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FileSink.swift
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FileSink.swift
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//
// FileSink.swift
// Carthage
//
// Created by Justin Spahr-Summers on 2015-03-06.
// Copyright (c) 2015 Carthage. All rights reserved.
//
import Foundation
import Result
import ReactiveCocoa
/// Represents anything that can be written directly to a file.
public protocol FileWriteable {
// TODO: Error handling.
func writeToFile(filePointer: UnsafeMutablePointer<FILE>)
}
extension NSData: FileWriteable {
public func writeToFile(filePointer: UnsafeMutablePointer<FILE>) {
fwrite(bytes, length, 1, filePointer)
}
}
extension String: FileWriteable {
public func writeToFile(filePointer: UnsafeMutablePointer<FILE>) {
fputs(self, filePointer)
}
}
/// A sink which streams its events to a file handle.
public final class FileSink<T: FileWriteable>: SinkType {
private var filePointer: UnsafeMutablePointer<FILE>?
private let closeWhenDone: Bool
/// Creates a sink that will take over the given FILE * pointer.
private init(filePointer: UnsafeMutablePointer<FILE>, closeWhenDone: Bool) {
setlinebuf(filePointer)
self.filePointer = filePointer
self.closeWhenDone = closeWhenDone
}
/// Creates a sink that will take over the given file descriptor.
private class func sinkWithDescriptor(fileDescriptor: Int32, closeWhenDone: Bool) -> SignalProducer<FileSink, NSError> {
return SignalProducer.try {
let pointer = fdopen(fileDescriptor, "a")
if pointer == nil {
return .failure(NSError(domain: NSPOSIXErrorDomain, code: Int(errno), userInfo: nil))
} else {
return .success(self(filePointer: pointer, closeWhenDone: closeWhenDone))
}
}
}
/// Creates a sink that will open and write to a temporary file.
///
/// Sends the created sink and the URL to the temporary file.
public class func openTemporaryFile() -> SignalProducer<(FileSink, NSURL), NSError> {
return SignalProducer.try {
var temporaryDirectoryTemplate: ContiguousArray<CChar> = NSTemporaryDirectory().stringByAppendingPathComponent("carthage-xcodebuild.XXXXXX.log").nulTerminatedUTF8.map { CChar($0) }
let logFD = temporaryDirectoryTemplate.withUnsafeMutableBufferPointer { (inout template: UnsafeMutableBufferPointer<CChar>) -> Int32 in
return mkstemps(template.baseAddress, 4)
}
if logFD < 0 {
return .failure(NSError(domain: NSPOSIXErrorDomain, code: Int(errno), userInfo: nil))
}
let temporaryPath = temporaryDirectoryTemplate.withUnsafeBufferPointer { (ptr: UnsafeBufferPointer<CChar>) -> String in
return String.fromCString(ptr.baseAddress)!
}
return .success((logFD, temporaryPath))
}
|> map { logFD, temporaryPath in
return self.sinkWithDescriptor(logFD, closeWhenDone: true)
|> map { ($0, NSURL.fileURLWithPath(temporaryPath, isDirectory: false)!) }
}
|> flatten(.Merge)
}
/// Creates a sink that will write to `stdout`.
public class func standardOutputSink() -> FileSink {
return self(filePointer: stdout, closeWhenDone: false)
}
/// Creates a sink that will write to `stderr`.
public class func standardErrorSink() -> FileSink {
return self(filePointer: stderr, closeWhenDone: false)
}
/// Flushes the file, and closes it if appropriate.
private func done() {
if let filePointer = filePointer {
fflush(filePointer)
if closeWhenDone {
fclose(filePointer)
}
}
filePointer = nil
}
/// Writes the event data to the file, or the error if one occurred.
///
/// Upon a terminating event, the file will be flushed, and closed if
/// appropriate.
public func put(event: Event<T, NoError>) {
if let filePointer = filePointer {
switch event {
case let .Next(value):
value.value.writeToFile(filePointer)
default:
if event.isTerminating {
done()
}
}
}
}
deinit {
done()
}
}