in mantis-network/src/main/java/io/reactivex/mantis/network/push/PushServerSse.java [107:324]
public RxServer<?, ?> createServer() {
RxServer<HttpServerRequest<String>, HttpServerResponse<ServerSentEvent>> server = RxNetty.newHttpServerBuilder(port,
new RequestHandler<String, ServerSentEvent>() {
@Override
public Observable<Void> handle(
HttpServerRequest<String> request,
final HttpServerResponse<ServerSentEvent> response) {
final Map<String, List<String>> queryParameters = request.getQueryParameters();
final Counter sseProcessedCounter;
final Counter sseDroppedCounter;
// heartbeat state
boolean enableHeartbeats = false;
boolean enableBinaryOutput = false;
final AtomicLong heartBeatReadIdleSec = new AtomicLong(2);
SerializedSubject<String, String> metaMsgSubject = PublishSubject.<String>create().toSerialized();
final AtomicLong metaMessagesFreqMSec = new AtomicLong(1000);
boolean enableMetaMessages = false;
final AtomicLong lastWriteTime = new AtomicLong();
Subscription heartbeatSubscription = null;
Subscription metaMsgSubscription = null;
// sample state
boolean enableSampling = false;
long samplingTimeMsec = 0;
// client state
String groupId = null;
String slotId = null;
String id = null;
Func1<T, Boolean> predicateFunction = null;
String availabilityZone = null;
if (predicate != null) {
predicateFunction = predicate.call(queryParameters);
}
byte[] delimiter = CompressionUtils.MANTIS_SSE_DELIMITER_BINARY;
if (queryParameters != null && !queryParameters.isEmpty()) {
if (queryParameters.containsKey(MantisSSEConstants.ID)) {
id = queryParameters.get(MantisSSEConstants.ID).get(0);
}
if (queryParameters.containsKey(MantisSSEConstants.SLOT_ID)) {
slotId = queryParameters.get(MantisSSEConstants.SLOT_ID).get(0);
}
// support groupId and clientId for grouping
if (queryParameters.containsKey(MantisSSEConstants.GROUP_ID)) {
groupId = queryParameters.get(MantisSSEConstants.GROUP_ID).get(0);
}
if (queryParameters.containsKey(MantisSSEConstants.CLIENT_ID)) {
groupId = queryParameters.get(MantisSSEConstants.CLIENT_ID).get(0);
}
if (queryParameters.containsKey(MantisSSEConstants.HEARTBEAT_SEC)) {
heartBeatReadIdleSec.set(Long.parseLong(queryParameters.get(MantisSSEConstants.HEARTBEAT_SEC).get(0)));
if (heartBeatReadIdleSec.get() < 1) {
throw new IllegalArgumentException("Sampling rate too low: " + samplingTimeMsec);
}
enableHeartbeats = true;
}
if (queryParameters.containsKey(MantisSSEConstants.MANTIS_ENABLE_COMPRESSION)) {
String enableBinaryOutputStr = queryParameters.get(MantisSSEConstants.MANTIS_ENABLE_COMPRESSION).get(0);
if ("true".equalsIgnoreCase(enableBinaryOutputStr)) {
logger.info("Binary compression requested");
enableBinaryOutput = true;
}
}
if (queryParameters.containsKey(MantisSSEConstants.ENABLE_PINGS)) {
String enablePings = queryParameters.get(MantisSSEConstants.ENABLE_PINGS).get(0);
if ("true".equalsIgnoreCase(enablePings)) {
enableHeartbeats = true;
}
}
if (queryParameters.containsKey(MantisSSEConstants.ENABLE_META_MESSAGES)) {
String enableMetaMessagesStr = queryParameters.get(MantisSSEConstants.ENABLE_META_MESSAGES).get(0);
if ("true".equalsIgnoreCase(enableMetaMessagesStr)) {
enableMetaMessages = true;
}
}
if (queryParameters.containsKey(MantisSSEConstants.META_MESSAGES_SEC)) {
metaMessagesFreqMSec.set(Long.parseLong(queryParameters.get(MantisSSEConstants.META_MESSAGES_SEC).get(0)));
if (metaMessagesFreqMSec.get() < 250) {
throw new IllegalArgumentException("Meta message frequence rate too low: " + metaMessagesFreqMSec.get());
}
enableMetaMessages = true;
}
if (queryParameters.containsKey(MantisSSEConstants.SAMPLE)) {
samplingTimeMsec = Long.parseLong(queryParameters.get(MantisSSEConstants.SAMPLE).get(0)) * 1000;
if (samplingTimeMsec < 50) {
throw new IllegalArgumentException("Sampling rate too low: " + samplingTimeMsec);
}
enableSampling = true;
}
if (queryParameters.containsKey(MantisSSEConstants.SAMPLE_M_SEC)) {
samplingTimeMsec = Long.parseLong(queryParameters.get(MantisSSEConstants.SAMPLE_M_SEC).get(0));
if (samplingTimeMsec < 50) {
throw new IllegalArgumentException("Sampling rate too low: " + samplingTimeMsec);
}
enableSampling = true;
}
if (queryParameters.containsKey(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER)) {
String rawDelimiter = queryParameters.get(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER).get(0);
if (rawDelimiter != null && !rawDelimiter.isEmpty()) {
delimiter = rawDelimiter.getBytes();
}
}
if (queryParameters.containsKey(MantisSSEConstants.MQL)) {
String query = queryParameters.get(MantisSSEConstants.MQL).get(0);
if (MQLServer.parses(query)) {
Query q = MQLServer.parse(query);
predicateFunction = (T datum) -> datum instanceof Map ? q.matches((Map) datum) : true;
}
}
if (queryParameters.containsKey(MantisSSEConstants.AVAILABILITY_ZONE)) {
availabilityZone = queryParameters.get(MantisSSEConstants.AVAILABILITY_ZONE).get(0);
}
}
InetSocketAddress socketAddress = (InetSocketAddress) response.getChannel().remoteAddress();
Metrics metrics;
if (groupId == null) {
String address = socketAddress.getAddress().toString();
metrics = registerSseMetrics(address, address);
} else {
metrics = registerSseMetrics(groupId, socketAddress.getAddress().toString());
}
sseProcessedCounter = metrics.getCounter(PROCESSED_COUNTER_METRIC_NAME);
sseDroppedCounter = metrics.getCounter(DROPPED_COUNTER_METRIC_NAME);
response.getHeaders().set("Access-Control-Allow-Origin", "*");
response.getHeaders().set("content-type", "text/event-stream");
response.getHeaders().set("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate");
response.getHeaders().set("Pragma", "no-cache");
response.flush();
if (queryParameters != null && requestPreprocessor != null) {
requestPreprocessor.call(queryParameters, processorState);
}
if (enableMetaMessages && metaMessagesFreqMSec.get() > 0) {
logger.info("Enabling Meta messages, interval : " + metaMessagesFreqMSec.get() + " ms");
metaMsgSubscription = metaMsgSubject
.throttleLast(metaMessagesFreqMSec.get(), TimeUnit.MILLISECONDS)
.doOnNext((String t) -> {
if (t != null && !t.isEmpty()) {
long currentTime = System.currentTimeMillis();
ByteBuf data = response.getAllocator().buffer().writeBytes(t.getBytes());
response.writeAndFlush(new ServerSentEvent(data));
lastWriteTime.set(currentTime);
}
}
).subscribe();
}
if (enableHeartbeats && heartBeatReadIdleSec.get() > 0) {
logger.info("Enabling hearts, interval: " + heartBeatReadIdleSec);
heartbeatSubscription = Observable
.interval(2, heartBeatReadIdleSec.get(), TimeUnit.SECONDS)
.doOnNext((Long t1) -> {
long currentTime = System.currentTimeMillis();
long diff = (currentTime - lastWriteTime.get()) / 1000;
if (diff > heartBeatReadIdleSec.get()) {
ByteBuf data = response.getAllocator().buffer().writeBytes("ping".getBytes());
response.writeAndFlush(new ServerSentEvent(data));
lastWriteTime.set(currentTime);
}
}
).subscribe();
}
Action0 connectionClosedCallback = null;
if (queryParameters != null && requestPostprocessor != null) {
connectionClosedCallback = new Action0() {
@Override
public void call() {
requestPostprocessor.call(queryParameters, processorState);
}
};
}
class SubscribeCallback implements Action0 {
@Override
public void call() {
if (queryParameters != null && subscribeProcessor != null) {
subscribeProcessor.call(queryParameters, processorState);
}
}
}
return manageConnectionWithCompression(response, socketAddress.getHostString(), socketAddress.getPort(), groupId,
slotId, id, lastWriteTime,
enableHeartbeats, heartbeatSubscription, enableSampling, samplingTimeMsec, metaMsgSubject, metaMsgSubscription,
predicateFunction, connectionClosedCallback, sseProcessedCounter,
sseDroppedCounter,
new SubscribeCallback(), enableBinaryOutput, true, delimiter, availabilityZone);
}
})
.pipelineConfigurator(PipelineConfigurators.serveSseConfigurator())
.channelOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(1024 * 1024, 5 * 1024 * 1024))
.build();
return server;
}