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<?xml version="1.0" encoding="UTF-8"?> | ||
<!-- | ||
Licensed to the Apache Software Foundation (ASF) under one or more | ||
contributor license agreements. See the NOTICE file distributed with | ||
this work for additional information regarding copyright ownership. | ||
The ASF licenses this file to You 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. | ||
--> | ||
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
xmlns="http://maven.apache.org/POM/4.0.0" | ||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
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<modelVersion>4.0.0</modelVersion> | ||
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<parent> | ||
<groupId>org.apache.hugegraph</groupId> | ||
<artifactId>hugegraph-pd</artifactId> | ||
<version>${revision}</version> | ||
<relativePath>../pom.xml</relativePath> | ||
</parent> | ||
<artifactId>hg-pd-client</artifactId> | ||
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<dependencies> | ||
<dependency> | ||
<groupId>org.projectlombok</groupId> | ||
<artifactId>lombok</artifactId> | ||
<version>1.18.20</version> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.apache.logging.log4j</groupId> | ||
<artifactId>log4j-slf4j-impl</artifactId> | ||
<version>2.17.0</version> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.apache.hugegraph</groupId> | ||
<artifactId>hg-pd-grpc</artifactId> | ||
<version>${revision}</version> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.apache.hugegraph</groupId> | ||
<artifactId>hg-pd-common</artifactId> | ||
<version>${revision}</version> | ||
<scope>compile</scope> | ||
</dependency> | ||
<dependency> | ||
<groupId>junit</groupId> | ||
<artifactId>junit</artifactId> | ||
<version>4.13.2</version> | ||
<scope>test</scope> | ||
</dependency> | ||
<dependency> | ||
<groupId>commons-io</groupId> | ||
<artifactId>commons-io</artifactId> | ||
<version>2.8.0</version> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.yaml</groupId> | ||
<artifactId>snakeyaml</artifactId> | ||
<version>1.28</version> | ||
<scope>test</scope> | ||
</dependency> | ||
</dependencies> | ||
</project> |
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hugegraph-pd/hg-pd-client/src/main/java/org/apache/hugegraph/pd/client/AbstractClient.java
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one or more | ||
* contributor license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright ownership. | ||
* The ASF licenses this file to You 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. | ||
*/ | ||
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package org.apache.hugegraph.pd.client; | ||
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import java.io.Closeable; | ||
import java.util.LinkedList; | ||
import java.util.concurrent.ConcurrentHashMap; | ||
import java.util.concurrent.ConcurrentMap; | ||
import java.util.concurrent.TimeUnit; | ||
import java.util.concurrent.atomic.AtomicReference; | ||
import java.util.function.Predicate; | ||
import java.util.stream.Stream; | ||
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import org.apache.hugegraph.pd.common.KVPair; | ||
import org.apache.hugegraph.pd.common.PDException; | ||
import org.apache.hugegraph.pd.grpc.Metapb; | ||
import org.apache.hugegraph.pd.grpc.PDGrpc; | ||
import org.apache.hugegraph.pd.grpc.PDGrpc.PDBlockingStub; | ||
import org.apache.hugegraph.pd.grpc.Pdpb; | ||
import org.apache.hugegraph.pd.grpc.Pdpb.GetMembersRequest; | ||
import org.apache.hugegraph.pd.grpc.Pdpb.GetMembersResponse; | ||
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import io.grpc.Channel; | ||
import io.grpc.ClientCall; | ||
import io.grpc.ManagedChannel; | ||
import io.grpc.ManagedChannelBuilder; | ||
import io.grpc.MethodDescriptor; | ||
import io.grpc.StatusRuntimeException; | ||
import io.grpc.stub.AbstractBlockingStub; | ||
import io.grpc.stub.AbstractStub; | ||
import io.grpc.stub.ClientCalls; | ||
import io.grpc.stub.StreamObserver; | ||
import lombok.extern.slf4j.Slf4j; | ||
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@Slf4j | ||
public abstract class AbstractClient implements Closeable { | ||
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private static final ConcurrentHashMap<String, ManagedChannel> chs = new ConcurrentHashMap<>(); | ||
public static Pdpb.ResponseHeader okHeader = Pdpb.ResponseHeader.newBuilder().setError( | ||
Pdpb.Error.newBuilder().setType(Pdpb.ErrorType.OK)).build(); | ||
protected final Pdpb.RequestHeader header; | ||
protected final AbstractClientStubProxy stubProxy; | ||
protected final PDConfig config; | ||
protected ManagedChannel channel = null; | ||
protected volatile ConcurrentMap<String, AbstractBlockingStub> stubs = null; | ||
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protected AbstractClient(PDConfig config) { | ||
String[] hosts = config.getServerHost().split(","); | ||
this.stubProxy = new AbstractClientStubProxy(hosts); | ||
this.header = Pdpb.RequestHeader.getDefaultInstance(); | ||
this.config = config; | ||
} | ||
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public static Pdpb.ResponseHeader newErrorHeader(int errorCode, String errorMsg) { | ||
Pdpb.ResponseHeader header = Pdpb.ResponseHeader.newBuilder().setError( | ||
Pdpb.Error.newBuilder().setTypeValue(errorCode).setMessage(errorMsg)).build(); | ||
return header; | ||
} | ||
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protected static void handleErrors(Pdpb.ResponseHeader header) throws PDException { | ||
if (header.hasError() && header.getError().getType() != Pdpb.ErrorType.OK) { | ||
throw new PDException(header.getError().getTypeValue(), | ||
String.format("PD request error, error code = %d, msg = %s", | ||
header.getError().getTypeValue(), | ||
header.getError().getMessage())); | ||
} | ||
} | ||
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protected AbstractBlockingStub getBlockingStub() throws PDException { | ||
if (stubProxy.getBlockingStub() == null) { | ||
synchronized (this) { | ||
if (stubProxy.getBlockingStub() == null) { | ||
String host = resetStub(); | ||
if (host.isEmpty()) { | ||
throw new PDException(Pdpb.ErrorType.PD_UNREACHABLE_VALUE, | ||
"PD unreachable, pd.peers=" + | ||
config.getServerHost()); | ||
} | ||
} | ||
} | ||
} | ||
return (AbstractBlockingStub) stubProxy.getBlockingStub() | ||
.withDeadlineAfter(config.getGrpcTimeOut(), | ||
TimeUnit.MILLISECONDS); | ||
} | ||
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protected AbstractStub getStub() throws PDException { | ||
if (stubProxy.getStub() == null) { | ||
synchronized (this) { | ||
if (stubProxy.getStub() == null) { | ||
String host = resetStub(); | ||
if (host.isEmpty()) { | ||
throw new PDException(Pdpb.ErrorType.PD_UNREACHABLE_VALUE, | ||
"PD unreachable, pd.peers=" + | ||
config.getServerHost()); | ||
} | ||
} | ||
} | ||
} | ||
return stubProxy.getStub(); | ||
} | ||
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protected abstract AbstractStub createStub(); | ||
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protected abstract AbstractBlockingStub createBlockingStub(); | ||
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private String resetStub() { | ||
String leaderHost = ""; | ||
for (int i = 0; i < stubProxy.getHostCount(); i++) { | ||
String host = stubProxy.nextHost(); | ||
channel = ManagedChannelBuilder.forTarget(host).usePlaintext().build(); | ||
PDBlockingStub blockingStub = PDGrpc.newBlockingStub(channel) | ||
.withDeadlineAfter(config.getGrpcTimeOut(), | ||
TimeUnit.MILLISECONDS); | ||
try { | ||
GetMembersRequest request = Pdpb.GetMembersRequest.newBuilder() | ||
.setHeader(header).build(); | ||
GetMembersResponse members = blockingStub.getMembers(request); | ||
Metapb.Member leader = members.getLeader(); | ||
leaderHost = leader.getGrpcUrl(); | ||
close(); | ||
channel = ManagedChannelBuilder.forTarget(leaderHost).usePlaintext().build(); | ||
stubProxy.setBlockingStub(createBlockingStub()); | ||
stubProxy.setStub(createStub()); | ||
log.info("PDClient connect to host = {} success", leaderHost); | ||
break; | ||
} catch (Exception e) { | ||
log.error("PDClient connect to {} exception {}, {}", host, e.getMessage(), | ||
e.getCause() != null ? e.getCause().getMessage() : ""); | ||
} | ||
} | ||
return leaderHost; | ||
} | ||
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protected <ReqT, RespT, StubT extends AbstractBlockingStub<StubT>> RespT blockingUnaryCall( | ||
MethodDescriptor<ReqT, RespT> method, ReqT req) throws PDException { | ||
return blockingUnaryCall(method, req, 5); | ||
} | ||
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protected <ReqT, RespT, StubT extends AbstractBlockingStub<StubT>> RespT blockingUnaryCall( | ||
MethodDescriptor<ReqT, RespT> method, ReqT req, int retry) throws PDException { | ||
AbstractBlockingStub stub = getBlockingStub(); | ||
try { | ||
RespT resp = | ||
ClientCalls.blockingUnaryCall(stub.getChannel(), method, stub.getCallOptions(), | ||
req); | ||
return resp; | ||
} catch (Exception e) { | ||
log.error(method.getFullMethodName() + " exception, {}", e.getMessage()); | ||
if (e instanceof StatusRuntimeException) { | ||
if (retry < stubProxy.getHostCount()) { | ||
// 网络不通,关掉之前连接,换host重新连接 | ||
synchronized (this) { | ||
stubProxy.setBlockingStub(null); | ||
} | ||
return blockingUnaryCall(method, req, ++retry); | ||
} | ||
} | ||
} | ||
return null; | ||
} | ||
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// this.stubs = new ConcurrentHashMap<String,AbstractBlockingStub>(hosts.length); | ||
private AbstractBlockingStub getConcurrentBlockingStub(String address) { | ||
AbstractBlockingStub stub = stubs.get(address); | ||
if (stub != null) { | ||
return stub; | ||
} | ||
Channel ch = ManagedChannelBuilder.forTarget(address).usePlaintext().build(); | ||
PDBlockingStub blockingStub = | ||
PDGrpc.newBlockingStub(ch).withDeadlineAfter(config.getGrpcTimeOut(), | ||
TimeUnit.MILLISECONDS); | ||
stubs.put(address, blockingStub); | ||
return blockingStub; | ||
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} | ||
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protected <ReqT, RespT> KVPair<Boolean, RespT> concurrentBlockingUnaryCall( | ||
MethodDescriptor<ReqT, RespT> method, ReqT req, Predicate<RespT> predicate) { | ||
LinkedList<String> hostList = this.stubProxy.getHostList(); | ||
if (this.stubs == null) { | ||
synchronized (this) { | ||
if (this.stubs == null) { | ||
this.stubs = new ConcurrentHashMap<>(hostList.size()); | ||
} | ||
} | ||
} | ||
Stream<RespT> respTStream = hostList.parallelStream().map((address) -> { | ||
AbstractBlockingStub stub = getConcurrentBlockingStub(address); | ||
RespT resp = ClientCalls.blockingUnaryCall(stub.getChannel(), | ||
method, stub.getCallOptions(), req); | ||
return resp; | ||
}); | ||
KVPair<Boolean, RespT> pair; | ||
AtomicReference<RespT> response = new AtomicReference<>(); | ||
boolean result = respTStream.anyMatch((r) -> { | ||
response.set(r); | ||
return predicate.test(r); | ||
}); | ||
if (result) { | ||
pair = new KVPair<>(true, null); | ||
} else { | ||
pair = new KVPair<>(false, response.get()); | ||
} | ||
return pair; | ||
} | ||
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protected <ReqT, RespT> void streamingCall(MethodDescriptor<ReqT, RespT> method, ReqT request, | ||
StreamObserver<RespT> responseObserver, | ||
int retry) throws PDException { | ||
AbstractStub stub = getStub(); | ||
try { | ||
ClientCall<ReqT, RespT> call = stub.getChannel().newCall(method, stub.getCallOptions()); | ||
ClientCalls.asyncServerStreamingCall(call, request, responseObserver); | ||
} catch (Exception e) { | ||
if (e instanceof StatusRuntimeException) { | ||
if (retry < stubProxy.getHostCount()) { | ||
synchronized (this) { | ||
stubProxy.setStub(null); | ||
} | ||
streamingCall(method, request, responseObserver, ++retry); | ||
return; | ||
} | ||
} | ||
log.error("rpc call with exception, {}", e.getMessage()); | ||
} | ||
} | ||
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@Override | ||
public void close() { | ||
closeChannel(channel); | ||
if (stubs != null) { | ||
for (AbstractBlockingStub stub : stubs.values()) { | ||
closeChannel((ManagedChannel) stub.getChannel()); | ||
} | ||
} | ||
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} | ||
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private void closeChannel(ManagedChannel channel) { | ||
try { | ||
while (channel != null && | ||
!channel.shutdownNow().awaitTermination(100, TimeUnit.MILLISECONDS)) { | ||
continue; | ||
} | ||
} catch (Exception e) { | ||
log.info("Close channel with error : ", e); | ||
} | ||
} | ||
} |
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