72 lines
3 KiB
Swift
72 lines
3 KiB
Swift
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import Foundation
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/// Messages exchanged with the Tangent Hub bridge.
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/// Wire framing: u32 little-endian length + JSON payload.
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/// NOTE: real Tangent Hub TIPC is a binary protocol on TCP 64246; this JSON
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/// framing is our internal bridge format — the macOS TIPC shim translates.
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/// Framing/parse logic (buffering, partial frames) is identical either way.
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public enum TangentMessage: Equatable, Sendable {
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case controlUpdate(PanelInput)
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case displayUpdate(line: Int, text: String)
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}
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public enum TangentWireError: Error {
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case badPayload
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}
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public enum TangentWire {
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public static func encode(_ msg: TangentMessage) -> Data {
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var obj: [String: Any] = [:]
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switch msg {
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case .controlUpdate(.encoder(let id, let delta)):
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obj = ["type": "encoder", "id": id, "delta": delta]
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case .controlUpdate(.button(let id, let pressed)):
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obj = ["type": "button", "id": id, "pressed": pressed]
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case .displayUpdate(let line, let text):
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obj = ["type": "display", "line": line, "text": text]
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}
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let payload = (try? JSONSerialization.data(withJSONObject: obj, options: [.sortedKeys])) ?? Data()
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var out = Data()
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var len = UInt32(payload.count).littleEndian
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withUnsafeBytes(of: &len) { out.append(contentsOf: $0) }
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out.append(payload)
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return out
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}
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/// Decode first complete frame from buffer, consuming it. nil if incomplete.
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public static func decodeFirst(_ buffer: inout Data) throws -> TangentMessage? {
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guard buffer.count >= 4 else { return nil }
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// Byte-wise LE assembly (Data slices may be misaligned for u32 loads).
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let b = [UInt8](buffer.prefix(4))
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let length = UInt32(b[0]) | (UInt32(b[1]) << 8) | (UInt32(b[2]) << 16) | (UInt32(b[3]) << 24)
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guard buffer.count >= 4 + Int(length) else { return nil }
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let payload = buffer.subdata(in: buffer.startIndex + 4..<buffer.startIndex + 4 + Int(length))
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buffer.removeFirst(4 + Int(length))
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guard let obj = try? JSONSerialization.jsonObject(with: payload) as? [String: Any],
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let type = obj["type"] as? String else {
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throw TangentWireError.badPayload
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}
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switch type {
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case "encoder":
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guard let id = obj["id"] as? Int, let delta = obj["delta"] as? Int else {
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throw TangentWireError.badPayload
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}
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return .controlUpdate(.encoder(id: id, delta: delta))
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case "button":
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guard let id = obj["id"] as? Int, let pressed = obj["pressed"] as? Bool else {
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throw TangentWireError.badPayload
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}
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return .controlUpdate(.button(id: id, pressed: pressed))
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case "display":
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guard let line = obj["line"] as? Int, let text = obj["text"] as? String else {
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throw TangentWireError.badPayload
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}
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return .displayUpdate(line: line, text: text)
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default:
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throw TangentWireError.badPayload
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}
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}
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}
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