Fix reading long files #549
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Pull Request Overview
This PR aims to fix an issue with reading long files by implementing asynchronous data accumulation during command execution. The change modifies the SystemUtils.swift file to handle potentially large output streams more effectively.
- Introduces asynchronous data reading using a readability handler to accumulate output incrementally
- Combines the accumulated data with any remaining data from the pipe before returning
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| guard data.isEmpty else { // End of file | ||
| return accumulatedOutput.append(data) | ||
| } | ||
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| handle.readabilityHandler = nil // Stop observing |
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The guard condition logic is inverted. When data.isEmpty is true, it indicates end of file, but the else block executes when data is NOT empty. This should be guard !data.isEmpty else { handle.readabilityHandler = nil; return } to properly handle the end-of-file condition.
| guard data.isEmpty else { // End of file | |
| return accumulatedOutput.append(data) | |
| } | |
| handle.readabilityHandler = nil // Stop observing | |
| guard !data.isEmpty else { // End of file | |
| handle.readabilityHandler = nil // Stop observing | |
| return | |
| } | |
| accumulatedOutput.append(data) |
| pipe.fileHandleForReading.readabilityHandler = { handle in | ||
| let data = handle.availableData | ||
| guard data.isEmpty else { // End of file | ||
| return accumulatedOutput.append(data) |
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The append method returns Void, but this is being used in a return statement. This line should just be accumulatedOutput.append(data) without the return keyword.
| return accumulatedOutput.append(data) | |
| accumulatedOutput.append(data) | |
| return |
| var accumulatedOutput = Data() | ||
| pipe.fileHandleForReading.readabilityHandler = { handle in | ||
| let data = handle.availableData | ||
| guard data.isEmpty else { // End of file | ||
| return accumulatedOutput.append(data) | ||
| } | ||
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| handle.readabilityHandler = nil // Stop observing | ||
| } |
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The accumulatedOutput variable is accessed from both the main thread and the readability handler callback without synchronization. This creates a potential race condition. Consider using a concurrent queue with barriers or other synchronization mechanism to ensure thread-safe access.
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I see. Just check it by yourselves.