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use std::collections::{HashMap, HashSet, VecDeque};
use std::time::Duration;
use std::time::Instant;
use anyhow::anyhow;
use aws_sdk_kinesis::error::GetRecordsError;
use aws_sdk_kinesis::output::GetRecordsOutput;
use aws_sdk_kinesis::{Client as KinesisClient, SdkError};
use futures::executor::block_on;
use prometheus::core::AtomicI64;
use timely::scheduling::SyncActivator;
use tracing::error;
use dataflow_types::sources::{
encoding::SourceDataEncoding, ExternalSourceConnector, KinesisSourceConnector, MzOffset,
};
use expr::{PartitionId, SourceInstanceId};
use mz_aws_util::kinesis;
use ore::metrics::{DeleteOnDropGauge, GaugeVecExt};
use crate::logging::materialized::Logger;
use crate::source::metrics::{KinesisMetrics, SourceBaseMetrics};
use crate::source::{NextMessage, SourceMessage, SourceReader};
const KINESIS_SHARD_REFRESH_RATE: Duration = Duration::from_secs(60);
pub struct KinesisSourceReader {
kinesis_client: KinesisClient,
stream_name: String,
shard_set: HashMap<String, ShardMetrics>,
shard_queue: VecDeque<(String, Option<String>)>,
last_checked_shards: Instant,
buffered_messages: VecDeque<SourceMessage<Option<Vec<u8>>, Option<Vec<u8>>>>,
processed_message_count: i64,
base_metrics: KinesisMetrics,
}
struct ShardMetrics {
millis_behind_latest: DeleteOnDropGauge<'static, AtomicI64, Vec<String>>,
}
impl ShardMetrics {
fn new(kinesis_metrics: &KinesisMetrics, stream_name: &str, shard_id: &str) -> Self {
Self {
millis_behind_latest: kinesis_metrics
.millis_behind_latest
.get_delete_on_drop_gauge(vec![stream_name.to_string(), shard_id.to_string()]),
}
}
}
impl KinesisSourceReader {
async fn update_shard_information(&mut self) -> Result<(), anyhow::Error> {
let current_shards: HashSet<_> =
kinesis::get_shard_ids(&self.kinesis_client, &self.stream_name)
.await?
.collect();
let known_shards: HashSet<_> = self.shard_set.keys().cloned().collect();
let new_shards = current_shards
.difference(&known_shards)
.map(|shard_id| shard_id.to_owned());
for shard_id in new_shards {
self.shard_set.insert(
shard_id.to_string(),
ShardMetrics::new(&self.base_metrics, &self.stream_name, &shard_id),
);
self.shard_queue.push_back((
shard_id.to_string(),
kinesis::get_shard_iterator(&self.kinesis_client, &self.stream_name, &shard_id)
.await?,
));
}
Ok(())
}
async fn get_records(
&self,
shard_iterator: &str,
) -> Result<GetRecordsOutput, SdkError<GetRecordsError>> {
self.kinesis_client
.get_records()
.shard_iterator(shard_iterator)
.send()
.await
}
}
impl SourceReader for KinesisSourceReader {
type Key = Option<Vec<u8>>;
type Value = Option<Vec<u8>>;
fn new(
_source_name: String,
_source_id: SourceInstanceId,
_worker_id: usize,
_worker_count: usize,
_consumer_activator: SyncActivator,
connector: ExternalSourceConnector,
_restored_offsets: Vec<(PartitionId, Option<MzOffset>)>,
_encoding: SourceDataEncoding,
_: Option<Logger>,
base_metrics: SourceBaseMetrics,
) -> Result<(Self, Option<PartitionId>), anyhow::Error> {
let kc = match connector {
ExternalSourceConnector::Kinesis(kc) => kc,
_ => unreachable!(),
};
let state = block_on(create_state(&base_metrics.kinesis, kc));
match state {
Ok((kinesis_client, stream_name, shard_set, shard_queue)) => Ok((
KinesisSourceReader {
kinesis_client,
shard_queue,
last_checked_shards: Instant::now(),
buffered_messages: VecDeque::new(),
shard_set,
stream_name,
processed_message_count: 0,
base_metrics: base_metrics.kinesis,
},
Some(PartitionId::None),
)),
Err(e) => Err(anyhow!("{}", e)),
}
}
fn get_next_message(&mut self) -> Result<NextMessage<Self::Key, Self::Value>, anyhow::Error> {
assert_eq!(self.shard_queue.len(), self.shard_set.len());
if self.last_checked_shards.elapsed() >= KINESIS_SHARD_REFRESH_RATE {
if let Err(e) = block_on(self.update_shard_information()) {
error!("{:#?}", e);
return Err(anyhow::Error::msg(e.to_string()));
}
self.last_checked_shards = std::time::Instant::now();
}
if let Some(message) = self.buffered_messages.pop_front() {
Ok(NextMessage::Ready(message))
} else {
if let Some((shard_id, mut shard_iterator)) = self.shard_queue.pop_front() {
if let Some(iterator) = &shard_iterator {
let get_records_output = match block_on(self.get_records(&iterator)) {
Ok(output) => {
shard_iterator = output.next_shard_iterator.clone();
if let Some(millis) = output.millis_behind_latest {
self.shard_set
.get(&shard_id)
.unwrap()
.millis_behind_latest
.set(millis);
}
output
}
Err(SdkError::DispatchFailure(e)) => {
error!("{}", e);
self.shard_queue.push_back((shard_id, shard_iterator));
return Ok(NextMessage::TransientDelay);
}
Err(SdkError::ServiceError { err, .. })
if err.is_expired_iterator_exception() =>
{
error!("{}", err);
return Err(anyhow::Error::msg(err));
}
Err(SdkError::ServiceError { err, .. })
if err.is_provisioned_throughput_exceeded_exception() =>
{
self.shard_queue.push_back((shard_id, shard_iterator));
return Ok(NextMessage::Pending);
}
Err(e) => {
error!("{}", e);
return Err(anyhow!("{}", e));
}
};
for record in get_records_output.records.unwrap_or_default() {
let data = record
.data
.map(|blob| blob.into_inner())
.unwrap_or_else(Vec::new);
self.processed_message_count += 1;
let source_message = SourceMessage {
partition: PartitionId::None,
offset: MzOffset {
offset: self.processed_message_count,
},
upstream_time_millis: None,
key: None,
value: Some(data),
};
self.buffered_messages.push_back(source_message);
}
self.shard_queue.push_back((shard_id, shard_iterator));
}
}
Ok(match self.buffered_messages.pop_front() {
Some(message) => NextMessage::Ready(message),
None => NextMessage::Pending,
})
}
}
}
async fn create_state(
base_metrics: &KinesisMetrics,
c: KinesisSourceConnector,
) -> Result<
(
KinesisClient,
String,
HashMap<String, ShardMetrics>,
VecDeque<(String, Option<String>)>,
),
anyhow::Error,
> {
let config = c.aws.load().await;
let kinesis_client = kinesis::client(&config);
let shard_set = kinesis::get_shard_ids(&kinesis_client, &c.stream_name).await?;
let mut shard_queue: VecDeque<(String, Option<String>)> = VecDeque::new();
let mut shard_map = HashMap::new();
for shard_id in shard_set {
shard_queue.push_back((
shard_id.clone(),
kinesis::get_shard_iterator(&kinesis_client, &c.stream_name, &shard_id).await?,
));
shard_map.insert(
shard_id.clone(),
ShardMetrics::new(base_metrics, &c.stream_name, &shard_id),
);
}
Ok((
kinesis_client,
c.stream_name.clone(),
shard_map,
shard_queue,
))
}