/usr/share/common-lisp/source/memstore/memcache/memcache.lisp is in cl-memstore 1.1.0-1.
This file is owned by root:root, with mode 0o644.
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;;; Copyright (c) 2006, Abhijit 'quasi' Rao. All rights reserved.
;;; Copyright (c) 2006, Cleartrip Travel Services.
;;; Copyright (c) 2011 Kevin Rosenberg
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(in-package #:memcache)
(defmethod print-object ((mc memcache) stream)
(print-unreadable-object (mc stream :type t :identity t)
(format stream "~A on ~A:~A ~AMB"
(when (slot-boundp mc 'name) (name mc))
(when (slot-boundp mc 'host) (host mc))
(when (slot-boundp mc 'port) (port mc))
(when (and (slot-boundp mc 'memcached-server-storage-size)
(numberp (slot-value mc 'memcached-server-storage-size)))
(/ (memcached-server-storage-size mc) 1024 1024)))))
(defmethod initialize-instance :after ((memcache memcache) &rest initargs)
(declare (ignore initargs))
(setf (slot-value memcache 'pool) (make-instance 'memcache-connection-pool
:name (concatenate 'simple-string (name memcache) " - Connection Pool")
:max-capacity (pool-size memcache)))
(handler-case (mc-pool-init :memcache memcache)
(error () nil))
(let ((stats (handler-case (mc-stats :memcache memcache)
(error () nil))))
(if stats
(setf (slot-value memcache 'memcached-server-storage-size) (mc-stats-limit-maxbytes stats))
(setf (slot-value memcache 'memcached-server-storage-size) -1))))
(defun make-memcache-instance (&key (host "127.0.0.1") (port 11211)
(name "Memcache") (pool-size 5))
"Creates an instance of class MEMCACHE which represents a memcached server."
(make-instance 'memcache :name name :host host :port port :pool-size pool-size))
(defmacro with-pool-maybe ((stream memcache use-pool) &body body)
"Macro to wrap the use-pool/dont-use-pool stuff and the cleanup
around a body of actual action statements"
(let ((mc (gensym "MEMCACHE-"))
(up (gensym "USE-POOL-"))
(us (gensym "USOCKET-")))
`(let* ((,mc ,memcache)
(,up ,use-pool)
(,us (if ,up
(if *pool-get-trys?*
(mc-get-from-pool-with-try :memcache ,mc)
(mc-get-from-pool :memcache ,mc))
(mc-make-pool-item :memcache ,mc))))
(unwind-protect
(when ,us
(let ((,stream (usocket:socket-stream ,us)))
(handler-case
(progn ,@body)
(error (c)
(when ,up
(mc-chuck-from-pool ,us ,mc))
(error c)))))
(if ,up
(mc-put-in-pool ,us :memcache ,mc)
(ignore-errors (usocket:socket-close ,mc)))))))
(defun write-string-bytes (string stream)
(loop for char across string
do (write-byte (char-code char) stream)))
(defun send-mc-command (s &rest args &aux started)
(dolist (arg args)
(unless (null arg)
(if started
(write-byte (char-code #\space) s)
(setq started t))
(typecase arg
#+nil (keyword (if (eq :no-reply arg)
(write-string-bytes "noreply" s)
(write-string-bytes (string-downcase
(symbol-name arg)) s)))
(string (write-string-bytes arg s))
(character (write-byte (char-code arg) s))
(t (write-string-bytes (princ-to-string arg) s)))))
(write-string-bytes +crlf+ s)
(force-output s))
;;;
;;;
;;; Memcached API functionality
;;;
;;;
(defun mc-store (key data &key (memcache *memcache*) ((:command command) :set) ((:exptime exptime) 0)
((:use-pool use-pool) *use-pool*) (cas-unique) (flags 0)
no-reply)
"Stores data in the memcached server using the :command command.
key => key by which the data is stored. this is of type SIMPLE-STRING
data => data to be stored into the cache. data is a sequence of type (UNSIGNED-BYTE 8)
length => size of data
memcache => The instance of class memcache which represnts the memcached we want to use.
command => The storage command we want to use. There are 3 available : set, add & replace.
exptime => The time in seconds when this data expires. 0 is never expire."
(declare (type fixnum exptime) (type simple-string key))
(when (and (eq command :cas) (not (integerp cas-unique)))
(error "CAS command, but CAS-UNIQUE not set."))
(let ((len (length data)))
(with-pool-maybe (s memcache use-pool)
(send-mc-command
s
(ecase command
(:set "set")
(:add "add")
(:replace "replace")
(:append "append")
(:prepend "prepend")
(:cas "cas"))
key flags exptime len (when (eq command :cas) cas-unique) (when no-reply "noreply"))
(write-sequence data s)
(send-mc-command s)
(if no-reply
(values)
(read-crlf-line s)))))
(defun mc-get (key-or-keys &key (memcache *memcache*) (use-pool *use-pool*)
(command :get))
"Retrive value for key from memcached server.
keys-list => is a list of the keys, seperated by whitespace, by which data is stored in memcached
memcache => The instance of class memcache which represnts the memcached we want to use.
Returns a list of lists where each list has three elements key, flags, and value
key is of type SIMPLE-STRING
value is of type (UNSIGNED-BYTE 8)"
(let* ((multp (listp key-or-keys))
(keys-list (if multp key-or-keys (list key-or-keys)))
(res
(with-pool-maybe (s memcache use-pool)
(apply 'send-mc-command s (ecase command
(:get "get")
(:gets "gets"))
keys-list)
(loop for x = (read-crlf-line s)
until (string-equal x "END")
collect (let* ((status-line (delimited-string-to-list x))
(flags (parse-integer (third status-line)))
(len (parse-integer (fourth status-line)))
(cas-unique (when (eq command :gets)
(parse-integer (fifth status-line))))
(seq (make-sequence '(vector (unsigned-byte 8)) len)))
(read-sequence seq s)
(read-crlf-line s)
(if (eq command :gets)
(list (second status-line) flags seq cas-unique)
(list (second status-line) flags seq)))))))
(if multp
res
(car res))))
(defun mc-del (key &key (memcache *memcache*) ((:time time) 0) (use-pool *use-pool*) (no-reply))
"Deletes a particular 'key' and it's associated data from the memcached server"
(declare (type fixnum time))
(with-pool-maybe (s memcache use-pool)
(send-mc-command s "delete" key time (when no-reply "noreply"))
(if no-reply
(values)
(read-crlf-line s))))
(defun incr-or-decr (cmd key delta memcache use-pool no-reply)
(declare (type fixnum delta))
(let* ((res (with-pool-maybe (s memcache use-pool)
(send-mc-command s cmd key delta (if no-reply "noreply"))
(if no-reply
(values)
(read-crlf-line s))))
(int (unless no-reply
(ignore-errors (parse-integer res)))))
(or int res)))
(defun mc-version (&key (memcache *memcache*) (use-pool *use-pool*))
(let* ((raw (with-pool-maybe (s memcache use-pool)
(send-mc-command s "version")
(read-crlf-line s)))
(split (delimited-string-to-list raw)))
(when (string-equal (first split) "VERSION")
(second split))))
(defun mc-verbosity (v &key (memcache *memcache*) (use-pool *use-pool*) (no-reply))
(declare (type integer v))
(let ((res (with-pool-maybe (s memcache use-pool)
(send-mc-command s "verbosity" v (when no-reply "noreply"))
(if no-reply
(values)
(read-crlf-line s)))))
res))
(defun mc-flush-all (&key (time nil) (memcache *memcache*) (use-pool *use-pool*) (no-reply))
(declare (type (or null integer) time))
(let ((res (with-pool-maybe (s memcache use-pool)
(if time
(send-mc-command s "flush_all" time (when no-reply "noreply"))
(send-mc-command s "flush_all" (when no-reply "noreply")))
(if no-reply
(values)
(read-crlf-line s)))))
res))
(defun mc-incr (key &key (memcache *memcache*) (delta 1) (use-pool *use-pool*) (no-reply))
"Implements the INCR command. Increments the value of a key.
Please read memcached documentation for more information.
key is a string
delta is an integer"
(incr-or-decr "incr" key delta memcache use-pool no-reply))
(defun mc-decr (key &key (memcache *memcache*) (delta 1) (use-pool *use-pool*) (no-reply))
"Implements the DECR command. Decrements the value of a key.
Please read memcached documentation for more information."
(incr-or-decr "decr" key delta memcache use-pool no-reply))
(defun mc-stats-raw (&key (memcache *memcache*) (use-pool *use-pool*) args
&aux results)
"Returns Raw stats data from memcached server to be used by the mc-stats function"
(with-pool-maybe (s memcache use-pool)
(send-mc-command s "stats" args)
(with-output-to-string (str)
(loop for line = (read-crlf-line s)
do (push line results)
until (or (string-equal "END" line)
(string-equal "ERROR" line)))))
(nreverse results))
(defun mc-get-stat (key stats)
(when (stringp key) (setq key (ensure-keyword key)))
(get-alist key (mc-stats-all-stats stats)))
;;; Collects statistics from the memcached server
(defun mc-stats (&key (memcache *memcache*) (use-pool *use-pool*))
"Returns a struct of type memcache-stats which contains internal statistics from the
memcached server instance. Please refer to documentation of memcache-stats for detailed
information about each slot"
(let* ((result (mc-stats-raw :memcache memcache :use-pool use-pool))
(split (loop with xx = nil
for x in result
do (setf xx (delimited-string-to-list x))
when (and (string= (first xx) "STAT") (second xx))
collect (cons (second xx) (third xx))))
(all-stats (sort split (lambda (a b) (string-greaterp (car a) (car b)))))
(results))
(dolist (r all-stats)
(push (cons (ensure-keyword (car r))
(let* ((val (cdr r))
(int (ignore-errors (parse-integer val)))
(float (unless int (ignore-errors (parse-float val)))))
(cond
((integerp int) int)
((numberp float) float)
(t val))))
results))
(make-memcache-stats
:all-stats results
:pid (get-alist :pid results)
:uptime (get-alist :uptime results)
:time (get-alist :time results)
:version (get-alist :version results)
:rusage-user (get-alist :rusage_user results)
:rusage-system (get-alist :rusage_system results)
:curr-items (get-alist :curr_items results)
:curr-items-total (get-alist :curr_items_tot results)
:curr-connections (get-alist :curr_connections results)
:total-connections (get-alist :total_connections results)
:connection-structures (get-alist :connection_structures results)
:cmd-get (get-alist :cmd_get results)
:cmd-set (get-alist :cmd_set results)
:get-hits (get-alist :get_hits results)
:get-misses (get-alist :get_misses results)
:bytes-read (get-alist :bytes_read results)
:bytes-written (get-alist :bytes_written results)
:limit-maxbytes (get-alist :limit_maxbytes results)
)))
;;; Error Conditions
(define-condition memcached-server-unreachable (error)
((error :initarg :error)))
(define-condition memcache-pool-empty (error)
())
(define-condition cannot-make-pool-object (error)
((error :initarg :error)))
(define-condition bad-pool-object (error)
())
;;;
;;;
;;; Memcached Pooled Access
;;;
;;;
(defclass memcache-connection-pool ()
((name
:initarg :name
:reader name
:initform "Connection Pool"
:type simple-string
:documentation "Name of this pool")
(pool
:initform (make-queue)
:accessor pool)
(pool-lock
:reader pool-lock
:initform (make-lock "Memcache Connection Pool Lock"))
(max-capacity
:initarg :max-capacity
:reader max-capacity
:initform 2
:type fixnum
:documentation "Total capacity of the pool to hold pool objects")
(current-size
:accessor current-size
:initform 0)
(currently-in-use
:accessor currently-in-use
:initform 0
:type fixnum
:documentation "Pool objects currently in Use")
(total-uses
:accessor total-uses
:initform 0
:documentation "Total uses of the pool")
(total-created
:accessor total-created
:initform 0
:type fixnum
:documentation "Total pool objects created")
(pool-grow-requests
:initform 0
:accessor pool-grow-requests
:type fixnum
:documentation "Pool Grow Request pending Action")
(pool-grow-lock
:initform (make-lock "Pool Grow Lock")
:reader pool-grow-lock))
(:documentation "A memcached connection pool object"))
(defmethod print-object ((mcp memcache-connection-pool) stream)
(print-unreadable-object (mcp stream :type t :identity t)
(format stream "Capacity:~d, Currently in use:~d"
(when (slot-boundp mcp 'max-capacity) (max-capacity mcp))
(when (slot-boundp mcp 'currently-in-use) (currently-in-use mcp)))))
(defun mc-put-in-pool (conn &key (memcache *memcache*))
(with-lock-held ((pool-lock (pool memcache)))
(enqueue (pool (pool memcache)) conn)
(decf (currently-in-use (pool memcache)))))
(defun mc-get-from-pool (&key (memcache *memcache*))
"Returns a pool object from pool."
(let (pool-object (state t))
(with-lock-held ((pool-lock (pool memcache)))
(if (queue-empty-p (pool (pool memcache)))
(setf state nil)
(progn (incf (currently-in-use (pool memcache)))
(incf (total-uses (pool memcache)))
(setf pool-object (dequeue (pool (pool memcache)))))))
(if state
pool-object
(error 'memcache-pool-empty))))
(defun mc-get-from-pool-with-try (&key (memcache *memcache*) (tries 5) (try-interval 1))
""
(let ((tr 1))
(loop
(progn (when (> tr tries)
(return nil))
(let ((conn (handler-case (mc-get-from-pool :memcache memcache)
(memcache-pool-empty () nil))))
(if (not conn)
(progn (incf tr)
(warn "memcache ~a : Connection Pool Empty! I will try again after ~d secs." (name memcache) try-interval)
(process-sleep try-interval))
(return conn)))))))
(defun mc-pool-init (&key (memcache *memcache*))
"Cleans up the pool for this particular instance of memcache
& reinits it with POOL-SIZE number of objects required by this pool"
(mc-pool-cleanup memcache)
(dotimes (i (pool-size memcache))
(mc-pool-grow-request memcache))
(mc-pool-grow memcache))
(defun mc-make-pool-item (&key (memcache *memcache*))
(handler-case (usocket:socket-connect (host memcache) (port memcache) :element-type '(unsigned-byte 8))
(usocket:socket-error (e) (error 'memcached-server-unreachable :error e))
(error (e) (error 'cannot-make-pool-object :error e))))
(defun mc-pool-grow (memcache)
(let (grow-count pool-item-list)
(with-lock-held ((pool-grow-lock (pool memcache)))
(setf grow-count (pool-grow-requests (pool memcache)))
(setf pool-item-list (remove nil (loop for x from 1 to grow-count
collect (mc-make-pool-item :memcache memcache))))
(loop for x from 1 to (length pool-item-list)
do (with-lock-held ((pool-lock (pool memcache)))
(enqueue (pool (pool memcache)) (pop pool-item-list))
(incf (total-created (pool memcache)))
(incf (current-size (pool memcache))))
do (decf (pool-grow-requests (pool memcache)))))))
(defun mc-destroy-pool-item (pool-item)
(ignore-errors (usocket:socket-close pool-item)))
(defun mc-pool-grow-request (memcache)
(with-lock-held ((pool-grow-lock (pool memcache)))
(if (> (max-capacity (pool memcache)) (+ (current-size (pool memcache))
(pool-grow-requests (pool memcache))))
(incf (pool-grow-requests (pool memcache)))
(warn "memcache: Pool is at capacity."))))
(defun mc-chuck-from-pool (object memcache)
(mc-destroy-pool-item object)
(with-lock-held ((pool-lock (pool memcache)))
(decf (current-size (pool memcache))))
#|(loop while (mc-pool-grow-request memcache))
(mc-pool-grow memcache)|#
(mc-pool-init :memcache memcache))
(defun mc-pool-cleanup (memcache)
(with-lock-held ((pool-lock (pool memcache)))
(with-lock-held ((pool-grow-lock (pool memcache)))
(loop
when (queue-empty-p (pool (pool memcache)))
do (return)
else do (mc-destroy-pool-item (dequeue (pool (pool memcache)))))
(setf (current-size (pool memcache)) 0
(currently-in-use (pool memcache)) 0
(pool-grow-requests (pool memcache)) 0
(total-created (pool memcache)) 0
(total-uses (pool memcache)) 0))))
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