diff --git a/graph/graph.py b/graph/graph.py
new file mode 100644
index 0000000000..c600773412
--- /dev/null
+++ b/graph/graph.py
@@ -0,0 +1,137 @@
+
+import sqlite3
+import pydot
+import cgi
+import json
+import datetime
+import argparse
+import urllib2
+
+
+def make_name(pdu_id, origin):
+ return "%s@%s" % (pdu_id, origin)
+
+
+def make_graph(pdus, room, filename_prefix):
+ pdu_map = {}
+ node_map = {}
+
+ origins = set()
+ colors = set(("red", "green", "blue", "yellow", "purple"))
+
+ for pdu in pdus:
+ origins.add(pdu.get("origin"))
+
+ color_map = {color: color for color in colors if color in origins}
+ colors -= set(color_map.values())
+
+ color_map[None] = "black"
+
+ for o in origins:
+ if o in color_map:
+ continue
+ try:
+ c = colors.pop()
+ color_map[o] = c
+ except:
+ print "Run out of colours!"
+ color_map[o] = "black"
+
+ graph = pydot.Dot(graph_name="Test")
+
+ for pdu in pdus:
+ name = make_name(pdu.get("pdu_id"), pdu.get("origin"))
+ pdu_map[name] = pdu
+
+ t = datetime.datetime.fromtimestamp(
+ float(pdu["ts"]) / 1000
+ ).strftime('%Y-%m-%d %H:%M:%S,%f')
+
+ label = (
+ "<"
+ "<b>%(name)s </b><br/>"
+ "Type: <b>%(type)s </b><br/>"
+ "State key: <b>%(state_key)s </b><br/>"
+ "Content: <b>%(content)s </b><br/>"
+ "Time: <b>%(time)s </b><br/>"
+ "Depth: <b>%(depth)s </b><br/>"
+ ">"
+ ) % {
+ "name": name,
+ "type": pdu.get("pdu_type"),
+ "state_key": pdu.get("state_key"),
+ "content": cgi.escape(json.dumps(pdu.get("content")), quote=True),
+ "time": t,
+ "depth": pdu.get("depth"),
+ }
+
+ node = pydot.Node(
+ name=name,
+ label=label,
+ color=color_map[pdu.get("origin")]
+ )
+ node_map[name] = node
+ graph.add_node(node)
+
+ for pdu in pdus:
+ start_name = make_name(pdu.get("pdu_id"), pdu.get("origin"))
+ for i, o in pdu.get("prev_pdus", []):
+ end_name = make_name(i, o)
+
+ if end_name not in node_map:
+ print "%s not in nodes" % end_name
+ continue
+
+ edge = pydot.Edge(node_map[start_name], node_map[end_name])
+ graph.add_edge(edge)
+
+ # Add prev_state edges, if they exist
+ if pdu.get("prev_state_id") and pdu.get("prev_state_origin"):
+ prev_state_name = make_name(
+ pdu.get("prev_state_id"), pdu.get("prev_state_origin")
+ )
+
+ if prev_state_name in node_map:
+ state_edge = pydot.Edge(
+ node_map[start_name], node_map[prev_state_name],
+ style='dotted'
+ )
+ graph.add_edge(state_edge)
+
+ graph.write('%s.dot' % filename_prefix, format='raw', prog='dot')
+ graph.write_png("%s.png" % filename_prefix, prog='dot')
+ graph.write_svg("%s.svg" % filename_prefix, prog='dot')
+
+
+def get_pdus(host, room):
+ transaction = json.loads(
+ urllib2.urlopen(
+ "http://%s/context/%s/" % (host, room)
+ ).read()
+ )
+
+ return transaction["pdus"]
+
+
+if __name__ == "__main__":
+ parser = argparse.ArgumentParser(
+ description="Generate a PDU graph for a given room by talking "
+ "to the given homeserver to get the list of PDUs. \n"
+ "Requires pydot."
+ )
+ parser.add_argument(
+ "-p", "--prefix", dest="prefix",
+ help="String to prefix output files with"
+ )
+ parser.add_argument('host')
+ parser.add_argument('room')
+
+ args = parser.parse_args()
+
+ host = args.host
+ room = args.room
+ prefix = args.prefix if args.prefix else "%s_graph" % (room)
+
+ pdus = get_pdus(host, room)
+
+ make_graph(pdus, room, prefix)
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