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Merge branch 'timer-retry' into 'next' 

make federation retry timer-based

Closes #142 and #135

See merge request famedly/conduit!181
merge-requests/181/merge
Jonathan de Jong 2 months ago
parent
98e2bedaaf df902ebd72
commit
affd995c7f
3 changed files with 279 additions and 103 deletions
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  1. 23
      src/database/key_value/sending.rs
  2. 14
      src/service/sending/data.rs
  3. 345
      src/service/sending/mod.rs

23
src/database/key_value/sending.rs
Unescape View File

@ -4,7 +4,7 @@ use crate::{
database::KeyValueDatabase,
service::{
self,
sending::{OutgoingKind, SendingEventType},
sending::{OutgoingDestination, SendingEventType},
},
services, utils, Error, Result,
};
@ -12,7 +12,8 @@ use crate::{
impl service::sending::Data for KeyValueDatabase {
fn active_requests<'a>(
&'a self,
) -> Box<dyn Iterator<Item = Result<(Vec<u8>, OutgoingKind, SendingEventType)>> + 'a> {
) -> Box<dyn Iterator<Item = Result<(Vec<u8>, OutgoingDestination, SendingEventType)>> + 'a>
{
Box::new(
self.servercurrentevent_data
.iter()
@ -22,7 +23,7 @@ impl service::sending::Data for KeyValueDatabase {
fn active_requests_for<'a>(
&'a self,
outgoing_kind: &OutgoingKind,
outgoing_kind: &OutgoingDestination,
) -> Box<dyn Iterator<Item = Result<(Vec<u8>, SendingEventType)>> + 'a> {
let prefix = outgoing_kind.get_prefix();
Box::new(
@ -36,7 +37,7 @@ impl service::sending::Data for KeyValueDatabase {
self.servercurrentevent_data.remove(&key)
}
fn delete_all_active_requests_for(&self, outgoing_kind: &OutgoingKind) -> Result<()> {
fn delete_all_active_requests_for(&self, outgoing_kind: &OutgoingDestination) -> Result<()> {
let prefix = outgoing_kind.get_prefix();
for (key, _) in self.servercurrentevent_data.scan_prefix(prefix) {
self.servercurrentevent_data.remove(&key)?;
@ -45,7 +46,7 @@ impl service::sending::Data for KeyValueDatabase {
Ok(())
}
fn delete_all_requests_for(&self, outgoing_kind: &OutgoingKind) -> Result<()> {
fn delete_all_requests_for(&self, outgoing_kind: &OutgoingDestination) -> Result<()> {
let prefix = outgoing_kind.get_prefix();
for (key, _) in self.servercurrentevent_data.scan_prefix(prefix.clone()) {
self.servercurrentevent_data.remove(&key).unwrap();
@ -60,7 +61,7 @@ impl service::sending::Data for KeyValueDatabase {
fn queue_requests(
&self,
requests: &[(&OutgoingKind, SendingEventType)],
requests: &[(&OutgoingDestination, SendingEventType)],
) -> Result<Vec<Vec<u8>>> {
let mut batch = Vec::new();
let mut keys = Vec::new();
@ -86,7 +87,7 @@ impl service::sending::Data for KeyValueDatabase {
fn queued_requests<'a>(
&'a self,
outgoing_kind: &OutgoingKind,
outgoing_kind: &OutgoingDestination,
) -> Box<dyn Iterator<Item = Result<(SendingEventType, Vec<u8>)>> + 'a> {
let prefix = outgoing_kind.get_prefix();
Box::new(
@ -129,7 +130,7 @@ impl service::sending::Data for KeyValueDatabase {
fn parse_servercurrentevent(
key: &[u8],
value: Vec<u8>,
) -> Result<(OutgoingKind, SendingEventType)> {
) -> Result<(OutgoingDestination, SendingEventType)> {
// Appservices start with a plus
Ok::<_, Error>(if key.starts_with(b"+") {
let mut parts = key[1..].splitn(2, |&b| b == 0xff);
@ -144,7 +145,7 @@ fn parse_servercurrentevent(
})?;
(
OutgoingKind::Appservice(server),
OutgoingDestination::Appservice(server),
if value.is_empty() {
SendingEventType::Pdu(event.to_vec())
} else {
@ -171,7 +172,7 @@ fn parse_servercurrentevent(
.ok_or_else(|| Error::bad_database("Invalid bytes in servercurrentpdus."))?;
(
OutgoingKind::Push(user_id, pushkey_string),
OutgoingDestination::Push(user_id, pushkey_string),
if value.is_empty() {
SendingEventType::Pdu(event.to_vec())
} else {
@ -192,7 +193,7 @@ fn parse_servercurrentevent(
})?;
(
OutgoingKind::Normal(ServerName::parse(server).map_err(|_| {
OutgoingDestination::Normal(ServerName::parse(server).map_err(|_| {
Error::bad_database("Invalid server string in server_currenttransaction")
})?),
if value.is_empty() {

14
src/service/sending/data.rs
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@ -2,27 +2,27 @@ use ruma::ServerName;
use crate::Result;
use super::{OutgoingKind, SendingEventType};
use super::{OutgoingDestination, SendingEventType};
pub trait Data: Send + Sync {
#[allow(clippy::type_complexity)]
fn active_requests<'a>(
&'a self,
) -> Box<dyn Iterator<Item = Result<(Vec<u8>, OutgoingKind, SendingEventType)>> + 'a>;
) -> Box<dyn Iterator<Item = Result<(Vec<u8>, OutgoingDestination, SendingEventType)>> + 'a>;
fn active_requests_for<'a>(
&'a self,
outgoing_kind: &OutgoingKind,
outgoing_kind: &OutgoingDestination,
) -> Box<dyn Iterator<Item = Result<(Vec<u8>, SendingEventType)>> + 'a>;
fn delete_active_request(&self, key: Vec<u8>) -> Result<()>;
fn delete_all_active_requests_for(&self, outgoing_kind: &OutgoingKind) -> Result<()>;
fn delete_all_requests_for(&self, outgoing_kind: &OutgoingKind) -> Result<()>;
fn delete_all_active_requests_for(&self, outgoing_kind: &OutgoingDestination) -> Result<()>;
fn delete_all_requests_for(&self, outgoing_kind: &OutgoingDestination) -> Result<()>;
fn queue_requests(
&self,
requests: &[(&OutgoingKind, SendingEventType)],
requests: &[(&OutgoingDestination, SendingEventType)],
) -> Result<Vec<Vec<u8>>>;
fn queued_requests<'a>(
&'a self,
outgoing_kind: &OutgoingKind,
outgoing_kind: &OutgoingDestination,
) -> Box<dyn Iterator<Item = Result<(SendingEventType, Vec<u8>)>> + 'a>;
fn mark_as_active(&self, events: &[(SendingEventType, Vec<u8>)]) -> Result<()>;
fn set_latest_educount(&self, server_name: &ServerName, educount: u64) -> Result<()>;

345
src/service/sending/mod.rs
Unescape View File

@ -3,8 +3,9 @@ mod data;
pub use data::Data;
use std::{
collections::{BTreeMap, HashMap, HashSet},
collections::{hash_map::Entry, BTreeMap, HashMap, HashSet},
fmt::Debug,
future::Future,
sync::Arc,
time::{Duration, Instant},
};
@ -40,34 +41,34 @@ use ruma::{
};
use tokio::{
select,
sync::{mpsc, Mutex, Semaphore},
sync::{mpsc, oneshot, Mutex, Semaphore},
};
use tracing::{debug, error, warn};
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum OutgoingKind {
pub enum OutgoingDestination {
Appservice(String),
Push(OwnedUserId, String), // user and pushkey
Normal(OwnedServerName),
}
impl OutgoingKind {
impl OutgoingDestination {
#[tracing::instrument(skip(self))]
pub fn get_prefix(&self) -> Vec<u8> {
let mut prefix = match self {
OutgoingKind::Appservice(server) => {
OutgoingDestination::Appservice(server) => {
let mut p = b"+".to_vec();
p.extend_from_slice(server.as_bytes());
p
}
OutgoingKind::Push(user, pushkey) => {
OutgoingDestination::Push(user, pushkey) => {
let mut p = b"$".to_vec();
p.extend_from_slice(user.as_bytes());
p.push(0xff);
p.extend_from_slice(pushkey.as_bytes());
p
}
OutgoingKind::Normal(server) => {
OutgoingDestination::Normal(server) => {
let mut p = Vec::new();
p.extend_from_slice(server.as_bytes());
p
@ -77,6 +78,47 @@ impl OutgoingKind {
prefix
}
// This wraps the OutgoingDestination key in an interruptible sleep future.
//
// The first return value is the future, the second is the oneshot that interrupts that future,
// and causes it to return instantly.
fn wrap_in_interruptible_sleep(
self,
at: Instant,
) -> (impl Future<Output = Self>, oneshot::Sender<()>) {
let (tx, rx) = oneshot::channel();
let at = tokio::time::Instant::from_std(at);
(
async move {
let _ = tokio::time::timeout_at(at, rx).await;
self
},
tx,
)
}
}
impl std::fmt::Display for OutgoingDestination {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
OutgoingDestination::Appservice(appservice_id) => {
write!(f, "Appservice (ID {:?})", appservice_id)
}
OutgoingDestination::Push(user, push_key) => {
write!(
f,
"User Push Service (for {:?}, with key {:?})",
user, push_key
)
}
OutgoingDestination::Normal(server) => {
write!(f, "Matrix Server ({:?})", server)
}
}
}
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
@ -90,14 +132,29 @@ pub struct Service {
/// The state for a given state hash.
pub(super) maximum_requests: Arc<Semaphore>,
pub sender: mpsc::UnboundedSender<(OutgoingKind, SendingEventType, Vec<u8>)>,
receiver: Mutex<mpsc::UnboundedReceiver<(OutgoingKind, SendingEventType, Vec<u8>)>>,
pub sender: mpsc::UnboundedSender<(OutgoingDestination, SendingEventType, Vec<u8>)>,
receiver: Mutex<mpsc::UnboundedReceiver<(OutgoingDestination, SendingEventType, Vec<u8>)>>,
}
enum TransactionStatus {
// Currently running (for the first time)
Running,
Failed(u32, Instant), // number of times failed, time of last failure
Retrying(u32), // number of times failed
// Failed, backing off for a retry
Failed {
failures: u32,
waker: Option<oneshot::Sender<()>>,
},
// Currently retrying
Retrying {
failures: u32,
}, // number of times failed
}
// A control-flow enum to dictate what the handler should do after (trying to) prepare a transaction
enum TransactionPrepOutcome {
Send(Vec<SendingEventType>),
Wake(OutgoingDestination),
Nothing,
}
impl Service {
@ -119,14 +176,17 @@ impl Service {
}
async fn handler(&self) -> Result<()> {
let mut receiver = self.receiver.lock().await;
let mut new_transactions = self.receiver.lock().await;
let (waking_sender, mut waking_receiver) = mpsc::unbounded_channel();
let mut futures = FuturesUnordered::new();
let mut outgoing = FuturesUnordered::new();
let mut retrying = FuturesUnordered::new();
let mut current_transaction_status = HashMap::<OutgoingKind, TransactionStatus>::new();
let mut current_transaction_status =
HashMap::<OutgoingDestination, TransactionStatus>::new();
// Retry requests we could not finish yet
let mut initial_transactions = HashMap::<OutgoingKind, Vec<SendingEventType>>::new();
let mut initial_transactions = HashMap::<OutgoingDestination, Vec<SendingEventType>>::new();
for (key, outgoing_kind, event) in self.db.active_requests().filter_map(|r| r.ok()) {
let entry = initial_transactions
@ -147,12 +207,34 @@ impl Service {
for (outgoing_kind, events) in initial_transactions {
current_transaction_status.insert(outgoing_kind.clone(), TransactionStatus::Running);
futures.push(Self::handle_events(outgoing_kind.clone(), events));
outgoing.push(Self::handle_events(outgoing_kind.clone(), events));
}
loop {
select! {
Some(response) = futures.next() => {
// New transactions to be sent out (from server/user activity)
Some((dest, event, key)) = new_transactions.recv() => {
match self.prepare_transaction(
&dest,
vec![(event, key)],
&mut current_transaction_status,
true,
) {
Ok(TransactionPrepOutcome::Send(events)) => {
outgoing.push(Self::handle_events(dest, events));
},
Ok(TransactionPrepOutcome::Wake(dest)) => {
waking_sender.send(dest).expect("nothing closes this channel but ourselves");
},
Ok(TransactionPrepOutcome::Nothing) => {},
Err(err) => {
error!("Ignoring error in (fresh) outgoing request ({}) handler: {}", dest, err)
}
}
},
Some(response) = outgoing.next() => {
// Outgoing transaction succeeded
match response {
Ok(outgoing_kind) => {
self.db.delete_all_active_requests_for(&outgoing_kind)?;
@ -164,9 +246,12 @@ impl Service {
// Insert pdus we found
self.db.mark_as_active(&new_events)?;
futures.push(
// Clear retries
current_transaction_status.insert(outgoing_kind.clone(), TransactionStatus::Running);
outgoing.push(
Self::handle_events(
outgoing_kind.clone(),
outgoing_kind,
new_events.into_iter().map(|(event, _)| event).collect(),
)
);
@ -174,72 +259,160 @@ impl Service {
current_transaction_status.remove(&outgoing_kind);
}
}
Err((outgoing_kind, _)) => {
current_transaction_status.entry(outgoing_kind).and_modify(|e| *e = match e {
TransactionStatus::Running => TransactionStatus::Failed(1, Instant::now()),
TransactionStatus::Retrying(n) => TransactionStatus::Failed(*n+1, Instant::now()),
TransactionStatus::Failed(_, _) => {
error!("Request that was not even running failed?!");
return
},
});
// Outgoing transaction failed
Err((destination, err)) => {
// Set status to Failed, create timer
let timer = Self::mark_failed_and_backoff(&mut current_transaction_status, destination.clone());
// Add timer to loop
retrying.push(timer);
warn!("Outgoing request to {} failed: {}", destination, err);
}
};
},
Some((outgoing_kind, event, key)) = receiver.recv() => {
if let Ok(Some(events)) = self.select_events(
&outgoing_kind,
vec![(event, key)],
// Transaction retry timers firing
Some(dest) = retrying.next() => {
// Transition Failed => Retrying, return pending old transaction events
match self.prepare_transaction(
&dest,
vec![], // will be ignored because fresh == false
&mut current_transaction_status,
false,
) {
futures.push(Self::handle_events(outgoing_kind, events));
Ok(TransactionPrepOutcome::Send(events)) => {
outgoing.push(Self::handle_events(dest, events));
}
Ok(_) => {
// Unreachable because fresh == false
unreachable!("prepare_transaction on a stale transaction {} did not return ::Send", dest)
}
Err(err) => {
error!("Ignoring error in (stale) outgoing request ({}) handler: {}", dest, err);
// transaction dropped, so drop destination as well.
current_transaction_status.remove(&dest);
}
}
}
},
// Explicit wakeups, makes a backoff timer return immediately
Some(outgoing) = waking_receiver.recv() => {
if let Some(TransactionStatus::Failed { waker, .. }) = current_transaction_status.get_mut(&outgoing) {
if let Some(waker) = waker.take() {
let _ = waker.send(());
}
}
},
}
}
}
/// Generates timer/oneshot, alters status to reflect Failed
///
/// Returns timer/oneshot future to wake up loop for next retry
fn mark_failed_and_backoff(
status: &mut HashMap<OutgoingDestination, TransactionStatus>,
dest: OutgoingDestination,
) -> impl Future<Output = OutgoingDestination> {
let now = Instant::now();
let entry = status
.get_mut(&dest)
.expect("guaranteed to be set before this function");
let failures = match entry {
// Running -> Failed
TransactionStatus::Running => 1,
// Retrying -> Failed
TransactionStatus::Retrying { failures } => *failures + 1,
// The transition of Failed -> Retrying is handled by handle_events
TransactionStatus::Failed { .. } => {
unreachable!("TransactionStatus in inconsistent state: Expected either Running or Retrying, got Failed, bailing...")
}
};
const ONE_DAY: Duration = Duration::from_secs(60 * 60 * 24);
// Exponential backoff, clamp upper value to one day
let next_wakeup = now + (Duration::from_secs(30) * failures * failures).min(ONE_DAY);
let (fut, waker) = dest.wrap_in_interruptible_sleep(next_wakeup);
*entry = TransactionStatus::Failed {
failures,
waker: Some(waker),
};
fut
}
// This prepares a transaction, checks the transaction state, and selects appropriate events.
#[tracing::instrument(skip(self, outgoing_kind, new_events, current_transaction_status))]
fn select_events(
fn prepare_transaction(
&self,
outgoing_kind: &OutgoingKind,
outgoing_kind: &OutgoingDestination,
new_events: Vec<(SendingEventType, Vec<u8>)>, // Events we want to send: event and full key
current_transaction_status: &mut HashMap<OutgoingKind, TransactionStatus>,
) -> Result<Option<Vec<SendingEventType>>> {
let mut retry = false;
let mut allow = true;
current_transaction_status: &mut HashMap<OutgoingDestination, TransactionStatus>,
fresh: bool, // Wether or not this transaction came from server activity.
) -> Result<TransactionPrepOutcome> {
let mut allowed = true;
let mut retrying = false;
let mut wake_up = false;
let entry = current_transaction_status.entry(outgoing_kind.clone());
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 fresh {
// If its fresh, we initialise the status if we need to.
//
// We do nothing if it is already running or retrying.
//
// We return with a wake if it is in the Failed state.
entry
.and_modify(|e| match e {
TransactionStatus::Running | TransactionStatus::Retrying { .. } => {
// already running
allowed = false;
}
if time.elapsed() < min_elapsed_duration {
allow = false;
} else {
retry = true;
*e = TransactionStatus::Retrying(*tries);
TransactionStatus::Failed { .. } => {
// Currently sleeping, time to call the kool-aid man
wake_up = true;
}
}
})
.or_insert(TransactionStatus::Running);
})
.or_insert(TransactionStatus::Running);
} else {
// If it's not fresh, we expect an entry.
//
// We also expect us to be the only one who are touching this destination right now, and its a stale transaction, so it must be in the Failed state
match entry {
Entry::Occupied(mut e) => {
let e = e.get_mut();
match e {
TransactionStatus::Failed { failures, .. } => {
*e = TransactionStatus::Retrying { failures: *failures };
retrying = true;
},
_ => unreachable!("Encountered bad state when preparing stale transaction: expected Failed state, got Running or Retrying")
}
},
Entry::Vacant(_) => unreachable!("Encountered bad state when preparing stale transaction: expected Failed state, got vacant state"),
}
}
if !allow {
return Ok(None);
if wake_up {
return Ok(TransactionPrepOutcome::Wake(outgoing_kind.clone()));
} else if !allowed {
return Ok(TransactionPrepOutcome::Nothing);
}
let mut events = Vec::new();
if retry {
if retrying {
// We retry the previous transaction
for (_, e) in self
.db
@ -254,7 +427,7 @@ impl Service {
events.push(e);
}
if let OutgoingKind::Normal(server_name) = outgoing_kind {
if let OutgoingDestination::Normal(server_name) = outgoing_kind {
if let Ok((select_edus, last_count)) = self.select_edus(server_name) {
events.extend(select_edus.into_iter().map(SendingEventType::Edu));
@ -263,7 +436,7 @@ impl Service {
}
}
Ok(Some(events))
Ok(TransactionPrepOutcome::Send(events))
}
#[tracing::instrument(skip(self, server_name))]
@ -371,7 +544,7 @@ impl Service {
#[tracing::instrument(skip(self, pdu_id, user, pushkey))]
pub fn send_push_pdu(&self, pdu_id: &[u8], user: &UserId, pushkey: String) -> Result<()> {
let outgoing_kind = OutgoingKind::Push(user.to_owned(), pushkey);
let outgoing_kind = OutgoingDestination::Push(user.to_owned(), pushkey);
let event = SendingEventType::Pdu(pdu_id.to_owned());
let keys = self.db.queue_requests(&[(&outgoing_kind, event.clone())])?;
self.sender
@ -391,7 +564,7 @@ impl Service {
.into_iter()
.map(|server| {
(
OutgoingKind::Normal(server),
OutgoingDestination::Normal(server),
SendingEventType::Pdu(pdu_id.to_owned()),
)
})
@ -418,7 +591,7 @@ impl Service {
serialized: Vec<u8>,
id: u64,
) -> Result<()> {
let outgoing_kind = OutgoingKind::Normal(server.to_owned());
let outgoing_kind = OutgoingDestination::Normal(server.to_owned());
let event = SendingEventType::Edu(serialized);
let keys = self.db.queue_requests(&[(&outgoing_kind, event.clone())])?;
self.sender
@ -430,7 +603,7 @@ impl Service {
#[tracing::instrument(skip(self))]
pub fn send_pdu_appservice(&self, appservice_id: String, pdu_id: Vec<u8>) -> Result<()> {
let outgoing_kind = OutgoingKind::Appservice(appservice_id);
let outgoing_kind = OutgoingDestination::Appservice(appservice_id);
let event = SendingEventType::Pdu(pdu_id);
let keys = self.db.queue_requests(&[(&outgoing_kind, event.clone())])?;
self.sender
@ -446,18 +619,18 @@ impl Service {
#[tracing::instrument(skip(self))]
pub fn cleanup_events(&self, appservice_id: String) -> Result<()> {
self.db
.delete_all_requests_for(&OutgoingKind::Appservice(appservice_id))?;
.delete_all_requests_for(&OutgoingDestination::Appservice(appservice_id))?;
Ok(())
}
#[tracing::instrument(skip(events, kind))]
async fn handle_events(
kind: OutgoingKind,
kind: OutgoingDestination,
events: Vec<SendingEventType>,
) -> Result<OutgoingKind, (OutgoingKind, Error)> {
) -> Result<OutgoingDestination, (OutgoingDestination, Error)> {
match &kind {
OutgoingKind::Appservice(id) => {
OutgoingDestination::Appservice(id) => {
let mut pdu_jsons = Vec::new();
for event in &events {
@ -522,7 +695,7 @@ impl Service {
response
}
OutgoingKind::Push(userid, pushkey) => {
OutgoingDestination::Push(userid, pushkey) => {
let mut pdus = Vec::new();
for event in &events {
@ -561,14 +734,16 @@ impl Service {
}
}
let pusher = match services()
.pusher
.get_pusher(userid, pushkey)
.map_err(|e| (OutgoingKind::Push(userid.clone(), pushkey.clone()), e))?
{
Some(pusher) => pusher,
None => continue,
};
let pusher =
match services().pusher.get_pusher(userid, pushkey).map_err(|e| {
(
OutgoingDestination::Push(userid.clone(), pushkey.clone()),
e,
)
})? {
Some(pusher) => pusher,
None => continue,
};
let rules_for_user = services()
.account_data
@ -601,9 +776,9 @@ impl Service {
drop(permit);
}
Ok(OutgoingKind::Push(userid.clone(), pushkey.clone()))
Ok(OutgoingDestination::Push(userid.clone(), pushkey.clone()))
}
OutgoingKind::Normal(server) => {
OutgoingDestination::Normal(server) => {
let mut edu_jsons = Vec::new();
let mut pdu_jsons = Vec::new();
@ -615,11 +790,11 @@ impl Service {
services().rooms
.timeline
.get_pdu_json_from_id(pdu_id)
.map_err(|e| (OutgoingKind::Normal(server.clone()), e))?
.map_err(|e| (OutgoingDestination::Normal(server.clone()), e))?
.ok_or_else(|| {
error!("event not found: {server} {pdu_id:?}");
(
OutgoingKind::Normal(server.clone()),
OutgoingDestination::Normal(server.clone()),
Error::bad_database(
"[Normal] Event in servernamevent_data not found in db.",
),

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