ACF acf www example: Difference between revisions
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= Set the hostname with a web interface = | = Set the hostname with a web interface = | ||
Revision as of 14:29, 15 February 2015
![]() Please feel free to help us make an up-to-date version. (Discuss) |
Set the hostname with a web interface
In this example we will use the hostname-model.lua and hostname-controller.lua from the previous example to set the hostname using the acf web interface.
For this example, we will assume you have root access on the linux box you are running on (preferably an alpine box!)
Use the existing code
We should have 'mvc.lua in the current directory, with the controller and model in helloworld/app The Controller and Model look the same as the end of the mvc.lua example, except we've taken out the on_load, pre_exec, post_exec, and on_unload methods.
helloworld/app/hostname-controller.lua
-- hostname controller code module ( ... , package.seeall ) create = function (self ) return self.model.update(self.clientdata.hostname) end read = function (self) return self.model.read() end update = create delete = function (self ) self.clientdata.hostname="" return self.worker:create() end
helloworld/app/hostname-model.lua
-- Model functions for retrieving / setting the hostname module ( ..., package.seeall ) -- All functions return a table with -- A value, the type of the value, and a message if there was an error local hosttype={ type="string" } update= function ( name ) -- Check to make sure the name is valid if (name == nil) then hosttype.msg = "Hostname cannot be nil" elseif (#name > 16) then hosttype.msg = "Hostname must be less than 16 chars" elseif (string.find(name, "[^%w%_%-]")) then hosttype.msg = "Hostname can contain alphanumerics only" end -- If it is, set the hostname if (hosttype.msg == nil ) then local f = io.open("/etc/hostname", "w") if f then f:write(name .. "\n") f:close() end f = io.popen ("/bin/hostname -F /etc/hostname") f:close() return read() -- Otherwise, return the error message else hosttype.value = name return hosttype end end read= function () local f = io.popen ("/bin/hostname") local n = f:read("*a") or "none" f:close() n=string.gsub(n, "\n$", "") hosttype.value = n return (hosttype) end
Get and configure ACF
1. Grab a copy of all the acf code and support libraries from svn and copy into an "/usr/share/acf" directory
svn export svn://svn.alpinelinux.org/acf/core/trunk /usr/share/acf
2. Copy the acf.conf file to /etc/acf
cp /usr/share/acf/acf.conf /etc/acf/acf.conf
3. Start the web server
You'll need haserl, lua, and mini_httpd installed to run acf. If not already done, please install them.
Start mini_httpd (by hand for now)
mini_httpd -d /usr/share/acf/www -c 'cgi-bin/**' start
4. Move your hostname model and controller
mkdir /usr/share/acf/app/sample mv helloworld/app/hostname-* /usr/share/acf/app/sample/
5. Create a new view template, which is a "lua server page" Create the file as /usr/share/acf/app/sample/hostname-html.lsp
<? local form = ... ?> <h1>Hostname</h1> <form action="update" method=post> <p>The Hostname is now <input name=hostname value="<?= form.value ?>"</p> <p>input type=submit value=Submit></p> </form>
6. Create a new roles file, which gives all users permission to access your actions. Create the file as /usr/share/acf/app/sample/hostname.roles
GUEST=hostname/read,hostname/update
Try the app
point your browser to your host/cgi-bin/acf/sample/hostname/read
You should now be able to update the hostname using the web interface, and your existing model and controller.