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SignalR Logging: Add ActivitySource for server and client (#34201)
* SignalR Logging: Add ActivitySource * Moved new tracing section, made corrections * Minor change intro ActivitySource * Edit sweep of the rest of doc, minor changes * More minor editing on rest of doc
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aspnetcore/signalr/diagnostics.md

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using Microsoft.AspNetCore.SignalR;
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namespace SignalRChat.Hubs
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{
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public class ChatHub : Hub
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{
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public async Task SendMessage(string user, string message)
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{
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await Clients.All.SendAsync("ReceiveMessage", user, message);
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}
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}
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}
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@page
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@model ErrorModel
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@{
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ViewData["Title"] = "Error";
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}
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<h1 class="text-danger">Error.</h1>
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<h2 class="text-danger">An error occurred while processing your request.</h2>
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@if (Model.ShowRequestId)
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{
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<p>
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<strong>Request ID:</strong> <code>@Model.RequestId</code>
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</p>
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}
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<h3>Development Mode</h3>
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<p>
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Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
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</p>
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<p>
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<strong>The Development environment shouldn't be enabled for deployed applications.</strong>
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It can result in displaying sensitive information from exceptions to end users.
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For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
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and restarting the app.
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</p>
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using System.Diagnostics;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.RazorPages;
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namespace SignalRChat.Pages
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{
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[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
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[IgnoreAntiforgeryToken]
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public class ErrorModel : PageModel
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{
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public string? RequestId { get; set; }
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public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
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private readonly ILogger<ErrorModel> _logger;
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public ErrorModel(ILogger<ErrorModel> logger)
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{
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_logger = logger;
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}
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public void OnGet()
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{
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RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
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}
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}
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}
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@page
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<div class="container">
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<div class="row p-1">
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<div class="col-1">User</div>
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<div class="col-5"><input type="text" id="userInput" /></div>
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</div>
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<div class="row p-1">
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<div class="col-1">Message</div>
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<div class="col-5"><input type="text" class="w-100" id="messageInput" /></div>
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</div>
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<div class="row p-1">
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<div class="col-6 text-end">
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<input type="button" id="sendButton" value="Send Message" />
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</div>
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</div>
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<div class="row p-1">
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<div class="col-6">
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<hr />
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</div>
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</div>
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<div class="row p-1">
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<div class="col-6">
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<ul id="messagesList"></ul>
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</div>
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</div>
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</div>
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<script src="~/js/signalr/dist/browser/signalr.js"></script>
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<script src="~/js/chat.js"></script>
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.RazorPages;
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namespace SignalRChat.Pages
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{
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public class IndexModel : PageModel
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{
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private readonly ILogger<IndexModel> _logger;
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public IndexModel(ILogger<IndexModel> logger)
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{
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_logger = logger;
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}
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public void OnGet()
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{
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}
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}
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}
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@page
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@model PrivacyModel
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@{
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ViewData["Title"] = "Privacy Policy";
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}
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<h1>@ViewData["Title"]</h1>
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<p>Use this page to detail your site's privacy policy.</p>
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.RazorPages;
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namespace SignalRChat.Pages
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{
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public class PrivacyModel : PageModel
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{
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private readonly ILogger<PrivacyModel> _logger;
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public PrivacyModel(ILogger<PrivacyModel> logger)
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{
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_logger = logger;
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}
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public void OnGet()
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{
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}
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}
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}

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