@absinthe/socket 中文文档教程

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@absinthe/socket

Absinthe Socket

• Features
• Installation
• Using npm
• Using yarn
• Types
• API
• cancel
  • Parameters
  • Examples
• create
  • Parameters
  • Examples
• observe
  • Parameters
  • Examples
• send
  • Parameters
  • Examples
• toObservable
  • Parameters
  • Examples
• unobserve
  • Parameters
  • Examples
• unobserveOrCancel
  • Parameters
  • Examples
• License

Features

• Immutable functional API > All received and returned objects with the exception of AbsintheSocket > instances (there are plans to make this immutable too) are treated in an > immutable way. Objects have no methods and instead we provide independant > stateless functions to interact with them.
• Lazy connect / join > If provided phoenix socket instance is not connected, then instead of > connecting at creation time, connection will be established on the next > invocation of send.
• Handle pending operations on connection lost > Pending mutations will be aborted, queries will be resent, and subscriptions > reestablished.
• Cancellable requests > Calling cancel removes given notifier from absintheSocket instance > and sends a Cancel event to all its observers and unsubscribes in case it > holds a subscription request.
• Operations deduplication > If an already sent request is given to send, then instead of sending > it again, the notifier associated with it will be returned.
• Observer support of recoverable errors > Since connection lost is handled, then two events needs to exist to represent > this fact: Error (recoverable), Abort (unrecoverable).
• Multiple observers per request > Calling send returns a notifier which allows attaching any number of > observers that will be notified when result arrives.
• Observer interaction depending on operation type > For the case of subscriptions, Start event is dispatched when the > subscription is established, while for the other types > (queries and mutations), when the request is sent.

Installation

Using npm

$ npm install --save phoenix @absinthe/socket

Using yarn

$ yarn add phoenix @absinthe/socket

Types

type RequestStatus = "canceled" | "canceling" | "pending" | "sent" | "sending";

// from @jumpn/utils-graphql
type GqlRequest<Variables: void | Object = void> = {
  operation: string,
  variables?: Variables
};

// from @jumpn/utils-graphql
type GqlResponse<Data> = {
  data?: Data,
  errors?: Array<GqlError>
};

// from @jumpn/utils-graphql
type GqlOperationType = "mutation" | "query" | "subscription";

type Observer<Result, Variables: void | Object = void> = {|
  onAbort?: (error: Error) => any,
  onCancel?: () => any,
  onError?: (error: Error) => any,
  onStart?: (notifier: Notifier<Result, Variables>) => any,
  onResult?: (result: Result) => any
|};

type Notifier<Result, Variables: void | Object = void> = {|
  activeObservers: $ReadOnlyArray<Observer<Result, Variables>>,
  canceledObservers: $ReadOnlyArray<Observer<Result, Variables>>,
  isActive: boolean,
  operationType: GqlOperationType,
  request: GqlRequest<Variables>,
  requestStatus: RequestStatus,
  subscriptionId?: string
|};

type AbsintheSocket = {|
  channel: Channel,
  channelJoinCreated: boolean,
  notifiers: Array<Notifier<any>>,
  phoenixSocket: PhoenixSocket
|};

API

cancel

取消通知器向其所有观察者发送 Cancel 事件，并且 如果它持有订阅请求则取消订阅

Parameters

• absintheSocket AbsintheSocket
• notifier Notifier<any, any>

Examples

import * as withAbsintheSocket from "@absinthe/socket";

withAbsintheSocket.cancel(absintheSocket, notifier);

>AbsintheSocket

create

给定的 Phoenix Socket 实例创建一个 Absinthe Socket

Parameters

• phoenixSocket PhoenixSocket

Examples

import * as withAbsintheSocket from "@absinthe/socket";
import {Socket as PhoenixSocket} from "phoenix";

const absintheSocket = withAbsintheSocket.create(
  new PhoenixSocket("ws://localhost:4000/socket")
);

< strong

observe

使用

Parameters

• absintheSocket AbsintheSocket
• notifier Notifier<Result, Variables>
• observer Observer<Result, Variables>

Examples

import * as withAbsintheSocket from "@absinthe/socket"

const logEvent = eventName => (...args) => console.log(eventName, ...args);

const updatedNotifier = withAbsintheSocket.observe(absintheSocket, notifier, {
  onAbort: logEvent("abort"),
  onError: logEvent("error"),
  onStart: logEvent("open"),
  onResult: logEvent("result")
});

send

返回 （通知程序）跟踪其进度 （参见 observe 函数）

Parameters

• absintheSocket AbsintheSocket
• request GqlRequest<Variables>

Examples

import * as withAbsintheSocket from "@absinthe/socket";

const operation = `
  subscription userSubscription($userId: ID!) {
    user(userId: $userId) {
      id
      name
    }
  }
`;

// This example uses a subscription, but the functionallity is the same for
// all operation types (queries, mutations and subscriptions)

const notifier = withAbsintheSocket.send(absintheSocket, {
  operation,
  variables: {userId: 10}
});

返回 Notifier

toObservable

创建一个将遵循给定通知程序的 Observable

Parameters

• absintheSocket AbsintheSocket
• notifier Notifier<Result, Variables>
• options Object? (optional, default {})
  • options.unsubscribe function (): undefined?
  • options.onError function (error: Error): undefined?
  • options.onStart function (notifier: Notifier<Result, Variables>): undefined?
  • options.handlers …any

Examples

import * as withAbsintheSocket from "@absinthe/socket";

const unobserveOrCancelIfNeeded = (absintheSocket, notifier, observer) => {
  if (notifier && observer) {
    withAbsintheSocket.unobserveOrCancel(absintheSocket, notifier, observer);
  }
};

const logEvent = eventName => (...args) => console.log(eventName, ...args);

const observable = withAbsintheSocket.toObservable(absintheSocket, notifier, {
  onError: logEvent("error"),
  onStart: logEvent("open"),
  unsubscribe: unobserveOrCancelIfNeeded
});

返回 Observable

unobserve

分离观察者

Parameters

• absintheSocket AbsintheSocket
• notifier Notifier<any, any>
• observer Observer<any, any>

Examples

import * as withAbsintheSocket from "@absinthe/socket";

withAbsintheSocket.unobserve(absintheSocket, notifier, observer);

从通知程序中

unobserveOrCancel

如果除了给定的观察者之外没有其他观察者，则取消通知程序，或者 将给定的观察者与通知者分离，否则

Parameters

• absintheSocket AbsintheSocket
• notifier Notifier<Result, Variables>
• observer Observer<Result, Variables>

Examples

import * as withAbsintheSocket from "@absinthe/socket";

withAbsintheSocket.unobserve(absintheSocket, notifier, observer);

License

MIT :copyright: Jumpn Limited。