A commercially supported ClojureScript platform by Degree9.
D9 Enterprise is developed and maintained by Degree9
This library is provided as an extension to degree9/meta.
Where [meta] only provides the basic application server/client, D9 Enterprise provides a collection of services which can be mounted to server endpoints, as well as helpful service hooks and client components.
This library supports nodejs process environment variables and dotenv.
There is a convenience namespace degree9.env that inits dotenv and exposes the
native nodejs functionality.
See .env.example in the root of the repository for an example that can be
copied into place and updated with real secrets.
degree9.env/get: Takes a key and optional fallback value, returns the value, fallback or empty string as appropriate. Accepts keyword and string keys in all casings. e.g.(degree9.env/get :home) ; "/Users/foo"` (degree9.env/get "HOME") ; "/Users/foo"`
degree9.env/keys: Returns the list of all available env map keywords.
Using shadow cljs + node + REPL is the easiest way to develop without including
and rebuilding enterprise as an embedded dependency of some other repository.
We can't reliably use the browser REPL approach because some code must be executed in node. For example, the Shopify API doesn't allow CORS, so browser based POST is not an option.
Shadow CLJS is being used simply because it seemed to provide what we need and I wasn't sure how to setup the equivalent through Boot.
All the REPL config for shadow is in shadow-cljs.edn.
The dependencies are being parsed from shadow-cljs.edn into build.boot.
The shadow CLJS docs are pretty good:
https://shadow-cljs.github.io/docs/UsersGuide.html
The default shadow cljs config is for app and targets node-script, but also
can support the browser target too (the config covers both options).
Nix can provide all the tooling needed to run tests and the repl.
This is how Circle CI is configured, using the official alpine based NixOS docker box.
If you don't already have nix-shell then install it:
https://nixos.org/nix/download.html
curl https://nixos.org/nix/install | sh
Nix will run npm install and set environment variables etc. when entering the shell.
This includes wrapping shadow-cljs so that it appears to be installed globally while in the shell (without installing it globally).
A few nix specific commands are available:
flush
Delete all built artifacts and dependencies that may become stale.
nix-shell --run flush
node-test
Run all the node tests under the :node-test shadow-cljs target.
nix-shell --run node-test
browser-test
Run all browser tests with karma against a headless firefox against the :browser-test shadow-cljs target.
On linux a copy of firefox will be shipped by nix-shell, on Mac you may need to BYO firefox.
nix-shell --run browser-test
Shadow CLJS is a dev dependency for npm in this repo.
It might be easier to install it globally though:
$ npm install -g shadow-cljs
First run watch to compile the needed JS file.
$ shadow-cljs watch app
This will start a REPL server, watch files and output to repl-node/main.js.
Next, in a new terminal tab, run the compiled file with node.
$ node repl-node/main.js
This will provide the execution context for the REPL, as a browser normally
would. All prn and console logs will show up here.
Finally, in a new terminal tab, start the CLJS REPL connected to the server.
$ shadow-cljs cljs-repl app
This allows for executing cljs code in the node execution environment.
Note that the watch command from shadow cljs WILL reload files dynamically but
does NOT automatically reload the state of namespaces from the perspective of
the REPL.
To reload an already-loaded namespace, use :reload or :reload-all.
For example:
(require 'degree9.repl :reload)
Would allow edits to degree9.repl/foo to appear in the REPL client without
needing to stop and start the REPL server.
Edit shadow-cljs.edn so that the :target for :app is :browser.
Run the watch command:
$ shadow-cljs watch app
This will output compiled browser-friendly JS files to repl-public/js/main.js.
A web server will also be available at http://localhost:8020.
Open a browser (e.g. Chrome) to the localhost web server URL. All prn and
console logs will show up here.
In a new terminal tab, start the browser REPL.
$ shadow-cljs browser-repl app
Be careful not to refresh the browser as it can mess with the state of the REPL.
To reload namespaces, see the node instructions above.
Shadow CLJS runs tests for us too, but uses the test build rather than app.
The node test runner in shadow CLJS does NOT need a standalone node instance
running as it is configured with :autorun.
$ shadow-cljs compile test
This only runs once though. The watch tool can help, install on Mac OS with
brew install watch and wrap shadow CLJS with it.
$ watch shadow-cljs compile test
D9 Enterprise is only supported for Enterprise tier patrons.
