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LocalChannelProvider.java
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LocalChannelProvider.java
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/*
* Copyright 2016 Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.api.gax.grpc.testing;
import com.google.api.core.BetaApi;
import com.google.api.gax.grpc.GrpcHeaderInterceptor;
import com.google.api.gax.grpc.GrpcTransportChannel;
import com.google.api.gax.rpc.FixedHeaderProvider;
import com.google.api.gax.rpc.HeaderProvider;
import com.google.api.gax.rpc.TransportChannel;
import com.google.api.gax.rpc.TransportChannelProvider;
import com.google.auth.Credentials;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall.SimpleForwardingClientCall;
import io.grpc.ManagedChannelBuilder;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.inprocess.InProcessChannelBuilder;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Executor;
import java.util.concurrent.ScheduledExecutorService;
import java.util.regex.Pattern;
/** LocalChannelProvider creates channels for in-memory gRPC services. */
@BetaApi
public class LocalChannelProvider implements TransportChannelProvider {
private final List<LocalHeaderInterceptor> interceptors;
private final String address;
private volatile HeaderProvider headerProvider;
private LocalChannelProvider(String address, HeaderProvider headerProvider) {
this.interceptors = new CopyOnWriteArrayList<>();
this.address = address;
this.headerProvider = headerProvider;
}
@Override
public boolean shouldAutoClose() {
return true;
}
@Override
public boolean needsExecutor() {
return false;
}
@Deprecated
@Override
public TransportChannelProvider withExecutor(ScheduledExecutorService executor) {
return withExecutor((Executor) executor);
}
@Override
public TransportChannelProvider withExecutor(Executor executor) {
throw new UnsupportedOperationException("LocalChannelProvider doesn't need an executor");
}
@Override
public boolean needsHeaders() {
return headerProvider == null;
}
@Override
public boolean needsEndpoint() {
return false;
}
@Override
public TransportChannelProvider withEndpoint(String endpoint) {
throw new UnsupportedOperationException("LocalChannelProvider doesn't need an endpoint");
}
@Override
@BetaApi("The surface for customizing pool size is not stable yet and may change in the future.")
public boolean acceptsPoolSize() {
return false;
}
@Override
@BetaApi("The surface for customizing pool size is not stable yet and may change in the future.")
public TransportChannelProvider withPoolSize(int size) {
throw new UnsupportedOperationException(
"LocalChannelProvider doesn't allow pool size customization");
}
@Override
public TransportChannelProvider withHeaders(Map<String, String> headers) {
this.headerProvider = FixedHeaderProvider.create(headers);
return this;
}
@Override
public TransportChannel getTransportChannel() throws IOException {
ManagedChannelBuilder channelBuilder = InProcessChannelBuilder.forName(address).usePlaintext();
if (headerProvider != null) {
GrpcHeaderInterceptor interceptor = new GrpcHeaderInterceptor(headerProvider.getHeaders());
LocalHeaderInterceptor localHeaderInterceptor = new LocalHeaderInterceptor(interceptor);
interceptors.add(localHeaderInterceptor);
channelBuilder.intercept(localHeaderInterceptor).userAgent(interceptor.getUserAgentHeader());
}
return GrpcTransportChannel.newBuilder().setManagedChannel(channelBuilder.build()).build();
}
@Override
public String getTransportName() {
return GrpcTransportChannel.getGrpcTransportName();
}
@Override
public boolean needsCredentials() {
return false;
}
@Override
public TransportChannelProvider withCredentials(Credentials credentials) {
throw new UnsupportedOperationException("LocalChannelProvider doesn't need credentials");
}
/** Creates a LocalChannelProvider. */
public static LocalChannelProvider create(String addressString) {
return new LocalChannelProvider(addressString, null);
}
public boolean isHeaderSent(String headerKey, Pattern headerPattern) {
Metadata.Key<String> key = Metadata.Key.of(headerKey, Metadata.ASCII_STRING_MARSHALLER);
if (interceptors.isEmpty()) {
return false;
}
for (LocalHeaderInterceptor interceptor : interceptors) {
if (interceptor.getSubmittedHeaders().isEmpty()) {
return false;
}
for (Metadata submittedHeaders : interceptor.getSubmittedHeaders()) {
String headerValue = submittedHeaders.get(key);
if (headerValue == null || !headerPattern.matcher(headerValue).matches()) {
return false;
}
}
}
return true;
}
private static class LocalHeaderInterceptor implements ClientInterceptor {
private final ClientInterceptor innerInterceptor;
private final List<Metadata> submittedHeaders;
private LocalHeaderInterceptor(ClientInterceptor innerInterceptor) {
this.innerInterceptor = innerInterceptor;
this.submittedHeaders = new CopyOnWriteArrayList<>();
}
@Override
public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, Channel next) {
ClientCall<ReqT, RespT> call = innerInterceptor.interceptCall(method, callOptions, next);
return new SimpleForwardingClientCall<ReqT, RespT>(call) {
@Override
public void start(Listener<RespT> responseListener, Metadata headers) {
super.start(responseListener, headers);
submittedHeaders.add(headers);
}
};
}
List<Metadata> getSubmittedHeaders() {
return submittedHeaders;
}
}
}