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authorMarcos Magueta <maguetamarcos@gmail.com>2026-09-26 15:30:53 -0300
committerMarcos Magueta <maguetamarcos@gmail.com>2026-09-26 15:30:53 -0300
commite32ba6294781691846c3ab19281fe977350b4d0f (patch)
treef38e92ba2fc03e966d7263c7ee2e0b5d7983ebae /lib/manipulation.ml
parentbe375a52da6174dfda5b68617d27e1542cc80499 (diff)
downloadSakura-e32ba6294781691846c3ab19281fe977350b4d0f.tar.gz
Sakura-e32ba6294781691846c3ab19281fe977350b4d0f.zip
preparation cleanup for RNT integration
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-(** Multigroup manipulation operations.
-
- This module implements the core operations for the relational engine:
- - Multigroup creation
- - Relation creation and deletion
- - Tuple insertion and deletion
- - Query operations
-
- All operations are immutable: they return new multigroup/relation states
- rather than modifying existing ones. The storage layer handles persistence.
-
- This is a functor that takes a storage backend, ensuring all tuple data is
- properly persisted to the content-addressed store. *)
-
-(** Functor to create manipulation operations with a storage backend *)
-module Make (Storage : Management.Physical.S) = struct
- type storage = Storage.t
- type error = Condition.t
-
- module Error = struct
- open Condition
-
- (* TODO: more specific errors *)
- let storage_error message = condition "storage-error" message empty
- end
-
- let ( let* ) = Result.bind
-
- (* State Persistence - Store relation and database states *)
-
- (** Store a relation state to storage *)
- let store_relation (storage : storage) (relation : Relation.relation) : (unit, error) Result.t =
- match
- Storage.store_raw storage relation#hash (Storable.Relation.to_bytes @@ relation#serialize ())
- with
- | Error _ -> Error (Error.storage_error "Failed to store relation")
- | Ok () -> Ok ()
-
- (** Store a database state to storage. Keyed by [db#name]; content-hashing of
- mgs is no longer maintained on the Sakura side — the kernel owns mg
- content addressing. *)
- let store_multigroup (storage : storage) (db : Management.Multigroup.multigroup) :
- (unit, error) Result.t =
- match Storage.store_raw storage db#name (Storable.Multigroup.to_bytes @@ db#serialize ()) with
- | Error _ -> Error (Error.storage_error "Failed to store multigroup")
- | Ok () -> Ok ()
-
- (** Load a relation state from storage by hash *)
- let load_relation (storage : storage) (rel_hash : Conventions.Hash.t) :
- (Relation.stored option, error) Result.t =
- match Storage.load_raw storage rel_hash with
- | Error _ -> Error (Error.storage_error "Failed to load relation")
- | Ok None -> Ok None
- | Ok (Some bytes) ->
- let _stored = Storable.Relation.of_bytes bytes in
- let name = failwith "NOT IMPLEMENTED" in
- let schema = failwith "NOT IMPLEMENTED" in
- let constraints = failwith "NOT IMPLEMENTED" in
- let cardinality = failwith "NOT IMPLEMENTED" in
- let membership_criteria = Constraint.build_membership_criteria ~_name:name ~schema in
- let relation =
- new Relation.stored
- ~name ~schema ~constraints ~cardinality ~membership_criteria ~provenance:None
- ~lineage:None
- in
- Ok (Some relation)
-
- let load_multigroup (storage : storage) (mg_hash : Conventions.Hash.t) :
- (Management.Multigroup.multigroup option, error) Result.t =
- match Storage.load_raw storage mg_hash with
- | Error _ -> Error (Error.storage_error "Failed to load multigroup")
- | Ok None -> Ok None
- | Ok (Some bytes) ->
- (* TODO: Properly deserialize multigroup state *)
- let _stored = Storable.Multigroup.of_bytes bytes in
- let name = failwith "NOT IMPLEMENTED" in
- let mg = new Management.Multigroup.multigroup ~name in
- Ok (Some mg)
-
- (* Tuple Operations - Storage Integrated *)
-
- (** Store each attribute value and return map of attr_name -> attr_hash *)
- let store_attributes (_storage : storage) (_tuple : Tuple.materialized) :
- ((string * Conventions.Hash.t) list, error) Result.t =
- failwith "NOT IMPLEMENTED"
-
- (** Load a tuple from storage by its hash *)
- let load_tuple (storage : storage) (tuple_hash : Conventions.Hash.t) :
- (Tuple.materialized option, error) Result.t =
- match Storage.load_raw storage tuple_hash with
- | Error _ -> Error (Error.storage_error "Failed to load tuple")
- | Ok None -> Ok None
- | Ok (Some tuple_bytes) ->
- let _stored = Storable.Tuple.of_bytes tuple_bytes in
- let attributes = failwith "NOT IMPLEMENTED" in
- let relation = failwith "NOT IMPLEMENTED" in
- let rec load_attrs acc = function
- | [] -> Ok (List.rev acc)
- | (name, attr_hash) :: rest -> (
- match Storage.load_raw storage attr_hash with
- | Error _ -> Error (Error.storage_error ("Failed to load attribute: " ^ name))
- | Ok None -> Error (Error.storage_error ("Attribute not found: " ^ name))
- | Ok (Some value_bytes) ->
- let value : Conventions.AbstractValue.t = Marshal.from_bytes value_bytes 0 in
- let attr : Attribute.materialized = {value} in
- load_attrs ((name, attr) :: acc) rest )
- in
- load_attrs [] attributes
- |> Result.map
- (List.fold_left
- (fun m (k, v) -> Tuple.AttributeMap.add k v m)
- Tuple.AttributeMap.empty )
- |> Result.map (fun attributes -> Some {Tuple.relation; attributes})
-end