Attributable errors #8291
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Attributable errors #8291
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Adding the optional TLVs to update_fail_htlc and struct onionreply so that we can parse and store it. Key Changes: - Add tlvtype 'attribution_data' to 'update_fail_htlc' msgtype. - Add 'htlc_hold_time' & 'truncated_hmac' to struct onionreply.
We initialise time of creating htlc_out and calculate the time when this htlc_out is failed. Key Changes: - Add 'send_timestamp' to htlc_out. - Calculate hold_time when htlc_out is failed.
Implemented methods to wrap attribution data, update the attribution data. Key Changes: - Use 'ammagext' subkey to crypt the attr data. - Write method to add HMACs to the attr data. - Update attribution data to a given onionreply. - Write method to verify attr data to find erring node. - Use all these helpers inside unwrap_onionreply().
Sending attr data while sending update_fail_htlc and processing the attr data when received a update_fail_htlc msg. Key Changes: - Serializing updated attr data inside send_fail_or_fulfill. - Deserializing and processing the TLVs while parsing recvd update_fail_htlc msg.
Key changes: - Add test to check correct serialization and deserialization of attr data inside onionreply.
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Attributable errors: lightning/bolts#1044
Still a bit rough — needs comments, a flow polish, and maybe a cup of coffee. Hoping for an approach ACK, especially based on run-sphinx.c.
Addresses: #8153