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feat(lisp): Implement configuration loading

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Adds configuration loading from a file located at either
"/etc/gemma/config.lisp" or a path determined via the `GEMMA_CONFIG`
environment variable.

The configuration file can contain any number of deftask forms and a
single config form which determines the location at which Gemma stores
its data and also the port on which it should listen.
This commit is contained in:
Vincent Ambo 2017-12-26 11:05:16 +01:00
parent db0e74fbd0
commit 4536e65471
1 changed files with 33 additions and 18 deletions
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51
src/gemma.lisp
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@ -10,16 +10,44 @@
(defpackage gemma
(:use :cl
:local-time
:cl-json))
:cl-json)
(:import-from :sb-posix :getenv)
(:shadowing-import-from :sb-posix :getcwd))
(in-package :gemma)
;; TODO: Store an average of how many days it was between task
;; completions. Some of the current numbers are just guesses
;; anyways.
(defmacro in-case-of (x &body body)
"Evaluate BODY if X is non-nil, binding the value of X to IT."
`(let ((it ,x))
(when it ,@body)))
;; Set default configuration parameters
(defvar *gemma-port* 4242
"Port on which the Gemma web server listens.")
(defun initialise-persistence (data-dir)
(defvar *p-tasks*
(cl-prevalence:make-prevalence-system data-dir)
"All tasks registered in this Gemma instance.")
;; Initialise database ID counter
(or (> (length (cl-prevalence:find-all-objects *p-tasks* 'task)) 0)
(cl-prevalence:tx-create-id-counter *p-tasks*)))
(defun config (&key port data-dir)
"Configuration function for use in the Gemma configuration file."
(in-package :gemma)
(in-case-of port (defparameter *gemma-port* it))
(initialise-persistence (or data-dir "data/")))
;;
;; Define task management system
;;
(defclass task ()
((id :reader id
:initarg :id)
@ -44,23 +72,6 @@
:initarg :done-at
:accessor last-done-at)))
(defvar *gemma-port*
(parse-integer (or (sb-posix:getenv "GEMMA_PORT") "4242"))
"Port on which the Gemma web server should listen.")
(defvar *gemma-data-dir*
(pathname (or (sb-posix:getenv "GEMMA_DATA_DIR")
(sb-posix:getcwd)))
"Directory in which to store Gemma data.")
(defvar *p-tasks*
(cl-prevalence:make-prevalence-system *gemma-data-dir*)
"All tasks registered in this Gemma instance.")
;; Initialise database ID counter
(or (> (length (cl-prevalence:find-all-objects *p-tasks* 'task)) 0)
(cl-prevalence:tx-create-id-counter *p-tasks*))
(defmacro deftask (task-name days &optional description)
(unless (get-task task-name)
`(progn (cl-prevalence:tx-create-object
@ -110,6 +121,10 @@ maximum interval."
(:remaining . ,(days-remaining task))))
(defun start-gemma ()
;; Load configuration
(load (pathname (or (getenv "GEMMA_CONFIG")
"/etc/gemma/config.lisp")))
;; Set up web server
(hunchentoot:start (make-instance 'hunchentoot:easy-acceptor :port *gemma-port*))