X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=ldk-c-bindings;a=blobdiff_plain;f=lightning-c-bindings%2Fsrc%2Flightning_rapid_gossip_sync%2Fmod.rs;fp=lightning-c-bindings%2Fsrc%2Flightning_rapid_gossip_sync%2Fmod.rs;h=4782b8c8d9e88b5af81c1a0518627ca663283e56;hp=0000000000000000000000000000000000000000;hb=45ad3320df3768514d968c70fc4b6a9d50028050;hpb=c014ce6a2df808ffec747f9a327c7f97bb1e3d08 diff --git a/lightning-c-bindings/src/lightning_rapid_gossip_sync/mod.rs b/lightning-c-bindings/src/lightning_rapid_gossip_sync/mod.rs new file mode 100644 index 0000000..4782b8c --- /dev/null +++ b/lightning-c-bindings/src/lightning_rapid_gossip_sync/mod.rs @@ -0,0 +1,156 @@ +// This file is Copyright its original authors, visible in version control +// history and in the source files from which this was generated. +// +// This file is licensed under the license available in the LICENSE or LICENSE.md +// file in the root of this repository or, if no such file exists, the same +// license as that which applies to the original source files from which this +// source was automatically generated. + +//! This crate exposes functionality to rapidly sync gossip data, aimed primarily at mobile +//! devices. +//! +//! The server sends a compressed response containing differential gossip data. The gossip data is +//! formatted compactly, omitting signatures and opportunistically incremental where previous +//! channel updates are known (a mechanism that is enabled when the timestamp of the last known +//! channel update is communicated). A reference server implementation can be found +//! [here](https://github.com/lightningdevkit/rapid-gossip-sync-server). +//! +//! An example server request could look as simple as the following. Note that the first ever rapid +//! sync should use `0` for `last_sync_timestamp`: +//! +//! ```shell +//! curl -o rapid_sync.lngossip https://rapidsync.lightningdevkit.org/snapshot/ +//! ``` +//! +//! Then, call the network processing function. In this example, we process the update by reading +//! its contents from disk, which we do by calling the `sync_network_graph_with_file_path` method: +//! +//! ``` +//! use bitcoin::blockdata::constants::genesis_block; +//! use bitcoin::Network; +//! use lightning::routing::gossip::NetworkGraph; +//! use lightning_rapid_gossip_sync::RapidGossipSync; +//! +//! # use lightning::util::logger::{Logger, Record}; +//! # struct FakeLogger {} +//! # impl Logger for FakeLogger { +//! # fn log(&self, record: &Record) { unimplemented!() } +//! # } +//! # let logger = FakeLogger {}; +//! +//! let block_hash = genesis_block(Network::Bitcoin).header.block_hash(); +//! let network_graph = NetworkGraph::new(block_hash, &logger); +//! let rapid_sync = RapidGossipSync::new(&network_graph); +//! let new_last_sync_timestamp_result = rapid_sync.sync_network_graph_with_file_path(\"./rapid_sync.lngossip\"); +//! ``` +//! +//! The primary benefit this syncing mechanism provides is that given a trusted server, a +//! low-powered client can offload the validation of gossip signatures. This enables a client to +//! privately calculate routes for payments, and do so much faster and earlier than requiring a full +//! peer-to-peer gossip sync to complete. +//! +//! The reason the rapid sync server requires trust is that it could provide bogus data, though at +//! worst, all that would result in is a fake network topology, which wouldn't enable the server to +//! steal or siphon off funds. It could, however, reduce the client's privacy by forcing all +//! payments to be routed via channels the server controls. +//! +//! The way a server is meant to calculate this rapid gossip sync data is by using a `latest_seen` +//! timestamp provided by the client. It's not included in either channel announcement or update, +//! (not least due to announcements not including any timestamps at all, but only a block height) +//! but rather, it's a timestamp of when the server saw a particular message. + +use alloc::str::FromStr; +use core::ffi::c_void; +use core::convert::Infallible; +use bitcoin::hashes::Hash; +use crate::c_types::*; +#[cfg(feature="no-std")] +use alloc::{vec::Vec, boxed::Box}; + +pub mod error; +pub mod processing; + +use lightning_rapid_gossip_sync::RapidGossipSync as nativeRapidGossipSyncImport; +pub(crate) type nativeRapidGossipSync = nativeRapidGossipSyncImport<&'static lightning::routing::gossip::NetworkGraph, crate::lightning::util::logger::Logger>; + +/// Rapid Gossip Sync struct +/// See [crate-level documentation] for usage. +/// +/// [crate-level documentation]: crate +#[must_use] +#[repr(C)] +pub struct RapidGossipSync { + /// A pointer to the opaque Rust object. + + /// Nearly everywhere, inner must be non-null, however in places where + /// the Rust equivalent takes an Option, it may be set to null to indicate None. + pub inner: *mut nativeRapidGossipSync, + /// Indicates that this is the only struct which contains the same pointer. + + /// Rust functions which take ownership of an object provided via an argument require + /// this to be true and invalidate the object pointed to by inner. + pub is_owned: bool, +} + +impl Drop for RapidGossipSync { + fn drop(&mut self) { + if self.is_owned && !<*mut nativeRapidGossipSync>::is_null(self.inner) { + let _ = unsafe { Box::from_raw(ObjOps::untweak_ptr(self.inner)) }; + } + } +} +/// Frees any resources used by the RapidGossipSync, if is_owned is set and inner is non-NULL. +#[no_mangle] +pub extern "C" fn RapidGossipSync_free(this_obj: RapidGossipSync) { } +#[allow(unused)] +/// Used only if an object of this type is returned as a trait impl by a method +pub(crate) extern "C" fn RapidGossipSync_free_void(this_ptr: *mut c_void) { + unsafe { let _ = Box::from_raw(this_ptr as *mut nativeRapidGossipSync); } +} +#[allow(unused)] +impl RapidGossipSync { + pub(crate) fn get_native_ref(&self) -> &'static nativeRapidGossipSync { + unsafe { &*ObjOps::untweak_ptr(self.inner) } + } + pub(crate) fn get_native_mut_ref(&self) -> &'static mut nativeRapidGossipSync { + unsafe { &mut *ObjOps::untweak_ptr(self.inner) } + } + /// When moving out of the pointer, we have to ensure we aren't a reference, this makes that easy + pub(crate) fn take_inner(mut self) -> *mut nativeRapidGossipSync { + assert!(self.is_owned); + let ret = ObjOps::untweak_ptr(self.inner); + self.inner = core::ptr::null_mut(); + ret + } +} +/// Instantiate a new [`RapidGossipSync`] instance +#[must_use] +#[no_mangle] +pub extern "C" fn RapidGossipSync_new(network_graph: &crate::lightning::routing::gossip::NetworkGraph) -> crate::lightning_rapid_gossip_sync::RapidGossipSync { + let mut ret = lightning_rapid_gossip_sync::RapidGossipSync::new(network_graph.get_native_ref()); + crate::lightning_rapid_gossip_sync::RapidGossipSync { inner: ObjOps::heap_alloc(ret), is_owned: true } +} + +/// Sync gossip data from a file +/// Returns the last sync timestamp to be used the next time rapid sync data is queried. +/// +/// `network_graph`: The network graph to apply the updates to +/// +/// `sync_path`: Path to the file where the gossip update data is located +/// +#[must_use] +#[no_mangle] +pub extern "C" fn RapidGossipSync_sync_network_graph_with_file_path(this_arg: &crate::lightning_rapid_gossip_sync::RapidGossipSync, mut sync_path: crate::c_types::Str) -> crate::c_types::derived::CResult_u32GraphSyncErrorZ { + let mut ret = unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.sync_network_graph_with_file_path(sync_path.into_str()); + let mut local_ret = match ret { Ok(mut o) => crate::c_types::CResultTempl::ok( { o }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning_rapid_gossip_sync::error::GraphSyncError::native_into(e) }).into() }; + local_ret +} + +/// Returns whether a rapid gossip sync has completed at least once +#[must_use] +#[no_mangle] +pub extern "C" fn RapidGossipSync_is_initial_sync_complete(this_arg: &crate::lightning_rapid_gossip_sync::RapidGossipSync) -> bool { + let mut ret = unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.is_initial_sync_complete(); + ret +} +