1 package org.ldk.structs;
3 import org.ldk.impl.bindings;
4 import org.ldk.enums.*;
6 import java.util.Arrays;
10 * A PeerManager manages a set of peers, described by their [`SocketDescriptor`] and marshalls
11 * socket events into messages which it passes on to its [`MessageHandler`].
13 * Locks are taken internally, so you must never assume that reentrancy from a
14 * [`SocketDescriptor`] call back into [`PeerManager`] methods will not deadlock.
16 * Calls to [`read_event`] will decode relevant messages and pass them to the
17 * [`ChannelMessageHandler`], likely doing message processing in-line. Thus, the primary form of
18 * parallelism in Rust-Lightning is in calls to [`read_event`]. Note, however, that calls to any
19 * [`PeerManager`] functions related to the same connection must occur only in serial, making new
20 * calls only after previous ones have returned.
22 * Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
23 * a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
24 * essentially you should default to using a SimpleRefPeerManager, and use a
25 * SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
26 * you're using lightning-net-tokio.
28 * [`read_event`]: PeerManager::read_event
30 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
31 public class PeerManager extends CommonBase {
32 PeerManager(Object _dummy, long ptr) { super(ptr); }
33 @Override @SuppressWarnings("deprecation")
34 protected void finalize() throws Throwable {
36 if (ptr != 0) { bindings.PeerManager_free(ptr); }
40 * Constructs a new PeerManager with the given message handlers and node_id secret key
41 * ephemeral_random_data is used to derive per-connection ephemeral keys and must be
42 * cryptographically secure random bytes.
44 public static PeerManager of(ChannelMessageHandler message_handler_chan_handler_arg, RoutingMessageHandler message_handler_route_handler_arg, byte[] our_node_secret, byte[] ephemeral_random_data, Logger logger) {
45 long ret = bindings.PeerManager_new(bindings.MessageHandler_new(message_handler_chan_handler_arg == null ? 0 : message_handler_chan_handler_arg.ptr, message_handler_route_handler_arg == null ? 0 : message_handler_route_handler_arg.ptr), our_node_secret, ephemeral_random_data, logger == null ? 0 : logger.ptr);
46 if (ret < 1024) { return null; }
47 PeerManager ret_hu_conv = new PeerManager(null, ret);
48 ret_hu_conv.ptrs_to.add(ret_hu_conv);
49 ret_hu_conv.ptrs_to.add(message_handler_chan_handler_arg);
50 ret_hu_conv.ptrs_to.add(message_handler_route_handler_arg);
51 ret_hu_conv.ptrs_to.add(logger);
56 * Get the list of node ids for peers which have completed the initial handshake.
58 * For outbound connections, this will be the same as the their_node_id parameter passed in to
59 * new_outbound_connection, however entries will only appear once the initial handshake has
60 * completed and we are sure the remote peer has the private key for the given node_id.
62 public byte[][] get_peer_node_ids() {
63 byte[][] ret = bindings.PeerManager_get_peer_node_ids(this.ptr);
68 * Indicates a new outbound connection has been established to a node with the given node_id.
69 * Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
70 * descriptor but must disconnect the connection immediately.
72 * Returns a small number of bytes to send to the remote node (currently always 50).
74 * Panics if descriptor is duplicative with some other descriptor which has not yet been
75 * [`socket_disconnected()`].
77 * [`socket_disconnected()`]: PeerManager::socket_disconnected
79 public Result_CVec_u8ZPeerHandleErrorZ new_outbound_connection(byte[] their_node_id, SocketDescriptor descriptor) {
80 long ret = bindings.PeerManager_new_outbound_connection(this.ptr, their_node_id, descriptor == null ? 0 : descriptor.ptr);
81 if (ret < 1024) { return null; }
82 Result_CVec_u8ZPeerHandleErrorZ ret_hu_conv = Result_CVec_u8ZPeerHandleErrorZ.constr_from_ptr(ret);
83 this.ptrs_to.add(descriptor);
88 * Indicates a new inbound connection has been established.
90 * May refuse the connection by returning an Err, but will never write bytes to the remote end
91 * (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
92 * call socket_disconnected for the new descriptor but must disconnect the connection
95 * Panics if descriptor is duplicative with some other descriptor which has not yet been
96 * [`socket_disconnected()`].
98 * [`socket_disconnected()`]: PeerManager::socket_disconnected
100 public Result_NonePeerHandleErrorZ new_inbound_connection(SocketDescriptor descriptor) {
101 long ret = bindings.PeerManager_new_inbound_connection(this.ptr, descriptor == null ? 0 : descriptor.ptr);
102 if (ret < 1024) { return null; }
103 Result_NonePeerHandleErrorZ ret_hu_conv = Result_NonePeerHandleErrorZ.constr_from_ptr(ret);
104 this.ptrs_to.add(descriptor);
109 * Indicates that there is room to write data to the given socket descriptor.
111 * May return an Err to indicate that the connection should be closed.
113 * May call [`send_data`] on the descriptor passed in (or an equal descriptor) before
114 * returning. Thus, be very careful with reentrancy issues! The invariants around calling
115 * [`write_buffer_space_avail`] in case a write did not fully complete must still hold - be
116 * ready to call `[write_buffer_space_avail`] again if a write call generated here isn't
119 * [`send_data`]: SocketDescriptor::send_data
120 * [`write_buffer_space_avail`]: PeerManager::write_buffer_space_avail
122 public Result_NonePeerHandleErrorZ write_buffer_space_avail(SocketDescriptor descriptor) {
123 long ret = bindings.PeerManager_write_buffer_space_avail(this.ptr, descriptor == null ? 0 : descriptor.ptr);
124 if (ret < 1024) { return null; }
125 Result_NonePeerHandleErrorZ ret_hu_conv = Result_NonePeerHandleErrorZ.constr_from_ptr(ret);
126 this.ptrs_to.add(descriptor);
131 * Indicates that data was read from the given socket descriptor.
133 * May return an Err to indicate that the connection should be closed.
135 * Will *not* call back into [`send_data`] on any descriptors to avoid reentrancy complexity.
136 * Thus, however, you should call [`process_events`] after any `read_event` to generate
137 * [`send_data`] calls to handle responses.
139 * If `Ok(true)` is returned, further read_events should not be triggered until a
140 * [`send_data`] call on this descriptor has `resume_read` set (preventing DoS issues in the
143 * [`send_data`]: SocketDescriptor::send_data
144 * [`process_events`]: PeerManager::process_events
146 public Result_boolPeerHandleErrorZ read_event(SocketDescriptor peer_descriptor, byte[] data) {
147 long ret = bindings.PeerManager_read_event(this.ptr, peer_descriptor == null ? 0 : peer_descriptor.ptr, data);
148 if (ret < 1024) { return null; }
149 Result_boolPeerHandleErrorZ ret_hu_conv = Result_boolPeerHandleErrorZ.constr_from_ptr(ret);
150 this.ptrs_to.add(peer_descriptor);
155 * Checks for any events generated by our handlers and processes them. Includes sending most
156 * response messages as well as messages generated by calls to handler functions directly (eg
157 * functions like [`ChannelManager::process_pending_htlc_forwards`] or [`send_payment`]).
159 * May call [`send_data`] on [`SocketDescriptor`]s. Thus, be very careful with reentrancy
162 * [`send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
163 * [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
164 * [`send_data`]: SocketDescriptor::send_data
166 public void process_events() {
167 bindings.PeerManager_process_events(this.ptr);
171 * Indicates that the given socket descriptor's connection is now closed.
173 public void socket_disconnected(SocketDescriptor descriptor) {
174 bindings.PeerManager_socket_disconnected(this.ptr, descriptor == null ? 0 : descriptor.ptr);
175 this.ptrs_to.add(descriptor);
179 * Disconnect a peer given its node id.
181 * Set `no_connection_possible` to true to prevent any further connection with this peer,
182 * force-closing any channels we have with it.
184 * If a peer is connected, this will call [`disconnect_socket`] on the descriptor for the
185 * peer. Thus, be very careful about reentrancy issues.
187 * [`disconnect_socket`]: SocketDescriptor::disconnect_socket
189 public void disconnect_by_node_id(byte[] node_id, boolean no_connection_possible) {
190 bindings.PeerManager_disconnect_by_node_id(this.ptr, node_id, no_connection_possible);
194 * This function should be called roughly once every 30 seconds.
195 * It will send pings to each peer and disconnect those which did not respond to the last
198 * May call [`send_data`] on all [`SocketDescriptor`]s. Thus, be very careful with reentrancy
201 * [`send_data`]: SocketDescriptor::send_data
203 public void timer_tick_occurred() {
204 bindings.PeerManager_timer_tick_occurred(this.ptr);