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use std::time::Duration;
use async_trait::async_trait;
use futures::StreamExt;
use pubnub_hyper::core::data::{channel, message::Type};
use pubnub_hyper::{Builder, DefaultRuntime, DefaultTransport};
use crate::source::{SimpleSource, SourceError, Timestamper};
use dataflow_types::{sources::PubNubSourceConnector, SourceErrorDetails};
use repr::{Datum, Row};
pub struct PubNubSourceReader {
source_name: String,
connector: PubNubSourceConnector,
}
impl PubNubSourceReader {
pub fn new(source_name: String, connector: PubNubSourceConnector) -> Self {
Self {
source_name,
connector,
}
}
}
#[async_trait]
impl SimpleSource for PubNubSourceReader {
async fn start(mut self, timestamper: &Timestamper) -> Result<(), SourceError> {
let transport = DefaultTransport::new()
.publish_key("")
.subscribe_key(&self.connector.subscribe_key)
.build()
.map_err(|e| SourceError {
source_name: self.source_name.clone(),
error: SourceErrorDetails::FileIO(e.to_string()),
})?;
let mut pubnub = Builder::new()
.transport(transport)
.runtime(DefaultRuntime)
.build();
let channel = self.connector.channel;
let source_name = self.source_name.clone();
let channel: channel::Name = channel.parse().or_else(|_| {
Err(SourceError {
source_name,
error: SourceErrorDetails::FileIO(format!("invalid pubnub channel: {}", channel)),
})
})?;
let source_name = self.source_name.clone();
loop {
let stream = pubnub.subscribe(channel.clone()).await;
tokio::pin!(stream);
while let Some(msg) = stream.next().await {
if msg.message_type == Type::Publish {
let s = msg.json.dump();
let row = Row::pack_slice(&[Datum::String(&s)]);
timestamper.insert(row).await.map_err(|e| SourceError {
source_name: source_name.clone(),
error: SourceErrorDetails::FileIO(e.to_string()),
})?;
}
}
tracing::info!(
"pubnub channel {:?} disconnected. reconnecting",
channel.to_string()
);
tokio::time::sleep(Duration::from_secs(5)).await;
}
}
}