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Make sure that an append is indexed before returning a successful res…
…ult (#8) to the user.
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,149 @@ | ||
use std::collections::BTreeMap; | ||
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use eyre::Context; | ||
use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender}; | ||
use tokio::sync::oneshot; | ||
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use geth_common::Record; | ||
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use crate::bus::SubscribeMsg; | ||
use crate::messages::{StreamTarget, SubscribeTo, SubscriptionRequestOutcome, SubscriptionTarget}; | ||
use crate::names; | ||
use crate::process::SubscriptionsClient; | ||
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pub struct Request { | ||
pub position: u64, | ||
pub callback: oneshot::Sender<()>, | ||
} | ||
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pub enum Cmd { | ||
Apply(Record), | ||
Register(Request), | ||
} | ||
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#[derive(Clone)] | ||
pub struct WriteRequestManagerClient { | ||
inner: UnboundedSender<Cmd>, | ||
} | ||
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impl WriteRequestManagerClient { | ||
pub async fn wait_until_indexing_reach(&self, position: u64) -> eyre::Result<()> { | ||
let (callback, recv) = oneshot::channel(); | ||
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self.inner | ||
.send(Cmd::Register(Request { position, callback })) | ||
.wrap_err("write-request manager is unreachable")?; | ||
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recv.await | ||
.wrap_err("unexpected error when waiting append request to be indexed")?; | ||
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Ok(()) | ||
} | ||
} | ||
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pub fn start(sub_client: SubscriptionsClient) -> WriteRequestManagerClient { | ||
let (inner, mailbox) = unbounded_channel(); | ||
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tokio::spawn(indexing_subscription(sub_client, inner.clone())); | ||
tokio::spawn(manager_process(mailbox)); | ||
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WriteRequestManagerClient { inner } | ||
} | ||
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#[derive(Default)] | ||
struct WriteRequestManager { | ||
position: u64, | ||
inner: BTreeMap<u64, Request>, | ||
} | ||
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impl WriteRequestManager { | ||
fn collect_keys(&self, up_to: u64) -> Vec<u64> { | ||
self.inner.range(..=up_to).map(|(k, _)| *k).collect() | ||
} | ||
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pub fn handle(&mut self, cmd: Cmd) { | ||
match cmd { | ||
Cmd::Apply(r) => self.apply(r), | ||
Cmd::Register(req) => self.register(req), | ||
} | ||
} | ||
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fn apply(&mut self, record: Record) { | ||
if record.stream_name != names::streams::SYSTEM | ||
|| record.r#type != names::types::EVENTS_INDEXED | ||
{ | ||
return; | ||
} | ||
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self.position = record.revision; | ||
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for key in self.collect_keys(record.revision) { | ||
if let Some(req) = self.inner.remove(&key) { | ||
let _ = req.callback.send(()); | ||
} | ||
} | ||
} | ||
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fn register(&mut self, request: Request) { | ||
if self.position >= request.position { | ||
let _ = request.callback.send(()); | ||
return; | ||
} | ||
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self.inner.insert(request.position, request); | ||
} | ||
} | ||
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async fn indexing_subscription( | ||
sub_client: SubscriptionsClient, | ||
sender: UnboundedSender<Cmd>, | ||
) -> eyre::Result<()> { | ||
let (mail, resp) = oneshot::channel(); | ||
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sub_client.subscribe(SubscribeMsg { | ||
payload: SubscribeTo { | ||
target: SubscriptionTarget::Stream(StreamTarget { | ||
parent: None, | ||
stream_name: names::streams::SYSTEM.to_string(), | ||
}), | ||
}, | ||
mail, | ||
})?; | ||
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let confirm = resp | ||
.await | ||
.wrap_err("write-request manager is unable to subscribe to $system")?; | ||
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let mut stream = match confirm.outcome { | ||
SubscriptionRequestOutcome::Success(s) => s, | ||
SubscriptionRequestOutcome::Failure(e) => { | ||
tracing::error!( | ||
"write-request manager is unable to subscribe to $system: {}", | ||
e | ||
); | ||
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return Err(e); | ||
} | ||
}; | ||
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while let Some(record) = stream.next().await? { | ||
if sender.send(Cmd::Apply(record)).is_err() { | ||
tracing::error!("unable to communicate with write-request manager process"); | ||
break; | ||
} | ||
} | ||
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tracing::warn!("write-request manager subscription to $system exited"); | ||
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Ok(()) | ||
} | ||
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async fn manager_process(mut mailbox: UnboundedReceiver<Cmd>) { | ||
let mut mgr = WriteRequestManager::default(); | ||
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while let Some(cmd) = mailbox.recv().await { | ||
mgr.handle(cmd); | ||
} | ||
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tracing::warn!("write-request manager process exited") | ||
} |
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