Function serialize_payload_final_tlv

tests/utils.py:648–667

Encode TLV onion payload for final hop, returns bytes

(amount_msat, delay, total_msat, blockheight, payment_secret: str)

def serialize_payload_final_tlv(amount_msat, delay, total_msat, blockheight, payment_secret: str):
    """Encode TLV onion payload for final hop, returns bytes"""
    payload = TlvPayload()
    # BOLT #4:
    #     1. type: 2 (`amt_to_forward`)
    #     2. data:
    #         * [`tu64`:`amt_to_forward`]
    payload.add_field(2, tu64_encode(int(amount_msat)))
    # BOLT #4:
    #    1. type: 4 (`outgoing_cltv_value`)
    #    2. data:
    #        * [`tu32`:`outgoing_cltv_value`]
    payload.add_field(4, tu64_encode(blockheight + delay))
    # BOLT #4:
    #    1. type: 8 (`payment_data`)
    #    2. data:
    #        * [`32*byte`:`payment_secret`]
    #        * [`tu64`:`total_msat`]
    payload.add_field(8, bytes.fromhex(payment_secret) + tu64_encode(int(total_msat)))
    return payload.to_bytes()


# I wish we could force libwally to use different entropy and thus force it to