Developing on Windows

We don’t actively support development on Windows, instead preferring MacOS or Linux.

However, Microsoft has recently been stabilizing their Windows Subsystem for Linux, which appears to work reasonably well for development.

Installation instructions are mostly the same as they written in the README with a couple of caveats as of time of writing (2019-07-25), noted below.

Installing Ubuntu in the Windows Subsystem for Linux.

For the rest of this document we’re going to presume that you’re using Ubuntu (18.04) in WSL. Medic probably works on all distributions, but Ubuntu is likely the best supported.

First, follow Microsoft’s instructions on enabling and installing linux. At the end of this process you should have a linux terminal.

CouchDB

As of writing CouchDB wouldn’t autostart (due to systemd not existing?), and wasn’t manually starting due to erlang errors.

Luckily, there is a perfectly working CouchDB installation for Windows:

• Download from CouchDB and install the Windows version. This will create a Windows service.
• Run it either by directly executing C:\CouchDB\bin\couchdb.cmd or by starting the service

Then go to http://localhost:5984/_utils/#/setup in Windows and do the single node setup. Once done head back to linux and confirm it works:

$: curl http://localhost:5984/
{"couchdb":"Welcome","version":"2.3.1","git_sha":"c298091a4","uuid":"5f60350abaaa11c0131a5630e83ae979","features":["pluggable-storage-engines","scheduler"],"vendor":{"name":"The Apache Software Foundation"}}

Installing NPM

Start your WSL instance (Ubuntu), not WSL as they take you to two different default directories.

The default npm in linux is really old and doesn’t have npm ci, which we need.

Instead use nvm to install nvm install 11.3 .

Checking out the code

We used git that’s preinstalled with Ubuntu to check out the code.

You can checkout cht code inside WSL itself. You can checkout anywhere you have write access. We’ll checkout inside /home/username/medic directory.

$: mkdir ~/medic && cd ~/medic
$: git clone https://github.com/medic/cht-core.git

Setup Environment Variables

Using .bashrc works as expected, and so is a good place to put exports:

# Medic stuff
export COUCH_URL=http://admin:pass@localhost:5984/medic
export COUCH_NODE_NAME=couchdb@localhost

Everything else

npm ci should just work once you’ve installed a latest version of node via nvm as noted above.

Also install xstproc in your WSL:

$: sudo apt-get update
$: sudo apt-get install xsltproc

Now you can build the web app.

$: cd ~/medic/cht-core/
$: npm ci
$: npm run build-dev-watch

From this point, follow the harden couch section in Core Developer Setup.

To get multiple linux terminals (so you can run npm run, api and sentinel at the same time) either install and use something like Tmux, or if you click Ubuntu in the Windows start menu again it will open up a new terminal in the same linux instance.

Once you’re done with the default instructions and have api running, check if it works by going to http://localhost:5988 in Chrome or Firefox.

Editing Code

If you want to make changes to your code or contribute to our community health toolkit, you can do so by editing code from your favorite editor. If you editor supports UNC path, you can access and edit files inside WSL from \\wsl$\Ubuntu\<cht-core-location>. If you use Visual Studio Code, it’s even easier to edit your code. Just navigate to where you have checked out cht-core and type code . This will download VS Code Server for Ubuntu and open the project in Visual Studio Code in windows.

$: cd ~/medic/cht-core
$: code .

Default port and credentials for cht-core web

The default launch port for cht-core is 5988, which can be changed by providing the environment variable at runtime API_PORT, for example: API_PORT=6000 node server.js.

The deployed web app’s default user name and password is the username and password we set for CouchDB in the initial steps.

Problems?

As none of our code developers use Windows as a development environment daily this solution may not be as stable as directly using MacOS or Linux. If you encounter issues please let a developer know