Re: [twdev] Re: How to use Node modules in browser?

[okido]

Hi Bimlas,

I use TWc in a straight forward nw.js install.
You can include every npm packet as simple as using something like: 
let UglifyJS = require("uglify-es")
in your scripts or inline scripts.
Saving requires a plugin that can be found here: 
https://github.com/nwOkido/nwTWcSaver.
Access to the filesystem runs with:
 let fs = require("fs")


Have a nice day, Okido

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

 

> Yes, it should be documented there.
>

Opened https://github.com/Jermolene/TiddlyWiki5/pull/4213 

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

Opened https://github.com/Jermolene/TiddlyWiki5/pull/4211 
and https://github.com/Jermolene/TiddlyWiki5/pull/4212

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

Jeremy

I found why my files didn't load: the code above 
(https://groups.google.com/d/msg/tiddlywikidev/wKqzwaMfBJw/YwJVbBjGBAAJ) 
works, but only if I am not using a system tiddler, as they are not loaded 
by Syncadapter.

The description of Syncadaptor is ambiguous 
(https://tiddlywiki.com/dev/#Syncadaptor): "provides functionality ... to 
load, save and delete single tiddlers ... honours a special system tiddler 
$:/config/SyncFilter containing a filter string. Tiddlers matching this 
filter string are not synced with a syncadapter." The reality is that it 
uses the *$:/config/SyncFilter* filter when saving *from* *browser to 
server*, but ignores all system tiddlers when syncing *from* *server to 
browser* (by using */recipes/default/tiddlers.json*).

[image: tiddly-sync.png]

*(Not a real UML, but I hope it helps understanding.)*

As far as I can track back in Git history, filtering system tiddlers is 
intentional (and logical), but not mentioned in the documentation.

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Re: [twdev] Re: How to use Node modules in browser?

[Jeremy Ruston]

Hi Bimlas

>> To make the browser to pick up changes from the server then you can trigger 
>> polling with the tm-server-refresh message. In my own experiments I often 
>> just change the default polling interval from 60s down to 3-5s (via 
>> $:/config/SyncPollingInterval).
>  
> I'm afraid something is wrong: I created a new wiki ("tiddlywiki --init 
> server"), made a tiddler, changed the text on the file system and issued the 
> $tw.rootWidget.dispatchEvent({type: "tm-server-refresh"}) command in the 
> browser console, but the tiddler has not been updated.

TW5 doesn't support external changes to the filesystem. You should use the HTTP 
API to create/update tiddlers.

> PS.: $:/config/SyncPollingInterval could be documented at 
> https://tiddlywiki.com/#Hidden%20Settings if you agree.

Yes, it should be documented there.

Best wishes

Jeremy

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

I also tried Node 12.9.1 installed through NVM, which is the result.

Need to create a skinny tiddler and it will be synced? As far as I know it 
doesn't work with text files:

$ mkdir files
$ echo "Some text" > ./files/foo.txt
$ tiddlywiki --listen


   - Check that http://localhost:8080/files/foo.txt works by opening it in 
   browser
   - Create a new tiddler with _canonical_uri: ./files/foo.txt
   - It says "Trying to load external content from ./files/foo.tid", file 
   is not found
   - Set type: text/plain
   - The text is empty, so the file is not found

To sum up my thoughts:

I want to solve the communication between browser and server by modifying a 
tiddler, which I see on both sides, and if I change it, the other party 
updates itself. Server side modification works, only browser side update is 
missing. This requires the syncadaptor to load the tiddlers from the file 
system at intervals or for a specific event. This does not seem to work, it 
updates only skinny tiddlers, but they do not work with text files.

At the moment, I see the only workable solution is 
$tw.syncer.enqueueSyncTask({type: 
"load", title: "New Tiddler"}).

Am I right? If not, what do I do wrong?

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

Jeremy,

To make the browser to pick up changes from the server then you can trigger 
> polling with the tm-server-refresh message. In my own experiments I often 
> just change the default polling interval from 60s down to 3-5s 
> (via $:/config/SyncPollingInterval).
>
 
I'm afraid something is wrong: I created a new wiki ("tiddlywiki --init 
server"), made a tiddler, changed the text on the file system and issued 
the $tw.rootWidget.dispatchEvent({type: "tm-server-refresh"}) command in 
the browser console, but the tiddler has not been updated.

I also set the configuration value as you wrote it, restarted the Node 
server, and saw in the console that it searches for changes at specified 
intervals ("syncer-browser-tiddlyweb: retrieving skinny tiddler list"), but 
the tiddler did not take over the file system changes made.

Called $tw.syncer.syncFromServer() directly, same results.

The only solution that really updated it is the 
$tw.syncer.enqueueSyncTask({type: 
"load", title: "New Tiddler"}) command issued in the browser.

$ tiddlywiki --version
5.1.20
$ node --version
v8.10.0

Is it possible that Node 10 is needed for proper operation?

You may also be interested in this pending PR which attempts to address 
> some of these issues by introducing a new framework for invoking external 
> tasks on the server:
>
> https://github.com/Jermolene/TiddlyWiki5/pull/3461
>

It looks promising, but I'm not digging into it yet if I'm so close to the 
goal. In fact, maybe this may be closer to my needs if I really understand 
what it is: https://github.com/Jermolene/TiddlyWiki5/pull/4123 

PS.: $:/config/SyncPollingInterval could be documented at 
https://tiddlywiki.com/#Hidden%20Settings if you agree.

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Re: [twdev] Re: How to use Node modules in browser?

[Jeremy Ruston]

Hi Bimlas

To make the browser to pick up changes from the server then you can trigger 
polling with the tm-server-refresh message. In my own experiments I often just 
change the default polling interval from 60s down to 3-5s (via 
$:/config/SyncPollingInterval).

You may also be interested in this pending PR which attempts to address some of 
these issues by introducing a new framework for invoking external tasks on the 
server:

https://github.com/Jermolene/TiddlyWiki5/pull/3461

Best wishes

Jeremy

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https://jermolene.com

>> On 27 Aug 2019, at 13:32, bimlas  wrote:
> 
> I think I found the solution: I have to use this (after the tiddler is 
> modified) in the browser (by an ActionWidget for example):
> 
>   $tw.utils.nextTick(function() {
> $tw.syncer.enqueueSyncTask({type: "load", title: 
> "$:/communicate-with-server"})
>   });
> 
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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

I think I found the solution: I have to use this (after the tiddler is 
modified) in the browser (by an ActionWidget for example):

  $tw.utils.nextTick(function() {
$tw.syncer.enqueueSyncTask({type: "load", title: 
"$:/communicate-with-server"})
  });

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

Jeremy,

... have the browser create a tiddler with some flags that gets synced to 
> the server. The serverside code picks up the tiddler (by searching for the 
> same flags), and then performs some operation, putting the results back in 
> the same tiddler.
>

 So far it works so that the server receives the query and executes the 
change, but how can I "upload" the changes? On the file system I can see 
that the tiddler has changed, but how can I update it in the browser? There 
I still see the query, not the response.

Example code:

* Create a new directory and cd into it
* `npm init && npm install --save tiddlywiki`
* Create `index.js` with this content:

// Start TiddlyWiki
var $tw = require('tiddlywiki').TiddlyWiki();
$tw.boot.argv = ['gui', '--listen'];
$tw.boot.boot(function() {});

$tw.wiki.addEventListener("change", function (changedTiddlers) {
  if (!"$:/communicate-with-server" in changedTiddlers) return;
  var tiddler = $tw.wiki.getTiddler("$:/communicate-with-server");
  if (!tiddler || (tiddler.fields["sender"] === "server")) return;
  console.log("Query got from browser");

  var query = tiddler.fields.text;
  var response = $tw.wiki.getModificationFields();
  response["sender"] = "server";
  
  // Parse query...
  console.log("Original query:" + query);
  response.text = query.toUpperCase();
  
  $tw.wiki.addTiddler(new $tw.Tiddler(tiddler,response));
});

* `node index.js`
* Create "$:/communicate-with-server" and write something in it

When you save it, it notifies you in the terminal (where Node is running) 
that it has received a request from the browser and executes the change 
(capitalizing the text), saves the file, but the browser knows nothing 
about it: it still does shows the version in memory. (If you want to send a 
request again, make sure the "sender" field is cleared)

How do I get the browser to read the file system change? And how do I tell 
the browser when the change was made (so I don't have to use a timer after 
I send the request)?


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Re: [twdev] Re: How to use Node modules in browser?

[Brian Theado]

Bimlas,

If the npm modules you want are compatible with the browser, then you can
bundle them into a tiddler and load them directly in the browser. It can be
tricky to get it working.  I've had the most success using browserify
--standalone
to get it bundled in a way that it will work with TW's require. If the
library provides a umd bundle, I think that usually that works as well.
I've also used webpack before to bundle the code.

But if the module needs to execute functionality only available in node,
then Jeremy's suggestion is the way to go.

Brian

On Thu, Jul 11, 2019 at 6:55 AM bimlas  wrote:

> The sync mechanism seems to be usable, I go around the topic, thank you
> for the idea!
>
> PS.: According to your comment
> ,
> if you would like GitLab saver to 5.1.20, please merge the request
> , otherwise mark it
> with "post-v5.1.20" just to give me some feedback. :)
>
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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

The sync mechanism seems to be usable, I go around the topic, thank you for 
the idea!

PS.: According to your comment 
, 
if you would like GitLab saver to 5.1.20, please merge the request 
, otherwise mark it 
with "post-v5.1.20" just to give me some feedback. :) 

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Re: [twdev] Re: How to use Node modules in browser?

[Jeremy Ruston]

Hi bimlas

> Maybe it's basically a bad way of thinking, so I am reformatting the 
> question: how can I use NPM modules in a widget?

Ah, OK, you’re asking if it is possible from the browser to invoke a function 
that is running on the server. That would be some kind of RPC mechanism, and we 
don’t have that, I’m afraid.

If you have something running in the browser that wants to talk to something on 
the server the simplest way to do it is to build on the sync mechanism: have 
the browser create a tiddler with some flags that gets synced to the server. 
The serverside code picks up the tiddler (by searching for the same flags), and 
then performs some operation, putting the results back in the same tiddler.

Alternatively, you can use websockets or serversentevents to communicate 
directly from code running in the browser to code running in the server.

Best wishes

Jeremy.

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

Maybe it's basically a bad way of thinking, so I am reformatting the 
question: how can I use NPM modules in a widget?

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Re: [twdev] Re: How to use Node modules in browser?

[bimlas]

Jeremy,

Thank you for your reply, but I still don't understand that although it can 
recognize Node in the code, $:/info/node is always "no" in the browser, so 
it does not load utils-node modules. How do I use them, for example, in 
widgets? For example, if I want to use the $tw.utils.getEditionInfo() 

 
method in my browser, how do I do it?

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Re: [twdev] Re: How to use Node modules in browser?

[Jeremy Ruston]

Hi bimlas

Apologies, I should have pointed out that $tw.node having the value {} does 
evaluate to true, as expected.

Best wishes

Jeremy

> On 11 Jul 2019, at 10:54, Jeremy Ruston  wrote:
> 
> Hi bimlas
> 
> $tw.boot.boot() is an async function, and takes a callback. TW won’t be fully 
> initialised until it gets to the callback. So try something like:
> 
> var $tw = require("./boot/boot.js").TiddlyWiki();
> 
> $tw.boot.argv = ['myproject', '--listen'];
> 
> $tw.boot.boot(function() {
>   console.log($tw.node);
>   console.log($tw.wiki.getTiddlerText('$:/info/node'));
> });
> 
> Best wishes
> 
> Jeremy
> 
>> On 11 Jul 2019, at 10:52, bimlas > > wrote:
>> 
>> To be clear: I need Node because I want to use NPM modules.
>> 
>> 2019. július 11., csütörtök 11:34:31 UTC+2 időpontban bimlas a következőt 
>> írta:
>> Dear all,
>> 
>> In a Node.js Javascript project, I want to use TiddlyWiki to display data.
>> 
>> To run Node methods, I need to create modules with "module-type: utils-node" 
>> (if I understand it well), thus I can reach them through $tw.utils. These 
>> will only be loaded by TiddlyWiki if $:/info/node is "yes" (so the value of 
>> $tw.node is not null). I have several Node wiki, checked in each (in the 
>> browser), but it seems that nowhere does it detects that the wiki is running 
>> under Node, because viewing $:/info/node in the browser says "no".
>> 
>> I'm confused, because if I check in the code, it detects that it is running 
>> under Node.
>> 
>> $tw.boot.argv = ['myproject', '--listen'];
>> $tw.boot.boot();
>> 
>> 
>> console.log($tw.node);
>> // {}
>> console.log($tw.wiki.getTiddlerText('$:/info/node'));
>> // yes
>> 
>> If I create a widget that uses this Node module, it doesn't work in the 
>> browser, instead of the widget, RSOD appears: $tw.utils.myNodeFunction is 
>> not a function
>> 
>> My question is how can I use the Node module in the browser?
>> 
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Re: [twdev] Re: How to use Node modules in browser?

[Jeremy Ruston]

Hi bimlas

$tw.boot.boot() is an async function, and takes a callback. TW won’t be fully 
initialised until it gets to the callback. So try something like:

var $tw = require("./boot/boot.js").TiddlyWiki();

$tw.boot.argv = ['myproject', '--listen'];

$tw.boot.boot(function() {
console.log($tw.node);
console.log($tw.wiki.getTiddlerText('$:/info/node'));
});

Best wishes

Jeremy

> On 11 Jul 2019, at 10:52, bimlas  wrote:
> 
> To be clear: I need Node because I want to use NPM modules.
> 
> 2019. július 11., csütörtök 11:34:31 UTC+2 időpontban bimlas a következőt 
> írta:
> Dear all,
> 
> In a Node.js Javascript project, I want to use TiddlyWiki to display data.
> 
> To run Node methods, I need to create modules with "module-type: utils-node" 
> (if I understand it well), thus I can reach them through $tw.utils. These 
> will only be loaded by TiddlyWiki if $:/info/node is "yes" (so the value of 
> $tw.node is not null). I have several Node wiki, checked in each (in the 
> browser), but it seems that nowhere does it detects that the wiki is running 
> under Node, because viewing $:/info/node in the browser says "no".
> 
> I'm confused, because if I check in the code, it detects that it is running 
> under Node.
> 
> $tw.boot.argv = ['myproject', '--listen'];
> $tw.boot.boot();
> 
> 
> console.log($tw.node);
> // {}
> console.log($tw.wiki.getTiddlerText('$:/info/node'));
> // yes
> 
> If I create a widget that uses this Node module, it doesn't work in the 
> browser, instead of the widget, RSOD appears: $tw.utils.myNodeFunction is not 
> a function
> 
> My question is how can I use the Node module in the browser?
> 
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[twdev] Re: How to use Node modules in browser?

[bimlas]

To be clear: I need Node because I want to use NPM modules.

2019. július 11., csütörtök 11:34:31 UTC+2 időpontban bimlas a következőt 
írta:
>
> Dear all,
>
> In a Node.js Javascript project, I want to use TiddlyWiki to display data.
>
> To run Node methods, I need to create modules with "module-type: 
> utils-node" (if I understand it well), thus I can reach them through 
> $tw.utils. These will only be loaded by TiddlyWiki if $:/info/node is "yes" 
> (so the value of $tw.node is not null). I have several Node wiki, checked 
> in each (in the browser), but it seems that nowhere does it detects that 
> the wiki is running under Node, because viewing $:/info/node in the browser 
> says "no".
>
> I'm confused, because if I check in the code, it detects that it is 
> running under Node.
>
> $tw.boot.argv = ['myproject', '--listen'];
> $tw.boot.boot();
>
>
> console.log($tw.node);
> // {}
> console.log($tw.wiki.getTiddlerText('$:/info/node'));
> // yes
>
> If I create a widget that uses this Node module, it doesn't work in the 
> browser, instead of the widget, RSOD appears: $tw.utils.myNodeFunction is 
> not a function
>
> My question is how can I use the Node module in the browser?
>

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