Add toString to OTLP exporters (#5686)

Co-authored-by: Mateusz Rzeszutek <mrzeszutek@splunk.com>

docs/apidiffs/current_vs_latest/opentelemetry-exporter-otlp.txt

@@ -2,18 +2,24 @@ Comparing source compatibility of  against
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.otlp.http.logs.OtlpHttpLogRecordExporter  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.exporter.otlp.http.logs.OtlpHttpLogRecordExporterBuilder toBuilder()
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.otlp.http.metrics.OtlpHttpMetricExporter  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.exporter.otlp.http.metrics.OtlpHttpMetricExporterBuilder toBuilder()
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.otlp.http.trace.OtlpHttpSpanExporter  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.exporter.otlp.http.trace.OtlpHttpSpanExporterBuilder toBuilder()
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporterBuilder toBuilder()
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporterBuilder toBuilder()
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporterBuilder toBuilder()
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()

exporters/common/src/main/java/io/opentelemetry/exporter/internal/grpc/GrpcExporterBuilder.java

@@ -25,6 +25,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.StringJoiner;
 import java.util.concurrent.TimeUnit;
 import java.util.function.BiFunction;
 import java.util.function.Supplier;
@@ -202,6 +203,36 @@ public class GrpcExporterBuilder<T extends Marshaler> {
         compressionEnabled);
   }
 
+  public String toString(boolean includePrefixAndSuffix) {
+    StringJoiner joiner =
+        includePrefixAndSuffix
+            ? new StringJoiner(", ", "GrpcExporterBuilder{", "}")
+            : new StringJoiner(", ");
+    joiner.add("exporterName=" + exporterName);
+    joiner.add("type=" + type);
+    joiner.add("endpoint=" + endpoint.toString());
+    joiner.add("endpointPath=" + grpcEndpointPath);
+    joiner.add("timeoutNanos=" + timeoutNanos);
+    joiner.add("compressionEnabled=" + compressionEnabled);
+    StringJoiner headersJoiner = new StringJoiner(", ", "Headers{", "}");
+    headers.forEach((key, value) -> headersJoiner.add(key + "=OBFUSCATED"));
+    joiner.add("headers=" + headersJoiner);
+    if (retryPolicy != null) {
+      joiner.add("retryPolicy=" + retryPolicy);
+    }
+    if (grpcChannel != null) {
+      joiner.add("grpcChannel=" + grpcChannel);
+    }
+    // Note: omit tlsConfigHelper because we can't log the configuration in any readable way
+    // Note: omit meterProviderSupplier because we can't log the configuration in any readable way
+    return joiner.toString();
+  }
+
+  @Override
+  public String toString() {
+    return toString(true);
+  }
+
   // Use an inner class to ensure GrpcExporterBuilder does not have classloading dependencies on
   // upstream gRPC.
   private class UpstreamGrpcExporterFactory {

exporters/common/src/main/java/io/opentelemetry/exporter/internal/http/HttpExporterBuilder.java

@@ -19,6 +19,7 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.ServiceLoader;
+import java.util.StringJoiner;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Supplier;
 import java.util.logging.Level;
@@ -166,6 +167,36 @@ public final class HttpExporterBuilder<T extends Marshaler> {
     return new HttpExporter<>(exporterName, type, httpSender, meterProviderSupplier, exportAsJson);
   }
 
+  public String toString(boolean includePrefixAndSuffix) {
+    StringJoiner joiner =
+        includePrefixAndSuffix
+            ? new StringJoiner(", ", "HttpExporterBuilder{", "}")
+            : new StringJoiner(", ");
+    joiner.add("exporterName=" + exporterName);
+    joiner.add("type=" + type);
+    joiner.add("endpoint=" + endpoint);
+    joiner.add("timeoutNanos=" + timeoutNanos);
+    joiner.add("compressionEnabled=" + compressionEnabled);
+    joiner.add("exportAsJson=" + exportAsJson);
+    if (headers != null) {
+      StringJoiner headersJoiner = new StringJoiner(", ", "Headers{", "}");
+      headers.forEach((key, value) -> headersJoiner.add(key + "=OBFUSCATED"));
+      joiner.add("headers=" + headersJoiner);
+    }
+    if (retryPolicy != null) {
+      joiner.add("retryPolicy=" + retryPolicy);
+    }
+    // Note: omit tlsConfigHelper because we can't log the configuration in any readable way
+    // Note: omit meterProviderSupplier because we can't log the configuration in any readable way
+    // Note: omit authenticator because we can't log the configuration in any readable way
+    return joiner.toString();
+  }
+
+  @Override
+  public String toString() {
+    return toString(true);
+  }
+
   /**
    * Resolve the {@link HttpSenderProvider}.
    *

exporters/otlp/all/src/main/java/io/opentelemetry/exporter/otlp/http/logs/OtlpHttpLogRecordExporter.java

@@ -84,4 +84,9 @@ public final class OtlpHttpLogRecordExporter implements LogRecordExporter {
   public CompletableResultCode shutdown() {
     return delegate.shutdown();
   }
+
+  @Override
+  public String toString() {
+    return "OtlpHttpLogRecordExporter{" + builder.toString(false) + "}";
+  }
 }

exporters/otlp/all/src/main/java/io/opentelemetry/exporter/otlp/http/metrics/OtlpHttpMetricExporter.java

@@ -110,4 +110,9 @@ public final class OtlpHttpMetricExporter implements MetricExporter {
   public CompletableResultCode shutdown() {
     return delegate.shutdown();
   }
+
+  @Override
+  public String toString() {
+    return "OtlpHttpMetricExporter{" + builder.toString(false) + "}";
+  }
 }

exporters/otlp/all/src/main/java/io/opentelemetry/exporter/otlp/http/trace/OtlpHttpSpanExporter.java

@@ -89,4 +89,9 @@ public final class OtlpHttpSpanExporter implements SpanExporter {
   public CompletableResultCode shutdown() {
     return delegate.shutdown();
   }
+
+  @Override
+  public String toString() {
+    return "OtlpHttpSpanExporter{" + builder.toString(false) + "}";
+  }
 }

exporters/otlp/all/src/main/java/io/opentelemetry/exporter/otlp/logs/OtlpGrpcLogRecordExporter.java

@@ -87,4 +87,9 @@ public final class OtlpGrpcLogRecordExporter implements LogRecordExporter {
   public CompletableResultCode shutdown() {
     return delegate.shutdown();
   }
+
+  @Override
+  public String toString() {
+    return "OtlpGrpcLogRecordExporter{" + builder.toString(false) + "}";
+  }
 }

exporters/otlp/all/src/main/java/io/opentelemetry/exporter/otlp/metrics/OtlpGrpcMetricExporter.java

@@ -114,4 +114,9 @@ public final class OtlpGrpcMetricExporter implements MetricExporter {
   public CompletableResultCode shutdown() {
     return delegate.shutdown();
   }
+
+  @Override
+  public String toString() {
+    return "OtlpGrpcMetricExporter{" + builder.toString(false) + "}";
+  }
 }

exporters/otlp/all/src/main/java/io/opentelemetry/exporter/otlp/trace/OtlpGrpcSpanExporter.java

@@ -89,4 +89,9 @@ public final class OtlpGrpcSpanExporter implements SpanExporter {
   public CompletableResultCode shutdown() {
     return delegate.shutdown();
   }
+
+  @Override
+  public String toString() {
+    return "OtlpGrpcSpanExporter{" + builder.toString(false) + "}";
+  }
 }

exporters/otlp/testing-internal/src/main/java/io/opentelemetry/exporter/otlp/testing/internal/AbstractGrpcTelemetryExporterTest.java

@@ -783,6 +783,68 @@ public abstract class AbstractGrpcTelemetryExporterTest<T, U extends Message> {
     }
   }
 
+  @Test
+  void stringRepresentation() throws IOException, CertificateEncodingException {
+    TelemetryExporter<T> telemetryExporter =
+        exporterBuilder().setEndpoint("http://localhost:4317").build();
+    try {
+      assertThat(telemetryExporter.unwrap().toString())
+          .matches(
+              "OtlpGrpc[a-zA-Z]*Exporter\\{"
+                  + "exporterName=otlp, "
+                  + "type=[a-zA_Z]*, "
+                  + "endpoint=http://localhost:4317, "
+                  + "endpointPath=.*, "
+                  + "timeoutNanos="
+                  + TimeUnit.SECONDS.toNanos(10)
+                  + ", "
+                  + "compressionEnabled=false, "
+                  + "headers=Headers\\{User-Agent=OBFUSCATED\\}"
+                  + ".*" // Maybe additional grpcChannel field
+                  + "\\}");
+    } finally {
+      telemetryExporter.shutdown();
+    }
+
+    telemetryExporter =
+        exporterBuilder()
+            .setTimeout(Duration.ofSeconds(5))
+            .setEndpoint("http://example:4317")
+            .setCompression("gzip")
+            .addHeader("foo", "bar")
+            .setTrustedCertificates(certificate.certificate().getEncoded())
+            .setClientTls(
+                Files.readAllBytes(clientCertificate.privateKeyFile().toPath()),
+                Files.readAllBytes(clientCertificate.certificateFile().toPath()))
+            .setRetryPolicy(
+                RetryPolicy.builder()
+                    .setMaxAttempts(2)
+                    .setMaxBackoff(Duration.ofSeconds(3))
+                    .setInitialBackoff(Duration.ofMillis(50))
+                    .setBackoffMultiplier(1.3)
+                    .build())
+            .build();
+    try {
+      assertThat(telemetryExporter.unwrap().toString())
+          .matches(
+              "OtlpGrpc[a-zA-Z]*Exporter\\{"
+                  + "exporterName=otlp, "
+                  + "type=[a-zA_Z]*, "
+                  + "endpoint=http://example:4317, "
+                  + "endpointPath=.*, "
+                  + "timeoutNanos="
+                  + TimeUnit.SECONDS.toNanos(5)
+                  + ", "
+                  + "compressionEnabled=true, "
+                  + "headers=Headers\\{.*foo=OBFUSCATED.*\\}, "
+                  + "retryPolicy=RetryPolicy\\{maxAttempts=2, initialBackoff=PT0\\.05S, maxBackoff=PT3S, backoffMultiplier=1\\.3\\}"
+                  + ".*" // Maybe additional grpcChannel field
+                  + "\\}");
+    } finally {
+      telemetryExporter.shutdown();
+    }
+  }
+
   protected abstract TelemetryExporterBuilder<T> exporterBuilder();
 
   protected abstract TelemetryExporterBuilder<T> toBuilder(TelemetryExporter<T> exporter);

exporters/otlp/testing-internal/src/main/java/io/opentelemetry/exporter/otlp/testing/internal/AbstractHttpTelemetryExporterTest.java

@@ -715,6 +715,65 @@ public abstract class AbstractHttpTelemetryExporterTest<T, U extends Message> {
     }
   }
 
+  @Test
+  void stringRepresentation() throws IOException, CertificateEncodingException {
+    TelemetryExporter<T> telemetryExporter = exporterBuilder().build();
+    try {
+      assertThat(telemetryExporter.unwrap().toString())
+          .matches(
+              "OtlpHttp[a-zA-Z]*Exporter\\{"
+                  + "exporterName=otlp, "
+                  + "type=[a-zA_Z]*, "
+                  + "endpoint=http://localhost:4318/v1/[a-zA-Z]*, "
+                  + "timeoutNanos="
+                  + TimeUnit.SECONDS.toNanos(10)
+                  + ", "
+                  + "compressionEnabled=false, "
+                  + "exportAsJson=false, "
+                  + "headers=Headers\\{User-Agent=OBFUSCATED\\}"
+                  + "\\}");
+    } finally {
+      telemetryExporter.shutdown();
+    }
+
+    telemetryExporter =
+        exporterBuilder()
+            .setTimeout(Duration.ofSeconds(5))
+            .setEndpoint("http://example:4318/v1/logs")
+            .setCompression("gzip")
+            .addHeader("foo", "bar")
+            .setTrustedCertificates(certificate.certificate().getEncoded())
+            .setClientTls(
+                Files.readAllBytes(clientCertificate.privateKeyFile().toPath()),
+                Files.readAllBytes(clientCertificate.certificateFile().toPath()))
+            .setRetryPolicy(
+                RetryPolicy.builder()
+                    .setMaxAttempts(2)
+                    .setMaxBackoff(Duration.ofSeconds(3))
+                    .setInitialBackoff(Duration.ofMillis(50))
+                    .setBackoffMultiplier(1.3)
+                    .build())
+            .build();
+    try {
+      assertThat(telemetryExporter.unwrap().toString())
+          .matches(
+              "OtlpHttp[a-zA-Z]*Exporter\\{"
+                  + "exporterName=otlp, "
+                  + "type=[a-zA_Z]*, "
+                  + "endpoint=http://example:4318/v1/[a-zA-Z]*, "
+                  + "timeoutNanos="
+                  + TimeUnit.SECONDS.toNanos(5)
+                  + ", "
+                  + "compressionEnabled=true, "
+                  + "exportAsJson=false, "
+                  + "headers=Headers\\{.*foo=OBFUSCATED.*\\}, "
+                  + "retryPolicy=RetryPolicy\\{maxAttempts=2, initialBackoff=PT0\\.05S, maxBackoff=PT3S, backoffMultiplier=1\\.3\\}"
+                  + "\\}");
+    } finally {
+      telemetryExporter.shutdown();
+    }
+  }
+
   protected abstract TelemetryExporterBuilder<T> exporterBuilder();
 
   protected abstract TelemetryExporterBuilder<T> toBuilder(TelemetryExporter<T> exporter);

exporters/otlp/testing-internal/src/main/java/io/opentelemetry/exporter/otlp/testing/internal/ManagedChannelTelemetryExporterBuilder.java

@@ -90,6 +90,7 @@ public final class ManagedChannelTelemetryExporterBuilder<T>
 
   @Override
   public TelemetryExporterBuilder<T> setAuthenticator(Authenticator authenticator) {
+    delegate.setAuthenticator(authenticator);
     return this;
   }
 
@@ -99,18 +100,21 @@ public final class ManagedChannelTelemetryExporterBuilder<T>
 
   @Override
   public TelemetryExporterBuilder<T> setTrustedCertificates(byte[] certificates) {
+    delegate.setTrustedCertificates(certificates);
     tlsConfigHelper.setTrustManagerFromCerts(certificates);
     return this;
   }
 
   @Override
   public TelemetryExporterBuilder<T> setClientTls(byte[] privateKeyPem, byte[] certificatePem) {
+    delegate.setClientTls(privateKeyPem, certificatePem);
     tlsConfigHelper.setKeyManagerFromCerts(privateKeyPem, certificatePem);
     return this;
   }
 
   @Override
   public TelemetryExporterBuilder<T> setRetryPolicy(RetryPolicy retryPolicy) {
+    delegate.setRetryPolicy(retryPolicy);
     String grpcServiceName;
     if (delegate instanceof GrpcLogRecordExporterBuilderWrapper) {
       grpcServiceName = "opentelemetry.proto.collector.logs.v1.LogsService";
@@ -167,6 +171,7 @@ public final class ManagedChannelTelemetryExporterBuilder<T>
   @Override
   public TelemetryExporterBuilder<T> setSslContext(
       SSLContext sslContext, X509TrustManager trustManager) {
+    delegate.setSslContext(sslContext, trustManager);
     tlsConfigHelper.setSslContext(sslContext, trustManager);
     return this;
   }