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Add the ability to hold HTLCs before forwarding (FEAT 52/53) #989

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Add the ability to hold HTLCs before forwarding (FEAT 52/53) #989

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Commits on May 13, 2022

  1. Add an init/node feature for HTLC holding

    @TheBlueMatt
    TheBlueMatt committed May 13, 2022
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  2. Add the ability to hold HTLCs before forwarding 

    This is an incredibly simple first start towards the protocol
sketched out at [1]. It adds the ability to have a counteraprty
hold an HTLC before forwarding it.

Specifically, the HTLC sender sets a required TLV on the
`update_add_htlc` message and sends an onion message to the final
recipient. From there, the final recipient uses the included
`reply_path` to notify the sender's counterparty that they're
online and ready to receive the HTLC.

In order to fully flesh out the protocol as sketched, we'll need
to add an onion message mailbox service (which should be as simple
as a new feature bit), add PTLCs, and extensions to BOLT 12 to
allow signaling that the final recipient is often-offline. While
we could add such signaling to BOLT 11, there's not a whole lot of
reason to - if the recipient is able to provide an invoice,
they're currently online!

[1] https://lists.linuxfoundation.org/pipermail/lightning-dev/2021-October/003307.html
    @TheBlueMatt
    TheBlueMatt committed May 13, 2022
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