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WebServer.java
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WebServer.java
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/*
* Copyright The Cryostat Authors
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or data
* (collectively the "Software"), free of charge and under any and all copyright
* rights in the Software, and any and all patent rights owned or freely
* licensable by each licensor hereunder covering either (i) the unmodified
* Software as contributed to or provided by such licensor, or (ii) the Larger
* Works (as defined below), to deal in both
*
* (a) the Software, and
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software (each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
* The above copyright notice and either this complete permission notice or at
* a minimum a reference to the UPL must be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package io.cryostat.agent;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.ScheduledExecutorService;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import dagger.Lazy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class WebServer {
private final Logger log = LoggerFactory.getLogger(getClass());
private final ScheduledExecutorService executor;
private final String host;
private final int port;
private final Lazy<Registration> registration;
private HttpServer http;
WebServer(
ScheduledExecutorService executor,
String host,
int port,
Lazy<Registration> registration) {
this.executor = executor;
this.host = host;
this.port = port;
this.registration = registration;
}
void start() throws IOException {
if (this.http != null) {
stop();
}
this.http = com.sun.net.httpserver.HttpServer.create(new InetSocketAddress(host, port), 0);
this.http.setExecutor(executor);
this.http
.createContext("/")
.setHandler(
new HttpHandler() {
@Override
public void handle(HttpExchange exchange) throws IOException {
String mtd = exchange.getRequestMethod();
if ("POST".equals(mtd)) {
executor.execute(registration.get()::tryRegister);
}
log.trace("{} {}: 204", mtd, exchange.getRequestURI());
exchange.sendResponseHeaders(204, -1);
exchange.close();
}
});
this.http.start();
}
void stop() {
if (this.http != null) {
this.http.stop(0);
this.http = null;
}
}
}