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* consumer: init * client: subscription * consumer: init test
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,182 @@ | ||
use std::io::Write; | ||
|
||
use flate2::write::GzDecoder; | ||
use hstreamdb_pb::{ | ||
BatchHStreamRecords, BatchedRecord, HStreamRecord, StreamingFetchRequest, | ||
StreamingFetchResponse, | ||
}; | ||
use prost::Message; | ||
use prost_types::Struct; | ||
use tokio::sync::mpsc::error::SendError; | ||
use tokio::sync::mpsc::UnboundedSender; | ||
use tokio_stream::wrappers::UnboundedReceiverStream; | ||
use tonic::{Request, Streaming}; | ||
|
||
use crate::client::Client; | ||
use crate::common::{self, Payload}; | ||
|
||
impl Client { | ||
pub async fn streaming_fetch( | ||
&mut self, | ||
consumer_name: String, | ||
subscription_id: String, | ||
) -> common::Result<UnboundedReceiverStream<(Payload, AckFn)>> { | ||
let request = StreamingFetchRequest { | ||
subscription_id: subscription_id.clone(), | ||
consumer_name: consumer_name.clone(), | ||
ack_ids: Vec::new(), | ||
}; | ||
let (request_sender, request_receiver) = | ||
tokio::sync::mpsc::unbounded_channel::<StreamingFetchRequest>(); | ||
let request_stream = UnboundedReceiverStream::new(request_receiver); | ||
let response = self | ||
.hstream_api_client | ||
.streaming_fetch(Request::new(request_stream)) | ||
.await? | ||
.into_inner(); | ||
request_sender | ||
.send(request) | ||
.map_err(common::Error::StreamingFetchInitError)?; | ||
|
||
let (sender, receiver) = tokio::sync::mpsc::unbounded_channel::<(Payload, AckFn)>(); | ||
|
||
let _ = tokio::spawn(fetching( | ||
consumer_name, | ||
subscription_id, | ||
request_sender, | ||
response, | ||
sender, | ||
)); | ||
|
||
Ok(UnboundedReceiverStream::new(receiver)) | ||
} | ||
} | ||
|
||
async fn fetching( | ||
consumer_name: String, | ||
subscription_id: String, | ||
ack_sender: UnboundedSender<StreamingFetchRequest>, | ||
mut init_response: Streaming<StreamingFetchResponse>, | ||
fetch_stream: UnboundedSender<(Payload, AckFn)>, | ||
) { | ||
loop { | ||
match init_response.message().await { | ||
Err(err) => { | ||
log::error!("streaming fetch error: {err}"); | ||
break; | ||
} | ||
Ok(message) => match message { | ||
None => { | ||
return; | ||
} | ||
Some(message) => process_streaming_fetch_response( | ||
consumer_name.clone(), | ||
subscription_id.clone(), | ||
message, | ||
ack_sender.clone(), | ||
fetch_stream.clone(), | ||
), | ||
}, | ||
} | ||
} | ||
} | ||
|
||
type AckFn = Box<dyn FnOnce() -> Result<(), SendError<StreamingFetchRequest>> + Send>; | ||
|
||
fn process_streaming_fetch_response( | ||
consumer_name: String, | ||
subscription_id: String, | ||
message: StreamingFetchResponse, | ||
ack_sender: UnboundedSender<StreamingFetchRequest>, | ||
fetch_stream: UnboundedSender<(Payload, AckFn)>, | ||
) { | ||
match message.received_records { | ||
None => { | ||
log::warn!("streaming fetch error: failed to unwrap `received_records`"); | ||
} | ||
Some(received_records) => match decode_received_records( | ||
received_records.record, | ||
received_records.record_ids.is_empty(), | ||
) { | ||
Err(err) => { | ||
log::error!("decode received records error: {err}") | ||
} | ||
Ok(records) => { | ||
for (record, record_id) in records.into_iter().zip(received_records.record_ids) { | ||
let record = match record.header { | ||
None => { | ||
log::error!( | ||
"process streaming fetch response error: failed to unwrap record header" | ||
); | ||
return; | ||
} | ||
Some(header) => match header.flag() { | ||
hstreamdb_pb::h_stream_record_header::Flag::Raw => { | ||
Payload::RawRecord(record.payload) | ||
} | ||
hstreamdb_pb::h_stream_record_header::Flag::Json => { | ||
match Struct::decode(record.payload.as_slice()) { | ||
Err(err) => { | ||
log::error!("decode HRecord error: {err}"); | ||
return; | ||
} | ||
Ok(payload) => Payload::HRecord(payload), | ||
} | ||
} | ||
}, | ||
}; | ||
let ack_sender = ack_sender.clone(); | ||
let subscription_id = subscription_id.clone(); | ||
let consumer_name = consumer_name.clone(); | ||
let ack_fn: AckFn = box (move || { | ||
ack_sender.send(StreamingFetchRequest { | ||
subscription_id, | ||
consumer_name, | ||
ack_ids: vec![record_id], | ||
}) | ||
}); | ||
match fetch_stream.send((record, ack_fn)) { | ||
Ok(()) => (), | ||
Err(err) => { | ||
log::error!("send to fetch stream error: {err}") | ||
} | ||
} | ||
} | ||
} | ||
}, | ||
} | ||
} | ||
|
||
fn decode_received_records( | ||
received_records: Option<BatchedRecord>, | ||
is_empty: bool, | ||
) -> Result<Vec<HStreamRecord>, String> { | ||
if is_empty { | ||
Ok(Vec::new()) | ||
} else { | ||
match received_records { | ||
None => { | ||
Err("decode received records error: failed to unwrap batched record".to_string()) | ||
} | ||
Some(record) => { | ||
let compression_type = record.compression_type(); | ||
let payload = { | ||
let payload = record.payload; | ||
match compression_type { | ||
hstreamdb_pb::CompressionType::None => Ok(payload), | ||
hstreamdb_pb::CompressionType::Gzip => { | ||
let mut decoder = GzDecoder::new(Vec::new()); | ||
decoder.write_all(&payload).map_err(|err| err.to_string())?; | ||
decoder.finish().map_err(|err| err.to_string()) | ||
} | ||
} | ||
}?; | ||
|
||
let records = BatchHStreamRecords::decode(payload.as_slice()) | ||
.map_err(|err| err.to_string())? | ||
.records; | ||
Ok(records) | ||
} | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,7 +1,11 @@ | ||
#![feature(try_blocks)] | ||
#![feature(box_syntax)] | ||
|
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pub mod appender; | ||
pub mod client; | ||
pub mod common; | ||
pub mod consumer; | ||
pub mod producer; | ||
pub mod utils; | ||
|
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pub use common::{Error, Record, Result, Stream, Subscription}; |
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