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GrpcExporterBuilder.java
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GrpcExporterBuilder.java
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/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.exporter.internal.grpc;
import io.grpc.Channel;
import io.grpc.ClientInterceptors;
import io.grpc.Codec;
import io.grpc.ManagedChannel;
import io.grpc.Metadata;
import io.grpc.stub.MetadataUtils;
import io.opentelemetry.api.metrics.MeterProvider;
import io.opentelemetry.exporter.internal.ExporterBuilderUtil;
import io.opentelemetry.exporter.internal.TlsUtil;
import io.opentelemetry.exporter.internal.marshal.Marshaler;
import io.opentelemetry.exporter.internal.okhttp.OkHttpUtil;
import io.opentelemetry.exporter.internal.retry.RetryInterceptor;
import io.opentelemetry.exporter.internal.retry.RetryPolicy;
import java.net.URI;
import java.time.Duration;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.function.BiFunction;
import java.util.function.Supplier;
import javax.annotation.Nullable;
import javax.net.ssl.SSLException;
import javax.net.ssl.X509KeyManager;
import javax.net.ssl.X509TrustManager;
import okhttp3.Headers;
import okhttp3.OkHttpClient;
import okhttp3.Protocol;
/**
* A builder for {@link GrpcExporter}.
*
* <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
* at any time.
*/
@SuppressWarnings("JavadocMethod")
public class GrpcExporterBuilder<T extends Marshaler> {
private final String exporterName;
private final String type;
private final String grpcEndpointPath;
private final Supplier<BiFunction<Channel, String, MarshalerServiceStub<T, ?, ?>>>
grpcStubFactory;
private long timeoutNanos;
private URI endpoint;
private boolean compressionEnabled = false;
private final Map<String, String> headers = new HashMap<>();
@Nullable private byte[] trustedCertificatesPem;
@Nullable private byte[] privateKeyPem;
@Nullable private byte[] certificatePem;
@Nullable private RetryPolicy retryPolicy;
private MeterProvider meterProvider = MeterProvider.noop();
// Use Object type since gRPC may not be on the classpath.
@Nullable private Object grpcChannel;
GrpcExporterBuilder(
String exporterName,
String type,
long defaultTimeoutSecs,
URI defaultEndpoint,
Supplier<BiFunction<Channel, String, MarshalerServiceStub<T, ?, ?>>> grpcStubFactory,
String grpcEndpointPath) {
this.exporterName = exporterName;
this.type = type;
this.grpcEndpointPath = grpcEndpointPath;
timeoutNanos = TimeUnit.SECONDS.toNanos(defaultTimeoutSecs);
endpoint = defaultEndpoint;
this.grpcStubFactory = grpcStubFactory;
}
public GrpcExporterBuilder<T> setChannel(ManagedChannel channel) {
this.grpcChannel = channel;
return this;
}
public GrpcExporterBuilder<T> setTimeout(long timeout, TimeUnit unit) {
timeoutNanos = unit.toNanos(timeout);
return this;
}
public GrpcExporterBuilder<T> setTimeout(Duration timeout) {
return setTimeout(timeout.toNanos(), TimeUnit.NANOSECONDS);
}
public GrpcExporterBuilder<T> setEndpoint(String endpoint) {
this.endpoint = ExporterBuilderUtil.validateEndpoint(endpoint);
return this;
}
public GrpcExporterBuilder<T> setCompression(String compressionMethod) {
this.compressionEnabled = compressionMethod.equals("gzip");
return this;
}
public GrpcExporterBuilder<T> setTrustedCertificates(byte[] trustedCertificatesPem) {
this.trustedCertificatesPem = trustedCertificatesPem;
return this;
}
public GrpcExporterBuilder<T> setClientTls(byte[] privateKeyPem, byte[] certificatePem) {
this.privateKeyPem = privateKeyPem;
this.certificatePem = certificatePem;
return this;
}
public GrpcExporterBuilder<T> addHeader(String key, String value) {
headers.put(key, value);
return this;
}
public GrpcExporterBuilder<T> setRetryPolicy(RetryPolicy retryPolicy) {
this.retryPolicy = retryPolicy;
return this;
}
public GrpcExporterBuilder<T> setMeterProvider(MeterProvider meterProvider) {
this.meterProvider = meterProvider;
return this;
}
public GrpcExporter<T> build() {
if (grpcChannel != null) {
return new UpstreamGrpcExporterFactory().buildWithChannel((Channel) grpcChannel);
}
OkHttpClient.Builder clientBuilder =
new OkHttpClient.Builder().dispatcher(OkHttpUtil.newDispatcher());
clientBuilder.callTimeout(Duration.ofNanos(timeoutNanos));
if (trustedCertificatesPem != null) {
try {
X509TrustManager trustManager = TlsUtil.trustManager(trustedCertificatesPem);
X509KeyManager keyManager = null;
if (privateKeyPem != null && certificatePem != null) {
keyManager = TlsUtil.keyManager(privateKeyPem, certificatePem);
}
clientBuilder.sslSocketFactory(
TlsUtil.sslSocketFactory(keyManager, trustManager), trustManager);
} catch (SSLException e) {
throw new IllegalStateException(
"Could not set trusted certificates, are they valid X.509 in PEM format?", e);
}
}
String endpoint = this.endpoint.resolve(grpcEndpointPath).toString();
if (endpoint.startsWith("http://")) {
clientBuilder.protocols(Collections.singletonList(Protocol.H2_PRIOR_KNOWLEDGE));
} else {
clientBuilder.protocols(Arrays.asList(Protocol.HTTP_2, Protocol.HTTP_1_1));
}
Headers.Builder headers = new Headers.Builder();
this.headers.forEach(headers::add);
headers.add("te", "trailers");
if (compressionEnabled) {
headers.add("grpc-encoding", "gzip");
}
if (retryPolicy != null) {
clientBuilder.addInterceptor(
new RetryInterceptor(retryPolicy, OkHttpGrpcExporter::isRetryable));
}
return new OkHttpGrpcExporter<>(
exporterName,
type,
clientBuilder.build(),
meterProvider,
endpoint,
headers.build(),
compressionEnabled);
}
// Use an inner class to ensure GrpcExporterBuilder does not have classloading dependencies on
// upstream gRPC.
private class UpstreamGrpcExporterFactory {
private GrpcExporter<T> buildWithChannel(Channel channel) {
Metadata metadata = new Metadata();
String authorityOverride = null;
for (Map.Entry<String, String> entry : headers.entrySet()) {
String name = entry.getKey();
String value = entry.getValue();
if (name.equals("host")) {
authorityOverride = value;
continue;
}
metadata.put(Metadata.Key.of(name, Metadata.ASCII_STRING_MARSHALLER), value);
}
channel =
ClientInterceptors.intercept(
channel, MetadataUtils.newAttachHeadersInterceptor(metadata));
Codec codec = compressionEnabled ? new Codec.Gzip() : Codec.Identity.NONE;
MarshalerServiceStub<T, ?, ?> stub =
grpcStubFactory
.get()
.apply(channel, authorityOverride)
.withCompression(codec.getMessageEncoding());
return new UpstreamGrpcExporter<>(exporterName, type, stub, meterProvider, timeoutNanos);
}
}
}