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FEAT: Add Sockets handler for octoprint push events
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| // | ||
| // OctoPrintPushEvents.swift | ||
| // OctoPhone | ||
| // | ||
| // Created by Josef Dolezal on 13/05/2017. | ||
| // Copyright © 2017 Josef Dolezal. All rights reserved. | ||
| // | ||
|
|
||
| import enum Result.NoError | ||
| import ReactiveSwift | ||
|
|
||
| /// Shorthand for temperatures values | ||
| typealias PrinterTemperatures = (bed: Bed, tool: Tool) | ||
|
|
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| /// OctoPrint Push events provider | ||
| class OctoPrintPushEvents { | ||
|
|
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| /// URL of connection target | ||
| private let url: URL | ||
|
|
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| /// Web sockets connection provider | ||
| private let sockets = WebSocket() | ||
|
|
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| init(url: URL) { | ||
| // Connects to random printer socket stream | ||
| self.url = url.appendingPathComponent("/sockjs/286/sd3d24ew/xhr_streaming") | ||
| } | ||
|
|
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| /// Stream of current temperatures of printers, | ||
| /// the signal is endless and must be disposed manually | ||
| func temperatures() -> SignalProducer<PrinterTemperatures, NoError> { | ||
| return currentPrinterState().map { json -> PrinterTemperatures? in | ||
|
|
||
| guard | ||
| let temperaturesObject = json["temps"] as? [[String: Any]], | ||
| let toolObject = temperaturesObject.first?["tool0"] as? [String: Any], | ||
| let bedObject = temperaturesObject.first?["bed"] as? [String: Any], | ||
| let tool = try? Tool.fromJSON(json: toolObject), | ||
| let bed = try? Bed.fromJSON(json: bedObject) | ||
| else { | ||
| return nil | ||
| } | ||
|
|
||
| return (bed, tool) | ||
| } | ||
| .skipNil() | ||
| } | ||
|
|
||
| /// Reads only current printer state from sockets, filters out all different events | ||
| /// | ||
| /// - Returns: Signal of current printer states | ||
| private func currentPrinterState() -> SignalProducer<[String: Any], NoError> { | ||
| return connect().map({ | ||
| return $0["current"] as? [String: Any] | ||
| }) | ||
| .skipNil() | ||
| } | ||
|
|
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| /// Creates a generic connection requests and converts response data to valid JSON | ||
| /// | ||
| /// - Returns: Signal with response JSONs | ||
| private func connect() -> SignalProducer<[String: Any], NoError> { | ||
|
|
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| let connection = sockets.connect(url: url, withMethod: .post) | ||
|
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| return SignalProducer { sink, disposable in | ||
|
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| let requestDisposable = connection.startWithValues { data in | ||
| guard let response = String(data: data, encoding: .utf8) else { return } | ||
|
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| let startIndex = response.index(after: response.startIndex) | ||
|
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| // Strip the first character from value | ||
| let cleanString = response.substring(from: startIndex) | ||
|
|
||
| // Splits OctoPrint outputs into single lines | ||
| cleanString.enumerateLines(invoking: { line, _ in | ||
| guard | ||
| let strippedData = line.data(using: .utf8), | ||
| let object = try? JSONSerialization.jsonObject(with: strippedData, options: .allowFragments), | ||
| let json = object as? [[String: Any]] | ||
| else { return } | ||
|
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| // The OctoPrint returns array in which is the key-value object | ||
| if let json = json.first { | ||
| sink.send(value: json) | ||
| } | ||
| }) | ||
| } | ||
|
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||
| disposable.add { | ||
| requestDisposable.dispose() | ||
| } | ||
| } | ||
| .filter { $0.count > 0 } | ||
| } | ||
| } |