74 lines
2 KiB
Common Lisp
74 lines
2 KiB
Common Lisp
;;; cl-scopes/storage/storage.lisp
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;;;; Common layer for SQL storage functionality.
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(defpackage :scopes/storage
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(:use :common-lisp)
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(:export #:*db-config*
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#:make-engine #:make-storage
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#:db-options #:db-params #:qualified-table-name
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#:do-sql #:drop-table
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#:schema))
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(in-package :scopes/storage)
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(defparameter *db-config* nil)
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(defvar *backends*
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'(:dbi dbi-make-engine))
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(defvar *db-params*
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'(:sqlite3 (:id-type integer :json-type json)
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:postgres (:id-type bigserial :json-type jsonb)))
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(defclass db-engine ()
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((connect :initarg :connect)
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(params :initarg :params)
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(config :reader config :initarg :config)))
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(defun make-engine ()
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(let ((backend (getf *db-config* :backend)))
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(funcall (getf *backends* backend) *db-config*)))
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(defclass storage ()
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((engine :reader engine :initarg :engine)
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(conn :reader conn)
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(schema :accessor schema)))
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(defun make-storage (engine)
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(let ((st (make-instance 'storage :engine engine))
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(conn (funcall (slot-value engine 'connect))))
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(setf (slot-value st 'conn) conn)
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st))
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(defun db-params (st)
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(slot-value (slot-value st 'engine) 'params))
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(defun db-options (st)
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(let ((config (config (engine st))))
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(getf config :options)))
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(defun qualified-table-name (st tn)
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(let ((schema (schema st)))
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(if schema
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(intern (format nil "~a.~a" schema (symbol-name tn)))
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tn)))
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(defun do-sql (st spec)
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(let ((sql (sxql:yield spec)))
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(print sql)
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(dbi:do-sql (conn st) sql)))
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(defun drop-table (st tn)
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(do-sql st (sxql:drop-table tn :if-exists t)))
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;;; backend-/driver-specific stuff
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(defun dbi-make-engine (config)
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(let* ((db-type (getf config :db-type))
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(params (getf *db-params* db-type))
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(conn-args (getf config :connect-args)))
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(make-instance 'db-engine
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:params params :config config
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:connect #'(lambda ()
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(apply #'dbi:connect-cached db-type conn-args)))))
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