COVIDSafe code from version 2.0 (#37)

CovidSafe/Herald/Sensor/Data/DetectionLog.swift

@@ -0,0 +1,88 @@
+//
+//  DetectionLog.swift
+//
+//  Copyright 2020 VMware, Inc.
+//  SPDX-License-Identifier: MIT
+//
+
+import Foundation
+import UIKit
+
+/// CSV contact log for post event analysis and visualisation
+class DetectionLog: NSObject, SensorDelegate {
+    private let logger = ConcreteSensorLogger(subsystem: "Sensor", category: "Data.DetectionLog")
+    private let textFile: TextFile
+    private let payloadData: PayloadData
+    private let deviceName = UIDevice.current.name
+    private let deviceOS = UIDevice.current.systemVersion
+    private var payloads: Set<String> = []
+    private let queue = DispatchQueue(label: "Sensor.Data.DetectionLog.Queue")
+    
+    init(filename: String, payloadData: PayloadData) {
+        textFile = TextFile(filename: filename)
+        self.payloadData = payloadData
+        super.init()
+        write()
+    }
+    
+    private func csv(_ value: String) -> String {
+        return TextFile.csv(value)
+    }
+
+    private func write() {
+        var content = "\(csv(deviceName)),iOS,\(csv(deviceOS)),\(csv(payloadData.shortName))"
+        var payloadList: [String] = []
+        payloads.forEach() { payload in
+            guard payload != payloadData.shortName else {
+                return
+            }
+            payloadList.append(payload)
+        }
+        payloadList.sort()
+        payloadList.forEach() { payload in
+            content.append(",")
+            content.append(csv(payload))
+        }
+        logger.debug("write (content=\(content))")
+        content.append("\n")
+        textFile.overwrite(content)
+    }
+    
+    // MARK:- SensorDelegate
+    
+    func sensor(_ sensor: SensorType, didDetect: TargetIdentifier) {
+    }
+    
+    func sensor(_ sensor: SensorType, didRead: PayloadData, fromTarget: TargetIdentifier) {
+        queue.async {
+            if self.payloads.insert(didRead.shortName).inserted {
+                self.logger.debug("didRead (payload=\(didRead.shortName))")
+                self.write()
+            }
+        }
+    }
+    
+    func sensor(_ sensor: SensorType, didRead: PayloadData, fromTarget: TargetIdentifier, atProximity: Proximity, withTxPower: Int?) {
+        queue.async {
+            if self.payloads.insert(didRead.shortName).inserted {
+                self.logger.debug("didRead (payload=\(didRead.shortName))")
+                self.write()
+            }
+        }
+    }
+    
+    func sensor(_ sensor: SensorType, didMeasure: Proximity, fromTarget: TargetIdentifier) {
+    }
+    
+    func sensor(_ sensor: SensorType, didShare: [PayloadData], fromTarget: TargetIdentifier, atProximity: Proximity) {
+        didShare.forEach() { payloadData in
+            queue.async {
+                if self.payloads.insert(payloadData.shortName).inserted {
+                    self.logger.debug("didShare (payload=\(payloadData.shortName))")
+                    self.write()
+                }
+            }
+        }
+    }    
+
+}