|
| 1 | +use aimdb_core::{buffer::BufferCfg, AimDbBuilder, Consumer, Producer, RuntimeContext}; |
| 2 | +use aimdb_tokio_adapter::{TokioAdapter, TokioRecordRegistrarExt}; |
| 3 | +use std::sync::Arc; |
| 4 | +use std::time::Duration; |
| 5 | + |
| 6 | +#[derive(Clone, Debug)] |
| 7 | +struct FeatureGate { |
| 8 | + rollout_percent: u8, |
| 9 | +} |
| 10 | + |
| 11 | +#[tokio::main] |
| 12 | +async fn main() -> Result<(), Box<dyn std::error::Error>> { |
| 13 | + println!("=== hello-single-latest-async: SingleLatest buffer demo ===\n"); |
| 14 | + |
| 15 | + let adapter = Arc::new(TokioAdapter::new()?); |
| 16 | + let mut builder = AimDbBuilder::new().runtime(adapter); |
| 17 | + |
| 18 | + builder.configure::<FeatureGate>("config.checkout_rollout", |reg| { |
| 19 | + reg.buffer(BufferCfg::SingleLatest) |
| 20 | + .source(rollout_source) |
| 21 | + .tap(rollout_observer); |
| 22 | + }); |
| 23 | + |
| 24 | + let _db = builder.build().await?; |
| 25 | + |
| 26 | + tokio::time::sleep(Duration::from_millis(700)).await; |
| 27 | + println!("Done. SingleLatest keeps only the current value for each subscriber."); |
| 28 | + |
| 29 | + Ok(()) |
| 30 | +} |
| 31 | + |
| 32 | +async fn rollout_source( |
| 33 | + ctx: RuntimeContext<TokioAdapter>, |
| 34 | + producer: Producer<FeatureGate, TokioAdapter>, |
| 35 | +) { |
| 36 | + let time = ctx.time(); |
| 37 | + |
| 38 | + time.sleep(time.millis(50)).await; |
| 39 | + |
| 40 | + for rollout_percent in [0, 10, 25] { |
| 41 | + publish_rollout(&producer, rollout_percent).await; |
| 42 | + } |
| 43 | + |
| 44 | + for rollout_percent in [50, 100] { |
| 45 | + time.sleep(time.millis(120)).await; |
| 46 | + publish_rollout(&producer, rollout_percent).await; |
| 47 | + } |
| 48 | +} |
| 49 | + |
| 50 | +async fn publish_rollout(producer: &Producer<FeatureGate, TokioAdapter>, rollout_percent: u8) { |
| 51 | + let gate = FeatureGate { rollout_percent }; |
| 52 | + match producer.produce(gate).await { |
| 53 | + Ok(()) => println!("source published rollout: {rollout_percent}%"), |
| 54 | + Err(err) => eprintln!("failed to publish rollout {rollout_percent}%: {err}"), |
| 55 | + } |
| 56 | +} |
| 57 | + |
| 58 | +async fn rollout_observer( |
| 59 | + ctx: RuntimeContext<TokioAdapter>, |
| 60 | + consumer: Consumer<FeatureGate, TokioAdapter>, |
| 61 | +) { |
| 62 | + let Ok(mut reader) = consumer.subscribe() else { |
| 63 | + eprintln!("failed to subscribe to config.checkout_rollout"); |
| 64 | + return; |
| 65 | + }; |
| 66 | + let time = ctx.time(); |
| 67 | + |
| 68 | + let mut first = true; |
| 69 | + while let Ok(gate) = reader.recv().await { |
| 70 | + if first { |
| 71 | + first = false; |
| 72 | + if gate.rollout_percent != 0 { |
| 73 | + println!( |
| 74 | + " (rollouts before {}% were overwritten before the tap could read them - SingleLatest keeps only the latest)", |
| 75 | + gate.rollout_percent |
| 76 | + ); |
| 77 | + } |
| 78 | + } |
| 79 | + println!("tap observed current rollout: {}%", gate.rollout_percent); |
| 80 | + if gate.rollout_percent == 100 { |
| 81 | + break; |
| 82 | + } |
| 83 | + time.sleep(time.millis(90)).await; |
| 84 | + } |
| 85 | +} |
0 commit comments