icydb-core 0.94.3

//! Module: db
//!
//! Responsibility: root subsystem wiring, façade re-exports, and runtime hook contracts.
//! Does not own: feature semantics delegated to child modules (`query`, `executor`, etc.).
//! Boundary: top-level db API and internal orchestration entrypoints.

pub(crate) mod access;
pub(crate) mod contracts;
pub(crate) mod cursor;
pub(crate) mod diagnostics;
pub(crate) mod identity;
#[cfg(feature = "diagnostics")]
pub(crate) mod physical_access;
pub(crate) mod predicate;
pub(crate) mod query;
pub(crate) mod registry;
pub(crate) mod response;
pub(crate) mod scalar_expr;
pub(crate) mod schema;
pub(crate) mod session;
#[cfg(feature = "sql")]
pub(crate) mod sql;

pub(in crate::db) mod codec;
pub(in crate::db) mod commit;
pub(in crate::db) mod data;
pub(in crate::db) mod direction;
pub(in crate::db) mod executor;
pub(in crate::db) mod index;
pub(in crate::db) mod migration;
pub(in crate::db) mod numeric;
pub(in crate::db) mod relation;
pub(in crate::db) mod sql_shared;

use crate::{
    db::{
        commit::{CommitRowOp, PreparedRowCommitOp, ensure_recovered},
        data::RawDataKey,
        executor::Context,
        registry::StoreHandle,
        relation::model_has_strong_relations_to_target,
    },
    error::InternalError,
    traits::{CanisterKind, EntityKind, EntityValue},
    types::EntityTag,
};
use std::{collections::BTreeSet, marker::PhantomData, thread::LocalKey};

pub use codec::cursor::{decode_cursor, encode_cursor};
pub use commit::EntityRuntimeHooks;
pub use data::{
    DataStore, PersistedRow, PersistedScalar, ScalarSlotValueRef, ScalarValueRef, SlotReader,
    SlotWriter, UpdatePatch, decode_persisted_custom_many_slot_payload,
    decode_persisted_custom_slot_payload, decode_persisted_non_null_slot_payload_by_kind,
    decode_persisted_option_scalar_slot_payload, decode_persisted_option_slot_payload_by_kind,
    decode_persisted_option_slot_payload_by_meta, decode_persisted_scalar_slot_payload,
    decode_persisted_slot_payload_by_kind, decode_persisted_slot_payload_by_meta,
    encode_persisted_custom_many_slot_payload, encode_persisted_custom_slot_payload,
    encode_persisted_option_scalar_slot_payload, encode_persisted_option_slot_payload_by_meta,
    encode_persisted_scalar_slot_payload, encode_persisted_slot_payload_by_kind,
    encode_persisted_slot_payload_by_meta,
};
#[cfg(feature = "diagnostics")]
#[doc(hidden)]
pub use data::{StructuralReadMetrics, with_structural_read_metrics};
#[cfg(all(test, not(feature = "diagnostics")))]
#[expect(unused_imports)]
pub(crate) use data::{StructuralReadMetrics, with_structural_read_metrics};
pub use diagnostics::{
    ExecutionAccessPathVariant, ExecutionMetrics, ExecutionOptimization, ExecutionTrace,
    IntegrityReport, IntegrityStoreSnapshot, IntegrityTotals, StorageReport,
};
#[doc(hidden)]
pub use executor::EntityAuthority;
pub use executor::MutationMode;
pub use executor::{ExecutionFamily, RouteExecutionMode};
#[cfg(feature = "diagnostics")]
#[doc(hidden)]
pub use executor::{RowCheckMetrics, with_row_check_metrics};
#[cfg(all(test, not(feature = "diagnostics")))]
#[expect(unused_imports)]
pub(crate) use executor::{RowCheckMetrics, with_row_check_metrics};
#[cfg(feature = "diagnostics")]
#[doc(hidden)]
pub use executor::{ScalarMaterializationLaneMetrics, with_scalar_materialization_lane_metrics};
#[cfg(all(test, not(feature = "diagnostics")))]
#[expect(unused_imports)]
pub(crate) use executor::{
    ScalarMaterializationLaneMetrics, with_scalar_materialization_lane_metrics,
};
pub use identity::{EntityName, IndexName};
pub use index::{IndexState, IndexStore};
pub use migration::{
    MigrationCursor, MigrationPlan, MigrationRowOp, MigrationRunOutcome, MigrationRunState,
    MigrationStep,
};
pub use predicate::{
    CoercionId, CompareFieldsPredicate, CompareOp, ComparePredicate, MissingRowPolicy, Predicate,
    UnsupportedQueryFeature,
};
#[doc(hidden)]
pub use predicate::{
    parse_generated_index_predicate_sql, validate_generated_index_predicate_fields,
};
pub use query::{
    api::ResponseCardinalityExt,
    builder::{
        AggregateExpr, FieldRef, NumericProjectionExpr, RoundProjectionExpr, TextProjectionExpr,
        ValueProjectionExpr, add, avg, contains, count, count_by, div, ends_with, exists, first,
        last, left, length, lower, ltrim, max, max_by, min, min_by, mul, position, replace, right,
        round, round_expr, rtrim, starts_with, sub, substring, substring_with_length, sum, trim,
        upper,
    },
    explain::{
        ExplainAggregateTerminalPlan, ExplainExecutionDescriptor, ExplainExecutionMode,
        ExplainExecutionNodeDescriptor, ExplainExecutionNodeType, ExplainExecutionOrderingSource,
        ExplainPlan,
    },
    expr::{FilterExpr, OrderExpr, OrderTerm, asc, desc, field},
    fluent::{
        delete::FluentDeleteQuery,
        load::{FluentLoadQuery, LoadQueryResult, PagedLoadQuery},
    },
    intent::{CompiledQuery, IntentError, PlannedQuery, Query, QueryError, QueryExecutionError},
    plan::{DeleteSpec, LoadSpec, OrderDirection, PlanError, QueryMode},
    trace::{QueryTracePlan, TraceExecutionFamily},
};
pub use registry::StoreRegistry;
pub use response::{
    EntityResponse, GroupedRow, PagedGroupedExecution, PagedGroupedExecutionWithTrace,
    PagedLoadExecution, PagedLoadExecutionWithTrace, ProjectedRow, ProjectionResponse,
    Response as RowResponse, ResponseError, ResponseRow, Row, WriteBatchResponse,
};
pub use schema::{
    EntityFieldDescription, EntityIndexDescription, EntityRelationCardinality,
    EntityRelationDescription, EntityRelationStrength, EntitySchemaDescription, ValidateError,
};
#[cfg(not(feature = "sql"))]
pub use session::DbSession;
#[cfg(feature = "diagnostics")]
pub use session::QueryExecutionAttribution;
#[cfg(all(feature = "sql", feature = "diagnostics"))]
pub use session::SqlQueryExecutionAttribution;
#[cfg(feature = "sql")]
pub use session::{DbSession, SqlStatementResult};
#[cfg(all(feature = "sql", feature = "diagnostics"))]
#[doc(hidden)]
pub use session::{
    SqlProjectionMaterializationMetrics, with_sql_projection_materialization_metrics,
};
#[cfg(feature = "sql")]
pub use sql::identifier::{
    identifier_last_segment, identifiers_tail_match, normalize_identifier_to_scope,
    split_qualified_identifier,
};
#[cfg(feature = "sql")]
pub use sql::lowering::LoweredSqlCommand;

///
/// Db
/// A handle to the set of stores registered for a specific canister domain.
///

pub(crate) struct Db<C: CanisterKind> {
    store: &'static LocalKey<StoreRegistry>,
    entity_runtime_hooks: &'static [EntityRuntimeHooks<C>],
    _marker: PhantomData<C>,
}

impl<C: CanisterKind> Db<C> {
    /// Construct a db handle without per-entity runtime hooks.
    #[must_use]
    #[cfg(test)]
    pub(crate) const fn new(store: &'static LocalKey<StoreRegistry>) -> Self {
        Self::new_with_hooks(store, &[])
    }

    /// Construct a db handle with explicit per-entity runtime hook wiring.
    #[must_use]
    pub(crate) const fn new_with_hooks(
        store: &'static LocalKey<StoreRegistry>,
        entity_runtime_hooks: &'static [EntityRuntimeHooks<C>],
    ) -> Self {
        #[cfg(debug_assertions)]
        {
            let _ = crate::db::commit::debug_assert_unique_runtime_hook_tags(entity_runtime_hooks);
        }

        Self {
            store,
            entity_runtime_hooks,
            _marker: PhantomData,
        }
    }

    #[must_use]
    pub(in crate::db) const fn context<E>(&self) -> Context<'_, E>
    where
        E: EntityKind<Canister = C> + EntityValue,
    {
        Context::new(self)
    }

    /// Resolve one named store after enforcing startup recovery.
    pub(in crate::db) fn recovered_store(&self, path: &str) -> Result<StoreHandle, InternalError> {
        ensure_recovered(self)?;

        self.store_handle(path)
    }

    // Resolve one named store without re-entering recovery.
    //
    // Internal commit/recovery paths already own recovery authority and must
    // not bounce back through `ensure_recovered`, or they can recurse through
    // replay/rebuild preparation.
    fn store_handle(&self, path: &str) -> Result<StoreHandle, InternalError> {
        self.with_store_registry(|registry| registry.try_get_store(path))
    }

    /// Ensure startup/in-progress commit recovery has been applied.
    pub(crate) fn ensure_recovered_state(&self) -> Result<(), InternalError> {
        ensure_recovered(self)
    }

    /// Execute one closure against the registered store set.
    pub(crate) fn with_store_registry<R>(&self, f: impl FnOnce(&StoreRegistry) -> R) -> R {
        self.store.with(|reg| f(reg))
    }

    /// Resolve one stable in-process cache scope identifier for this store registry.
    ///
    /// Session-level SQL and structural query caches use this scope to share
    /// reusable artifacts across fresh `DbSession` values that point at the
    /// same generated canister store wiring without leaking entries across
    /// unrelated registries in tests or multi-canister host processes.
    #[must_use]
    pub(in crate::db) fn cache_scope_id(&self) -> usize {
        std::ptr::from_ref::<LocalKey<StoreRegistry>>(self.store) as usize
    }

    /// Build one named-store resolver for executor/runtime helpers.
    #[must_use]
    pub(in crate::db) fn store_resolver(&self) -> executor::StoreResolver<'_> {
        executor::StoreResolver::new(self)
    }

    /// Mark every registered index store as fully rebuilt and query-visible.
    ///
    /// Recovery restores visibility only after rebuild and post-recovery
    /// integrity validation complete successfully.
    pub(in crate::db) fn mark_all_registered_index_stores_ready(&self) {
        self.with_store_registry(|registry| {
            for (_, handle) in registry.iter() {
                handle.mark_index_ready();
            }
        });
    }

    /// Build one storage diagnostics report for registered stores/entities.
    pub(crate) fn storage_report(
        &self,
        name_to_path: &[(&'static str, &'static str)],
    ) -> Result<StorageReport, InternalError> {
        diagnostics::storage_report(self, name_to_path)
    }

    /// Build one storage diagnostics report using default entity-path labels.
    pub(crate) fn storage_report_default(&self) -> Result<StorageReport, InternalError> {
        diagnostics::storage_report_default(self)
    }

    /// Build one integrity scan report for registered stores/entities.
    pub(crate) fn integrity_report(&self) -> Result<IntegrityReport, InternalError> {
        diagnostics::integrity_report(self)
    }

    pub(in crate::db) fn prepare_row_commit_op(
        &self,
        op: &CommitRowOp,
    ) -> Result<PreparedRowCommitOp, InternalError> {
        let hooks = self.runtime_hook_for_entity_path(op.entity_path.as_ref())?;
        let store = self.store_handle(hooks.store_path)?;

        (hooks.prepare_row_commit_with_readers)(self, op, &store, &store)
    }

    /// Execute one bounded migration run using explicit row-op plan contracts.
    pub(crate) fn execute_migration_plan(
        &self,
        plan: &migration::MigrationPlan,
        max_steps: usize,
    ) -> Result<migration::MigrationRunOutcome, InternalError> {
        migration::execute_migration_plan(self, plan, max_steps)
    }

    // Validate strong relation constraints for delete-selected target keys.
    pub(crate) fn validate_delete_strong_relations(
        &self,
        target_path: &str,
        deleted_target_keys: &BTreeSet<RawDataKey>,
    ) -> Result<(), InternalError> {
        // Skip hook traversal when no target keys were deleted.
        if deleted_target_keys.is_empty() {
            return Ok(());
        }

        // Delegate delete-side relation validation to each entity runtime hook.
        for hooks in self.entity_runtime_hooks {
            if !model_has_strong_relations_to_target(hooks.model, target_path) {
                continue;
            }

            (hooks.validate_delete_strong_relations)(self, target_path, deleted_target_keys)?;
        }

        Ok(())
    }
}

impl<C: CanisterKind> Db<C> {
    /// Return whether this db has any registered runtime hook callbacks.
    #[must_use]
    pub(crate) const fn has_runtime_hooks(&self) -> bool {
        commit::has_runtime_hooks(self.entity_runtime_hooks)
    }

    /// Return one deterministic list of registered runtime entity names.
    #[must_use]
    pub(crate) fn runtime_entity_names(&self) -> Vec<String> {
        self.entity_runtime_hooks
            .iter()
            .map(|hooks| hooks.model.name().to_string())
            .collect()
    }

    // Resolve exactly one runtime hook for a persisted entity tag.
    // Duplicate matches are treated as store invariants.
    pub(crate) fn runtime_hook_for_entity_tag(
        &self,
        entity_tag: EntityTag,
    ) -> Result<&EntityRuntimeHooks<C>, InternalError> {
        commit::resolve_runtime_hook_by_tag(self.entity_runtime_hooks, entity_tag)
    }

    // Resolve exactly one runtime hook for a persisted entity path.
    // Duplicate matches are treated as store invariants.
    pub(crate) fn runtime_hook_for_entity_path(
        &self,
        entity_path: &str,
    ) -> Result<&EntityRuntimeHooks<C>, InternalError> {
        commit::resolve_runtime_hook_by_path(self.entity_runtime_hooks, entity_path)
    }
}

impl<C: CanisterKind> Copy for Db<C> {}

impl<C: CanisterKind> Clone for Db<C> {
    fn clone(&self) -> Self {
        *self
    }
}