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262 lines
12 KiB
JavaScript
262 lines
12 KiB
JavaScript
/* *******************************************************************************************
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* FEATHERS.JS CHEATSHEET
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* https://docs.feathersjs.com/api/readme.html
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*
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* 1. CORE: Feathers core functionality.
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* 2. TRANSPORT: Expose a Feathers application as an API server.
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* 3. CLIENT: More details on how to use Feathers on the client.
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* 4. AUTHENTICATION: Feathers authentication mechanism.
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* 5. DATABASE: Feathers common database adapter API and querying mechanism.
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* ******************************************************************************************* */
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/* *******************************************************************************************
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* 1. CORE: Feathers core functionality.
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* ******************************************************************************************* */
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```bash
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# Provides the ability to initialize new application instances
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npm install @feathersjs/feathers --save
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# Provides a set of standard error classes used by all other Feathers modules
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npm install @feathersjs/errors --save
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```
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const feathers = require('@feathersjs/feathers');
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const app = feathers(); // application initialization
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app.mixins // contains a list of service mixins
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app.use(path, service) // allows registering a service object on a given path
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app.service(path) // returns the wrapped service object for the given path
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app.hooks(hooks) // allows registration of application-level hooks
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app.publish([event,], publisher) // registers a global event publisher
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app.configure(callback) // runs a callback function that gets passed the application object
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app.listen(port) // starts the application on the given port
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app.setup([server]) // used to initialize all services by calling each services .setup(app, path) method (if available)
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app.set(name, value) // assigns setting name to value
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app.get(name) // retrieves the setting name
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app.on(eventname, listener) // registers a listener method for the given eventname
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app.emit(eventname, data) // emits the event eventname to all event listeners
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app.removeListener(eventname, [ listener ]) // removes all or the given listener for eventname
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// "Services" are the heart of every Feathers application.
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// Services are JavaScript objects (or instances of ES6 classes) that implement certain methods.
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// Feathers itself will also add some additional methods and functionality to its services.
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class MyService {
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// Retrieves a list of all resources from the service.
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// Provider parameters will be passed as params.query.
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async find(params) {
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return [];
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}
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// Retrieves a single resource with the given id from the service.
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async get(id, params) {}
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// Creates a new resource with data.
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// The method should return the newly created data. data may also be an array.
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async create(data, params) {}
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// Replaces the resource identified by id with data.
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// The method should return the complete, updated resource data.
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// id can also be null when updating multiple records, with params.query containing the query criteria.
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async update(id, data, params) {}
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// Merges the existing data of the resource identified by id with the new data.
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// id can also be null indicating that multiple resources should be patched with params.query containing the query criteria.
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async patch(id, data, params) {}
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// Removes the resource with id.
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// The method should return the removed resource.
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// id can also be null, which indicates the deletion of multiple resources, with params.query containing the query criteria.
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async remove(id, params) {}
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// A special method that initializes the service, passing an instance of the Feathers application
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// and the path it has been registered on.
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// For services registered before app.listen is invoked, the setup function of each registered service
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// is called on invoking app.listen. For services registered after app.listen is invoked, setup is
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// called automatically by Feathers when a service is registered.
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setup(app, path) {}
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}
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app.use('/my-service', new MyService());
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// Important: Always use the service returned by app.service(path)
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const myService = app.service('my-service');
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myService.hooks(hooks) // register hooks for this service
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myService.publish([event,], publisher) // register an event publishing callback
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myService.mixin(mixin) // extends the functionality of a service
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myService.on(eventname, listener) // registers a listener method for the given eventname
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myService.once(eventname, listener) // registers a listener method for the given eventname that will be triggered only one time
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myService.emit(eventname, data) // emits the event eventname to all event listeners
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myService.removeListener(eventname, [ listener ]) // removes all listeners (or the given listener) for eventname
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// Hooks are pluggable middleware functions that can be registered
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// before, after or on errors of a service method. You can register a
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// single hook function or create a chain of them to create complex work-flows.
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app.service('my-service').hooks({
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before: {
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all: [
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// Use normal functions
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function(context) { console.log('before all hook ran'); }
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],
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find: [
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// Use ES6 arrow functions
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context => console.log('before find hook 1 ran'),
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context => console.log('before find hook 2 ran')
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],
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async create (context) {
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return context
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},
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},
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after: {
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all: [],
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find: [],
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get: [],
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create: [],
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update: [],
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patch: [],
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remove: []
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},
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// Here is an example for a very useful application hook that logs every service method error
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// with the service and method name as well as the error stack
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error(context) {
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console.error(`Error in ${context.path} calling ${context.method} method`, context.error);
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}
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});
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context.app // [read only] contains the Feathers application object
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context.service // [read only] contains the service this hook currently runs on
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context.path // [read only] contains the service name (or path) without leading or trailing slashes
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context.method // [read only] contains the name of the service method (find, get, create, update...)
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context.type // [read only] contains the hook type (one of before, after or error)
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context.params // [writable] contains the service method parameters (including params.query)
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context.id // [writable] contains the id for a get, remove, update and patch service method call
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context.data // [writable] contains the data of a create, update and patch service method call
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context.error // [writable] contains the error object that was thrown in a failed method call (only available in error hooks)
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context.result // [writable] contains the result of the successful service method call (only available in after hooks)
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context.dispatch // [writable and optional] contains a "safe" version of the data that should be sent to any client
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// A channel is an object that contains a number of connections.
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// It can be created via app.channel and allows a connection to join or leave it.
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app.channel(name) // when given a single name, returns an existing or new named channel
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app.channel(name1, name2, ... nameN) // when given multiples names, will return a combined channel.
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app.channels // returns a list of all existing channel names
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channel.join(connection) // adds a connection to this channel
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channel.leave(connection|fn) // removes a connection from this channel
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channel.filter(fn) // returns a new channel filtered by a given function which gets passed the connection
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channel.send(data) // returns a copy of this channel with customized data that should be sent for this event
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channel.connections // contains a list of all connections in this channel
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channel.length // returns the total number of connections in this channel
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service.publish([event,] fn) // registers a publishing function for a specific service for a specific event or all events if no event name was given
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app.publish([event,] fn)
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app.on('connection', connection => {}) // fired every time a new real-time connection is established
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app.on('login', (payload, info) => {}) // sent by the authentication module and also contains the connection in the info object that is passed as the second parameter
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/* *******************************************************************************************
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* 2. TRANSPORT: Expose a Feathers application as an API server.
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* ******************************************************************************************* */
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```bash
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# Contains Express framework integrations
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npm install @feathersjs/express --save
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# Allows to call service methods and receive real-time events
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npm install @feathersjs/socketio --save
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# Allows to call service methods and receive real-time events via Primus
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npm install @feathersjs/primus --save
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```
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/* *******************************************************************************************
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* 3. CLIENT: More details on how to use Feathers on the client.
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* ******************************************************************************************* */
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```bash
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# Allows to connect to services through REST HTTP
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npm install @feathersjs/rest-client --save
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# Allows to connect to services through Socket.io
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npm install @feathersjs/socketio-client --save
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# Allows to connect to services through Primus
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npm install @feathersjs/primus-client --save
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# Allows you to easily authenticate against a Feathers server
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npm install @feathersjs/authentication-client --save
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```
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/* *******************************************************************************************
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* 4. AUTHENTICATION: Feathers authentication mechanism.
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* ******************************************************************************************* */
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```bash
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# Assists in using JWT for authentication
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npm install @feathersjs/authentication --save
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# Wraps the passport-local authentication strategy (username and password)
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npm install @feathersjs/authentication-local --save
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# Wraps the passport-jwt authentication strategy (JSON Web Token access token)
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npm install @feathersjs/authentication-jwt --save
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# Allows you to use any Passport OAuth1 authentication strategy (most notably Twitter)
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npm install @feathersjs/authentication-oauth1 --save
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# Allows you to use any Passport OAuth2 authentication strategy (FB, Instagram, Github, Google...)
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npm install @feathersjs/authentication-oauth2 --save
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```
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/* *******************************************************************************************
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* 5. DATABASE: Feathers common database adapter API and querying mechanism.
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* ******************************************************************************************* */
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```bash
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# [MEMORY/FILESYSTEM] In-memory database adapter
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npm install feathers-memory --save
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# [MEMORY/FILESYSTEM] Database adapter for NeDB an in-memory or file system based standalone database
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npm install feathers-nedb --save
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# [MEMORY/FILESYSTEM] Adapter for Client side Feathers that can use the browsers LocalStorage or ReactNative's AsyncStorage
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npm install feathers-localstorage --save
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# [SQL] Adapter for KnexJS, an SQL query builder for NodeJS supporting PostgreSQL, MySQL, SQLite and MSSQL
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npm install feathers-knex --save
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# [SQL] Adapter for Sequelize an ORM for NodeJS supporting PostgreSQL, MySQL, SQLite and MSSQL
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npm install feathers-sequelize --save
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# [NOSSQL] Database adapter for MongoDB using the official NodeJS database driver
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npm install feathers-mongodb --save
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# [NOSSQL] Database adapter for Mongoose an Object Modelling library for NodeJS and MongoDB
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npm install feathers-mongoose --save
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# [NOSSQL] Database adapter for Elasticsearch
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npm install feathers-elasticsearch --save
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# [NOSSQL] Database adapter for RethinkDB a real-time database.
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npm install feathers-rethinkdb --save
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```
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