source: branches/home/psmith/restructure/src/nio-logger/nio-logger.lisp

#|
Copyright (c) 2007
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. 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.
3. The name of the author may not be used to endorse or promote products
   derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 :nio-logger)

(declaim (optimize (debug 3) (speed 3) (space 0)))



(defmacro with-line-from-tailed-file ((line filename delay) &rest body)
  `(with-open-file (in ,filename :direction :input)
     (loop for ,line = (read-line in nil nil) do
          (if ,line
              (progn ,@body)
              (progn
;               (format t "read nil~%")
                (sleep ,delay))))))


(defun callback(result)
#+nio-debug  (nio-utils:format-log t "Result of remote-log ~A~%" result)
)


;;Tail the given log and write to remote logger
;;e.g. (tail-log "/var/log/httpd/access_log" "192.168.1.1")
(defun tail-log(filename ip-address)
  (sleep 4)
  (nio:add-connection (nio:node ip-address 16323))
  (with-line-from-tailed-file (text filename 1)
    (let ((rpc (format nil "(nio-logger:remote-log \"~A\")" (cl-base64:string-to-base64-string text))))
#+nio-debug      (nio-utils:format-log t "nio-logger::tail-log Submitting job~A~%" rpc)
      (nio:with-connected-nodes (node)
#+nio-debug     (nio-utils:format-log t "Toplevel sending ~A to ~A~%" rpc node)
        (nio-yarpc:remote-execute (nio:active-conn node) rpc #'callback)))))

;Runs a multithreaded system with an IO thread dealing with IO only and a 'job'  thread taking and executing jobs

(defparameter +log-file-name+ "./out")

(defun run-logging-server(listen-ip out-file &optional (allowed-ips "ips.txt"))
  (setf  +log-file-name+ out-file)
  (nio:load-ips allowed-ips)
  (sb-thread:make-thread #'(lambda()(nio:start-server 'nio-yarpc:yarpc-state-machine :host listen-ip :port 16323 :accept-connection 'nio:check-ip)) :name "nio-server")
  (loop
    ;;block waiting for jobs
     (nio-yarpc:run-job)))

(nio-yarpc:defremote remote-log(base64-str)
  (with-open-file (out +log-file-name+ :direction :output :if-exists :append)
    (nio-utils:format-log out "~A~%" (cl-base64:base64-string-to-string base64-str)))
  t)