[ANN] Reagent + Sente (+ Heroku) = Rente

[Henrik Mohr]

Hi guys,

If you want a sample on how to make the newest versions of Reagent, Sente (for web sockets) work together, want figwheel for ease of development, and deploy it to Heroku, take a look at my small demo project:

https://github.com/enterlab/rente

I use it myself as a template/basis for Proof-of-Concept projects, and plan to use it for production stuff later.

Comments/feedback/suggestions/enhancements are welcome!

Best,

Henrik

[gvim]

As per the documentation:

$ lein run

$ lein figwheel
Figwheel: focusing on build-ids (client)
Compiling ClojureScript.
Figwheel: Starting server at http://localhost:3449
Figwheel: Serving files from
'(resources|dev-resources|resources-index/dev)/public'
Compiling "resources/public/js/app.js" from ("src/rente/client" "dev")...
Compiling "resources/public/js/app.js" failed.
java.io.FileNotFoundException: resources/public/js/app.js (No such file
or directory)

gvim

[Henrik Mohr]

Thanks for your comment, please pull again and retry:

lein figwheel

Figwheel: focusing on build-ids (client)

Compiling ClojureScript.

Figwheel: Starting server at http://localhost:3449

Figwheel: Serving files from '(resources|dev-resources|resources-index/dev)/public'

Compiling "resources/public/js/app.js" from ("src/rente/client" "dev")...

Successfully compiled "resources/public/js/app.js" in 14.874 seconds.

notifying browser that file changed:  /js/app.js

notifying browser that file changed:  /js/out/goog/deps.js

notifying browser that file changed:  /js/out/rente/client/views.js

notifying browser that file changed:  /js/out/rente/client/ws.js

notifying browser that file changed:  /js/out/start.js

notifying browser that file changed:  /js/out/rente/client/app.js

Best regards,

Henrik

[Henrik Mohr]

On Wednesday, January 21, 2015 at 1:23:36 PM UTC+1, g vim wrote:

As per the documentation:

I've just revised the documentation, please follow the revised usage documentation.

I've changed the order of lein run/figwheel since the server won't serve files correctly (the first time the server runs) until figwheel has finished building client files.

So the order is now:

1. lein figwheel
   
2. wait for figwheel to finish
   
3. lein run
   
4. browser -> localhost:8080
   

[gvim]

Thanks. Working now. Great work!

Slightly OT: for low cost VPS hosting with only 512Mb or 1Gb RAM Node.js
is often the only option. A full-stack Clojurescript option built on
similar tech as Sente would be fantastic.

gvim

[Henrik Mohr]

Good to hear that! :)

OT: I'm supporting a production app with Clojure/ClojureScript/Datomic/Ring/Sente etc. on a Heroku 2X dyno having 1 GB of RAM.

It works like a charm!

Best,

Henrik

[gvim]

On 22/01/2015 07:01, Henrik Mohr wrote:
>
> OT: I'm supporting a production app with
> Clojure/ClojureScript/Datomic/Ring/Sente etc. on a Heroku 2X dyno having
> 1 GB of RAM.
> It works like a charm!
>
> Best,
> Henrik
>

What kind of load? Is a basic web app even do-able on a 1X dyno, ie.
512Mb RAM? It's just that the no-cost lead-in is such an attractive
proposition for more conservative clients.

gvim

[Henrik Mohr]

(still) a moderate load. Around 10-50 users online at the same time. Not an extreme load on the Datomic Peer library since not a whole lot of data is stored per user (well, not for all users at least). But the server does a lot of real time calculations all the time based on user actions.

And yes, you can easily fit a Rente app into a Heroku 1X dyno setup. I have 2 Rente-apps running with that configuration without any issues. Unfortunately they are both closed systems I've made for a customer, so can't show them to you (1 in production use, 1 being evaluated as as Proof of Concept).

The running 2X app is here: https://app.meewee.com

It's based on a hybrid of Rente and older tech.

Best,

Henrik

[Wei Hsu]

How are you running Datomic on Heroku?

[Henrik Mohr]

I'm not. The Datomic Transactor is on one of our own hosts.

[Henrik Mohr]

Rente has been upgraded to sente 1.4.0 (breaking change).

Best,

Henrik

[Henrik Mohr]

Rente just got a "Deploy to Heroku" button for easy clone/deployment:

https://github.com/enterlab/rente

A running demo of Rente can be found here:

https://enterlab-rente.herokuapp.com

Best,

Henrik

[Joe Kutner]

That's awesome. I'm really glad to see people using the Heroku button for projects like this.

Is there a reason you explicitly set the BUILDPACK_URL? Heroku should detect the `project.clj` and use the Clojure buildpack automatically (I was able to deploy like that when I tested it). If there was a problem please let me know and I'll see if we can fix it (I work for Heroku).

[Henrik Mohr]

Thanks Joe! :)

It's not the standard Clojure buildpack, that's the reason it has to be specified explicitly.

I actually started out having no env parameter in app.json. The result was a completely dead app.

After I added the variable it worked.

Best,

Henrik

[Joe Kutner]

The buildpack you show in the readme appears to be the standard buildpack (unless i'm overlooking something):
https://github.com/heroku/heroku-buildpack-clojure

I was able to pull the Git repo down and deploy successfully without setting BUILDPACK_URL.

What do you mean by "dead app"? Did it fail the compile process, or just fail to start the app after the compile?

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[Luposlip]

By "dead app" I mean an app with no compilation of cljs.

Perhaps only the "LEIN_BUILD_TASK": "package" parameter that is needed!