distributed 1.8.2

CQRS/ES framework for Rust using Plain Old Rust Structs — append-only events, replay, snapshots, outbox, service bus, and pluggable infrastructure
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//! Basic microsvc integration tests — exercises dispatch with a real repository.

use distributed::microsvc::{Context, HandlerError, Service, Session};
use distributed::{AggregateBuilder, HashMapRepository};
use serde_json::json;

use crate::models::counter::{Counter, CreateCounter, DecrementCounter, IncrementCounter};

#[tokio::test]
async fn full_lifecycle() {
    let service = Service::new()
        .with_repo(HashMapRepository::new())
        .command("counter.initialize")
        .handle(|ctx: &Context<HashMapRepository>| {
            let input = ctx.input::<CreateCounter>();
            let counter_repo = ctx.repo().clone().aggregate::<Counter>();
            async move {
                let input = input?;
                let mut counter = Counter::default();
                counter.create(input.id.clone())?;
                counter_repo.commit(&mut counter).await?;
                Ok(json!({ "id": input.id }))
            }
        })
        .command("counter.increment")
        .handle(|ctx: &Context<HashMapRepository>| {
            let input = ctx.input::<IncrementCounter>();
            let counter_repo = ctx.repo().clone().aggregate::<Counter>();
            async move {
                let input = input?;
                let mut counter: Counter = counter_repo
                    .get(&input.id)
                    .await?
                    .ok_or_else(|| HandlerError::NotFound(input.id.clone()))?;
                counter.increment(input.amount)?;
                counter_repo.commit(&mut counter).await?;
                Ok(json!({ "value": counter.value }))
            }
        })
        .command("counter.decrement")
        .handle(|ctx: &Context<HashMapRepository>| {
            let input = ctx.input::<DecrementCounter>();
            let counter_repo = ctx.repo().clone().aggregate::<Counter>();
            async move {
                let input = input?;
                let mut counter: Counter = counter_repo
                    .get(&input.id)
                    .await?
                    .ok_or_else(|| HandlerError::NotFound(input.id.clone()))?;
                counter.decrement(input.amount)?;
                counter_repo.commit(&mut counter).await?;
                Ok(json!({ "value": counter.value }))
            }
        });

    // Create
    let result = service
        .dispatch("counter.initialize", json!({ "id": "c1" }), Session::new())
        .await
        .unwrap();
    assert_eq!(result, json!({ "id": "c1" }));

    // Increment twice
    let result = service
        .dispatch(
            "counter.increment",
            json!({ "id": "c1", "amount": 5 }),
            Session::new(),
        )
        .await
        .unwrap();
    assert_eq!(result, json!({ "value": 5 }));

    service
        .dispatch(
            "counter.increment",
            json!({ "id": "c1", "amount": 3 }),
            Session::new(),
        )
        .await
        .unwrap();

    // Decrement
    let result = service
        .dispatch(
            "counter.decrement",
            json!({ "id": "c1", "amount": 2 }),
            Session::new(),
        )
        .await
        .unwrap();
    assert_eq!(result, json!({ "value": 6 }));

    // Verify final state via repo
    let counter_repo = service.repo().clone().aggregate::<Counter>();
    let counter: Counter = counter_repo.get("c1").await.unwrap().unwrap();
    assert_eq!(counter.value, 6);
}