Cluster test: basic cluster nodes info access functions.

tests/cluster/cluster.tcl

@@ -4,4 +4,41 @@
 # This softare is released under the BSD License. See the COPYING file for
 # more information.
 
+# Returns a parsed CLUSTER NODES output as a list of dictionaries.
+proc get_cluster_nodes id {
+    set lines [split [R $id cluster nodes] "\r\n"]
+    set nodes {}
+    foreach l $lines {
+        set l [string trim $l]
+        if {$l eq {}} continue
+        set args [split $l]
+        set node [dict create \
+            id [lindex $args 0] \
+            addr [lindex $args 1] \
+            flags [split [lindex $args 2] ,] \
+            slaveof [lindex $args 3] \
+            ping_sent [lindex $args 4] \
+            pong_recv [lindex $args 5] \
+            config_epoch [lindex $args 6] \
+            linkstate [lindex $args 7] \
+            slots [lrange $args 8 -1] \
+        ]
+        lappend nodes $node
+    }
+    return $nodes
+}
+
+# Test node for flag.
+proc has_flag {node flag} {
+    expr {[lsearch -exact [dict get $node flags] $flag] != -1}
+}
+
+# Returns the parsed myself node entry as a dictionary.
+proc get_myself id {
+    set nodes [get_cluster_nodes $id]
+    foreach n $nodes {
+        if {[has_flag $n myself]} {return $n}
+    }
+    return {}
+}