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use rusoto_kinesis::{KinesisClient, Kinesis, GetShardIteratorInput, GetRecordsOutput, GetRecordsInput};
use rusoto_core::Region;
use futures::task::Context;
use futures::{Poll, Stream, FutureExt};
use past::future::Future as Fut;
use std::{pin::Pin, sync::{Arc, RwLock}};
use std::time::Duration;
use std::ops::Add;
#[derive(Clone)]
pub enum ShardIterator {
TrimHorizon,
Latest,
AtSequenceNumber,
AfterSequenceNumber,
AtTimestamp
}
impl ShardIterator {
fn to_owned(&self) -> String {
match self {
ShardIterator::TrimHorizon => "TRIM_HORIZON".to_owned(),
ShardIterator::Latest => "LATEST".to_owned(),
ShardIterator::AtSequenceNumber => "AT_SEQUENCE_NUMBER".to_owned(),
ShardIterator::AfterSequenceNumber => "AFTER_SEQUENCE_NUMBER".to_owned(),
ShardIterator::AtTimestamp => "AT_TIMESTAMP".to_owned(),
}
}
}
#[derive(Clone)]
pub struct KinesisShard {
stream: String,
pub(crate) shard_id: String,
it: Option<String>,
client: KinesisClient,
timestamp: Option<String>,
running: Arc<RwLock<bool>>,
seq_number: Option<String>,
iterator_type: ShardIterator
}
impl KinesisShard {
pub fn new(region: Region, stream: String, shard_id: String, seq_number: Option<String>, timestamp: Option<String>, iterator_type: ShardIterator, running: Arc<RwLock<bool>>) -> Self {
KinesisShard {
stream,
running,
it: None,
timestamp: timestamp,
shard_id,
seq_number,
iterator_type,
client: KinesisClient::new(region),
}
}
pub fn from_timestamp(region: Region, stream: String, shard_id: String, timestamp: String, running: Arc<RwLock<bool>>) -> Self {
KinesisShard::new(region, stream, shard_id, None, Some(timestamp), ShardIterator::AtTimestamp, running)
}
pub fn from_sequence(region: Region, stream: String, shard_id: String, seq_number: String, running: Arc<RwLock<bool>>) -> Self {
KinesisShard::new(region, stream, shard_id, Some(seq_number), None, ShardIterator::AtSequenceNumber, running)
}
pub fn from_trim_horizon(region: Region, stream: String, shard_id: String, running: Arc<RwLock<bool>>) -> Self {
KinesisShard::new(region, stream, shard_id, None, None, ShardIterator::TrimHorizon, running)
}
pub fn from_latest(region: Region, stream: String, shard_id: String, running: Arc<RwLock<bool>>) -> Self {
KinesisShard::new(region, stream, shard_id, None, None, ShardIterator::Latest, running)
}
fn get_shard_iterator(&mut self, cx: &mut Context<'_>) {
let _ = self.client
.get_shard_iterator(GetShardIteratorInput {
shard_id: self.shard_id.clone(),
shard_iterator_type: self.iterator_type.to_owned(),
starting_sequence_number: self.seq_number.clone(),
stream_name: self.stream.clone(),
timestamp: None,
}).and_then(|it| {
self.it = it.shard_iterator;
cx.waker().wake_by_ref();
past::future::ok(())
}).map_err(|e| {
panic!("Do something here: {}", e);
}).wait();
}
}
impl Stream for KinesisShard {
type Item = GetRecordsOutput;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
if *self.running.read().unwrap() == false {
return Poll::Ready(None)
}
if let Some(it) = &self.it {
let result: Result<GetRecordsOutput, _> = self.client.get_records(GetRecordsInput {
limit: None,
shard_iterator: it.clone(),
}).sync();
if let Ok(records) = result {
self.it = records.next_shard_iterator.clone();
if records.records.len() > 0 {
Poll::Ready(Some(records))
}
else {
let wa = cx.waker().clone();
let delay = std::time::Instant::now().add(Duration::from_millis(500));
let f = tokio::timer::delay(delay)
.map(move |v| {
wa.wake_by_ref();
v
});
tokio::spawn(f);
Poll::Pending
}
}
else {
let wa = cx.waker().clone();
let delay = std::time::Instant::now().add(Duration::from_millis(500));
let f = tokio::timer::delay(delay)
.map(move |v| {
wa.wake_by_ref();
v
});
tokio::spawn(f);
Poll::Pending
}
}
else {
self.get_shard_iterator(cx);
Poll::Pending
}
}
}