145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
#include <assert.h>
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#include <bitcoin/chainparams.h>
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#include <bitcoin/script.h>
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#include <ccan/array_size/array_size.h>
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#include <ccan/cast/cast.h>
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#include <ccan/tal/str/str.h>
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#include <common/fee_states.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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u32 minimum_depth,
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struct amount_sat funding,
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struct amount_msat local_msatoshi,
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const struct fee_states *fee_states TAKES,
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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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bool option_static_remotekey,
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enum side opener)
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{
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struct channel *channel = tal(ctx, struct channel);
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struct amount_msat remote_msatoshi;
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channel->funding_txid = *funding_txid;
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channel->funding_txout = funding_txout;
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channel->funding = funding;
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channel->minimum_depth = minimum_depth;
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if (!amount_sat_sub_msat(&remote_msatoshi,
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channel->funding, local_msatoshi))
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return tal_free(channel);
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channel->opener = opener;
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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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/* takes() if necessary */
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channel->fee_states = dup_fee_states(channel, fee_states);
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channel->view[LOCAL].owed[LOCAL]
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= channel->view[REMOTE].owed[LOCAL]
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= local_msatoshi;
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channel->view[REMOTE].owed[REMOTE]
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= channel->view[LOCAL].owed[REMOTE]
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= remote_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[opener].payment,
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&channel->basepoints[!opener].payment);
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channel->option_static_remotekey = option_static_remotekey;
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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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struct wally_tx_output *direct_outputs[NUM_SIDES],
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char** err_reason)
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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],
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&channel->basepoints[!side],
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channel->option_static_remotekey,
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&keyset)) {
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*err_reason = "Cannot derive keyset";
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return NULL;
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}
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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,
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&channel->funding_txid,
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channel->funding_txout,
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channel->funding,
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cast_const(u8 *, *wscript),
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channel->opener,
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/* They specify our to_self_delay and v.v. */
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channel->config[!side].to_self_delay,
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&keyset,
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channel_feerate(channel, side),
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channel->config[side].dust_limit,
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channel->view[side].owed[side],
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channel->view[side].owed[!side],
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channel->config[!side].channel_reserve,
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0 ^ channel->commitment_number_obscurer,
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direct_outputs,
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side,
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err_reason);
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}
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u32 channel_feerate(const struct channel *channel, enum side side)
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{
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return get_feerate(channel->fee_states, channel->opener, 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, "{ owed_local=%s,"
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" owed_remote=%s }",
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type_to_string(tmpctx, struct amount_msat,
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&view->owed[LOCAL]),
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type_to_string(tmpctx, struct amount_msat,
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&view->owed[REMOTE]));
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}
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/* FIXME: This should reference HTLCs somehow, and feerates! */
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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=%s,"
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" opener=%s,"
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" local=%s,"
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" remote=%s }",
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type_to_string(tmpctx, struct amount_sat,
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&channel->funding),
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side_to_str(channel->opener),
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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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