1454 lines
55 KiB
Rust
1454 lines
55 KiB
Rust
///! Rate-limited communication with a web3 provider.
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use super::blockchain::{ArcBlock, BlocksByHashCache, Web3ProxyBlock};
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use super::provider::Web3Provider;
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use super::request::{OpenRequestHandle, OpenRequestResult};
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use crate::app::{flatten_handle, AnyhowJoinHandle};
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use crate::config::{BlockAndRpc, Web3RpcConfig};
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use crate::frontend::authorization::Authorization;
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use crate::rpcs::request::RequestRevertHandler;
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use anyhow::{anyhow, Context};
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use ethers::prelude::{Bytes, Middleware, ProviderError, TxHash, H256, U64};
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use ethers::types::{Address, Transaction, U256};
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use futures::future::try_join_all;
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use futures::StreamExt;
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use log::{debug, error, info, trace, warn, Level};
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use migration::sea_orm::DatabaseConnection;
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use ordered_float::OrderedFloat;
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use parking_lot::RwLock;
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use redis_rate_limiter::{RedisPool, RedisRateLimitResult, RedisRateLimiter};
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use serde::ser::{SerializeStruct, Serializer};
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use serde::Serialize;
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use serde_json::json;
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use std::cmp::min;
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use std::fmt;
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use std::hash::{Hash, Hasher};
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use std::sync::atomic::{self, AtomicU64, AtomicUsize};
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use std::{cmp::Ordering, sync::Arc};
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use thread_fast_rng::rand::Rng;
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use thread_fast_rng::thread_fast_rng;
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use tokio::sync::{broadcast, oneshot, watch, RwLock as AsyncRwLock};
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use tokio::time::{sleep, sleep_until, timeout, Duration, Instant};
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pub struct Latency {
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/// exponentially weighted moving average of how many milliseconds behind the fastest node we are
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ewma: ewma::EWMA,
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}
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impl Serialize for Latency {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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serializer.serialize_f64(self.ewma.value())
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}
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}
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impl Latency {
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#[inline(always)]
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pub fn record(&mut self, duration: Duration) {
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self.record_ms(duration.as_secs_f64() * 1000.0);
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}
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#[inline(always)]
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pub fn record_ms(&mut self, milliseconds: f64) {
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self.ewma.add(milliseconds);
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}
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#[inline(always)]
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pub fn value(&self) -> f64 {
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self.ewma.value()
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}
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}
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impl Default for Latency {
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fn default() -> Self {
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// TODO: what should the default span be? 25 requests? have a "new"
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let span = 25.0;
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let start = 1000.0;
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Self::new(span, start)
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}
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}
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impl Latency {
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// depending on the span, start might not be perfect
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pub fn new(span: f64, start: f64) -> Self {
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let alpha = Self::span_to_alpha(span);
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let mut ewma = ewma::EWMA::new(alpha);
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if start > 0.0 {
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for _ in 0..(span as u64) {
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ewma.add(start);
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}
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}
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Self { ewma }
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}
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fn span_to_alpha(span: f64) -> f64 {
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2.0 / (span + 1.0)
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}
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}
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/// An active connection to a Web3 RPC server like geth or erigon.
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#[derive(Default)]
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pub struct Web3Rpc {
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pub name: String,
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pub display_name: Option<String>,
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pub db_conn: Option<DatabaseConnection>,
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pub(super) ws_url: Option<String>,
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pub(super) http_url: Option<String>,
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/// Some connections use an http_client. we keep a clone for reconnecting
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pub(super) http_client: Option<reqwest::Client>,
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/// provider is in a RwLock so that we can replace it if re-connecting
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/// it is an async lock because we hold it open across awaits
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/// this provider is only used for new heads subscriptions
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/// TODO: put the provider inside an arc?
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pub(super) provider: AsyncRwLock<Option<Arc<Web3Provider>>>,
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/// keep track of hard limits
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pub(super) hard_limit_until: Option<watch::Sender<Instant>>,
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/// rate limits are stored in a central redis so that multiple proxies can share their rate limits
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/// We do not use the deferred rate limiter because going over limits would cause errors
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pub(super) hard_limit: Option<RedisRateLimiter>,
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/// used for load balancing to the least loaded server
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pub(super) soft_limit: u32,
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/// use web3 queries to find the block data limit for archive/pruned nodes
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pub(super) automatic_block_limit: bool,
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/// only use this rpc if everything else is lagging too far. this allows us to ignore fast but very low limit rpcs
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pub(super) backup: bool,
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/// TODO: have an enum for this so that "no limit" prints pretty?
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pub(super) block_data_limit: AtomicU64,
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/// Lower tiers are higher priority when sending requests
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pub(super) tier: u64,
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/// TODO: change this to a watch channel so that http providers can subscribe and take action on change.
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pub(super) head_block: RwLock<Option<Web3ProxyBlock>>,
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/// Track head block latency
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pub(super) head_latency: RwLock<Latency>,
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// /// Track request latency
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// /// TODO: refactor this. this lock kills perf. for now just use head_latency
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// pub(super) request_latency: RwLock<Latency>,
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/// Track total requests served
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/// TODO: maybe move this to graphana
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pub(super) total_requests: AtomicUsize,
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pub(super) active_requests: AtomicUsize,
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}
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impl Web3Rpc {
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/// Connect to a web3 rpc
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// TODO: have this take a builder (which will have channels attached). or maybe just take the config and give the config public fields
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#[allow(clippy::too_many_arguments)]
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pub async fn spawn(
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mut config: Web3RpcConfig,
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name: String,
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chain_id: u64,
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db_conn: Option<DatabaseConnection>,
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// optional because this is only used for http providers. websocket providers don't use it
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http_client: Option<reqwest::Client>,
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// TODO: rename to http_new_head_interval_sender?
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http_interval_sender: Option<Arc<broadcast::Sender<()>>>,
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redis_pool: Option<RedisPool>,
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// TODO: think more about soft limit. watching ewma of requests is probably better. but what should the random sort be on? maybe group on tier is enough
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// soft_limit: u32,
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block_map: BlocksByHashCache,
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block_sender: Option<flume::Sender<BlockAndRpc>>,
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tx_id_sender: Option<flume::Sender<(TxHash, Arc<Self>)>>,
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reconnect: bool,
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) -> anyhow::Result<(Arc<Web3Rpc>, AnyhowJoinHandle<()>)> {
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let hard_limit = match (config.hard_limit, redis_pool) {
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(None, None) => None,
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(Some(hard_limit), Some(redis_pool)) => {
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// TODO: in process rate limiter instead? or is deffered good enough?
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let rrl = RedisRateLimiter::new(
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"web3_proxy",
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&format!("{}:{}", chain_id, name),
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hard_limit,
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60.0,
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redis_pool,
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);
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Some(rrl)
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}
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(None, Some(_)) => None,
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(Some(_hard_limit), None) => {
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return Err(anyhow::anyhow!(
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"no redis client pool! needed for hard limit"
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))
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}
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};
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let tx_id_sender = if config.subscribe_txs {
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// TODO: warn if tx_id_sender is None?
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tx_id_sender
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} else {
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None
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};
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let backup = config.backup;
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let block_data_limit: AtomicU64 = config.block_data_limit.unwrap_or_default().into();
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let automatic_block_limit =
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(block_data_limit.load(atomic::Ordering::Acquire) == 0) && block_sender.is_some();
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// track hard limit until on backup servers (which might surprise us with rate limit changes)
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// and track on servers that have a configured hard limit
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let hard_limit_until = if backup || hard_limit.is_some() {
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let (sender, _) = watch::channel(Instant::now());
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Some(sender)
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} else {
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None
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};
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if config.ws_url.is_none() && config.http_url.is_none() {
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if let Some(url) = config.url {
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if url.starts_with("ws") {
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config.ws_url = Some(url);
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} else if url.starts_with("http") {
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config.http_url = Some(url);
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} else {
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return Err(anyhow!("only ws or http urls are supported"));
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}
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} else {
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return Err(anyhow!(
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"either ws_url or http_url are required. it is best to set both"
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));
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}
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}
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let new_connection = Self {
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name,
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db_conn: db_conn.clone(),
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display_name: config.display_name,
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http_client,
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ws_url: config.ws_url,
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http_url: config.http_url,
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hard_limit,
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hard_limit_until,
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soft_limit: config.soft_limit,
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automatic_block_limit,
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backup,
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block_data_limit,
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tier: config.tier,
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..Default::default()
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};
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let new_connection = Arc::new(new_connection);
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// subscribe to new blocks and new transactions
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// subscribing starts the connection (with retries)
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// TODO: make transaction subscription optional (just pass None for tx_id_sender)
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let handle = {
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let new_connection = new_connection.clone();
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let authorization = Arc::new(Authorization::internal(db_conn)?);
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tokio::spawn(async move {
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new_connection
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.subscribe(
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&authorization,
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block_map,
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block_sender,
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chain_id,
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http_interval_sender,
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reconnect,
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tx_id_sender,
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)
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.await
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})
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};
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Ok((new_connection, handle))
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}
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pub async fn peak_ewma(&self) -> OrderedFloat<f64> {
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// TODO: use request instead of head latency? that was killing perf though
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let head_ewma = self.head_latency.read().value();
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// TODO: what ordering?
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let active_requests = self.active_requests.load(atomic::Ordering::Relaxed) as f64;
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// TODO: i'm not sure head * active is exactly right. but we'll see
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// TODO: i don't think this actually counts as peak. investigate with atomics.rs and peak_ewma.rs
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OrderedFloat(head_ewma * active_requests)
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}
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// TODO: would be great if rpcs exposed this. see https://github.com/ledgerwatch/erigon/issues/6391
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async fn check_block_data_limit(
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self: &Arc<Self>,
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authorization: &Arc<Authorization>,
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unlocked_provider: Option<Arc<Web3Provider>>,
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) -> anyhow::Result<Option<u64>> {
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if !self.automatic_block_limit {
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// TODO: is this a good thing to return?
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return Ok(None);
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}
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// TODO: check eth_syncing. if it is not false, return Ok(None)
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let mut limit = None;
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// TODO: binary search between 90k and max?
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// TODO: start at 0 or 1?
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for block_data_limit in [0, 32, 64, 128, 256, 512, 1024, 90_000, u64::MAX] {
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let handle = self
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.wait_for_request_handle(authorization, None, unlocked_provider.clone())
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.await?;
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let head_block_num_future = handle.request::<Option<()>, U256>(
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"eth_blockNumber",
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&None,
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// error here are expected, so keep the level low
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Level::Debug.into(),
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unlocked_provider.clone(),
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);
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let head_block_num = timeout(Duration::from_secs(5), head_block_num_future)
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.await
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.context("timeout fetching eth_blockNumber")?
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.context("provider error")?;
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let maybe_archive_block = head_block_num.saturating_sub((block_data_limit).into());
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trace!(
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"checking maybe_archive_block on {}: {}",
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self,
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maybe_archive_block
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);
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// TODO: wait for the handle BEFORE we check the current block number. it might be delayed too!
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// TODO: what should the request be?
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let handle = self
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.wait_for_request_handle(authorization, None, unlocked_provider.clone())
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.await?;
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let archive_result: Result<Bytes, _> = handle
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.request(
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"eth_getCode",
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&json!((
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"0xdead00000000000000000000000000000000beef",
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maybe_archive_block,
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)),
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// error here are expected, so keep the level low
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Level::Trace.into(),
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unlocked_provider.clone(),
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)
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.await;
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trace!(
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"archive_result on {} for {} ({}): {:?}",
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self,
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block_data_limit,
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maybe_archive_block,
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archive_result
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);
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if archive_result.is_err() {
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break;
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}
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limit = Some(block_data_limit);
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}
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if let Some(limit) = limit {
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if limit == 0 {
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warn!("{} is unable to serve requests", self);
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}
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self.block_data_limit
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.store(limit, atomic::Ordering::Release);
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}
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if limit == Some(u64::MAX) {
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info!("block data limit on {}: archive", self);
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} else {
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info!("block data limit on {}: {:?}", self, limit);
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}
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Ok(limit)
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}
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/// TODO: this might be too simple. different nodes can prune differently. its possible we will have a block range
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pub fn block_data_limit(&self) -> U64 {
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self.block_data_limit.load(atomic::Ordering::Acquire).into()
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}
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pub fn has_block_data(&self, needed_block_num: &U64) -> bool {
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let head_block_num = match self.head_block.read().as_ref() {
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None => return false,
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Some(x) => *x.number(),
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};
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// this rpc doesn't have that block yet. still syncing
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if needed_block_num > &head_block_num {
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return false;
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}
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// if this is a pruning node, we might not actually have the block
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let block_data_limit: U64 = self.block_data_limit();
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let oldest_block_num = head_block_num.saturating_sub(block_data_limit);
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*needed_block_num >= oldest_block_num
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}
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/// reconnect to the provider. errors are retried forever with exponential backoff with jitter.
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/// We use the "Decorrelated" jitter from <https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/>
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/// TODO: maybe it would be better to use "Full Jitter". The "Full Jitter" approach uses less work, but slightly more time.
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pub async fn retrying_connect(
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self: &Arc<Self>,
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block_sender: Option<&flume::Sender<BlockAndRpc>>,
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chain_id: u64,
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db_conn: Option<&DatabaseConnection>,
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delay_start: bool,
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) -> anyhow::Result<()> {
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// there are several crates that have retry helpers, but they all seem more complex than necessary
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// TODO: move this backoff logic into a helper function so we can use it when doing database locking
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let base_ms = 500;
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let cap_ms = 30_000;
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let range_multiplier = 3;
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|
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// sleep once before the initial retry attempt
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// TODO: now that we use this method for our initial connection, do we still want this sleep?
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let mut sleep_ms = if delay_start {
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let first_sleep_ms = min(
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cap_ms,
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thread_fast_rng().gen_range(base_ms..(base_ms * range_multiplier)),
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);
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let reconnect_in = Duration::from_millis(first_sleep_ms);
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info!("Reconnect to {} in {}ms", self, reconnect_in.as_millis());
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sleep(reconnect_in).await;
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first_sleep_ms
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} else {
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base_ms
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};
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|
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// retry until we succeed
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while let Err(err) = self.connect(block_sender, chain_id, db_conn).await {
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// thread_rng is crytographically secure. we don't need that here
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sleep_ms = min(
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cap_ms,
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thread_fast_rng().gen_range(base_ms..(sleep_ms * range_multiplier)),
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);
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|
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let retry_in = Duration::from_millis(sleep_ms);
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|
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let error_level = if self.backup {
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log::Level::Debug
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} else {
|
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log::Level::Info
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};
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|
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log::log!(
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error_level,
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"Failed reconnect to {}! Retry in {}ms. err={:?}",
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self,
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retry_in.as_millis(),
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err,
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);
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|
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sleep(retry_in).await;
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}
|
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|
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Ok(())
|
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}
|
|
|
|
/// connect to the web3 provider
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|
async fn connect(
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self: &Arc<Self>,
|
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block_sender: Option<&flume::Sender<BlockAndRpc>>,
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chain_id: u64,
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db_conn: Option<&DatabaseConnection>,
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) -> anyhow::Result<()> {
|
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if let Ok(mut unlocked_provider) = self.provider.try_write() {
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|
#[cfg(test)]
|
|
if let Some(Web3Provider::Mock) = unlocked_provider.as_deref() {
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return Ok(());
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}
|
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|
|
*unlocked_provider = if let Some(ws_url) = self.ws_url.as_ref() {
|
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// set up ws client
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|
match &*unlocked_provider {
|
|
None => {
|
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info!("connecting to {}", self);
|
|
}
|
|
Some(_) => {
|
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debug!("reconnecting to {}", self);
|
|
|
|
// tell the block subscriber that this rpc doesn't have any blocks
|
|
if let Some(block_sender) = block_sender {
|
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block_sender
|
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.send_async((None, self.clone()))
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.await
|
|
.context("block_sender during connect")?;
|
|
}
|
|
|
|
// reset sync status
|
|
let mut head_block = self.head_block.write();
|
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*head_block = None;
|
|
|
|
// disconnect the current provider
|
|
// TODO: what until the block_sender's receiver finishes updating this item?
|
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*unlocked_provider = None;
|
|
}
|
|
}
|
|
|
|
let p = Web3Provider::from_str(ws_url.as_str(), None)
|
|
.await
|
|
.context(format!("failed connecting to {}", ws_url))?;
|
|
|
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assert!(p.ws().is_some());
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|
|
Some(Arc::new(p))
|
|
} else {
|
|
// http client
|
|
if let Some(url) = &self.http_url {
|
|
let p = Web3Provider::from_str(url, self.http_client.clone())
|
|
.await
|
|
.context(format!("failed connecting to {}", url))?;
|
|
|
|
assert!(p.http().is_some());
|
|
|
|
Some(Arc::new(p))
|
|
} else {
|
|
None
|
|
}
|
|
};
|
|
|
|
let authorization = Arc::new(Authorization::internal(db_conn.cloned())?);
|
|
|
|
// check the server's chain_id here
|
|
// TODO: some public rpcs (on bsc and fantom) do not return an id and so this ends up being an error
|
|
// TODO: what should the timeout be? should there be a request timeout?
|
|
// trace!("waiting on chain id for {}", self);
|
|
let found_chain_id: Result<U64, _> = self
|
|
.wait_for_request_handle(&authorization, None, unlocked_provider.clone())
|
|
.await?
|
|
.request(
|
|
"eth_chainId",
|
|
&json!(Option::None::<()>),
|
|
Level::Trace.into(),
|
|
unlocked_provider.clone(),
|
|
)
|
|
.await;
|
|
// trace!("found_chain_id: {:?}", found_chain_id);
|
|
|
|
match found_chain_id {
|
|
Ok(found_chain_id) => {
|
|
// TODO: there has to be a cleaner way to do this
|
|
if chain_id != found_chain_id.as_u64() {
|
|
return Err(anyhow::anyhow!(
|
|
"incorrect chain id! Config has {}, but RPC has {}",
|
|
chain_id,
|
|
found_chain_id
|
|
)
|
|
.context(format!("failed @ {}", self)));
|
|
}
|
|
}
|
|
Err(e) => {
|
|
return Err(anyhow::Error::from(e));
|
|
}
|
|
}
|
|
|
|
self.check_block_data_limit(&authorization, unlocked_provider.clone())
|
|
.await?;
|
|
|
|
drop(unlocked_provider);
|
|
|
|
info!("successfully connected to {}", self);
|
|
} else {
|
|
if self.provider.read().await.is_none() {
|
|
return Err(anyhow!("failed waiting for client"));
|
|
}
|
|
};
|
|
|
|
Ok(())
|
|
}
|
|
|
|
async fn send_head_block_result(
|
|
self: &Arc<Self>,
|
|
new_head_block: Result<Option<ArcBlock>, ProviderError>,
|
|
block_sender: &flume::Sender<BlockAndRpc>,
|
|
block_map: BlocksByHashCache,
|
|
) -> anyhow::Result<()> {
|
|
let new_head_block = match new_head_block {
|
|
Ok(None) => {
|
|
{
|
|
let mut head_block = self.head_block.write();
|
|
|
|
if head_block.is_none() {
|
|
// we previously sent a None. return early
|
|
return Ok(());
|
|
}
|
|
warn!("clearing head block on {}!", self);
|
|
|
|
*head_block = None;
|
|
}
|
|
|
|
None
|
|
}
|
|
Ok(Some(new_head_block)) => {
|
|
let new_head_block = Web3ProxyBlock::try_new(new_head_block).unwrap();
|
|
|
|
let new_hash = *new_head_block.hash();
|
|
|
|
// if we already have this block saved, set new_head_block to that arc. otherwise store this copy
|
|
let new_head_block = block_map
|
|
.get_with(new_hash, async move { new_head_block })
|
|
.await;
|
|
|
|
// save the block so we don't send the same one multiple times
|
|
// also save so that archive checks can know how far back to query
|
|
{
|
|
let mut head_block = self.head_block.write();
|
|
|
|
let _ = head_block.insert(new_head_block.clone().into());
|
|
}
|
|
|
|
if self.block_data_limit() == U64::zero() {
|
|
let authorization = Arc::new(Authorization::internal(self.db_conn.clone())?);
|
|
if let Err(err) = self.check_block_data_limit(&authorization, None).await {
|
|
warn!(
|
|
"failed checking block limit after {} finished syncing. {:?}",
|
|
self, err
|
|
);
|
|
}
|
|
}
|
|
|
|
Some(new_head_block)
|
|
}
|
|
Err(err) => {
|
|
warn!("unable to get block from {}. err={:?}", self, err);
|
|
|
|
{
|
|
let mut head_block = self.head_block.write();
|
|
|
|
*head_block = None;
|
|
}
|
|
|
|
None
|
|
}
|
|
};
|
|
|
|
// send an empty block to take this server out of rotation
|
|
block_sender
|
|
.send_async((new_head_block, self.clone()))
|
|
.await
|
|
.context("block_sender")?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// subscribe to blocks and transactions with automatic reconnects
|
|
/// This should only exit when the program is exiting.
|
|
/// TODO: should more of these args be on self?
|
|
#[allow(clippy::too_many_arguments)]
|
|
async fn subscribe(
|
|
self: Arc<Self>,
|
|
authorization: &Arc<Authorization>,
|
|
block_map: BlocksByHashCache,
|
|
block_sender: Option<flume::Sender<BlockAndRpc>>,
|
|
chain_id: u64,
|
|
http_interval_sender: Option<Arc<broadcast::Sender<()>>>,
|
|
reconnect: bool,
|
|
tx_id_sender: Option<flume::Sender<(TxHash, Arc<Self>)>>,
|
|
) -> anyhow::Result<()> {
|
|
let revert_handler = if self.backup {
|
|
RequestRevertHandler::DebugLevel
|
|
} else {
|
|
RequestRevertHandler::ErrorLevel
|
|
};
|
|
|
|
loop {
|
|
let http_interval_receiver = http_interval_sender.as_ref().map(|x| x.subscribe());
|
|
|
|
let mut futures = vec![];
|
|
|
|
{
|
|
// health check
|
|
// TODO: move this into a proper function
|
|
let authorization = authorization.clone();
|
|
let block_sender = block_sender.clone();
|
|
let conn = self.clone();
|
|
let (ready_tx, ready_rx) = oneshot::channel();
|
|
let f = async move {
|
|
// initial sleep to allow for the initial connection
|
|
conn.retrying_connect(
|
|
block_sender.as_ref(),
|
|
chain_id,
|
|
authorization.db_conn.as_ref(),
|
|
false,
|
|
)
|
|
.await?;
|
|
|
|
// provider is ready
|
|
ready_tx.send(()).unwrap();
|
|
|
|
// TODO: how often? different depending on the chain?
|
|
// TODO: reset this timeout when a new block is seen? we need to keep request_latency updated though
|
|
let health_sleep_seconds = 10;
|
|
|
|
// TODO: benchmark this and lock contention
|
|
let mut old_total_requests = 0;
|
|
let mut new_total_requests;
|
|
|
|
loop {
|
|
sleep(Duration::from_secs(health_sleep_seconds)).await;
|
|
|
|
// TODO: what if we just happened to have this check line up with another restart?
|
|
// TODO: think more about this
|
|
if let Some(client) = conn.provider.read().await.clone() {
|
|
// health check as a way of keeping this rpc's request_ewma accurate
|
|
// TODO: do something different if this is a backup server?
|
|
|
|
new_total_requests =
|
|
conn.total_requests.load(atomic::Ordering::Relaxed);
|
|
|
|
if new_total_requests - old_total_requests < 10 {
|
|
// TODO: if this fails too many times, reset the connection
|
|
// TODO: move this into a function and the chaining should be easier
|
|
let head_block = conn.head_block.read().clone();
|
|
|
|
if let Some((block_number, txid)) = head_block.and_then(|x| {
|
|
let block = x.block.clone();
|
|
|
|
let block_number = block.number?;
|
|
let txid = block.transactions.last().cloned()?;
|
|
|
|
Some((block_number, txid))
|
|
}) {
|
|
let to = conn
|
|
.wait_for_query::<_, Option<Transaction>>(
|
|
"eth_getTransactionByHash",
|
|
&(txid,),
|
|
revert_handler,
|
|
authorization.clone(),
|
|
Some(client.clone()),
|
|
)
|
|
.await
|
|
.and_then(|tx| {
|
|
let tx = tx.context("no transaction found")?;
|
|
|
|
// TODO: what default? something real?
|
|
let to = tx.to.unwrap_or_else(|| {
|
|
"0xdead00000000000000000000000000000000beef"
|
|
.parse::<Address>()
|
|
.expect("deafbeef")
|
|
});
|
|
|
|
Ok(to)
|
|
});
|
|
|
|
let code = match to {
|
|
Err(err) => {
|
|
if conn.backup {
|
|
debug!(
|
|
"{} failed health check query! {:#?}",
|
|
conn, err
|
|
);
|
|
} else {
|
|
warn!(
|
|
"{} failed health check query! {:#?}",
|
|
conn, err
|
|
);
|
|
}
|
|
continue;
|
|
}
|
|
Ok(to) => {
|
|
conn.wait_for_query::<_, Option<Bytes>>(
|
|
"eth_getCode",
|
|
&(to, block_number),
|
|
revert_handler,
|
|
authorization.clone(),
|
|
Some(client),
|
|
)
|
|
.await
|
|
}
|
|
};
|
|
|
|
if let Err(err) = code {
|
|
if conn.backup {
|
|
debug!(
|
|
"{} failed health check query! {:#?}",
|
|
conn, err
|
|
);
|
|
} else {
|
|
warn!("{} failed health check query! {:#?}", conn, err);
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
old_total_requests = new_total_requests;
|
|
}
|
|
}
|
|
};
|
|
|
|
futures.push(flatten_handle(tokio::spawn(f)));
|
|
|
|
// wait on the initial connection
|
|
ready_rx.await?;
|
|
}
|
|
|
|
if let Some(block_sender) = &block_sender {
|
|
let f = self.clone().subscribe_new_heads(
|
|
authorization.clone(),
|
|
http_interval_receiver,
|
|
block_sender.clone(),
|
|
block_map.clone(),
|
|
);
|
|
|
|
futures.push(flatten_handle(tokio::spawn(f)));
|
|
}
|
|
|
|
if let Some(tx_id_sender) = &tx_id_sender {
|
|
let f = self
|
|
.clone()
|
|
.subscribe_pending_transactions(authorization.clone(), tx_id_sender.clone());
|
|
|
|
futures.push(flatten_handle(tokio::spawn(f)));
|
|
}
|
|
|
|
match try_join_all(futures).await {
|
|
Ok(_) => {
|
|
// futures all exited without error. break instead of restarting subscriptions
|
|
break;
|
|
}
|
|
Err(err) => {
|
|
if reconnect {
|
|
warn!("{} connection ended. err={:?}", self, err);
|
|
|
|
self.clone()
|
|
.retrying_connect(
|
|
block_sender.as_ref(),
|
|
chain_id,
|
|
authorization.db_conn.as_ref(),
|
|
true,
|
|
)
|
|
.await?;
|
|
} else {
|
|
error!("{} subscription exited. err={:?}", self, err);
|
|
return Err(err);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
info!("all subscriptions on {} completed", self);
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Subscribe to new blocks.
|
|
async fn subscribe_new_heads(
|
|
self: Arc<Self>,
|
|
authorization: Arc<Authorization>,
|
|
http_interval_receiver: Option<broadcast::Receiver<()>>,
|
|
block_sender: flume::Sender<BlockAndRpc>,
|
|
block_map: BlocksByHashCache,
|
|
) -> anyhow::Result<()> {
|
|
trace!("watching new heads on {}", self);
|
|
|
|
let unlocked_provider = self.provider.read().await;
|
|
|
|
match unlocked_provider.as_deref() {
|
|
Some(Web3Provider::Http(_client)) => {
|
|
// there is a "watch_blocks" function, but a lot of public nodes do not support the necessary rpc endpoints
|
|
// TODO: try watch_blocks and fall back to this?
|
|
|
|
let mut http_interval_receiver = http_interval_receiver.unwrap();
|
|
|
|
let mut last_hash = H256::zero();
|
|
|
|
loop {
|
|
// TODO: what should the max_wait be?
|
|
match self
|
|
.wait_for_request_handle(&authorization, None, unlocked_provider.clone())
|
|
.await
|
|
{
|
|
Ok(active_request_handle) => {
|
|
let block: Result<Option<ArcBlock>, _> = active_request_handle
|
|
.request(
|
|
"eth_getBlockByNumber",
|
|
&json!(("latest", false)),
|
|
Level::Warn.into(),
|
|
None,
|
|
)
|
|
.await;
|
|
|
|
match block {
|
|
Ok(None) => {
|
|
warn!("no head block on {}", self);
|
|
|
|
self.send_head_block_result(
|
|
Ok(None),
|
|
&block_sender,
|
|
block_map.clone(),
|
|
)
|
|
.await?;
|
|
}
|
|
Ok(Some(block)) => {
|
|
// don't send repeat blocks
|
|
let new_hash =
|
|
block.hash.expect("blocks here should always have hashes");
|
|
|
|
if new_hash != last_hash {
|
|
// new hash!
|
|
last_hash = new_hash;
|
|
|
|
self.send_head_block_result(
|
|
Ok(Some(block)),
|
|
&block_sender,
|
|
block_map.clone(),
|
|
)
|
|
.await?;
|
|
}
|
|
}
|
|
Err(err) => {
|
|
// we did not get a block back. something is up with the server. take it out of rotation
|
|
self.send_head_block_result(
|
|
Err(err),
|
|
&block_sender,
|
|
block_map.clone(),
|
|
)
|
|
.await?;
|
|
}
|
|
}
|
|
}
|
|
Err(err) => {
|
|
warn!("Internal error on latest block from {}. {:?}", self, err);
|
|
|
|
self.send_head_block_result(Ok(None), &block_sender, block_map.clone())
|
|
.await?;
|
|
|
|
// TODO: what should we do? sleep? extra time?
|
|
}
|
|
}
|
|
|
|
// wait for the next interval
|
|
// TODO: if error or rate limit, increase interval?
|
|
while let Err(err) = http_interval_receiver.recv().await {
|
|
match err {
|
|
broadcast::error::RecvError::Closed => {
|
|
// channel is closed! that's not good. bubble the error up
|
|
return Err(err.into());
|
|
}
|
|
broadcast::error::RecvError::Lagged(lagged) => {
|
|
// querying the block was delayed
|
|
// this can happen if tokio is very busy or waiting for requests limits took too long
|
|
if self.backup {
|
|
debug!("http interval on {} lagging by {}!", self, lagged);
|
|
} else {
|
|
warn!("http interval on {} lagging by {}!", self, lagged);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Some(Web3Provider::Both(_, client)) | Some(Web3Provider::Ws(client)) => {
|
|
// todo: move subscribe_blocks onto the request handle?
|
|
let active_request_handle = self
|
|
.wait_for_request_handle(&authorization, None, unlocked_provider.clone())
|
|
.await;
|
|
let mut stream = client.subscribe_blocks().await?;
|
|
drop(active_request_handle);
|
|
|
|
// query the block once since the subscription doesn't send the current block
|
|
// there is a very small race condition here where the stream could send us a new block right now
|
|
// but all that does is print "new block" for the same block as current block
|
|
// TODO: how does this get wrapped in an arc? does ethers handle that?
|
|
// TODO: do this part over http?
|
|
let block: Result<Option<ArcBlock>, _> = self
|
|
.wait_for_request_handle(&authorization, None, unlocked_provider.clone())
|
|
.await?
|
|
.request(
|
|
"eth_getBlockByNumber",
|
|
&json!(("latest", false)),
|
|
Level::Warn.into(),
|
|
unlocked_provider.clone(),
|
|
)
|
|
.await;
|
|
|
|
let mut last_hash = match &block {
|
|
Ok(Some(new_block)) => new_block
|
|
.hash
|
|
.expect("blocks should always have a hash here"),
|
|
_ => H256::zero(),
|
|
};
|
|
|
|
self.send_head_block_result(block, &block_sender, block_map.clone())
|
|
.await?;
|
|
|
|
while let Some(new_block) = stream.next().await {
|
|
// TODO: check the new block's hash to be sure we don't send dupes
|
|
let new_hash = new_block
|
|
.hash
|
|
.expect("blocks should always have a hash here");
|
|
|
|
if new_hash == last_hash {
|
|
// some rpcs like to give us duplicates. don't waste our time on them
|
|
continue;
|
|
} else {
|
|
last_hash = new_hash;
|
|
}
|
|
|
|
self.send_head_block_result(
|
|
Ok(Some(Arc::new(new_block))),
|
|
&block_sender,
|
|
block_map.clone(),
|
|
)
|
|
.await?;
|
|
}
|
|
|
|
// clear the head block. this might not be needed, but it won't hurt
|
|
self.send_head_block_result(Ok(None), &block_sender, block_map)
|
|
.await?;
|
|
|
|
// TODO: is this always an error?
|
|
// TODO: we probably don't want a warn and to return error
|
|
warn!("new_heads subscription to {} ended", self);
|
|
Err(anyhow::anyhow!("new_heads subscription ended"))
|
|
}
|
|
None => todo!("what should happen now? wait for a connection?"),
|
|
#[cfg(test)]
|
|
Some(Web3Provider::Mock) => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
/// Turn on the firehose of pending transactions
|
|
async fn subscribe_pending_transactions(
|
|
self: Arc<Self>,
|
|
authorization: Arc<Authorization>,
|
|
tx_id_sender: flume::Sender<(TxHash, Arc<Self>)>,
|
|
) -> anyhow::Result<()> {
|
|
// TODO: give this a separate client. don't use new_head_client for everything. especially a firehose this big
|
|
// TODO: timeout
|
|
let provider = self.provider.read().await;
|
|
|
|
trace!("watching pending transactions on {}", self);
|
|
// TODO: does this keep the lock open for too long?
|
|
match provider.as_deref() {
|
|
None => {
|
|
// TODO: wait for a provider
|
|
return Err(anyhow!("no provider"));
|
|
}
|
|
Some(Web3Provider::Http(provider)) => {
|
|
// there is a "watch_pending_transactions" function, but a lot of public nodes do not support the necessary rpc endpoints
|
|
// TODO: maybe subscribe to self.head_block?
|
|
// TODO: this keeps a read lock guard open on provider_state forever. is that okay for an http client?
|
|
futures::future::pending::<()>().await;
|
|
}
|
|
Some(Web3Provider::Both(_, client)) | Some(Web3Provider::Ws(client)) => {
|
|
// TODO: maybe the subscribe_pending_txs function should be on the active_request_handle
|
|
let active_request_handle = self
|
|
.wait_for_request_handle(&authorization, None, provider.clone())
|
|
.await?;
|
|
|
|
let mut stream = client.subscribe_pending_txs().await?;
|
|
|
|
drop(active_request_handle);
|
|
|
|
while let Some(pending_tx_id) = stream.next().await {
|
|
tx_id_sender
|
|
.send_async((pending_tx_id, self.clone()))
|
|
.await
|
|
.context("tx_id_sender")?;
|
|
|
|
// TODO: periodically check for listeners. if no one is subscribed, unsubscribe and wait for a subscription
|
|
}
|
|
|
|
// TODO: is this always an error?
|
|
// TODO: we probably don't want a warn and to return error
|
|
warn!("pending_transactions subscription ended on {}", self);
|
|
return Err(anyhow::anyhow!("pending_transactions subscription ended"));
|
|
}
|
|
#[cfg(test)]
|
|
Some(Web3Provider::Mock) => futures::future::pending::<()>().await,
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// be careful with this; it might wait forever!
|
|
/// `allow_not_ready` is only for use by health checks while starting the provider
|
|
/// TODO: don't use anyhow. use specific error type
|
|
pub async fn wait_for_request_handle<'a>(
|
|
self: &'a Arc<Self>,
|
|
authorization: &'a Arc<Authorization>,
|
|
max_wait: Option<Duration>,
|
|
unlocked_provider: Option<Arc<Web3Provider>>,
|
|
) -> anyhow::Result<OpenRequestHandle> {
|
|
let max_wait = max_wait.map(|x| Instant::now() + x);
|
|
|
|
loop {
|
|
match self
|
|
.try_request_handle(authorization, unlocked_provider.clone())
|
|
.await
|
|
{
|
|
Ok(OpenRequestResult::Handle(handle)) => return Ok(handle),
|
|
Ok(OpenRequestResult::RetryAt(retry_at)) => {
|
|
// TODO: emit a stat?
|
|
let wait = retry_at.duration_since(Instant::now());
|
|
|
|
trace!(
|
|
"waiting {} millis for request handle on {}",
|
|
wait.as_millis(),
|
|
self
|
|
);
|
|
|
|
if let Some(max_wait) = max_wait {
|
|
if retry_at > max_wait {
|
|
// break now since we will wait past our maximum wait time
|
|
// TODO: don't use anyhow. use specific error type
|
|
return Err(anyhow::anyhow!("timeout waiting for request handle"));
|
|
}
|
|
}
|
|
|
|
sleep_until(retry_at).await;
|
|
}
|
|
Ok(OpenRequestResult::NotReady) => {
|
|
// TODO: when can this happen? log? emit a stat?
|
|
trace!("{} has no handle ready", self);
|
|
|
|
if let Some(max_wait) = max_wait {
|
|
let now = Instant::now();
|
|
|
|
if now > max_wait {
|
|
return Err(anyhow::anyhow!("unable to retry for request handle"));
|
|
}
|
|
}
|
|
|
|
// TODO: sleep how long? maybe just error?
|
|
// TODO: instead of an arbitrary sleep, subscribe to the head block on this
|
|
sleep(Duration::from_millis(10)).await;
|
|
}
|
|
Err(err) => return Err(err),
|
|
}
|
|
}
|
|
}
|
|
|
|
pub async fn try_request_handle(
|
|
self: &Arc<Self>,
|
|
authorization: &Arc<Authorization>,
|
|
// TODO: borrow on this instead of needing to clone the Arc?
|
|
unlocked_provider: Option<Arc<Web3Provider>>,
|
|
) -> anyhow::Result<OpenRequestResult> {
|
|
// TODO: think more about this read block
|
|
// TODO: this should *not* be new_head_client. this should be a separate object
|
|
if unlocked_provider.is_some() || self.provider.read().await.is_some() {
|
|
// we already have an unlocked provider. no need to lock
|
|
} else {
|
|
return Ok(OpenRequestResult::NotReady);
|
|
}
|
|
|
|
if let Some(hard_limit_until) = self.hard_limit_until.as_ref() {
|
|
let hard_limit_ready = hard_limit_until.borrow().clone();
|
|
|
|
let now = Instant::now();
|
|
|
|
if now < hard_limit_ready {
|
|
return Ok(OpenRequestResult::RetryAt(hard_limit_ready));
|
|
}
|
|
}
|
|
|
|
// check rate limits
|
|
if let Some(ratelimiter) = self.hard_limit.as_ref() {
|
|
// TODO: how should we know if we should set expire or not?
|
|
match ratelimiter
|
|
.throttle()
|
|
.await
|
|
.context(format!("attempting to throttle {}", self))?
|
|
{
|
|
RedisRateLimitResult::Allowed(_) => {
|
|
// trace!("rate limit succeeded")
|
|
}
|
|
RedisRateLimitResult::RetryAt(retry_at, _) => {
|
|
// rate limit gave us a wait time
|
|
if !self.backup {
|
|
let when = retry_at.duration_since(Instant::now());
|
|
warn!(
|
|
"Exhausted rate limit on {}. Retry in {}ms",
|
|
self,
|
|
when.as_millis()
|
|
);
|
|
}
|
|
|
|
if let Some(hard_limit_until) = self.hard_limit_until.as_ref() {
|
|
hard_limit_until.send_replace(retry_at.clone());
|
|
}
|
|
|
|
return Ok(OpenRequestResult::RetryAt(retry_at));
|
|
}
|
|
RedisRateLimitResult::RetryNever => {
|
|
return Ok(OpenRequestResult::NotReady);
|
|
}
|
|
}
|
|
};
|
|
|
|
let handle = OpenRequestHandle::new(authorization.clone(), self.clone()).await;
|
|
|
|
Ok(OpenRequestResult::Handle(handle))
|
|
}
|
|
|
|
pub async fn wait_for_query<P, R>(
|
|
self: &Arc<Self>,
|
|
method: &str,
|
|
params: &P,
|
|
revert_handler: RequestRevertHandler,
|
|
authorization: Arc<Authorization>,
|
|
unlocked_provider: Option<Arc<Web3Provider>>,
|
|
) -> anyhow::Result<R>
|
|
where
|
|
// TODO: not sure about this type. would be better to not need clones, but measure and spawns combine to need it
|
|
P: Clone + fmt::Debug + serde::Serialize + Send + Sync + 'static,
|
|
R: serde::Serialize + serde::de::DeserializeOwned + fmt::Debug,
|
|
{
|
|
self.wait_for_request_handle(&authorization, None, None)
|
|
.await?
|
|
.request::<P, R>(method, params, revert_handler, unlocked_provider)
|
|
.await
|
|
.context("ProviderError from the backend")
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for Web3Provider {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
// TODO: the default Debug takes forever to write. this is too quiet though. we at least need the url
|
|
f.debug_struct("Web3Provider").finish_non_exhaustive()
|
|
}
|
|
}
|
|
|
|
impl Hash for Web3Rpc {
|
|
fn hash<H: Hasher>(&self, state: &mut H) {
|
|
// TODO: is this enough?
|
|
self.name.hash(state);
|
|
}
|
|
}
|
|
|
|
impl Eq for Web3Rpc {}
|
|
|
|
impl Ord for Web3Rpc {
|
|
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
|
|
self.name.cmp(&other.name)
|
|
}
|
|
}
|
|
|
|
impl PartialOrd for Web3Rpc {
|
|
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
|
|
Some(self.cmp(other))
|
|
}
|
|
}
|
|
|
|
impl PartialEq for Web3Rpc {
|
|
fn eq(&self, other: &Self) -> bool {
|
|
self.name == other.name
|
|
}
|
|
}
|
|
|
|
impl Serialize for Web3Rpc {
|
|
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
|
|
where
|
|
S: Serializer,
|
|
{
|
|
// 3 is the number of fields in the struct.
|
|
let mut state = serializer.serialize_struct("Web3Rpc", 10)?;
|
|
|
|
// the url is excluded because it likely includes private information. just show the name that we use in keys
|
|
state.serialize_field("name", &self.name)?;
|
|
// a longer name for display to users
|
|
state.serialize_field("display_name", &self.display_name)?;
|
|
|
|
state.serialize_field("backup", &self.backup)?;
|
|
|
|
match self.block_data_limit.load(atomic::Ordering::Relaxed) {
|
|
u64::MAX => {
|
|
state.serialize_field("block_data_limit", &None::<()>)?;
|
|
}
|
|
block_data_limit => {
|
|
state.serialize_field("block_data_limit", &block_data_limit)?;
|
|
}
|
|
}
|
|
|
|
state.serialize_field("tier", &self.tier)?;
|
|
|
|
state.serialize_field("soft_limit", &self.soft_limit)?;
|
|
|
|
// TODO: maybe this is too much data. serialize less?
|
|
state.serialize_field("head_block", &*self.head_block.read())?;
|
|
|
|
state.serialize_field("head_latency", &self.head_latency.read().value())?;
|
|
|
|
state.serialize_field(
|
|
"total_requests",
|
|
&self.total_requests.load(atomic::Ordering::Relaxed),
|
|
)?;
|
|
|
|
state.end()
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for Web3Rpc {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
let mut f = f.debug_struct("Web3Rpc");
|
|
|
|
f.field("name", &self.name);
|
|
|
|
let block_data_limit = self.block_data_limit.load(atomic::Ordering::Relaxed);
|
|
if block_data_limit == u64::MAX {
|
|
f.field("blocks", &"all");
|
|
} else {
|
|
f.field("blocks", &block_data_limit);
|
|
}
|
|
|
|
f.finish_non_exhaustive()
|
|
}
|
|
}
|
|
|
|
impl fmt::Display for Web3Rpc {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
// TODO: filter basic auth and api keys
|
|
write!(f, "{}", &self.name)
|
|
}
|
|
}
|
|
|
|
mod tests {
|
|
#![allow(unused_imports)]
|
|
use super::*;
|
|
use ethers::types::{Block, U256};
|
|
use std::time::{SystemTime, UNIX_EPOCH};
|
|
|
|
#[test]
|
|
fn test_archive_node_has_block_data() {
|
|
let now = SystemTime::now()
|
|
.duration_since(UNIX_EPOCH)
|
|
.expect("cannot tell the time")
|
|
.as_secs()
|
|
.into();
|
|
|
|
let random_block = Block {
|
|
hash: Some(H256::random()),
|
|
number: Some(1_000_000.into()),
|
|
timestamp: now,
|
|
..Default::default()
|
|
};
|
|
|
|
let random_block = Arc::new(random_block);
|
|
|
|
let head_block = Web3ProxyBlock::try_new(random_block).unwrap();
|
|
let block_data_limit = u64::MAX;
|
|
|
|
let x = Web3Rpc {
|
|
name: "name".to_string(),
|
|
ws_url: Some("ws://example.com".to_string()),
|
|
soft_limit: 1_000,
|
|
automatic_block_limit: false,
|
|
backup: false,
|
|
block_data_limit: block_data_limit.into(),
|
|
tier: 0,
|
|
head_block: RwLock::new(Some(head_block.clone())),
|
|
..Default::default()
|
|
};
|
|
|
|
assert!(x.has_block_data(&0.into()));
|
|
assert!(x.has_block_data(&1.into()));
|
|
assert!(x.has_block_data(&head_block.number()));
|
|
assert!(!x.has_block_data(&(head_block.number() + 1)));
|
|
assert!(!x.has_block_data(&(head_block.number() + 1000)));
|
|
}
|
|
|
|
#[test]
|
|
fn test_pruned_node_has_block_data() {
|
|
let now = SystemTime::now()
|
|
.duration_since(UNIX_EPOCH)
|
|
.expect("cannot tell the time")
|
|
.as_secs()
|
|
.into();
|
|
|
|
let head_block: Web3ProxyBlock = Arc::new(Block {
|
|
hash: Some(H256::random()),
|
|
number: Some(1_000_000.into()),
|
|
timestamp: now,
|
|
..Default::default()
|
|
})
|
|
.try_into()
|
|
.unwrap();
|
|
|
|
let block_data_limit = 64;
|
|
|
|
let x = Web3Rpc {
|
|
name: "name".to_string(),
|
|
soft_limit: 1_000,
|
|
automatic_block_limit: false,
|
|
backup: false,
|
|
block_data_limit: block_data_limit.into(),
|
|
tier: 0,
|
|
head_block: RwLock::new(Some(head_block.clone())),
|
|
..Default::default()
|
|
};
|
|
|
|
assert!(!x.has_block_data(&0.into()));
|
|
assert!(!x.has_block_data(&1.into()));
|
|
assert!(!x.has_block_data(&(head_block.number() - block_data_limit - 1)));
|
|
assert!(x.has_block_data(&(head_block.number() - block_data_limit)));
|
|
assert!(x.has_block_data(&head_block.number()));
|
|
assert!(!x.has_block_data(&(head_block.number() + 1)));
|
|
assert!(!x.has_block_data(&(head_block.number() + 1000)));
|
|
}
|
|
|
|
/*
|
|
// TODO: think about how to bring the concept of a "lagged" node back
|
|
#[test]
|
|
fn test_lagged_node_not_has_block_data() {
|
|
let now: U256 = SystemTime::now()
|
|
.duration_since(UNIX_EPOCH)
|
|
.expect("cannot tell the time")
|
|
.as_secs()
|
|
.into();
|
|
|
|
// head block is an hour old
|
|
let head_block = Block {
|
|
hash: Some(H256::random()),
|
|
number: Some(1_000_000.into()),
|
|
timestamp: now - 3600,
|
|
..Default::default()
|
|
};
|
|
|
|
let head_block = Arc::new(head_block);
|
|
|
|
let head_block = SavedBlock::new(head_block);
|
|
let block_data_limit = u64::MAX;
|
|
|
|
let metrics = OpenRequestHandleMetrics::default();
|
|
|
|
let x = Web3Rpc {
|
|
name: "name".to_string(),
|
|
db_conn: None,
|
|
display_name: None,
|
|
url: "ws://example.com".to_string(),
|
|
http_client: None,
|
|
active_requests: 0.into(),
|
|
frontend_requests: 0.into(),
|
|
internal_requests: 0.into(),
|
|
provider_state: AsyncRwLock::new(ProviderState::None),
|
|
hard_limit: None,
|
|
soft_limit: 1_000,
|
|
automatic_block_limit: false,
|
|
backup: false,
|
|
block_data_limit: block_data_limit.into(),
|
|
tier: 0,
|
|
head_block: RwLock::new(Some(head_block.clone())),
|
|
};
|
|
|
|
assert!(!x.has_block_data(&0.into()));
|
|
assert!(!x.has_block_data(&1.into()));
|
|
assert!(!x.has_block_data(&head_block.number()));
|
|
assert!(!x.has_block_data(&(head_block.number() + 1)));
|
|
assert!(!x.has_block_data(&(head_block.number() + 1000)));
|
|
}
|
|
*/
|
|
}
|