com.danielflower.apprunner.router.web.ReverseProxyManager Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of app-runner-router Show documentation
Show all versions of app-runner-router Show documentation
A reverse proxy for AppRunner that allows you horizontally scale AppRunner
package com.danielflower.apprunner.router.web;
import com.danielflower.apprunner.router.mgmt.Cluster;
import com.danielflower.apprunner.router.mgmt.Runner;
import com.danielflower.apprunner.router.monitoring.AppRequestListener;
import com.danielflower.apprunner.router.monitoring.RequestInfo;
import io.muserver.Method;
import io.muserver.MuRequest;
import io.muserver.MuResponse;
import io.muserver.Mutils;
import io.muserver.murp.ProxyCompleteListener;
import io.muserver.murp.UriMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.URI;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ReverseProxyManager implements UriMapper, ProxyCompleteListener {
public static final Logger log = LoggerFactory.getLogger(ReverseProxyManager.class);
private static final Pattern APP_WEB_REQUEST = Pattern.compile("/([^/?]+)(.*)");
private static final Pattern APP_API_REQUEST = Pattern.compile("/api/v1/apps/([^/?]+)(.*)");
private static final String REQUEST_INFO_NAME = "info";
private final ProxyMap proxyMap;
private final Cluster cluster;
private final AppRequestListener appRequestListener;
public ReverseProxyManager(Cluster cluster, ProxyMap proxyMap, AppRequestListener appRequestListener) {
this.cluster = cluster;
this.proxyMap = proxyMap;
this.appRequestListener = appRequestListener;
}
public URI mapFrom(MuRequest clientRequest) {
RequestInfo requestInfo = attachInfoForMonitoring(clientRequest);
String uri = clientRequest.uri().getRawPath();
String query = Mutils.nullOrEmpty(clientRequest.uri().getRawQuery()) ? "" : "?" + clientRequest.uri().getRawQuery();
requestInfo.url = clientRequest.uri().toString();
if (uri.startsWith("/api/")) {
URI target = apiTargetUri(uri, query);
requestInfo.appName = "api";
if (target != null) {
requestInfo.targetHost = target.getAuthority();
log.info("Proxying to " + target);
return target;
}
} else {
Matcher appMatcher = APP_WEB_REQUEST.matcher(uri);
if (appMatcher.matches()) {
String prefix = appMatcher.group(1);
requestInfo.appName = prefix;
URI url = proxyMap.get(prefix);
if (url != null) {
requestInfo.targetHost = url.getAuthority();
URI newTarget = url.resolve("/" + prefix + appMatcher.group(2) + query);
log.info("Proxying to " + newTarget);
return newTarget;
}
}
}
log.info("No proxy target configured for " + uri);
return null;
}
private URI apiTargetUri(String uri, String query) {
if (uri.equals("/api/v1/swagger.json") || uri.startsWith("/api/v1/system")) {
List runners = cluster.getRunners();
if (runners.size() > 0) {
return runners.get(0).url.resolve(uri);
}
} else {
Matcher appMatcher = APP_API_REQUEST.matcher(uri);
if (appMatcher.matches()) {
String appName = appMatcher.group(1);
URI url = proxyMap.get(appName);
if (url != null) {
return url.resolve(uri + query);
}
}
}
return null;
}
private static RequestInfo attachInfoForMonitoring(MuRequest clientRequest) {
RequestInfo info = new RequestInfo();
info.startTime = System.currentTimeMillis();
info.remoteAddr = clientRequest.remoteAddress();
info.method = clientRequest.method().name();
clientRequest.attribute(REQUEST_INFO_NAME, info);
return info;
}
static RequestInfo getInfo(MuRequest request) {
return (RequestInfo) request.attribute(REQUEST_INFO_NAME);
}
private static boolean isAppDeletionPost(MuRequest clientRequest) {
String uri = clientRequest.uri().getPath();
String prefix = "/api/v1/apps/";
return clientRequest.method() == Method.DELETE
&& uri.startsWith(prefix) && uri.lastIndexOf('/') == (prefix.length() - 1);
}
@Override
public void onComplete(MuRequest clientRequest, MuResponse clientResponse, URI targetUri, long durationInMillis) throws Exception {
int status = clientResponse.status();
if (isAppDeletionPost(clientRequest) && status == 200) {
String path = clientRequest.uri().getPath();
String appName = path.substring(path.lastIndexOf('/') + 1);
proxyMap.remove(appName);
cluster.getRunnerByURL(targetUri).ifPresent(runner -> {
log.info("Decrementing app count for " + runner.id + " because " + appName + " was deleted.");
runner.refreshRunnerCountCache(proxyMap.getAll());
});
}
if (appRequestListener != null) {
RequestInfo info = getInfo(clientRequest);
if (info != null) {
info.endTime = System.currentTimeMillis();
info.responseStatus = status;
appRequestListener.onRequestComplete(info);
}
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy