100 lines
3 KiB
Common Lisp
100 lines
3 KiB
Common Lisp
;;;; cl-scopes/config
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;;;; Utilities for configuration of scopes services.
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(defpackage :scopes/config
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(:use :common-lisp)
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(:export #:base #:root #:*root*
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#:env-data #:env-keys #:env-prefix #:env-path
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#:actions #:add #:add-action #:children #:env-slots
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#:name #:setup #:parent #:shutdown))
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(in-package :scopes/config)
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;;;; common base class for all config classes
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(defclass common ()
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((children :accessor children
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:initarg children
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:initform nil)))
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(defgeneric parent (cfg)
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(:method ((cfg common)) nil))
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;;;; config root (top-level) class with no parent
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(defvar *root* nil)
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(defclass root (common)
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((env-keys :reader env-keys
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:initarg :env-keys
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:initform nil)
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(env-prefix :reader env-prefix
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:initarg :env-prefix
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:initform "SCOPES_")
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(env-path :reader env-path
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:initarg :env-path
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:initform nil)
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(env-data :accessor env-data
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:initform (make-hash-table))))
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(defmethod initialize-instance :after ((cfg root) &key &allow-other-keys)
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(let* ((data (env-data cfg))
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(prefix (env-prefix cfg))
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(ep (env-path cfg))
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(dotenv-data (if ep (dotenv:read-env ep))))
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(dolist (sl (env-keys cfg))
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(let* ((key (str:concat prefix (string sl)))
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(env-val (uiop:getenv key))
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(dotenv-val (if dotenv-data (gethash key dotenv-data))))
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(if env-val
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(setf (gethash sl data) env-val)
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(setf (gethash sl data) dotenv-val))))))
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(defun root (&rest params &key (class 'root) &allow-other-keys)
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(setf *root* (apply #'make-instance class params)))
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;;;; config base class
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(defclass base (common)
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((env-slots :reader env-slots :initform nil :allocation :class)
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(name :reader name :initarg :name)
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(parent :reader parent :initarg :parent)
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(setup :reader setup :initarg :setup :initform #'(lambda (cfg)))
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(shutdown :reader shutdown :initarg :shutdown :initform #'(lambda (ctx)))
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(actions :accessor actions :initarg :actions :initform nil)))
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(defmethod initialize-instance :after ((cfg base) &key parent &allow-other-keys)
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(when parent
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(push cfg (children parent))
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(env-override cfg)))
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(defmethod (setf parent) ((cfg base) (parent common))
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(push cfg (children parent))
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(env-override cfg))
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(defmethod env-data ((cfg base))
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(env-data (parent cfg)))
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(defun add (name &rest params
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&key (class 'base) (parent *root*)
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&allow-other-keys)
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(apply #'make-instance class :parent parent :name name params))
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(defun add-action (cfg pattern handler &rest params)
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(if params
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(setf handler #'(lambda (ctx msg) (apply handler ctx msg params))))
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(push (list pattern handler) (actions cfg)))
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;;;; utility functions
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(defun hash-to-slots (ht obj slots)
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(if ht
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(dolist (sl slots)
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(let* ((key (intern (string sl) :keyword))
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(val (gethash key ht)))
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(if val
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(setf (slot-value obj sl) val))))))
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(defun env-override (cfg)
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(hash-to-slots (env-data cfg) cfg (env-slots cfg)))
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