1 //! Events are returned from various bits in the library which indicate some action must be taken
4 //! Because we don't have a built-in runtime, its up to the client to call events at a time in the
5 //! future, as well as generate and broadcast funding transactions handle payment preimages and a
8 //! Note that many events are handled for you by PeerHandler, so in the common design of having a
9 //! PeerManager which marshalls messages to ChannelManager and Router you only need to call
10 //! process_events on the PeerHandler and then get_and_clear_pending_events and handle the events
11 //! that bubble up to the surface. If, however, you do not have a PeerHandler managing a
12 //! ChannelManager you need to handle all of the events which may be generated.
13 //TODO: We need better separation of event types ^
16 use chain::transaction::OutPoint;
17 use chain::keysinterface::SpendableOutputDescriptor;
19 use bitcoin::blockdata::script::Script;
21 use secp256k1::key::PublicKey;
23 use std::time::Instant;
25 /// An Event which you should probably take some action in response to.
27 /// Used to indicate that the client should generate a funding transaction with the given
28 /// parameters and then call ChannelManager::funding_transaction_generated.
29 /// Generated in ChannelManager message handling.
30 /// Note that *all inputs* in the funding transaction must spend SegWit outputs or your
31 /// counterparty can steal your funds!
32 FundingGenerationReady {
33 /// The random channel_id we picked which you'll need to pass into
34 /// ChannelManager::funding_transaction_generated.
35 temporary_channel_id: [u8; 32],
36 /// The value, in satoshis, that the output should have.
37 channel_value_satoshis: u64,
38 /// The script which should be used in the transaction output.
39 output_script: Script,
40 /// The value passed in to ChannelManager::create_channel
43 /// Used to indicate that the client may now broadcast the funding transaction it created for a
44 /// channel. Broadcasting such a transaction prior to this event may lead to our counterparty
45 /// trivially stealing all funds in the funding transaction!
46 FundingBroadcastSafe {
47 /// The output, which was passed to ChannelManager::funding_transaction_generated, which is
48 /// now safe to broadcast.
49 funding_txo: OutPoint,
50 /// The value passed in to ChannelManager::create_channel
53 /// Indicates we've received money! Just gotta dig out that payment preimage and feed it to
54 /// ChannelManager::claim_funds to get it....
55 /// Note that if the preimage is not known or the amount paid is incorrect, you must call
56 /// ChannelManager::fail_htlc_backwards with PaymentFailReason::PreimageUnknown or
57 /// PaymentFailReason::AmountMismatch, respectively, to free up resources for this HTLC.
58 /// The amount paid should be considered 'incorrect' when it is less than or more than twice
59 /// the amount expected.
61 /// The hash for which the preimage should be handed to the ChannelManager.
62 payment_hash: [u8; 32],
63 /// The value, in thousandths of a satoshi, that this payment is for.
66 /// Indicates an outbound payment we made succeeded (ie it made it all the way to its target
67 /// and we got back the payment preimage for it).
68 /// Note that duplicative PaymentSent Events may be generated - it is your responsibility to
69 /// deduplicate them by payment_preimage (which MUST be unique)!
71 /// The preimage to the hash given to ChannelManager::send_payment.
72 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
74 payment_preimage: [u8; 32],
76 /// Indicates an outbound payment we made failed. Probably some intermediary node dropped
77 /// something. You may wish to retry with a different route.
78 /// Note that duplicative PaymentFailed Events may be generated - it is your responsibility to
79 /// deduplicate them by payment_hash (which MUST be unique)!
81 /// The hash which was given to ChannelManager::send_payment.
82 payment_hash: [u8; 32],
83 /// Indicates the payment was rejected for some reason by the recipient. This implies that
84 /// the payment has failed, not just the route in question. If this is not set, you may
85 /// retry the payment via a different route.
86 rejected_by_dest: bool,
88 /// Used to indicate that ChannelManager::process_pending_htlc_forwards should be called at a
89 /// time in the future.
90 PendingHTLCsForwardable {
91 /// The earliest time at which process_pending_htlc_forwards should be called.
92 time_forwardable: Instant,
94 /// Used to indicate that an output was generated on-chain which you should know how to spend.
95 /// Such an output will *not* ever be spent by rust-lightning, so you need to store them
96 /// somewhere and spend them when you create on-chain spends.
98 /// The outputs which you should store as spendable by you.
99 outputs: Vec<SpendableOutputDescriptor>,
103 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
104 /// broadcast to most peers).
105 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
107 pub enum MessageSendEvent {
108 /// Used to indicate that we've accepted a channel open and should send the accept_channel
109 /// message provided to the given peer.
111 /// The node_id of the node which should receive this message
113 /// The message which should be sent.
114 msg: msgs::AcceptChannel,
116 /// Used to indicate that we've initiated a channel open and should send the open_channel
117 /// message provided to the given peer.
119 /// The node_id of the node which should receive this message
121 /// The message which should be sent.
122 msg: msgs::OpenChannel,
124 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
126 /// The node_id of the node which should receive this message
128 /// The message which should be sent.
129 msg: msgs::FundingCreated,
131 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
133 /// The node_id of the node which should receive this message
135 /// The message which should be sent.
136 msg: msgs::FundingSigned,
138 /// Used to indicate that a funding_locked message should be sent to the peer with the given node_id.
140 /// The node_id of the node which should receive these message(s)
142 /// The funding_locked message which should be sent.
143 msg: msgs::FundingLocked,
145 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
146 SendAnnouncementSignatures {
147 /// The node_id of the node which should receive these message(s)
149 /// The announcement_signatures message which should be sent.
150 msg: msgs::AnnouncementSignatures,
152 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
153 /// message should be sent to the peer with the given node_id.
155 /// The node_id of the node which should receive these message(s)
157 /// The update messages which should be sent. ALL messages in the struct should be sent!
158 updates: msgs::CommitmentUpdate,
160 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
162 /// The node_id of the node which should receive this message
164 /// The message which should be sent.
165 msg: msgs::RevokeAndACK,
167 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
169 /// The node_id of the node which should receive this message
171 /// The message which should be sent.
172 msg: msgs::ClosingSigned,
174 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
176 /// The node_id of the node which should receive this message
178 /// The message which should be sent.
181 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
182 SendChannelReestablish {
183 /// The node_id of the node which should receive this message
185 /// The message which should be sent.
186 msg: msgs::ChannelReestablish,
188 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
189 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
190 BroadcastChannelAnnouncement {
191 /// The channel_announcement which should be sent.
192 msg: msgs::ChannelAnnouncement,
193 /// The followup channel_update which should be sent.
194 update_msg: msgs::ChannelUpdate,
196 /// Used to indicate that a channel_update should be broadcast to all peers.
197 BroadcastChannelUpdate {
198 /// The channel_update which should be sent.
199 msg: msgs::ChannelUpdate,
201 /// Broadcast an error downstream to be handled
203 /// The node_id of the node which should receive this message
205 /// The action which should be taken.
206 action: Option<msgs::ErrorAction>
208 /// When a payment fails we may receive updates back from the hop where it failed. In such
209 /// cases this event is generated so that we can inform the router of this information.
210 PaymentFailureNetworkUpdate {
211 /// The channel/node update which should be sent to router
212 update: msgs::HTLCFailChannelUpdate,
216 /// A trait indicating an object may generate message send events
217 pub trait MessageSendEventsProvider {
218 /// Gets the list of pending events which were generated by previous actions, clearing the list
220 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
223 /// A trait indicating an object may generate events
224 pub trait EventsProvider {
225 /// Gets the list of pending events which were generated by previous actions, clearing the list
227 fn get_and_clear_pending_events(&self) -> Vec<Event>;