| |||||||||||
| |||||||||||
Command line and data file use / full course example
Input / Output example from a Well House Consultants training course
More on Input / Output [link]
Source code: log_counter Module: U110
-- Web server log file, "combined" format with vhost in 2nd position --[[ 192.161.191.101 www.wellho.net - [05/Nov/2015:03:35:03 +0000] "GET /resources/Y202.html HTTP/1.1" 200 26241 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36" ]] --[[ Build up example at end of course ... 1. Wrote short main test program 2. Wrote "classes" / tables of functions that it used 3. Got that working 4. Enhanced main program to do other things, adding extra class code to be done ... (in other word 'this is how far the example has gone') 5. Refactor to save time and space using metatables, etc 6. Separate out utilisites and "classes" into separate files for late reuse 7. Write it up and test it more 8. Take a long, cold drink (or a warm beer) ]] Access = {} function Access.gethost(access) return access[2] end function Access.getstatus(access) return access[9] end function Access.factory(raw) local hit = {} local fn = 1 local v for v in string.gmatch(raw,"%S+") do hit[fn] = v fn = fn + 1 end hit["getServer"] = Access.gethost -- Should really use metatable technique! hit["getStatus"] = Access.getstatus return hit end -- Main Application ----------------------------------- if not arg[1] then -- Parameter needed print("Usage: " .. arg[0] .. " {logFileName}") return end fh, err = io.open(arg[1],"r") -- Input file not available if not fh then print ("Nah - " .. err) return end total = 0 counter = {} while true do lyne = fh:read() if not lyne then break end current = Access.factory(lyne) -- Make me an object total = total + 1 serverName = current:getServer() if counter[serverName] then counter[serverName] = counter[serverName] + 1 else counter[serverName] = 1 end end print("Total lines of data: " .. total) -- table.sort(counter) Will NOT work ... sort works on an indexed table. -- Following code sorts by host name hosts = {} for k,v in pairs(counter) do hosts[#hosts+1] = k end table.sort(hosts) for k,v in ipairs(hosts) do print (string.format("%-30s %6d",v,counter[v])) end print (" ----------------------------") -- resort by number of accesses function bycount(this, that) return counter[this] > counter[that] end table.sort(hosts,bycount) for k,v in ipairs(hosts) do print (string.format("%-30s %6d",v,counter[v])) end --[[ Sample run WomanWithCat:ln15 grahamellis$ lua log_counter ac_20151106 Total lines of data: 171578 chs73.info 97 grahamellis.co.uk 61 lisa-ellis.co.uk 4 melksh.am 176 railcustomer.info 26 readtheirobituary.com 22 sheepbingo.co.uk 21 thebutlerdidit.info 8 transwilts.org.uk 74 twhc.org.uk 2876 www.across-the-pond.co.uk 211 www.consultations.org.uk 3 www.firstgreatwestern.info 55277 www.melkshamchamber.org.uk 1194 www.passenger.chat 3 www.savethetrain.org.uk 544 www.twcrp.org.uk 1707 www.wellho.net 108706 www.wellhousemanor.co.uk 568 ---------------------------- www.wellho.net 108706 www.firstgreatwestern.info 55277 twhc.org.uk 2876 www.twcrp.org.uk 1707 www.melkshamchamber.org.uk 1194 www.wellhousemanor.co.uk 568 www.savethetrain.org.uk 544 www.across-the-pond.co.uk 211 melksh.am 176 chs73.info 97 transwilts.org.uk 74 grahamellis.co.uk 61 railcustomer.info 26 readtheirobituary.com 22 sheepbingo.co.uk 21 thebutlerdidit.info 8 lisa-ellis.co.uk 4 www.consultations.org.uk 3 www.passenger.chat 3 WomanWithCat:ln15 grahamellis$ ]] Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Lua * Lua Programming * Lua Programming Also available on on site courses for larger groups Books covering this topic
Yes. We have over 700 books in our library. Books
covering Lua are listed here and when you've selected a
relevant book we'll link you on to Amazon to order.
Other Examples
This example comes from our "Input / Output" training module. You'll find a description of the topic and some
other closely related examples on the "Input / Output" module index page.
Full description of the source code
You can learn more about this example on the training courses listed on this page,
on which you'll be given a full set of training notes.
Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License. Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre. • The Horse's mouth provides a daily tip or thought. • Further resources are available via the resources centre. • All of these resources can be searched through through our search engine • And there's a global index here. Web site author
Purpose of this website
This is a sample program, class demonstration or answer from a
training course. It's main purpose
is to provide an after-course service to customers who have attended our
public private or
on site courses, but the examples are made
generally available under conditions described below.
Conditions of use
Past attendees on our training courses are welcome to use individual
examples in the course of their programming, but must check
the examples they use to ensure that they are suitable for their
job. Remember that some of our examples show you how not to do
things - check in your notes. Well House Consultants take no responsibility
for the suitability of these example programs to customer's needs.
This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details. Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request. |
| ||||||||||
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho PAGE: http://www.wellho.info/resources/ex.php • PAGE BUILT: Sun Oct 11 14:50:09 2020 • BUILD SYSTEM: JelliaJamb |