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[PROTOTYPE] add ClientContext.createWithTransport #14412

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[PROTOTYPE] add ClientContext.createWithTransport #14412

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75 changes: 75 additions & 0 deletions sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientContext.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@
import com.google.api.client.util.Strings;
import com.google.api.core.ApiClock;
import com.google.api.core.BetaApi;
import com.google.api.core.InternalApi;
import com.google.api.core.NanoClock;
import com.google.api.core.ObsoleteApi;
import com.google.api.gax.core.BackgroundResource;
Expand Down Expand Up @@ -292,6 +293,80 @@
.build();
}

/**
* Derives a {@link ClientContext} for a second transport from {@code parent}, replacing the
* transport channel, endpoint and internal headers and inheriting everything else.
*/
@InternalApi
public static ClientContext createWithTransport(
ClientContext parent,
String endpoint,
TransportChannelProvider transportChannelProvider,
HeaderProvider internalHeaderProvider)
throws IOException {
Credentials credentials = parent.getCredentials();
EndpointContext endpointContext = parent.getEndpointContext();

Map<String, String> internal = internalHeaderProvider.getHeaders();
Map<String, String> user = parent.getHeaders();
Map<String, String> conflictResolution = new HashMap<>();

for (String key : Sets.intersection(user.keySet(), internal.keySet())) {

Check warning on line 314 in sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientContext.java

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SonarQubeCloud / [gapic-generator-java-root] SonarCloud Code Analysis

Reduce the total number of break and continue statements in this loop to use at most one. 


See more on https://sonarcloud.io/project/issues?id=googleapis_google-cloud-java_showcase&issues=AaCtQfNhb7eQSQL38fqj&open=AaCtQfNhb7eQSQL38fqj&pullRequest=14412
if ("user-agent".equals(key)) {
conflictResolution.put(key, user.get(key) + " " + internal.get(key));
continue;
}
if (QUOTA_PROJECT_ID_HEADER_KEY.equals(key) && parent.getQuotaProjectId() != null) {
continue;
}
throw new IllegalArgumentException("Header provider can't override the header: " + key);
}
if (parent.getQuotaProjectId() != null) {
conflictResolution.put(QUOTA_PROJECT_ID_HEADER_KEY, parent.getQuotaProjectId());
}

Map<String, String> effective = new HashMap<>();
effective.putAll(internal);
effective.putAll(user);
effective.putAll(conflictResolution);
Map<String, String> headers = appendCredentialTypeToHeaderIfPresent(effective, credentials);

TransportChannelProvider provider = transportChannelProvider;
if (provider.needsHeaders()) {
provider = provider.withHeaders(headers);
}
if (provider.needsCredentials() && credentials != null) {
provider = provider.withCredentials(credentials);
}
if (provider.needsEndpoint()) {
provider = provider.withEndpoint(endpoint);
}
provider = provider.withUseS2A(endpointContext.useS2A());
if (provider.needsMtlsEndpoint() && endpointContext.mtlsEndpoint() != null) {
provider = provider.withMtlsEndpoint(endpointContext.mtlsEndpoint());

Check warning on line 346 in sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientContext.java

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SonarQubeCloud / [gapic-generator-java-root] SonarCloud Code Analysis

Annotate the parameter with @javax.annotation.Nullable in method 'withMtlsEndpoint' declaration, or make sure that null can not be passed as argument. 


See more on https://sonarcloud.io/project/issues?id=googleapis_google-cloud-java_showcase&issues=AaCtQfNhb7eQSQL38fqi&open=AaCtQfNhb7eQSQL38fqi&pullRequest=14412
}
TransportChannel channel = provider.getTransportChannel();

ApiCallContext defaultCallContext = channel.getEmptyCallContext().withTransportChannel(channel);
if (credentials != null) {
defaultCallContext = defaultCallContext.withCredentials(credentials);
}
defaultCallContext = defaultCallContext.withEndpointContext(endpointContext);
Comment on lines +344 to +354

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ImmutableList.Builder<BackgroundResource> backgroundResources = ImmutableList.builder();
if (provider.shouldAutoClose()) {
backgroundResources.add(channel);
}

return parent.toBuilder()
.setEndpoint(endpoint)
.setTransportChannel(channel)
.setInternalHeaders(ImmutableMap.copyOf(internal))
.setDefaultCallContext(defaultCallContext)
.setBackgroundResources(backgroundResources.build())
.build();
}

@VisibleForTesting
static ApiTracerFactory getApiTracerFactory(
StubSettings settings, EndpointContext endpointContext) {
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