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Intercept HTLC forwards for JIT channels #1835

Merged
merged 9 commits into from
Dec 1, 2022
Merged

Intercept HTLC forwards for JIT channels #1835

merged 9 commits into from
Dec 1, 2022

Commits on Nov 30, 2022

  1. Persist pending intercepted htlcs in ChannelManager 

    No htlcs are intercepted yet, that will be added in upcoming commit(s)

Co-authored-by: John Cantrell <[email protected]>
Co-authored-by: Valentine Wallace <[email protected]>
    @valentinewallace @johncantrell97
    valentinewallace and johncantrell97 committed Nov 30, 2022
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  2. Add fake scid namespace for intercepted HTLCs 

    This is useful for LSPs who wish to create a just-in-time channel for end users
receiving a lightning payment. These fake scids will be encoded into route
hints in end user invoices, and signal to LDK to create an event triggering the
JIT channel, after which the payment will be received.

Co-authored-by: John Cantrell <[email protected]>
Co-authored-by: Valentine Wallace <[email protected]>
    @valentinewallace @johncantrell97
    valentinewallace and johncantrell97 committed Nov 30, 2022
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  3. Add HTLCIntercepted event 

    Used in upcoming commit(s) so users can intercept forwarded HTLCs

Co-authored-by: John Cantrell <[email protected]>
Co-authored-by: Valentine Wallace <[email protected]>
    @valentinewallace @johncantrell97
    valentinewallace and johncantrell97 committed Nov 30, 2022
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  4. Generate HTLCIntercepted event upon interceptable forward 

    And store the pending intercepted HTLC in pending_intercepted_htlcs

Co-authored-by: John Cantrell <[email protected]>
Co-authored-by: Valentine Wallace <[email protected]>
    @valentinewallace @johncantrell97
    valentinewallace and johncantrell97 committed Nov 30, 2022
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  5. Utils for forwarding intercepted htlcs + getting intercept scids 

    See ChannelManager::forward_intercepted_htlc and
ChannelManager::get_intercept_scid for details

Co-authored-by: John Cantrell <[email protected]>
Co-authored-by: Valentine Wallace <[email protected]>
    @valentinewallace @johncantrell97
    valentinewallace and johncantrell97 committed Nov 30, 2022
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  6. Allow failing back intercepted HTLCs 

    Co-authored-by: John Cantrell <[email protected]>
Co-authored-by: Valentine Wallace <[email protected]>
    @valentinewallace @johncantrell97
    valentinewallace and johncantrell97 committed Nov 30, 2022
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  7. Add config knob for forwarding intercept payments

    @valentinewallace
    valentinewallace committed Nov 30, 2022
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  8. Automatically fail intercepts back on timeout

    @valentinewallace
    valentinewallace committed Nov 30, 2022
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  9. Don't forward HTLC intercepts over unestablished channels

    @valentinewallace
    valentinewallace committed Nov 30, 2022
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