View and Rank Trains

John Hurst

Version 0.1.0

Table of Contents

1 Overview
1.1 Define Global Constants
2 viewtrains.py Main Body
2.1 Initialisation
2.1.1 Imports
2.1.2 Define Global Constants
2.1.3 Define Regular Expression Patterns
2.1.4 Define Subroutines
2.2 Supporting Code
2.2.1 collect cgi parameters
2.2.2 Collect Previous Rankings
2.2.3 print header of html page
2.2.4 Print Trailer of HTML Page
2.3 Define Subroutines
2.3.1 define function convertIPtoHex
2.3.2 define procedure log
2.3.3 Determine rank of image
2.3.4 Define the XML Dispatch Routines
2.3.5 define procedure to display the image
2.3.6 Define Procedure to Search Directories
3 ranktrains.py
3.1 ranktrains: define constants
3.2 ranktrains: collect cgi parameters
3.3 ranktrains: collect previous ranking information
3.4 ranktrains: Update Rankings with Latest Log Info
3.5 rankings: Print Forward and Backward Buttons
3.6 ranktrains: Generate Image Rankings
3.7 ranktrains: print rankings table
3.8 ranktrains: Print Ranking Analysis
4 tidytrains.py
5 ranking.py
6 rank.py
6.1 rank: define the strtotime function
6.2 rank: define rankdata procedure
6.3 rank: define ranklog procedure
7 TO DO
8 Indices
8.1 Identifier Index
8.2 Chunk Index
8.3 File Index


1. Overview

This document describes various python cgi scripts for viewing the author's railway photograph collection. The collection is held in a database (directory plus sub-directories) that can be accessed from a variety of web pages (see for example, my school server page). There are two main scripts, one to view an image at full resolution, and one to view the popularity rankings of the images. Other scripts described here help in maintaining the system.

The first script defined is <viewtrains.py 2.1>. This script takes a single parameter, which is the short name of an image, and searches the database for that image, and then renders it at full resolution, along with data about the image retrieved from the associated XML file.

The other main script is <ranktrains.py 3.1>, which delivers a page of thumbnail images in order of popularity. Because of the large number of images, each such page delivers only a few of the total number of images, but buttons are included to navigate around the complete rankings.

<tidytrains.py 4.1> reorganizes the ranking files. It reads two files to determine current rankings. The first file contains a single entry for each image, containing the current voting score, and the second file contains a list of votes since then. This ranking is then used to determine if any images should be removed from the system, depending upon whether or not their rank is less than some threshold.

<ranking.py 5.1,5.2> reads two files to determine current rankings. The first file contains a single entry for each image, containing the current voting score, and the second file contains a list of votes since then. A third file is then constructed, containing the updated rankings.

<rank.py 6.1> provides three procedures (strtotime, rankdata, ranklog) for other programs.

1.1 Define Global Constants

<define global constants 1.1> =
(year, month, day, hour, minute, second, weekday, yday, DST) = \ time.localtime(time.time()) debug=1 <determine server environment 1.5> EXTN=".xml"
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<globals for macosx 1.2> =
CGIBIN="http://%s/~ajh/cgi-bin" % (server) HOMEPAGE="http://%s/~ajh" % (server) BASEPAGE="/home/ajh/www" LOGFILE="/home/ajh/local/%s/logs" % host
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<globals for solaris 1.3> =
CGIBIN="http://www.csse.monash.edu.au/~ajh/cgi-bin" HOMEPAGE="http://www.csse.monash.edu.au/~ajh" BASEPAGE="/u/web/homes/ajh" LOGFILE=BASEPAGE+"/logs"
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<globals for linux 1.4> =
CGIBIN="http://%s/~ajh/cgi-bin" % (server) HOMEPAGE="http://%s/~ajh" % (server) BASEPAGE="/home/ajh/www" LOGFILE="/home/ajh/local/%s/logs" % host
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<determine server environment 1.5> =
# determine which host/server environment if os.environ.has_key("SERVER_NAME"): server=os.environ["SERVER_NAME"] elif os.environ.has_key("HOST"): server=os.environ["HOST"] else: p=Popen(['hostname'],stdout=PIPE) server=p.communicate()[0] MacOSX='MacOSX' ; Solaris='Solaris' ; Linux="Linux" if server in ["www.csse.monash.edu.au","nexus"]: host='csse' ; ostype='Solaris' ; system=Solaris elif server in ["njhurst.com","www.njhurst.com",\ "ajhurst.org","www.ajhurst.org",\ 'chairsabs.org.au','www.chairsabs.org.au']: host='sequoia' ; ostype='Linux' ; system=Linux elif server in ['bittern.local','bittern']: host='bittern' ; ostype='MacOSX' ; system=MacOSX elif server in ['murtoa.local','murtoa']: host='murtoa' ; ostype='MacOSX' ; system=MacOSX elif server=='dimboola.infotech.monash.edu.au': host='dimboola' ; ostype='MacOSX' ; system=MacOSX elif server in ['ajh.id.au','www.ajh.id.au','10.0.0.105']: host='rainbow' ; ostype='MacOSX' ; system=MacOSX elif server=='localhost': if os.environ.has_key('HOST'): host=os.environ['HOST'] else: host='localhost' ostype='MacOSX' ; system=MacOSX else: host=system=ostype='unknown' print "I don't know this host: %s<BR/>" % server if system==MacOSX: <globals for macosx 1.2> elif system==Solaris: <globals for solaris 1.3> elif system==Linux: <globals for linux 1.4> else: print "Unknown system %s<BR/>" % (system) sys.exit(1)
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2. viewtrains.py Main Body

"viewtrains.py" 2.1 =
#!/usr/bin/python # DO NOT EDIT THIS FILE! # use ~/Computers/python/viewtrains/viewtrains.xlp instead <imports 2.2> <define constants for viewtrains 2.3,2.7> <define regular expression patterns 2.4> <define subroutines 2.5> print "Content-Type: text/html\n\n"; #print "

TEST MESSAGE!

\n" <collect cgi parameters 2.6> <collect previous rankings 2.8> htmltitle="Full size image of "+imageparm <print header of html page 2.9,2.10,2.11,2.12,2.13> if imageisrelative: display(imageparm) else: res=visit(top,0,imageparm) scriptnameparm="viewtrains.py?image=%s" % (escimageparm) <print trailer of html page 2.14>

The main work of this script is done in one of the two procedures display and visit, depending upon whether the user offered a relative image path or not.

Somewhat contradictory to normal usage, a relative path refers to the location of the image relative to the base trains directory, rather than the root directory, hence the terminology. A non-relative path simply gives the image name, and hence a full directory search must be carried out in order to locate the image.

2.1 Initialisation

2.1.1 Imports

<imports 2.2> =
import cgi import os import datetime import math import rank from rank import DECAY import re import string from subprocess import Popen,PIPE import sys import time import urllib from xml.dom.minidom import parse, parseString, Node
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2.1.2 Define Global Constants

<define constants for viewtrains 2.3> =
<define global constants 1.1> tm = "%4d%02d%02d:%02d%02d" % (year, month, day, hour, minute) SCRIPT=CGIBIN+"/viewtrains.py" SCRIPTIMAGE=SCRIPT+"?image=" top=BASEPAGE+"/trains" now=datetime.datetime.now() startnow=datetime.datetime.now() today=startnow.strftime("%Y%m%d")
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2.1.3 Define Regular Expression Patterns

<define regular expression patterns 2.4> =
ignoredirs = re.compile('(tmp)|(units)')
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2.1.4 Define Subroutines

<define subroutines 2.5> =
<define function convertIPtoHex 2.15> <define procedure log 2.16> <define the ranking procedure 2.17> <define the XML dispatch routines 2.20> <define procedure to display the image 2.21> <define procedure to search directories 2.26>
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These procedures are of sufficient significance that they have been moved to a separate section.

2.2 Supporting Code

2.2.1 collect cgi parameters

<collect cgi parameters 2.6> =
form = cgi.FieldStorage() #print form #print cgi.print_environ() ipadr=convertIPtoHex(os.getenv("REMOTE_ADDR")) gotparms=0; dontlog=0 #print "QUERY_STRING=",os.getenv("QUERY_STRING"),"<BR/>" #print "USER_AGENT=",os.getenv("USER_AGENT"),"<BR/>" if form.has_key("image"): imageparm=form["image"].value gotparms=1 res=re.match('([^.]+).jpg$',imageparm) if res: imageparm=res.group(1) res=re.match('^trains/',imageparm) if res: imageisrelative=1 else: imageisrelative=0 if form.has_key("disablevote"): dontlog=1 if not gotparms: print "<H1>Error!</H1>" print "<P>You are using a browser which has not passed in the ", print "cgi parameters ", print "correctly. Please use a different browser that does ", print "handle parameters properly. ", print "(Mozilla, Safari, Epiphany, Firefox are known to work).</P>" print "<P>Alternatively, type the name of an image into the following box and click submit/hit enter</P>" print " <p></p>\n" print " <form action=\"%s/viewtrains.py\" method=\"post\">\n" % (cgiserver) print " <input type=\"submit\" value=\"submit\"/>" print " <input type=\"text\" size=\"30\" name=\"image\" value=\"%s\"/>" % ("") print " </form>" sys.exit(0) escimageparm=urllib.quote(imageparm)
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Use the Python library to retrieve cgi parameters. Currently there only one, image, which is the name of an image in the train library. Two alternatives are available:

  1. The parameter starts with "trains/", in which case it is a relative pathname into the trains directory, and no searching is required; or
  2. It does not, in which case the name must be searched against the image library to find the required image.
The choice between these two is flagged in the variable imageisrelative.

Discard any ".jpg" suffix.

Escape any suspect URL parameter characters.

<define constants for viewtrains 2.7> =
cgiserver="http://localhost/cgi-bin/ajh"
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2.2.2 Collect Previous Rankings

All previous rankings have been reduced to a single vote value for each image. These values are stored in a file RANKINGS, together with the date and time of the rankings. These votes are exponentially decayed, and used as the base values for any additional votes cast since that date.

<collect previous rankings 2.8> =
RANKINGS=LOGFILE+"/trainrank" VIEWINGS=LOGFILE+"/trainview" totalimages, datatime, votefactor, table = rank.rankdata(RANKINGS)
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2.2.3 print header of html page

This code prints the header part of the html page.

<print header of html page 2.9> =
print """ <html> <head>
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print the starting lines, then ...

<print header of html page 2.10> =
<title>""", print htmltitle, print """</title>
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print the page title,including the "MONASH UNIVERSITY", "INFORMATION TECHNOLOGY" and "Clayton School" parts.

<print header of html page 2.11> =
<base href=\""""+HOMEPAGE+"""/"/> <link rel="stylesheet" HREF="styles/monash.css" type="text/css" /> </head> <body> <div id="global-header"> <div id="global-images"> <table width="100%" bgcolor="white"> <tr width="100%"> <td align="left"> <table> <tr> <td align="left"> <a href="http://www.monash.edu.au"> <span style="font-family:sans-serif;font-size:+160%;font-weight:bold; background-color:#ffffff;color:black"> MONASH UNIVERSITY </span> </a> </td> </tr> <tr> <td align="left"> <a href="http://www.infotech.monash.edu.au" COLOR="black"> <span style="font-family:sans-serif;font-size:+140%;font-weight:bold; background-color:#ffffff;color:black">INFORMATION TECHNOLOGY</span> </a> </td> </tr> <tr> <td align="left"> <a href="http://www.csse.monash.edu.au" COLOR="black"> <span style="font-family:sans-serif;font-size:+120%; font-weight:bold;background-color:#ffffff;color:black"> Clayton School</span> </a> </td> </tr> </table> </td> <td align="right"> """,
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Generate the trains image on the trains page. We do this from the list of available images in web/images/banner (added manually to this list), by choosing one indexed by the low order bits of the current microsecond, that is, pseudo-randomly.

<print header of html page 2.12> =
rightnow=datetime.datetime.now() locos=["R707-1.jpg", "6029-32.jpg", "4472=R761-11.jpg",\ "621-16.jpg", "F255-1.jpg", "5910-4.jpg",\ "3813-5.jpg", "5112+5910-4a.jpg","W933-8.jpg",\ "520-6.jpg", "3203-3.jpg", "3642-1.jpg",\ "Rx207-15.jpg", "38=D3+K=R-3.jpg", "D3-639+R707-1.png",\ "J549-21.jpg", "5367-2.jpg", "W22-1.png",\ "3813-5a.jpg", "tgv-13.jpg", "S300-1.jpg",\ "4472=R761-11.jpg","6029-6.jpg", "Callington-1.jpg",\ "NYCHudson-1.jpg", "R711-3.jpg", "MerddinEmrys-2.jpg",\ "3801+3813+3820-2.jpg"] loco=locos[rightnow.microsecond % len(locos)] print "<img align=\"right\" SRC=\"images/banner/" + loco, print "\" height=\"79\" alt=\"steam loco " + loco + "\"\/>",
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Now complete the final part of the header. A warning message about using Internet Explorer is also added, as that application is not W3C compliant.

<print header of html page 2.13> =
print """ </td> </tr> </table> </div> <div class="spacer"></div> <table style="background-color:#339933;border-top:1px solid #000000" width="100%" id="global-nav" summary="Layout for site-wide navigation"> <tr> <td valign="center"> <div style="font-size:+140%;margin-left:1em"> <a HREF="index"""+EXTN+"""">JOHN HURST</a> Warning: This page works with any browser EXCEPT Internet Explorer! <xsl:copy-of select="$GlobalNavBar"/> </div> </td> </tr> </table> <!-- U T I L I T Y N A V I G A T I O N --> <table style="background-color:#3c6;color:#fff;vertical-align:middle; text-align: right" width="100%" id="global-utils" summary="Layout for utility navigation"> <tr> <td align="left"> <a HREF="position/index"""+EXTN+"""">Position</a> | <a HREF="research/index"""+EXTN+"""">Research</a> | <a HREF="teaching/index"""+EXTN+"""">Teaching</a> | <a HREF="admin/index"""+EXTN+"""">Administration</a> | <a HREF="professional/index"""+EXTN+"""">Professional</a> | <a HREF="personal/index"""+EXTN+"""">Personal</a> | <a HREF="trains/index"""+EXTN+"""">Railways</a> | <a HREF=\""""+CGIBIN+"""/train-map.py">Site map</a> </td> </tr> </table> <TABLE WIDTH="100%" BGCOLOR="#fff" CELLSPACING="0" CELLPADDING="0"> <TR><TD COLOR="#ffffff" BGCOLOR="#33cc66" COLSPAN="40" ALIGN="center"> <B>Central Shunting Yard</B></TD></TR> <TR> <TD ALIGN="center" BGCOLOR="silver" COLSPAN="3">Main</TD> <TD ALIGN="center" BGCOLOR="lightgreen" COLSPAN="7">Australia</TD> <TD ALIGN="center" BGCOLOR="lightpink" COLSPAN="3">Miscellaneous</TD> <TD ALIGN="center" BGCOLOR="lightblue" COLSPAN="5">Rest of World</TD> </TR><TR> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/./index"""+EXTN+""""> <IMG SRC="trains/./trains.gif" ALT="Main Railway Page" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/new/index"""+EXTN+""""> <IMG SRC="trains/new/trains.gif" ALT="The Latest Additions" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/pops/index"""+EXTN+""""> <IMG SRC="trains/pops/thumb/ajh.gif" ALT="The Most Popular Images" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"> <A HREF="trains/anr/index"""+EXTN+""""> <IMG SRC="trains/anr/trains.gif" ALT="Australian National Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/nsw/index"""+EXTN+""""> <IMG SRC="trains/nsw/trains.gif" ALT="New South Wales Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/qld/index"""+EXTN+""""> <IMG SRC="trains/qld/trains.gif" ALT="Queensland Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/sa/index"""+EXTN+""""> <IMG SRC="trains/sa/trains.gif" ALT="South Australian Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/tas/index"""+EXTN+""""> <IMG SRC="trains/tas/trains.gif" ALT="Tasmanian Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/vic/index"""+EXTN+""""> <IMG SRC="trains/vic/trains.gif" ALT="Victorian Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/wa/index"""+EXTN+""""> <IMG SRC="trains/wa/trains.gif" ALT="West Australian Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/misc/index"""+EXTN+""""> <IMG SRC="trains/misc/trains.gif" ALT="Miscellaneous Railway Items" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/private/index"""+EXTN+""""> <IMG SRC="trains/private/trains.gif" ALT="Private Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/tourist/index"""+EXTN+""""> <IMG SRC="trains/tourist/trains.gif" ALT="Tourist and Preservation" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/./rest"""+EXTN+""""> <IMG SRC="trains/./thumb/rest.gif" ALT="African/Asian Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/br/index"""+EXTN+""""> <IMG SRC="trains/br/trains.gif" ALT="British Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/europe/index"""+EXTN+""""> <IMG SRC="trains/europe/trains.gif" ALT="Continental European Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/nz/index"""+EXTN+""""> <IMG SRC="trains/nz/trains.gif" ALT="New Zealand Railways" HEIGHT="30" WIDTH="30"></A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/usa/index"""+EXTN+""""> <IMG SRC="trains/usa/trains.gif" ALT="North American Railways" HEIGHT="30" WIDTH="30"></A></TD> </TR><TR> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/./index"""+EXTN+"""">Central</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/new/index"""+EXTN+"""">Latest</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/pops/index"""+EXTN+"""">VoxPop</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/anr/index"""+EXTN+"""">ANR</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/nsw/index"""+EXTN+"""">NSW</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/qld/index"""+EXTN+"""">QLD</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/sa/index"""+EXTN+"""">SA</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/tas/index"""+EXTN+"""">TAS</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/vic/index"""+EXTN+"""">VIC</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/wa/index"""+EXTN+"""">WA</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/misc/index"""+EXTN+"""">Misc</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/private/index"""+EXTN+"""">Private</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/tourist/index"""+EXTN+"""">Tourist</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/./rest"""+EXTN+"""">Rest</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/br/index"""+EXTN+"""">BR</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/europe/index"""+EXTN+"""">Europe</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/nz/index"""+EXTN+"""">NZ</A></TD> <TD ALIGN="center" BGCOLOR="white"><A HREF="trains/usa/index"""+EXTN+"""">US&amp;</A></TD> </TR> </TABLE></div>"""
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2.2.4 Print Trailer of HTML Page

<print trailer of html page 2.14> =
print """ <HR SIZE="4" NOSHADE="on" COLOR="#339"/> <TABLE width="100%" align="center" border="0" cellspacing="0" cellpadding="0"> <TR><TD height="10"></TD></TR> <TR> <TD>This page maintained by John Hurst. <BR/> Copyright <A HREF="http://www.adm.monash.edu.au/unisec/pol/itec12.html"> Monash University Acceptable Use Policy </A> </TD> <TD><xsl:copy-of select="$GlobalCounter"/></TD> <TD ALIGN="right" ROWSPAN="2"> <IMG VALIGN="bottom" SRC="images/MadeOnMac.gif"/> <A HREF="index"""+EXTN+""""> <IMG ALIGN="center" height="50" width="33" SRC="family/john9808.gif" alt="My Photo"/></A> <A HREF="trains/index"""+EXTN+""""> <IMG ALIGN="center" height="50" width="33" SRC="images/train.gif" alt="Train Photo"/></A> </TD> </TR> <TR> <TD ALIGN="left" valign="bottom" COLSPAN="3"> <SPAN STYLE="font-size:80%"> <P> Dynamically generated at """+\ tm+"""\ <BR/> Maintainer use only; not generally accessible: <!-- **** NB! The "localhost" in the following MUST be split to avoid being converted for other server contexts -->""" ind=' ' print ind+'<A href="http://local'+'host/~ajh/cgi-bin/'+scriptnameparm+'">Local Server</A>' print ind+"<xsl:text>&#x0a;</xsl:text>" print ind+'<A href="http://www.ajh.id.au/~ajh/cgi-bin/'+scriptnameparm+'">Home Server</A>' print ind+"<xsl:text>&#x0a;</xsl:text>" print ind+'<A href="http://www.ajhurst.org/~ajh/cgi-bin/'+scriptnameparm+'">Hurst Server</A>' print ind+"<xsl:text>&#x0a;</xsl:text>" print ind+'<A href="http://dimboola.infotech.monash.edu.au/~ajh/cgi-bin/'+scriptnameparm+'">' print ind+'Work Server</A>' print ind+"<xsl:text>&#x0a;</xsl:text>" print ind+'<A href="http://www.csse.monash.edu.au/cgi-bin/cgiwrap/ajh/'+scriptnameparm+'">' print ind+'CSSE Server</A>' print """ <xsl:text>&#x0a;</xsl:text> </P> </SPAN> </TD> </TR> </TABLE> </body> </html> """
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2.3 Define Subroutines

2.3.1 define function convertIPtoHex

<define function convertIPtoHex 2.15> =
def convertIPtoHex(ipadrDec): ipadrHex=ipadrDec res=re.match(r'(\d+)\.(\d+)\.(\d+)\.(\d+)',ipadrDec) if res: d1=int(res.group(1)) d2=int(res.group(2)) d3=int(res.group(3)) d4=int(res.group(4)) ipadrHex = "%02x%02x%02x%02x" % (d1,d2,d3,d4) return ipadrHex
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The logic of this function is simple enough: extract the integer (decimal) values of each field in an IP address, and convert each to a two-digit hexadecimal value. Concatenate all these into a single hex string, which is returned.

2.3.2 define procedure log

<define procedure log 2.16> =
def log(ipadr,image,acc,ok): global dontlog if dontlog: return access="" if not acc: refer = os.getenv("HTTP_REFERRER") access=" *** not served *** (ref: %s)" % (refer) elif not ok: access=" *** already voted ***" try: f=open(VIEWINGS,'a') except: print "Cannot open logfile %s" % (VIEWINGS) f.write("%s %s %s%s\n" % (tm,ipadr,image,access)) f.close() #print "<P>Logged %s %s</P>" % (tm,image)
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Every image access is logged, for recording its popularity. The exceptions are where there is an explicit request not to log (dontlog is true), and where there is some problem in delivering the image.

2.3.3 Determine rank of image

<define the ranking procedure 2.17> =
logentrypat=\ re.compile("(\d{4})(\d{2})(\d{2}):(\d{2})(\d{2}) "+\ "([0-9a-f\.:]+ )?trains/(.*)$") <define getrank routine 2.18>
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<define getrank routine 2.18> =
def getrank(path,imageparm): global ipadr res=re.match(r'trains/(.*)$',imageparm) if res: imageparm=res.group(1) ok=1 notserved=re.compile(".*\*\*\* .* \*\*\*") res=re.match('.*trains/(.*)$',path) if res: path=res.group(1) try: data=open(VIEWINGS) except: print "Cannot open logfile %s" % (VIEWINGS) sys.exit(1) for l in data.readlines(): res=notserved.match(l) if res: continue <getrank: extract data from a single logfile entry 2.19> pass if ok: if table.has_key(imageparm): if not dontlog: table[imageparm]+=1.0 # add one for this viewing! else: table[imageparm]=1.0 # add one for this viewing! list=[] for key in sorted(table.keys()): list.append((table[key],key)) #print "%f %s" % (table[key],key) sortlist=sorted(list,reverse=True) totalimages=len(sortlist) i=1; last=0.0; rank=1; thisrank=0 for (n,k) in sortlist: if last!=n: rank=i #print "%4d %2.6f %s<BR/>" % (rank,n,k) i+=1 last=n if k==path: thisrank=rank break return (totalimages,thisrank,ok)
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Match the various fields in a logfile entry. These are the year, month, day, hour and minute of the entry (in the format YYYYMMDD:hhmm), followed by the IP address (now stored in hexadecimal, but originally in decimal, and before that, not at all), and then the image address, including the base directory trains/, which is stripped off. Note that any logging of whether the image actually was served, or had already been voted upon, has been discarded previously.

<getrank: extract data from a single logfile entry 2.19> =
res=logentrypat.match(l) if res: logdate=l[0:8] year=int(res.group(1)) month=int(res.group(2)) day=int(res.group(3)) hour=int(res.group(4)) minute=int(res.group(5)) accesstime = datetime.datetime(year,month,day,hour,minute) timesinceaccess=now-accesstime dayssinceaccess=timesinceaccess.days+timesinceaccess.seconds/86400.0 expval=-dayssinceaccess/DECAY voteval=math.exp(expval) #print "%1.4f %2.6f %2.5f" % (voteval,expval,dayssinceaccess) thisipadr=res.group(6) if thisipadr: thisipadr=thisipadr.strip() imagename=res.group(7) #print "%s %s %s : %s %s <%s> %s" % \ # (year,month,day,hour,minute,thisipadr,imagename) if table.has_key(imagename): table[imagename]+=voteval else: table[imagename]=voteval if thisipadr==ipadr and imagename==imageparm and logdate==today: ok = 0
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2.3.4 Define the XML Dispatch Routines

<define the XML dispatch routines 2.20> =
def doname(elem,path): if elem.firstChild: text=elem.firstChild.nodeValue pathsplit=re.match(BASEPAGE+'/(.*)/([^/]*)$',path) if pathsplit: pathbase=pathsplit.group(1) pathfile=pathsplit.group(2) dirattr=elem.getAttribute('dir') dir="" if dirattr: dir=dirattr page="" pageattr=elem.getAttribute('page') if pageattr: url=pathbase+'/'+pageattr+EXTN+'#'+pathfile page=pageattr else: url=pathbase+'/index'+EXTN+'#'+pathfile print "<LI><I>name:</I> <A HREF=\"%s\">%s</A> dir=%s page=%s</LI>" % (url,text,dir,page) else: print "<LI><I>name:</I> %s</LI>" % (text) def dothumb(elem,path): pass #text=elem.firstChild.nodeValue #print "<LI><I>thumb:</I> %s</LI>" % text def dosize(elem,path): bytes=pixels="" print "%s" % (elem) attrs=elem.attributes for i in range(attrs.length): attr = attrs.item(i) if attr.name=='bytes': bytes=attr.value if attr.name=='pixels': pixels=attr.value print "<LI><I>size:</I> %s bytes, %s pixels</LI>" % (bytes,pixels) def dodate(elem,path): taken=catalogued="" attrs=elem.attributes for i in range(attrs.length): attr = attrs.item(i) if attr.name=='taken': taken=attr.value if attr.name=='catalogued': catalogued=attr.value print "<LI><I>date:</I> taken: %s, catalogued %s</LI>" % (taken,catalogued) def dophotographer(elem,path): text=elem.firstChild.nodeValue print "<LI><I>photographer:</I> %s</LI>" % text def doindex(elem,path): if elem.firstChild: text=elem.firstChild.nodeValue print "<LI><I>index terms:</I> %s</LI>" % text def totext(node,path): if node.nodeType==node.TEXT_NODE: return node.nodeValue elif node.nodeType==node.ELEMENT_NODE: text='' for n in node.childNodes: text=text+totext(n,path) if node.tagName=='narrower': return "<DIV style=\"margin-left:20;font-style:italic\">%s</DIV>" % text elif node.tagName=='uri': attributes=node.attributes for i in range(attributes.length): attr = attributes.item(i) if attr.name=='href': href=attr.value return "<A HREF=\"%s\">%s</A>" % (href,text) elif node.tagName=='p': return "<P>%s</P>" % (text) elif node.tagName=='b': return "<B>%s</B>" % (text) elif node.tagName=='i': return "<I>%s</I>" % (text) elif node.tagName=='em': return "<EM>%s</EM>" % (text) elif node.tagName=='dq': return "\"%s\"" % (text) elif node.tagName=='description': return text else: return "&amp;lt;%s>%s&amp;lt;/%s>" % (node.tagName,text,node.tagName) elif node.childNodes: text='' for n in node.childNodes: text=text+totext(n,path) return text else: return "**unknown node**" def dodescription(elem,path): text=totext(elem,path) print "<LI><I>description:</I> %s</LI>" % text dispatch={'name':doname, 'thumb':dothumb, 'size':dosize, 'date':dodate, 'photographer':dophotographer, 'index':doindex, 'description':dodescription}
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2.3.5 define procedure to display the image

This is the procedure that does most of the real work in displaying the full image.

<define procedure to display the image 2.21> =
def display(image): global totalimages,imageparm path=top[0:len(top)-6]+image xmlfile=path+EXTN jpgfile=path+".jpg" acc=os.access(jpgfile,os.R_OK) pathsplit=re.match(BASEPAGE+'/(.*)/([^/]*)$',path) if pathsplit: pathbase=pathsplit.group(1) pathfile=pathsplit.group(2) if acc: <display can access file 2.22> else: <display cannot access file 2.23> #print '<P><A href="%s">Go to %s</A></P>' % (image,image) (totalimages,rank,ok)=getrank(path,imageparm) log(ipadr,image,acc,ok) startrank = 25 * ((rank-1) / 25) print <Print ranking information 2.25> if not ok: print '<P>You have already voted for this image today!</P>\n' return
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<display can access file 2.22> =
#print "<P>%s,%08x</P>" % (jpgfile,acc) print "<IMG SRC=\"%s\"/>" % (image+".jpg") print "<LI><I>file:</I> %s </LI>" % (xmlfile) dom=parse(xmlfile) elems=dom.getElementsByTagName('image').item(0).childNodes for n in elems: if n.nodeType == Node.ELEMENT_NODE: #print n.tagName if dispatch.has_key(n.tagName): dispatch[n.tagName](n,path)
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The file to display is accessible, so generate the HTML reference to it, print the name of the XML file, then parse it in order to display the various attributes relating to the image (as defined in the XML file).

<display cannot access file 2.23> =
if pathsplit: gifpath=pathbase+'/thumb/'+pathfile+'.gif' gifacc=os.access(BASEPAGE+'/'+gifpath,os.R_OK) else: gifacc=False #print "<P>%s,%08x</P>" % (jpgfile,acc) print "<P><B>The file %s is not available</B>" % (jpgfile) if gifacc: print '<IMG SRC="'+gifpath+'"/></P>' print '<P>The image has been removed for space reasons. ' print 'It will be retrieved overnight.</P>' else: print "</P>" res=re.match(".*/([^/]*)$",path) name="Sorry" if res: name=res.group(1) print <Explain missing images 2.24>
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<Explain missing images 2.24> =
""" <P>This may be because the file has been relocated to a different location. Try clicking this link to search the website: <FORM action=\""""+SCRIPT+"""\" method=\"post\" name=\"image\"> <INPUT type=\"submit\" name=\"image\" value=\"%s\"><IMG SRC="%s"/></INPUT> </FORM> If that does not work, it may be that the image has been removed for space reasons. Sorry. """ % (name,gifpath)
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<Print ranking information 2.25> =
""" <FORM action=\""""+CGIBIN+"""/ranktrains.py" method="post"> <INPUT type="hidden" name="number" value="25"/> <P>This image ranks %d out of %d <BUTTON type="submit" name="startnum" value="%d">%04d-%04d</BUTTON> </P> </FORM> """ % (rank,totalimages,startrank,startrank+1,startrank+25)
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2.3.6 Define Procedure to Search Directories

The procedure visit is called when we have an image name, but no path to the image. The procedure recursively visits all directories reachable from the initial parameter dir, and if it finds the image, calls display to perform the actual display of the image. It then returns. Thumbnail directories are skipped. It is assumed that the initial dir parameter contains the substring trains/, indicating where the trains subdirectory begins.

<define procedure to search directories 2.26> =
def visit(dir,level,image): list = os.listdir(dir) for f in list: if f == 'thumb': continue path = dir + "/" + f if f == image+'.jpg': res=re.match('(.*)(trains/[^.]*)\.jpg',path) if res: display(res.group(2)) return 1 if os.path.isdir(path): res=visit(path,level+2,image) if res: return 1 return 0
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3. ranktrains.py

ranktrains.py is a web script that delivers pages of rankings for the railway database. Each page is limited in size (currently 25 images), and there are navigation buttons to browse forwards and backwards through the rankings. Images are buttons that take the viewer to the full-size image (via viewtrains), while image titles are links that take the viewer to the home page of the image.

"ranktrains.py" 3.1 =
#!/usr/bin/python # DO NOT EDIT THIS FILE! # use ~/Computers/python/viewtrains/viewtrains.xlp instead import re,string,sys,datetime import cgi,os import time import urllib import math import rank from xml.dom.minidom import parse, parseString, Node print "Content-Type: text/html\n\n"; <ranktrains: define constants 3.2> print "<base href=\""+HOMEPAGE+"/\"><BR/>\n" if debug: print "CGIBIN=%s<BR/>" % (CGIBIN) print "HOMEPAGE=%s<BR/>" % (HOMEPAGE) print "BASEPAGE=%s<BR/>" % (BASEPAGE) print "LOGFILE=%s<BR/>" % (LOGFILE) #print "=%s" % () #print "=%s" % () <ranktrains: collect cgi parameters 3.3> <ranktrains: collect previous ranking information 3.4> <ranktrains: update rankings with latest log info 3.5> htmltitle="Dynamic Rankings" <print header of html page 2.9,2.10,2.11,2.12,2.13> <rankings: print forward and backward buttons 3.6> <ranktrains: generate image rankings 3.7> <rankings: print forward and backward buttons 3.6> <ranktrains: print rankings table 3.8> <ranktrains: print ranking analysis 3.9> scriptnameparm="ranktrains.py" <print trailer of html page 2.14>

3.1 ranktrains: define constants

This macro is also defined in other sections.

<ranktrains: define constants 3.2> =
<define global constants 1.1> tm = time.asctime(time.localtime(time.time())) + ["", "(Daylight savings)"][DST] SCRIPT=CGIBIN+"/ranktrains.py"
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3.2 ranktrains: collect cgi parameters

<ranktrains: collect cgi parameters 3.3> =
form = cgi.FieldStorage() gotparms=0 numtodisplay=25; startnum=0 if form.has_key("number"): numtodisplay=int(form["number"].value) gotparms=1 if form.has_key("startnum"): startnum=int(form["startnum"].value) gotparms=1 stopnum=startnum+numtodisplay if debug: print "numtodisplay = %d, startnum = %d" % (numtodisplay,startnum)
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3.3 ranktrains: collect previous ranking information

<ranktrains: collect previous ranking information 3.4> =
RANKINGS=LOGFILE+"/trainrank" VIEWINGS=LOGFILE+"/trainview" totalimages, datatime, votefactor, table = rank.rankdata(RANKINGS) if debug: print "totalimages=%s<br/>" % (totalimages) print "datatime=%s<br/>" % (datatime) print "votefactor=%s<br/>" % (votefactor) print "table=%s<br/>" % (table)
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3.4 ranktrains: Update Rankings with Latest Log Info

<ranktrains: update rankings with latest log info 3.5> =
logentrypat=\ re.compile("(\d{4})(\d{2})(\d{2}):(\d{2})(\d{2}) "+\ "([0-9a-f\.:]+ )?(trains/)?(.*)$") notserved=re.compile(".*\*\*\* .* \*\*\*") totalimages, logcount, ranktime, sorttime, sortlist = \ rank.ranklog(VIEWINGS,table,notserved) if debug: print "totalimages=%s<br/>" % (totalimages) print "logcount=%s<br/>" % (logcount) print "ranktime=%s<br/>" % (ranktime) print "sorttime=%s<br/>" % (sorttime) print "sortlist=%s<br/>" % (sortlist)
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3.5 rankings: Print Forward and Backward Buttons

<rankings: print forward and backward buttons 3.6> =
print "<FORM action=\""+CGIBIN+"/ranktrains.py\" method=\"post\">\n" print "<table align=\"center\"><tr>\n" print "<INPUT type=\"hidden\" name=\"number\" value=\"%d\"/>" % (numtodisplay) if startnum-numtodisplay>=0: print "<td><BUTTON type=\"submit\" name=\"startnum\" " print "value=\"%d\">Prev (%d-%d)</BUTTON></td>" % \ (startnum-numtodisplay,startnum-numtodisplay+1,startnum) else: print "<td><BUTTON type=\"submit\">(Prev)</BUTTON></td>" print "<td><BUTTON type=\"submit\" name=\"startnum\" " print "value=\"%d\">Next (%d-%d)</BUTTON></td>" % \ (startnum+numtodisplay,startnum+numtodisplay+1,startnum+2*numtodisplay) print "</tr></table>\n" print "</FORM>\n"
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3.6 ranktrains: Generate Image Rankings

<ranktrains: generate image rankings 3.7> =
print "<H1>Image Rankings %d - %d</H1>\n" % (startnum+1,stopnum) print "<FORM action=\""+CGIBIN+"/viewtrains.py\" " print "method=\"post\" name=\"image\"><table align=\"center\">\n" perline=5; posonline=0 i=1; last=0.0; rank=1 for (n,k) in sortlist: #print "%1.4f %s <BR/>" % (n,k) #(n,k) = sortlist[i] if last!=n: rank=i if i>startnum: if posonline==0: print "<tr>\n" res=re.match("(.*)/([^/]*)",k) path="" ; image="" if res: path=res.group(1) image=res.group(2) else: image=k caption=k if len(caption)>17: caption=path+"<BR/>"+image try: xmlfname=BASEPAGE+"/trains/"+path+"/"+image+".xml" xmlfile = open(xmlfname) dom = parse(xmlfile) nameelem=dom.getElementsByTagName('name').item(0) pageattr=nameelem.getAttributeNode('page') if pageattr: page=pageattr.nodeValue else: page='index' xmlfile.close() print "<td align=\"center\">" print "<table><tr><td>%4d</td>" % (rank) print "<td align=\"right\">%2.6f</td></tr>" % (n) print "<tr><td colspan=\"2\" align=\"center\">" #print '<INPUT type="hidden" name="disablevote" value="1"/>' print "<BUTTON type=\"submit\" name=\"image\" value=\"trains/%s\">" % (k) print "<IMG align=\"center\" ALT=\"click me for full image\" " print "SRC=\"trains/%s/thumb/%s.gif\">" % (path,image) print "</BUTTON></td></tr><tr><td colspan=\"2\" align=\"center\">" print "<A HREF=\"trains/%s/%s.xml#%s\">%s</A></td></tr></table></td>" % \ (path,page,image,caption) except IOError: print "<td align=\"center\">" print "<table><tr><td>%4d</td>" % (rank) print "<td align=\"right\">%2.6f</td></tr>" % (n) print "<tr><td colspan=\"2\" align=\"center\">" print "Cannot access<BR/>" print "%s at %s</td></tr></table></td>" % (caption,xmlfname) pass posonline+=1 if posonline==perline: print "</tr>\n" posonline=0 i+=1 if i>stopnum: break last=n print "</table></FORM>\n"
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3.7 ranktrains: print rankings table

<ranktrains: print rankings table 3.8> =
print "<H1>Rankings Images Table</H1>\n" print "<FORM action=\""+CGIBIN+"/ranktrains.py\" method=\"post\">\n" print "<table align=\"center\"><tr>\n" print "<INPUT type=\"hidden\" name=\"number\" value=\"%d\"/>" % (numtodisplay) linecount=0 # compute score from first image (score,key)=sortlist[0] print "<td align=\"left\">%7.4f</td>" % (score) nimages=len(sortlist)-1 for i in range(0,totalimages,numtodisplay): print "<td align=\"center\">" print "<BUTTON type=\"submit\" name=\"startnum\" " print "value=\"%d\">%04d-%04d</BUTTON></td>" % (i,i+1,i+numtodisplay) linecount+=1 # compute score from image number i+numtodisplay j=i+numtodisplay-1 if j > nimages: j = nimages (score,key)=sortlist[j] if linecount % 6 == 2: print "<td align=\"left\">%7.4f</td>" % (score) if linecount % 6 == 4: print "<td align=\"left\">%7.4f</td>" % (score) if linecount % 6 == 0: print "<td align=\"left\">%7.4f</td>" % (score) print "</tr><tr>\n" # compute score from image number i+numtodisplay+1 j=i+numtodisplay if j > nimages: j = nimages (score,key)=sortlist[j] print "<td align=\"left\">%7.4f</td>" % (score) # compute score from last image (score,key)=sortlist[len(sortlist)-1] print "<td align=\"left\">%7.4f</td>" % (score) print "</tr></table>\n" print "</FORM>\n" print """ <P> A full explanation of how these rankings are computed can be found on the <A HREF=\""""+HOMEPAGE+"""/trains/pops/index"""+EXTN+"""">Vox Pops Page</A> </P> """
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3.8 ranktrains: Print Ranking Analysis

<ranktrains: print ranking analysis 3.9> =
print "<H1>Ranking Analysis Data</H1>\n" print '<P>Time analyses based on wallclock times</P>' print 'votefactor=%f ' % (votefactor) + \ '(this is the decay since last rankings were computed)<BR/>' print "Ranking data input took %d.%06d seconds for %d images<BR/>" % \ (datatime.seconds,datatime.microseconds,totalimages) print "Logfile input took %d.%06d seconds for %d entries<BR/>" % \ (datatime.seconds,datatime.microseconds,logcount) print "Input analysis and sorting took %d.%06d seconds<BR/>" % \ (sorttime.seconds,sorttime.microseconds) print "Data ranking took %d.%06d seconds<BR/>" % \ (ranktime.seconds,ranktime.microseconds)
Chunk referenced in 3.1

4. tidytrains.py

read two files to determine current rankings. The first file contains a single entry for each image, containing the current voting score, and the second file contains a list of votes since then. This ranking is then used to determine if any images should be removed from the system, depending upon whether or not their rank is less than some threshold.

"tidytrains.py" 4.1 =
#!/usr/bin/python <imports 2.2> import getopt import shutil <define global constants 1.1> THRESHOLD=0.000170 MASTERDIR=BASEPAGE+'/trains' WEBDIR=BASEPAGE WEBLOG=LOGFILE WEBPAGE=WEBDIR+'/trains/' WEBRANK=WEBLOG+'/trainrank' WEBVIEW=WEBLOG+'/trainview' opts, args = getopt.getopt(sys.argv[1:],"s:f:") #CURRENT=WEBRANK #LOGFILE=WEBVIEW CURRENT=WEBLOG+'/trainrank' LOGFILE=WEBLOG+'/trainview' LISTFILE=WEBLOG+'/trainlist' command="find %s -name \*.jpg >%s" % (MASTERDIR,LISTFILE) status=os.system(command) if status: print "Urrk 2! %d" % (status) sys.exit(status) available=[] avfile=open(LISTFILE) for l in avfile.readlines(): l=l.strip() l=l[11:] # strip off www/trains/ #print ">%s<" % l available.append(l) avfile.close() #os.remove(LISTFILE) oneday=datetime.timedelta(days=1) yesterday=datetime.datetime.now()-oneday starttime=yesterday.strftime("%Y%m%d:000000") finishtime="20201231:235959" for opt,val in opts: print "%s %s" % (opt,val) if opt=='-s': starttime=val elif opt=='-f': finishtime=val else: print "Unknown option %s" % (opt) print "starttime = %s" % (starttime) totalimages, datatime, votefactor, table = rank.rankdata(CURRENT) ignorepat=re.compile(".*\*\*\* [^*]* \*\*\*") totalimages,logcount, ranktime,sorttime,sortlist = \ rank.ranklog(LOGFILE,table,ignorepat,starttime,finishtime) for (val,key) in sortlist: if val<THRESHOLD: #path=WEBPAGE+key+'.jpg' path=SCSSEPAGE+key+'.jpg' if key in available: print 'removing %s (not really)' % (path) #command='ssh -1 nexus.csse.monash.edu.au "rm %s"' % (path) #status=os.system(command) #os.remove(path) else: print '%s already removed' % (path) pass table = {} ignorepat=re.compile(r'.*((-[0-9a-z]+)|(already voted \*\*\*))$') totalimages,logcount, ranktime,sorttime,sortlist = \ rank.ranklog(LOGFILE,table,ignorepat,starttime,finishtime) pathpat=re.compile(r'([^ ]+) ') for (val,key) in sortlist: #print "%s %7.6f" % (key,val) res=pathpat.match(key) if res: path=res.group(1) webpath = MASTERDIR+path+'.jpg' #sitepath = WEBPAGE+path+'.jpg' sitepath = SCSSEPAGE+path+'.jpg' #webacc=os.access(webpath,os.F_OK) #siteacc=os.access(sitepath,os.F_OK) #if webacc: #if siteacc: #pass #else: #print 'cp -p %s %s' % (webpath,sitepath) #shutil.copy2(webpath,sitepath) #else: #if siteacc: #print 'Anomalous: %s exists but %s does not' % (sitepath,webpath) #else: #print 'Cannot recover %s as there is no master copy' % (sitepath) command='/usr/local/bin/rsync -auv %s nexus.csse.monash.edu.au:%s &>/dev/null' % \ (webpath,sitepath) status=os.system(command) if not status: print 'recovered %s' % (sitepath) else: print 'Could NOT recover %s, status:%d' % (sitepath,status) sys.exit(0)

5. ranking.py

"ranking.py" 5.1 =
#!/usr/bin/python # read two files to determine current rankings. The first file # contains a single entry for each image, containing the current # voting score, and the second file contains a list of votes since # then. A third file is then constructed, containing the updated # rankings. # DO NOT EDIT THIS FILE! # use ~/Computers/python/viewtrains/viewtrains.xlp instead import re,string,sys,datetime import cgi,os import getopt import time import urllib import math <define global constants 1.1> tm = time.asctime(time.localtime(time.time())) + ["", "(Daylight savings)"][DST] startnow=datetime.datetime.now() ignoredirs = re.compile('(tmp)|(units)') top=BASEPAGE+"/trains" jpgpat=re.compile(r'(.*)\.jpg$') xmlpat=re.compile(r'.*\.xml$') datepat=re.compile(r'(\d{4})(\d{2})(\d{2}):(\d{2})(\d{2})(\d{2})') def strtotime(str,default): res=datepat.match(str) if res: thisdatetime=datetime.datetime(int(res.group(1)), # year int(res.group(2)), # month int(res.group(3)), # day int(res.group(4)), # hour int(res.group(5)), # minute int(res.group(6))) # second return thisdatetime else: return default opts, args = getopt.getopt(sys.argv[1:],"s:f:") CURRENT=args[0] LOGFILE=args[1] NEW=args[2] starttime="20050101:000000" finishtime="20201231:235959" for opt,val in opts: print "%s %s" % (opt,val) if opt=='-s': starttime=val elif opt=='-f': finishtime=val else: print "Unknown option %s" % (opt) print "%s %s" % (starttime,finishtime) starttime=strtotime(starttime,None) finishtime=strtotime(finishtime,None) print "%s %s" % (starttime,finishtime) currcount=0 currlist=file(CURRENT,"r") table={} DECAY=15.0 currdate=currlist.readline() currdatetime=strtotime(currdate,startnow) timesincelast=startnow-currdatetime dayssincelast=timesincelast.days+timesincelast.seconds/86400.0 expval=-dayssincelast/DECAY votefactor=math.exp(expval) print 'votefactor=%f' % (votefactor) totalimages=0 for l in currlist.readlines(): res=re.match(r'([^ ]+) +([0-9.]+)$',l) if res: lastvote=float(res.group(2)) nowvote=votefactor*lastvote table[res.group(1)]=nowvote else: print 'bad format in %s' % (l) totalimages+=1 currlist.close() datanow=datetime.datetime.now() datatime = datanow-startnow print "Data input took %d.%06d seconds for %d images<BR/>" % \ (datatime.seconds,datatime.microseconds,totalimages) data=open(LOGFILE) pat=re.compile("(\d{4})(\d{2})(\d{2}):(\d{2})(\d{2}) ([0-9a-f\.:]+ )?(trains)?(.*)$")
Chunk defined in 5.1,5.2

20100610:143701 Note that the : in the IP field (group 6) has been added to cope with IPv6 naming conventions.

"ranking.py" 5.2 =
notserved=re.compile(".*\*\*\* [^*]* \*\*\*") logcount=0 for l in data.readlines(): logcount+=1 res=notserved.match(l) if res: continue res=pat.match(l) if res: <ranking: parse and process a ranking entry 5.3> pass ranknow=datetime.datetime.now() ranktime = ranknow-datanow print "Input analysis took %d.%06d seconds for %d entries<BR/>" % \ (ranktime.seconds,ranktime.microseconds,logcount) list=[] for key in sorted(table.keys()): list.append((table[key],key)) sortlist=sorted(list,reverse=True) <ranking: build new ranking list 5.4> <ranking: print closing summary 5.5> sys.exit(0)
Chunk defined in 5.1,5.2
<ranking: parse and process a ranking entry 5.3> =
year=int(res.group(1)) month=int(res.group(2)) day=int(res.group(3)) hour=int(res.group(4)) minute=int(res.group(5)) accesstime = datetime.datetime(year,month,day,hour,minute) #print "%s %s %s" % (accesstime,starttime,finishtime) if accesstime < starttime or accesstime > finishtime: print "ignoring %s" % (l) continue timesinceaccess=startnow-accesstime dayssinceaccess=timesinceaccess.days+timesinceaccess.seconds/86400.0 expval=-dayssinceaccess/DECAY voteval=math.exp(expval) #print "%1.4f %2.6f %2.5f" % (voteval,expval,dayssinceaccess) ipadr=res.group(6) if ipadr: ipadr=ipadr.strip() imagename=res.group(8) res=re.match('(.*)(/[^/.]+/\.\./)(.*)$',imagename) while res: imagename=res.group(1)+'/'+res.group(3) res=re.match('(.*)(/[^/.]+/\.\./)(.*)$',imagename) print imagename imagename=imagename[1:] if table.has_key(imagename): table[imagename]+=voteval else: table[imagename]=voteval
Chunk referenced in 5.2
<ranking: build new ranking list 5.4> =
currlist=file(NEW,"w") currlist.write('%04d%02d%02d:%02d%02d%02d\n' % (startnow.year, startnow.month, startnow.day, startnow.hour, startnow.minute, startnow.second)) for (val,key) in sortlist: currlist.write('%s %f\n' % (key,val)) currlist.close()
Chunk referenced in 5.2
<ranking: print closing summary 5.5> =
closenow=datetime.datetime.now() sorttime = closenow-ranknow print "Data sorting took %d.%06d seconds<BR/>" % (sorttime.seconds,sorttime.microseconds)
Chunk referenced in 5.2

6. rank.py

This module provides three procedures for analysing the rankings of John's railway photographs. Rnaking data is stored in two files, generically known as the trainrank and trainview files. The first stores ranking data for a set of images, as computed at a specified data and time. The second stores access requests for images in the database, together with the time and IP address of the request. Note that there is one entry for each unique image in the first file, whereas there may be multiple entries in the second file for any given image.

"rank.py" 6.1 =
import re,string,sys,datetime import cgi import getopt import math import os import time import urllib startnow=datetime.datetime.now() datepat=re.compile(r'(\d{4})(\d{2})(\d{2}):(\d{2})(\d{2})(\d{2})') pat=re.compile("(\d{4})(\d{2})(\d{2}):(\d{2})(\d{2}) ([0-9a-f\.:]+ )?(trains/)?(.*)$") DECAY=15.0 <rank: define the strtotime function 6.2> <rank: define rankdata procedure 6.3> <rank: define ranklog procedure 6.4>

6.1 rank: define the strtotime function

<rank: define the strtotime function 6.2> =
def strtotime(str,default): res=datepat.match(str) if res: thisdatetime=datetime.datetime(int(res.group(1)), # year int(res.group(2)), # month int(res.group(3)), # day int(res.group(4)), # hour int(res.group(5)), # minute int(res.group(6))) # second return thisdatetime else: return default
Chunk referenced in 6.1

6.2 rank: define rankdata procedure

The rankdata procedure reads the train rank file (the path to which is passed as the parameter), containing a date and time when the file was created, together a line for every image in the database. Each line contains the image path, starting at the trains subdirectory, together with the (decayed) vote value. Each vote is decayed by an exponential factor votefactor, where the exponent is proportional to the length of time since the creation date of the file. An updated vote value is entered into an associative table, which is returned, along with various housekeeping values of totalimages (the total number of distinct images processed), and datatime, the elapsed wall time spent in processing this file.

<rank: define rankdata procedure 6.3> =
def rankdata(CURRENT): datastart=datetime.datetime.now() totalimages=0 table={} currlist=file(CURRENT,"r") currdate=currlist.readline() currdatetime=strtotime(currdate,startnow) timesincelast=startnow-currdatetime dayssincelast=timesincelast.days+timesincelast.seconds/86400.0 expval=-dayssincelast/DECAY votefactor=math.exp(expval) for l in currlist.readlines(): res=re.match(r'([^ ]+) +([0-9.]+)$',l) if res: lastvote=float(res.group(2)) nowvote=votefactor*lastvote table[res.group(1)]=nowvote else: print 'bad format in %s' % (l) totalimages+=1 currlist.close() datanow=datetime.datetime.now() datatime = datanow-datastart return totalimages, datatime, votefactor, table
Chunk referenced in 6.1

6.3 rank: define ranklog procedure

<rank: define ranklog procedure 6.4> =
def ranklog(LOGFILE,table,ignorepat, starttime="20050101:000000",finishtime="20201231:235959"): logstart=datetime.datetime.now() data=open(LOGFILE) logcount=0 starttime=strtotime(starttime,None) finishtime=strtotime(finishtime,None) for l in data.readlines(): logcount+=1 l=l.strip() res=ignorepat.match(l) if res: continue res=pat.match(l) if res: year=int(res.group(1)) month=int(res.group(2)) day=int(res.group(3)) hour=int(res.group(4)) minute=int(res.group(5)) accesstime = datetime.datetime(year,month,day,hour,minute) #print "%s %s %s" % (accesstime,starttime,finishtime) if accesstime < starttime or accesstime > finishtime: #print "ignoring %s" % (l) continue timesinceaccess=startnow-accesstime dayssinceaccess=timesinceaccess.days+timesinceaccess.seconds/86400.0 expval=-dayssinceaccess/DECAY voteval=math.exp(expval) #print "%1.4f %2.6f %2.5f" % (voteval,expval,dayssinceaccess) ipadr=res.group(6) if ipadr: ipadr=ipadr.strip() imagename=res.group(8) if table.has_key(imagename): table[imagename]+=voteval else: table[imagename]=voteval pass ranknow=datetime.datetime.now() ranktime = ranknow-logstart list=[] for key in sorted(table.keys()): list.append((table[key],key)) sortlist=sorted(list,reverse=True) totalimages = len(sortlist) closenow=datetime.datetime.now() sorttime = closenow-ranknow return totalimages, logcount, ranktime, sorttime, sortlist
Chunk referenced in 6.1

7. TO DO

8. Indices

8.1 Identifier Index

Identifier Defined in Used in
BASEPAGE 1.2 1.3, 2.3, 2.20, 2.21, 2.23, 3.7
BASEPAGE 1.3 1.3, 2.3, 2.20, 2.21, 2.23, 3.7
BASEPAGE 1.4 1.3, 2.3, 2.20, 2.21, 2.23, 3.7
RANKINGS 2.8
VIEWINGS 2.8
datatime 6.3
dir 2.26 2.26, 2.26
display 2.21 2.1, 2.26
imageisrelative 2.6 2.1
imageisrelative 2.6 2.1
logentrypat 2.17 2.19
logentrypat 3.5 2.19
rankdata 6.3
ranklog 6.4 3.5
strtotime 6.2 5.1
table 6.3
top 2.3 2.1, 2.21, 2.21
totalimages 6.3
visit 2.26 2.1, 2.26
votefactor 6.3

8.2 Chunk Index

Chunk Name Defined in Used in
Explain missing images 2.24 2.23
Print ranking information 2.25 2.21
collect cgi parameters 2.6 2.1
collect previous rankings 2.8 2.1
define constants for viewtrains 2.3, 2.7 2.1
define constants for viewtrains 2.3, 2.7 2.1
define function convertIPtoHex 2.15 2.5
define getrank routine 2.18 2.17
define procedure log 2.16 2.5
define procedure to display the image 2.21 2.5
define procedure to search directories 2.26 2.5
define regular expression patterns 2.4 2.1
define subroutines 2.5 2.1
define the XML dispatch routines 2.20 2.5
define the ranking procedure 2.17 2.5
determine server environment 1.5 1.1
display can access file 2.22 2.21
display cannot access file 2.23 2.21
getrank: extract data from a single logfile entry 2.19 2.18
globals for linux 1.4 1.5
globals for macosx 1.2 1.5
globals for solaris 1.3 1.5
imports 2.2 2.1, 4.1
print header of html page 2.9, 2.10, 2.11, 2.12, 2.13 2.1, 3.1
print trailer of html page 2.14 2.1, 3.1
rank: define rankdata procedure 6.3 6.1
rank: define ranklog procedure 6.4 6.1
rank: define the strtotime function 6.2 6.1
ranking: build new ranking list 5.4 5.2
ranking: parse and process a ranking entry 5.3 5.2
ranking: print closing summary 5.5 5.2
rankings: print forward and backward buttons 3.6 3.1, 3.1
ranktrains: collect cgi parameters 3.3 3.1
ranktrains: collect previous ranking information 3.4 3.1
ranktrains: define constants 3.2 3.1
ranktrains: generate image rankings 3.7 3.1
ranktrains: print ranking analysis 3.9 3.1
ranktrains: print rankings table 3.8 3.1
ranktrains: update rankings with latest log info 3.5 3.1

8.3 File Index

File Name Defined in
rank.py 6.1
ranking.py 5.1, 5.2
ranktrains.py 3.1
tidytrains.py 4.1
viewtrains.py 2.1

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