[zipkin\otlp] Call SendAsync on mobile (open-telemetry#5821)

Co-authored-by: Mikel Blanchard <[email protected]>

Author: lukyamuziB

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md

@@ -18,6 +18,10 @@ Notes](../../RELEASENOTES.md).
   Grace, etc.).
   ([#5808](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5808))
 
+  * Fixed `PlatformNotSupportedException`s being thrown during export when running
+  on mobile platforms which caused telemetry to be dropped silently.
+  ([#5821](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/5821))
+
 ## 1.9.0
 
 Released 2024-Jun-14

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExportClient/BaseOtlpHttpExportClient.cs

@@ -13,6 +13,9 @@ namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ExportClie
 internal abstract class BaseOtlpHttpExportClient<TRequest> : IExportClient<TRequest>
 {
     private static readonly ExportClientHttpResponse SuccessExportResponse = new ExportClientHttpResponse(success: true, deadlineUtc: default, response: null, exception: null);
+#if NET
+    private readonly bool synchronousSendSupportedByCurrentPlatform;
+#endif
 
     protected BaseOtlpHttpExportClient(OtlpExporterOptions options, HttpClient httpClient, string signalPath)
     {
@@ -27,6 +30,14 @@ protected BaseOtlpHttpExportClient(OtlpExporterOptions options, HttpClient httpC
         this.Endpoint = new UriBuilder(exporterEndpoint).Uri;
         this.Headers = options.GetHeaders<Dictionary<string, string>>((d, k, v) => d.Add(k, v));
         this.HttpClient = httpClient;
+
+#if NET
+        // See: https://github.com/dotnet/runtime/blob/280f2a0c60ce0378b8db49adc0eecc463d00fe5d/src/libraries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.cs#L767
+        this.synchronousSendSupportedByCurrentPlatform = !OperatingSystem.IsAndroid()
+            && !OperatingSystem.IsIOS()
+            && !OperatingSystem.IsTvOS()
+            && !OperatingSystem.IsBrowser();
+#endif
     }
 
     internal HttpClient HttpClient { get; }
@@ -89,7 +100,9 @@ protected HttpRequestMessage CreateHttpRequest(TRequest exportRequest)
     protected HttpResponseMessage SendHttpRequest(HttpRequestMessage request, CancellationToken cancellationToken)
     {
 #if NET
-        return this.HttpClient.Send(request, cancellationToken);
+        return this.synchronousSendSupportedByCurrentPlatform
+        ? this.HttpClient.Send(request, cancellationToken)
+        : this.HttpClient.SendAsync(request, cancellationToken).GetAwaiter().GetResult();
 #else
         return this.HttpClient.SendAsync(request, cancellationToken).GetAwaiter().GetResult();
 #endif

src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md

@@ -10,6 +10,10 @@ Notes](../../RELEASENOTES.md).
   `Convert.ToString` will now format using `CultureInfo.InvariantCulture`.
   ([#5700](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5700))
 
+* Fixed `PlatformNotSupportedException`s being thrown during export when running
+  on mobile platforms which caused telemetry to be dropped silently.
+ ([#5821](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/5821))
+
 ## 1.9.0
 
 Released 2024-Jun-14

src/OpenTelemetry.Exporter.Zipkin/ZipkinExporter.cs

@@ -24,6 +24,9 @@ public class ZipkinExporter : BaseExporter<Activity>
     private readonly ZipkinExporterOptions options;
     private readonly int maxPayloadSizeInBytes;
     private readonly HttpClient httpClient;
+#if NET
+    private readonly bool synchronousSendSupportedByCurrentPlatform;
+#endif
 
     /// <summary>
     /// Initializes a new instance of the <see cref="ZipkinExporter"/> class.
@@ -35,8 +38,18 @@ public ZipkinExporter(ZipkinExporterOptions options, HttpClient? client = null)
         Guard.ThrowIfNull(options);
 
         this.options = options;
-        this.maxPayloadSizeInBytes = (!options.MaxPayloadSizeInBytes.HasValue || options.MaxPayloadSizeInBytes <= 0) ? ZipkinExporterOptions.DefaultMaxPayloadSizeInBytes : options.MaxPayloadSizeInBytes.Value;
+        this.maxPayloadSizeInBytes = (!options.MaxPayloadSizeInBytes.HasValue || options.MaxPayloadSizeInBytes <= 0)
+            ? ZipkinExporterOptions.DefaultMaxPayloadSizeInBytes
+            : options.MaxPayloadSizeInBytes.Value;
         this.httpClient = client ?? options.HttpClientFactory?.Invoke() ?? throw new InvalidOperationException("ZipkinExporter was missing HttpClientFactory or it returned null.");
+
+#if NET
+        // See: https://github.com/dotnet/runtime/blob/280f2a0c60ce0378b8db49adc0eecc463d00fe5d/src/libraries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.cs#L767
+        this.synchronousSendSupportedByCurrentPlatform = !OperatingSystem.IsAndroid()
+            && !OperatingSystem.IsIOS()
+            && !OperatingSystem.IsTvOS()
+            && !OperatingSystem.IsBrowser();
+#endif
     }
 
     internal ZipkinEndpoint? LocalEndpoint { get; private set; }
@@ -62,7 +75,9 @@ public override ExportResult Export(in Batch<Activity> batch)
             };
 
 #if NET
-            using var response = this.httpClient.Send(request, CancellationToken.None);
+            using var response = this.synchronousSendSupportedByCurrentPlatform
+            ? this.httpClient.Send(request, CancellationToken.None)
+            : this.httpClient.SendAsync(request, CancellationToken.None).GetAwaiter().GetResult();
 #else
             using var response = this.httpClient.SendAsync(request, CancellationToken.None).GetAwaiter().GetResult();
 #endif