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lightningd: don't let them fundpsbt below emergency reserve.

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This is the simple version which always tries to keep some sats if we
have an anchor channel.  Turns out that we need something more
sophisticated for multifundchannel, so that's next.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Changed: JSON-RPC: `withdraw` will refuse to spend funds below `min-emergency-msat` if we have any anchor channels (and `all` will be reduced appropriately).
Changelog-Changed: JSON-RPC: `fundpsbt` and `utxopsbt` will refuse to spend funds below `min-emergency-msat` if we have any anchor channels.
This commit is contained in:
Rusty Russell
2023-06-29 09:44:10 +09:30
parent 75aca3cbb6
commit 391da2f440
10 changed files with 221 additions and 15 deletions
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common/jsonrpc_errors.h
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@@ -63,6 +63,7 @@ enum jsonrpc_errcode {
FUNDING_V2_NOT_SUPPORTED = 310,
FUNDING_UNKNOWN_CHANNEL = 311,
FUNDING_STATE_INVALID = 312,
FUND_CANNOT_AFFORD_WITH_EMERGENCY = 313,
/* `connect` errors */
CONNECT_NO_KNOWN_ADDRESS = 400,