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It is possible for prevtx to be larger than max packet size, so for shared outputs (currently only the funding tx) we add support for sending the `txid` only across the wire and filling in the prevtx locally. Changelog-None
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
#ifndef LIGHTNING_COMMON_INTERACTIVETX_H
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#define LIGHTNING_COMMON_INTERACTIVETX_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <common/channel_id.h>
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#include <common/per_peer_state.h>
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#include <common/tx_roles.h>
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#include <common/utils.h>
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#include <wally_psbt.h>
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/* Interactive tx handles the building and updating of a transaction between
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* two peers. A PSBT is passed back and forth between two peers in steps. In
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* each step a peer can suggest a single change or signal they're done
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* updating with WIRE_TX_COMPLETE. Once two steps in a row result in
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* WIRE_TX_COMPLETE the transaction is considered complete.
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*/
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#define INTERACTIVETX_NUM_TX_MSGS (TX_RM_OUTPUT + 1)
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enum tx_msgs {
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TX_ADD_INPUT,
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TX_ADD_OUTPUT,
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TX_RM_INPUT,
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TX_RM_OUTPUT,
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};
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struct interactivetx_context {
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enum tx_role our_role;
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struct per_peer_state *pps;
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struct channel_id channel_id;
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/* The existing funding outpoint of a channel being spliced.
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* This input will send funding_txid instead of prevtx. */
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struct bitcoin_outpoint *shared_outpoint;
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/* When receiving `tx_add_input` we will fill in prevtx using this
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* value when `shared_outpoint`'s txid matches */
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struct bitcoin_tx *funding_tx;
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/* Track how many of each tx collab msg we receive */
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u16 tx_add_input_count, tx_add_output_count;
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/* Returns a PSBT with at least one change to the transaction as
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* compared to ictx->current_psbt.
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*
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* If set to NULL, the default implementation will simply return
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* ictx->desired_psbt.
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*
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* If no more changes are demanded, return NULL or current_psbt
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* unchanged to signal completion.
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*/
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struct wally_psbt *(*next_update_fn)(const tal_t *ctx,
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struct interactivetx_context *ictx);
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/* Set this to the intial psbt. Defaults to an empty PSBT. */
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struct wally_psbt *current_psbt;
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/* Optional field for storing your side's desired psbt state, to be
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* used inside 'next_update_fn'.
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*/
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struct wally_psbt *desired_psbt;
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/* If true, process_interactivetx_updates will return when local changes
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* are exhausted and 'tx_complete' will not be sent.
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*/
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bool pause_when_complete;
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/* Internal cached change set */
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struct psbt_changeset *change_set;
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};
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/* Builds a new default interactivetx context with default values */
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struct interactivetx_context *new_interactivetx_context(const tal_t *ctx,
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enum tx_role our_role,
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struct per_peer_state *pps,
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struct channel_id channel_id);
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/* Blocks the thread until we run out of changes (and we send tx_complete),
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* or an error occurs. If 'pause_when_complete' on the `interactivetx_context`
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* is set, this behavior changes and we return without sending tx_complete.
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*
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* If received_tx_complete is not NULL:
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* in -> true means we assume we've received tx_complete in a previous round.
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* out -> true means the last message from the peer was 'tx_complete'.
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*
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* Returns NULL on success or a description of the error on failure.
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*
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* If `tx_abort` is received, NULL is returned and `abort_msg` will be set to
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*/
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char *process_interactivetx_updates(const tal_t *ctx,
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struct interactivetx_context *ictx,
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bool *received_tx_complete,
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u8 **abort_msg);
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/* If the given ictx would cause `process_interactivetx_updates to send tx
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* changes when called. Returns true if an error occurs
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* (call `process_interactivetx_updates` for a description of the error).
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*/
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bool interactivetx_has_changes(struct interactivetx_context *ictx,
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struct wally_psbt *next_psbt);
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#endif /* LIGHTNING_COMMON_INTERACTIVETX_H */
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