我有一个与物理设备通信的应用程序,每个应用程序都提供自己的通信URL。
class Device {
let commsUrl: URL
let serialNo: String
}
对于与这些设备相关的所有请求,我有一个共同的Alamofire SessionManager
(在我自己的框架中)。正在向Alamofire RequestAdapter子类提供请求:
class DeviceRequestAdapter: RequestAdapter {
func adapt(_ urlRequest: URLRequest) throws -> URLRequest {
var urlRequestModified = URLRequest(url: device.commsUrl)
// set headers etc...
return urlRequestModified
}
}
不幸的是,当我查看Charles日志时,Alamofire同时发送了两个请求,一个是原始URL,另一个是修改过的URL(和修改后的头文件)。如何解决这个问题?我是否需要为每个设备创建一个新的SessionManager?
编辑:创建请求的代码:
func request(device: Device, command: Device.Command) -> URLRequest? {
let rawRequest = DeviceCommandRequest(command: command, url: device.commsUrl) //sets appropriate endpoint and JSON content
guard let dataRequest = try? rawRequest.dataRequest(), //dataRequest() is a convenience function to create a request using SessionManager
let urlRequest = dataRequest.request
else {
return nil
}
let adapter = DeviceRequestAdapter(device: device)
return try? adapter.adapt(urlRequest)
}
适配器:
class DeviceRequestAdapter: RequestAdapter {
private func adaptURL() -> URL? {
// return modified URL based on Device url and serialNo
}
func adapt(_ urlRequest: URLRequest) throws -> URLRequest {
guard let body = urlRequest.httpBody, let url = adaptURL() else {
return urlRequest
}
var newRequest = URLRequest(url: url)
newRequest.setValue("something", forHTTPHeaderField: "headerField") //and other modifications
return newRequest
}
}
最后,我重构了代码,以便每个设备都有自己的会话管理器。显然,您无法使用RequestAdapter
更改请求的URL。