RED-9157 - Don't enable tracing if collector endpoint is not resolvable

src/main/java/com/knecon/fforesight/tracing/DefaultTracingAutoConfiguration.java

@@ -1,26 +1,27 @@
 package com.knecon.fforesight.tracing;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.autoconfigure.tracing.ConditionalOnEnabledTracing;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.http.server.observation.ServerRequestObservationContext;
+
 import io.micrometer.context.ContextRegistry;
 import io.micrometer.observation.ObservationPredicate;
 import io.micrometer.tracing.Tracer;
 import io.micrometer.tracing.contextpropagation.ObservationAwareSpanThreadLocalAccessor;
 import jakarta.annotation.PostConstruct;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.actuate.autoconfigure.tracing.ConditionalOnEnabledTracing;
-import org.springframework.boot.autoconfigure.AutoConfiguration;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Import;
-import org.springframework.context.annotation.PropertySource;
-import org.springframework.http.server.observation.ServerRequestObservationContext;
 
 @AutoConfiguration
 @ConditionalOnEnabledTracing
 @Import({
         TaskExecutionConfiguration.class,
         TracingRabbitConfiguration.class,
-        WebMvcConfiguration.class
+        WebMvcConfiguration.class,
+        TracingSafetyCheck.class
 })
 @PropertySource("classpath:tracing-task.properties")
 @Slf4j
@@ -29,12 +30,18 @@ public class DefaultTracingAutoConfiguration {
     @Autowired
     Tracer tracer;
 
+    @Autowired
+    TracingSafetyCheck tracingSafetyCheck;
+
     @PostConstruct
     public void postConstruct() {
 
+        if (tracingSafetyCheck.isEndpointResolvable()) {
             ContextRegistry.getInstance().registerThreadLocalAccessor(new ObservationAwareSpanThreadLocalAccessor(tracer));
-
             log.info("Tracing AutoConfiguration Loaded!");
+        } else {
+            log.info("Hostname is not resolvable, tracing is disabled.");
+        }
     }
 
 

src/main/java/com/knecon/fforesight/tracing/OpenTelemetryConfig.java

@@ -0,0 +1,22 @@
+package com.knecon.fforesight.tracing;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Configuration;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Configuration
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class OpenTelemetryConfig {
+
+    @Value("${management.otlp.tracing.endpoint}")
+    private String otlpEndpoint;
+
+    @Value("${management.tracing.enabled}")
+    private boolean tracingEnabled;
+
+}

src/main/java/com/knecon/fforesight/tracing/TracingSafetyCheck.java

@@ -0,0 +1,45 @@
+package com.knecon.fforesight.tracing;
+
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
+
+@Service
+@Builder
+@Getter
+@Slf4j
+public class TracingSafetyCheck {
+
+    @Autowired
+    private OpenTelemetryConfig openTelemetryConfig;
+
+
+    public boolean isEndpointResolvable() {
+
+        String endpoint = openTelemetryConfig.getOtlpEndpoint();
+        boolean resolvable = endpoint != null && canResolveEndpoint(endpoint);
+        log.info("Endpoint {} is resolvable: {}", endpoint, resolvable);
+        return resolvable;
+    }
+
+
+    private boolean canResolveEndpoint(String endpoint) {
+
+        try {
+            URL url = new URL(endpoint);
+            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+            connection.setRequestMethod("HEAD");
+            int responseCode = connection.getResponseCode();
+            return (200 <= responseCode && responseCode <= 399);
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+}

src/test/java/com/knecon/fforesight/tracing/ObservationEnabledTest.java

@@ -1,8 +1,9 @@
 package com.knecon.fforesight.tracing;
 
-import com.knecon.fforesight.tenantcommons.RabbitTemplateMultiCustomizer;
-import com.knecon.fforesight.tenantcommons.SimpleMessageListenerContainerCustomizer;
-import lombok.extern.slf4j.Slf4j;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.amqp.rabbit.core.RabbitTemplate;
@@ -11,26 +12,29 @@ import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.test.system.CapturedOutput;
 import org.springframework.boot.test.system.OutputCaptureExtension;
 
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.verify;
+import com.knecon.fforesight.tenantcommons.RabbitTemplateMultiCustomizer;
+import com.knecon.fforesight.tenantcommons.SimpleMessageListenerContainerCustomizer;
+
+import lombok.extern.slf4j.Slf4j;
 
 @ExtendWith(OutputCaptureExtension.class)
 @Slf4j
 public class ObservationEnabledTest {
 
+    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner().withPropertyValues("management.tracing.enabled=true")
+            .withPropertyValues("spring.profiles.active=test")
+            .withUserConfiguration(SharedTestConfiguration.class, DefaultTracingAutoConfiguration.class, OpenTelemetryConfig.class);
 
-    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
-            .withPropertyValues("management.tracing.enabled=true")
-            .withUserConfiguration(SharedTestConfiguration.class, DefaultTracingAutoConfiguration.class);
 
     @Test
     public void testTracingAutoConfigurationLoaded(CapturedOutput output) {
+
         this.contextRunner.run(context -> {
             assertThat(output.getOut()).contains("Tracing AutoConfiguration Loaded!");
         });
     }
 
+
     @Test
     public void testRabbitTracingEnabled() {
 

src/test/java/com/knecon/fforesight/tracing/SharedTestConfiguration.java

@@ -1,16 +1,31 @@
 package com.knecon.fforesight.tracing;
 
+import org.mockito.Mockito;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Profile;
+
 import io.micrometer.tracing.Tracer;
 import io.micrometer.tracing.test.simple.SimpleTracer;
-import org.springframework.boot.autoconfigure.AutoConfiguration;
-import org.springframework.context.annotation.Bean;
 
 @AutoConfiguration
+@Profile("test")
 public class SharedTestConfiguration {
 
+
     @Bean
     Tracer simpleTracer() {
+
         return new SimpleTracer();
     }
 
+
+    @Bean
+    public TracingSafetyCheck tracingSafetyCheck() {
+
+        TracingSafetyCheck mock = Mockito.mock(TracingSafetyCheck.class);
+        Mockito.when(mock.isEndpointResolvable()).thenReturn(true);
+        return mock;
+    }
+
 }

src/test/java/com/knecon/fforesight/tracing/TaskExecutionTracingTest.java

@@ -1,11 +1,11 @@
 package com.knecon.fforesight.tracing;
 
-import io.micrometer.observation.Observation;
-import io.micrometer.observation.ObservationRegistry;
-import io.micrometer.tracing.Span;
-import io.micrometer.tracing.Tracer;
-import io.micrometer.tracing.test.simple.SimpleTracer;
-import lombok.extern.slf4j.Slf4j;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
 import org.assertj.core.api.BDDAssertions;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -18,11 +18,12 @@ import org.springframework.boot.test.system.OutputCaptureExtension;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Component;
 
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
-
-import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import io.micrometer.observation.Observation;
+import io.micrometer.observation.ObservationRegistry;
+import io.micrometer.tracing.Span;
+import io.micrometer.tracing.Tracer;
+import io.micrometer.tracing.test.simple.SimpleTracer;
+import lombok.extern.slf4j.Slf4j;
 
 @ExtendWith(OutputCaptureExtension.class)
 @Slf4j
@@ -30,18 +31,20 @@ public class TaskExecutionTracingTest {
 
     private static final String ASYNC_SPAN_NAME = "Async Span";
 
-    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
-            .withPropertyValues("management.tracing.enabled=true")
+    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner().withPropertyValues("management.tracing.enabled=true")
             .withConfiguration(AutoConfigurations.of(TaskExecutionAutoConfiguration.class))
-            .withUserConfiguration(SharedTestConfiguration.class, AsyncLogic.class, DefaultTracingAutoConfiguration.class);
+            .withPropertyValues("spring.profiles.active=test")
+            .withUserConfiguration(SharedTestConfiguration.class, AsyncLogic.class, DefaultTracingAutoConfiguration.class, OpenTelemetryConfig.class);
+
     private final ObservationRegistry observationRegistry = ObservationRegistry.create();
 
 
     @Test
     public void asyncMethodTraceTest(CapturedOutput output) {
+
         this.contextRunner.run(context -> {
-            SimpleTracer tracer = (SimpleTracer)context.getBean(Tracer.class);
-            var asyncLogic = context.getBean(AsyncLogic.class);
+            SimpleTracer tracer = (SimpleTracer) context.getBean(Tracer.class);
+            AsyncLogic asyncLogic = context.getBean(AsyncLogic.class);
 
             Observation firstSpan = Observation.createNotStarted("First span", observationRegistry).highCardinalityKeyValue("test", "test 1");
             try (Observation.Scope scope = firstSpan.start().openScope()) {
@@ -54,18 +57,18 @@ public class TaskExecutionTracingTest {
                     String spanIdFromFuture = future.get(1, TimeUnit.SECONDS);
                     log.info("Async in test with span - after call");
                     BDDAssertions.then(spanIdFromFuture).isEqualTo(secondSpan.context().spanId());
-                }
-                finally {
+                } finally {
                     secondSpan.end();
                 }
 
                 log.info("Async in test with observation - after call");
-            }
-            finally {
+            } finally {
                 firstSpan.stop();
             }
 
-            var tracerSpans = tracer.getSpans().stream().toList();
+            var tracerSpans = tracer.getSpans()
+                    .stream()
+                    .toList();
 
             assertThat(tracerSpans.size()).isEqualTo(2);
             assertThat(tracerSpans.get(1).getName()).isEqualTo(ASYNC_SPAN_NAME);
@@ -73,17 +76,23 @@ public class TaskExecutionTracingTest {
         });
     }
 
+
     @Component
     static class AsyncLogic {
+
         @Autowired
         Tracer tracer;
 
+
         @Async("applicationTaskExecutor")
         public Future<String> asyncCall() {
+
             log.info("TASK EXECUTOR");
             tracer.nextSpan().name(ASYNC_SPAN_NAME).tag("test", "test 3").start().end();
             String spanId = tracer.currentSpan().context().spanId();
             return CompletableFuture.supplyAsync(() -> spanId);
         }
+
     }
+
 }