exract just the node id as hex

copiousfreetime · Feb 17, 2017 · 6a0d45b · 6a0d45b
1 parent 1b0f181
commit 6a0d45b
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Showing 2 changed files with 16 additions and 0 deletions.
diff --git a/lib/torid/uuid.rb b/lib/torid/uuid.rb
@@ -151,6 +151,16 @@ def to_s
       "%08x-%04x-%04x-%02x%02x-%s" % elements
     end
 
+    # Public: Return the hexidcimal UUID string representation of just the
+    # node_id. This is just the last 2 parts
+    def node_id_s
+      node_bytes = [ @node_id >> 32, @node_id & 0xFFFF_FFFF].pack("NN")
+      elements   = node_bytes.unpack("CCa6")
+      node         = elements[-1].unpack('C*')
+      elements[-1] = '%02x%02x%02x%02x%02x%02x' % node
+      "%02x%02x-%s" % elements
+    end
+
     # Public: Compare the equality of UUID's
     #
     # Examples

diff --git a/test/test_uuid.rb b/test/test_uuid.rb
@@ -10,6 +10,7 @@ def setup
       @bytes     = [ @timestamp >> 32, @timestamp & 0xFFFF_FFFF,
                      @node_id   >> 32, @node_id   & 0XFFFF_FFFF ].pack("NNNN")
       @guid      = "0004fd7d-f50d-e22e-0000-00000000002a"
+      @node_id_s = "0000-00000000002a"
     end
 
     def test_uuid_regex_matches
@@ -49,6 +50,11 @@ def test_extracts_node_id_from_bytes
       assert_equal( @node_id , uuid.node_id )
     end
 
+    def test_extracts_node_id_as_hex
+      uuid = ::Torid::UUID.from( @bytes)
+      assert_equal( @node_id_s, uuid.node_id_s )
+    end
+
     def test_round_trips_uuid_string
       uuid = ::Torid::UUID.from( @guid )
       assert_equal( uuid.to_s, uuid.to_s )