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Merge pull request googleapis#27 from shinfan/dev
Insert custom headers via HeaderInterceptor.
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37 changes: 37 additions & 0 deletions
37
src/main/java/com/google/api/gax/grpc/HeaderInterceptor.java
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package com.google.api.gax.grpc; | ||
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import io.grpc.CallOptions; | ||
import io.grpc.Channel; | ||
import io.grpc.ClientCall; | ||
import io.grpc.ClientInterceptor; | ||
import io.grpc.ForwardingClientCall.SimpleForwardingClientCall; | ||
import io.grpc.Metadata; | ||
import io.grpc.MethodDescriptor; | ||
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/** | ||
* An intercepter to handle custom header. | ||
*/ | ||
public class HeaderInterceptor implements ClientInterceptor { | ||
private static final Metadata.Key<String> HEADER_KEY = | ||
Metadata.Key.of("x-google-apis-agent", Metadata.ASCII_STRING_MARSHALLER); | ||
private final String header; | ||
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public HeaderInterceptor(String header) { | ||
this.header = header; | ||
} | ||
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@Override | ||
public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall( | ||
MethodDescriptor<ReqT, RespT> method, | ||
CallOptions callOptions, | ||
Channel next) { | ||
ClientCall<ReqT, RespT> call = next.newCall(method, callOptions); | ||
return new SimpleForwardingClientCall<ReqT, RespT>(call) { | ||
@Override | ||
public void start(ClientCall.Listener<RespT> responseListener, Metadata headers) { | ||
headers.put(HEADER_KEY, header); | ||
super.start(responseListener, headers); | ||
} | ||
}; | ||
} | ||
} |
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69
src/test/java/com/google/api/gax/grpc/HeaderInterceptorTest.java
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package com.google.api.gax.grpc; | ||
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import static org.junit.Assert.assertEquals; | ||
import static org.mockito.Matchers.any; | ||
import static org.mockito.Matchers.same; | ||
import static org.mockito.Mockito.mock; | ||
import static org.mockito.Mockito.verify; | ||
import static org.mockito.Mockito.when; | ||
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import org.junit.Before; | ||
import org.junit.Test; | ||
import org.junit.runner.RunWith; | ||
import org.junit.runners.JUnit4; | ||
import org.mockito.ArgumentCaptor; | ||
import org.mockito.Mock; | ||
import org.mockito.Mockito; | ||
import org.mockito.MockitoAnnotations; | ||
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import io.grpc.CallOptions; | ||
import io.grpc.Channel; | ||
import io.grpc.ClientCall; | ||
import io.grpc.ClientInterceptors; | ||
import io.grpc.Metadata; | ||
import io.grpc.MethodDescriptor; | ||
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/** | ||
* Tests for {@link HeaderInterceptor}. | ||
*/ | ||
@RunWith(JUnit4.class) | ||
public class HeaderInterceptorTest { | ||
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@Mock | ||
private Channel channel; | ||
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@Mock | ||
private ClientCall<String, Integer> call; | ||
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@Mock | ||
private MethodDescriptor<String, Integer> method; | ||
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/** | ||
* Sets up mocks. | ||
*/ | ||
@Before public void setUp() { | ||
MockitoAnnotations.initMocks(this); | ||
when(channel.newCall( | ||
Mockito.<MethodDescriptor<String, Integer>>any(), any(CallOptions.class))) | ||
.thenReturn(call); | ||
} | ||
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@Test | ||
public void testInterceptor() { | ||
final Metadata.Key<String> headerKey = | ||
Metadata.Key.of("x-google-apis-agent", Metadata.ASCII_STRING_MARSHALLER); | ||
String data = "abcd"; | ||
HeaderInterceptor interceptor = new HeaderInterceptor(data); | ||
Channel intercepted = ClientInterceptors.intercept(channel, interceptor); | ||
@SuppressWarnings("unchecked") | ||
ClientCall.Listener<Integer> listener = mock(ClientCall.Listener.class); | ||
ClientCall<String, Integer> interceptedCall = intercepted.newCall(method, CallOptions.DEFAULT); | ||
// start() on the intercepted call will eventually reach the call created by the real channel | ||
interceptedCall.start(listener, new Metadata()); | ||
// The headers passed to the real channel call will contain the information inserted by the | ||
// interceptor. | ||
ArgumentCaptor<Metadata> captor = ArgumentCaptor.forClass(Metadata.class); | ||
verify(call).start(same(listener), captor.capture()); | ||
assertEquals(data, captor.getValue().get(headerKey)); | ||
} | ||
} |