frappe_docker/development/README.md

# Getting Started

## Prerequisites

In order to start deveping you need to satisfy the folowing prerequisites:

- Docker
- docker-compose
- user added to docker group

It is recommended you allocate at least 4GB of RAM to docker:

- [Instructions for Windows](https://docs.docker.com/docker-for-windows/#resources)
- [Instructions for MacOOS](https://docs.docker.com/docker-for-mac/#resources)

## Bootstrap Containers for development

Clone and change directory to frappe_docker directory

```shell
git clone https://github.com/frappe/frappe_docker.git
cd frappe_docker
```

## Use VSCode Remote Containers extension

For most people getting started with Frappe development, the best solution is to use [ VSCode Remote - Containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers).

VSCode should automatically inquiry you to install the required extensions, that can also be installed manually as follows:

- Install Remote - Containers for VSCode
    - through command line `code --install-extension ms-vscode-remote.remote-containers`
    - clicking on the button at the following link: [Remote - Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
    - searching for extension `ms-vscode-remote.remote-containers`

After the extensions are installed, you can:

- Open frappe_docker folder in VS Code.
    - `code .`
- Launch the command, from Command Palette (Ctrl + Shift + P) `Execute Remote Containers : Reopen in Container`. You can also click in the bottom left corner to access the remote container menu.

Notes:

- The `development` directory is ignored by git. It is mounted and available inside the container. Create all your benches (installations of bench, the tool that manages frappe) inside this directory.
- nvm with node v12 and v10 is installed. Check with `nvm ls`. Node v12 is used by default.

### Setup first bench

Run the following commands in the terminal inside the container. You might need to create a new terminal in VSCode.

```shell
bench init --skip-redis-config-generation --frappe-branch version-12 frappe-bench
cd frappe-bench
```

### Setup hosts

We need to tell bench to use the right containers instead of localhost. Run the following commands inside the container:

```shell
bench set-mariadb-host mariadb
bench set-redis-cache-host redis-cache:6379
bench set-redis-queue-host redis-queue:6379
bench set-redis-socketio-host redis-socketio:6379
```

### Edit Honcho's Procfile

Honcho is the tool used by Bench to manage all the processes Frappe requires. Usually, these all run in localhost, but in this case, we have external containers for Redis. For this reason, we have to stop Honcho from trying to start Redis processes.

Open the Procfile file and remove the three lines containing the configuration from Redis, either by editing manually the file:

```shell
code Procfile
```

Or running the following command:
```shell
sed -i '/redis/d' ./Procfile
```

### Create a new site with bench

You can create a new site with the following command:

```shell
bench new-site sitename
```

for example:

```shell
bench new-site mysite.localhost
```

The same command can be run non-interactively as well:

```shell
bench new-site mysite.localhost --mariadb-root-password 123 --admin-password admin
```

The command will ask the MariaDB root password. The default root password is `123`.
This will create a new site and a `mysite.localhost` directory under `frappe-bench/sites`.
You may need to configure your system /etc/hosts if you're on Linux, Mac, or its Windows equivalent.

### Set bench developer mode on the new site

To develop a new app, the last step will be setting the site into developer mode. Documentation is available at [this link](https://frappe.io/docs/user/en/guides/app-development/how-enable-developer-mode-in-frappe).

```shell
bench --site mysite.localhost set-config developer_mode 1
bench --site mysite.localhost clear-cache
```

### Install an app

To install an app we need to fetch it from the appropriate git repo, then install in on the appropriate site:

You can check [VSCode container remote extension documentation](https://code.visualstudio.com/docs/remote/containers#_sharing-git-credentials-with-your-container) regarding git creedential sharing.

```shell
bench get-app myapp https://github.com/myusername/myapp.git
bench --site mysite.localhost install-app myapp
```

For example, to install ERPNext (from the master branch):

```shell
bench get-app erpnext https://github.com/frappe/erpnext.git
bench --site mysite.localhost install-app erpnext
```


### Start Frappe without debugging

Execute following command from the `frappe-bench` directory.

```shell
bench start
```

You can now login with user `Administrator` and the password you choose when creating the site.
Your website will now be accessible on [on port 8000](http://locahost:8000)
Note: To start bench with debugger refer section for debugging.

### Start Frappe with Visual Studio Code Python Debugging

To enable Python debugging inside Visual Studio Code, you must first install the `ms-python.python` extension inside the container. This should have already happened automatically, but depending on your VSCode config, you can force it by:

- Click on the extension icon inside VSCode
- Search `ms-python.python`
- Click on `Install on Dev Container: Frappe Bench`
- Click on 'Reload'

We need to start bench separately through the VSCode debugger. For this reason, **instead** of running `bench start` you should run the following command inside the frappe-bench directory:

```shell
honcho start \
    socketio \
    watch \
    schedule \
    worker_short \
    worker_long \
    worker_default
```

This command starts all processes with the exception of Redis (which is already running in separate container) and the `web` process. The latter can can finally be started from the debugger tab of VSCode by clicking on the "play" button.

You can now login with user `Administrator` and the password you choose when creating the site, if you followed this guide's unattended install that password is going to be `admin`.

## Developing using the interactive console

You can launch a simple interactive shell console in the terminal with:

```shell
ench --site mysite.localhost console
```

More likely, you may want to launch VSCode interactive console based on Jupyter kernel. 

Launch VSCode command palette (cmd+shift+p or ctrl+shift+p), run the command `Python: Select interpreter to start Jupyter server` and select `/workspace/development/frappe-bench/env/bin/python`.

The first step is installing and updating the required software. Usually the frappe framework may require an older version of Jupyter, while VSCode likes to move fast, this can [cause issues](https://github.com/jupyter/jupyter_console/issues/158). For this reason we need to run the following command.

```shell
/workspace/development/frappe-bench/env/bin/python -m pip install --upgrade jupyter ipykernel ipython
```

Then, run the commmand `Python: Show Python interactive window` from the VSCode command palette.

Replace `mysite.localhost` with your site and run the following code in a Jupyter cell:

```python 
import frappe
frappe.init(site='mysite.localhost', sites_path='/workspace/development/frappe-bench/sites')
frappe.connect()
frappe.local.lang = frappe.db.get_default('lang')
frappe.db.connect()
```

The first command can take a few seconds to be executed, this is to be expected.

### Fixing MariaDB issues after rebuilding the container

The `bench new-site` command creates a user in MariaDB with container IP as host, for this reason after rebuilding the container there is a chance that you will not be able to access MariaDB correctly with the previous configuration
The parameter `'db_name'@'%'` needs to be set in MariaDB and permission to the site database suitably assigned to the user.

This step has to be repeated for all sites available under the current bench.
Example shows the queries to be executed for site `localhost`

Open sites/localhost/site_config.json:


```shell
code sites/localhost/site_config.json
```

and take note of the parameters `db_name` and `db_password`.

Enter MariaDB Interactive shell:

```shell
mysql -uroot -p123 -hmariadb
```

Execute following queries replacing `db_name` and `db_password` with the values found in site_config.json.

```sql
UPDATE mysql.user SET Host = '%' where User = 'db_name'; FLUSH PRIVILEGES;
SET PASSWORD FOR 'db_name'@'%' = PASSWORD('db_password'); FLUSH PRIVILEGES;
GRANT ALL PRIVILEGES ON `db_name`.* TO 'db_name'@'%'; FLUSH PRIVILEGES;
EXIT;
```

## Manually start containers

In case you don't use VSCode, you may start the containers manually with the following command:

```shell
docker-compose -f .devcontainer/docker-compose.yml up -d
```

And enter the interactive shell for the development container with the following command:

```shell
docker exec -e "TERM=xterm-256color" -w /workspace/development -it devcontainer_frappe_1 bash
```