old_contents: #!/usr/bin/env python
  
    # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  
    #     http://www.apache.org/licenses/LICENSE-2.0
  
    # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import sys
  import gv
  import json
  from json import JSONDecoder
  from datetime import datetime
  from pygraph.classes.graph import graph
  from pygraph.classes.digraph import digraph
  from pygraph.readwrite.dot import write
  from collections import defaultdict
  
  ROOT_SPAN_ID = 0x74ace
  
  def buildGraph(nid):
    for child in spansByParent[nid]:
      gr.add_node(child, [("label", spansBySpanId[child]["Description"] + "(" + str(spansBySpanId[child]["Stop"] - spansBySpanId[child]["Start"]) +  ")")])
      gr.add_edge((nid, child))
      buildGraph(child)
  
  def loads_invalid_obj_list(s):
    decoder = JSONDecoder()
    s_len = len(s)
    objs = []
    end = 0
    while end != s_len:
      obj, end = decoder.raw_decode(s, idx=end)
      objs.append(obj)
    return objs
  
  nodes = loads_invalid_obj_list(sys.stdin.read().strip())
  spansBySpanId = {s["SpanID"]:s for s in nodes}
  spansByParent = defaultdict(set)
  
  for node in spansBySpanId.values():
    spansByParent[node["ParentID"]].add(node["SpanID"])
  
  count = 0
  for x in spansByParent[ROOT_SPAN_ID]:
    count += 1
    gr = digraph()
    gr.add_node(x, [("label", spansBySpanId[x]["Description"] + "(" + str(spansBySpanId[x]["Stop"] - spansBySpanId[x]["Start"]) +  ")")])
    buildGraph(x)
    dot = write(gr)
    gvv = gv.readstring(dot)
    gv.layout(gvv,'dot')
    gv.render(gvv,'png','./graphs/' + str(datetime.now()) + str(spansBySpanId[x]["Description"])[:10] +   '.png')
  
  print("Created " + str(count)  + " images.")
  
new_contents: #!/usr/bin/env python
  
    # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  
    #     http://www.apache.org/licenses/LICENSE-2.0
  
    # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import sys
  import gv
  import json
  from json import JSONDecoder
  from datetime import datetime
  from pygraph.classes.graph import graph
  from pygraph.classes.digraph import digraph
  from pygraph.readwrite.dot import write
  from collections import defaultdict
  
  ROOT_SPAN_ID = 0x74ace
  
  def buildGraph(nid):
    for child in spansByParent[nid]:
      desc = spansBySpanId[child]["Description"] + "(" + str(spansBySpanId[child]["Stop"] - spansBySpanId[child]["Start"]) +  ")"
      #graphviz can't handle '\'
      desc = desc.replace("\\", "")
      gr.add_node(child, [("label", desc)])
      gr.add_edge((nid, child))
      buildGraph(child)
  
  def loads_invalid_obj_list(s):
    decoder = JSONDecoder()
    s_len = len(s)
    objs = []
    end = 0
    while end != s_len:
      obj, end = decoder.raw_decode(s, idx=end)
      objs.append(obj)
    return objs
  
  nodes = loads_invalid_obj_list(sys.stdin.read().strip())
  spansBySpanId = {s["SpanID"]:s for s in nodes}
  spansByParent = defaultdict(set)
  
  for node in spansBySpanId.values():
    spansByParent[node["ParentID"]].add(node["SpanID"])
  
  count = 0
  for x in spansByParent[ROOT_SPAN_ID]:
    count += 1
    gr = digraph()
    gr.add_node(x, [("label", spansBySpanId[x]["Description"] + "(" + str(spansBySpanId[x]["Stop"] - spansBySpanId[x]["Start"]) +  ")")])
    buildGraph(x)
    dot = write(gr)
    gvv = gv.readstring(dot)
    gv.layout(gvv,'dot')
    gv.render(gvv,'png','./graphs/' + str(datetime.now()) + str(spansBySpanId[x]["Description"])[:10] +   '.png')
  
  print("Created " + str(count)  + " images.")
  
subject: fix to deal with graphviz id problems (can't handle \)