kinetic/transforms/wasm/
task.rs

1//! WASM transform task implementation
2
3use super::runtime::{HotSwapConfig, WasmRuntime};
4use crate::transforms::Transform;
5use async_trait::async_trait;
6use kinetic_buffers::{BufferReceiver, BufferSender};
7use kinetic_config::model::{ErrorPolicy, MapTransformConfigWrapped};
8use std::collections::HashMap;
9use std::sync::Arc;
10use tokio::sync::RwLock;
11
12/// Performance statistics for a transform
13#[derive(Debug, Default)]
14pub struct TransformPerfStats {
15    /// Total batches processed
16    pub total_batches: u64,
17    /// Total events processed
18    pub total_events: u64,
19    /// Cumulative WASM execution time in milliseconds
20    pub wasm_execution_time_ms: u64,
21    /// Cumulative fuel consumed
22    pub wasm_fuel_consumed: u64,
23    /// Average batch size
24    pub avg_batch_size: f64,
25    /// Error count
26    pub error_count: u64,
27    /// Last module swap timestamp
28    pub last_module_swap: Option<std::time::Instant>,
29}
30
31/// WASM-based transform task
32pub struct WasmTransformTask {
33    /// Transform configuration
34    pub config: MapTransformConfigWrapped,
35    /// Input receivers
36    pub inputs: Vec<BufferReceiver>,
37    /// Output senders (name -> sender)
38    pub senders: HashMap<String, BufferSender>,
39    /// WASM runtime
40    pub runtime: WasmRuntime,
41    /// Hot-swap configuration
42    pub hotswap_config: HotSwapConfig,
43    /// Performance statistics
44    pub perf_stats: Arc<RwLock<TransformPerfStats>>,
45    /// Error policy
46    pub error_policy: ErrorPolicy,
47}
48
49#[allow(dead_code)]
50impl WasmTransformTask {
51    /// Create a new WASM transform task
52    pub fn new(
53        config: MapTransformConfigWrapped,
54        inputs: Vec<BufferReceiver>,
55        senders: HashMap<String, BufferSender>,
56        runtime: WasmRuntime,
57    ) -> Self {
58        // TODO: Extract hotswap config from config when available
59        let hotswap_config = HotSwapConfig::default();
60
61        Self {
62            config,
63            inputs,
64            senders,
65            runtime,
66            hotswap_config,
67            perf_stats: Arc::new(RwLock::new(TransformPerfStats::default())),
68            error_policy: ErrorPolicy::DropOnError,
69        }
70    }
71
72    /// Get current performance stats
73    pub async fn get_perf_stats(&self) -> TransformPerfStats {
74        self.perf_stats.read().await.clone()
75    }
76
77    /// Update performance stats
78    async fn record_batch_processed(
79        &self,
80        batch_size: usize,
81        execution_ms: u64,
82        fuel_consumed: u64,
83    ) {
84        let mut stats = self.perf_stats.write().await;
85        stats.total_batches += 1;
86        stats.total_events += batch_size as u64;
87        stats.wasm_execution_time_ms += execution_ms;
88        stats.wasm_fuel_consumed += fuel_consumed;
89
90        // Update rolling average
91        let n = stats.total_batches as f64;
92        stats.avg_batch_size = ((n - 1.0) * stats.avg_batch_size + batch_size as f64) / n;
93    }
94
95    /// Record an error
96    async fn record_error(&self) {
97        let mut stats = self.perf_stats.write().await;
98        stats.error_count += 1;
99    }
100}
101
102#[async_trait]
103impl Transform for WasmTransformTask {
104    async fn run(self: Box<Self>) {
105        // TODO: Implement full WASM transform loop
106        // 1. Receive batch from input
107        // 2. Serialize to Arrow IPC
108        // 3. Call WASM transform()
109        // 4. Deserialize output
110        // 5. Route to appropriate output
111        // 6. Handle errors per error_policy
112        // 7. Update metrics
113
114        tracing::info!("WASM transform task started: {:?}", self.config);
115
116        // Placeholder: just drain inputs for now
117        for mut rx in self.inputs {
118            while let Some(_batch) = rx.recv().await {
119                // TODO: Process batch
120            }
121        }
122    }
123}
124
125impl Clone for TransformPerfStats {
126    fn clone(&self) -> Self {
127        Self {
128            total_batches: self.total_batches,
129            total_events: self.total_events,
130            wasm_execution_time_ms: self.wasm_execution_time_ms,
131            wasm_fuel_consumed: self.wasm_fuel_consumed,
132            avg_batch_size: self.avg_batch_size,
133            error_count: self.error_count,
134            last_module_swap: self.last_module_swap,
135        }
136    }
137}
kinetic/transforms/wasm/task.rs

kinetic/transforms/wasm/
task.rs
