streamweave 0.10.1

Composable, async, stream-first computation in pure Rust
Documentation 
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use std::any::Any;
use std::sync::Arc;
use std::time::Duration;
use streamweave::graph;
use streamweave::graph::Graph;
use streamweave::nodes::sync_node::{SyncConfig, SyncNode};
use tokio::sync::mpsc;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
  // Create channels for external I/O
  let (config_tx, config_rx) = mpsc::channel(1);
  let (in0_tx, in0_rx) = mpsc::channel(5);
  let (in1_tx, in1_rx) = mpsc::channel(5);
  let (in2_tx, in2_rx) = mpsc::channel(5);
  let (output_tx, output_rx) = mpsc::channel::<Arc<dyn Any + Send + Sync>>(10);
  let (error_tx, error_rx) = mpsc::channel::<Arc<dyn Any + Send + Sync>>(10);

  // Create configuration with timeout
  let sync_config = SyncConfig {
    num_inputs: 3,
    timeout: Some(Duration::from_millis(500)), // 500ms timeout
  };

  // Build the graph using the graph! macro
  let mut graph: Graph = graph! {
    sync: SyncNode::new("sync".to_string(), 3),
    graph.configuration => sync.configuration,
    graph.in_0 => sync.in_0,
    graph.in_1 => sync.in_1,
    graph.in_2 => sync.in_2,
    sync.out => graph.output,
    sync.error => graph.error
  };

  // Connect external channels at runtime
  graph.connect_input_channel("configuration", config_rx)?;
  graph.connect_input_channel("in_0", in0_rx)?;
  graph.connect_input_channel("in_1", in1_rx)?;
  graph.connect_input_channel("in_2", in2_rx)?;
  graph.connect_output_channel("output", output_tx)?;
  graph.connect_output_channel("error", error_tx)?;

  println!("✓ Graph built with graph! macro and connected channels");

  // Send configuration and input data to the channels AFTER building
  let _ = config_tx
    .send(Arc::new(sync_config) as Arc<dyn Any + Send + Sync>)
    .await;

  let _ = in0_tx
    .send(Arc::new("data_0".to_string()) as Arc<dyn Any + Send + Sync>)
    .await;
  let _ = in1_tx
    .send(Arc::new(42i32) as Arc<dyn Any + Send + Sync>)
    .await;
  #[allow(clippy::approx_constant)]
  let _ = in2_tx
    .send(Arc::new(3.14f64) as Arc<dyn Any + Send + Sync>)
    .await;

  println!("✓ Data sent to channels");

  // Execute the graph (channels have data now)
  println!("Executing graph...");
  let start = std::time::Instant::now();
  graph
    .execute()
    .await
    .map_err(|e| format!("Graph execution failed: {:?}", e))?;
  println!("✓ Graph execution completed in {:?}", start.elapsed());

  // Drop the transmitters to close the input channels (signals EOF to streams)
  drop(config_tx);
  drop(in0_tx);
  drop(in1_tx);
  drop(in2_tx);

  // Read results from the output channels
  println!("Reading results from output channels...");
  let mut output_count = 0;
  let mut error_count = 0;

  let mut output_rx = output_rx;
  let mut error_rx = error_rx;

  loop {
    let output_result =
      tokio::time::timeout(tokio::time::Duration::from_millis(100), output_rx.recv()).await;
    let error_result =
      tokio::time::timeout(tokio::time::Duration::from_millis(100), error_rx.recv()).await;

    let mut has_data = false;

    if let Ok(Some(item)) = output_result
      && let Ok(vec_arc) = item.downcast::<Vec<Arc<dyn Any + Send + Sync>>>()
    {
      let combined = vec_arc;
      println!("  Synchronized data ({} items):", combined.len());
      for (i, value) in combined.iter().enumerate() {
        if let Ok(string_arc) = value.clone().downcast::<String>() {
          let s = &**string_arc;
          println!("    [{}] {}", i, s);
        } else if let Ok(int_arc) = value.clone().downcast::<i32>() {
          let n = *int_arc;
          println!("    [{}] {}", i, n);
        } else if let Ok(float_arc) = value.clone().downcast::<f64>() {
          let f = *float_arc;
          println!("    [{}] {}", i, f);
        }
      }
      output_count += 1;
      has_data = true;
    }

    if let Ok(Some(item)) = error_result
      && let Ok(error_msg) = item.downcast::<String>()
    {
      let error = &**error_msg;
      println!("  Error: {}", error);
      error_count += 1;
      has_data = true;
    }

    if !has_data {
      break;
    }
  }

  println!(
    "✓ Received {} synchronized outputs via output channel",
    output_count
  );
  println!("✓ Received {} errors via error channel", error_count);
  println!("✓ Total completed in {:?}", start.elapsed());

  Ok(())
}