[7.6.1] object of type 'NoneType' has no len()

[kozlovsky]

This issue affects multiple users in 7.6.1 release. As I understand it, the error happens in ipv8.messaging.anonymization.hidden_services:

    def create_e2e(self, info_hash, intro_point):
        circuit = self.select_circuit_for_infohash(info_hash)
        if not circuit:
            self.logger.error("No circuit for contacting the introduction point")
            return

        hop = Hop(Peer(LibNaCLPK(intro_point.seeder_pk[10:])))
        ...

As I understand it, in the last line intro_point.seeder_pk is an empty byte string for some reason, and as a result, LibNaCLPK constructor receives b'' as an argument, and the pk value inside LibNaCLPK.__init__() becomes None.

[sentry-for-tribler]

Sentry issue: SENTRY-FOR-760-W

[sentry-for-tribler]

Sentry issue: TRIBLER-45

[egbertbouman]

This is probably due to a serialization issue. The error shows up if the last byte of the public key of the introduction point is 0x00. I fixed this in IPv8. As soon as the pointer is updated, this issue can be closed.

[egbertbouman]

Note that even though this issue is fixed, the error will continue to show up since the exit nodes are still running the old code.