无法使用使用Google协议缓冲区的python应用程序

Question

I am trying to use an application I found on GitHub which records live updates for public transport positions, see the following link to the instructions and application:

https://github.com/mattwigway/gtfsrdb

When I modify the terminal commands to:

python gtfsrdb.py run -p https://gtfsrt.api.translink.com.au/Feed/SEQ.pb -d sqlite:///test.db -c

I get the following error:

Exception occurred in iteration
(<class 'google.protobuf.message.DecodeError'>, 
DecodeError('Unexpected end-group tag.',), 
<traceback object at 0x107d21248>)

How do I get this application to record the live feeds from https://gtfsrt.api.translink.com.au

Answer 1

You used the URL:

https://gtfsrt.api.translink.com.au/Feed/SEQ.pb

This URL doesn't exist -- it returns 404. You can see this by opening it in your browser. The script you are running is probably trying to parse the 404 page HTML as a protobuf, which of course fails.

Perhaps you meant this url:

https://gtfsrt.api.translink.com.au/Feed/SEQ

Note the lack of .pb at the end. I haven't tried gtfsrdb.py myself, but this URL appears on the site you linked and appears to return protobuf data.

Answer 2

This error appeared for me due to authentication errors. Once I fixed this, the error went away.