Merge branch 'main' into users/dulikvor/markinstrumentation

Author: cijothomas

THIRD-PARTY-NOTICES.TXT

@@ -29,3 +29,20 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+License notice for gRPC for .NET (https://github.com/grpc/grpc-dotnet)
+----------------------------------------------------------------------------------------------
+
+Copyright 2019 The gRPC Authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExportClient/Grpc/GrpcProtocolHelpers.cs

@@ -0,0 +1,144 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Copyright 2019 The gRPC Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System.Diagnostics.CodeAnalysis;
+#if NET462
+using System.Net.Http;
+#endif
+using System.Net.Http.Headers;
+
+namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ExportClient.Grpc;
+
+internal static class GrpcProtocolHelpers
+{
+    internal const string StatusTrailer = "grpc-status";
+    internal const string MessageTrailer = "grpc-message";
+    internal const string CancelledDetail = "No grpc-status found on response.";
+
+    public static Status? GetResponseStatus(HttpHeaders trailingHeaders, HttpResponseMessage httpResponse)
+    {
+        Status? status;
+        try
+        {
+            var result = trailingHeaders.Any() ? TryGetStatusCore(trailingHeaders, out status) : TryGetStatusCore(httpResponse.Headers, out status);
+
+            if (!result)
+            {
+                status = new Status(StatusCode.Cancelled, CancelledDetail);
+            }
+        }
+        catch (Exception ex)
+        {
+            // Handle error from parsing badly formed status
+            status = new Status(StatusCode.Cancelled, ex.Message, ex);
+        }
+
+        return status;
+    }
+
+    public static bool TryGetStatusCore(HttpHeaders headers, [NotNullWhen(true)] out Status? status)
+    {
+        var grpcStatus = GetHeaderValue(headers, StatusTrailer);
+
+        // grpc-status is a required trailer
+        if (grpcStatus == null)
+        {
+            status = null;
+            return false;
+        }
+
+        int statusValue;
+        if (!int.TryParse(grpcStatus, out statusValue))
+        {
+            throw new InvalidOperationException("Unexpected grpc-status value: " + grpcStatus);
+        }
+
+        // grpc-message is optional
+        // Always read the gRPC message from the same headers collection as the status
+        var grpcMessage = GetHeaderValue(headers, MessageTrailer);
+
+        if (!string.IsNullOrEmpty(grpcMessage))
+        {
+            // https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#responses
+            // The value portion of Status-Message is conceptually a Unicode string description of the error,
+            // physically encoded as UTF-8 followed by percent-encoding.
+            grpcMessage = Uri.UnescapeDataString(grpcMessage);
+        }
+
+        status = new Status((StatusCode)statusValue, grpcMessage ?? string.Empty);
+        return true;
+    }
+
+    public static string? GetHeaderValue(HttpHeaders? headers, string name, bool first = false)
+    {
+        if (headers == null)
+        {
+            return null;
+        }
+
+#if NET6_0_OR_GREATER
+        if (!headers.NonValidated.TryGetValues(name, out var values))
+        {
+            return null;
+        }
+
+        using (var e = values.GetEnumerator())
+        {
+            if (!e.MoveNext())
+            {
+                return null;
+            }
+
+            var result = e.Current;
+            if (!e.MoveNext())
+            {
+                return result;
+            }
+
+            if (first)
+            {
+                return result;
+            }
+        }
+
+        throw new InvalidOperationException($"Multiple {name} headers.");
+#else
+        if (!headers.TryGetValues(name, out var values))
+        {
+            return null;
+        }
+
+        // HttpHeaders appears to always return an array, but fallback to converting values to one just in case
+        var valuesArray = values as string[] ?? values.ToArray();
+
+        switch (valuesArray.Length)
+        {
+            case 0:
+                return null;
+            case 1:
+                return valuesArray[0];
+            default:
+                if (first)
+                {
+                    return valuesArray[0];
+                }
+
+                throw new InvalidOperationException($"Multiple {name} headers.");
+        }
+#endif
+    }
+}