-
Notifications
You must be signed in to change notification settings - Fork 2.5k
/
SseEventSourceImpl.java
238 lines (216 loc) · 8.33 KB
/
SseEventSourceImpl.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
package org.jboss.resteasy.reactive.client.impl;
import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.http.HttpClientResponse;
import io.vertx.core.http.HttpConnection;
import io.vertx.core.net.impl.ConnectionBase;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.sse.InboundSseEvent;
import javax.ws.rs.sse.SseEventSource;
import org.jboss.resteasy.reactive.common.util.CommonSseUtil;
public class SseEventSourceImpl implements SseEventSource, Handler<Long> {
private TimeUnit reconnectUnit;
private long reconnectDelay;
private final WebTargetImpl webTarget;
// this tracks user request to open/close
private volatile boolean isOpen;
// this tracks whether we have a connection open
private volatile boolean isInProgress;
private final List<Consumer<InboundSseEvent>> consumers = new ArrayList<>();
private final List<Consumer<Throwable>> errorListeners = new ArrayList<>();
private final List<Runnable> completionListeners = new ArrayList<>();
private HttpConnection connection;
private final SseParser sseParser;
private long timerId = -1;
private boolean receivedClientClose;
public SseEventSourceImpl(WebTargetImpl webTarget, long reconnectDelay, TimeUnit reconnectUnit) {
// tests set a null endpoint
Objects.requireNonNull(reconnectUnit);
if (reconnectDelay <= 0)
throw new IllegalArgumentException("Delay must be > 0: " + reconnectDelay);
this.webTarget = webTarget;
this.reconnectDelay = reconnectDelay;
this.reconnectUnit = reconnectUnit;
this.sseParser = new SseParser(this);
}
WebTargetImpl getWebTarget() {
return webTarget;
}
@Override
public synchronized void register(Consumer<InboundSseEvent> onEvent) {
consumers.add(onEvent);
}
@Override
public synchronized void register(Consumer<InboundSseEvent> onEvent, Consumer<Throwable> onError) {
consumers.add(onEvent);
errorListeners.add(onError);
}
@Override
public synchronized void register(Consumer<InboundSseEvent> onEvent, Consumer<Throwable> onError, Runnable onComplete) {
consumers.add(onEvent);
errorListeners.add(onError);
completionListeners.add(onComplete);
}
@Override
public synchronized void open() {
if (isOpen)
return;
isOpen = true;
connect();
}
// CALL WITH THE LOCK
private void connect() {
if (isInProgress)
return;
isInProgress = true;
// ignore previous client closes
receivedClientClose = false;
AsyncInvokerImpl invoker = (AsyncInvokerImpl) webTarget.request().rx();
RestClientRequestContext restClientRequestContext = invoker.performRequestInternal("GET", null, null, false);
restClientRequestContext.getResult().handle((response, throwable) -> {
// errors during connection don't currently lead to a retry
if (throwable != null) {
receiveThrowable(throwable);
notifyCompletion();
} else if (response.getStatus() != Response.Status.OK.getStatusCode()) {
receiveThrowable(new RuntimeException("HTTP call unsuccessful: " + response.getStatus()));
notifyCompletion();
} else if (!MediaType.SERVER_SENT_EVENTS_TYPE.isCompatible(response.getMediaType())) {
receiveThrowable(
new RuntimeException("HTTP call did not return an SSE media type: " + response.getMediaType()));
notifyCompletion();
} else {
registerOnClient(restClientRequestContext.getVertxClientResponse());
}
return null;
});
}
/**
* Allows the HTTP client to register for SSE after it has made the request
*/
synchronized void registerAfterRequest(HttpClientResponse vertxClientResponse) {
if (isOpen)
throw new IllegalStateException("Was already open");
isOpen = true;
registerOnClient(vertxClientResponse);
}
private void registerOnClient(HttpClientResponse vertxClientResponse) {
// make sure we get exceptions on the response, like close events, otherwise they
// will be logged as errors by vertx
vertxClientResponse.exceptionHandler(t -> {
if (t == ConnectionBase.CLOSED_EXCEPTION) {
// we can ignore this one since we registered a closeHandler
} else {
receiveThrowable(t);
}
});
// since we registered our exception handler, let's remove the request exception handler
// that is set in ClientSendRequestHandler
vertxClientResponse.request().exceptionHandler(null);
connection = vertxClientResponse.request().connection();
String sseContentTypeHeader = vertxClientResponse.getHeader(CommonSseUtil.SSE_CONTENT_TYPE);
sseParser.setSseContentTypeHeader(sseContentTypeHeader);
// we don't add a closeHandler handler on the connection as it can race with this handler
// and close before the emitter emits anything
// see: https://github.com/quarkusio/quarkus/pull/16438
vertxClientResponse.handler(sseParser);
vertxClientResponse.endHandler(v -> {
close(true);
});
vertxClientResponse.resume();
}
private void receiveThrowable(Throwable throwable) {
for (Consumer<Throwable> errorListener : errorListeners) {
errorListener.accept(throwable);
}
}
@Override
public boolean isOpen() {
return isOpen;
}
@Override
public boolean close(long timeout, TimeUnit unit) {
close(false);
return true;
}
private synchronized void close(boolean clientClosed) {
if (!isOpen) {
return;
}
if (clientClosed) {
// do not react more than once on client closing
if (this.receivedClientClose) {
return;
}
}
// it's possible that the client closed our connection, then we registered a reconnect timer
// and then the user is closing us, so we don't have a connection yet
if (connection != null) {
connection.close();
}
connection = null;
isInProgress = false;
boolean notifyCompletion = true;
if (!clientClosed) {
isOpen = false;
if (receivedClientClose) {
// do not notify completion if we already did as part of the client closing
notifyCompletion = false;
}
} else {
receivedClientClose = true;
}
if (notifyCompletion) {
// notify completion before reconnecting
notifyCompletion();
}
Vertx vertx = webTarget.getRestClient().getVertx();
// did we already try to reconnect?
if (timerId != -1) {
// cancel any previous timer
vertx.cancelTimer(timerId);
timerId = -1;
}
// schedule a new reconnect if the client closed us
if (clientClosed) {
timerId = vertx.setTimer(TimeUnit.MILLISECONDS.convert(reconnectDelay, reconnectUnit), this);
}
}
private synchronized void notifyCompletion() {
for (Runnable runnable : completionListeners) {
runnable.run();
}
}
public synchronized void fireEvent(InboundSseEventImpl event) {
// spec says to do this
if (event.isReconnectDelaySet()) {
reconnectDelay = event.getReconnectDelay();
reconnectUnit = TimeUnit.MILLISECONDS;
}
for (Consumer<InboundSseEvent> consumer : consumers) {
consumer.accept(event);
}
}
@Override
public synchronized void handle(Long event) {
// ignore a timeout if it's not the last one we set
if (timerId != event.longValue()) {
return;
}
// also ignore a reconnect order if the user closed this
if (!isOpen) {
return;
}
connect();
}
// For tests
public SseParser getSseParser() {
return sseParser;
}
}