Recently, I start to study on the BGP and find that BGPStream is just what I need. Because retrieving data from collectors is time-consuming, I was going to filter all the prefixes I need in one pass using multiple conditions in the filter string. But some errors were raised in my first attempt.
After reading the documents and source code, I find multiple conditions are supported for those terms with * in the BGPReader document. And stream.add_filter() in pybgpstream achieves similar results.
So may I ask is there any plan to update bgpstream_filter_parser to support terms appearing more than once? Do I miss somewhere in the documents that indicate this inconsistency? Thank you very much!
-Siwei
Here is how I reproduce the issue.
macOS 10.15.4
Python 3.7.4
libbgpstream 2.0.0-rc4
pybgpstream 2.0.0
Using the same term mutiple times in the filter string will raise error when parsing.
stream = pybgpstream.BGPStream(
from_time="2017-07-07 00:00:00", until_time="2017-07-07 00:10:00 UTC",
collectors=["route-views.sg", "route-views.eqix"],
record_type="updates",
filter="prefix more 210.118.0.0/16 and prefix more 210.180.0.0/16"
)
for elem in stream:
print(elem)
2020-04-28 19:17:30 2005: bgpstream_filter_parser.c:165: ERROR: Term 'prefix' used more than once
...
ValueError: Invalid filter string: prefix more 210.118.0.0/16 and prefix more 210.180.0.0/16
But add_filter() does support multiple filters on the same term.
Hi CAIDA team,
Recently, I start to study on the BGP and find that BGPStream is just what I need. Because retrieving data from collectors is time-consuming, I was going to filter all the prefixes I need in one pass using multiple conditions in the filter string. But some errors were raised in my first attempt.
After reading the documents and source code, I find multiple conditions are supported for those terms with * in the BGPReader document. And
stream.add_filter()in pybgpstream achieves similar results.So may I ask is there any plan to update bgpstream_filter_parser to support terms appearing more than once? Do I miss somewhere in the documents that indicate this inconsistency? Thank you very much!
-Siwei
Here is how I reproduce the issue. macOS 10.15.4 Python 3.7.4 libbgpstream 2.0.0-rc4 pybgpstream 2.0.0
Using the same term mutiple times in the filter string will raise error when parsing.
But
add_filter()does support multiple filters on the same term.