php sync scripts + sync adaptor plugin -- could something like this work?

[Mark Brown]

Hi all,

I'm only semi php- and js-literate, but i'm wondering if this could work in  theory?

I'd like to have the benefits of lazy-loading etc of a syncadaptor on my cheap shared hosting. If i'm reading the developer docs correctly, there's only a few  mandatory methods for a sync adaptor.

Here's my rough idea:

On a web-server:

empty+plugins.html  <--- the core wiki with plugins baked in
content1.tid   <--- a .tid file to be synced
content2.tid  <--- a .tid file to be synced
content3.tid   <--- a .tid file to be synced
getSkinnyTiddlers.php  <-- a php script that compiles a set of skinny tiddlers from all .tid files and echoes as json
saveTiddler.php <- a php script that takes a file upload and saves as a .tid
loadTiddler.php <- that takes a GET parameter as a .tid file name and echoes the full tiddler as json
deleteTiddler.php <- that takes a GET parameter as a .tid file name and deletes that file

In a corresponding sync adaptor plugin:

- the constructor method
- methods corresponding to each of the 4 php scripts, doing an http request to that script


That's it. No database back end, python, or nodejs.

Possible? Practical? Someone done it already?

[Jeremy Ruston]

Hi Mark

I'm only semi php- and js-literate, but i'm wondering if this could work in  theory?

Broadly, yes, it looks like a reasonable and potentially robust approach. There are a lot of details you’d have to work out - for example, how the .tid files are named, given that not all of the characters that can appear in a tiddler title can be used within a filename.

I think you wouldn’t necessarily have to create a custom sync adaptor. Instead, you could offer a compatible HTTP interface and have the standard tiddlywebadaptor handle syncing.

Best wishes

Jeremy.

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[Mark Brown]

Thanks Jeremy. I'm making good progress. I hope to share it soon.

[Mark Brown]

A progress report:

Made a lot of progress today. I have working bare bones implementations of:

• saveTiddler
• deleteTiddler
• getSkinnyTiddlers

loadTiddler is giving me trouble, however. The wiki just doesn't seem to dispatch the load events, and I don't know why.

for anyone who is curious, my horrible code is here at github, but be warned it is not pretty:

https://github.com/Wheels00/tw5-php-simple-sync

[Mark Brown]

Ok, so, i've been debugging my lazy loading issue.

I set a breakpoint at the start of this syncer.js method in Jeremy's code:

     
     
       

/*

     
     
       

Lazily load a skinny tiddler if we can

     
     
       

*/

       

Syncer.prototype.handleLazyLoadEvent = function(title) {

     
       

// Don't lazy load the same tiddler twice

     
       

var info = this.tiddlerInfo[title];

      // MARK's BREAKPOINT
     
       

if(!info || !info.hasBeenLazyLoaded) { // MARK'S OBSERVATION -- ALWAYS EVALUATES FALSE AND SKIPS OVER

     
     
       

this.createTiddlerInfo(title);

     
     
       

this.tiddlerInfo[title].hasBeenLazyLoaded = true;

     
     
       

// Queue up a sync task to load this tiddler

     
     
       

this.enqueueSyncTask({

     
     
       

type: "load",

     
     
       

title: title

     
     
       

});

     
       

}

};

The wiki seems to always think my skinny tiddler has already been lazy loaded... but I can't workout where or why this flag is being set.

Any ideas?

[Danielo Rodríguez]

Yes,

It is a bug introduced in 5.1.13
I have reported it some time ago and it's already fixed, but you have to use prerelease version of TW or wait until 5.1.14
I advised Jeremy to do a patch release of 5.1.13 because it adds a lot of confusion to developers, but I didn't hear anything from him about this.

Regards

[Danielo Rodríguez]

If you are curious about it, here is the original issue

https://github.com/Jermolene/TiddlyWiki5/issues/2514

Maybe you want to add a +1 to it

[Mark Brown]

Thanks so much for your explanation, Danielo! You've saved me hours of debugging.

I'll use the pre-release

[Mark Brown]

And it works! (well enough for my purposes at least)

I call it PHP Simple Sync and if anyone would like to improve it you can find it here https://github.com/Wheels00/tw5-php-simple-sync