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 FundingGenerationReady {
31 /// The random channel_id we picked which you'll need to pass into
32 /// ChannelManager::funding_transaction_generated.
33 temporary_channel_id: [u8; 32],
34 /// The value, in satoshis, that the output should have.
35 channel_value_satoshis: u64,
36 /// The script which should be used in the transaction output.
37 output_script: Script,
38 /// The value passed in to ChannelManager::create_channel
41 /// Used to indicate that the client may now broadcast the funding transaction it created for a
42 /// channel. Broadcasting such a transaction prior to this event may lead to our counterparty
43 /// trivially stealing all funds in the funding transaction!
44 FundingBroadcastSafe {
45 /// The output, which was passed to ChannelManager::funding_transaction_generated, which is
46 /// now safe to broadcast.
47 funding_txo: OutPoint,
48 /// The value passed in to ChannelManager::create_channel
51 /// Indicates we've received money! Just gotta dig out that payment preimage and feed it to
52 /// ChannelManager::claim_funds to get it....
53 /// Note that if the preimage is not known or the amount paid is incorrect, you must call
54 /// ChannelManager::fail_htlc_backwards with PaymentFailReason::PreimageUnknown or
55 /// PaymentFailReason::AmountMismatch, respectively, to free up resources for this HTLC.
56 /// The amount paid should be considered 'incorrect' when it is less than or more than twice
57 /// the amount expected.
59 /// The hash for which the preimage should be handed to the ChannelManager.
60 payment_hash: [u8; 32],
61 /// The value, in thousandths of a satoshi, that this payment is for.
64 /// Indicates an outbound payment we made succeeded (ie it made it all the way to its target
65 /// and we got back the payment preimage for it).
66 /// Note that duplicative PaymentSent Events may be generated - it is your responsibility to
67 /// deduplicate them by payment_preimage (which MUST be unique)!
69 /// The preimage to the hash given to ChannelManager::send_payment.
70 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
72 payment_preimage: [u8; 32],
74 /// Indicates an outbound payment we made failed. Probably some intermediary node dropped
75 /// something. You may wish to retry with a different route.
76 /// Note that duplicative PaymentFailed Events may be generated - it is your responsibility to
77 /// deduplicate them by payment_hash (which MUST be unique)!
79 /// The hash which was given to ChannelManager::send_payment.
80 payment_hash: [u8; 32],
81 /// Indicates the payment was rejected for some reason by the recipient. This implies that
82 /// the payment has failed, not just the route in question. If this is not set, you may
83 /// retry the payment via a different route.
84 rejected_by_dest: bool,
86 /// Used to indicate that ChannelManager::process_pending_htlc_forwards should be called at a
87 /// time in the future.
88 PendingHTLCsForwardable {
89 /// The earliest time at which process_pending_htlc_forwards should be called.
90 time_forwardable: Instant,
92 /// Used to indicate that an output was generated on-chain which you should know how to spend.
93 /// Such an output will *not* ever be spent by rust-lightning, so you need to store them
94 /// somewhere and spend them when you create on-chain spends.
96 /// The outputs which you should store as spendable by you.
97 outputs: Vec<SpendableOutputDescriptor>,
101 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
102 /// broadcast to most peers).
103 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
104 pub enum MessageSendEvent {
105 /// Used to indicate that we've accepted a channel open and should send the accept_channel
106 /// message provided to the given peer.
108 /// The node_id of the node which should receive this message
110 /// The message which should be sent.
111 msg: msgs::AcceptChannel,
113 /// Used to indicate that we've initiated a channel open and should send the open_channel
114 /// message provided to the given peer.
116 /// The node_id of the node which should receive this message
118 /// The message which should be sent.
119 msg: msgs::OpenChannel,
121 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
123 /// The node_id of the node which should receive this message
125 /// The message which should be sent.
126 msg: msgs::FundingCreated,
128 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
130 /// The node_id of the node which should receive this message
132 /// The message which should be sent.
133 msg: msgs::FundingSigned,
135 /// Used to indicate that a funding_locked message should be sent to the peer with the given node_id.
137 /// The node_id of the node which should receive these message(s)
139 /// The funding_locked message which should be sent.
140 msg: msgs::FundingLocked,
142 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
143 SendAnnouncementSignatures {
144 /// The node_id of the node which should receive these message(s)
146 /// The announcement_signatures message which should be sent.
147 msg: msgs::AnnouncementSignatures,
149 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
150 /// message should be sent to the peer with the given node_id.
152 /// The node_id of the node which should receive these message(s)
154 /// The update messages which should be sent. ALL messages in the struct should be sent!
155 updates: msgs::CommitmentUpdate,
157 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
159 /// The node_id of the node which should receive this message
161 /// The message which should be sent.
162 msg: msgs::RevokeAndACK,
164 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
166 /// The node_id of the node which should receive this message
168 /// The message which should be sent.
169 msg: msgs::ClosingSigned,
171 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
173 /// The node_id of the node which should receive this message
175 /// The message which should be sent.
178 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
179 SendChannelReestablish {
180 /// The node_id of the node which should receive this message
182 /// The message which should be sent.
183 msg: msgs::ChannelReestablish,
185 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
186 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
187 BroadcastChannelAnnouncement {
188 /// The channel_announcement which should be sent.
189 msg: msgs::ChannelAnnouncement,
190 /// The followup channel_update which should be sent.
191 update_msg: msgs::ChannelUpdate,
193 /// Used to indicate that a channel_update should be broadcast to all peers.
194 BroadcastChannelUpdate {
195 /// The channel_update which should be sent.
196 msg: msgs::ChannelUpdate,
198 /// Broadcast an error downstream to be handled
200 /// The node_id of the node which should receive this message
202 /// The action which should be taken.
203 action: Option<msgs::ErrorAction>
205 /// When a payment fails we may receive updates back from the hop where it failed. In such
206 /// cases this event is generated so that we can inform the router of this information.
207 PaymentFailureNetworkUpdate {
208 /// The channel/node update which should be sent to router
209 update: msgs::HTLCFailChannelUpdate,
213 /// A trait indicating an object may generate message send events
214 pub trait MessageSendEventsProvider {
215 /// Gets the list of pending events which were generated by previous actions, clearing the list
217 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
220 /// A trait indicating an object may generate events
221 pub trait EventsProvider {
222 /// Gets the list of pending events which were generated by previous actions, clearing the list
224 fn get_and_clear_pending_events(&self) -> Vec<Event>;