Cannot print timestamp from mongodb oplog using pymongo - mongodb

Question

I have the following code:
connection = MongoClient('core.mongo.com', 27017)
db = connection['admin']
first = db.oplog.rs.find().sort('$natural', pymongo.DESCENDING).limit(-1).next()
ts = first['ts']
while True:
cursor = db.oplog.find({'ts': {'$gt': ts}}, tailable=True, await_data=True)
while cursor.alive:
for doc in cursor:
ts = doc['ts']
time.sleep(1)
I get:
Traceback (most recent call last):
File "tail.py", line 25, in <module>
ts = first['ts']
File "/Library/Python/2.7/site-packages/pymongo/cursor.py", line 569, in __getitem__
"instances" % index)
TypeError: index 'ts' cannot be applied to Cursor instances
How am I supposed to get the latest time-stamp from the oplog of the mongo database?

Answer 1

Following code gives me the last operation on database_name.collection_name:
connection = MongoClient('core.mongo.com', 27017)
db = connection['admin']
oplog_str = str(connection.local.oplog.rs)
print oplog_str
new_query = {'ns': {'$in': ['database_name.collection_name']}}
curr = connection.local.oplog.rs.find(new_query).sort('$natural', pymongo.DESCENDING).limit(-1)
for doc_count, doc in enumerate(curr):
current_time_stamp = doc['ts'].time
good_date = datetime.datetime.fromtimestamp(current_time_stamp).ctime()
print doc_count, good_date
If you want the operation irrespective of the database and collection, just remove new_query from curr.