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https://github.com/feathersjs-ecosystem/feathers-batch
Batch multiple Feathers service calls into one
https://github.com/feathersjs-ecosystem/feathers-batch
Last synced: 3 months ago
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Batch multiple Feathers service calls into one
- Host: GitHub
- URL: https://github.com/feathersjs-ecosystem/feathers-batch
- Owner: feathersjs-ecosystem
- License: mit
- Created: 2015-05-14T23:40:37.000Z (about 9 years ago)
- Default Branch: release
- Last Pushed: 2023-12-01T00:37:04.000Z (7 months ago)
- Last Synced: 2023-12-18T02:38:26.294Z (7 months ago)
- Language: JavaScript
- Homepage:
- Size: 1.88 MB
- Stars: 97
- Watchers: 5
- Forks: 10
- Open Issues: 21
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: .github/contributing.md
- License: LICENSE
Lists
- awesome-feathersjs - feathers-batch - Batch multiple Feathers service calls into one (service) (Plugins / Scaling)
README
feathers-batch
[](https://github.com/feathersjs-ecosystem/feathers-batch/actions?query=workflow%3ACI)
[](https://david-dm.org/feathersjs-ecosystem/feathers-batch)
[](https://www.npmjs.com/package/feathers-batch)
[](http://slack.feathersjs.com)
> Batch multiple Feathers service calls into one
- [About](#about)
- [Service](#service)
- [Usage](#usage)
- [Batch calls](#batch-calls)
- [Authentication](#authentication)
- [Client](#client)
- [Usage](#usage-1)
- [Options](#options)
- [Parallelizing requests](#parallelizing-requests)
- [License](#license)
## About
`feathers-batch` allows to batch multiple service requests into one. This is useful for minimizing client side requests to any Feathers API and can additionally speed up batched requests by only [performing authentication once](#authentication).
It also comes with a client side module that automatically collects API requests from a [Feathers client]() into a batch.
`feathers-batch` consists of two parts:
- The server side [batch service](#service) to execute batch calls
- The client side [batch client](#client) to collect parallel requests from a [Feathers client]() into a batch service request
```
npm install feathers-batch --save
```
## Service
The batch service is a normal Feathers service that executes the batch calls.
### Usage
It can be registered by adding the following to your `src/services/index.js|ts`:
```js
const { BatchService } = require('feathers-batch');
module.exports = function (app) {
// ...
app.use('batch', new BatchService(app));
}
```
### Batch calls
Now multiple service calls can be made by sending a `create` (`POST`) call to `/batch` with a `{ calls: [] }` property. `calls` is an array in the same format as the [Socket.io direct connection](https://docs.feathersjs.com/api/client/socketio.html#direct-connection) events:
```js
{
"calls": [
[ "method", "serviceName", /* list of parameters */ ],
...
]
}
```
> __Note:__ When using a Feathers client with the [batch client](#client) this will be done automatically.
For example, the following will execute a batch call to `app.service('users').get(1, { query: { active: true } })` and `app.service('messages').find({ query: { userId } })`:
```js
{
"calls": [
[ "get", "users", 1, { active: true } ],
[ "find", "messages", { userId } ]
]
}
```
The return value will be the information as returned by [Promise.allSettled](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/allSettled):
```js
[
{
"status": : "fulfilled",
"value": { /* user object returned by app.service('users').get(1) */ }
}, {
"status": : "fulfilled",
"value": { /* page returned by app.service('messages').find({ query: { userId } }) */ }
}
]
```
If an error happened:
```js
[
{
"status": : "fulfilled",
"value": { /* user object returned by app.service('users').get(1) */ }
}, {
"status": : "rejected",
"reason": { /* error JSON or object with error message */ }
}
]
```
### Authentication
If you are batching authenticated requests, it is possible to perform the authentication step only once (instead of on every service call) in a batch by adding the [authenticate hook](https://docs.feathersjs.com/api/authentication/hook.html) to the batch service `create` method:
```js
app.service('batch').hooks({
before: {
create: [ authenticate('jwt') ]
}
});
```
## Client
`feathers-batch` also exports a client side module that can be used with [Feathers on the client](https://docs.feathersjs.com/api/client.html) that automatically collects multiple requests that are made at the same time into a single batch call. This works for any transport mechanism (REST, Socket.io etc.).
### Usage
Batching on the client can be enabled like this:
```js
// If your module loader supports the `browser` package.json field
import { batchClient } from 'feathers-batch';
// Alternatively
import { batchClient } from 'feathers-batch/client';
const client = feathers();
// configure Feathers client here
// `batchClient` should be configured *after*
// any other application level hooks
client.configure(batchClient({
batchService: 'batch'
}));
```
Now you can continue to make normal service calls and whenever possible they will be automatically combined into a batch (see [parallelizing requests](#parallelizing-requests) for more information).
### Options
The following options are available for the `batchClient`:
- `batchService` (*required*) - The name of the batch service
- `exclude` (*optional*) - An array of service names that should be excluded from batching
- `timeout` (*optional*) (default: `50`) - The number of milliseconds to wait when collecting parallel requests.
### Parallelizing requests
At the same time means e.g. multiple components making requests to the API in parallel. The following example will __NOT__ be collected into a batch since the calls run sequentially using `await`:
```js
const user = await client.service('users').get(userId);
const messages = await client.service('messages').find({
query: { userId }
});
```
If the requests are not dependent on each other and you want to batch them, [Promise.all](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all) needs to be used:
```js
const [ user, messages ] = await Promise.all([
client.service('users').get(userId),
client.service('messages').find({
query: { userId }
})
]);
```
## License
Copyright (c) 2020 Feathers contributors
Licensed under the [MIT license](LICENSE).