Improve Application Insights exporter (#82)

* doesn't compile

* One test is passing now

* Generalize test a bit more

* more fixes

* more failing tests

* few more tests

* make tests pass. More testsneeds to be uncommented

* few more tests uncommented

* implemented links and one more unit test

* attributes on links

* annotations support

* mark checks that doesn't match ones in Local Forwarder

* message events

* safely add properties

* fix build

* update changelog

* remove thread sleep for reliability and perf

Author: SergeyKanzhelev

CHANGELOG.md

@@ -7,6 +7,8 @@ the release.
 
 ## Unreleased
 
+- Application Insights exporter improvements - now understands http attributes
+  and process links, annotations and messages.
 - ASP.NET Core collector now uses `http.route` for the span name.
 
 ## 0.1.0-alpha-33381

OpenCensus.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27703.2042
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28407.52
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenCensus", "src\OpenCensus\OpenCensus.csproj", "{AE3E3DF5-4083-4C6E-A840-8271B0ACDE7E}"
 EndProject
@@ -61,6 +61,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenCensus.Exporter.Ocagent
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenCensus.Exporter.Stackdriver.Tests", "test\OpenCensus.Exporter.Stackdriver.Tests\OpenCensus.Exporter.Stackdriver.Tests.csproj", "{6875032B-DFDC-4CDE-A283-37CA7F99926A}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenCensus.Exporter.ApplicationInsights.Tests", "test\OpenCensus.Exporter.ApplicationInsights.Tests\OpenCensus.Exporter.ApplicationInsights.Tests.csproj", "{1FA1F509-7722-48E3-9A35-16CBB6774957}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -127,6 +129,10 @@ Global
 		{6875032B-DFDC-4CDE-A283-37CA7F99926A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6875032B-DFDC-4CDE-A283-37CA7F99926A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{6875032B-DFDC-4CDE-A283-37CA7F99926A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1FA1F509-7722-48E3-9A35-16CBB6774957}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1FA1F509-7722-48E3-9A35-16CBB6774957}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1FA1F509-7722-48E3-9A35-16CBB6774957}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1FA1F509-7722-48E3-9A35-16CBB6774957}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/OpenCensus.Abstractions/Trace/IMessageEvent.cs

@@ -17,7 +17,7 @@
 namespace OpenCensus.Trace
 {
     /// <summary>
-    /// Message event happoened during the span execution.
+    /// Message event happened during the span execution.
     /// </summary>
     public interface IMessageEvent
     {

src/OpenCensus.Abstractions/Trace/LinkType.cs

@@ -22,13 +22,18 @@ namespace OpenCensus.Trace
     public enum LinkType
     {
         /// <summary>
-        /// Child link.
+        /// The relationship of the two spans is unknown, or known but other than parent-child.
         /// </summary>
-        ChildLinkedSpan,
+        Unspecified = 0,
 
         /// <summary>
-        /// Parent link.
+        /// The linked span is a child of the current span.
         /// </summary>
-        ParentLinkedSpan,
+        ChildLinkedSpan = 1,
+
+        /// <summary>
+        /// The linked span is a parent of the current span.
+        /// </summary>
+        ParentLinkedSpan = 2,
     }
 }

src/OpenCensus.Abstractions/Trace/MessageEventType.cs

@@ -21,14 +21,19 @@ namespace OpenCensus.Trace
     /// </summary>
     public enum MessageEventType
     {
+        /// <summary>
+        /// Unknown event type.
+        /// </summary>
+        Unspecified = 0,
+
         /// <summary>
         /// Represent message that was sent from client.
         /// </summary>
-        Sent,
+        Sent = 1,
 
         /// <summary>
         /// Represents message that was recieved by the client.
         /// </summary>
-        Recieved,
+        Received = 2,
     }
 }

src/OpenCensus.Abstractions/Trace/SpanKind.cs

@@ -21,14 +21,19 @@ namespace OpenCensus.Trace
     /// </summary>
     public enum SpanKind
     {
+        /// <summary>
+        /// Span kind was not specified.
+        /// </summary>
+        Unspecified = 0,
+
         /// <summary>
         /// Server span represents request incoming from external component.
         /// </summary>
-        Server,
+        Server = 1,
 
         /// <summary>
         /// Client span represents outgoing request to the external component.
         /// </summary>
-        Client,
+        Client = 2,
     }
 }