cz.o2.proxima.client.IngestClient Maven / Gradle / Ivy
/**
* Copyright 2017-2020 O2 Czech Republic, a.s.
*
* 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 cz.o2.proxima.client;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Strings;
import com.google.protobuf.ByteString;
import com.google.protobuf.TextFormat;
import cz.o2.proxima.proto.service.IngestServiceGrpc;
import cz.o2.proxima.proto.service.IngestServiceGrpc.IngestServiceStub;
import cz.o2.proxima.proto.service.RetrieveServiceGrpc;
import cz.o2.proxima.proto.service.Rpc;
import io.grpc.Channel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.stub.StreamObserver;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;
import javax.annotation.Nullable;
import lombok.Getter;
import lombok.Value;
import lombok.extern.slf4j.Slf4j;
/** A client being able to connect and write requests to the ingest gateway. */
@Slf4j
public class IngestClient implements AutoCloseable {
/** Request sent through the channel */
@Value
private class Request {
final Consumer consumer;
final ScheduledFuture timeoutFuture;
final Rpc.Ingest payload;
/**
* Confirm the status and remove the timeout schedule
*
* @param status of the request
*/
private void setStatus(Rpc.Status status) {
if (timeoutFuture == null || timeoutFuture.cancel(false)) {
consumer.accept(status);
}
}
/** Retry to send the request. */
void retry() {
// we don't setup any timeout
sendTry(payload, -1L, TimeUnit.MILLISECONDS, consumer, true);
}
}
/**
* Create {@link IngestClient} instance
*
* @param host of the ingest server
* @param port of the ingest server
* @return ingest client
*/
public static IngestClient create(String host, int port) {
return create(host, port, new Options());
}
/**
* Create {@link IngestClient} instance
*
* @param host of the ingest server
* @param port of the ingest server
* @param opts extra settings
* @return ingest client
*/
public static IngestClient create(String host, int port, Options opts) {
return new IngestClient(host, port, opts);
}
@Getter private final String host;
@Getter private final int port;
@Getter private final Options options;
/** Map of UUID of message to the consumer of the message status. */
private final Map inFlightRequests;
@VisibleForTesting Channel channel = null;
@VisibleForTesting IngestServiceStub ingestStub = null;
@VisibleForTesting RetrieveServiceGrpc.RetrieveServiceBlockingStub retrieveStub = null;
private final Rpc.IngestBulk.Builder bulkBuilder = Rpc.IngestBulk.newBuilder();
private final CountDownLatch closedLatch = new CountDownLatch(1);
@VisibleForTesting final StreamObserver statusObserver = newStatusObserver();
private Thread flushThread;
private final AtomicReference flushThreadExc = new AtomicReference<>();
@VisibleForTesting StreamObserver ingestRequestObserver;
private final ScheduledThreadPoolExecutor timer = new ScheduledThreadPoolExecutor(1);
private long lastFlush = System.nanoTime();
@VisibleForTesting
IngestClient(String host, int port, Options options) {
this.host = host;
this.port = port;
this.options = options;
this.inFlightRequests = Collections.synchronizedMap(new HashMap<>());
this.flushThread = createFlushThread();
}
private Thread createFlushThread() {
Thread ret =
new Thread(
() -> {
try {
long flushTimeNanos = options.getFlushUsec() * 1_000L;
while (!Thread.currentThread().isInterrupted()) {
flushLoop(flushTimeNanos);
}
} catch (Throwable thwbl) {
log.error("Error in flush thread", thwbl);
flushThreadExc.set(thwbl);
}
});
ret.setDaemon(true);
ret.setName(getClass().getSimpleName() + "-flushThread");
return ret;
}
private void flushLoop(long flushTimeNanos) {
try {
long nowNanos = System.nanoTime();
long waitTimeNanos = flushTimeNanos - nowNanos + lastFlush;
synchronized (this) {
if (waitTimeNanos > 0) {
wait(waitTimeNanos / 1_000_000L, (int) (waitTimeNanos % 1_000_000L));
}
}
synchronized (IngestClient.this) {
flush();
}
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
private StreamObserver newStatusObserver() {
return new StreamObserver() {
@Override
public void onNext(Rpc.StatusBulk bulk) {
for (Rpc.Status status : bulk.getStatusList()) {
final String uuid = status.getUuid();
final Request request = inFlightRequests.remove(uuid);
if (request == null) {
log.warn(
"Received response for unknown message {}", TextFormat.shortDebugString(status));
} else {
synchronized (inFlightRequests) {
inFlightRequests.notifyAll();
}
request.setStatus(status);
}
}
}
@Override
public void onError(Throwable thrwbl) {
IngestClient.this.onError(thrwbl);
}
@Override
public void onCompleted() {
synchronized (inFlightRequests) {
inFlightRequests.clear();
}
closedLatch.countDown();
}
};
}
private synchronized void onError(Throwable thrwbl) {
ingestStub = null;
try {
log.warn("Error on channel, closing ingestStub", thrwbl);
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException ex) {
log.warn("Interrupted while waiting before channel open retry.", ex);
Thread.currentThread().interrupt();
}
createChannelAndStub();
}
/**
* Send the request.
*
* @param ingest the data
* @param statusConsumer callback for receiving status
*/
public void send(Rpc.Ingest ingest, Consumer statusConsumer) {
send(ingest, -1, TimeUnit.SECONDS, statusConsumer);
}
/**
* Send the request with timeout.
*
* @param ingest the data
* @param timeout timeout
* @param unit time unit of timeout
* @param statusConsumer callback for receiving status
*/
public void send(
Rpc.Ingest ingest, long timeout, TimeUnit unit, Consumer statusConsumer) {
sendTry(ingest, timeout, unit, statusConsumer, false);
}
/**
* Send ingest request.
*
* @param key entity key value.
* @param entity entity name.
* @param attribute attribute name.
* @param value ingested value.
* @param statusConsumer callback for receiving status.
*/
public void ingest(
String key,
String entity,
String attribute,
ByteString value,
Consumer statusConsumer) {
ingest(
UUID.randomUUID().toString(),
key,
entity,
attribute,
value,
System.currentTimeMillis(),
statusConsumer);
}
/**
* Send ingest request.
*
* @param uuid request UUID.
* @param key entity key value.
* @param entity entity name.
* @param attribute attribute name.
* @param value ingested value.
* @param statusConsumer callback for receiving status.
*/
public void ingest(
String uuid,
String key,
String entity,
String attribute,
ByteString value,
Consumer statusConsumer) {
ingest(uuid, key, entity, attribute, value, System.currentTimeMillis(), statusConsumer);
}
/**
* Send ingest request.
*
* @param uuid request UUID.
* @param key entity key value.
* @param entity entity name.
* @param attribute attribute name.
* @param value attribute value
* @param stamp timestamp.
* @param statusConsumer callback for receiving status.
*/
public void ingest(
String uuid,
String key,
String entity,
String attribute,
@Nullable ByteString value,
long stamp,
Consumer statusConsumer) {
Rpc.Ingest.Builder requestBuilder =
Rpc.Ingest.newBuilder()
.setUuid(uuid)
.setKey(key)
.setEntity(entity)
.setAttribute(attribute)
.setStamp(stamp);
if (value == null) {
requestBuilder.setDelete(true);
} else {
requestBuilder.setValue(value);
}
send(requestBuilder.build(), statusConsumer);
}
/**
* Send delete request.
*
* @param uuid request UUID.
* @param key entity key value.
* @param entity entity name.
* @param attribute attribute name.
* @param stamp timestamp.
* @param statusConsumer callback for receiving status.
*/
public void delete(
String uuid,
String key,
String entity,
String attribute,
long stamp,
Consumer statusConsumer) {
ingest(uuid, key, entity, attribute, null, stamp, statusConsumer);
}
/**
* Send delete request.
*
* @param key entity key value.
* @param entity entity name.
* @param attribute attribute name.
* @param statusConsumer callback for receiving status.
*/
public void delete(
String key, String entity, String attribute, Consumer statusConsumer) {
delete(
UUID.randomUUID().toString(),
key,
entity,
attribute,
System.currentTimeMillis(),
statusConsumer);
}
/**
* Send delete request.
*
* @param uuid request UUID.
* @param key entity key value.
* @param entity entity name.
* @param attribute attribute name.
* @param statusConsumer callback for receiving status.
*/
public void delete(
String uuid,
String key,
String entity,
String attribute,
Consumer statusConsumer) {
delete(uuid, key, entity, attribute, System.currentTimeMillis(), statusConsumer);
}
/**
* Sends synchronously {@link cz.o2.proxima.proto.service.Rpc.GetRequest} to retrieve data from
* the system.
*
* @param request Instance of {@link cz.o2.proxima.proto.service.Rpc.GetRequest}.
* @return Instance of {@link cz.o2.proxima.proto.service.Rpc.GetResponse}.
*/
public Rpc.GetResponse get(Rpc.GetRequest request) {
ensureChannel();
return retrieveStub.get(request);
}
/**
* Sends synchronously {@link cz.o2.proxima.proto.service.Rpc.GetRequest} to retrieve data from
* system.
*
* @param entity entity name.
* @param key entity key.
* @param attribute attribute name.
* @return Instance of {@link cz.o2.proxima.proto.service.Rpc.GetResponse}.
*/
public Rpc.GetResponse get(String entity, String key, String attribute) {
Rpc.GetRequest get =
Rpc.GetRequest.newBuilder().setEntity(entity).setKey(key).setAttribute(attribute).build();
return get(get);
}
/**
* Send synchronously {@link cz.o2.proxima.proto.service.Rpc.ListRequest} to retrieve attributes
* for entity.
*
* @param request Instance of {@link cz.o2.proxima.proto.service.Rpc.ListRequest}.
* @return Instance of {@link cz.o2.proxima.proto.service.Rpc.ListResponse}.
*/
public Rpc.ListResponse listAttributes(Rpc.ListRequest request) {
ensureChannel();
return retrieveStub.listAttributes(request);
}
/**
* Send synchronously {@link cz.o2.proxima.proto.service.Rpc.ListRequest} to retrieve attributes
* for entity.
*
* @param entity entity name
* @param key entity key value.
* @return Instance of {@link cz.o2.proxima.proto.service.Rpc.ListResponse}.
*/
public Rpc.ListResponse listAttributes(String entity, String key) {
return listAttributes(entity, key, null, -1);
}
/**
* Send synchronously {@link cz.o2.proxima.proto.service.Rpc.ListRequest} to retrieve attributes
* for entity.
*
* @param entity entity name
* @param key entity key value.
* @param offset random offset.
* @param limit limit of values (-1 for all).
* @return Instance of {@link cz.o2.proxima.proto.service.Rpc.ListResponse}.
*/
public Rpc.ListResponse listAttributes(
String entity, String key, @Nullable String offset, int limit) {
Rpc.ListRequest.Builder list =
Rpc.ListRequest.newBuilder().setEntity(entity).setKey(key).setLimit(limit);
if (offset != null) {
list.setOffset(offset);
}
return listAttributes(list.build());
}
/** Send the request with timeout. */
private void sendTry(
Rpc.Ingest ingest,
long timeout,
TimeUnit unit,
Consumer statusConsumer,
boolean isRetry) {
if (Strings.isNullOrEmpty(ingest.getUuid())) {
throw new IllegalArgumentException(
"UUID cannot be null, because it is used to confirm messages.");
}
synchronized (this) {
ensureChannel();
Throwable flushExc = flushThreadExc.getAndSet(null);
if (flushExc != null) {
log.warn("Received exception from flush thread. Restarting flush thread.", flushExc);
try {
flushThread.join(500);
} catch (InterruptedException ex) {
log.warn("Interrupted while waiting for flushThread join.");
Thread.currentThread().interrupt();
}
flushThread = createFlushThread();
onError(flushExc);
}
if (!flushThread.isAlive()) {
flushThread.start();
}
}
ScheduledFuture scheduled = null;
if (timeout > 0) {
scheduled =
timer.schedule(
() -> {
inFlightRequests.remove(ingest.getUuid());
statusConsumer.accept(
Rpc.Status.newBuilder()
.setStatus(504)
.setStatusMessage(
"Timeout while waiting for response of request UUID "
+ ingest.getUuid())
.build());
},
timeout,
unit);
}
while (!isRetry && inFlightRequests.size() >= options.getMaxInflightRequests()) {
synchronized (inFlightRequests) {
try {
inFlightRequests.wait(100);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
statusConsumer.accept(
Rpc.Status.newBuilder()
.setStatus(417)
.setStatusMessage("Interrupted while waiting for the requests to settle")
.build());
return;
}
}
}
inFlightRequests.putIfAbsent(ingest.getUuid(), new Request(statusConsumer, scheduled, ingest));
synchronized (this) {
bulkBuilder.addIngest(ingest);
if (bulkBuilder.getIngestCount() >= options.getMaxFlushRecords()) {
flush();
}
}
}
@VisibleForTesting
synchronized void createChannelAndStub() {
if (channel == null) {
channel =
ManagedChannelBuilder.forAddress(host, port)
.usePlaintext()
.executor(options.getExecutor())
.build();
}
retrieveStub = RetrieveServiceGrpc.newBlockingStub(channel);
ingestStub = IngestServiceGrpc.newStub(channel);
ingestRequestObserver = ingestStub.ingestBulk(statusObserver);
synchronized (inFlightRequests) {
inFlightRequests.values().forEach(Request::retry);
}
}
private void ensureChannel() {
if (channel == null) {
createChannelAndStub();
}
}
@Override
public void close() {
final boolean channelNotNull;
synchronized (this) {
flush();
channelNotNull = channel != null;
}
if (channelNotNull) {
while (!inFlightRequests.isEmpty()) {
synchronized (inFlightRequests) {
try {
inFlightRequests.wait(100);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
break;
}
}
}
synchronized (this) {
ingestRequestObserver.onCompleted();
}
flushThread.interrupt();
try {
if (!closedLatch.await(1, TimeUnit.SECONDS)) {
log.warn("Unable to await for flushThreads");
}
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
channel = null;
}
}
private synchronized void flush() {
if (bulkBuilder.getIngestCount() > 0) {
if (ingestRequestObserver != null) {
ingestRequestObserver.onNext(bulkBuilder.build());
} else {
log.warn("Cannot send bulk due to null observer. " + "This might suggest bug in code.");
}
bulkBuilder.clear();
}
lastFlush = System.nanoTime();
}
}
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