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// Copyright (c) 2023 MASSA LABS <info@massa.net>
use crate::error::GrpcError;
use crate::server::MassaPublicGrpc;
use futures_util::StreamExt;
use massa_proto_rs::massa::api::v1::{self as grpc_api};
use std::{pin::Pin, time::Duration};
use tokio::{select, time};
use tonic::{Request, Streaming};
use tracing::error;
use super::trait_filters_impl::{FilterGrpc, FilterNewOperations};
/// Type declaration for NewOperations
pub type NewOperationsStreamType = Pin<
Box<
dyn futures_util::Stream<Item = Result<grpc_api::NewOperationsResponse, tonic::Status>>
+ Send
+ 'static,
>,
>;
/// Type declaration for NewOperations server
pub type NewOperationsServerStreamType = Pin<
Box<
dyn futures_util::Stream<
Item = Result<grpc_api::NewOperationsServerResponse, tonic::Status>,
> + Send
+ 'static,
>,
>;
/// Creates a new stream of new produced and received operations
pub(crate) async fn new_operations(
grpc: &MassaPublicGrpc,
request: Request<Streaming<grpc_api::NewOperationsRequest>>,
) -> Result<NewOperationsStreamType, GrpcError> {
// Create a channel to handle communication with the client
let (tx, rx) = tokio::sync::mpsc::channel(grpc.grpc_config.max_channel_size);
// Get the inner stream from the request
let mut in_stream = request.into_inner();
// Subscribe to the new operations channel
let mut subscriber = grpc.pool_broadcasts.operation_sender.subscribe();
// Clone grpc to be able to use it in the spawned task
// let grpc = grpc.clone();
let config = grpc.grpc_config.clone();
tokio::spawn(async move {
if let Some(Ok(request)) = in_stream.next().await {
// Spawn a new task for sending new operations
let mut filters =
match FilterNewOperations::build_from_request(request.filters, &config) {
Ok(filter) => filter,
Err(err) => {
error!("failed to get filter: {}", err);
// Send the error response back to the client
if let Err(e) = tx.send(Err(err.into())).await {
error!("failed to send back NewOperations error response: {}", e);
}
return;
}
};
loop {
select! {
// Receive a new operation from the subscriber
event = subscriber.recv() => {
match event {
Ok(massa_operation) => {
// Check if the operation should be sent
if let Some(data) = filters.filter_output(massa_operation, &config) {
// Send the new operation through the channel
if let Err(e) = tx.send(Ok(grpc_api::NewOperationsResponse {signed_operation: Some(data.into())})).await {
error!("failed to send operation : {}", e);
break;
}
}
},
Err(e) => error!("{}", e)
}
},
// Receive a new message from the in_stream
res = in_stream.next() => {
match res {
Some(res) => {
match res {
Ok(message) => {
// Update current filter
filters = match FilterNewOperations::build_from_request(message.filters, &config) {
Ok(filter) => filter,
Err(err) => {
error!("failed to get filter: {}", err);
// Send the error response back to the client
if let Err(e) = tx.send(Err(err.into())).await {
error!("failed to send back NewOperations error response: {}", e);
}
return;
}
};
},
Err(e) => {
error!("{}", e);
break;
}
}
},
None => {
// Client disconnected
break;
},
}
}
}
}
} else {
error!("empty request");
}
});
let out_stream = tokio_stream::wrappers::ReceiverStream::new(rx);
Ok(Box::pin(out_stream) as NewOperationsStreamType)
}
/// Creates a new stream of new produced and received operations
/// unidirectional streaming
pub(crate) async fn new_operations_server(
grpc: &MassaPublicGrpc,
request: Request<grpc_api::NewOperationsServerRequest>,
) -> Result<NewOperationsServerStreamType, GrpcError> {
// Create a channel to handle communication with the client
let (tx, rx) = tokio::sync::mpsc::channel(grpc.grpc_config.max_channel_size);
// Get the inner request
let request = request.into_inner();
// Subscribe to the new operations channel
let mut subscriber = grpc.pool_broadcasts.operation_sender.subscribe();
// Clone grpc to be able to use it in the spawned task
let config = grpc.grpc_config.clone();
tokio::spawn(async move {
let filter = match FilterNewOperations::build_from_request(request.filters, &config) {
Ok(filter) => filter,
Err(err) => {
error!("failed to get filter: {}", err);
// Send the error response back to the client
if let Err(e) = tx.send(Err(err.into())).await {
error!("failed to send back NewOperations error response: {}", e);
}
return;
}
};
// Create a timer that ticks every 10 seconds to check if the client is still connected
let mut interval = time::interval(Duration::from_secs(
config.unidirectional_stream_interval_check,
));
// Continuously loop until the stream ends or an error occurs
loop {
select! {
// Receive a new filled block from the subscriber
event = subscriber.recv() => {
match event {
Ok(massa_operation) => {
// Check if the operation should be sent
if let Some(data) = filter.filter_output(massa_operation, &config) {
// Send the new operation through the channel
if let Err(e) = tx
.send(Ok(grpc_api::NewOperationsServerResponse {
signed_operation: Some(data.into()),
}))
.await
{
error!("failed to send operation : {}", e);
break;
}
}
}
Err(e) => error!("error on receive new operation: {}", e)
}
},
// Execute the code block whenever the timer ticks
_ = interval.tick() => {
if tx.is_closed() {
// Client disconnected
break;
}
}
}
}
});
let out_stream = tokio_stream::wrappers::ReceiverStream::new(rx);
Ok(Box::pin(out_stream) as NewOperationsServerStreamType)
}