blob: de1aad6d917fcee22569e175853c4d7cbf8477e2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
//
// TextFileStream.swift
// MullvadVPN
//
// Created by pronebird on 05/08/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
#if DEBUG
import Foundation
import Darwin
class TextFileStream<Codec> where Codec: UnicodeCodec {
let fileDescriptor: Int32
private let readSource: DispatchSourceRead
private let queue = DispatchQueue(label: "net.mullvad.MullvadVPN.TextFileStream<\(Codec.self)>")
private let stringStream: StringStreamIterator<Codec>
init?(fileURL: URL, separator: Character) {
let filePath = fileURL.path.utf8CString.map { $0 }
let fileDescriptor = open(filePath, O_RDONLY)
if (fileDescriptor == -1) {
return nil
}
// Avoid blocking the read operation
_ = fcntl(fileDescriptor, F_SETFL, O_NONBLOCK);
let readSource = DispatchSource.makeReadSource(fileDescriptor: fileDescriptor, queue: queue)
readSource.setCancelHandler {
close(fileDescriptor)
}
stringStream = StringStreamIterator(separator: separator)
self.readSource = readSource
self.fileDescriptor = fileDescriptor
}
deinit {
readSource.cancel()
}
func read(_ handler: @escaping (String) -> Void) {
readSource.setEventHandler { [weak self] in
guard let self = self else { return }
let estimated = Int(self.readSource.data + 1)
var buffer = [Codec.CodeUnit](repeating: 0, count: estimated)
let actual = Darwin.read(self.fileDescriptor, &buffer, estimated)
if actual == -1 {
print("TextFileStream<\(Codec.self)>: read error: \(errno)")
}
if actual > 0 {
let bytes = buffer[..<actual]
self.stringStream.append(bytes: bytes)
while let s = self.stringStream.next() {
handler(s)
}
}
}
readSource.activate()
}
func cancel() {
readSource.cancel()
}
}
#endif
|
