myko 6.0.0

myko in rust
Documentation 
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//! Minimal server context for query handlers.

use std::sync::Arc;

use hyphae::{Cell, CellImmutable};

use super::{
    cell::FilteredCellMap, registration::QueryFactory, request::QueryRequest, traits::AnyQuery,
};
use crate::{
    core::report::{ReportFactory, ReportHandler, ReportOutputType},
    request::RequestContext,
    server::MykoServerContext,
    store::StoreRegistry,
};

/// Minimal server context provided to query handlers.
///
/// This is a lightweight context that provides queries access to:
/// - Server identity (`host_id`)
/// - Entity stores (`registry`)
///
/// For more capabilities (publishing, relationships), use `MykoServerContext`.
#[derive(Clone, Debug)]
pub struct QueryContext {
    pub req: Arc<RequestContext>,
}

impl crate::core::capability::sealed::Sealed for QueryContext {}
impl crate::core::capability::RequestScoped for QueryContext {
    fn __request(&self) -> &Arc<RequestContext> {
        &self.req
    }
}

/// Server-only context for advanced query composition.
///
/// Use this from `QueryHandler::build_view` to compose query cells from other
/// queries while preserving request context (tx, `host_id`, lineage).
#[derive(Clone)]
pub struct QueryBuildContext {
    pub query_context: Arc<QueryContext>,
    registry: Arc<StoreRegistry>,
    server_ctx: Option<Arc<MykoServerContext>>,
}

impl QueryBuildContext {
    #[must_use]
    pub const fn new(
        query_context: Arc<QueryContext>,
        registry: Arc<StoreRegistry>,
        server_ctx: Option<Arc<MykoServerContext>>,
    ) -> Self {
        Self {
            query_context,
            registry,
            server_ctx,
        }
    }

    /// Build a reactive `CellMap` for another query using the same request context.
    ///
    /// Delegates to `MykoServerContext::query_map_untyped`, which is the canonical
    /// cached path. A previous local `subquery_cache` was removed so that
    /// dedupe lives in exactly one place (the server context).
    ///
    /// # Errors
    ///
    /// Returns an error when the requested operation cannot be completed.
    pub fn query<Q>(&self, query: Q) -> Result<FilteredCellMap, String>
    where
        Q: QueryFactory + Clone,
        Q::Item: crate::core::item::Eventable
            + crate::common::with_id::WithId
            + serde::de::DeserializeOwned
            + Clone
            + std::fmt::Debug
            + Send
            + Sync
            + 'static,
    {
        if let Some(server_ctx) = self.server_ctx.clone() {
            return Ok(server_ctx.query_map_untyped(query, self.query_context.req.clone()));
        }

        // Fallback for test/wasm contexts that don't carry a MykoServerContext.
        // Builds the cell directly via the type's cell factory.
        let wrapped = QueryRequest::with_tx(query, self.query_context.req.tx.clone());
        let any_query: Arc<dyn AnyQuery> = Arc::new(wrapped);
        Q::cell_factory(
            any_query,
            self.registry.clone(),
            self.query_context.req.clone(),
            self.server_ctx.clone(),
        )
    }

    /// Build a reactive cell for a report using the same request context.
    ///
    /// # Errors
    ///
    /// Returns an error when the requested operation cannot be completed.
    pub fn report<R>(
        &self,
        report: R,
    ) -> Result<Cell<Arc<<R as ReportOutputType>::Output>, CellImmutable>, String>
    where
        R: ReportFactory + ReportHandler<Output = <R as ReportOutputType>::Output> + Clone,
        <R as ReportOutputType>::Output:
            crate::common::to_value::ToValue + std::fmt::Debug + Send + Sync + 'static,
    {
        let Some(server_ctx) = self.server_ctx.clone() else {
            return Err("QueryBuildContext.report requires server context".to_string());
        };

        Ok(server_ctx.report(report, self.query_context.req.clone()))
    }

    #[must_use]
    pub fn registry(&self) -> Arc<StoreRegistry> {
        self.registry.clone()
    }
}

// Query build keeps its own `query`/`report` (fallible over an optional
// server context) and `registry` inherent — they don't fit the infallible
// capability traits — but adopts RequestScoped for tx/host_id/lineage.
impl crate::core::capability::sealed::Sealed for QueryBuildContext {}
impl crate::core::capability::RequestScoped for QueryBuildContext {
    fn __request(&self) -> &Arc<RequestContext> {
        &self.query_context.req
    }
}