seneca alternatives and similar modules
Based on the "Web Frameworks" category.
Alternatively, view seneca alternatives based on common mentions on social networks and blogs.
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Nest
A progressive Node.js framework for building efficient, scalable, and enterprise-grade server-side applications with TypeScript/JavaScript ๐ -
Nuxt.js
DISCONTINUED. Nuxt is an intuitive and extendable way to create type-safe, performant and production-grade full-stack web apps and websites with Vue 3. [Moved to: https://github.com/nuxt/nuxt] -
AdonisJs Framework
AdonisJS is a TypeScript-first web framework for building web apps and API servers. It comes with support for testing, modern tooling, an ecosystem of official packages, and more. -
Quick Start
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Encore
Open Source Development Platform for building robust type-safe distributed systems with declarative infrastructure -
Derby
MVC framework making it easy to write realtime, collaborative applications that run in both Node.js and browsers -
NestJS REST API boilerplate
NestJS boilerplate. Auth, TypeORM, Mongoose, Postgres, MongoDB, Mailing, I18N, Docker. -
ActionHero
Actionhero is a realtime multi-transport nodejs API Server with integrated cluster capabilities and delayed tasks -
Lad
Node.js framework made by a former @expressjs TC and @koajs team member. Built for @forwardemail, @spamscanner, @breejs, @cabinjs, and @lassjs. -
Marble.js
Marble.js - functional reactive Node.js framework for building server-side applications, based on TypeScript and RxJS. -
lychee.js
DISCONTINUED. :seedling: Next-Gen AI-Assisted Isomorphic Application Engine for Embedded, Console, Mobile, Server and Desktop -
Hemera
๐ฌ Writing reliable & fault-tolerant microservices in Node.js https://hemerajs.github.io/hemera/ -
Catberry
Catberry is an isomorphic framework for building universal front-end apps using components, Flux architecture and progressive rendering. -
dawson-cli
DISCONTINUED. A serverless web framework for Node.js on AWS (CloudFormation, CloudFront, API Gateway, Lambda) -
AdonisJs Application
DISCONTINUED. This repo is the pre-configured project structure to be used for creating ambitious web servers using AdonisJs. -
QueryQL
Easily add filtering, sorting, and pagination to your Node.js REST API through your old friend: the query string! -
express-version-route
A Node.js express middleware that implements API versioning for route controllers -
FortJs
A feature-rich Node.js web framework designed for building powerful, scalable, and maintainable web applications. -
Prim+RPC
Easy-to-understand, type-safe, transport-agnostic RPC/IPC for JavaScript, supporting callbacks, batching, file handling, custom serialization, and more.
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README
A Node.js toolkit for Microservice architectures
This open source module is sponsored and supported by Voxgig. |
---|
seneca
- Lead Maintainer: Richard Rodger
- Sponsor: voxgig
Seneca is a toolkit for writing microservices and organizing the business logic of your app. You can break down your app into "stuff that happens", rather than focusing on data models or managing dependencies.
Seneca provides,
pattern matching: a wonderfully flexible way to handle business requirements
transport independence: how messages get to the right server is not something you should have to worry about
maturity: 8 years in production (before we called it microservices), but was once taken out by lightning
plus: a deep and wide ecosystem of plugins
book: a guide to designing microservice architectures: taomicro
Use this module to define commands that work by taking in some JSON, and, optionally, returning some JSON. The command to run is selected by pattern-matching on the the input JSON. There are built-in and optional sets of commands that help you build Minimum Viable Products: data storage, user management, distributed logic, caching, logging, etc. And you can define your own product by breaking it into a set of commands - "stuff that happens". That's pretty much it.
If you're using this module, and need help, you can:
- Post a github issue,
- Tweet to @senecajs,
- Ask on the Gitter.
If you are new to Seneca in general, please take a look at senecajs.org. We have everything from tutorials to sample apps to help get you up and running quickly.
Seneca's source can be read in an annotated fashion by running npm run annotate
. An
annotated version of each file will be generated in ./docs/
.
Install
To install via npm,
npm install seneca
Quick Example
'use strict'
var Seneca = require('seneca')
// Functionality in seneca is composed into simple
// plugins that can be loaded into seneca instances.
function rejector () {
this.add('cmd:run', (msg, done) => {
return done(null, {tag: 'rejector'})
})
}
function approver () {
this.add('cmd:run', (msg, done) => {
return done(null, {tag: 'approver'})
})
}
function local () {
this.add('cmd:run', function (msg, done) {
this.prior(msg, (err, reply) => {
return done(null, {tag: reply ? reply.tag : 'local'})
})
})
}
// Services can listen for messages using a variety of
// transports. In process and http are included by default.
Seneca()
.use(approver)
.listen({type: 'http', port: '8260', pin: 'cmd:*'})
Seneca()
.use(rejector)
.listen(8270)
// Load order is important, messages can be routed
// to other services or handled locally. Pins are
// basically filters over messages
function handler (err, reply) {
console.log(err, reply)
}
Seneca()
.use(local)
.act('cmd:run', handler)
Seneca()
.client({port: 8270, pin: 'cmd:run'})
.client({port: 8260, pin: 'cmd:run'})
.use(local)
.act('cmd:run', handler)
Seneca()
.client({port: 8260, pin: 'cmd:run'})
.client({port: 8270, pin: 'cmd:run'})
.use(local)
.act('cmd:run', handler)
// Output
// null { tag: 'local' }
// null { tag: 'approver' }
// null { tag: 'rejector' }
Running
To run normally, say in a container, use
$ node microservice.js
(where microservice.js
is a script file that uses Seneca).
Logs are output in JSON format so you can send them to a logging service.
To run in test mode, with human-readable, full debug logs, use:
$ node microservice.js --seneca.test
Why we built this?
So that it doesn't matter,
- who provides the functionality,
- where it lives (on the network),
- what it depends on,
- it's easy to define blocks of functionality (plugins!).
So long as some command can handle a given JSON document, you're good.
Here's an example:
var seneca = require('seneca')()
seneca.add({cmd: 'salestax'}, function (msg, done) {
var rate = 0.23
var total = msg.net * (1 + rate)
done(null, {total: total})
})
seneca.act({cmd: 'salestax', net: 100}, function (err, result) {
console.log(result.total)
})
In this code, whenever seneca sees the pattern {cmd:'salestax'}
, it executes the
function associated with this pattern, which calculates sales tax. There is nothing
special about the property cmd
. It is simply the property we want to pattern match.
You could look for foo
for all seneca cares! Yah!
The seneca.add
method adds a new pattern, and the function to execute whenever that
pattern occurs.
The seneca.act
method accepts an object, and runs the command, if any, that matches.
Where does the sales tax rate come from? Let's try it again:
seneca.add({cmd: 'config'}, function (msg, done) {
var config = {rate: 0.23}
var value = config[msg.prop]
done(null, {value: value})
})
seneca.add({cmd: 'salestax'}, function (msg, done) {
seneca.act({cmd: 'config', prop: 'rate'}, function (err, result) {
var rate = parseFloat(result.value)
var total = msg.net * (1 + rate)
done(null, {total: total})
})
})
seneca.act({cmd: 'salestax', net: 100}, function (err, result) {
console.log(result.total)
})
The config
command provides you with your configuration. This is cool because it
doesn't matter where it gets the configuration from - hard-coded, file system,
database, network service, whatever. Did you have to define an abstraction API to make
this work? Nope.
There's a little but too much verbosity here, don't you think? Let's fix that:
seneca.act('cmd:salestax,net:100', function (err, result) {
console.log(result.total)
})
Instead of providing an object, you can provide a string using an [abbreviated form][Jsonic] of JSON. In fact, you can provide both:
seneca.act('cmd:salestax', {net: 100}, function (err, result) {
console.log(result.total)
})
This is a very convenient way of combining a pattern and parameter data.
Programmer Anarchy
The way to build Node.js systems, is to build lots of little processes. Here's a great talk explaining why you should do this: Programmer Anarchy.
Seneca makes this really easy. Let's put configuration out on the network into its own process:
seneca.add({cmd: 'config'}, function (msg, done) {
var config = {rate: 0.23}
var value = config[msg.prop]
done(null, { value: value })
})
seneca.listen()
The listen
method starts a web server that listens for JSON
messages. When these arrive, they are submitted to the local Seneca
instance, and executed as actions in the normal way. The result is
then returned to the client as the response to the HTTP
request. Seneca can also listen for actions via a message bus.
Your implementation of the configuration code stays the same.
The client code looks like this:
seneca.add({cmd: 'salestax'}, function (msg, done) {
seneca.act({cmd: 'config', prop: 'rate' }, function (err, result) {
var rate = parseFloat(result.value)
var total = msg.net * (1 + rate)
done(null, { total: total })
})
})
seneca.client()
seneca.act('cmd:salestax,net:100', function (err, result) {
console.log(result.total)
})
On the client-side, calling seneca.client()
means that Seneca will
send any actions it cannot match locally out over the network. In this
case, the configuration server will match the cmd:config
pattern and
return the configuration data.
Again, notice that your sales tax code does not change. It does not need to know where the configuration comes from, who provides it, or how.
You can do this with every command.
Keeping the Business Happy
The thing about business requirements is that they have no respect for common sense, logic or orderly structure. The real world is messy.
In our example, let's say some countries have single sales tax rate, and others have a variable rate, which depends either on locality, or product category.
Here's the code. We'll rip out the configuration code for this example.
// fixed rate
seneca.add({cmd: 'salestax'}, function (msg, done) {
var rate = 0.23
var total = msg.net * (1 + rate)
done(null, { total: total })
})
// local rates
seneca.add({cmd: 'salestax', country: 'US'}, function (msg, done) {
var state = {
'NY': 0.04,
'CA': 0.0625
// ...
}
var rate = state[msg.state]
var total = msg.net * (1 + rate)
done(null, {total: total})
})
// categories
seneca.add({ cmd: 'salestax', country: 'IE' }, function (msg, done) {
var category = {
'top': 0.23,
'reduced': 0.135
// ...
}
var rate = category[msg.category]
var total = msg.net * (1 + rate)
done(null, { total: total })
})
seneca.act('cmd:salestax,net:100,country:DE', function (err, result) {
console.log('DE: ' + result.total)
})
seneca.act('cmd:salestax,net:100,country:US,state:NY', function (err, result) {
console.log('US,NY: ' + result.total)
})
seneca.act('cmd:salestax,net:100,country:IE,category:reduced', function (err, result) {
console.log('IE: ' + result.total)
})
In this case, you provide different implementations for different patterns. This lets you isolate complexity into well-defined places. It also means you can deal with special cases very easily.
Contributing
The Senecajs org encourages participation. If you feel you can help in any way, be it with bug reporting, documentation, examples, extra testing, or new features feel free to create an issue, or better yet, submit a Pull Request. For more information on contribution please see our Contributing guide.
Test
To run tests locally,
npm run test
To obtain a coverage report,
npm run coverage; open docs/coverage.html
License
Copyright (c) 2010-2018 Richard Rodger and other contributors; Licensed under [MIT][Lic].
*Note that all licence references and agreements mentioned in the seneca README section above
are relevant to that project's source code only.