72 lines
2.3 KiB
C#
72 lines
2.3 KiB
C#
using Inspectron.Epson;
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using Inspectron.Epson.PrintServer.Telemetry;
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namespace EpsonPrintService;
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public sealed class InsinTelemetryDiscoveredPrintersReceiver : IDiscoveredPrintersReceiver
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{
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private readonly IDiscoveredPrintersReceiver _inner;
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private readonly IInsinTelemetry _telemetry;
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private readonly HashSet<string> _seenIps = new();
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private readonly Dictionary<string, bool> _present = new();
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private readonly object _stateLock = new();
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public InsinTelemetryDiscoveredPrintersReceiver(
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IDiscoveredPrintersReceiver inner,
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IInsinTelemetry telemetry)
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{
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_inner = inner;
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_telemetry = telemetry;
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}
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public async Task OnPrintersDiscoveredAsync(IReadOnlyList<DiscoveredPrinter> printers)
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{
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await _inner.OnPrintersDiscoveredAsync(printers);
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List<(string kind, string message)> toEmit;
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lock (_stateLock)
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{
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toEmit = ComputeEvents(printers);
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}
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foreach (var (kind, message) in toEmit)
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{
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try { _telemetry.Emit(kind, message); }
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catch { /* swallow: telemetry must never break discovery */ }
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}
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}
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private List<(string, string)> ComputeEvents(IReadOnlyList<DiscoveredPrinter> printers)
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{
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var events = new List<(string, string)>();
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var currentIps = new HashSet<string>();
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foreach (var p in printers)
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{
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if (string.IsNullOrEmpty(p.IPAddress)) continue;
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currentIps.Add(p.IPAddress);
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if (_seenIps.Add(p.IPAddress))
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events.Add((InsinEventKinds.PrinterDiscovered,
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InsinMessageFormatter.Format(("printer", p.IPAddress), ("model", p.ModelName))));
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if (!_present.TryGetValue(p.IPAddress, out var wasPresent) || !wasPresent)
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events.Add((InsinEventKinds.PrinterOnline,
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InsinMessageFormatter.Format(("printer", p.IPAddress))));
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_present[p.IPAddress] = true;
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}
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foreach (var kv in _present.ToList())
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{
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if (kv.Value && !currentIps.Contains(kv.Key))
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{
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events.Add((InsinEventKinds.PrinterOffline,
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InsinMessageFormatter.Format(("printer", kv.Key))));
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_present[kv.Key] = false;
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}
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}
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return events;
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}
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}
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