命令行应用程序的 Swift 异步方法调用

发布于 2025-01-10 14:41:45 字数 783 浏览 0 评论 0原文

我正在尝试在简单的 Swift 命令行工具中重用一些在 SwiftUI 应用程序中运行良好的异步标记代码。为了简单起见，我们假设我想

func fetchData(base : String) async throws -> SomeDate
    {
        let request = createURLRequest(forBase: base)
        
        let (data, response) = try await URLSession.shared.data(for: request)
        guard (response as? HTTPURLResponse)?.statusCode == 200 else {
            throw FetchError.urlResponse
        }
        let returnData = try! JSONDecoder().decode(SomeData.self, from: data)
        
        return returnData
    }

在命令行应用程序中重用一个函数。像我的“main-function”中这样的调用

    let allInfo = try clerk.fetchData("base")

会给出错误消息'async' call in a function that does not support concurrency。处理此案的正确方法是什么。

谢谢帕特里克

原文

I'm trying to reuse some async marked code that works great in a SwiftUI application in a simple Swift-Command line tool.
Lets assume for simplicity that I'd like to reuse a function

func fetchData(base : String) async throws -> SomeDate
    {
        let request = createURLRequest(forBase: base)
        
        let (data, response) = try await URLSession.shared.data(for: request)
        guard (response as? HTTPURLResponse)?.statusCode == 200 else {
            throw FetchError.urlResponse
        }
        let returnData = try! JSONDecoder().decode(SomeData.self, from: data)
        
        return returnData
    }

in my command line application.
A call like

    let allInfo = try clerk.fetchData("base")

in my "main-function" gives the error message 'async' call in a function that does not support concurrency.
What is the correct way to handle this case.

Thanks
Patrick

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我家小可爱 2025-01-17 14:41:45

要调用 async 方法，调用必须在 async 方法内部进行或包装在 Task 中。
此外，该方法必须调用 wirh await

Task {
    do {
        let allInfo = try await clerk.fetchData("base")
    } catch {
        print(error)
    }
}

您可以使用此语法使 CLI 的入口点 async

@main
struct CLI {
    static func main() async throws {

        let args = CommandLine.arguments
        ...
}

结构的名称是任意的。

您需要将文件从 main.swift 重命名为 CLI.swift 以修复错误“main”属性不能在包含顶级的模块中使用代码。

To call an async method the call must take place inside an async method or wrapped in a Task.
Further the method must be called wirh await

Task {
    do {
        let allInfo = try await clerk.fetchData("base")
    } catch {
        print(error)
    }
}

You can make the entry point of the CLI async with this syntax

@main
struct CLI {
    static func main() async throws {

        let args = CommandLine.arguments
        ...
}

The name of the struct is arbitrary.

You need to rename the file from main.swift to CLI.swift to fix the error 'main' attribute cannot be used in a module that contains top-level code.

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