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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: HUNCHENTOOT; Base: 10 -*-
;;; Copyright (c) 2004-2010, Dr. Edmund Weitz. All rights reserved.
;;; 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 :hunchentoot)
(defmacro with-log-stream ((stream-var destination lock) &body body)
"Helper macro to write log entries. STREAM-VAR is a symbol that
will be bound to the logging stream during the execution of BODY.
DESTINATION is the logging destination, which can be either a pathname
designator of the log file, a symbol designating an open stream or NIL
if no logging should be done. LOCK refers to the lock that should be
held during the logging operation. If DESTINATION is a pathname, a
flexi stream with UTF-8 encoding will be created and bound to
STREAM-VAR. If an error occurs while writing to the log file, that
error will be logged to *ERROR-OUTPUT*.
Note that logging to a file involves opening and closing the log file
for every logging operation, which is overall costly. Web servers
with high throughput demands should make use of a specialized logging
function rather than relying on Hunchentoot's default logging
facility."
(with-unique-names (binary-stream)
(with-rebinding (destination)
(let ((body body))
`(when ,destination
(with-lock-held (,lock)
(etypecase ,destination
((or string pathname)
(with-open-file (,binary-stream ,destination
:direction :output
:element-type 'octet
:if-does-not-exist :create
:if-exists :append
#+:openmcl :sharing #+:openmcl :lock)
(let ((,stream-var (make-flexi-stream ,binary-stream :external-format +utf-8+)))
,@body)))
(stream
(let ((,stream-var ,destination))
(prog1 (progn ,@body)
(finish-output ,destination)))))))))))
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