Declarative configuration missing pieces

sdk-extensions/autoconfigure-spi/src/main/java/io/opentelemetry/sdk/autoconfigure/spi/internal/ComponentProvider.java

@@ -5,19 +5,29 @@
 
 package io.opentelemetry.sdk.autoconfigure.spi.internal;
 
+import io.opentelemetry.context.propagation.TextMapPropagator;
+import io.opentelemetry.sdk.logs.LogRecordProcessor;
 import io.opentelemetry.sdk.logs.export.LogRecordExporter;
 import io.opentelemetry.sdk.metrics.export.MetricExporter;
+import io.opentelemetry.sdk.resources.Resource;
+import io.opentelemetry.sdk.trace.SpanProcessor;
 import io.opentelemetry.sdk.trace.export.SpanExporter;
+import io.opentelemetry.sdk.trace.samplers.Sampler;
 
 /**
  * Provides configured instances of SDK extension components. {@link ComponentProvider} allows SDK
  * extension components which are not part of the core SDK to be referenced in file based
  * configuration.
  *
+ * <p>NOTE: when {@link #getType()} is {@link Resource}, the {@link #getName()} is not (currently)
+ * used, and {@link #create(StructuredConfigProperties)} is (currently) called with an empty {@link
+ * StructuredConfigProperties}.
+ *
  * @param <T> the type of the SDK extension component. See {@link #getType()}. Supported values
- *     include: {@link SpanExporter}, {@link MetricExporter}, {@link LogRecordExporter}.
+ *     include: {@link SpanExporter}, {@link MetricExporter}, {@link LogRecordExporter}, {@link
+ *     SpanProcessor}, {@link LogRecordProcessor}, {@link TextMapPropagator}, {@link Sampler},
+ *     {@link Resource}.
  */
-// TODO: add support for Sampler, LogRecordProcessor, SpanProcessor, MetricReader
 public interface ComponentProvider<T> {
 
   /**
@@ -31,7 +41,8 @@ public interface ComponentProvider<T> {
    * instances of a custom span exporter for the "acme" protocol, the name might be "acme".
    *
    * <p>This name MUST not be the same as any other component provider name which returns components
-   * of the same {@link #getType() type}.
+   * of the same {@link #getType() type}. In other words, {@link #getType()} and name form a
+   * composite key uniquely identifying the provider.
    */
   String getName();
 

sdk-extensions/incubator/build.gradle.kts

@@ -26,6 +26,7 @@ dependencies {
 
   // io.opentelemetry.sdk.extension.incubator.fileconfig
   implementation("com.fasterxml.jackson.core:jackson-databind")
+  api("com.fasterxml.jackson.core:jackson-annotations")
   implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml")
   implementation(project(":sdk-extensions:autoconfigure"))
 

sdk-extensions/incubator/src/main/java/io/opentelemetry/sdk/extension/incubator/fileconfig/FileConfiguration.java

@@ -123,8 +123,7 @@ static Object loadYaml(InputStream inputStream, Map<String, String> environmentV
   }
 
   /**
-   * Convert the {@code model} to a generic {@link StructuredConfigProperties}, which can be used to
-   * read configuration not part of the model.
+   * Convert the {@code model} to a generic {@link StructuredConfigProperties}.
    *
    * @param model the configuration model
    * @return a generic {@link StructuredConfigProperties} representation of the model
@@ -133,6 +132,17 @@ public static StructuredConfigProperties toConfigProperties(OpenTelemetryConfigu
     return toConfigProperties((Object) model);
   }
 
+  /**
+   * Convert the {@code configuration} YAML to a generic {@link StructuredConfigProperties}.
+   *
+   * @param configuration configuration YAML
+   * @return a generic {@link StructuredConfigProperties} representation of the model
+   */
+  public static StructuredConfigProperties toConfigProperties(InputStream configuration) {
+    Object yamlObj = loadYaml(configuration, System.getenv());
+    return toConfigProperties(yamlObj);
+  }
+
   static StructuredConfigProperties toConfigProperties(Object model) {
     Map<String, Object> configurationMap =
         MAPPER.convertValue(model, new TypeReference<Map<String, Object>>() {});

sdk-extensions/incubator/src/main/java/io/opentelemetry/sdk/extension/incubator/fileconfig/YamlStructuredConfigProperties.java

@@ -64,7 +64,7 @@ static YamlStructuredConfigProperties create(Map<String, Object> properties) {
     for (Map.Entry<String, Object> entry : properties.entrySet()) {
       String key = entry.getKey();
       Object value = entry.getValue();
-      if (isPrimitive(value)) {
+      if (isPrimitive(value) || value == null) {
         simpleEntries.put(key, value);
         continue;
       }
@@ -283,7 +283,7 @@ public String toString() {
   }
 
   /** Return a map representation of the data. */
-  Map<String, Object> toMap() {
+  public Map<String, Object> toMap() {
     Map<String, Object> result = new HashMap<>(simpleEntries);
     listEntries.forEach(
         (key, value) ->

sdk-extensions/incubator/src/test/java/io/opentelemetry/sdk/extension/incubator/fileconfig/YamlStructuredConfigPropertiesTest.java

@@ -33,6 +33,7 @@ class YamlStructuredConfigPropertiesTest {
           + "  int_key: 1\n"
           + "  float_key: 1.1\n"
           + "  bool_key: true\n"
+          + "  null_key:\n"
           + "  str_list_key: [val1, val2]\n"
           + "  int_list_key: [1, 2]\n"
           + "  float_list_key: [1.1, 2.2]\n"
@@ -90,6 +91,7 @@ void additionalProperties() {
                 "int_key",
                 "float_key",
                 "bool_key",
+                "null_key",
                 "str_list_key",
                 "int_list_key",
                 "float_list_key",
@@ -101,7 +103,10 @@ void additionalProperties() {
     assertThat(otherProps.getInt("int_key")).isEqualTo(1);
     assertThat(otherProps.getLong("int_key")).isEqualTo(1);
     assertThat(otherProps.getDouble("float_key")).isEqualTo(1.1);
-    assertThat(otherProps.getBoolean("bool_key")).isTrue();
+    assertThat(otherProps.getString("null_key")).isNull();
+    assertThat(otherProps.getInt("null_key")).isNull();
+    assertThat(otherProps.getLong("null_key")).isNull();
+    assertThat(otherProps.getBoolean("null_key")).isNull();
     assertThat(otherProps.getScalarList("str_list_key", String.class))
         .isEqualTo(Arrays.asList("val1", "val2"));
     assertThat(otherProps.getScalarList("int_list_key", Long.class))