[tor-dev] use tor controller to detect circuit/path change

[esolve esolve]

Hi, I'm new to Tor controller,

Tor client usually open 3 circuits, one for current use and the other 2 for
standby.

Tor will change the current circuit/path in use from time to time,
depending on the network load dynamics

I'm wondering whether it is possible to use Tor controller to detect when
the circuit/path in use is changed
and obtain the list of IP addresses of those relay nodes.

thanks!
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