| 1 | import { EventEmitter } from 'node:events';
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| 2 | import { AnyFunction, AnyJson, JsonMap } from '@salesforce/ts-types';
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| 3 | export type Message = JsonMap;
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| 4 | export type Callback<T = unknown> = (...args: any[]) => T;
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| 5 | export type StatusResult = {
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| 6 | /**
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| 7 | * If the result of the streaming or polling client is expected to return a result
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| 8 | */
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| 9 | payload?: AnyJson;
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| 10 | /**
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| 11 | * Indicates to the streaming or polling client that the subscriber has what its needs. If `true` the client will end
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| 12 | * the messaging exchanges with the endpoint.
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| 13 | */
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| 14 | completed: boolean;
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| 15 | };
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| 16 | /**
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| 17 | * The subscription object returned from the cometd subscribe object.
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| 18 | */
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| 19 | export type CometSubscription = {
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| 20 | callback(callback: () => void): void;
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| 21 | errback(callback: (error: Error) => void): void;
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| 22 | };
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| 23 | /**
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| 24 | * Types for defining extensions.
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| 25 | */
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| 26 | export type StreamingExtension = {
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| 27 | /**
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| 28 | * Extension for outgoing message.
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| 29 | *
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| 30 | * @param message The message.
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| 31 | * @param callback The callback to invoke after the message is processed.
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| 32 | */
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| 33 | outgoing?: (message: JsonMap, callback: AnyFunction) => void;
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| 34 | /**
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| 35 | * Extension for the incoming message.
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| 36 | *
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| 37 | * @param message The message.
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| 38 | * @param callback The callback to invoke after the message is processed.
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| 39 | */
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| 40 | incoming?: (message: JsonMap, callback: AnyFunction) => void;
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| 41 | };
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| 42 | /**
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| 43 | * Function type for processing messages
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| 44 | */
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| 45 | export declare type StreamProcessor = (message: JsonMap) => StatusResult;
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| 46 | /**
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| 47 | * Comet client interface. The is to allow for mocking the inner streaming Cometd implementation.
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| 48 | * The Faye implementation is used by default but it could be used to adapt another Cometd impl.
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| 49 | */
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| 50 | export declare abstract class CometClient extends EventEmitter {
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| 51 | /**
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| 52 | * Disable polling features.
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| 53 | *
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| 54 | * @param label Polling feature label.
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| 55 | */
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| 56 | abstract disable(label: string): void;
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| 57 | /**
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| 58 | * Add a custom extension to the underlying client.
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| 59 | *
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| 60 | * @param extension The json function for the extension.
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| 61 | */
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| 62 | abstract addExtension(extension: StreamingExtension): void;
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| 63 | /**
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| 64 | * Sets an http header name/value.
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| 65 | *
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| 66 | * @param name The header name.
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| 67 | * @param value The header value.
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| 68 | */
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| 69 | abstract setHeader(name: string, value: string): void;
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| 70 | /**
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| 71 | * handshake with the streaming channel
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| 72 | *
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| 73 | * @param callback Callback for the handshake when it successfully completes. The handshake should throw
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| 74 | * errors when errors are encountered.
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| 75 | */
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| 76 | abstract handshake(callback: () => void): void;
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| 77 | /**
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| 78 | * Subscribes to Comet topics. Subscribe should perform a handshake if one hasn't been performed yet.
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| 79 | *
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| 80 | * @param channel The topic to subscribe to.
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| 81 | * @param callback The callback to execute once a message has been received.
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| 82 | */
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| 83 | abstract subscribe(channel: string, callback: (message: JsonMap) => void): CometSubscription;
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| 84 | /**
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| 85 | * Method to call to disconnect the client from the server.
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| 86 | */
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| 87 | abstract disconnect(): void;
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| 88 | }
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