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The purpose of the different modules wasn’t clearly defined, which lead to inconsistent responsibilities between the different modules. Define each module’s purpose and move a few files between modules to satisfy these definitions. There are a few more larger changes that will need to be made for a fully consistent module structure. These are FIXMEs in the new Modules.md document and I’ll address them in follow-up PRs.
51 lines
2.1 KiB
Swift
51 lines
2.1 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import Foundation
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import SwiftExtensions
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/// Gathers data from a stdout or stderr pipe. When it has accumulated a full line, calls the handler to handle the
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/// string.
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public actor PipeAsStringHandler {
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/// Queue on which all data from the pipe will be handled. This allows us to have a
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/// nonisolated `handle` function but ensure that data gets processed in order.
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private let queue = AsyncQueue<Serial>()
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private var buffer = Data()
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/// The closure that actually handles
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private let handler: @Sendable (String) -> Void
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public init(handler: @escaping @Sendable (String) -> Void) {
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self.handler = handler
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}
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private func handleDataFromPipeImpl(_ newData: Data) {
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self.buffer += newData
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while let newlineIndex = self.buffer.firstIndex(of: UInt8(ascii: "\n")) {
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// Output a separate log message for every line in the pipe.
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// The reason why we don't output multiple lines in a single log message is that
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// a) os_log truncates log messages at about 1000 bytes. The assumption is that a single line is usually less
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// than 1000 bytes long but if we merge multiple lines into one message, we might easily exceed this limit.
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// b) It might be confusing why sometimes a single log message contains one line while sometimes it contains
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// multiple.
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handler(String(data: self.buffer[...newlineIndex], encoding: .utf8) ?? "<invalid UTF-8>")
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buffer = buffer[buffer.index(after: newlineIndex)...]
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}
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}
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public nonisolated func handleDataFromPipe(_ newData: Data) {
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queue.async {
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await self.handleDataFromPipeImpl(newData)
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}
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}
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}
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