oura 2.2.0

The tail of Cardano
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93

use aws_config::BehaviorVersion;
use aws_sdk_lambda::{primitives::Blob, Client};
use aws_types::region::Region;
use gasket::framework::*;
use serde::Deserialize;

use crate::framework::*;

pub struct Worker {
    client: Client,
}

#[async_trait::async_trait(?Send)]
impl gasket::framework::Worker<Stage> for Worker {
    async fn bootstrap(stage: &Stage) -> Result<Self, WorkerError> {
        let aws_config = aws_config::defaults(BehaviorVersion::v2025_08_07())
            .region(Region::new(stage.config.region.clone()))
            .load()
            .await;

        let client = Client::new(&aws_config);

        Ok(Self { client })
    }

    async fn schedule(
        &mut self,
        stage: &mut Stage,
    ) -> Result<WorkSchedule<ChainEvent>, WorkerError> {
        let msg = stage.input.recv().await.or_panic()?;
        Ok(WorkSchedule::Unit(msg.payload))
    }

    async fn execute(&mut self, unit: &ChainEvent, stage: &mut Stage) -> Result<(), WorkerError> {
        let point = unit.point().clone();
        let record = unit.record().cloned();

        if record.is_none() {
            return Ok(());
        }

        let payload = serde_json::Value::from(record.unwrap()).to_string();

        let req = self
            .client
            .invoke()
            .function_name(stage.config.function_name.clone())
            .payload(Blob::new(payload));

        req.send().await.or_retry()?;

        stage.ops_count.inc(1);
        stage.latest_block.set(point.slot_or_default() as i64);
        stage.cursor.send(point.clone().into()).await.or_panic()?;

        Ok(())
    }
}

#[derive(Stage)]
#[stage(name = "sink-aws-lambda", unit = "ChainEvent", worker = "Worker")]
pub struct Stage {
    config: Config,

    pub input: MapperInputPort,
    pub cursor: SinkCursorPort,

    #[metric]
    ops_count: gasket::metrics::Counter,

    #[metric]
    latest_block: gasket::metrics::Gauge,
}

#[derive(Default, Debug, Deserialize)]
pub struct Config {
    pub region: String,
    pub function_name: String,
}

impl Config {
    pub fn bootstrapper(self, _ctx: &Context) -> Result<Stage, Error> {
        let stage = Stage {
            config: self,
            ops_count: Default::default(),
            latest_block: Default::default(),
            input: Default::default(),
            cursor: Default::default(),
        };

        Ok(stage)
    }
}