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Add support for opting out of streaming HTTP bodies #68

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Merged
merged 16 commits into from
Apr 2, 2025
Merged

Add support for opting out of streaming HTTP bodies #68

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ccc11f9
Making choice of implementation public
hactar Mar 25, 2025
e0b007b
Adding HTTPBodyProcessingMode
hactar Mar 26, 2025
9fd926a
Making platformDefault private again
hactar Mar 26, 2025
a3d13fb
Making platformDefault private again
hactar Mar 26, 2025
d62e3cf
linting
hactar Mar 26, 2025
adb6c07
moving HTTPBodyProcessingMode from public enum to public struct
hactar Mar 28, 2025
a1b1562
removing .streamed HTTPBodyProcessingMode
hactar Apr 1, 2025
fb49a88
fixing testing issues
hactar Apr 1, 2025
9df230c
fixing testing issues
hactar Apr 1, 2025
beb7d45
Merge branch 'main' into main
hactar Apr 1, 2025
2f280f0
explicitly keeping init(session:)
hactar Apr 1, 2025
57dfdeb
improving comments
hactar Apr 1, 2025
43fd210
improving comments
hactar Apr 1, 2025
5617c4d
adding .shared
hactar Apr 1, 2025
9fd56c1
removing unneeded change to URLSessionTransport init
hactar Apr 1, 2025
1a685fc
removing whitespace changes
hactar Apr 1, 2025
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32 changes: 31 additions & 1 deletion Sources/OpenAPIURLSession/URLSessionTransport.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,32 @@ public struct URLSessionTransport: ClientTransport {
/// - Parameter session: The URLSession used for performing HTTP operations.
/// If none is provided, the system uses the shared URLSession.
public init(session: URLSession = .shared) { self.init(session: session, implementation: .platformDefault) }
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Adding new parameters to existing functions is an API break, as caught by CI.

1 breaking change detected in OpenAPIURLSession:
  💔 API breakage: constructor URLSessionTransport.Configuration.init(session:) has been removed

We'd need to preserve this symbol that calls through to the new one.

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I'm not sure I understand the issue.

The new API provides public init(session: URLSession = .shared, httpBodyProcessingMode: HTTPBodyProcessingMode = .platformDefault) - and as there is a default parameter for httpBodyProcessingMode, doesn't Swift auto generate a public init(session: URLSession) for us?

The following code in my app compiles fine:

    func testFunction() async throws {
        
        let sessionConfiguration = URLSessionConfiguration.default
        let otherSession = URLSession(configuration: sessionConfiguration)
        
        let transportConfiguration = URLSessionTransport.Configuration.init(session: .shared)
        let otherTransportConfiguration = URLSessionTransport.Configuration.init(session: otherSession)
        
        
        let transport1 = URLSessionTransport(configuration: transportConfiguration)
        let transport2 = URLSessionTransport(configuration: otherTransportConfiguration)
        
        let client1 = Client(serverURL: URL(string: "https://example.com")!, transport: transport1)
        let client2 = Client(serverURL: URL(string: "https://example.com")!, transport: transport2)
        
        _ = try await client1.get_sol_Appversions_sol_All()
        _ = try await client2.get_sol_Appversions_sol_All()
    }

So to me, there still is an (implicit) URLSessionTransport.Configuration.init(session:) - isn't this API breakage error a false positive?

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It's not a false positive. It's possible to refer to the function itself (e.g. let initializer = URLSessionTransport.Configuration.init(session:)) which won't work if the function is no longer present.

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Thanks for the explanation. Interesting, I wasn't aware of this limitation of default parameter values. I have added back the old single parameter init.


/// Specifies the mode in which HTTP request and response bodies are processed.
public enum HTTPBodyProcessingMode {
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We generally do not use enums in public API because, right now, they are not extensible without breaking API. Instead for enum-like public API, we wrap an internal enum in a public struct with public static properties.

/// Processes the HTTP body incrementally as bytes become available.
///
/// Use this mode to handle large payloads efficiently or to begin processing
/// before the entire body has been received. Will throw a `URLSessionTransportError.streamingNotSupported`
/// error if not available on the platform.
case streamed

/// Waits until the entire HTTP body has been received before processing begins.
///
/// Use this mode when it's necessary or simpler to handle complete data payloads at once.
case buffered
}

public init(session: URLSession = .shared, httpBodyProcessingMode: HTTPBodyProcessingMode) {
self.session = session
switch httpBodyProcessingMode {

case .streamed:
self.implementation = .defaultStreaming
case .buffered:
self.implementation = .buffering
}
}

enum Implementation {
case buffering
Expand Down Expand Up @@ -354,7 +380,11 @@ extension URLSessionTransport.Configuration.Implementation {

static var platformDefault: Self {
guard platformSupportsStreaming else { return .buffering }
return .streaming(
return .defaultStreaming
}

static var defaultStreaming: Self {
.streaming(
requestBodyStreamBufferSize: 16 * 1024,
responseBodyStreamWatermarks: (low: 16 * 1024, high: 32 * 1024)
)
Expand Down
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