add role command doc

cmd/ledis-cli/const.go

@@ -1,4 +1,4 @@
-//This file was generated by .tools/generate_commands.py on Sat Jan 24 2015 10:59:30 +0800 
+//This file was generated by .tools/generate_commands.py on Tue Feb 03 2015 14:21:53 +0800 
 package main
 
 var helpCommands = [][]string{
@@ -77,6 +77,7 @@ var helpCommands = [][]string{
 	{"PERSIST", "key", "KV"},
 	{"PING", "-", "Server"},
 	{"RESTORE", "key ttl value", "Server"},
+	{"ROLE", "-", "Server"},
 	{"ROLLBACK", "-", "Transaction"},
 	{"RPOP", "key", "List"},
 	{"RPUSH", "key value [value ...]", "List"},

doc/commands.json

@@ -788,5 +788,11 @@
         "arguments" : "key ttl value",
         "group" : "Server",
         "readonly" : false
+    },
+
+    "ROLE": {
+        "arguments" : "-",
+        "group" : "Server",
+        "readonly" : true
     }
 }

doc/commands.md

@@ -159,6 +159,7 @@ Table of Contents
 	- [TIME](#time)
 	- [CONFIG REWRITE](#config-rewrite)
 	- [RESTORE key ttl value](#restore-key-ttl-value)
+	- [ROLE](#role)
 - [Transaction](#transaction)
 	- [BEGIN](#begin)
 	- [ROLLBACK](#rollback)
@@ -2838,6 +2839,45 @@ If ttl is 0 the key is created without any expire, otherwise the specified expir
 
 RESTORE checks the RDB version and data checksum. If they don't match an error is returned.
 
+### ROLE
+
+Provide information on the role of an intance in the context of replication. 
+
+Role: master and slave
+
+Master output:
+
+```
+1) "master"
+2) (integer) 3129659
+3) 1) 1) "127.0.0.1"
+      2) "9001"
+      3) "3129242"
+   2) 1) "127.0.0.1"
+      2) "9002"
+      3) "3129543"
+```
+
+1. The string master.
+2. The current master replication binlog last log id.
+3. An array about the slaves, each sub array contains slave IP, port, and the last acknowledged replication binlog id. 
+
+Slave output:
+
+```
+1) "slave"
+2) "127.0.0.1"
+3) (integer) 9000
+4) "connected"
+5) (integer) 3167038
+```
+
+1. The string slave
+2. The slave IP
+3. The slave port
+4. The slave replication state, includes connect, connecting, sync and connected.
+5. The slave current replication binlog id.
+
 ## Transaction
 
 ### BEGIN