Service

The main service file registers the service on the application as well as the hooks used on this service.

Registration

The service is added to the main application via app.use under the path you chose when creating the service. It usses the following options:

• methods - A list of methods available for external clients. You can remove methods that are not used or add your own custom methods. Not that this list also has to be updated in the client file.
• events - A list of additional custom events sent to clients.

In TypeScript the ServiceTypes interface defined in the declarations will also be extended with the correct service class type using the shared path as a key:

declare module '../../../declarations' {
  interface ServiceTypes {
    [testingPath]: TestingService
  }
}

Registering hooks

This file is also where service hooks are registered on the service. Depending on the selection, it commonly includes the authentication hook and hooks that validate and resolve the schemas from the service.schemas file.

// Initialize hooks
app.service(messagePath).hooks({
  around: {
    all: [
      authenticate('jwt'),
      schemaHooks.resolveExternal(messageExternalResolver),
      schemaHooks.resolveResult(messageResolver)
    ]
  },
  before: {
    all: [schemaHooks.validateQuery(messageQueryValidator), schemaHooks.resolveQuery(messageQueryResolver)],
    find: [],
    get: [],
    create: [schemaHooks.validateData(messageDataValidator), schemaHooks.resolveData(messageDataResolver)],
    patch: [schemaHooks.validateData(messagePatchValidator), schemaHooks.resolveData(messagePatchResolver)],
    remove: []
  },
  after: {
    all: []
  },
  error: {
    all: []
  }
})

Note that you can add hooks to a specific method as documented in the hook registration API. For example, to use the profiling hook only for find and get the registration can be updated like this:

import { profiler } from '../../hooks/profiler'
// ...

// Initialize hooks
app.service(messagePath).hooks({
  around: {
    all: [
      authenticate('jwt'),
      schemaHooks.resolveExternal(messageExternalResolver),
      schemaHooks.resolveResult(messageResolver)
    ],
    find: [profiler],
    get: [profiler]
  },
  before: {
    all: [schemaHooks.validateQuery(messageQueryValidator), schemaHooks.resolveQuery(messageQueryResolver)],
    find: [],
    get: [],
    create: [schemaHooks.validateData(messageDataValidator), schemaHooks.resolveData(messageDataResolver)],
    patch: [schemaHooks.validateData(messagePatchValidator), schemaHooks.resolveData(messagePatchResolver)],
    remove: []
  },
  after: {
    all: []
  },
  error: {
    all: []
  }
})

This also applies to any hook plugins like feathers-hooks-common.