/
CookiesInterceptor.java
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/
CookiesInterceptor.java
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/*
* Copyright 2023 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.cloud.bigtable.data.v2.stub;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.ForwardingClientCallListener;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A cookie interceptor that checks the cookie value from returned trailer, updates the cookie
* holder, and inject it in the header of the next request.
*/
class CookiesInterceptor implements ClientInterceptor {
private static final Logger LOG = Logger.getLogger(CookiesInterceptor.class.getName());
@Override
public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
MethodDescriptor<ReqT, RespT> methodDescriptor, CallOptions callOptions, Channel channel) {
return new ForwardingClientCall.SimpleForwardingClientCall<ReqT, RespT>(
channel.newCall(methodDescriptor, callOptions)) {
@Override
public void start(Listener<RespT> responseListener, Metadata headers) {
// Gets the CookiesHolder added from CookiesServerStreamingCallable and
// CookiesUnaryCallable.
// Add CookiesHolder content to request headers if there's any.
try {
CookiesHolder cookie = CookiesHolder.fromCallOptions(callOptions);
if (cookie != null) {
headers = cookie.injectCookiesInRequestHeaders(headers);
responseListener = new UpdateCookieListener<>(responseListener, cookie);
}
} catch (Throwable e) {
LOG.warning("Failed to inject cookie to request headers: " + e);
} finally {
super.start(responseListener, headers);
}
}
};
}
/** Add headers and trailers to CookiesHolder if there's any. * */
static class UpdateCookieListener<RespT>
extends ForwardingClientCallListener.SimpleForwardingClientCallListener<RespT> {
private final CookiesHolder cookie;
UpdateCookieListener(ClientCall.Listener<RespT> delegate, CookiesHolder cookiesHolder) {
super(delegate);
this.cookie = cookiesHolder;
}
@Override
public void onHeaders(Metadata headers) {
try {
cookie.extractCookiesFromMetadata(headers);
} catch (Throwable e) {
LOG.log(Level.WARNING, "Failed to extract cookie from response headers.", e);
} finally {
super.onHeaders(headers);
}
}
@Override
public void onClose(Status status, Metadata trailers) {
try {
cookie.extractCookiesFromMetadata(trailers);
} catch (Throwable e) {
LOG.log(Level.WARNING, "Failed to extract cookie from response trailers.", e);
} finally {
super.onClose(status, trailers);
}
}
}
}