Adds version to otel tracer instrumentation scope (#5336)

* Adds version to otel tracer instrumentation scope

* spotless

* while I'm here

* fix tests

* spotless

* use version properties

opencensus-shim/src/main/java/io/opentelemetry/opencensusshim/OpenTelemetrySpanBuilderImpl.java

@@ -44,12 +44,15 @@ import io.opentelemetry.context.Context;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Properties;
 import java.util.Random;
 import javax.annotation.Nullable;
 
 class OpenTelemetrySpanBuilderImpl extends SpanBuilder {
+
+  private static final String OPENCENSUSSHIM_VERSION = readVersion();
   private static final Tracer OTEL_TRACER =
-      GlobalOpenTelemetry.getTracer("io.opentelemetry.opencensusshim");
+      GlobalOpenTelemetry.getTracer("io.opentelemetry.opencensusshim", OPENCENSUSSHIM_VERSION);
   private static final Tracestate OC_TRACESTATE_DEFAULT = Tracestate.builder().build();
   private static final TraceOptions OC_SAMPLED_TRACE_OPTIONS =
       TraceOptions.builder().setIsSampled(true).build();
@@ -209,6 +212,20 @@ class OpenTelemetrySpanBuilderImpl extends SpanBuilder {
     return false;
   }
 
+  private static String readVersion() {
+    Properties properties = new Properties();
+    String version;
+    try {
+      properties.load(
+          OpenTelemetrySpanBuilderImpl.class.getResourceAsStream(
+              "/io/opentelemetry/opencensusshim/version.properties"));
+      version = properties.getProperty("sdk.version", "unknown");
+    } catch (Exception e) {
+      version = "unknown";
+    }
+    return version;
+  }
+
   static final class Options {
     private final RandomHandler randomHandler;
     private final TraceConfig traceConfig;

opentracing-shim/src/main/java/io/opentelemetry/opentracingshim/TracerShim.java

@@ -18,6 +18,7 @@ import io.opentracing.propagation.TextMapInject;
 import java.io.Closeable;
 import java.io.IOException;
 import java.lang.reflect.Field;
+import java.util.Properties;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -26,6 +27,8 @@ import javax.annotation.Nullable;
 final class TracerShim implements Tracer {
   private static final Logger logger = Logger.getLogger(TracerShim.class.getName());
 
+  static final String OPENTRACINGSHIM_VERSION = readVersion();
+
   private final io.opentelemetry.api.trace.TracerProvider provider;
   private final io.opentelemetry.api.trace.Tracer tracer;
   private final ScopeManager scopeManagerShim;
@@ -37,7 +40,7 @@ final class TracerShim implements Tracer {
       TextMapPropagator textMapPropagator,
       TextMapPropagator httpPropagator) {
     this.provider = provider;
-    this.tracer = provider.get("opentracing-shim");
+    this.tracer = provider.get("opentracing-shim", OPENTRACINGSHIM_VERSION);
     this.propagation = new Propagation(textMapPropagator, httpPropagator);
     this.scopeManagerShim = new ScopeManagerShim();
   }
@@ -147,4 +150,18 @@ final class TracerShim implements Tracer {
     }
     return tracerProvider;
   }
+
+  private static String readVersion() {
+    Properties properties = new Properties();
+    String version;
+    try {
+      properties.load(
+          TracerShim.class.getResourceAsStream(
+              "/io/opentelemetry/opentracingshim/version.properties"));
+      version = properties.getProperty("sdk.version", "unknown");
+    } catch (Exception e) {
+      version = "unknown";
+    }
+    return version;
+  }
 }

opentracing-shim/src/test/java/io/opentelemetry/opentracingshim/OpenTracingShimTest.java

@@ -41,7 +41,8 @@ class OpenTracingShimTest {
         .isSameAs(textMapPropagator);
     assertThat(tracerShim.propagation().getPropagator(Format.Builtin.HTTP_HEADERS))
         .isSameAs(textMapPropagator);
-    assertThat(tracerShim.tracer()).isEqualTo(sdk.get("opentracing-shim"));
+    assertThat(tracerShim.tracer())
+        .isEqualTo(sdk.get("opentracing-shim", TracerShim.OPENTRACINGSHIM_VERSION));
   }
 
   @Test
@@ -75,6 +76,7 @@ class OpenTracingShimTest {
         .isSameAs(textMapPropagator);
     assertThat(tracerShim.propagation().getPropagator(Format.Builtin.HTTP_HEADERS))
         .isSameAs(httpHeadersPropagator);
-    assertThat(tracerShim.tracer()).isSameAs(sdk.get("opentracing-shim"));
+    assertThat(tracerShim.tracer())
+        .isSameAs(sdk.get("opentracing-shim", TracerShim.OPENTRACINGSHIM_VERSION));
   }
 }