declarative config: support Span stacktrace (#2262)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>
Co-authored-by: Pranav Sharma <pranav.ps95@hotmail.com>

Author: 3 people

span-stacktrace/README.md

@@ -1,4 +1,3 @@
-
 # Span stacktrace capture
 
 This module provides a `SpanProcessor` that captures the [`code.stacktrace`](https://opentelemetry.io/docs/specs/semconv/attributes-registry/code/).
@@ -25,6 +24,21 @@ SDK when included in the application runtime dependencies.
 - value is the class name of a class implementing `java.util.function.Predicate<ReadableSpan>`
 - filter class must be publicly accessible and provide a no-arg constructor
 
+### Usage with declarative configuration
+
+You can enable the stacktrace span processor using declarative YAML configuration with the OpenTelemetry SDK. For example:
+
+```yaml
+file_format: 1.0-rc.1
+tracer_provider:
+  processors:
+    - experimental_stacktrace:
+        min_duration: 10 # minimal duration in ms, default is 5, MUST be an integer
+        filter: my.class.Name # optional, default is to include all spans
+```
+
+This configuration will register the StackTraceSpanProcessor for all spans.
+
 ## Component owners
 
 - [Jack Shirazi](https://github.com/jackshirazi), Elastic

span-stacktrace/build.gradle.kts

@@ -15,8 +15,13 @@ dependencies {
 
   compileOnly("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure")
   compileOnly("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure-spi")
+  compileOnly("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure")
+  compileOnly("io.opentelemetry:opentelemetry-sdk-extension-incubator")
+  compileOnly("io.opentelemetry.instrumentation:opentelemetry-declarative-config-bridge")
   testImplementation("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure")
   testImplementation("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure-spi")
+  testImplementation("io.opentelemetry:opentelemetry-sdk-extension-incubator")
+  testImplementation("io.opentelemetry.instrumentation:opentelemetry-declarative-config-bridge")
 
   compileOnly("io.opentelemetry.semconv:opentelemetry-semconv")
   testImplementation("io.opentelemetry.semconv:opentelemetry-semconv")

span-stacktrace/src/main/java/io/opentelemetry/contrib/stacktrace/StackTraceAutoConfig.java

@@ -26,25 +26,26 @@ public class StackTraceAutoConfig implements AutoConfigurationCustomizerProvider
 
   private static final Logger log = Logger.getLogger(StackTraceAutoConfig.class.getName());
 
-  private static final String CONFIG_MIN_DURATION =
-      "otel.java.experimental.span-stacktrace.min.duration";
+  static final String PREFIX = "otel.java.experimental.span-stacktrace.";
+  static final String CONFIG_MIN_DURATION = PREFIX + "min.duration";
   private static final Duration CONFIG_MIN_DURATION_DEFAULT = Duration.ofMillis(5);
-
-  private static final String CONFIG_FILTER = "otel.java.experimental.span-stacktrace.filter";
+  private static final String CONFIG_FILTER = PREFIX + "filter";
 
   @Override
   public void customize(AutoConfigurationCustomizer config) {
     config.addTracerProviderCustomizer(
         (providerBuilder, properties) -> {
-          long minDuration = getMinDuration(properties);
-          if (minDuration >= 0) {
-            Predicate<ReadableSpan> filter = getFilterPredicate(properties);
-            providerBuilder.addSpanProcessor(new StackTraceSpanProcessor(minDuration, filter));
+          if (getMinDuration(properties) >= 0) {
+            providerBuilder.addSpanProcessor(create(properties));
           }
           return providerBuilder;
         });
   }
 
+  static StackTraceSpanProcessor create(ConfigProperties properties) {
+    return new StackTraceSpanProcessor(getMinDuration(properties), getFilterPredicate(properties));
+  }
+
   // package-private for testing
   static long getMinDuration(ConfigProperties properties) {
     long minDuration =

span-stacktrace/src/main/java/io/opentelemetry/contrib/stacktrace/StackTraceComponentProvider.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.contrib.stacktrace;
+
+import com.google.auto.service.AutoService;
+import io.opentelemetry.api.incubator.config.DeclarativeConfigProperties;
+import io.opentelemetry.instrumentation.config.bridge.DeclarativeConfigPropertiesBridgeBuilder;
+import io.opentelemetry.sdk.autoconfigure.spi.internal.ComponentProvider;
+import io.opentelemetry.sdk.trace.SpanProcessor;
+
+@SuppressWarnings("rawtypes")
+@AutoService(ComponentProvider.class)
+public class StackTraceComponentProvider implements ComponentProvider<SpanProcessor> {
+  @Override
+  public String getName() {
+    return "experimental_stacktrace";
+  }
+
+  @Override
+  public SpanProcessor create(DeclarativeConfigProperties config) {
+    return StackTraceAutoConfig.create(
+        new DeclarativeConfigPropertiesBridgeBuilder()
+            .addMapping(StackTraceAutoConfig.CONFIG_MIN_DURATION, "min_duration")
+            .addMapping(StackTraceAutoConfig.PREFIX, "")
+            .build(config));
+  }
+
+  @Override
+  public Class<SpanProcessor> getType() {
+    return SpanProcessor.class;
+  }
+}

span-stacktrace/src/main/java/io/opentelemetry/contrib/stacktrace/StackTraceSpanProcessor.java

@@ -94,4 +94,14 @@ private static String removeInternalFrames(String stackTrace) {
     }
     return stackTrace.substring(nextNewLine + 1);
   }
+
+  @Override
+  public String toString() {
+    return "StackTraceSpanProcessor{"
+        + "minSpanDurationNanos="
+        + minSpanDurationNanos
+        + ", filterPredicate="
+        + filterPredicate
+        + '}';
+  }
 }

span-stacktrace/src/test/java/io/opentelemetry/contrib/stacktrace/StackTraceComponentProviderTest.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.contrib.stacktrace;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.opentelemetry.sdk.OpenTelemetrySdk;
+import io.opentelemetry.sdk.extension.incubator.fileconfig.DeclarativeConfiguration;
+import java.io.ByteArrayInputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.Locale;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+
+class StackTraceComponentProviderTest {
+  @Test
+  void endToEnd() {
+    String yaml =
+        "file_format: 1.0-rc.1\n"
+            + "tracer_provider:\n"
+            + "  processors:\n"
+            + "    - experimental_stacktrace: \n"
+            + "        min_duration: 100\n"
+            + "        filter: io.opentelemetry.contrib.stacktrace.StackTraceSpanProcessorTest$YesPredicate\n";
+
+    OpenTelemetrySdk openTelemetrySdk =
+        DeclarativeConfiguration.parseAndCreate(
+            new ByteArrayInputStream(yaml.getBytes(StandardCharsets.UTF_8)));
+
+    assertThat(openTelemetrySdk.getSdkTracerProvider().toString())
+        .contains(
+            String.format(
+                Locale.ROOT,
+                "StackTraceSpanProcessor{minSpanDurationNanos=%d, "
+                    + "filterPredicate=io.opentelemetry.contrib.stacktrace.StackTraceSpanProcessorTest$YesPredicate",
+                TimeUnit.MILLISECONDS.toNanos(100)));
+  }
+}