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21fbae6df8
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>
129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
#include <assert.h>
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#include <bitcoin/script.h>
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#include <ccan/tal/str/str.h>
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#include <common/initial_channel.h>
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#include <common/initial_commit_tx.h>
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#include <common/keyset.h>
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#include <common/type_to_string.h>
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#include <inttypes.h>
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struct channel *new_initial_channel(const tal_t *ctx,
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const struct bitcoin_txid *funding_txid,
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unsigned int funding_txout,
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u64 funding_satoshis,
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u64 local_msatoshi,
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u32 feerate_per_kw,
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const struct channel_config *local,
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const struct channel_config *remote,
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const struct basepoints *local_basepoints,
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const struct basepoints *remote_basepoints,
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const struct pubkey *local_funding_pubkey,
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const struct pubkey *remote_funding_pubkey,
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enum side funder)
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{
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struct channel *channel = tal(ctx, struct channel);
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channel->funding_txid = *funding_txid;
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channel->funding_txout = funding_txout;
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if (funding_satoshis > UINT64_MAX / 1000)
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return tal_free(channel);
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channel->funding_msat = funding_satoshis * 1000;
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if (local_msatoshi > channel->funding_msat)
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return tal_free(channel);
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channel->funder = funder;
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channel->config[LOCAL] = local;
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channel->config[REMOTE] = remote;
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channel->funding_pubkey[LOCAL] = *local_funding_pubkey;
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channel->funding_pubkey[REMOTE] = *remote_funding_pubkey;
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channel->htlcs = NULL;
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channel->changes_pending[LOCAL] = channel->changes_pending[REMOTE]
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= false;
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channel->view[LOCAL].feerate_per_kw
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= channel->view[REMOTE].feerate_per_kw
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= feerate_per_kw;
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channel->view[LOCAL].owed_msat[LOCAL]
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= channel->view[REMOTE].owed_msat[LOCAL]
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= local_msatoshi;
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channel->view[REMOTE].owed_msat[REMOTE]
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= channel->view[LOCAL].owed_msat[REMOTE]
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= channel->funding_msat - local_msatoshi;
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channel->basepoints[LOCAL] = *local_basepoints;
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channel->basepoints[REMOTE] = *remote_basepoints;
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channel->commitment_number_obscurer
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= commit_number_obscurer(&channel->basepoints[funder].payment,
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&channel->basepoints[!funder].payment);
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return channel;
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}
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/* FIXME: We could cache this. */
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struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
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const u8 **wscript,
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const struct channel *channel,
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const struct pubkey *per_commitment_point,
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enum side side)
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{
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struct keyset keyset;
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/* This assumes no HTLCs! */
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assert(!channel->htlcs);
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if (!derive_keyset(per_commitment_point,
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&channel->basepoints[side].payment,
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&channel->basepoints[!side].payment,
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&channel->basepoints[side].htlc,
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&channel->basepoints[!side].htlc,
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&channel->basepoints[side].delayed_payment,
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&channel->basepoints[!side].revocation,
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&keyset))
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return NULL;
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*wscript = bitcoin_redeem_2of2(ctx,
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&channel->funding_pubkey[side],
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&channel->funding_pubkey[!side]);
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return initial_commit_tx(ctx, &channel->funding_txid,
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channel->funding_txout,
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channel->funding_msat / 1000,
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channel->funder,
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to_self_delay(channel, side),
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&keyset,
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channel->view[side].feerate_per_kw,
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dust_limit_satoshis(channel, side),
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channel->view[side].owed_msat[side],
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channel->view[side].owed_msat[!side],
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channel_reserve_msat(channel, side),
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0 ^ channel->commitment_number_obscurer,
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side);
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}
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static char *fmt_channel_view(const tal_t *ctx, const struct channel_view *view)
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{
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return tal_fmt(ctx, "{ feerate_per_kw=%"PRIu32","
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" owed_local=%"PRIu64","
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" owed_remote=%"PRIu64" }",
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view->feerate_per_kw,
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view->owed_msat[LOCAL],
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view->owed_msat[REMOTE]);
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}
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/* FIXME: This should reference HTLCs somehow. */
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static char *fmt_channel(const tal_t *ctx, const struct channel *channel)
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{
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return tal_fmt(ctx, "{ funding_msat=%"PRIu64","
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" funder=%s,"
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" local=%s,"
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" remote=%s }",
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channel->funding_msat,
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side_to_str(channel->funder),
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fmt_channel_view(ctx, &channel->view[LOCAL]),
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fmt_channel_view(ctx, &channel->view[REMOTE]));
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}
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REGISTER_TYPE_TO_STRING(channel, fmt_channel);
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