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ThriftCallService.java
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ThriftCallService.java
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/*
* Copyright 2015 LINE Corporation
*
* LINE Corporation 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:
*
* 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.linecorp.armeria.server.thrift;
import java.util.List;
import java.util.Map;
import org.apache.thrift.AsyncProcessFunction;
import org.apache.thrift.ProcessFunction;
import org.apache.thrift.TApplicationException;
import org.apache.thrift.TBase;
import org.apache.thrift.TException;
import org.apache.thrift.async.AsyncMethodCallback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.linecorp.armeria.common.CompletableRpcResponse;
import com.linecorp.armeria.common.RequestContext;
import com.linecorp.armeria.common.RpcRequest;
import com.linecorp.armeria.common.RpcResponse;
import com.linecorp.armeria.common.annotation.Nullable;
import com.linecorp.armeria.internal.common.thrift.ThriftFunction;
import com.linecorp.armeria.server.RpcService;
import com.linecorp.armeria.server.ServiceRequestContext;
/**
* An {@link RpcService} that handles a Thrift {@link RpcRequest}.
*
* @see THttpService
*/
public final class ThriftCallService implements RpcService {
private static final Logger logger = LoggerFactory.getLogger(ThriftCallService.class);
private static final AsyncMethodCallback<Object> ONEWAY_CALLBACK = new AsyncMethodCallback<Object>() {
@Override
public void onComplete(Object response) {}
@Override
public void onError(Exception e) {
logOneWayFunctionFailure(RequestContext.currentOrNull(), e);
}
};
/**
* Creates a new instance of {@link ThriftCallServiceBuilder} which can build
* an instance of {@link ThriftCallService} fluently.
*/
public static ThriftCallServiceBuilder builder() {
return new ThriftCallServiceBuilder();
}
private final Map<String, ThriftServiceEntry> entries;
private final boolean useBlockingTaskExecutor;
ThriftCallService(Map<String, ThriftServiceEntry> entries, boolean useBlockingTaskExecutor) {
this.entries = entries;
this.useBlockingTaskExecutor = useBlockingTaskExecutor;
}
/**
* Returns the information about the Thrift services being served.
*
* @return a {@link Map} whose key is a service name, which could be an empty string if this service
* is not multiplexed
*/
public Map<String, ThriftServiceEntry> entries() {
return entries;
}
@Override
public RpcResponse serve(ServiceRequestContext ctx, RpcRequest call) throws Exception {
final int colonPos = call.method().indexOf(':');
final String method;
final String serviceName;
if (colonPos < 0) {
serviceName = "";
method = call.method();
} else {
serviceName = call.method().substring(0, colonPos);
method = call.method().substring(colonPos + 1);
}
// Ensure that such a service exists.
final ThriftServiceEntry e = entries.get(serviceName);
if (e != null) {
// Ensure that such a method exists.
final ThriftFunction f = e.metadata.function(method);
if (f != null) {
if (f.implementation() != null) {
final CompletableRpcResponse reply = new CompletableRpcResponse();
invoke(ctx, f.implementation(), f, call.params(), reply);
return reply;
}
// Should never reach here because of the way ThriftServiceEntry is created
return RpcResponse.ofFailure(new TApplicationException(
TApplicationException.UNKNOWN, "null implementation: " + call.method()));
}
}
return RpcResponse.ofFailure(new TApplicationException(
TApplicationException.UNKNOWN_METHOD, "unknown method: " + call.method()));
}
private void invoke(
ServiceRequestContext ctx,
Object impl, ThriftFunction func, List<Object> args, CompletableRpcResponse reply) {
try {
final TBase<?, ?> tArgs = func.newArgs(args);
if (func.isAsync()) {
if (useBlockingTaskExecutor) {
ctx.blockingTaskExecutor().execute(() -> {
try {
invokeAsynchronously(impl, func, tArgs, reply);
} catch (Throwable t) {
reply.completeExceptionally(t);
}
});
} else {
invokeAsynchronously(impl, func, tArgs, reply);
}
} else {
invokeSynchronously(ctx, impl, func, tArgs, reply);
}
} catch (Throwable t) {
reply.completeExceptionally(t);
}
}
private static void invokeAsynchronously(Object impl, ThriftFunction func, TBase<?, ?> args,
CompletableRpcResponse reply) throws TException {
final AsyncProcessFunction<Object, TBase<?, ?>, Object> f = func.asyncFunc();
if (func.isOneWay()) {
f.start(impl, args, ONEWAY_CALLBACK);
reply.complete(null);
} else {
f.start(impl, args, new AsyncMethodCallback<Object>() {
@Override
public void onComplete(Object response) {
reply.complete(response);
}
@Override
public void onError(Exception e) {
reply.completeExceptionally(e);
}
});
}
}
private static void invokeSynchronously(
ServiceRequestContext ctx, Object impl,
ThriftFunction func, TBase<?, ?> args, CompletableRpcResponse reply) {
final ProcessFunction<Object, TBase<?, ?>> f = func.syncFunc();
ctx.blockingTaskExecutor().execute(() -> {
if (reply.isDone()) {
// Closed already most likely due to timeout.
return;
}
try {
if (func.isOneWay()) {
reply.complete(null);
f.getResult(impl, args);
} else {
final TBase<?, ?> result = f.getResult(impl, args);
reply.complete(func.getResult(result));
}
} catch (Throwable t) {
if (func.isOneWay()) {
reply.complete(null);
logOneWayFunctionFailure(ctx, t);
} else {
reply.completeExceptionally(t);
}
}
});
}
private static void logOneWayFunctionFailure(@Nullable RequestContext ctx, Throwable cause) {
if (ctx != null) {
logger.warn("{} Unexpected exception from a one-way function:", ctx, cause);
} else {
// Should never reach here, but for completeness.
logger.warn("Unexpected exception from a one-way function:", cause);
}
}
}