import org.ldk.enums.*;
import org.ldk.util.*;
import java.util.Arrays;
+import java.lang.ref.Reference;
+import javax.annotation.Nullable;
+
+/**
+ * A PeerManager manages a set of peers, described by their [`SocketDescriptor`] and marshalls
+ * socket events into messages which it passes on to its [`MessageHandler`].
+ *
+ * Locks are taken internally, so you must never assume that reentrancy from a
+ * [`SocketDescriptor`] call back into [`PeerManager`] methods will not deadlock.
+ *
+ * Calls to [`read_event`] will decode relevant messages and pass them to the
+ * [`ChannelMessageHandler`], likely doing message processing in-line. Thus, the primary form of
+ * parallelism in Rust-Lightning is in calls to [`read_event`]. Note, however, that calls to any
+ * [`PeerManager`] functions related to the same connection must occur only in serial, making new
+ * calls only after previous ones have returned.
+ *
+ * Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
+ * a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
+ * essentially you should default to using a SimpleRefPeerManager, and use a
+ * SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
+ * you're using lightning-net-tokio.
+ *
+ * [`read_event`]: PeerManager::read_event
+ */
@SuppressWarnings("unchecked") // We correctly assign various generic arrays
public class PeerManager extends CommonBase {
PeerManager(Object _dummy, long ptr) { super(ptr); }
if (ptr != 0) { bindings.PeerManager_free(ptr); }
}
- public static PeerManager constructor_new(ChannelMessageHandler message_handler_chan_handler_arg, RoutingMessageHandler message_handler_route_handler_arg, byte[] our_node_secret, byte[] ephemeral_random_data, Logger logger) {
- 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);
- PeerManager ret_hu_conv = new PeerManager(null, ret);
+ /**
+ * Constructs a new PeerManager with the given message handlers and node_id secret key
+ * ephemeral_random_data is used to derive per-connection ephemeral keys and must be
+ * cryptographically secure random bytes.
+ */
+ 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, CustomMessageHandler custom_message_handler) {
+ 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), InternalUtils.check_arr_len(our_node_secret, 32), InternalUtils.check_arr_len(ephemeral_random_data, 32), logger == null ? 0 : logger.ptr, custom_message_handler == null ? 0 : custom_message_handler.ptr);
+ Reference.reachabilityFence(message_handler_chan_handler_arg);
+ Reference.reachabilityFence(message_handler_route_handler_arg);
+ Reference.reachabilityFence(our_node_secret);
+ Reference.reachabilityFence(ephemeral_random_data);
+ Reference.reachabilityFence(logger);
+ Reference.reachabilityFence(custom_message_handler);
+ if (ret >= 0 && ret <= 4096) { return null; }
+ PeerManager ret_hu_conv = null; if (ret < 0 || ret > 4096) { ret_hu_conv = new PeerManager(null, ret); }
+ ret_hu_conv.ptrs_to.add(ret_hu_conv);
ret_hu_conv.ptrs_to.add(message_handler_chan_handler_arg);
ret_hu_conv.ptrs_to.add(message_handler_route_handler_arg);
ret_hu_conv.ptrs_to.add(logger);
+ ret_hu_conv.ptrs_to.add(custom_message_handler);
return ret_hu_conv;
}
+ /**
+ * Get the list of node ids for peers which have completed the initial handshake.
+ *
+ * For outbound connections, this will be the same as the their_node_id parameter passed in to
+ * new_outbound_connection, however entries will only appear once the initial handshake has
+ * completed and we are sure the remote peer has the private key for the given node_id.
+ */
public byte[][] get_peer_node_ids() {
byte[][] ret = bindings.PeerManager_get_peer_node_ids(this.ptr);
+ Reference.reachabilityFence(this);
return ret;
}
- public Result_CVec_u8ZPeerHandleErrorZ new_outbound_connection(byte[] their_node_id, SocketDescriptor descriptor) {
- long ret = bindings.PeerManager_new_outbound_connection(this.ptr, their_node_id, descriptor == null ? 0 : descriptor.ptr);
+ /**
+ * Indicates a new outbound connection has been established to a node with the given node_id
+ * and an optional remote network address.
+ *
+ * The remote network address adds the option to report a remote IP address back to a connecting
+ * peer using the init message.
+ * The user should pass the remote network address of the host they are connected to.
+ *
+ * Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
+ * descriptor but must disconnect the connection immediately.
+ *
+ * Returns a small number of bytes to send to the remote node (currently always 50).
+ *
+ * Panics if descriptor is duplicative with some other descriptor which has not yet been
+ * [`socket_disconnected()`].
+ *
+ * [`socket_disconnected()`]: PeerManager::socket_disconnected
+ */
+ public Result_CVec_u8ZPeerHandleErrorZ new_outbound_connection(byte[] their_node_id, SocketDescriptor descriptor, Option_NetAddressZ remote_network_address) {
+ long ret = bindings.PeerManager_new_outbound_connection(this.ptr, InternalUtils.check_arr_len(their_node_id, 33), descriptor == null ? 0 : descriptor.ptr, remote_network_address.ptr);
+ Reference.reachabilityFence(this);
+ Reference.reachabilityFence(their_node_id);
+ Reference.reachabilityFence(descriptor);
+ Reference.reachabilityFence(remote_network_address);
+ if (ret >= 0 && ret <= 4096) { return null; }
Result_CVec_u8ZPeerHandleErrorZ ret_hu_conv = Result_CVec_u8ZPeerHandleErrorZ.constr_from_ptr(ret);
this.ptrs_to.add(descriptor);
return ret_hu_conv;
}
- public Result_NonePeerHandleErrorZ new_inbound_connection(SocketDescriptor descriptor) {
- long ret = bindings.PeerManager_new_inbound_connection(this.ptr, descriptor == null ? 0 : descriptor.ptr);
+ /**
+ * Indicates a new inbound connection has been established to a node with an optional remote
+ * network address.
+ *
+ * The remote network address adds the option to report a remote IP address back to a connecting
+ * peer using the init message.
+ * The user should pass the remote network address of the host they are connected to.
+ *
+ * May refuse the connection by returning an Err, but will never write bytes to the remote end
+ * (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
+ * call socket_disconnected for the new descriptor but must disconnect the connection
+ * immediately.
+ *
+ * Panics if descriptor is duplicative with some other descriptor which has not yet been
+ * [`socket_disconnected()`].
+ *
+ * [`socket_disconnected()`]: PeerManager::socket_disconnected
+ */
+ public Result_NonePeerHandleErrorZ new_inbound_connection(SocketDescriptor descriptor, Option_NetAddressZ remote_network_address) {
+ long ret = bindings.PeerManager_new_inbound_connection(this.ptr, descriptor == null ? 0 : descriptor.ptr, remote_network_address.ptr);
+ Reference.reachabilityFence(this);
+ Reference.reachabilityFence(descriptor);
+ Reference.reachabilityFence(remote_network_address);
+ if (ret >= 0 && ret <= 4096) { return null; }
Result_NonePeerHandleErrorZ ret_hu_conv = Result_NonePeerHandleErrorZ.constr_from_ptr(ret);
this.ptrs_to.add(descriptor);
return ret_hu_conv;
}
+ /**
+ * Indicates that there is room to write data to the given socket descriptor.
+ *
+ * May return an Err to indicate that the connection should be closed.
+ *
+ * May call [`send_data`] on the descriptor passed in (or an equal descriptor) before
+ * returning. Thus, be very careful with reentrancy issues! The invariants around calling
+ * [`write_buffer_space_avail`] in case a write did not fully complete must still hold - be
+ * ready to call `[write_buffer_space_avail`] again if a write call generated here isn't
+ * sufficient!
+ *
+ * [`send_data`]: SocketDescriptor::send_data
+ * [`write_buffer_space_avail`]: PeerManager::write_buffer_space_avail
+ */
public Result_NonePeerHandleErrorZ write_buffer_space_avail(SocketDescriptor descriptor) {
long ret = bindings.PeerManager_write_buffer_space_avail(this.ptr, descriptor == null ? 0 : descriptor.ptr);
+ Reference.reachabilityFence(this);
+ Reference.reachabilityFence(descriptor);
+ if (ret >= 0 && ret <= 4096) { return null; }
Result_NonePeerHandleErrorZ ret_hu_conv = Result_NonePeerHandleErrorZ.constr_from_ptr(ret);
- this.ptrs_to.add(descriptor);
return ret_hu_conv;
}
+ /**
+ * Indicates that data was read from the given socket descriptor.
+ *
+ * May return an Err to indicate that the connection should be closed.
+ *
+ * Will *not* call back into [`send_data`] on any descriptors to avoid reentrancy complexity.
+ * Thus, however, you should call [`process_events`] after any `read_event` to generate
+ * [`send_data`] calls to handle responses.
+ *
+ * If `Ok(true)` is returned, further read_events should not be triggered until a
+ * [`send_data`] call on this descriptor has `resume_read` set (preventing DoS issues in the
+ * send buffer).
+ *
+ * [`send_data`]: SocketDescriptor::send_data
+ * [`process_events`]: PeerManager::process_events
+ */
public Result_boolPeerHandleErrorZ read_event(SocketDescriptor peer_descriptor, byte[] data) {
long ret = bindings.PeerManager_read_event(this.ptr, peer_descriptor == null ? 0 : peer_descriptor.ptr, data);
+ Reference.reachabilityFence(this);
+ Reference.reachabilityFence(peer_descriptor);
+ Reference.reachabilityFence(data);
+ if (ret >= 0 && ret <= 4096) { return null; }
Result_boolPeerHandleErrorZ ret_hu_conv = Result_boolPeerHandleErrorZ.constr_from_ptr(ret);
- this.ptrs_to.add(peer_descriptor);
return ret_hu_conv;
}
+ /**
+ * Checks for any events generated by our handlers and processes them. Includes sending most
+ * response messages as well as messages generated by calls to handler functions directly (eg
+ * functions like [`ChannelManager::process_pending_htlc_forwards`] or [`send_payment`]).
+ *
+ * May call [`send_data`] on [`SocketDescriptor`]s. Thus, be very careful with reentrancy
+ * issues!
+ *
+ * You don't have to call this function explicitly if you are using [`lightning-net-tokio`]
+ * or one of the other clients provided in our language bindings.
+ *
+ * [`send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
+ * [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
+ * [`send_data`]: SocketDescriptor::send_data
+ */
public void process_events() {
bindings.PeerManager_process_events(this.ptr);
+ Reference.reachabilityFence(this);
}
+ /**
+ * Indicates that the given socket descriptor's connection is now closed.
+ */
public void socket_disconnected(SocketDescriptor descriptor) {
bindings.PeerManager_socket_disconnected(this.ptr, descriptor == null ? 0 : descriptor.ptr);
- this.ptrs_to.add(descriptor);
+ Reference.reachabilityFence(this);
+ Reference.reachabilityFence(descriptor);
+ }
+
+ /**
+ * Disconnect a peer given its node id.
+ *
+ * Set `no_connection_possible` to true to prevent any further connection with this peer,
+ * force-closing any channels we have with it.
+ *
+ * If a peer is connected, this will call [`disconnect_socket`] on the descriptor for the
+ * peer. Thus, be very careful about reentrancy issues.
+ *
+ * [`disconnect_socket`]: SocketDescriptor::disconnect_socket
+ */
+ public void disconnect_by_node_id(byte[] node_id, boolean no_connection_possible) {
+ bindings.PeerManager_disconnect_by_node_id(this.ptr, InternalUtils.check_arr_len(node_id, 33), no_connection_possible);
+ Reference.reachabilityFence(this);
+ Reference.reachabilityFence(node_id);
+ Reference.reachabilityFence(no_connection_possible);
+ }
+
+ /**
+ * Disconnects all currently-connected peers. This is useful on platforms where there may be
+ * an indication that TCP sockets have stalled even if we weren't around to time them out
+ * using regular ping/pongs.
+ */
+ public void disconnect_all_peers() {
+ bindings.PeerManager_disconnect_all_peers(this.ptr);
+ Reference.reachabilityFence(this);
}
- public void timer_tick_occured() {
- bindings.PeerManager_timer_tick_occured(this.ptr);
+ /**
+ * Send pings to each peer and disconnect those which did not respond to the last round of
+ * pings.
+ *
+ * This may be called on any timescale you want, however, roughly once every ten seconds is
+ * preferred. The call rate determines both how often we send a ping to our peers and how much
+ * time they have to respond before we disconnect them.
+ *
+ * May call [`send_data`] on all [`SocketDescriptor`]s. Thus, be very careful with reentrancy
+ * issues!
+ *
+ * [`send_data`]: SocketDescriptor::send_data
+ */
+ public void timer_tick_occurred() {
+ bindings.PeerManager_timer_tick_occurred(this.ptr);
+ Reference.reachabilityFence(this);
}
}
projects / ldk-java / blobdiff