end
     
     def is_dirty?
         @dirty
@@ -112,23 +144,13 @@ class RedisTrib
         end
     end
 
-    def create_cluster
-        puts "Creating cluster"
-        ARGV[1..-1].each{|n|
-            node = ClusterNode.new(n)
-            node.connect
-            node.assert_cluster
-            node.assert_empty
-            @nodes << node
-        }
-        puts "Performing hash slots allocation on #{@nodes.length} nodes..."
-        alloc_slots
+    def add_node(node)
+        @nodes << node
+    end
+
+    def check_cluster
+        puts "Performing Cluster Check (using node #{@nodes[0]})"
         show_nodes
-        yes_or_die "Can I set the above configuration?"
-        flush_nodes_config
-        puts "** Nodes configuration updated"
-        puts "Sending CLUSTER MEET messages to join the cluster"
-        join_cluster
     end
 
     def alloc_slots
@@ -151,11 +173,21 @@ class RedisTrib
 
     def show_nodes
         @nodes.each{|n|
-            puts n.info
+            puts n.info_string
         }
     end
 
     def join_cluster
+        # We use a brute force approach to make sure the node will meet
+        # each other, that is, sending CLUSTER MEET messages to all the nodes
+        # about the very same node.
+        # Thanks to gossip this information should propagate across all the
+        # cluster in a matter of seconds.
+        first = false
+        @nodes.each{|n|
+            if !first then first = n.info; next; end # Skip the first node
+            n.r.cluster("meet",first[:host],first[:port])
+        }
     end
 
     def yes_or_die(msg)
@@ -166,10 +198,41 @@ class RedisTrib
             exit 1
         end
     end
+
+    # redis-trib subcommands implementations
+
+    def check_cluster_cmd
+        node = ClusterNode.new(ARGV[1])
+        node.connect(:abort => true)
+        node.assert_cluster
+        add_node(node)
+        check_cluster
+    end
+
+    def create_cluster_cmd
+        puts "Creating cluster"
+        ARGV[1..-1].each{|n|
+            node = ClusterNode.new(n)
+            node.connect(:abort => true)
+            node.assert_cluster
+            node.assert_empty
+            add_node(node)
+        }
+        puts "Performing hash slots allocation on #{@nodes.length} nodes..."
+        alloc_slots
+        show_nodes
+        yes_or_die "Can I set the above configuration?"
+        flush_nodes_config
+        puts "** Nodes configuration updated"
+        puts "** Sending CLUSTER MEET messages to join the cluster"
+        join_cluster
+        check_cluster
+    end
 end
 
 COMMANDS={
-    "create-cluster" => ["create_cluster", -2, "node1_addr node2_addr ..."]
+    "create" => ["create_cluster_cmd", -2, "host1:port host2:port ... hostN:port"],
+    "check" =>  ["check_cluster_cmd", 2, "host:port"]
 }
 
 # Sanity check