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https://github.com/holtwick/zerva
🌱 Simple event driven server
https://github.com/holtwick/zerva
cors event-driven express http https javascript nodejs server services typed typescript zeed zerva
Last synced: 10 days ago
JSON representation
🌱 Simple event driven server
- Host: GitHub
- URL: https://github.com/holtwick/zerva
- Owner: holtwick
- License: mit
- Created: 2021-07-08T19:00:09.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2024-04-24T11:25:46.000Z (7 months ago)
- Last Synced: 2024-05-16T23:51:44.503Z (6 months ago)
- Topics: cors, event-driven, express, http, https, javascript, nodejs, server, services, typed, typescript, zeed, zerva
- Language: TypeScript
- Homepage:
- Size: 5.45 MB
- Stars: 18
- Watchers: 2
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
- Security: SECURITY.md
Awesome Lists containing this project
README
# 🌱 Zerva
**Minimal event driven web service infrastructure.**
## Get started
Set up your first project using this [template](https://github.com/holtwick/zerva-project-template/generate).
## How it works
It all starts with the `context` which is the common ground for any **module** we use or create. It serves as a hub/bus for emitting and listening on **events**.
Usually you would start to build a server like this:
```ts
import { useHttp } from '@zerva/http'
useHttp({
port: 8080
})
```
`serve` itself is a **module** that i.e. it is a function working on **context**. It takes a function to call other modules and provides a common lifecycle by emitting `serveInit` and `serveStart`. These are the entry points for other services.
`useHttp` for example will set up an [express]() server and start it on `serveStart`. It will emit `httpInit` before it starts and `httpRunning` when it is ready.
> By convention, we add `use` to module initializer to be able to identify them at first glance.
You can write your own module which can use `httpInit` to add some listeners:
```ts
function useCounter() {
let counter = 0
on('httpInit', ({ get }) => {
get('/counter', () => `Counter ${counter++}`)
})
}
```
As you can see a **module** is just a function connecting itself to the **context**. But where is the context? Well `context` is set globally. Similarly, as for Vue and React our helper routines like `on` or `emit` make use of it. This is a great simplification while still being a robust approach.
> If you want to use multiple **contexts** just wrap the code using it into `withContext(context, () => { /* your code */ })`.
On `httpInit` we make use of the http-modules specific `get` helper to answer to http-requests on `/counter`.
To make sure the `http` module is around as well in our context, it is good practice to register oneself and tell about dependencies using `register`:
```ts
function useCounter() {
register('counter', ['http'])
let counter = 1
on('httpInit', ({ get }) => {
get(
'/',
() => `Counter ${counter++}.
Reload page to increase counter.`
)
})
return {
getCounter: () => counter,
}
}
```
As you can see we can also return some custom data or functions from our module, like `getCounter` in our case.
That's basically it!
## Command line convenience
For convenience, you can use the `zerva` command line tool. It is based on [estrella](https://github.com/rsms/estrella) and translates your Typescript code on the fly without further configuration. It also watches for changes and restarts the server immediately. To build add `build` as first argument. The last argument can point to the entry file (Javascript or Typescript), otherwise `src/main.ts` will be used.
In your `package.json` you might want to add these lines:
```json
{
"scripts": {
"start": "zerva",
"build": "zerva build",
"serve": "node dist/main.cjs"
}
}
```
## Docker
Zerva integrates perfectly with Docker. Learn more at [demos/docker](https://github.com/holtwick/zerva/demos/docker).
## GitHub Templates
To get started, you can use these GitHub Templates:
- [Create your own Zerva module](https://github.com/holtwick/zerva-module-template/generate)
- [Create your own Zerva project](https://github.com/holtwick/zerva-project-template/generate)
## External Modules
- [@zerva/bin](./zerva-bin) - CLI tool
- [@zerva/core](./zerva-core) - The core of it all
- [@zerva/vite](./zerva-vite) - Vite integration
- [@zerva/plausible](./zerva-plausibe) - Visitors tracking using plausible.js
- [@zerva/umami](./zerva-umami) - Visitors tracking using umami.js
- [@zerva/websocket](./zerva-websocket) - Websockets
- [@zerva/socketio](./zerva-socketio) - Websockets using socket.io
- [@zerva/exit](./zerva-exit) - CTRL-C support
- [@zerva/qrcode](./zerva-qrcode) - Show QR Code for external IP addresses to simplify mobile development
## Advanced Topics
### Conditional building
Zerva uses [esbuild](https://esbuild.github.io) to create both the development server code and the production code. You can take advantage of conditional building using [defines](https://esbuild.github.io/api/#define). This can be used to have code that avoids certain imports or otherwise unneed stuff in production mode. I.e. in your code you can do stuff like this:
```ts
if (ZERVA_DEVELEPMENT) {
/* do something */
}
```
Valid defines are:
- `ZERVA_DEVELOPMENT` is `true` when started as `zerva`
- `ZERVA_PRODUCTION` is `true` when started as `zerva build`
For better compatibility the defines can also be accessed as `process.env.ZERVA_DEVELOPMENT` and `process.env.ZERVA_PRODUCTION`.
## Minimal Requirements
- Node: 16
- JS target: es2022
See [tsconfig/bases](https://github.com/tsconfig/bases) to learn details about the configuration considerations.
## Related Projects
- [zeed](https://github.com/holtwick/zeed) - Helper lib providing the logging for server
- [zeed-dom](https://github.com/holtwick/zeed-dom) - Lightweight offline DOM