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blocks.rs
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blocks.rs
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// Copyright 2017-2019 Parity Technologies (UK) Ltd.
// This file is part of substrate-archive.
// substrate-archive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// substrate-archive is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with substrate-archive. If not, see <http://www.gnu.org/licenses/>.
use super::{ActorPool, DatabaseActor, GetState, Metadata};
use crate::{
backend::{ReadOnlyBackend, RuntimeVersionCache},
database::queries,
error::Result,
types::{BatchBlock, Block},
};
use sp_runtime::{
generic::SignedBlock,
traits::{Block as BlockT, Header as _, NumberFor},
};
use std::sync::Arc;
use xtra::prelude::*;
type DatabaseAct<B> = Address<ActorPool<DatabaseActor<B>>>;
pub struct BlocksIndexer<B: BlockT>
where
NumberFor<B>: Into<u32>,
B: Unpin,
B::Hash: Unpin,
{
/// background task to crawl blocks
backend: Arc<ReadOnlyBackend<B>>,
db: DatabaseAct<B>,
meta: Address<Metadata<B>>,
rt_cache: RuntimeVersionCache<B>,
/// the last maximum block number from which we are sure every block before then is indexed
last_max: u32,
}
impl<B: BlockT + Unpin> BlocksIndexer<B>
where
B::Hash: Unpin,
NumberFor<B>: Into<u32>,
{
pub fn new(
backend: Arc<ReadOnlyBackend<B>>,
db_addr: DatabaseAct<B>,
meta: Address<Metadata<B>>,
) -> Self {
Self {
rt_cache: RuntimeVersionCache::new(backend.clone()),
last_max: 0,
backend,
db: db_addr,
meta,
}
}
/// A async wrapper around the backend fn `iter_blocks` which
/// runs in a `spawn_blocking` async task (its own thread)
async fn collect_blocks(
&self,
fun: impl Fn(u32) -> bool + Send + 'static,
) -> Result<Vec<Block<B>>> {
let backend = self.backend.clone();
let now = std::time::Instant::now();
let gather_blocks = move || -> Result<Vec<SignedBlock<B>>> {
Ok(backend
.iter_blocks(|n| fun(n))?
.enumerate()
.map(|(_, b)| b)
.collect())
};
let blocks = smol::unblock!(gather_blocks())?;
log::info!("Took {:?} to load {} blocks", now.elapsed(), blocks.len());
let cache = self.rt_cache.clone();
let blocks = smol::unblock!(cache.find_versions_as_blocks(blocks))?;
Ok(blocks)
}
/// First run of indexing
/// gets any blocks that are missing from database and indexes those.
/// sets the `last_max` value.
async fn re_index(&mut self) -> Result<Option<Vec<Block<B>>>> {
let mut conn = self.db.send(GetState::Conn.into()).await?.await?.conn();
let numbers = queries::missing_blocks_min_max(&mut conn, self.last_max).await?;
let len = numbers.len();
log::info!("{} missing blocks", len);
self.last_max = if let Some(m) = queries::max_block(&mut conn).await? {
m
} else {
// a `None` means that the blocks table is not populated yet
return Ok(None);
};
let blocks = self.collect_blocks(move |n| numbers.contains(&n)).await?;
Ok(Some(blocks))
}
async fn crawl(&mut self) -> Result<Vec<Block<B>>> {
let copied_last_max = self.last_max;
let blocks = self.collect_blocks(move |n| n > copied_last_max).await?;
self.last_max = blocks
.iter()
.map(|b| (*b.inner.block.header().number()).into())
.fold(self.last_max, |ac, e| if e > ac { e } else { ac });
Ok(blocks)
}
}
#[async_trait::async_trait]
impl<B: BlockT> Actor for BlocksIndexer<B>
where
NumberFor<B>: Into<u32>,
B: Unpin,
B::Hash: Unpin,
{
async fn started(&mut self, ctx: &mut Context<Self>) {
// using this instead of notify_immediately because
// ReIndexing is async process
ctx.address()
.expect("Actor just started")
.do_send(ReIndex)
.expect("Actor cannot be disconnected; just started");
ctx.notify_interval(std::time::Duration::from_secs(5), || Crawl);
}
}
struct Crawl;
impl Message for Crawl {
type Result = ();
}
#[async_trait::async_trait]
impl<B: BlockT + Unpin> Handler<Crawl> for BlocksIndexer<B>
where
NumberFor<B>: Into<u32>,
B::Hash: Unpin,
{
async fn handle(&mut self, _: Crawl, ctx: &mut Context<Self>) {
match self.crawl().await {
Err(e) => log::error!("{}", e.to_string()),
Ok(b) => {
if !b.is_empty() {
if let Err(_) = self.meta.send(BatchBlock::new(b)).await {
ctx.stop();
}
}
}
}
}
}
struct ReIndex;
impl Message for ReIndex {
type Result = ();
}
#[async_trait::async_trait]
impl<B: BlockT + Unpin> Handler<ReIndex> for BlocksIndexer<B>
where
NumberFor<B>: Into<u32>,
B::Hash: Unpin,
{
async fn handle(&mut self, _: ReIndex, ctx: &mut Context<Self>) {
match self.re_index().await {
Ok(Some(b)) => {
if let Err(_) = self.meta.send(BatchBlock::new(b)).await {
ctx.stop();
}
}
Ok(None) => {
return;
}
Err(e) => log::error!("{}", e.to_string()),
}
}
}
#[async_trait::async_trait]
impl<B: BlockT + Unpin> Handler<super::Die> for BlocksIndexer<B>
where
NumberFor<B>: Into<u32>,
B::Hash: Unpin,
{
async fn handle(&mut self, _: super::Die, ctx: &mut Context<Self>) -> Result<()> {
ctx.stop();
Ok(())
}
}