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//! Operator and utilities to source data from the underlying Timely
//! logging streams.
use std::collections::HashMap;
use std::time::Duration;
use timely::communication::message::RefOrMut;
use timely::dataflow::channels::pact::Pipeline;
use timely::dataflow::operators::capture::Replay;
use timely::dataflow::operators::generic::builder_rc::OperatorBuilder;
use timely::dataflow::{Scope, Stream};
use timely::logging::{TimelyEvent, WorkerIdentifier};
use crate::sources::{Sourceable, SourcingContext};
use crate::{Aid, Value};
use crate::{AttributeConfig, InputSemantics};
use Value::{Bool, Eid};
/// One or more taps into Timely logging.
#[derive(Hash, PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct TimelyLogging {
/// The log attributes that should be materialized.
pub attributes: Vec<Aid>,
/// Optionally listen for events from a number of remote workers,
/// rather than introspectively.
pub remote_peers: Option<usize>,
}
impl<S: Scope<Timestamp = Duration>> Sourceable<S> for TimelyLogging {
fn source(
&self,
scope: &mut S,
context: SourcingContext<S::Timestamp>,
) -> Vec<(
Aid,
AttributeConfig,
Stream<S, ((Value, Value), Duration, isize)>,
)> {
let input = match self.remote_peers {
None => {
// Read events introspectively.
Some(context.timely_events).replay_into(scope)
}
Some(source_peers) => {
// Listen for events from a remote computation.
let sockets = open_sockets(source_peers);
make_replayers(sockets, scope.index(), scope.peers()).replay_into(scope)
}
};
let mut demux = OperatorBuilder::new("Timely Logging Demux".to_string(), scope.clone());
let mut input = demux.new_input(&input, Pipeline);
let mut wrappers = HashMap::with_capacity(self.attributes.len());
let mut streams = HashMap::with_capacity(self.attributes.len());
for aid in self.attributes.iter() {
let (wrapper, stream) = demux.new_output();
wrappers.insert(aid.to_string(), wrapper);
streams.insert(aid.to_string(), stream);
}
let mut demux_buffer = Vec::new();
let num_interests = self.attributes.len();
demux.build(move |_capability| {
move |_frontiers| {
let mut handles = HashMap::with_capacity(num_interests);
for (aid, wrapper) in wrappers.iter_mut() {
handles.insert(aid.to_string(), wrapper.activate());
}
input.for_each(|time, data: RefOrMut<Vec<_>>| {
data.swap(&mut demux_buffer);
let mut sessions = HashMap::with_capacity(num_interests);
for (aid, handle) in handles.iter_mut() {
sessions.insert(aid.to_string(), handle.session(&time));
}
for (time, _worker, datum) in demux_buffer.drain(..) {
match datum {
TimelyEvent::Operates(mut x) => {
let eid = Eid((x.id as u64).into());
let name = Value::String(x.name);
// The id of this operator within its scope.
let local_id = Eid((x.addr.pop().unwrap() as u64).into());
if x.addr.is_empty() {
// This is a top-level subgraph and thus lives in the root.
sessions
.get_mut("timely/scope")
.map(|s| s.give(((eid.clone(), Eid(0)), time, 1)));
} else {
// The leaf scope that this operator resides in.
let scope = Eid((x.addr.pop().unwrap() as u64).into());
sessions
.get_mut("timely/scope")
.map(|s| s.give(((eid.clone(), scope.clone()), time, 1)));
if !x.addr.is_empty() {
// This means that there are one or more parent scopes.
// We want to make sure our scope is linked to its parent. But
// we can assume all others are doing the same, so we don't need to
// re-introduce edges for higher-level ancestors.
let parent = Eid((x.addr.pop().unwrap() as u64).into());
sessions
.get_mut("timely/scope")
.map(|s| s.give(((scope, parent), time, 1)));
}
}
sessions
.get_mut("timely.event.operates/local-id")
.map(|s| s.give(((eid.clone(), local_id), time, 1)));
sessions
.get_mut("timely.event.operates/name")
.map(|s| s.give(((eid, name), time, 1)));
}
TimelyEvent::Shutdown(x) => {
let eid = Eid((x.id as u64).into());
sessions
.get_mut("timely.event.operates/shutdown?")
.map(|s| s.give(((eid, Bool(true)), time, 1)));
}
TimelyEvent::Channels(mut x) => {
let eid = Eid((x.id as u64).into());
let src_index = Eid((x.source.0 as u64).into());
let src_port = Eid((x.source.1 as u64).into());
let target_index = Eid((x.target.0 as u64).into());
let target_port = Eid((x.target.1 as u64).into());
// The leaf scope that this channel resides in.
let scope = Eid((x.scope_addr.pop().unwrap() as u64).into());
sessions
.get_mut("timely/scope")
.map(|s| s.give(((eid.clone(), scope.clone()), time, 1)));
sessions
.get_mut("timely.event.channels/src-index")
.map(|s| s.give(((eid.clone(), src_index), time, 1)));
sessions
.get_mut("timely.event.channels/src-port")
.map(|s| s.give(((eid.clone(), src_port), time, 1)));
sessions
.get_mut("timely.event.channels/target-index")
.map(|s| s.give(((eid.clone(), target_index), time, 1)));
sessions
.get_mut("timely.event.channels/target-port")
.map(|s| s.give(((eid, target_port), time, 1)));
}
TimelyEvent::Schedule(x) => {
let eid = Eid((x.id as u64).into());
let is_started =
Bool(x.start_stop == ::timely::logging::StartStop::Start);
sessions
.get_mut("schedule/started?")
.map(|s| s.give(((eid, is_started), time, 1)));
}
TimelyEvent::Messages(_x) => {
// @TODO
// (MessagesChannel, (x.seq_noValue::Usize(x.channel), Value::Bool(x.is_send), Value::Usize(x.source), Value::Usize(x.target), Value::Usize(x.seq_no), Value::Usize(x.length)
}
_ => {}
}
}
});
}
});
self.attributes
.iter()
.map(|aid| {
(
aid.to_string(),
AttributeConfig::real_time(InputSemantics::CardinalityMany),
streams.remove(aid).unwrap(),
)
})
.collect()
}
}
use std::net::{TcpListener, TcpStream};
use std::sync::{Arc, Mutex};
use timely::dataflow::operators::capture::EventReader;
/// Listens on 127.0.0.1:8000 and opens `source_peers` sockets from
/// the computations we're examining.
fn open_sockets(source_peers: usize) -> Arc<Mutex<Vec<Option<TcpStream>>>> {
let listener = TcpListener::bind("127.0.0.1:8000").unwrap();
let sockets = (0..source_peers)
.map(|_| Some(listener.incoming().next().unwrap().unwrap()))
.collect::<Vec<_>>();
Arc::new(Mutex::new(sockets))
}
/// Construct replayers that read data from sockets and can stream it
/// into timely dataflow.
fn make_replayers(
sockets: Arc<Mutex<Vec<Option<TcpStream>>>>,
index: usize,
peers: usize,
) -> Vec<EventReader<Duration, (Duration, WorkerIdentifier, TimelyEvent), TcpStream>> {
sockets
.lock()
.unwrap()
.iter_mut()
.enumerate()
.filter(|(i, _)| *i % peers == index)
.map(move |(_, s)| s.take().unwrap())
.map(|r| EventReader::<Duration, (Duration, WorkerIdentifier, TimelyEvent), _>::new(r))
.collect::<Vec<_>>()
}