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/*
* This file is part of GNU Taler
* (C) 2021 Taler Systems S.A.
*
* GNU Taler is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3, or (at your option) any later version.
*
* GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import Foundation
public protocol IonoMessageHandler: AnyObject {
func handleMessage(message: String)
}
func notification_callback(payload: Optional<UnsafePointer<Int8>>,
userdata: Optional<UnsafeMutableRawPointer>) {
let native = Unmanaged<Iono>.fromOpaque(userdata!).takeUnretainedValue()
let string = String(cString: payload!)
native.internalOnNotify(payload: string)
}
struct Queue<T> {
var contents: [T]
init() {
self.contents = []
}
mutating func push(_ element: T) {
contents.append(element)
}
mutating func pop() -> T? {
if (contents.isEmpty) {
return nil
} else {
return contents.remove(at: 0)
}
}
}
class NodeThread: Thread {
weak var iono: Iono!
var workQueue: Queue<() -> ()>
var initialized: Bool
var initCondition: NSCondition
override init() {
self.workQueue = Queue<() -> ()>()
self.initialized = false
self.initCondition = NSCondition()
super.init()
}
override func main() {
iono.instance = __initNative()
__setNotifyHandler(iono.instance, notification_callback, Unmanaged.passUnretained(iono).toOpaque())
self.initialized = true
initCondition.broadcast()
while true {
__runNode(iono.instance)
while let workItem = workQueue.pop() {
workItem()
}
if iono.stopped {
break
}
}
}
func waitUntilInitialized(block: @escaping () -> ()) {
if (self.initialized) {
block()
return
}
initCondition.lock()
while (!self.initialized) {
initCondition.wait()
}
block()
initCondition.unlock()
}
}
public class Iono {
var stopped: Bool
var thread: NodeThread
var instance: OpaquePointer!
public weak var messageHandler: IonoMessageHandler?
public init() {
self.stopped = false
self.thread = NodeThread()
self.thread.iono = self
self.thread.start()
}
deinit {
__destroyNative(instance)
}
private func scheduleNodeThreadAsync(block: @escaping () -> ()) {
thread.waitUntilInitialized {
self.thread.workQueue.push(block)
self.notifyNative()
}
}
private func scheduleNodeThreadSync(block: @escaping () -> Void) {
var hasExecuted = false
let executeCondition = NSCondition()
executeCondition.lock()
thread.waitUntilInitialized {
self.thread.workQueue.push {
block()
hasExecuted = true
executeCondition.broadcast()
}
self.notifyNative()
}
while (!hasExecuted) {
executeCondition.wait()
}
executeCondition.unlock()
}
public func internalOnNotify(payload: String) {
if let handler = messageHandler {
handler.handleMessage(message: payload)
}
}
public func notifyNative() {
__notifyNative(instance)
}
public func evalSimpleJs(source: String) -> String {
var result: String?
scheduleNodeThreadSync {
let cResult = __evalJs(self.instance, source.cString(using: .utf8))
if let cStr = cResult {
result = String(cString: cStr)
free(cResult)
}
}
return result!
}
public func evalNodeCode(source: String) {
scheduleNodeThreadAsync {
__makeCallbackNative(self.instance, source.cString(using: .utf8))
}
}
public func sendMessage(message: String) {
let encoded = message.data(using: .utf8)!.base64EncodedString()
let source = """
if (global.__native_onMessage) {
const msg = (new Buffer('\(encoded)', 'base64')).toString('ascii');
global.__native_onMessage(msg);
} else {
console.log("WARN: no __native_onMessage defined");
}
"""
evalNodeCode(source: source)
}
/// Note: This *must* be called before releasing the object, or else the thread will keep going.
public func waitStopped() {
scheduleNodeThreadSync {
self.stopped = true
}
thread.cancel()
}
public func putModuleCode(modName: String, code: String) {
__putModuleCodeNative(self.instance, modName.cString(using: .utf8),
code.cString(using: .utf8))
}
}
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