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fix Payload maximum size exceeded error for Live Activities (#513) 

Live Activities have maximum payload size of 4kB.
At least Libre 2 EU produces so many values that they cannot be pushed to Live Activity unfiltered,
causing Live Activity start to fail with error: Payload maximum size exceeded.

Fix by downsampling (just pick every nth reading) to maximum of 100 readings.
The threshold value is got by trial and error, then tuning it down a bit to leave some room for different length strings.
This commit is contained in:
Samuli Tamminen 2024-03-29 15:43:27 +02:00 committed by GitHub
parent 0465f2f398
commit 67cf698766
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1 changed files with 12 additions and 3 deletions
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15
xdrip/View Controllers/Root View Controller/RootViewController.swift
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@ -3497,9 +3497,18 @@ final class RootViewController: UIViewController, ObservableObject {
// create two simple arrays to send to the live activiy. One with the bg values in mg/dL and another with the corresponding timestamps
// this is needed due to the not being able to pass structs that are not codable/hashable
let hoursOfBgReadingsToSend: Double = 12
let bgReadings = bgReadingsAccessor.getLatestBgReadings(limit: nil, fromDate: Date().addingTimeInterval(-3600 * hoursOfBgReadingsToSend), forSensor: nil, ignoreRawData: true, ignoreCalculatedValue: false)
let allBgReadings = bgReadingsAccessor.getLatestBgReadings(limit: nil, fromDate: Date().addingTimeInterval(-3600 * hoursOfBgReadingsToSend), forSensor: nil, ignoreRawData: true, ignoreCalculatedValue: false)
// Live Activities have maximum payload size of 4kB.
// This value is selected by testing how much we can send before getting the "Payload maximum size exceeded" error.
let maxNumberOfReadings = 100
// If there are more readings than we can send to the Live Activity, downsample the values to fit.
let bgReadings = allBgReadings.count > maxNumberOfReadings
? (0 ..< maxNumberOfReadings).map { allBgReadings[$0 * allBgReadings.count / maxNumberOfReadings] }
: allBgReadings
if bgReadings.count > 0 {
var slopeOrdinal: Int = 0