Print config when loaded (#127)

Signed-off-by: Pavol Loffay <[email protected]>

Author: pavolloffay

javaagent-core/build.gradle.kts

@@ -23,6 +23,7 @@ idea {
 
 dependencies {
     api("io.opentelemetry:opentelemetry-api:0.10.0")
+    implementation("org.slf4j:slf4j-api:1.7.30")
 
     api("com.google.protobuf:protobuf-java:3.11.4")
     api("com.google.protobuf:protobuf-java-util:3.11.4")

javaagent-core/src/main/java/org/hypertrace/agent/core/EnvironmentConfig.java

@@ -36,7 +36,7 @@ private EnvironmentConfig() {}
   public static final String CONFIG_FILE_PROPERTY = HT_PREFIX + "config.file";
   static final String SERVICE_NAME = HT_PREFIX + "service.name";
 
-  static final String PROPAGATION_FORMATS = HT_PREFIX + "propagation_formats";
+  static final String PROPAGATION_FORMATS = HT_PREFIX + "propagation.formats";
 
   private static final String REPORTING_PREFIX = HT_PREFIX + "reporting.";
   static final String REPORTING_ADDRESS = REPORTING_PREFIX + "address";

javaagent-core/src/main/java/org/hypertrace/agent/core/HypertraceConfig.java

@@ -37,12 +37,16 @@
 import org.hypertrace.agent.config.Config.Opa.Builder;
 import org.hypertrace.agent.config.Config.PropagationFormat;
 import org.hypertrace.agent.config.Config.Reporting;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /** {@link HypertraceConfig} loads a yaml config from file. */
 public class HypertraceConfig {
 
   private HypertraceConfig() {}
 
+  private static final Logger log = LoggerFactory.getLogger(HypertraceConfig.class);
+
   private static AgentConfig agentConfig;
 
   static final String DEFAULT_SERVICE_NAME = "unknown";
@@ -56,6 +60,9 @@ public static AgentConfig get() {
         if (agentConfig == null) {
           try {
             agentConfig = load();
+            log.info(
+                "Config loaded: {}",
+                JsonFormat.printer().omittingInsignificantWhitespace().print(agentConfig));
           } catch (IOException e) {
             throw new RuntimeException("Could not load config", e);
           }
@@ -82,6 +89,7 @@ public static boolean isInstrumentationEnabled(String[] instrumentationNames) {
   }
 
   /** Reset the config, use only in tests. */
+  @VisibleForTesting
   public static void reset() {
     agentConfig = null;
   }