Add: configuration from file for datastore & lzb server

This defaults to looking for a file called config.lisp within the dnd
system's directory. If you copy the config.lisp.example included in
this commit out to simply config.lisp, then you should be able to run
the (start) defun to get things running with "sane" defaults. It
should create a datastore directory within the same system directory,
which is also ignored by git.

7 files changed, 45 insertions, 13 deletions

diff --git a/.gitignore b/.gitignore
index 10da9f7..6fa036f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 *~
 /bin/
+/config.lisp
+/dnd-store/
diff --git a/config.lisp.example b/config.lisp.example
new file mode 100644
index 0000000..c1be431
--- /dev/null
+++ b/config.lisp.example
@@ -0,0 +1,3 @@
+(:datastore-directory #P"/home/projects/dnd/dnd-store/"
+ :host "localhost"
+ :port 8888)
diff --git a/src/dnd.lisp b/src/dnd.lisp
index 952b8fe..70edd7d 100644
--- a/src/dnd.lisp
+++ b/src/dnd.lisp
@@ -2,16 +2,23 @@
 
 (in-package #:dnd)
 
+(defvar *config* nil
+  "Instance of the config class globally available.")
+
 (defvar *dnd-arena* nil
   "The instance of the HTTP server")
 
-(defun start ()
-  (init-db)
+(defun start (&optional config-path)
+  "Configures and initializes the datastore and web server, then starts the server."
+  (setf *config* (config-from-file (or config-path
+				       (asdf:system-relative-pathname "dnd" "config.lisp"))))
+  (init-db *config*)
   (setf *dnd-arena* (lzb:create-server))
   (lzb:install-app *dnd-arena* (lzb:app 'dnd))
   (lzb:start-server *dnd-arena*))
 
 (defun boot ()
+  "Main entrypoint for an executable version of DND."
   (swank:create-server :port 9876 :dont-close t)
   (start)
   (loop (sleep 1)))
diff --git a/src/endpoints.lisp b/src/endpoints.lisp
index 62d70ee..acc62c9 100644
--- a/src/endpoints.lisp
+++ b/src/endpoints.lisp
@@ -116,11 +116,11 @@ functions in url parameters in endpoint definitions."
                     (new-sesh player)))
 	(lzb:set-response-cookie
          +session-cookie-name+ (session-id sesh)
-	 :path "/" :domain "localhost")  ; TODO: generalize domain
+	 :path "/" :domain (host *config*))
 	(redirect-to "/tavern"))
       (progn
         (flash :tavern-door (format nil "Hrmm... ~a you say? It ain't on the register." nick))
-        (redirect-to "/tavern-door"))))  )
+        (redirect-to "/tavern-door")))))
 
 (defendpoint* :get "/join" () ()
   (render (page-render-mode) :join))
diff --git a/src/flash.lisp b/src/flash.lisp
index b655fa0..f737d86 100644
--- a/src/flash.lisp
+++ b/src/flash.lisp
@@ -43,8 +43,7 @@ expires."
     ;; set the cookie, updating its expiration if necessary 
     (lzb:set-response-cookie
      +flash-cookie-name+ key
-     ;; TODO: generalize domain
-     :path "/" :domain "localhost" 
+     :path "/" :domain (host *config*)
      :expires (+ +flash-value-lifetime+ now))))
 
 
diff --git a/src/init.lisp b/src/init.lisp
index 68b2a16..d7636a6 100644
--- a/src/init.lisp
+++ b/src/init.lisp
@@ -2,11 +2,28 @@
 
 (in-package #:dnd)
 
-(defun init-db (&optional config)
+;;; CONFIGURATION
+
+(defvar *config* nil)
+
+(defclass/std config ()
+  ((datastore-directory :ir :std #P"/srv/dnd/store/")
+   (swank-port :std nil :doc "If set, swank is started on this port.")
+   (host :std "0.0.0.0")
+   (port :ir :std 8888)))
+
+(defun config-from-file (path)
+  "PATH should be a path to a file containing a PLIST suitable for
+   passing as the keyword arguments to (MAKE-INSTANCE 'CONFIG ...)"
+  (apply #'make-instance 'config (read-from-file path)))
+
+;;; DATASTORE
+
+(defun init-db (config)
+  "Initializes the data store with values from the CONFIG."
+  (ensure-directories-exist (datastore-directory config))
   (unless (boundp 'db:*store*)
-    (unless config
-        nil                             ; TODO: handle the case where we have a config
-        (make-instance
-         'db:mp-store
-         :directory (merge-pathnames "dnd-store/" (user-homedir-pathname))
-         :subsystems (list (make-instance 'db:store-object-subsystem))))))
+    (make-instance
+     'db:mp-store
+     :directory (datastore-directory config)
+     :subsystems (list (make-instance 'db:store-object-subsystem)))))
diff --git a/src/utilities.lisp b/src/utilities.lisp
index 539ad28..3852399 100644
--- a/src/utilities.lisp
+++ b/src/utilities.lisp
@@ -70,3 +70,7 @@
 (eval-when (:compile-toplevel :load-toplevel :execute)
  (defun starts-with-vowel-p (string)
    (find (elt string 0) "aeiou" :test #'char-equal)))
+
+(defun read-from-file (path)
+  (read-from-string
+   (alexandria:read-file-into-string path)))