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conn.lisp
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conn.lisp
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;;;; ichiran db connection manager
(in-package #:ichiran/conn)
;; main connection
(defvar *connection* nil) ;; '("jmdict" "postgres" "" "localhost"))
;; the "dynamic connection" feature assumes the database itself doesn't change, just the connection parameters
;; set the environment variable to the desired value of *connection* for example:
;;
;; export ICHIRAN_CONNECTION='("jmdict" "postgres" "" "localhost" :use-ssl :yes)'
;;
(defvar *connection-env-var* "ICHIRAN_CONNECTION" "dynamic connection setting, an environment variable that contains the value for *connection*")
(defvar *is-dynamic-connection* nil "set to true when loading connection from environment variable, disables keep-connection")
;; secondary connections (alist)
(defvar *connections* '((:a "jmdict2" "postgres" "" "localhost")
(:b "jmdict3" "postgres" "" "localhost")))
(defvar *debug* nil "Enables debug printouts")
(load (asdf:system-relative-pathname :ichiran "settings.lisp") :if-does-not-exist nil)
(register-sql-operators :2+-ary (:=== "IS NOT DISTINCT FROM"))
(register-sql-operators :2+-ary (:=/= "IS DISTINCT FROM"))
(defun get-spec (dbid)
(cond ((not dbid) *connection*)
((listp dbid) dbid)
(t (let ((spec (cdr (assoc dbid *connections*))))
(if spec spec
(error "Invalid connection!"))))))
(defmacro let-db (dbid &body body)
`(let ((*connection* (get-spec ,dbid)))
,@body))
(defvar *conn-vars* nil)
(defvar *conn-var-cache* (make-hash-table :test 'equal))
(defmacro def-conn-var (name initial-value &rest args)
`(progn
(defvar ,name ,initial-value ,@args)
(pushnew (cons ',name ,initial-value) *conn-vars* :key 'car)))
(defmacro with-db (dbid &body body)
(alexandria:with-gensyms (pv-pairs var vars val vals iv key exists)
`(let* ((*connection* (get-spec ,dbid))
(,pv-pairs (when ,dbid
(loop for (,var . ,iv) in *conn-vars*
for ,key = (cons ,var *connection*)
for (,val ,exists) = (multiple-value-list (gethash ,key *conn-var-cache*))
collect ,var into ,vars
if ,exists collect ,val into ,vals
else collect ,iv into ,vals
finally (return (cons ,vars ,vals))))))
(progv (car ,pv-pairs) (cdr ,pv-pairs)
(unwind-protect
(with-connection *connection*
,@body)
(loop for ,var in (car ,pv-pairs)
for ,key = (cons ,var *connection*)
do (setf (gethash ,key *conn-var-cache*) (symbol-value ,var))))))))
(defun switch-conn-vars (dbid)
(setf *connection* (get-spec dbid))
(loop
for (var . iv) in *conn-vars*
for key = (cons var *connection*)
for (val exists) = (multiple-value-list (gethash key *conn-var-cache*))
for value = (if exists val iv)
do (setf (symbol-value var) value)))
(def-conn-var *test-var* 10)
(defun load-settings (&key keep-connection)
(let ((old-connection *connection*)
(old-dynamic *is-dynamic-connection*))
(load (asdf:system-relative-pathname :ichiran "settings.lisp") :if-does-not-exist nil)
(load-connection-from-env)
(if (and keep-connection old-connection (not *is-dynamic-connection*) (not old-dynamic))
(setf *connection* old-connection)
(unless (or (equal old-connection *connection*) (and old-dynamic *is-dynamic-connection*))
(switch-conn-vars *connection*)))))
(defmacro with-log ((path &key (if-exists :append)) &body body)
(alexandria:with-gensyms (stream)
`(with-open-file (,stream ,path :direction :output :if-does-not-exist :create :if-exists ,if-exists)
(let ((cl-postgres:*query-log* ,stream))
,@body))))
(defclass cache ()
((mapping :initform nil :allocation :class)
(name :initarg :name :reader cache-name)
(var :initarg :var :reader cache-var)
(lock :reader cache-lock)
))
(defmethod initialize-instance :after ((cache cache) &key &allow-other-keys)
(let* ((name (cache-name cache))
(old-cache (getf (slot-value cache 'mapping) name)))
(setf (slot-value cache 'lock)
(if old-cache
(cache-lock old-cache)
(sb-thread:make-mutex :name (symbol-name name))))
(setf (getf (slot-value cache 'mapping) name) cache)))
(defun all-caches ()
(slot-value (sb-mop:class-prototype (find-class 'cache)) 'mapping))
(defun get-cache (name)
(getf (all-caches) name))
(defgeneric init-cache (cache-name)
(:documentation "Should return a value to initialize cache with"))
(defgeneric reset-cache (cache-name)
(:method (cache-name)
(let ((val (init-cache cache-name))
(cache (get-cache cache-name)))
(sb-thread:with-mutex ((cache-lock cache))
(setf (symbol-value (cache-var cache)) val)))))
(defgeneric ensure (cache-name)
(:method (cache-name)
(let ((cache (get-cache cache-name)))
(or (symbol-value (cache-var cache))
(sb-thread:with-mutex ((cache-lock cache))
(or (symbol-value (cache-var cache))
(let ((val (init-cache cache-name)))
(setf (symbol-value (cache-var cache)) val))))))))
(defmacro defcache (name var &body init-body)
(alexandria:with-gensyms (cache-var)
`(progn
(def-conn-var ,var nil)
(make-instance 'cache :name ',name :var ',var)
(defmethod init-cache ((,cache-var (eql ,name)))
(with-connection *connection*
,@init-body)))))
(defun init-all-caches (&optional reset)
(loop with fn = (if reset 'reset-cache 'ensure)
for (name) on (all-caches) by #'cddr
do (funcall fn name)))
(defun dp (value &key (fn 'print))
(when *debug*
(funcall fn value))
value)
(defun get-ichiran-connection-env ()
(when *connection-env-var*
(let ((connection-str (uiop:getenv *connection-env-var*)))
(when (and connection-str (not (zerop (length connection-str))))
(let* ((*read-eval* nil)
(connection (ignore-errors (read-from-string connection-str))))
(if connection
(if (listp connection)
connection
(warn "Invalid connection value in ~a, must be a list" *connection-env-var*))
(warn "Unable to parse connection value in ~a" *connection-env-var*)))))))
(defun load-connection-from-env ()
(let ((ichiran-connection (get-ichiran-connection-env)))
(if ichiran-connection
(setf *connection* ichiran-connection
*is-dynamic-connection* t)
(setf *is-dynamic-connection* nil))))