Gossmap topology compression and helper #7495
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rustyrussell
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Rebased on master for rust regression fix |
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…map topology. Simple format, which doesn't include node information, just the channels. Example: ``` $ ls -l gossip-store-2024-06-26 -rw------- 1 rusty rusty 98815543 Jul 26 09:47 gossip-store-2024-06-26 $ ./devtools/gossmap-compress -v compress gossip-store-2024-06-26 compressed 18693 nodes 61437 channels 46148 disabled channels (32620 no update) 9690 unique capacities 85 unique htlc_min 6867 unique htlc_max 807 unique basefee 2521 unique propfee 94 unique delay $ ls -l compressed -rw-rw-r-- 1 rusty rusty 1643258 Jul 26 09:51 compressed ``` Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
…ble. Before: ``` -rw-rw-r-- 1 rusty rusty 1643258 Jul 26 09:51 compressed ``` After: ``` -rw-rw-r-- 1 rusty rusty 508332 Jul 26 09:49 compressed ``` Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We marshal it into the "compressed" format and get the decompresser to build the actual gossmap. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This helps code using generate_gossip_store() too, since it can map its identifiers to the nodeids which were used. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Trivial rebase on master. |
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I've been meaning to do this for a while: create a format for representing the gossip map topology for testing routing. My gossip store shrinks to about 500k in this format, which is something we could actually check into the repository for testing.
It also provides a nice way to create topologies for python tests.