pub struct EventGraph {
Show 13 fields p2p: P2pPtr, dag: Tree, datastore: PathBuf, replay_mode: bool, unreferenced_tips: RwLock<BTreeMap<u64, HashSet<Hash>>>, broadcasted_ids: RwLock<HashSet<Hash>>, prune_task: OnceCell<StoppableTaskPtr>, pub event_pub: PublisherPtr<Event>, current_genesis: RwLock<Event>, days_rotation: u64, pub synced: RwLock<bool>, pub deg_enabled: RwLock<bool>, deg_publisher: PublisherPtr<DegEvent>,
}
Expand description

An Event Graph instance

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§p2p: P2pPtr

Pointer to the P2P network instance

§dag: Tree

Sled tree containing the DAG

§datastore: PathBuf§replay_mode: bool§unreferenced_tips: RwLock<BTreeMap<u64, HashSet<Hash>>>

The set of unreferenced DAG tips

§broadcasted_ids: RwLock<HashSet<Hash>>

A HashSet containg event IDs and their 1-level parents. These come from the events we’ve sent out using EventPut. They are used with EventReq to decide if we should reply or not. Additionally it is also used when we broadcast the TipRep message telling peers about our unreferenced tips.

§prune_task: OnceCell<StoppableTaskPtr>

DAG Pruning Task

§event_pub: PublisherPtr<Event>

Event publisher, this notifies whenever an event is inserted into the DAG

§current_genesis: RwLock<Event>

Current genesis event

§days_rotation: u64

Currently configured DAG rotation, in days

§synced: RwLock<bool>

Flag signalling DAG has finished initial sync

§deg_enabled: RwLock<bool>

Enable graph debugging

§deg_publisher: PublisherPtr<DegEvent>

The publisher for which we can give deg info over

Implementations§

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impl EventGraph

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pub async fn new( p2p: P2pPtr, sled_db: Db, datastore: PathBuf, replay_mode: bool, dag_tree_name: &str, days_rotation: u64, ex: Arc<Executor<'_>> ) -> Result<EventGraphPtr>

Create a new EventGraph instance.

  • days_rotation marks the lifetime of the DAG before it’s pruned.
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pub fn days_rotation(&self) -> u64

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async fn _handle_stop(&self, sled_db: Db)

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pub async fn dag_sync(&self) -> Result<()>

Sync the DAG from connected peers

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async fn dag_prune(&self, genesis_event: Event) -> Result<()>

Atomically prune the DAG and insert the given event as genesis.

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async fn dag_prune_task(self: Arc<Self>, days_rotation: u64) -> Result<()>

Background task periodically pruning the DAG.

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pub async fn dag_insert(&self, events: &[Event]) -> Result<Vec<Hash>>

Atomically insert given events into the DAG and return the event IDs. All provided events must be valid. An overlay is used over the DAG tree, temporary writting each event in order. After all events have been validated and inserted successfully, we write the overlay to sled. This will append the new events into the unreferenced tips set, and remove the events’ parents from it. It will also append the events’ level-1 parents to the broadcasted_ids set, so the P2P protocol knows that any requests for them are actually legitimate. TODO: The broadcasted_ids set should periodically be pruned, when some sensible time has passed after broadcasting the event.

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pub async fn dag_get(&self, event_id: &Hash) -> Result<Option<Event>>

Fetch an event from the DAG

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async fn get_next_layer_with_parents(&self) -> (u64, [Hash; 5])

Get next layer along with its N_EVENT_PARENTS from the unreferenced tips of the DAG. Since tips are mapped by their layer, we go backwards until we fill the vector, ensuring we always use latest layers tips as parents.

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async fn find_unreferenced_tips(&self) -> BTreeMap<u64, HashSet<Hash>>

Find the unreferenced tips in the current DAG state, mapped by their layers.

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async fn get_unreferenced_tips_sorted(&self) -> [Hash; 5]

Internal function used for DAG sorting.

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pub async fn order_events(&self) -> Vec<Hash>

Perform a topological sort of the DAG.

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fn dfs_topological_sort<'life0, 'life1, 'life_self, 'async_recursion>( &'life_self self, event: Event, visited: &'life0 mut HashSet<Hash>, ordered_events: &'life1 mut VecDeque<Hash> ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_recursion>>
where 'life0: 'async_recursion, 'life1: 'async_recursion, 'life_self: 'async_recursion,

We do a DFS (https://en.wikipedia.org/wiki/Depth-first_search), and additionally we consider the timestamps.

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async fn share_same_parents(&self, event_id1: &Hash, event_id2: &Hash) -> bool

Check if two events have the same parents

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pub async fn deg_enable(&self)

Enable graph debugging

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pub async fn deg_disable(&self)

Disable graph debugging

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pub async fn deg_subscribe(&self) -> Subscription<DegEvent>

Subscribe to deg events

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pub async fn deg_notify(&self, event: DegEvent)

Send a deg notification over the publisher

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pub async fn eventgraph_info(&self, id: u16, _params: JsonValue) -> JsonResult

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