Find non existent referenced objects in osm osc change file

checkosc.py

from pyo5m import OsmData
import requests

if __name__=="__main__":
	#
	osc = OsmData.OsmChange()
	osc.LoadFromOscXml(open("bad_changeset.osc", "rb"))
	
	refNodes, refWays, refRelations = set(), set(), set()

	for n in osc.create.nodes:
		pass
	for w in osc.create.ways:
		for cn in w[3]:
			refWays.add(cn)
	for r in osc.create.relations:
		for objType, objId, objRole in r[3]:
			if objType == "node":
				 refNodes.add(objId)
			elif objType == "way":
				 refWays.add(objId)
			elif objType == "relation":
				 refRelations.add(objId)

	for n in osc.modify.nodes:
		refNodes.add(n[0])
	for w in osc.modify.ways:
		refWays.add(w[0])
		for cn in w[3]:
			refNodes.add(cn)
	for r in osc.modify.relations:
		refRelations.add(r[0])
		for objType, objId, objRole in r[3]:
			if objType == "node":
				 refNodes.add(objId)
			elif objType == "way":
				 refWays.add(objId)
			elif objType == "relation":
				 refRelations.add(objId)

	for n in osc.delete.nodes:
		refNodes.add(n[0])
	for w in osc.delete.ways:
		refWays.add(w[0])
		for cn in w[3]:
			refNodes.add(cn)
	for r in osc.delete.relations:
		refRelations.add(r[0])
		for objType, objId, objRole in r[3]:
			if objType == "node":
				 refNodes.add(objId)
			elif objType == "way":
				 refWays.add(objId)
			elif objType == "relation":
				 refRelations.add(objId)

	print (len(refNodes))
	print (len(refWays))
	print (len(refRelations))

	#for n in refNodes:
	#	if n < 0:
	#		continue
	#	req = requests.get('http://api.fosm.org/api/0.6/node/{}'.format(n))
	#	print ("n", n, req.status_code)
	
	for w in refWays:
		if w < 0:
			continue
		req = requests.get('http://api.fosm.org/api/0.6/way/{}'.format(w))
		print ("w", w, req.status_code)

	for r in refRelations:
		if r < 0:
			continue
		req = requests.get('http://api.fosm.org/api/0.6/relation/{}'.format(r))
		print ("r", r, req.status_code)