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openingd: ensure that initial channel can cover fees and reserve.

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This is probably covered by our "channel capacity" heuristic which
requires the channel be significant, but best to be explicit and sure.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-03-18 15:11:32 +10:30
committed by Christian Decker
parent 441a5b8835
commit 21fbae6df8
6 changed files with 70 additions and 8 deletions
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5
common/initial_commit_tx.h
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@@ -76,11 +76,12 @@ struct bitcoin_tx *initial_commit_tx(const tal_t *ctx,
u64 dust_limit_satoshis,
u64 self_pay_msat,
u64 other_pay_msat,
u64 self_reserve_msat,
u64 obscured_commitment_number,
enum side side);
/* try_subtract_fee - take away this fee from the funder, or all if insufficient. */
void try_subtract_fee(enum side funder, enum side side,
/* try_subtract_fee - take away this fee from the funder (and return true), or all if insufficient (and return false). */
bool try_subtract_fee(enum side funder, enum side side,
u64 base_fee_msat, u64 *self_msat, u64 *other_msat);
/* Generate the witness script for the to-self output: