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fix: send transaction retry code

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This commit is contained in:
Timo Kösters 2021-04-24 18:01:05 +02:00
parent dd0b2597b7
commit 3dfc245633
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GPG Key ID: 24DA7517711A2BA4
1 changed files with 79 additions and 57 deletions
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132
src/database/sending.rs
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@ -10,7 +10,7 @@ use crate::{
appservice_server, database::pusher, server_server, utils, Database, Error, PduEvent, Result, appservice_server, database::pusher, server_server, utils, Database, Error, PduEvent, Result,
}; };
use federation::transactions::send_transaction_message; use federation::transactions::send_transaction_message;
use log::warn; use log::{error, warn};
use ring::digest; use ring::digest;
use rocket::futures::stream::{FuturesUnordered, StreamExt}; use rocket::futures::stream::{FuturesUnordered, StreamExt};
use ruma::{ use ruma::{
@ -32,10 +32,16 @@ pub enum OutgoingKind {
pub struct Sending { pub struct Sending {
/// The state for a given state hash. /// The state for a given state hash.
pub(super) servernamepduids: sled::Tree, // ServernamePduId = (+ / $)SenderKey / ServerName / UserId + PduId pub(super) servernamepduids: sled::Tree, // ServernamePduId = (+ / $)SenderKey / ServerName / UserId + PduId
pub(super) servercurrentpdus: sled::Tree, // ServerCurrentPdus = (+ / $)ServerName / UserId + PduId (pduid can be empty for reservation) pub(super) servercurrentpdus: sled::Tree, // ServerCurrentPdus = (+ / $)ServerName / UserId + PduId
pub(super) maximum_requests: Arc<Semaphore>, pub(super) maximum_requests: Arc<Semaphore>,
} }
enum TransactionStatus {
Running,
Failed(u32, Instant), // number of times failed, time of last failure
Retrying(u32), // number of times failed
}
impl Sending { impl Sending {
pub fn start_handler(&self, db: &Database) { pub fn start_handler(&self, db: &Database) {
let servernamepduids = self.servernamepduids.clone(); let servernamepduids = self.servernamepduids.clone();
@ -47,8 +53,10 @@ impl Sending {
let mut futures = FuturesUnordered::new(); let mut futures = FuturesUnordered::new();
// Retry requests we could not finish yet // Retry requests we could not finish yet
let mut current_transactions = HashMap::<OutgoingKind, Vec<Vec<u8>>>::new(); let mut subscriber = servernamepduids.watch_prefix(b"");
let mut current_transaction_status = HashMap::<Vec<u8>, TransactionStatus>::new();
let mut initial_transactions = HashMap::<OutgoingKind, Vec<Vec<u8>>>::new();
for (key, outgoing_kind, pdu) in servercurrentpdus for (key, outgoing_kind, pdu) in servercurrentpdus
.iter() .iter()
.filter_map(|r| r.ok()) .filter_map(|r| r.ok())
@ -58,18 +66,15 @@ impl Sending {
.map(|(k, p)| (key, k, p.to_vec())) .map(|(k, p)| (key, k, p.to_vec()))
}) })
{ {
if pdu.is_empty() { let entry = initial_transactions
// Remove old reservation key .entry(outgoing_kind.clone())
servercurrentpdus.remove(key).unwrap();
continue;
}
let entry = current_transactions
.entry(outgoing_kind)
.or_insert_with(Vec::new); .or_insert_with(Vec::new);
if entry.len() > 30 { if entry.len() > 30 {
warn!("Dropping some current pdus because too many were queued. This should not happen."); warn!(
"Dropping some current pdu: {:?} {:?} {:?}",
key, outgoing_kind, pdu
);
servercurrentpdus.remove(key).unwrap(); servercurrentpdus.remove(key).unwrap();
continue; continue;
} }
@ -77,8 +82,7 @@ impl Sending {
entry.push(pdu); entry.push(pdu);
} }
for (outgoing_kind, pdus) in current_transactions { for (outgoing_kind, pdus) in initial_transactions {
// Create new reservation
let mut prefix = match &outgoing_kind { let mut prefix = match &outgoing_kind {
OutgoingKind::Appservice(server) => { OutgoingKind::Appservice(server) => {
let mut p = b"+".to_vec(); let mut p = b"+".to_vec();
@ -99,14 +103,10 @@ impl Sending {
} }
}; };
prefix.push(0xff); prefix.push(0xff);
servercurrentpdus.insert(prefix, &[]).unwrap(); current_transaction_status.insert(prefix, TransactionStatus::Running);
futures.push(Self::handle_event(outgoing_kind.clone(), pdus, &db)); futures.push(Self::handle_event(outgoing_kind.clone(), pdus, &db));
} }
let mut last_failed_try: HashMap<OutgoingKind, (u32, Instant)> = HashMap::new();
let mut subscriber = servernamepduids.watch_prefix(b"");
loop { loop {
select! { select! {
Some(response) = futures.next() => { Some(response) = futures.next() => {
@ -138,11 +138,8 @@ impl Sending {
.keys() .keys()
.filter_map(|r| r.ok()) .filter_map(|r| r.ok())
{ {
// Don't remove reservation yet
if prefix.len() != key.len() {
servercurrentpdus.remove(key).unwrap(); servercurrentpdus.remove(key).unwrap();
} }
}
// Find events that have been added since starting the last request // Find events that have been added since starting the last request
let new_pdus = servernamepduids let new_pdus = servernamepduids
@ -171,8 +168,7 @@ impl Sending {
) )
); );
} else { } else {
servercurrentpdus.remove(&prefix).unwrap(); current_transaction_status.remove(&prefix);
// servercurrentpdus with the prefix should be empty now
} }
} }
Err((outgoing_kind, _)) => { Err((outgoing_kind, _)) => {
@ -198,15 +194,14 @@ impl Sending {
prefix.push(0xff); prefix.push(0xff);
last_failed_try.insert(outgoing_kind.clone(), match last_failed_try.get(&outgoing_kind) { current_transaction_status.entry(prefix).and_modify(|e| *e = match e {
Some(last_failed) => { TransactionStatus::Running => TransactionStatus::Failed(1, Instant::now()),
(last_failed.0+1, Instant::now()) TransactionStatus::Retrying(n) => TransactionStatus::Failed(*n+1, Instant::now()),
TransactionStatus::Failed(_, _) => {
error!("Request that was not even running failed?!");
return
}, },
None => {
(1, Instant::now())
}
}); });
servercurrentpdus.remove(&prefix).unwrap();
} }
}; };
}, },
@ -220,24 +215,12 @@ impl Sending {
let servernamepduid = key.clone(); let servernamepduid = key.clone();
let exponential_backoff = |(tries, instant): &(u32, Instant)| { let mut retry = false;
// Fail if a request has failed recently (exponential backoff)
let mut min_elapsed_duration = Duration::from_secs(30) * (*tries) * (*tries);
if min_elapsed_duration > Duration::from_secs(60*60*24) {
min_elapsed_duration = Duration::from_secs(60*60*24);
}
instant.elapsed() < min_elapsed_duration if let Some((outgoing_kind, prefix, pdu_id)) = Self::parse_servercurrentpdus(&servernamepduid)
};
if let Some((outgoing_kind, pdu_id)) = Self::parse_servercurrentpdus(&servernamepduid)
.ok() .ok()
.filter(|(outgoing_kind, _)| { .map(|(outgoing_kind, pdu_id)| {
if last_failed_try.get(outgoing_kind).map_or(false, exponential_backoff) { let mut prefix = match &outgoing_kind {
return false;
}
let mut prefix = match outgoing_kind {
OutgoingKind::Appservice(serv) => { OutgoingKind::Appservice(serv) => {
let mut p = b"+".to_vec(); let mut p = b"+".to_vec();
p.extend_from_slice(serv.as_bytes()); p.extend_from_slice(serv.as_bytes());
@ -258,20 +241,59 @@ impl Sending {
}; };
prefix.push(0xff); prefix.push(0xff);
servercurrentpdus (outgoing_kind, prefix, pdu_id)
.compare_and_swap(prefix, Option::<&[u8]>::None, Some(&[])) // Try to reserve })
== Ok(Ok(())) .filter(|(_, prefix, _)| {
let entry = current_transaction_status.entry(prefix.clone());
let mut allow = true;
entry.and_modify(|e| match e {
TransactionStatus::Running | TransactionStatus::Retrying(_) => {
allow = false; // already running
},
TransactionStatus::Failed(tries, time) => {
// Fail if a request has failed recently (exponential backoff)
let mut min_elapsed_duration = Duration::from_secs(30) * (*tries) * (*tries);
if min_elapsed_duration > Duration::from_secs(60*60*24) {
min_elapsed_duration = Duration::from_secs(60*60*24);
}
if time.elapsed() < min_elapsed_duration {
allow = false;
} else {
retry = true;
*e = TransactionStatus::Retrying(*tries);
}
}
}).or_insert(TransactionStatus::Running);
allow
}) })
{ {
let mut pdus = Vec::new();
if retry {
// We retry the previous transaction
for pdu in servercurrentpdus
.scan_prefix(&prefix)
.filter_map(|r| r.ok())
.filter_map(|(key, _)| {
Self::parse_servercurrentpdus(&key)
.ok()
.map(|(_, p)| p.to_vec())
})
{
pdus.push(pdu);
}
} else {
servercurrentpdus.insert(&key, &[]).unwrap(); servercurrentpdus.insert(&key, &[]).unwrap();
servernamepduids.remove(&key).unwrap(); servernamepduids.remove(&key).unwrap();
pdus.push(pdu_id.to_vec());
last_failed_try.remove(&outgoing_kind); }
futures.push( futures.push(
Self::handle_event( Self::handle_event(
outgoing_kind, outgoing_kind,
vec![pdu_id.to_vec()], pdus,
&db, &db,
) )
); );
@ -342,7 +364,7 @@ impl Sending {
( (
server.clone(), server.clone(),
Error::bad_database( Error::bad_database(
"[Appservice] Event in servernamepduids not found in ", "[Appservice] Event in servernamepduids not found in db.",
), ),
) )
})? })?