Deterministic daemons: CLN_DEV_SET_TIME and CLN_DEV_ENTROPY_SEED #8556
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rustyrussell
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…LN_DEV_ENTROPY_SEED Only in developer mode, ofc. Notes: 1. We have to move the initialization before the lightningd main trace_start, since that uses pseudorand(). 2. To make the results stable, we need to use per-caller values to randbytes(). Otherwise external timing changes the call order. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This allows us to override it for deterministic results. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
…tion for timeouts. This is immune to things like clock changes, and has the convenient side-effect that it will *not* be overridden when we override time for developer purposes. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Except for tracing, that sticks with time_now(). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
…ith CLN_DEV_ENTROPY_SEED. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
…istincoming. This ensures that bolt11/bolt12 selection of routehints/blinded paths is always the same. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
…itialblockdownload. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We have to add a send_and_mine_block() for cases where we want to get a txid and then mine it (for canned blocks, we mine it then figure out which tx it was!). And fix up out-by-one in saving blocks. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Depends on #8555
This attempts to make our behavior deterministic, and robust against changes, so we can generate repeatable examples. This is not entirely successful: when we interact with other daemons, timing can be an issue (such as multifundchannel), but it works in a limited way.
Changelog-None: development stuff only