174 lines
7.3 KiB
Org Mode
174 lines
7.3 KiB
Org Mode
#+TITLE: The System Memory (memory.lisp)
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#+AUTHOR: Agent
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#+FILETAGS: :harness:memory:
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#+STARTUP: content
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#+PROPERTY: header-args:lisp :tangle memory.lisp
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* Overview
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The Memory module is the cognitive bedrock of the opencortex. It is not a database; it is the agent's live, active "brain" state.
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* Implementation
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** Package Context
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#+begin_src lisp
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(in-package :opencortex)
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#+end_src
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** The Object Repository
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#+begin_src lisp
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(defvar *memory* (make-hash-table :test 'equal))
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(defvar *history-store* (make-hash-table :test 'equal)
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"Immutable Merkle-Tree versioning store mapping hashes to objects.")
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#+end_src
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** The Data Structure (org-object)
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#+begin_src lisp
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(defstruct org-object
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id type attributes content vector parent-id children version last-sync hash)
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(defmethod make-load-form ((obj org-object) &optional env)
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(make-load-form-saving-slots obj :environment env))
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(defun copy-org-object (obj)
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(make-org-object :id (org-object-id obj)
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:type (org-object-type obj)
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:attributes (copy-list (org-object-attributes obj))
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:content (org-object-content obj)
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:vector (org-object-vector obj)
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:parent-id (org-object-parent-id obj)
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:children (copy-list (org-object-children obj))
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:version (org-object-version obj)
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:last-sync (org-object-last-sync obj)
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:hash (org-object-hash obj)))
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#+end_src
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** Merkle Tree Integrity
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#+begin_src lisp
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(defun compute-merkle-hash (id type attributes content child-hashes)
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(let* ((alist (loop for (k v) on attributes by #'cddr collect (cons k v)))
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(sorted-alist (sort alist #'string< :key (lambda (x) (format nil "~a" (car x)))))
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(attr-string (format nil "~s" sorted-alist))
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(children-string (format nil "~{~a~}" child-hashes))
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(data-string (format nil "ID:~a|TYPE:~s|ATTRS:~a|CONTENT:~a|CHILDREN:~a"
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id type attr-string (or content "") children-string))
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(digester (ironclad:make-digest :sha256)))
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(ironclad:update-digest digester (ironclad:ascii-string-to-byte-array data-string))
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(ironclad:byte-array-to-hex-string (ironclad:produce-digest digester))))
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#+end_src
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** Ingest (ingest-ast)
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#+begin_src lisp
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(defun ingest-ast (ast &optional parent-id)
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(let* ((type (getf ast :type))
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(props (getf ast :properties))
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(id (or (getf props :ID) (format nil "temp-~a" (get-universal-time))))
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(contents (getf ast :contents))
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(raw-content (when (eq type :HEADLINE)
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(format nil "~a~%~a" (getf props :TITLE) (or (getf ast :raw-content) ""))))
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(child-ids nil) (child-hashes nil))
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(dolist (child contents)
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(when (listp child)
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(let ((child-id (ingest-ast child id)))
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(push child-id child-ids)
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(let ((child-obj (gethash child-id *memory*)))
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(when child-obj (push (org-object-hash child-obj) child-hashes))))))
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(setf child-ids (nreverse child-ids))
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(setf child-hashes (nreverse child-hashes))
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(let* ((hash (compute-merkle-hash id type props raw-content child-hashes))
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(existing-obj (gethash hash *history-store*))
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(obj (or existing-obj
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(make-org-object
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:id id :type type :attributes props :content raw-content
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:parent-id parent-id :children child-ids
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:version (get-universal-time) :last-sync (get-universal-time)
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:hash hash))))
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(unless existing-obj (setf (gethash hash *history-store*) obj))
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(setf (gethash id *memory*) obj)
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id)))
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#+end_src
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** Snapshots (snapshot-memory)
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#+begin_src lisp
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(defvar *object-store-snapshots* nil)
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(defun copy-hash-table (hash-table)
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(let ((new-table (make-hash-table :test (hash-table-test hash-table)
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:size (hash-table-size hash-table))))
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(maphash (lambda (k v) (setf (gethash k new-table) v)) hash-table)
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new-table))
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(defun snapshot-memory ()
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(let ((snapshot (make-hash-table :test 'equal :size (hash-table-size *memory*))))
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(maphash (lambda (k v) (setf (gethash k snapshot) (copy-org-object v))) *memory*)
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(push (list :timestamp (get-universal-time) :data snapshot) *object-store-snapshots*)
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(when (> (length *object-store-snapshots*) 20) (setf *object-store-snapshots* (subseq *object-store-snapshots* 0 20)))
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(harness-log "MEMORY - CoW Memory snapshot created.")))
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(defun rollback-memory (&optional (index 0))
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(let ((snapshot (nth index *object-store-snapshots*)))
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(if snapshot
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(progn (setf *memory* (copy-hash-table (getf snapshot :data)))
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(harness-log "MEMORY - Memory rolled back to snapshot ~a" index))
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(harness-log "MEMORY ERROR - Snapshot ~a not found." index))))
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#+end_src
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** Persistence (save-memory / load-memory)
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#+begin_src lisp
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(defvar *memory-snapshot-path* nil)
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(defun ensure-memory-snapshot-path ()
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(or *memory-snapshot-path*
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(let ((env-path (uiop:getenv "MEMORY_SNAPSHOT_PATH")))
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(setf *memory-snapshot-path*
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(or env-path (namestring (uiop:merge-pathnames* "memory.snap" (user-homedir-pathname))))))))
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(defun save-memory-to-disk ()
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(let ((path (ensure-memory-snapshot-path)))
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(with-open-file (stream path :direction :output :if-exists :supersede :if-does-not-exist :create)
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(let ((memory-alist nil) (history-alist nil))
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(maphash (lambda (k v) (push (cons k v) memory-alist)) *memory*)
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(maphash (lambda (k v) (push (cons k v) history-alist)) *history-store*)
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(prin1 (list :memory memory-alist :history-store history-alist) stream)))
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(harness-log "MEMORY - Saved to ~a" path)))
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(defun load-memory-from-disk ()
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(let ((path (ensure-memory-snapshot-path)))
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(when (uiop:file-exists-p path)
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(handler-case
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(with-open-file (stream path :direction :input)
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(let ((data (read stream nil)))
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(when data
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(let ((memory-alist (getf data :memory)) (history-alist (getf data :history-store)))
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(setf *memory* (make-hash-table :test 'equal :size (length memory-alist)))
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(dolist (kv memory-alist) (setf (gethash (car kv) *memory*) (cdr kv)))
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(setf *history-store* (make-hash-table :test 'equal :size (length history-alist)))
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(dolist (kv history-alist) (setf (gethash (car kv) *history-store*) (cdr kv)))
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(harness-log "MEMORY - Loaded from ~a (~a objects)" path (hash-table-size *memory*))))))
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(error (c) (harness-log "MEMORY WARNING - Failed to load snapshot: ~a" c)))))
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t)
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#+end_src
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* Test Suite
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#+begin_src lisp :tangle ../tests/memory-tests.lisp
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(ql:quickload :fiveam :silent t))
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(defpackage :opencortex-memory-tests
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(:use :cl :fiveam :opencortex)
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(:export #:memory-suite))
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(in-package :opencortex-memory-tests)
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(def-suite memory-suite :description "Tests for the Merkle-Tree Memory")
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(in-suite memory-suite)
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(test merkle-hash-consistency
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(let* ((ast1 '(:type :HEADLINE :properties (:ID "test-1" :TITLE "Node 1") :contents nil)))
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(clrhash opencortex::*memory*)
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(let ((id1 (ingest-ast ast1)))
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(let ((hash1 (org-object-hash (lookup-object id1))))
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(clrhash opencortex::*memory*)
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(let ((id2 (ingest-ast ast1)))
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(is (equal hash1 (org-object-hash (lookup-object id2)))))))))
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#+end_src
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