Move W3C classes to base SDK so everyone can use them (#1138)

* Move W3C classes to base and deprecate them in DependencyCollector

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Version 2.9.0
 - [Fix: remove unused reference to Microsoft.AspNet.TelemetryCorrelation package from DependencyCollector](https://github.com/Microsoft/ApplicationInsights-dotnet-server/pull/1136)
+- [Move W3C support from DependencyCollector package to base SDK, deprecate W3C support in DependencyCollector](https://github.com/Microsoft/ApplicationInsights-dotnet-server/pull/1138)
 
 ## Version 2.9.0-beta3
 - Update Base SDK to version 2.9.0-beta3

Src/Common/StringUtilities.cs

@@ -7,8 +7,9 @@ namespace Microsoft.ApplicationInsights.Common.Internal
     using System;
     using System.Diagnostics;
     using System.Globalization;
+    using Microsoft.ApplicationInsights.Extensibility.W3C;
 #if DEPENDENCY_COLLECTOR
-    using Microsoft.ApplicationInsights.W3C;        
+    using Microsoft.ApplicationInsights.W3C;
 #else
     using Microsoft.ApplicationInsights.W3C.Internal;
 #endif
@@ -17,14 +18,12 @@ namespace Microsoft.ApplicationInsights.Common.Internal
     /// Generic functions to perform common operations on a string.
     /// </summary>
 #if DEPENDENCY_COLLECTOR
-    public 
+    public
 #else
     internal
 #endif
     static class StringUtilities
     {
-        private static readonly uint[] Lookup32 = CreateLookup32();
-
         /// <summary>
         /// Check a strings length and trim to a max length if needed.
         /// </summary>
@@ -47,19 +46,21 @@ public static string EnforceMaxLength(string input, int maxLength)
         /// https://github.com/w3c/distributed-tracing/blob/master/trace_context/HTTP_HEADER_FORMAT.md#trace-id
         /// </summary>
         /// <returns>Random 16 bytes array encoded as hex string</returns>
+        [Obsolete("Use Microsoft.ApplicationInsights.Extensibility.W3C.W3CUtilities.GenerateTraceId in Microsoft.ApplicationInsights package instead.")]
         public static string GenerateTraceId()
         {
-            return GenerateId(Guid.NewGuid().ToByteArray(), 0, 16);
+            return W3CUtilities.GenerateTraceId();
         }
 
         /// <summary>
         /// Generates random span Id as per W3C Distributed tracing specification.
         /// https://github.com/w3c/distributed-tracing/blob/master/trace_context/HTTP_HEADER_FORMAT.md#span-id
         /// </summary>
         /// <returns>Random 8 bytes array encoded as hex string</returns>
+        [Obsolete("Use Microsoft.ApplicationInsights.Extensibility.W3C.W3CUtilities.GenerateTraceId in Microsoft.ApplicationInsights package instead.")]
         public static string GenerateSpanId()
         {
-            return GenerateId(Guid.NewGuid().ToByteArray(), 0, 8);
+            return W3CUtilities.GenerateTraceId().Substring(0, 16);
         }
 
         /// <summary>
@@ -68,65 +69,15 @@ public static string GenerateSpanId()
         /// <param name="traceId">Trace Id.</param>
         /// <param name="spanId">Span id.</param>
         /// <returns>valid Request-Id.</returns>
+        [Obsolete("Obsolete, implement yourself with 'string.Concat(\"|\", traceId, \".\", spanId, \".\").'")]
         public static string FormatRequestId(string traceId, string spanId)
         {
-            return String.Concat("|", traceId, ".", spanId, ".");
-        }
-
-        /// <summary>
-        /// Gets root id (string between '|' and the first dot) from the hierarchical Id.
-        /// </summary>
-        /// <param name="hierarchicalId">Id to extract root from.</param>
-        /// <returns>Root operation id.</returns>
-        internal static string GetRootId(string hierarchicalId)
-        {
-            // Returns the root Id from the '|' to the first '.' if any.
-            int rootEnd = hierarchicalId.IndexOf('.');
-            if (rootEnd < 0)
-            {
-                rootEnd = hierarchicalId.Length;
-            }
-
-            int rootStart = hierarchicalId[0] == '|' ? 1 : 0;
-            return hierarchicalId.Substring(rootStart, rootEnd - rootStart);
+            return string.Concat("|", traceId, ".", spanId, ".");
         }
 
-#pragma warning disable 612, 618
         internal static string FormatAzureTracestate(string appId)
         {
-            return String.Concat(W3CConstants.AzureTracestateNamespace, "=", appId);
-        }
-#pragma warning restore 612, 618
-
-        /// <summary>
-        /// Converts byte array to hex lower case string.
-        /// </summary>
-        /// <returns>Array encoded as hex string</returns>
-        private static string GenerateId(byte[] bytes, int start, int length)
-        {
-            // See https://stackoverflow.com/questions/311165/how-do-you-convert-a-byte-array-to-a-hexadecimal-string-and-vice-versa/24343727#24343727
-            var result = new char[length * 2];
-            for (int i = start; i < start + length; i++)
-            {
-                var val = Lookup32[bytes[i]];
-                result[2 * i] = (char)val;
-                result[(2 * i) + 1] = (char)(val >> 16);
-            }
-
-            return new string(result);
-        }
-
-        private static uint[] CreateLookup32()
-        {
-            // See https://stackoverflow.com/questions/311165/how-do-you-convert-a-byte-array-to-a-hexadecimal-string-and-vice-versa/24343727#24343727
-            var result = new uint[256];
-            for (int i = 0; i < 256; i++)
-            {
-                string s = i.ToString("x2", CultureInfo.InvariantCulture);
-                result[i] = ((uint)s[0]) + ((uint)s[1] << 16);
-            }
-
-            return result;
+            return string.Concat(W3CConstants.AzureTracestateNamespace, "=", appId);
         }
     }
 }