I have a PHP daemon script running on the command line that can be connected to via telnet etc and be fed commands.
What it does with the command is based on what modules are loaded, which is currently done at the start. (psuedocode below for brevity)
$modules = LoadModules();
StartConnection();
while(true){
ListenForCommands();
}
function LoadModules(){
$modules = Array();
$dir = scandir("modules");
foreach($dir as $folder){
include("modules/".$folder."/".$folder.".php");
$modules[$folder] = new $folder;
}
}
function ListenForCommands(){
if(($command = GetData())!==false){
if(isset($modules[$command])){
$modules[$command]->run();
}
}
}
So, an example module called "bustimes" would be a class called bustimes, living in /modules/bustimes/bustimes.php
This works fine. However, I'd like to make it so modules can be updated on the fly, so as part of ListenForCommands it looks at the filemtime of the module, works out if it's changed, and if so, effectively reloads the class.
This is where the problem comes in, obviously if I include the class file again, it'll error as the class already exists.
All of the ideas I have of how to get around this problem so far are pretty sick and I'd like to avoid doing.
I have a few potential solutions so far, but I'm happy with none of them.
when a module updates, make it in a new namespace and point the reference there
I don't like this option, nor am I sure it can be done (as if I'm right, namespaces have to be defined at the top of the file? That's definitely workaroundable with a file_get_contents(), but I'd prefer to avoid it)
Parsing the PHP file then using runkit-method-redefine to redefine all of the methods.
Anything that involves that kind of parsing is a bad plan.
Instead of including the file, make a copy of the file with everything the same but str_replacing the class name to something with a rand() on the end or similar to make it unique.
Does anyone have any better ideas about how to either a) get around this problem or b) restructure the module system so this problem doesn't occur?
Any advice/ideas/constructive criticism would be extremely welcome!
You should probably load the files on demand in a forked process.
You receive a request
=> fork the main process, include the module and run it.
This will also allow you to run several commands at once, instead of having to wait for each one to run before launching the next.
Fork in php :
http://php.net/manual/en/function.pcntl-fork.php
Tricks with namespaces will fail if module uses external classes (with relative paths in namespace).
Trick with parsing is very dangerous - what if module should keep state? What if not only methods changed, but, for example, name of implemented interface? How it will affect other objects if they have link to instance of reloaded class?
I think #Kethryweryn is something you can try.
Related
I am in the process of migrating a site from my personal dev server onto Windstream's business hosting server. I've already run into the issue of having developed using PHP 5.4 only to find out that my static functions won't work on WS's 5.1.4 installation. I've since fixed those issues and am not facing one that I can't seem to find any help for on the internet.
All of the static functions I was using have been rewritten as functions outside the class scope. Instead of having
class Product{
...
public static function myFunction(){}
...
}
I now have
function myFunction(){}
class Product{...}
in my included Product.php file.
However, when I try to call myFunction() from my code, nothing happens. I know the nothingness comes from WS's error handling, but the point is, the function isn't working. To verify this, I have taken the following steps:
Inserted the line echo "entered included"; immediately following the <?php in Product.php. This prints "entered included" on the index page, indicating that my include is working. I have done the same thing before the final ?> with the same results, so I don't think it's getting hung up inside the included file.
I have changed myFunction() in the included file to be simply
function myFunction(){echo "myFunction works";}
A call to myFunction() still makes nothing happen.
I have moved myFunction() to the including file (myFunction() now lives in index.php instead of Product.php; index includes Product.php). This time, myFunction() executes without issue.
To my 'hack it til it does what it should' sensibilities, this tells me that the server is having a problem with functions that are declared in files that are included; honestly, though, I have absolutely no clue what's going on, and any help would be appreciated. Their website is currently down, and they were expecting it to only be offline for a day, so I'll try pretty much anything short of sacrificing a fatted calf.
I know I should be posting more specific code, but since this is a customer's actual website, I'm trying to put as little of the actual code out here as is possible. I'm happy to append specific sections of code to this entry as they are requested for clarification.
Thanks in advance for your consideration.
#Rottingham: First, thanks for the 3v4l link. Second, my assumption about static methods in 5.4 vs 5.1.4 came from this line of php.net's page on static members and methods:
"As of PHP 5.3.0, it's possible to reference the class using a variable. The variable's value can not be a keyword (e.g. self, parent and static)."
src - http://www.php.net/manual/en/language.oop5.static.php
Since my version and the server version were on different sides of the 5.3 mark mentioned, I incorrectly assumed that this was my problem.
Third, when I get in from my day job, I'll update my code to show errors and update this post if a solution has not yet been found.
Ultimately, my problem isn't with using static methods (since I don't have them anymore) but with using any function that is declared in an included .php file.
I want to be able to call the CakeS3 plugin from the Cake Shell. However, as I understand it components cannot be loaded from the shell. I have read this post outlining strategies for overcoming it: using components in Cakephp 2+ Shell - however, I have had no success. The CakeS3 code here is similar to perfectly functioning cake S3 code in the rest of my app.
<?php
App::uses('Folder','Utility');
App::uses('File','Utility');
App::uses('CakeS3.CakeS3','Controller/Component');
class S3Shell extends AppShell {
public $uses = array('Upload', 'User', 'Comment');
public function main() {
$this->CakeS3 = new CakeS3.CakeS3(
array(
's3Key' => 'key',
's3Secret' => 'key',
'bucket' => 'bucket')
);
$this->out('Hello world.');
$this->CakeS3->permission('private');
$response = $this->CakeS3->putObject(WWW_ROOT . '/file.type' , 'file.type', $this->CakeS3->permission('private'));
if ($response == false){
echo "it failed";
} else {
echo "it worked";
}
}
This returns an error of "Fatal error: Class 'CakeS3' not found in /home/app/Console/Command/S3Shell.php. The main reason I am trying to get this to work is so I can automate some uploads with a cron. Of course, if there is a better way, I am all ears.
Forgive me this "advertising"... ;) but my plugin is probably better written and has a better architecture than this CakeS3 plugin if it is using a component which should be a model or behaviour task. Also it was made for exactly the use case you have. Plus it supports a few more storage systems than only S3.
You could do that for example in your shell:
StorageManager::adapter('S3')->write($key, StorageManager::adapter('Local')->read($key));
A file should be handled as an entity on its own that is associated to whatever it needs to be associated to. Every uploaded file (if you use or extend the models that come with the plugin, if not you have to take care of that) is stored as a single database entry that contains the name of the config that was used and some meta data for that file. If you do the line of code above in your shell you will have to keep record in the table if you want to access it this way later. Just check the examples in the readme.md out. You don't have to use the database table as a reference to your files but I really recommend the system the plugin implements.
Also, you might not be aware that WWW_ROOT is public accessible, so in the case you store sensitive data there it can be accessed publicly.
And finally in a shell you should not use echo but $this->out() for proper shell output.
I think the App:uses should look like:
App::uses('CakeS3', 'CakeS3.Controller/Component');
I'm the author of CakeS3, and no I'm afraid there is no "supported" way to do this as when we built this plugin, we didn't need to run uploads from shell and just needed a simple interface to S3 from our controllers. We then open sourced the plugin as a simple S3 connector.
If you'd like to have a go at modifying it to support shell access, I'd welcome a PR.
I don't have a particular road map for the plugin, so I've tagged your issue on github as an enhancement and will certainly consider it in future development, but I can't guarantee that it would fit your time requirements so that's why I mention you doing a PR.
Here's the situation:
I have a catch-all on my domain email (so *#domain.com) redirecting to a piping script located at /home/domain/scripts/piper.php. This piper script is not within the Kohana ORM, but all of my other files are. I want to try to use Kohana inside this piper.php file.
I have tried (unsuccessfully) all of the following:
Including Kohana
I couldn't figure out what needed to be included, and more importantly how to override the url variable that Kohana uses to determine the right controller. Also, this is a catch-all piper, so it isn't using HTTP (to my knowledge), so much as executing a command.
Piping
I tried piping to the following:
/home/domain/public_html/index.php --uri="piper"
But cPanel makes this impossible, as you can only specify the destination script, and not the proper flags and such (unless I am missing something).
PHP exec()
I tried using the following line:
exec("php /home/domain/public_html/index.php --uri=\"/piper\"")
I was hoping that the stdin data would be maintained across the exec() command, but I could never get it to recognize the uri command, though I can run this on my localhost and it works just fine.
I was using http://www.coderelic.com/2011/10/creating-cron-jobs-in-kohana-3-x-is-a-piece-of-cake/ as a reference, but can't get anything to work.
I'm happy with either one of these solutions such that I can see an incoming email, parse it, then send emails based on the parameters.
Let me know if you need more information! I'm le stumped.
/home/domain/public_html/index.php --uri="piper" would be a valid way to do it. If your host sucks and doesn't let you specify that, put it into a bash script instead and reference that.
If you are on any recent version of kohana (3.2 or 3.3), a better way to do this would be to use Minion to run the command line task. This is what Minion was designed for.
All you need to do is to:
modify your piper.php script to be a valid PHP class;
place it in /application/classes/ folder;
Kohana will automatically load your class file (like include) during initialization.
Then you can use your piper class as usual class by $piper = new Piper; ....
UPD
You have to serve your emails trough Kohana.
Create controller, for example pipe (route it with /pipe URL):
public function action_pipe() {
$pipe = new Pipe; // This creates new Pipe object (your emails serving class)
$pipe->serve(); // Sserve emails within `serve()` method of Pipe class
}
Although admittedly, I'm not sure if these other answers are correct because I can't figure out how to reproduce the results.
What ended up working for my situation was to create a Controller_Piper class that is called in the /home/domain/scripts/piper.php. What I did was to copy the code from /home/domain/public_html/index.php and changed the following:
echo Request::factory("/piper")
->execute()
->send_headers(TRUE)
->body();
This loads the piper controller and executes everything very nicely. Not sure if it's the cleanest, but it does work.
In order to localize strings used within my javascript, I want scan all my js files for such strings.
I am using a t() function to request string translations as follows:
t("Hello world");
or with dynamic portions:
t("Hello #user", {"#user": "d_inevitable"});
I want to detect all calls to the t() function and thus gather the strings contained in the first argument in a php "build" script, but skipping the following:
function foo(t) {
t("This is not the real t, do not localize this!");
}
function bar() {
var t = function(){}; //not the real t either...
}
function zoo() {
function t() {
//This also isn't the real t() function.
}
}
t("Translate this string, because this is the real t() in its global scope");
So the simple rule here is that the t function being invokes must be in global scope in order for the first argument to qualify as a translation string.
As a rule, dynamic runtime data as first argument is not allowed. The first argument to t() must always be a "constant" literal string.
I think php codesniffer will help me do it, however all the documentation I could find on it is about enforcing code standard (or detecting violations of it). I need lower level access to its js lexer.
My question is:
Would the php codesniffer's js lexer be able to help me solve my problem?
If so how do I access that lexer?
Are there any other php libs that could help me find the calls to t()?
Please do not suggest stand-alone regular expressions as they cannot possibly solve my problem in full.
Thank you in advance.
What you are describing is basically a coding standard. Certainly, ensuring strings are localised correctly is part of many project standards. So I think PHPCS is the right tool for you, but you will need to write a custom sniff for it because nothing exists to do exactly what you are after.
The best thing to do is probably clone the PHPCS Git repo from Github and then create a new directory under CodeSniffer/Standards to contain your custom sniff. Let's say you call it MyStandard. Make sure you create a Sniffs directory under it and then a subdirectory to house your new sniff. Take a look at the other standards in there to see how they work. You'll also find it easier to copy an existing ruleset.xml file from another standard and just change the cotent to suit you. if you don't want to include any other sniffs from anywhere (you just want to run this one check over your code) then you can just specify a name and description and leave the rest blank.
There is a basic tutorial that covers that.
Inside your sniff, you'll obviously want it to check JS files only, so make sure you specify that in the supportedTokenizers member var (also in the docs). This will ensure PHP and CSS files are always ignored.
When you get down to the actual checking, you'll have full low-level access to the parsed and tokenised content of your file. There are a lot of helper functions to check things like if the code inside other scopes, or to help you move backwards and forwards through the stack looking for bits of code you need.
TIP: run PHPCS using the -v option to see the token output on your file. It should help you see the structure more easily.
If you want to really do things properly, you can even create a nice unit test for your sniff to make sure it keeps running over time.
After all this, you'd check your code like this:
phpcs --standard=MyStandard /path/to/code
And you can use a lot of integrations that exist for PHPCS inside code editors.
You might decide to add a new more sniffs to the standard to check other things, which you can then do easily using your ruleset.xml file or by writing more custom sniff classes.
I hope that helps a bit. If you do decide to write your own sniff and need help, just let me know.
I need to be able to "effectivly" redeclare my class, so that during runtime, whilst my PHP IRC bot is running I can reload modules as the code base changes, which requires getting the class, but PHP won't allow it to be redeclared, nor is there a way to undeclare a class.
Is there a way I can acheive this? Perhaps some other method? I've tried "runkit", but that failed.
My current code is here:
http://pastie.org/private/ptj7c0t0teh3nnzn7ehcg
So to clarify, I effecivly need to be able to reload my class, instatiate it and put into a property in my main bot class once code has changed in said module, whilst the bot is running (run-time).
A brief look at your application leads me to believe your best course of action is to use a base class as suggested in the comment above.
Something to the extent of:
class IRCModule {
private static $module_dir = ''; //put your module directory here w/o trailing slash
public static function getModule( $module ) {
//if the module directory doesn't exist, don't do anything
if( !is_dir( self::$module_dir.DIRECTORY_SEPARATOR.$module ) ) return false;
//load the module file
$fname = scandir(self::$module_dir.DIRECTORY_SEPARATOR.$module);
$fname = $fname[2]; //first 2 elements will be . and ..
require_once( self::$module_dir.DIRECTORY_SEPARATOR.$module.DIRECTORY_SEPARATOR.$fname );
$className = str_replace('.class.php',NULL,$fname);
return new $className();
}
}
You would then extend that using your modules. That would allow you to overwrite a module by simply removing it's old file /my/module/dir/moduleName/moduleNameV1.0.class.php and replacing it with a new version /my/module/dir/moduleName/moduleNameV1.1.class.php
As mentioned in the comments, this will eventually fill the memory on the server, so you should schedule a reboot of the service each time you make substantial changes, but it also allows you to load new versions on demand without stopping the service.
A more stable approach would be to take advantage of process control and spin off daemons for each connection from your parent script, or implement a cache system that stores all data on the disk/database so that you can detect a change in module version and instantly reboot the server. But the solution above should work for you for the time being :)