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| 1 | import Foundation |
| 2 | |
| 3 | /// Bound before decoding: AsyncBytes.lines can allocate an unbounded line. |
| 4 | /// Package access so ScriptedTransport frames streams exactly as NativeHTTP does. |
| 5 | package struct NativeStreamLines { |
| 6 | private var buffer = Data() |
| 7 | private var eventBytes = 0 |
| 8 | private var afterCR = false |
| 9 | private var firstLine = true |
| 10 | let lineLimit: Int |
| 11 | let eventLimit: Int |
| 12 | |
| 13 | package init(lineLimit: Int = 256 * 1024, eventLimit: Int = 1024 * 1024) { |
| 14 | self.lineLimit = lineLimit |
| 15 | self.eventLimit = eventLimit |
| 16 | } |
| 17 | |
| 18 | package mutating func append(_ byte: UInt8) throws -> String? { |
| 19 | if afterCR { |
| 20 | afterCR = false |
| 21 | if byte == 10 { return nil } |
| 22 | } |
| 23 | if byte == 10 || byte == 13 { |
| 24 | afterCR = byte == 13 |
| 25 | guard var line = String(data: buffer, encoding: .utf8) else { |
| 26 | throw NativeClientError.message("The live connection returned invalid text.") |
| 27 | } |
| 28 | if firstLine { |
| 29 | firstLine = false |
| 30 | if line.hasPrefix("\u{FEFF}") { line.removeFirst() } |
| 31 | } |
| 32 | buffer.removeAll(keepingCapacity: true) |
| 33 | if line.isEmpty { eventBytes = 0 } |
| 34 | return line |
| 35 | } |
| 36 | guard buffer.count < lineLimit, eventBytes < eventLimit else { |
| 37 | throw NativeClientError.message("The live update is too large. Reconnect to refresh it.") |
| 38 | } |
| 39 | buffer.append(byte) |
| 40 | eventBytes += 1 |
| 41 | return nil |
| 42 | } |
| 43 | } |
| 44 | |
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