74 lines
1.9 KiB
Swift
74 lines
1.9 KiB
Swift
//
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// Promise.swift
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// Cuvent
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//
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// Created by Marc Rousavy on 14.01.21.
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// Copyright © 2021 Facebook. All rights reserved.
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//
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import Foundation
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// MARK: - Promise
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/**
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* Represents a JavaScript Promise instance. `reject()` and `resolve()` should only be called once.
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*/
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class Promise {
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// MARK: Lifecycle
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init(resolver: @escaping RCTPromiseResolveBlock, rejecter: @escaping RCTPromiseRejectBlock) {
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self.resolver = resolver
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self.rejecter = rejecter
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}
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// MARK: Internal
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func reject(error: CameraError, cause: NSError?) {
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rejecter(error.code, error.message, cause)
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}
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func reject(error: CameraError) {
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reject(error: error, cause: nil)
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}
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func resolve(_ value: Any?) {
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resolver(value)
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}
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func resolve() {
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resolve(nil)
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}
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// MARK: Private
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private let resolver: RCTPromiseResolveBlock
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private let rejecter: RCTPromiseRejectBlock
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}
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/**
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* Wrap a block with an automatic promise resolver and rejecter.
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*
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* The value returned by the `block` must be serializable by the React Native bridge, or `nil`.
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* The error thrown by the `block` should be a `CameraError`
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*/
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func withPromise(_ promise: Promise, _ block: () throws -> Any?) {
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do {
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let result = try block()
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promise.resolve(result)
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} catch let error as CameraError {
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promise.reject(error: error)
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} catch let error as NSError {
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promise.reject(error: CameraError.unknown(message: error.description), cause: error)
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}
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}
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/**
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* Wrap a block with an automatic promise resolver and rejecter.
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*
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* The value returned by the `block` must be serializable by the React Native bridge, or `nil`.
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* The error thrown by the `block` should be a `CameraError`
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*/
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func withPromise(resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock, _ block: () throws -> Any?) {
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return withPromise(Promise(resolver: resolve, rejecter: reject), block)
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}
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