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The official Couchbase JVM Core IO Library
/*
* Copyright (c) 2019 Couchbase, Inc.
*
* 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
*
* http://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.couchbase.client.core.msg.kv;
import com.couchbase.client.core.CoreContext;
import com.couchbase.client.core.config.ConfigVersion;
import com.couchbase.client.core.deps.io.netty.buffer.ByteBuf;
import com.couchbase.client.core.deps.io.netty.buffer.ByteBufAllocator;
import com.couchbase.client.core.deps.io.netty.buffer.Unpooled;
import com.couchbase.client.core.io.netty.kv.KeyValueChannelContext;
import com.couchbase.client.core.io.netty.kv.MemcacheProtocol;
import com.couchbase.client.core.msg.TargetedRequest;
import com.couchbase.client.core.msg.UnmonitoredRequest;
import com.couchbase.client.core.node.NodeIdentifier;
import com.couchbase.client.core.retry.RetryStrategy;
import reactor.util.annotation.Nullable;
import java.time.Duration;
import java.util.Map;
import java.util.Optional;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.Opcode;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.bodyAsBytes;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.decodeStatus;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noBody;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noCas;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noDatatype;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noExtras;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noKey;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noPartition;
import static com.couchbase.client.core.logging.RedactableArgument.redactSystem;
/**
* A request to fetch a global configuration.
*
* Note that this request is technicall the same as a {@link CarrierBucketConfigRequest}, but it makes it clear
* that it is not tied to a bucket (and as a result does not accept one when being constructed).
*/
public class CarrierGlobalConfigRequest
extends BaseKeyValueRequest
implements TargetedRequest, UnmonitoredRequest {
private final NodeIdentifier target;
private final ConfigVersion ifNewerThan;
public CarrierGlobalConfigRequest(
final Duration timeout,
final CoreContext ctx,
final RetryStrategy retryStrategy,
final NodeIdentifier target,
@Nullable final ConfigVersion ifNewerThan
) {
super(timeout, ctx, retryStrategy, null, null);
this.target = target;
this.ifNewerThan = Optional.ofNullable(ifNewerThan).orElse(ConfigVersion.ZERO);
}
@Override
public NodeIdentifier target() {
return target;
}
@Override
public ByteBuf encode(
final ByteBufAllocator alloc,
final int opaque,
final KeyValueChannelContext ctx
) {
return encodeConfigRequest(alloc, opaque, ctx, ifNewerThan);
}
static ByteBuf encodeConfigRequest(
final ByteBufAllocator alloc,
final int opaque,
final KeyValueChannelContext ctx,
final ConfigVersion ifNewerThan
) {
return MemcacheProtocol.request(
alloc,
Opcode.GET_CONFIG,
noDatatype(),
noPartition(),
opaque,
noCas(),
requestExtras(ifNewerThan, ctx),
noKey(),
noBody()
);
}
private static ByteBuf requestExtras(
final ConfigVersion ifNewerThan,
final KeyValueChannelContext ctx
) {
if (!ctx.getClusterConfigWithKnownVersion() || ifNewerThan.isLessThanOrEqualTo(ConfigVersion.ZERO)) {
return noExtras();
}
return Unpooled.buffer(16)
.writeLong(ifNewerThan.epoch())
.writeLong(ifNewerThan.rev());
}
@Override
public CarrierGlobalConfigResponse decode(final ByteBuf response, final KeyValueChannelContext ctx) {
byte[] content = bodyAsBytes(response);
return new CarrierGlobalConfigResponse(decodeStatus(response), content);
}
@Override
public boolean idempotent() {
return true;
}
@Override
public Map serviceContext() {
final Map ctx = super.serviceContext();
if (target != null) {
ctx.put("target", redactSystem(target.address()));
}
return ctx;
}
@Override
public String name() {
return "carrier_global_config";
}
@Override
public String toString() {
return "CarrierGlobalConfigRequest{" +
"target=" + redactSystem(target.address()) +
", ifNewerThan=" + ifNewerThan +
'}';
}
}