@GET
@ApiOperation(
value = "Subscribe Event Stream",
consumes = "text/event-stream",
produces = "text/event-stream",
authorizations = @Authorization(value = "read_key"),
notes = "Subscribes the event stream.")
@ApiResponses(value = {@ApiResponse(code = 400, message = "Project does not exist.")})
@Path("/subscribe")
@IgnorePermissionCheck
@IgnoreApi
public void subscribe(RakamHttpRequest request) {
if (!Objects.equals(request.headers().get(HttpHeaders.Names.ACCEPT), "text/event-stream")) {
request
.response(
"the response should accept text/event-stream", HttpResponseStatus.NOT_ACCEPTABLE)
.end();
return;
}
RakamHttpRequest.StreamResponse response = request.streamResponse();
List<String> data = request.params().get("data");
if (data == null || data.isEmpty()) {
response
.send(
"result",
encode(
errorMessage("data query parameter is required", HttpResponseStatus.BAD_REQUEST)))
.end();
return;
}
StreamQuery query;
try {
query = JsonHelper.readSafe(data.get(0), StreamQuery.class);
} catch (IOException e) {
response
.send(
"result",
encode(errorMessage("json couldn't parsed", HttpResponseStatus.BAD_REQUEST)))
.end();
return;
}
List<String> api_key = request.params().get("api_key");
if (api_key == null
|| api_key.isEmpty()
|| !metastore.checkPermission(
query.project, Metastore.AccessKeyType.READ_KEY, api_key.get(0))) {
response.send("result", HttpResponseStatus.UNAUTHORIZED.reasonPhrase()).end();
return;
}
List<CollectionStreamQuery> collect;
try {
collect =
query
.collections
.stream()
.map(
collection -> {
Expression expression = null;
try {
expression =
collection.filter == null
? null
: sqlParser.createExpression(collection.filter);
} catch (ParsingException e) {
ObjectNode obj =
errorMessage(
format(
"Couldn't parse %s: %s", collection.filter, e.getErrorMessage()),
HttpResponseStatus.BAD_REQUEST);
request.response(encode(obj)).end();
throw e;
}
return new CollectionStreamQuery(
collection.name, expression == null ? null : expression.toString());
})
.collect(Collectors.toList());
} catch (ParsingException e) {
return;
}
EventStream.EventStreamer subscribe =
stream.subscribe(
query.project, collect, query.columns, new StreamResponseAdapter(response));
eventLoopGroup.schedule(
new Runnable() {
@Override
public void run() {
if (response.isClosed()) {
subscribe.shutdown();
} else {
subscribe.sync();
eventLoopGroup.schedule(this, 3, TimeUnit.SECONDS);
}
}
},
3,
TimeUnit.SECONDS);
}
private void notAuthorised(HttpServerResponse response) {
response.setStatusCode(HttpResponseStatus.UNAUTHORIZED.code());
response.setStatusMessage(HttpResponseStatus.UNAUTHORIZED.reasonPhrase());
response.end();
}