orion-server 0.2.0

use std::sync::Arc;

use async_trait::async_trait;
use dataflow_rs::engine::error::DataflowError;
use dataflow_rs::engine::functions::AsyncFunctionHandler;
use dataflow_rs::engine::task_context::TaskContext;
use dataflow_rs::engine::task_outcome::TaskOutcome;
use serde_json::Value;

use super::connector_helpers::{
    profile_handler, require_cache_connector, require_str_field, resolve_connector, to_exec_error,
};
use crate::connector::ConnectorRegistry;
use crate::connector::cache_backend::CachePool;

/// Workflow function handler for writing values to a cache backend.
pub struct CacheWriteHandler {
    pub cache_pool: Arc<CachePool>,
    pub registry: Arc<ConnectorRegistry>,
}

#[async_trait]
impl AsyncFunctionHandler for CacheWriteHandler {
    type Input = Value;

    async fn execute(
        &self,
        _ctx: &mut TaskContext<'_>,
        input: &Value,
    ) -> dataflow_rs::Result<TaskOutcome> {
        profile_handler("cache_write", input, async move {
            let connector_name = require_str_field(input, "connector", "cache_write")?;
            let key = require_str_field(input, "key", "cache_write")?;

            let connector_config = resolve_connector(&self.registry, connector_name).await?;
            let cache_config = require_cache_connector(&connector_config, connector_name)?;

            let backend = self
                .cache_pool
                .get_backend(connector_name, cache_config)
                .await
                .map_err(to_exec_error)?;

            let value_str = match input.get("value") {
                Some(Value::String(s)) => s.clone(),
                Some(v) => serde_json::to_string(v).map_err(|e| {
                    DataflowError::Validation(format!("Failed to serialize value for cache: {e}"))
                })?,
                None => {
                    return Err(DataflowError::Validation(
                        "cache_write requires 'value'".into(),
                    ));
                }
            };

            let ttl = input.get("ttl_secs").and_then(|v| v.as_u64());

            if let Some(ttl) = ttl {
                backend
                    .set_ex(key, &value_str, ttl)
                    .await
                    .map_err(to_exec_error)?;
            } else {
                backend.set(key, &value_str).await.map_err(to_exec_error)?;
            }

            tracing::debug!(
                key = %key,
                ttl = ?ttl,
                "Wrote value to cache"
            );

            Ok(TaskOutcome::Success)
        })
        .await
    }
}