# Nginx Sablier Plugin

The Nginx Sablier Plugin is a javascript file that runs through the NJS Module.

## Provider compatibility grid

| Provider                                | Dynamic | Blocking |
| --------------------------------------- | :-----: | :------: |
| [Docker](/providers/docker)             |    ✅    |    ✅     |
| [Docker Swarm](/providers/docker_swarm) |    ✅    |    ✅     |
| [Kubernetes](/providers/kubernetes)     |    ❌    |    ❌     |


## Install the plugin to NGINX

1. Load the `ngx_http_js_module.so` in the main nginx config file `/etc/nginx/nginx.conf`
    ```nginx
    load_module modules/ngx_http_js_module.so;
    ```
2. Copy/volume the `sablier.js` file to `/etc/nginx/conf.d/sablier.js`

## Configure the plugin

Use this sample for your APIs

```nginx
js_import conf.d/sablier.js;

resolver 127.0.0.11 valid=10s ipv6=off;

server {
listen 80;

    subrequest_output_buffer_size 32k;

    # The internal location to reach sablier API
    set $sablierUrl /sablier;
    # Shared variable for default session duration
    set $sablierSessionDuration 1m;

    # internal location for sablier middleware
    # here, the sablier API is a container named "sablier" inside the same network as nginx
    location /sablier/ {
        internal;
        proxy_method GET;
        proxy_pass http://sablier:10000/;
    }

    # A named location that can be used by the sablier middleware to redirect
    location @whoami {
        # Use variable in order to refresh DNS cache
        set $whoami_server whoami;
        proxy_pass http://$whoami_server:80;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # The actual location to match your API
    # Will answer by a waiting page or redirect to your app if
    # it is already up
    location /dynamic/whoami {
        set $sablierDynamicShowDetails true;
        set $sablierDynamicRefreshFrequency 5s;
        set $sablierNginxInternalRedirect @whoami;
        set $sablierGroup my-group;
        set $sablierDynamicName "Dynamic Whoami";
        set $sablierDynamicTheme hacker-terminal;
        js_content sablier.call;
    }
}
```

### Available variables

You can configure the middleware behavior with the following variables:

**General Configuration**

- `set $sablierUrl` The internal routing to reach Sablier API
- `set $sablierGroup` Group name to use to filter by label, ignored if sablierNames is set
- `set $sablierSessionDuration` The session duration after which containers/services/deployments instances are shutdown
- `set $sablierNginxInternalRedirect` The internal location for the service to redirect e.g. @nginx

**Dynamic Configuration**

*if any of these variables is set, then all Blocking Configuration is ignored*

- `set $sablierDynamicName`
- `set $sablierDynamicShowDetails` Set to true or false to show details specifcally for this middleware, unset to use Sablier server defaults
- `set $sablierDynamicTheme` The theme to use
- `set $sablierDynamicRefreshFrequency` The loading page refresh frequency

**Blocking Configuration**

- `set $sablierBlockingTimeout` waits until services are up and running but will not wait more than `timeout`