mirror of
https://github.com/RevenueCat/purchases-ios
synced 2026-11-09 22:35:56 +05:45
Antonio PallaresandCursor
96a3102be3
* refactor: model ForceServerErrorStrategy interception as a single Action enum The two closures (`fakeResponseWithoutPerformingRequest` and `shouldForceServerError`) encoded an implicit precedence rule that only lived in a doc comment. A single closure returning `Action` makes each request resolve to exactly one outcome. Co-authored-by: Cursor <cursoragent@cursor.com> * refactor: log the destination URL and faked status code when forcing errors Both messages previously identified only the request, so a faked 404 and a faked 204 looked identical, and there was no way to tell whether a forced error routed to the 502 endpoint or to an unreachable host. Co-authored-by: Cursor <cursoragent@cursor.com> --------- Co-authored-by: Cursor <cursoragent@cursor.com>
1232 lines
50 KiB
Swift
1232 lines
50 KiB
Swift
//
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// Copyright RevenueCat Inc. All Rights Reserved.
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//
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// Licensed under the MIT License (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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// https://opensource.org/licenses/MIT
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//
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// HTTPClient.swift
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//
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// Created by César de la Vega on 7/22/21.
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import Foundation
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// swiftlint:disable file_length
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class HTTPClient {
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typealias RequestHeaders = HTTPRequest.Headers
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typealias ResponseHeaders = HTTPResponse<HTTPEmptyResponseBody>.Headers
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typealias Completion<Value: HTTPResponseBody> = (VerifiedHTTPResponse<Value>.Result) -> Void
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let systemInfo: SystemInfo
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let timeout: TimeInterval
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let authHeaders: RequestHeaders
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private let session: URLSession
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private let state: Atomic<State> = .init(.initial)
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private let eTagManager: ETagManager
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private let dnsChecker: DNSCheckerType.Type
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private let signing: SigningType
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private let diagnosticsTracker: DiagnosticsTrackerType?
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private let dateProvider: DateProvider
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private let retriableStatusCodes: Set<HTTPStatusCode>
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private let operationDispatcher: OperationDispatcher
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private let requestTimeoutManager: HTTPRequestTimeoutManagerType
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private let apiSourceFailover: APISourceFailoverType?
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private let retryBackoffIntervals: [TimeInterval] = [
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TimeInterval(0),
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TimeInterval(0.75),
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TimeInterval(3)
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]
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/// Defensive cap on API source attempts within one logical request, in case the source list is
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/// re-armed (topic rebuild or interval restart) while a request is walking it.
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private static let maxAPISourceAttempts = 5
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init(systemInfo: SystemInfo,
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eTagManager: ETagManager,
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signing: SigningType,
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diagnosticsTracker: DiagnosticsTrackerType?,
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dnsChecker: DNSCheckerType.Type = DNSChecker.self,
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retriableStatusCodes: Set<HTTPStatusCode> = Set([.tooManyRequests]),
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requestTimeout: TimeInterval = Configuration.networkTimeoutDefault,
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dateProvider: DateProvider = DateProvider(),
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operationDispatcher: OperationDispatcher,
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apiSourceFailover: APISourceFailoverType?,
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timeoutManager: HTTPRequestTimeoutManagerType? = nil
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) {
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let config = URLSessionConfiguration.ephemeral
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config.httpMaximumConnectionsPerHost = 1
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config.timeoutIntervalForRequest = requestTimeout
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config.timeoutIntervalForResource = requestTimeout
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config.urlCache = nil // We implement our own caching with `ETagManager`.
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self.session = URLSession(configuration: config,
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delegate: RedirectLoggerSessionDelegate(),
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delegateQueue: nil)
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self.systemInfo = systemInfo
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self.eTagManager = eTagManager
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self.signing = signing
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self.diagnosticsTracker = diagnosticsTracker
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self.dnsChecker = dnsChecker
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self.retriableStatusCodes = retriableStatusCodes
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self.timeout = requestTimeout
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self.authHeaders = HTTPClient.authorizationHeader(withAPIKey: systemInfo.apiKey)
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self.dateProvider = dateProvider
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self.operationDispatcher = operationDispatcher
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self.apiSourceFailover = apiSourceFailover
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self.requestTimeoutManager = timeoutManager ?? HTTPRequestTimeoutManager(
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defaultTimeout: timeout,
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dateProvider: dateProvider
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)
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}
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/// - Parameter verificationMode: if `nil`, this will default to `SystemInfo.responseVerificationMode`
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func perform<Value: HTTPResponseBody>(
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_ request: HTTPRequest,
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with verificationMode: Signing.ResponseVerificationMode? = nil,
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completionHandler: Completion<Value>?
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) {
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self.perform(request: .init(httpRequest: request,
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authHeaders: self.authHeaders,
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defaultHeaders: self.defaultHeaders,
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verificationMode: verificationMode ?? self.systemInfo.responseVerificationMode,
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internalSettings: self.systemInfo.dangerousSettings.internalSettings,
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completionHandler: completionHandler))
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}
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func clearCaches() {
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self.eTagManager.clearCaches()
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}
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var signatureVerificationEnabled: Bool {
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return self.systemInfo.responseVerificationMode.isEnabled
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}
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// Visible for tests
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var defaultHeaders: RequestHeaders {
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let preferredLocales = self.systemInfo.preferredLocales.prefix(3).map {
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$0.replacingOccurrences(of: "-", with: "_")
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}.joined(separator: ",")
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var headers: RequestHeaders = [
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"content-type": "application/json",
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"X-Version": SystemInfo.frameworkVersion,
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"X-Platform": SystemInfo.platformHeader,
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"X-Platform-Version": SystemInfo.systemVersion,
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"X-Platform-Flavor": self.systemInfo.platformFlavor,
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"X-Platform-Device": SystemInfo.deviceVersion,
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"X-Client-Version": SystemInfo.appVersion,
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"X-Client-Build-Version": SystemInfo.buildVersion,
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"X-Client-Bundle-ID": SystemInfo.bundleIdentifier,
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"X-Preferred-Locales": preferredLocales,
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"X-StoreKit2-Enabled": "\(self.systemInfo.storeKitVersion.isStoreKit2EnabledAndAvailable)",
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"X-StoreKit-Version": "\(self.systemInfo.storeKitVersion.effectiveVersion)",
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"X-Observer-Mode-Enabled": "\(self.systemInfo.observerMode)",
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RequestHeader.retryCount.rawValue: "0",
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RequestHeader.sandbox.rawValue: "\(self.systemInfo.isSandbox)",
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"X-Is-Backgrounded": "\(self.systemInfo.isAppBackgroundedState)",
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"X-Is-Debug-Build": "\(self.systemInfo.isDebugBuild)",
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"X-Installation-Method": SystemInfo.installationMethod
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]
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if let storefront = self.systemInfo.storefront {
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headers["X-Storefront"] = storefront.countryCode
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}
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if let platformFlavorVersion = self.systemInfo.platformFlavorVersion {
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headers["X-Platform-Flavor-Version"] = platformFlavorVersion
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}
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if let idfv = self.systemInfo.identifierForVendor {
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headers["X-Apple-Device-Identifier"] = idfv
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}
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if self.systemInfo.dangerousSettings.customEntitlementComputation {
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headers["X-Custom-Entitlements-Computation"] = "\(true)"
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}
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if self.systemInfo.dangerousSettings.uiPreviewMode {
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headers["X-UI-Preview-Mode"] = "\(true)"
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}
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return headers
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}
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}
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extension HTTPClient {
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static let rcContainerFormatAcceptHeaderValue = "application/x-rc-format"
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static var rcContainerFormatElementEncodingHeaderValue: String {
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return RCContainer.Element.ContentEncoding.requestElementEncodingHeaderValue
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}
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static func authorizationHeader(withAPIKey apiKey: String) -> RequestHeaders {
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return [RequestHeader.authorization.rawValue: "Bearer \(apiKey)"]
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}
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static func nonceHeader(with data: Data) -> RequestHeaders {
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return [RequestHeader.nonce.rawValue: data.base64EncodedString()]
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}
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static func postParametersHeaderForSigning(with body: HTTPRequestBody) -> RequestHeaders {
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if let header = body.postParameterHeader {
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return [RequestHeader.postParameters.rawValue: header]
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} else {
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return [:]
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}
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}
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static func headerParametersForSignatureHeader(
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with headers: RequestHeaders,
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path: HTTPRequestPath
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) -> RequestHeaders {
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if let header = HTTPRequest.headerParametersForSignatureHeader(
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headers: headers,
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path: path
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) {
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return [RequestHeader.headerParametersForSignature.rawValue: header]
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} else {
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return [:]
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}
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}
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enum RequestHeader: String {
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case authorization = "Authorization"
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case accept = "Accept"
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case acceptRCElementEncoding = "Accept-RC-Element-Encoding"
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case nonce = "X-Nonce"
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case eTag = "X-RevenueCat-ETag"
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case lastRefreshTime = "X-RC-Last-Refresh-Time"
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case postParameters = "X-Post-Params-Hash"
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case headerParametersForSignature = "X-Headers-Hash"
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case sandbox = "X-Is-Sandbox"
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case retryCount = "X-Retry-Count"
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}
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enum ResponseHeader: String {
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case eTag = "X-RevenueCat-ETag"
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case location = "Location"
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case signature = "X-Signature"
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case requestDate = "X-RevenueCat-Request-Time"
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case contentType = "Content-Type"
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case isLoadShedder = "X-RevenueCat-Fortress"
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case requestID = "X-Request-ID"
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case amazonTraceID = "X-Amzn-Trace-ID"
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case retryAfter = "Retry-After"
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case isRetryable = "Is-Retryable"
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}
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}
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// @unchecked because:
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// - Class is not `final` (it's mocked). This implicitly makes subclasses `Sendable` even if they're not thread-safe.
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extension HTTPClient: @unchecked Sendable {}
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// MARK: - CDN
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internal extension HTTPClient {
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/// Fetches raw data from an arbitrary URL using the client's configured `URLSession`.
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///
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/// Use this for CDN or other non-RC-API requests where the SDK's path-based request building
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/// is not applicable, but we still want the same session configuration (timeouts, connection limits).
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func fetchRawData(from url: URL, completion: @escaping (Result<Data, Error>) -> Void) {
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self.session.dataTask(with: url) { data, response, error in
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if let error = error {
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completion(.failure(error))
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} else if let httpResponse = response as? HTTPURLResponse,
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!(200..<300).contains(httpResponse.statusCode) {
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completion(.failure(URLError(.badServerResponse)))
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} else if let data = data {
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completion(.success(data))
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} else {
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completion(.failure(URLError(.unknown)))
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}
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}.resume()
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}
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}
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// MARK: - Private
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internal extension HTTPClient {
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struct State {
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var queuedRequests: [Request]
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var currentSerialRequest: Request?
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static let initial: Self = .init(queuedRequests: [], currentSerialRequest: nil)
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}
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/// The API-source resolution state of a request, modeled as one value so an inconsistent
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/// combination (e.g. a targeted source without an attempt count) is unrepresentable.
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enum APISourceState {
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/// Source resolution hasn't run yet for this logical request.
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case unresolved
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/// Resolution ran and API sources don't apply (setting disabled, proxy or overridden
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/// base URL, endpoint fallback attempt, opted-out path, or an exhausted source list).
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case noSource
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/// The request targets `source`; `attemptCount` is the number of source attempts made
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/// by this logical request so far (1 when a source is first resolved, +1 per failover).
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case source(APISourceFailover.ResolvedSource, attemptCount: Int)
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var source: APISourceFailover.ResolvedSource? {
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guard case let .source(source, _) = self else { return nil }
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return source
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}
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}
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struct Request: CustomStringConvertible {
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var httpRequest: HTTPRequest
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var headers: HTTPClient.RequestHeaders
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var verificationMode: Signing.ResponseVerificationMode
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var completionHandler: HTTPClient.Completion<Data>?
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private(set) var fallbackUrlIndex: Int?
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/// Whether the request has been retried.
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var retried: Bool {
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return self.retryCount > 0
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}
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/// The number of times that we have retried the request
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var retryCount: UInt = 0
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/// Whether the request is being made to a fallback URL.
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var isFallbackURLRequest: Bool {
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return self.fallbackUrlIndex != nil
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}
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/// Carried on the request so a failure can report the exact handle unhealthy, and so
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/// retries of any kind (ETag refresh, status-code backoff) keep targeting the same host.
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private(set) var apiSourceState: APISourceState = .unresolved
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init<Value: HTTPResponseBody>(httpRequest: HTTPRequest,
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authHeaders: HTTPClient.RequestHeaders,
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defaultHeaders: HTTPClient.RequestHeaders,
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verificationMode: Signing.ResponseVerificationMode,
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internalSettings: InternalDangerousSettingsType,
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completionHandler: HTTPClient.Completion<Value>?) {
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self.httpRequest = httpRequest.requestAddingNonceIfRequired(with: verificationMode)
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self.headers = self.httpRequest.headers(
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with: authHeaders,
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defaultHeaders: defaultHeaders,
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verificationMode: verificationMode,
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internalSettings: internalSettings
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)
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self.verificationMode = verificationMode
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if let completionHandler = completionHandler {
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self.completionHandler = { result in
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completionHandler(result.parseResponse())
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}
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} else {
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self.completionHandler = nil
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}
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}
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var method: HTTPRequest.Method { self.httpRequest.method }
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var path: String { self.httpRequest.path.relativePath }
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func getCurrentRequestURL(proxyURL: URL?, apiSourceURL: URL?) -> URL? {
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return self.httpRequest.path.url(
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proxyURL: proxyURL,
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apiSourceURL: apiSourceURL,
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fallbackUrlIndex: self.fallbackUrlIndex
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)
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}
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func retriedRequest() -> Self {
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var copy = self
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copy.retryCount += 1
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copy.headers[RequestHeader.retryCount.rawValue] = "\(copy.retryCount)"
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return copy
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}
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/// Resolves the API source once per logical request. Retries of any kind keep the carried
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/// source instead of re-resolving, so they deterministically target the same host.
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mutating func resolveAPISourceIfNeeded(with failover: APISourceFailoverType?) {
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guard case .unresolved = self.apiSourceState else { return }
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if let source = failover?.currentSource(for: self.httpRequest.path,
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isFallbackAttempt: self.isFallbackURLRequest) {
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self.apiSourceState = .source(source, attemptCount: 1)
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} else {
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self.apiSourceState = .noSource
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}
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}
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/// Only meaningful on a request that is already targeting a source (a failover decision can
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/// only come from one); the previous attempt count carries over and increments.
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func requestWith(nextAPISource: APISourceFailover.ResolvedSource) -> Self {
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guard case let .source(_, attemptCount) = self.apiSourceState else {
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assertionFailure("Retrying on a next API source requires a current one")
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return self
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}
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var copy = self
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copy.apiSourceState = .source(nextAPISource, attemptCount: attemptCount + 1)
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return copy
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}
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func requestWithNextFallbackHost(proxyURL: URL?) -> Self? {
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guard proxyURL == nil else {
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// Don't fallback to next host if proxyURL is set
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return nil
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}
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var copy = self
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copy.fallbackUrlIndex = self.fallbackUrlIndex?.advanced(by: 1) ?? 0
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// The static fallback walk drops the API source: fallback attempts pin their own host and
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// must not re-enter source failover.
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copy.apiSourceState = .noSource
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guard copy.getCurrentRequestURL(proxyURL: nil, apiSourceURL: nil) != nil else {
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// No more fallback hosts available
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return nil
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}
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return copy
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}
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var description: String {
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"""
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<\(type(of: self)): httpMethod=\(self.method.httpMethod)
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path=\(self.path)
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headers=\(self.headers.description)
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retried=\(self.retried)
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>
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"""
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}
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}
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}
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private extension HTTPClient {
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static let serverErrorResponse: ErrorResponse = .init(code: .internalServerError,
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originalCode: BackendErrorCode.unknownBackendError.rawValue)
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func perform(request: Request) {
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if !request.retried {
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let requestEnqueued: Bool = self.state.modify {
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if $0.currentSerialRequest != nil {
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Logger.debug(Strings.network.serial_request_queued(httpMethod: request.method.httpMethod,
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path: request.path,
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queuedRequestsCount: $0.queuedRequests.count))
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$0.queuedRequests.append(request)
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return true
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} else {
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Logger.debug(Strings.network.starting_request(httpMethod: request.method.httpMethod,
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path: request.path))
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$0.currentSerialRequest = request
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return false
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}
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}
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guard !requestEnqueued else { return }
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}
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self.start(request: request)
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}
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/// - Returns: `nil` if the request must be retried
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// swiftlint:disable:next function_parameter_count
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func parse(urlResponse: URLResponse?,
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request: Request,
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urlRequest: URLRequest,
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data: Data?,
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error networkError: Error?,
|
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requestStartTime: Date) -> VerifiedHTTPResponse<Data>.Result? {
|
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if let networkError = networkError {
|
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return .failure(NetworkError(networkError, dnsChecker: self.dnsChecker))
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}
|
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|
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guard let httpURLResponse = urlResponse as? HTTPURLResponse else {
|
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return .failure(.unexpectedResponse(urlResponse))
|
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}
|
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|
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let statusCode: HTTPStatusCode = .init(rawValue: httpURLResponse.statusCode)
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|
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let dataIfAvailable = Self.responseBodyData(statusCode: statusCode, data: data)
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|
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return self.createVerifiedResponse(request: request,
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urlRequest: urlRequest,
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data: dataIfAvailable,
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response: httpURLResponse,
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requestStartTime: requestStartTime)
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}
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|
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/// - Returns `Result<VerifiedHTTPResponse<Data>, NetworkError>?`
|
|
// swiftlint:disable:next function_body_length
|
|
private func createVerifiedResponse(
|
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request: Request,
|
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urlRequest: URLRequest,
|
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data: Data?,
|
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response httpURLResponse: HTTPURLResponse,
|
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requestStartTime: Date
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) -> VerifiedHTTPResponse<Data>.Result? {
|
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#if DEBUG
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let requestHeaders: HTTPClient.RequestHeaders
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|
|
if self.systemInfo.dangerousSettings.internalSettings.disableHeaderSignatureVerification {
|
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Logger.warn(Strings.network.api_request_disabling_header_parameter_signature_verification(
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request.httpRequest
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))
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requestHeaders = [:]
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} else {
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requestHeaders = request.headers
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}
|
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#else
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let requestHeaders = request.headers
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#endif
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|
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let result = Result
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.success(data)
|
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.mapToResponse(response: httpURLResponse, request: request.httpRequest)
|
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// Verify response
|
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.map { cachedResponse -> VerifiedHTTPResponse<Data?> in
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let isLoadShedderResponse = httpURLResponse.isLoadShedder
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let isFallbackUrlResponse = request.isFallbackURLRequest
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|
#if DEBUG
|
|
if isFallbackUrlResponse && isLoadShedderResponse {
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|
Logger.warn(
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Strings.network.api_request_response_both_fallback_and_load_shedder(request.httpRequest)
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)
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}
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#endif
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return cachedResponse.verify(
|
|
signing: self.signing(for: request.httpRequest),
|
|
request: request.httpRequest,
|
|
requestHeaders: requestHeaders,
|
|
publicKey: request.verificationMode.publicKey,
|
|
isLoadShedderResponse: isLoadShedderResponse,
|
|
isFallbackUrlResponse: isFallbackUrlResponse
|
|
)
|
|
}
|
|
// Fetch from ETagManager if available
|
|
.map { (response) -> VerifiedHTTPResponse<Data>? in
|
|
guard request.httpRequest.path.shouldSendEtag else {
|
|
return response.asOptionalResponse
|
|
}
|
|
|
|
return self.eTagManager.httpResultFromCacheOrBackend(
|
|
with: response,
|
|
request: urlRequest,
|
|
retried: request.retried,
|
|
isFallbackURLRequest: request.isFallbackURLRequest
|
|
)
|
|
}
|
|
// Upgrade to error in enforced mode
|
|
.flatMap { response -> Result<VerifiedHTTPResponse<Data>?, NetworkError> in
|
|
if let response = response, response.verificationResult == .failed {
|
|
if case .enforced = request.verificationMode {
|
|
return .failure(.signatureVerificationFailed(path: request.httpRequest.path,
|
|
code: response.httpStatusCode))
|
|
} else {
|
|
// Any other mode gets forwarded as a success, but we log the error
|
|
Logger.error(Strings.signing.request_failed_verification(request.httpRequest))
|
|
return .success(response)
|
|
}
|
|
} else {
|
|
return .success(response)
|
|
}
|
|
}
|
|
.asOptionalResult?
|
|
.convertUnsuccessfulResponseToError()
|
|
|
|
return result
|
|
}
|
|
|
|
// swiftlint:disable:next function_parameter_count function_body_length
|
|
func handle(urlResponse: URLResponse?,
|
|
request: Request,
|
|
urlRequest: URLRequest,
|
|
data: Data?,
|
|
error networkError: Error?,
|
|
requestStartTime: Date) {
|
|
RCTestAssertNotMainThread()
|
|
|
|
let response = self.parse(urlResponse: urlResponse,
|
|
request: request,
|
|
urlRequest: urlRequest,
|
|
data: data,
|
|
error: networkError,
|
|
requestStartTime: requestStartTime)
|
|
|
|
var requestTimeoutResult: HTTPRequestTimeoutManager.RequestResult = .other
|
|
|
|
if let response = response {
|
|
let httpURLResponse = urlResponse as? HTTPURLResponse
|
|
|
|
switch response {
|
|
case let .success(response):
|
|
Logger.debug(Strings.network.api_request_completed(
|
|
request.httpRequest,
|
|
// Getting status code from the original response to detect 304s
|
|
// If that can't be extracted, get status code from the parsed response.
|
|
httpCode: httpURLResponse?.httpStatusCode ?? response.httpStatusCode,
|
|
metadata: Logger.verboseLogsEnabled ? response.metadata : nil
|
|
))
|
|
|
|
if response.isLoadShedder {
|
|
Logger.debug(Strings.network.request_handled_by_load_shedder(request.httpRequest.path))
|
|
}
|
|
|
|
// Record successful response from the main backend
|
|
if !request.isFallbackURLRequest {
|
|
requestTimeoutResult = .successOnMainBackend
|
|
}
|
|
|
|
self.finish(request: request,
|
|
response: .success(response),
|
|
retryScheduled: false,
|
|
requestTimeoutResult: requestTimeoutResult,
|
|
urlRequest: urlRequest,
|
|
requestStartTime: requestStartTime)
|
|
|
|
case let .failure(error):
|
|
Logger.debug(Strings.network.api_request_failed(request.httpRequest,
|
|
httpCode: httpURLResponse?.httpStatusCode,
|
|
error: error,
|
|
metadata: httpURLResponse?.metadata))
|
|
|
|
if httpURLResponse?.isLoadShedder == true {
|
|
Logger.debug(Strings.network.request_handled_by_load_shedder(request.httpRequest.path))
|
|
}
|
|
|
|
// A timeout on a main backend URL for a request that has a fallback URL
|
|
if let error = networkError as? URLError, case .timedOut = error.code,
|
|
!request.isFallbackURLRequest,
|
|
request.httpRequest.path.supportsFallbackURLs {
|
|
requestTimeoutResult = .timeoutOnMainBackendForFallbackSupportedEndpoint
|
|
}
|
|
|
|
// A failure that points at the host (never a device-connectivity error or a 4xx) on a
|
|
// request targeting an API source may fail over to the next source, but only after the
|
|
// current source's health check fails. The decision is asynchronous: the serial pipeline
|
|
// stays stalled (as if the request were still in flight) until it completes.
|
|
if case let .source(source, attemptCount) = request.apiSourceState,
|
|
attemptCount < Self.maxAPISourceAttempts,
|
|
error.isAllowedToRetryWithFallbackHost,
|
|
let apiSourceFailover = self.apiSourceFailover {
|
|
let requestTimeoutResult = requestTimeoutResult
|
|
apiSourceFailover.onRequestFailure(source) { decision in
|
|
let retryScheduled = self.handleAPISourceFailureDecision(decision,
|
|
request: request,
|
|
error: error,
|
|
httpURLResponse: httpURLResponse)
|
|
self.finish(request: request,
|
|
response: .failure(error),
|
|
retryScheduled: retryScheduled,
|
|
requestTimeoutResult: requestTimeoutResult,
|
|
urlRequest: urlRequest,
|
|
requestStartTime: requestStartTime)
|
|
}
|
|
return
|
|
}
|
|
|
|
var retryScheduled = self.retryRequestWithNextFallbackHostIfNeeded(request: request,
|
|
error: error)
|
|
|
|
if !retryScheduled {
|
|
retryScheduled = self.retryRequestIfNeeded(request: request,
|
|
httpURLResponse: httpURLResponse)
|
|
}
|
|
|
|
self.finish(request: request,
|
|
response: .failure(error),
|
|
retryScheduled: retryScheduled,
|
|
requestTimeoutResult: requestTimeoutResult,
|
|
urlRequest: urlRequest,
|
|
requestStartTime: requestStartTime)
|
|
}
|
|
} else {
|
|
Logger.debug(Strings.network.retrying_request(httpMethod: request.method.httpMethod, path: request.path))
|
|
|
|
self.state.modify {
|
|
$0.queuedRequests.insert(request.retriedRequest(), at: 0)
|
|
}
|
|
|
|
self.finish(request: request,
|
|
response: nil,
|
|
retryScheduled: true,
|
|
requestTimeoutResult: requestTimeoutResult,
|
|
urlRequest: urlRequest,
|
|
requestStartTime: requestStartTime)
|
|
}
|
|
}
|
|
|
|
/// Schedules the retry (if any) that a failover `decision` calls for, returning whether one was
|
|
/// scheduled. A source that failed its health check is retried on the next source; otherwise the
|
|
/// pre-existing chain runs: the static fallback host walk, then the status-code backoff retry.
|
|
private func handleAPISourceFailureDecision(_ decision: APISourceFailover.FailureDecision,
|
|
request: Request,
|
|
error: NetworkError,
|
|
httpURLResponse: HTTPURLResponse?) -> Bool {
|
|
switch decision {
|
|
case let .retryNextSource(nextSource):
|
|
Logger.debug(Strings.network.retrying_request_with_next_api_source(
|
|
httpMethod: request.method.httpMethod,
|
|
path: request.path,
|
|
host: nextSource.handle.url
|
|
))
|
|
self.state.modify {
|
|
$0.queuedRequests.insert(request.requestWith(nextAPISource: nextSource), at: 0)
|
|
}
|
|
return true
|
|
|
|
case .sourceHealthy, .sourcesExhausted:
|
|
// Declining to switch sources doesn't disable the pre-existing static fallback: the
|
|
// request still failed, so endpoints with fallback hosts keep retrying there as before.
|
|
return self.retryRequestWithNextFallbackHostIfNeeded(request: request, error: error)
|
|
|| self.retryRequestIfNeeded(request: request, httpURLResponse: httpURLResponse)
|
|
}
|
|
}
|
|
|
|
/// The shared tail of `handle(...)`: completes the request (unless a retry was scheduled), records
|
|
/// timeout bookkeeping and diagnostics for the attempt, and unblocks the serial pipeline.
|
|
// swiftlint:disable:next function_parameter_count
|
|
private func finish(request: Request,
|
|
response: VerifiedHTTPResponse<Data>.Result?,
|
|
retryScheduled: Bool,
|
|
requestTimeoutResult: HTTPRequestTimeoutManager.RequestResult,
|
|
urlRequest: URLRequest,
|
|
requestStartTime: Date) {
|
|
if !retryScheduled, let response = response {
|
|
request.completionHandler?(response)
|
|
}
|
|
|
|
self.requestTimeoutManager.recordRequestResult(requestTimeoutResult)
|
|
|
|
self.trackHttpRequestPerformedIfNeeded(request: request,
|
|
host: urlRequest.url?.host,
|
|
requestStartTime: requestStartTime,
|
|
result: response)
|
|
|
|
self.beginNextRequest()
|
|
}
|
|
|
|
func beginNextRequest() {
|
|
let nextRequest: Request? = self.state.modify {
|
|
Logger.debug(Strings.network.serial_request_done(httpMethod: $0.currentSerialRequest?.method.httpMethod,
|
|
path: $0.currentSerialRequest?.path,
|
|
queuedRequestsCount: $0.queuedRequests.count))
|
|
$0.currentSerialRequest = $0.queuedRequests.popFirst()
|
|
|
|
return $0.currentSerialRequest
|
|
}
|
|
|
|
if let nextRequest = nextRequest {
|
|
Logger.debug(Strings.network.starting_next_request(request: nextRequest.description))
|
|
self.start(request: nextRequest)
|
|
}
|
|
}
|
|
|
|
func start(request: Request) {
|
|
var request = request
|
|
request.resolveAPISourceIfNeeded(with: self.apiSourceFailover)
|
|
|
|
let urlRequest = self.convert(request: request)
|
|
|
|
guard let urlRequest = urlRequest else {
|
|
let error: NetworkError = .unableToCreateRequest(request.httpRequest.path)
|
|
|
|
Logger.error(error.description)
|
|
request.completionHandler?(.failure(error))
|
|
return
|
|
}
|
|
|
|
Logger.debug(Strings.network.api_request_started(request.httpRequest))
|
|
|
|
var finalURLRequest = urlRequest
|
|
|
|
let requestStartTime = self.dateProvider.now()
|
|
|
|
#if DEBUG
|
|
// Meant only for testing error handling behavior of the SDK.
|
|
if let forceErrorStrategy = self.systemInfo.dangerousSettings.internalSettings.forceServerErrorStrategy {
|
|
switch forceErrorStrategy.action(request) {
|
|
case let .fakeResponse(fakeResponse, fakeData):
|
|
// `FB13133387`: when computing offline CustomerInfo, `StoreKit.Transaction.unfinished`
|
|
// might be empty if called immediately after `Product.purchase()`.
|
|
// This introduces a delay to simulate a real API request, and avoid that race condition.
|
|
|
|
Logger.warn(Strings.network.api_request_faking_response(request.httpRequest,
|
|
statusCode: fakeResponse.statusCode))
|
|
DispatchQueue.global().asyncAfter(deadline: .now() + .milliseconds(300)) {
|
|
self.handle(urlResponse: fakeResponse,
|
|
request: request,
|
|
urlRequest: urlRequest,
|
|
data: fakeData,
|
|
error: nil,
|
|
requestStartTime: requestStartTime)
|
|
}
|
|
return
|
|
|
|
case let .serverErrorURL(serverErrorURL):
|
|
Logger.warn(Strings.network.api_request_forcing_server_error(request.httpRequest,
|
|
serverErrorURL: serverErrorURL))
|
|
finalURLRequest = URLRequest(url: serverErrorURL)
|
|
|
|
case .performRequest:
|
|
break
|
|
}
|
|
}
|
|
#endif
|
|
|
|
finalURLRequest.timeoutInterval = requestTimeoutManager.timeout(
|
|
isFallback: request.isFallbackURLRequest,
|
|
fallbackAvailable: request.httpRequest.path.supportsFallbackURLs && SystemInfo.proxyURL == nil
|
|
)
|
|
|
|
// swiftlint:disable:next redundant_void_return
|
|
let task = self.session.dataTask(with: finalURLRequest) { (data, urlResponse, error) -> Void in
|
|
self.handle(urlResponse: urlResponse,
|
|
request: request,
|
|
urlRequest: urlRequest,
|
|
data: data,
|
|
error: error,
|
|
requestStartTime: requestStartTime)
|
|
}
|
|
task.resume()
|
|
}
|
|
|
|
func convert(request: Request) -> URLRequest? {
|
|
guard let requestURL = request.getCurrentRequestURL(
|
|
proxyURL: SystemInfo.proxyURL,
|
|
apiSourceURL: request.apiSourceState.source?.url
|
|
) else {
|
|
return nil
|
|
}
|
|
var urlRequest = URLRequest(url: requestURL)
|
|
urlRequest.httpMethod = request.method.httpMethod
|
|
urlRequest.allHTTPHeaderFields = self.headers(for: request, urlRequest: urlRequest)
|
|
|
|
do {
|
|
urlRequest.httpBody = try request.httpRequest.requestBody?.jsonEncodedData
|
|
} catch {
|
|
Logger.error(Strings.network.creating_json_error(error: error.localizedDescription))
|
|
return nil
|
|
}
|
|
|
|
return urlRequest
|
|
}
|
|
|
|
private func headers(for request: Request, urlRequest: URLRequest) -> HTTPClient.RequestHeaders {
|
|
if request.httpRequest.path.shouldSendEtag {
|
|
let eTagHeader = self.eTagManager.eTagHeader(
|
|
for: urlRequest,
|
|
withSignatureVerification: request.verificationMode.isEnabled,
|
|
refreshETag: request.retried
|
|
)
|
|
return request.headers.merging(eTagHeader)
|
|
} else {
|
|
return request.headers
|
|
}
|
|
}
|
|
|
|
private func signing(for request: HTTPRequest) -> SigningType {
|
|
#if DEBUG
|
|
if self.systemInfo.dangerousSettings.internalSettings.forceSignatureFailures {
|
|
Logger.warn(Strings.network.api_request_forcing_signature_failure(request))
|
|
return FakeSigning.default
|
|
}
|
|
#endif
|
|
|
|
return self.signing
|
|
}
|
|
|
|
private func trackHttpRequestPerformedIfNeeded(request: Request,
|
|
host: String?,
|
|
requestStartTime: Date,
|
|
result: Result<VerifiedHTTPResponse<Data>, NetworkError>?) {
|
|
if #available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) {
|
|
guard let diagnosticsTracker = self.diagnosticsTracker, let result else { return }
|
|
let responseTime = self.dateProvider.now().timeIntervalSince(requestStartTime)
|
|
let requestPathName = request.httpRequest.path.name
|
|
switch result {
|
|
case let .success(response):
|
|
let httpStatusCode = response.httpStatusCode.rawValue
|
|
let verificationResult = response.verificationResult
|
|
diagnosticsTracker.trackHttpRequestPerformed(endpointName: requestPathName,
|
|
host: host,
|
|
responseTime: responseTime,
|
|
wasSuccessful: true,
|
|
responseCode: httpStatusCode,
|
|
backendErrorCode: nil,
|
|
resultOrigin: response.origin,
|
|
verificationResult: verificationResult,
|
|
isRetry: request.retried,
|
|
connectionErrorReason: nil)
|
|
case let .failure(error):
|
|
var responseCode = -1
|
|
var backendErrorCode: Int?
|
|
if case let .errorResponse(errorResponse, code, _) = error {
|
|
responseCode = code.rawValue
|
|
backendErrorCode = errorResponse.code.rawValue
|
|
}
|
|
diagnosticsTracker.trackHttpRequestPerformed(endpointName: requestPathName,
|
|
host: host,
|
|
responseTime: responseTime,
|
|
wasSuccessful: false,
|
|
responseCode: responseCode,
|
|
backendErrorCode: backendErrorCode,
|
|
resultOrigin: nil,
|
|
verificationResult: .notRequested,
|
|
isRetry: request.retried,
|
|
connectionErrorReason: .init(from: error))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// MARK: - Request Retry Logic
|
|
extension HTTPClient {
|
|
|
|
/// Evaluates whether a request should be retried with the next host in the list of fallback hosts.
|
|
///
|
|
/// This function checks the HTTP response status code to determine if the request should be retried
|
|
/// with the next fallback hosts. If the retry conditions are met, it schedules the request immediately and
|
|
/// returns `true` to indicate that the request was retried.
|
|
///
|
|
/// - Parameters:
|
|
/// - request: The original `HTTPClient.Request` that may need to be retried.
|
|
/// - error: The `HTTPClient.NetworkError` that was received.
|
|
/// - Returns: A Boolean value indicating whether the request was retried.
|
|
internal func retryRequestWithNextFallbackHostIfNeeded(
|
|
request: HTTPClient.Request,
|
|
error: NetworkError
|
|
) -> Bool {
|
|
|
|
// The request must be able to be retried with a fallback host
|
|
guard error.isAllowedToRetryWithFallbackHost,
|
|
let nextRequest = request.requestWithNextFallbackHost(proxyURL: SystemInfo.proxyURL) else {
|
|
return false
|
|
}
|
|
|
|
Logger.debug(Strings.network.retrying_request_with_fallback_path(
|
|
httpMethod: nextRequest.method.httpMethod,
|
|
path: nextRequest.path
|
|
))
|
|
self.state.modify {
|
|
$0.queuedRequests.insert(nextRequest, at: 0)
|
|
}
|
|
return true
|
|
}
|
|
|
|
/// Evaluates whether a request should be retried and schedules a retry if necessary.
|
|
///
|
|
/// This function checks the HTTP response status code to determine if the request should be retried.
|
|
/// If the retry conditions are met, it schedules the request to be retried after a backoff interval.
|
|
///
|
|
/// - Parameters:
|
|
/// - request: The original `HTTPClient.Request` that may need to be retried.
|
|
/// - httpURLResponse: An optional `HTTPURLResponse` that contains the status code of the response.
|
|
/// - Returns: A Boolean value indicating whether the request was scheduled for a retry.
|
|
internal func retryRequestIfNeeded(
|
|
request: HTTPClient.Request,
|
|
httpURLResponse: HTTPURLResponse?
|
|
) -> Bool {
|
|
|
|
guard request.httpRequest.isRetryable,
|
|
let httpURLResponse = httpURLResponse,
|
|
isResponseRetryable(httpURLResponse) else { return false }
|
|
|
|
// At this point, retryCount hasn't been incremented yet, so we'll need to do it early here
|
|
// to determine if another retry is appropriate.
|
|
let nextRetryCount = request.retryCount + 1
|
|
|
|
guard nextRetryCount <= self.retryBackoffIntervals.count else {
|
|
Logger.error(
|
|
NetworkStrings.api_request_failed_all_retries(
|
|
httpMethod: request.method.httpMethod,
|
|
path: request.path,
|
|
retryCount: request.retryCount
|
|
)
|
|
)
|
|
return false
|
|
}
|
|
|
|
let retryBackoffInterval: TimeInterval = calculateRetryBackoffTime(
|
|
forResponse: httpURLResponse,
|
|
retryCount: nextRetryCount
|
|
)
|
|
|
|
Logger.debug(
|
|
NetworkStrings.api_request_queued_for_retry(
|
|
httpMethod: request.method.httpMethod,
|
|
retryNumber: nextRetryCount,
|
|
path: request.path,
|
|
backoffInterval: retryBackoffInterval
|
|
)
|
|
)
|
|
self.operationDispatcher.dispatchOnWorkerThread(after: retryBackoffInterval) {
|
|
let retriedRequest = request.retriedRequest()
|
|
self.state.modify {
|
|
$0.queuedRequests.insert(retriedRequest, at: 0)
|
|
}
|
|
self.beginNextRequest()
|
|
}
|
|
return true
|
|
}
|
|
|
|
internal func isResponseRetryable(_ urlResponse: HTTPURLResponse) -> Bool {
|
|
let isStatusCodeRetryable = self.retriableStatusCodes.contains(urlResponse.httpStatusCode)
|
|
let doesServerAllowRetryString = urlResponse.value(forHTTPHeaderField: ResponseHeader.isRetryable.rawValue)
|
|
let doesServerAllowRetry: Bool
|
|
if let doesServerAllowRetryString = doesServerAllowRetryString {
|
|
doesServerAllowRetry = Bool(doesServerAllowRetryString.lowercased()) ?? true
|
|
} else {
|
|
doesServerAllowRetry = true
|
|
}
|
|
|
|
return isStatusCodeRetryable && doesServerAllowRetry
|
|
}
|
|
|
|
internal func calculateRetryBackoffTime(
|
|
forResponse httpURLResponse: HTTPURLResponse,
|
|
retryCount: UInt
|
|
) -> TimeInterval {
|
|
// Use the retry after value from the backend if present
|
|
if let retryAfterHeaderValue = httpURLResponse.allHeaderFields[ResponseHeader.retryAfter.rawValue] as? String,
|
|
let retryAfterSeconds = Double(retryAfterHeaderValue) {
|
|
|
|
// Ensure that the retry interval is not negative or greater than 1 hour
|
|
let nonNegativeRetryAfterSeconds = max(0, retryAfterSeconds)
|
|
let cappedRetryInterval = min(
|
|
nonNegativeRetryAfterSeconds,
|
|
3_600 // 1 hour in seconds
|
|
)
|
|
|
|
return TimeInterval(cappedRetryInterval)
|
|
}
|
|
|
|
// Otherwise, use a default value
|
|
let backoffIntervalIndex = Int(max(retryCount - 1, 0))
|
|
let backoffIntervalIndexIsWithinBounds = backoffIntervalIndex < self.retryBackoffIntervals.count
|
|
return backoffIntervalIndexIsWithinBounds ? self.retryBackoffIntervals[backoffIntervalIndex] : 0
|
|
}
|
|
}
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|
// MARK: - Extensions
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|
|
|
extension HTTPClient {
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|
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|
/// Information from a response to help identify a request.
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|
struct ResponseMetadata {
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var requestID: String?
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|
var amazonTraceID: String?
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|
}
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|
|
|
}
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|
|
|
extension HTTPRequest {
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|
|
|
func requestAddingNonceIfRequired(
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|
with verificationMode: Signing.ResponseVerificationMode
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|
) -> HTTPRequest {
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|
var result = self
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|
|
|
if result.nonce == nil,
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|
result.path.needsNonceForSigning,
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|
verificationMode.isEnabled {
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|
result.addRandomNonce()
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|
}
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|
|
|
return result
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|
}
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|
|
|
func headers(
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|
with authHeaders: HTTPClient.RequestHeaders,
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|
defaultHeaders: HTTPClient.RequestHeaders,
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|
verificationMode: Signing.ResponseVerificationMode,
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|
internalSettings: InternalDangerousSettingsType
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|
) -> HTTPClient.RequestHeaders {
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|
var result: HTTPClient.RequestHeaders = defaultHeaders
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|
result += self.path.additionalHeaders
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|
result += self.additionalHeaders
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|
|
|
if self.path.authenticated {
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|
result += authHeaders
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|
}
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|
|
|
if let nonce = self.nonce {
|
|
result += HTTPClient.nonceHeader(with: nonce)
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|
}
|
|
|
|
if verificationMode.isEnabled,
|
|
self.path.supportsSignatureVerification {
|
|
let headerParametersSignature = HTTPClient.headerParametersForSignatureHeader(
|
|
with: result,
|
|
path: self.path
|
|
)
|
|
|
|
#if DEBUG
|
|
if !internalSettings.disableHeaderSignatureVerification {
|
|
result += headerParametersSignature
|
|
}
|
|
#else
|
|
result += headerParametersSignature
|
|
#endif
|
|
|
|
if let body = self.requestBody {
|
|
result += HTTPClient.postParametersHeaderForSigning(with: body)
|
|
}
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
/// Add a nonce to the request
|
|
private mutating func addRandomNonce() {
|
|
self.nonce = Data.randomNonce()
|
|
}
|
|
|
|
}
|
|
|
|
private extension NetworkError {
|
|
|
|
/// Creates a `NetworkError` from any request `Error`.
|
|
init(_ error: Error, dnsChecker: DNSCheckerType.Type) {
|
|
if let blockedError = dnsChecker.errorWithBlockedHostFromError(error) {
|
|
Logger.error(blockedError.description)
|
|
self = blockedError
|
|
} else {
|
|
self = .networkError(error as NSError)
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
extension HTTPClient {
|
|
|
|
static func responseBodyData(statusCode: HTTPStatusCode, data: Data?) -> Data? {
|
|
switch statusCode {
|
|
case .notModified:
|
|
// `nil` if status code is 304, since the response will be empty and fetched from the eTag.
|
|
return nil
|
|
case .noContent:
|
|
return data ?? Data()
|
|
default:
|
|
return data
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
extension Result where Success == Data?, Failure == NetworkError {
|
|
|
|
/// Converts a `Result<Data?, NetworkError>` into `Result<HTTPResponse<Data?>, NetworkError>`
|
|
func mapToResponse(
|
|
response: HTTPURLResponse,
|
|
request: HTTPRequest
|
|
) -> Result<HTTPResponse<Data?>, Failure> {
|
|
return self.flatMap { body in
|
|
return .success(
|
|
.init(
|
|
httpStatusCode: response.httpStatusCode,
|
|
responseHeaders: response.allHeaderFields,
|
|
body: body
|
|
)
|
|
)
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
extension Result where Success == VerifiedHTTPResponse<Data>, Failure == NetworkError {
|
|
|
|
// Parses a `Result<VerifiedHTTPResponse<Data>>` to `Result<VerifiedHTTPResponse<Value>>`
|
|
func parseResponse<Value: HTTPResponseBody>() -> VerifiedHTTPResponse<Value>.Result {
|
|
return self.parseResponse { data, statusCode in
|
|
try Value.create(with: data, httpStatusCode: statusCode)
|
|
}
|
|
}
|
|
|
|
/// Parses a response using a request-specific decoder while preserving standard network decoding errors.
|
|
func parseResponse<Value: HTTPResponseBody>(
|
|
using create: (Data, HTTPStatusCode) throws -> Value
|
|
) -> VerifiedHTTPResponse<Value>.Result {
|
|
return self.flatMap { response in // Convert the `Result` type
|
|
Result<VerifiedHTTPResponse<Value>, Error> { // Create a new `Result<Value>`
|
|
try response.mapBody { data in // Convert the from `Data` -> `Value`
|
|
try create(data, response.httpStatusCode)
|
|
}
|
|
.copyWithNewRequestDate() // Update request date for 304 responses
|
|
}
|
|
// Convert decoding errors into `NetworkError.decoding`
|
|
.mapError { NetworkError.decoding($0, response.response.body) }
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
extension Result where Success == VerifiedHTTPResponse<Data>, Failure == NetworkError {
|
|
|
|
// Converts an unsuccessful response into a `Result.failure`
|
|
fileprivate func convertUnsuccessfulResponseToError() -> Self {
|
|
return self.flatMap {
|
|
$0.response.httpStatusCode.isSuccessfulResponse
|
|
? .success($0)
|
|
: .failure($0.response.parseUnsuccessfulResponse())
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
private extension VerifiedHTTPResponse {
|
|
|
|
func copyWithNewRequestDate() -> Self {
|
|
// Update request time from server unless it failed verification.
|
|
guard self.verificationResult != .failed, let requestDate = self.requestDate else { return self }
|
|
|
|
return self.mapBody {
|
|
return $0.copy(with: requestDate)
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
extension HTTPResponseType {
|
|
|
|
var isLoadShedder: Bool {
|
|
return self.value(forHeaderField: HTTPClient.ResponseHeader.isLoadShedder) == "true"
|
|
}
|
|
|
|
}
|
|
|
|
private extension HTTPResponseType {
|
|
|
|
var metadata: HTTPClient.ResponseMetadata {
|
|
return .init(
|
|
requestID: self.value(forHeaderField: HTTPClient.ResponseHeader.requestID),
|
|
amazonTraceID: self.value(forHeaderField: HTTPClient.ResponseHeader.amazonTraceID)
|
|
)
|
|
}
|
|
|
|
}
|
|
|
|
private extension HTTPResponse where Body == Data {
|
|
|
|
func parseUnsuccessfulResponse() -> NetworkError {
|
|
let contentType = self.value(forHeaderField: HTTPClient.ResponseHeader.contentType) ?? ""
|
|
let isJSON = contentType.starts(with: "application/json")
|
|
|
|
return .errorResponse(
|
|
isJSON
|
|
? .from(self.body)
|
|
: .defaultResponse,
|
|
self.httpStatusCode
|
|
)
|
|
}
|
|
|
|
}
|