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Web based script - ping a series of remote hosts
Expect Processes example from a Well House Consultants training course
More on Expect Processes [link]
Source code: livetest.exp Module: T212
#!/usr/bin/env expect
# This was originally written as a sample script to show # how expect can be used on a web server to monitor other # systems. We've extended it as a live script on our # own web sites - this is the version that is live at the # time of writing set hosts {www.wellho.net www.wellho.co.uk www.sheepbingo.co.uk office.wellho.net www.melkshamhotel.co.uk www.savethetrain.org.uk www.wellhousemanor.co.uk www.wellho.info www.training-notes.co.uk} set clients {www.avairpros.com www.express-cleaning-supplies.co.uk www.gregpullen.co.uk} set localhosts {hugo fire coffee dolphin pepsi saturn mars} set trainees {tormentil tansy thyme parsley nutmeg flipper chopsuey bhajee vindaloo snowdrop buttercup elderberry daisy dandelion pasanda foxglove } # If running on our Intranet, test local and client systems instead if {[regexp {192\.168\.200|127\.0\.0} $env(SERVER_ADDR)]} { set hosts [concat $clients $localhosts $trainees] } log_user 0 set timeout 25 set runningcount 0 # Parallel ping all the systems we're testing foreach system $hosts { spawn ping -c 2 $system lappend idlist $spawn_id set realhost($spawn_id) $system incr runningcount } # gather up a series of responses while {$runningcount > 0} { expect { -i $idlist "\n" { set which $expect_out(spawn_id) lappend ans($which) $expect_out(buffer) } eof { # search and remove completed host from idlist set donepos [lsearch $idlist $expect_out(spawn_id)] set idlist [lreplace $idlist $donepos $donepos] incr runningcount -1 } timeout { break } } } puts "content-type: text/html\n" set goodstuff "" set badstuff "" set good 0 set bad 0 foreach which [array names ans] { set posthost 0 set host "NULL" set count 0 foreach line $ans($which) { if {$posthost == 1} { set count "undef" regexp "\(\[0-9\]\) packets received" $line all count # puts "$host - returned $count packets" set posthost 2 } if {[regexp ^---\ \(\[^\ \]+\) $line all host]} { set posthost 1 } } if {$count == 2} { append goodstuff "<a href=http://$realhost($which)>" append goodstuff "$realhost($which)</a> is available<br>" incr good } else { append badstuff "$realhost($which) is NOT available<br>" incr bad } } set stuff {<span class=subhead><b>System report - Well House Consultants</b></span></br><br> <span class=body>Report generated } append stuff [clock format [clock seconds]] append stuff {<br><br>} append stuff "<!-- start -->" append stuff "<i>Operational ...</i><br>$goodstuff<br><br>" append stuff "Total of $good systems<hr>" append stuff "<i><b>Not operational ...</b></i><br>" append stuff "$badstuff<br><br>Total of $bad systems" append stuff "<br><!-- end -->" append stuff { <br><br>This page is generated by a script written in Expect (an extension of the Tcl language) and was written by Well House Consultants who provide <a href=/course/tcl-tk.html> training on Tcl, Expect and Tk</a>. To learn a little more about this script, please visit the associated <a href=/resources/pinginfo.html>information page</a><br> } set fh [open template/page.htp r] set content [read $fh] regsub %ginc% $content "" content regsub %cookie% $content "" content regsub %seepic% $content "" content regsub %finish% $content "" content regsub -all %lhs% $content "ctco" content regsub %topimg% $content "WHhead2.gif" content regsub %stuff% $content $stuff content regsub -all %title% $content "Well House System Status" content regsub -all {<\?php[^\n]*locate[^\n]*?\?>} $content \ "international site" content regsub -all {<\?php[^\n]*voiceline[^\n]*?\?>} $content \ "+44 (0) 1225 708225" content regsub -all {<\?php[^\n]*today[^\n]*?\?>} $content \ [clock format [clock seconds]] content regsub -all {<\?php[^\n]*faxline[^\n]*?\?>} $content \ "+44 (0) 1225 707126" content regsub -all {<\?php[^\n]*copyyear[^\n]*?\?>} $content \ "2005" content regsub -all {<\?php.*?\?>} $content "" content puts $content Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Tcl * Tcl Programming * Tcl Programming Also available on on site courses for larger groups Books covering this topic
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covering Tcl, Tk and Expect are listed here and when you've selected a
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Other Examples
This example comes from our "Expect Processes" training module. You'll find a description of the topic and some
other closely related examples on the "Expect Processes" module index page.
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