![](/img/trans.png)
[英]app with Objective-C and swift code crash at launch in release mode, debug mode fine
[英]Not connecting to RPC server in release mode, but works fine in debug mode
我有一個命令行應用程序,它執行以下操作:
以上在調試模式下工作正常。 但是,當我為發布構建並嘗試直接運行或從 launchd 運行時,它總是超時。 最相關的代碼在下面的main.swift
中。
private func getTransmissionClient() -> Transmission? {
let client = Transmission(
baseURL: serverConfig.server,
username: serverConfig.username,
password: serverConfig.password)
var cancellables = Set<AnyCancellable>()
let group = DispatchGroup()
group.enter()
print("[INFO] Connecting to client")
client.request(.rpcVersion)
.sink(
receiveCompletion: { _ in group.leave() },
receiveValue: { rpcVersion in
print("[INFO]: Successfully Connected! RPC Version: \(rpcVersion)")
})
.store(in: &cancellables)
let wallTimeout = DispatchWallTime.now() +
DispatchTimeInterval.seconds(serverConfig.secondsTimeout ?? 15)
let res = group.wait(wallTimeout: wallTimeout)
if res == DispatchTimeoutResult.success {
return client
} else {
return nil
}
}
public func updateTransmission() throws {
print("[INFO] [\(Date())] Starting Transmission Update")
let clientOpt = getTransmissionClient()
guard let client = clientOpt else {
print("[ERROR] Failed to connect to transmission client")
exit(1)
}
var cancellables = Set<AnyCancellable>()
let items = try store.getPendingDownload()
print("[INFO] [\(Date())] Adding \(items.count) new items to transmission")
let group = DispatchGroup()
for item in items {
let linkComponents = "\(item.link)".components(separatedBy: "&")
assert(linkComponents.count > 0, "Link seems wrong")
group.enter()
client.request(.add(url: item.link))
.sink(receiveCompletion: { completion in
if case let .failure(error) = completion {
print("[Failure] \(item.title)")
print("[Failure] Details: \(error)")
}
group.leave()
}, receiveValue: { _ in
print("[Success] \(item.title)")
do {
try self.store.update(item: item, with: .downloaded)
} catch {
print("[Error] Couldn't save new status to DB")
}
})
.store(in: &cancellables)
}
let wallTimeout = DispatchWallTime.now() +
DispatchTimeInterval.seconds(serverConfig.secondsTimeout ?? 15)
let res = group.wait(wallTimeout: wallTimeout)
if res == DispatchTimeoutResult.success {
print("Tasks successfully submitted")
} else {
print("Timed out")
exit(1)
}
}
奇怪的是,在我添加數據庫之前,代碼似乎運行良好。 DispatchGroup 以及 Transmission-Swift 客戶端已經存在。 我猜我所做的事情是被編譯器“優化掉”了? 這只是猜測,雖然在 StackOverflow 上看到了其他一些問題,但我仍然不清楚。
我正在使用 macOS 10.15 和 Swift 5.2.2。
github中可用的完整代碼(鏈接到有錯誤的特定提交)
此提交修復了它,它基本上執行以下操作:
diff --git a/Sources/TorrentRSS/TorrentRSS.swift b/Sources/TorrentRSS/TorrentRSS.swift
index 17e1a6b..0b80cd5 100644
--- a/Sources/TorrentRSS/TorrentRSS.swift
+++ b/Sources/TorrentRSS/TorrentRSS.swift
@@ -63,6 +63,10 @@ public struct TorrentRSS {
DispatchTimeInterval.seconds(serverConfig.secondsTimeout ?? 15)
let res = group.wait(wallTimeout: wallTimeout)
+ for cancellable in cancellables {
+ cancellable.cancel()
+ }
+
if res == DispatchTimeoutResult.success {
return client
} else {
@@ -117,6 +121,11 @@ public struct TorrentRSS {
let wallTimeout = DispatchWallTime.now() +
DispatchTimeInterval.seconds(serverConfig.secondsTimeout ?? 15)
let res = group.wait(wallTimeout: wallTimeout)
+
+ for cancellable in cancellables {
+ cancellable.cancel()
+ }
+
if res == DispatchTimeoutResult.success {
print("Tasks successfully submitted")
} else {
顯式調用可取消可避免 object 提前被處理掉。 該特定位置是我打算處理 object 的地方,而不是更早。
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