63 lines
1.7 KiB
Swift
63 lines
1.7 KiB
Swift
// Copyright 2021 Tokamak contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#if os(WASI) && compiler(>=5.5) && (canImport(Concurrency) || canImport(_Concurrency))
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import JavaScriptKit
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import TokamakDOM
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private let jsFetch = JSObject.global.fetch.function!
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private func fetch(_ url: String) -> JSPromise {
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JSPromise(jsFetch(url).object!)!
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}
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private struct Response: Decodable {
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let uuid: String
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}
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struct TaskDemo: View {
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@State
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private var response: Result<Response, Error>?
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var body: some View {
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VStack {
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switch response {
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case let .success(response):
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Text("Fetched UUID is \(response.uuid)")
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case let .failure(error):
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Text("Error is \(error)")
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default:
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Text("Response not available yet")
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}
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Button("Fetch new UUID asynchronously") {
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response = nil
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Task { await fetchResponse() }
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}
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}.task {
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await fetchResponse()
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}
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}
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func fetchResponse() async {
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do {
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let fetchResult = try await fetch("https://httpbin.org/uuid").value
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let json = try await JSPromise(fetchResult.json().object!)!.value
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response = Result { try JSValueDecoder().decode(Response.self, from: json) }
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} catch {
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response = .failure(error)
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}
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}
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}
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#endif
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