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ProxyResource.java
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ProxyResource.java
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package com.hubspot.singularity.proxy;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.name.Named;
import com.hubspot.horizon.AsyncHttpClient;
import com.hubspot.horizon.Header;
import com.hubspot.horizon.HttpRequest;
import com.hubspot.horizon.HttpRequest.Method;
import com.hubspot.horizon.HttpResponse;
import com.hubspot.singularity.config.ApiPaths;
import com.hubspot.singularity.config.ClusterCoordinatorConfiguration;
import com.hubspot.singularity.config.DataCenter;
import io.dropwizard.server.SimpleServerFactory;
public class ProxyResource {
private static final Logger LOG = LoggerFactory.getLogger(ProxyResource.class);
private AsyncHttpClient httpClient;
private ClusterCoordinatorConfiguration configuration;
private ObjectMapper objectMapper;
protected DataCenterLocator dataCenterLocator;
private String contextPath;
public ProxyResource() {}
@Inject
void injectProxyDeps(ClusterCoordinatorConfiguration configuration,
@Named(SingularityClusterCoodinatorResourcesModule.ASYNC_HTTP_CLIENT) AsyncHttpClient httpClient,
ObjectMapper objectMapper,
DataCenterLocator dataCenterLocator) {
this.configuration = configuration;
this.httpClient = httpClient;
this.objectMapper = objectMapper;
this.dataCenterLocator = dataCenterLocator;
String baseContextPath = ((SimpleServerFactory) configuration.getServerFactory()).getApplicationContextPath();
if (baseContextPath.startsWith("/")) {
baseContextPath = baseContextPath.substring(1, baseContextPath.length());
}
if (baseContextPath.endsWith("/")) {
baseContextPath = baseContextPath.substring(0, baseContextPath.length() -1);
}
this.contextPath = baseContextPath + ApiPaths.API_BASE_PATH;
}
/*
* For items where the dataCenter is part of the object, or where a full list is desired.
* Collect and merge results from each configured dataCenter
*/
public <T> Response getMergedListResult(HttpServletRequest request) {
return getMergedListResult(request, null);
}
public <T> Response getMergedListResult(HttpServletRequest request, T body) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
// TODO - parallelize
List<Object> combined = Lists.newArrayList();
ResponseBuilder builder = null;
for (DataCenter dataCenter : configuration.getDataCenters()) {
try {
HttpResponse response = proxyAndGetResponse(dataCenter, request, body, headers, params);
if (builder == null) {
builder = Response.status(response.getStatusCode());
for (Header header : response.getHeaders()) {
builder.header(header.getName(), header.getValue());
}
}
List<Object> content = response.getAs(new TypeReference<List<Object>>() {});
LOG.trace("Data center {} had response {}", dataCenter.getName(), content);
combined.addAll(content);
} catch (RuntimeException re) {
LOG.error("Could not get data from dataCenter {}, omitting", dataCenter.getName(), re);
}
}
if (builder != null) {
return builder.entity(combined).build();
} else {
throw new WebApplicationException("Got no results", 500);
}
}
/*
* Route a request to a particular dataCenter using the requestId to locate the correct Singularity cluster
*/
public Response routeByRequestId(HttpServletRequest request, String requestId) {
return routeByRequestId(request, requestId, null);
}
public <T> Response routeByRequestId(HttpServletRequest request, String requestId, T body) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = getDataCenterForRequest(requestId);
return toResponse(proxyAndGetResponse(dataCenter, request, body, headers, params));
}
/*
* Route a request to a particular dataCenter using the request group Id to locate the correct Singularity cluster
*/
Response routeByRequestGroupId(HttpServletRequest request, String requestGroupId) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = getDataCenterForRequestGroup(requestGroupId);
return toResponse(proxyAndGetResponse(dataCenter, request, null, headers, params));
}
/*
* Route a request to a particular dataCenter using the slaveId/hostname to locate the correct Singularity cluster
*/
Response routeBySlaveId(HttpServletRequest request, String slaveId) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = getDataCenterForSlaveId(slaveId);
return toResponse(proxyAndGetResponse(dataCenter, request, null, headers, params));
}
Response routeByHostname(HttpServletRequest request, String hostname) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = getDataCenterForSlaveHostname(hostname);
return toResponse(proxyAndGetResponse(dataCenter, request, null, headers, params));
}
/*
* Route a request to a particular dataCenter using the rack ID to locate the correct Singularity cluster
*/
Response routeByRackId(HttpServletRequest request, String rackId) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = getDataCenterForRackId(rackId);
return toResponse(proxyAndGetResponse(dataCenter, request, null, headers, params));
}
/*
* Route a request to a particular dataCenter by name, failing if it is not present
*/
<T> Response routeByDataCenter(HttpServletRequest request, String dataCenterName, T body) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = getDataCenter(dataCenterName);
return toResponse(proxyAndGetResponse(dataCenter, request, body, headers, params));
}
/*
* Route to the default Singularity cluster
*/
Response routeToDefaultDataCenter(HttpServletRequest request) {
return routeToDefaultDataCenter(request, null);
}
<T> Response routeToDefaultDataCenter(HttpServletRequest request, T body) {
List<Param> headers = getHeaders(request);
List<Param> params = getParams(request);
DataCenter dataCenter = configuration.getDataCenters().get(0);
return toResponse(proxyAndGetResponse(dataCenter, request, body, headers, params));
}
/*
* Working with data centers
*/
private String getHost(DataCenter dataCenter) {
return dataCenterLocator.getHost(dataCenter);
}
private DataCenter getDataCenterForRequest(String requestId) {
return dataCenterLocator.getDataCenterForRequest(requestId);
}
private DataCenter getDataCenterForRequestGroup(String requestGroupId) {
return dataCenterLocator.getDataCenterForRequestGroup(requestGroupId);
}
private DataCenter getDataCenterForSlaveId(String slaveId) {
return dataCenterLocator.getDataCenterForSlaveId(slaveId);
}
private DataCenter getDataCenterForSlaveHostname(String hostname) {
return dataCenterLocator.getDataCenterForSlaveHostname(hostname);
}
private DataCenter getDataCenterForRackId(String rackId) {
return dataCenterLocator.getDataCenterForRackId(rackId);
}
private DataCenter getDataCenter(String name) {
return dataCenterLocator.getDataCenter(name);
}
/*
* Generic methods for proxying requests
*/
private <T> HttpResponse proxyAndGetResponse(DataCenter dc, HttpServletRequest request, T body, List<Param> headers, List<Param> params) {
String fullPath = request.getContextPath() + request.getPathInfo();
String url = String.format("%s://%s%s", dc.getScheme(), getHost(dc), fullPath.replace(contextPath, dc.getContextPath()));
LOG.debug("Proxying {} to: {}", fullPath, url);
HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
.setMethod(Method.valueOf(request.getMethod()))
.setUrl(url);
try {
if (body != null) {
requestBuilder.setBody(objectMapper.writeValueAsBytes(body));
LOG.trace("Added body {} to request", body);
}
} catch (JsonProcessingException jpe) {
LOG.error("Could not write body from object {}", body);
throw new WebApplicationException(jpe, 500);
}
headers.forEach((h) -> requestBuilder.addHeader(h.getKey(), h.getValue()));
params.forEach((h) -> requestBuilder.setQueryParam(h.getKey()).to(h.getValue()));
try {
return httpClient.execute(requestBuilder.build()).get();
} catch (InterruptedException|ExecutionException ioe) {
throw new WebApplicationException(ioe);
}
}
private <T, Q> T proxyAndGetResponseAs(DataCenter dc, HttpServletRequest request, Q body, TypeReference<T> clazz, List<Param> headers, List<Param> params) {
HttpResponse response = proxyAndGetResponse(dc, request, body, headers, params);
if (response.getStatusCode() > 399) {
throw new WebApplicationException(response.getAsString(), response.getStatusCode());
} else {
try {
T object = response.getAs(clazz);
LOG.trace("Got response: {}", object);
return object;
} catch (RuntimeException e) {
LOG.error("Could not parse response json", e);
throw new WebApplicationException(e);
}
}
}
private List<Param> getHeaders(HttpServletRequest request) {
List<Param> headers = new ArrayList<>();
Enumeration<String> headerNames = request.getHeaderNames();
if (headerNames != null) {
while (headerNames.hasMoreElements()) {
String headerName = headerNames.nextElement();
headers.add(new Param(headerName, request.getHeader(headerName)));
}
}
LOG.trace("Found headers: {}", headers);
return headers;
}
private List<Param> getParams(HttpServletRequest request) {
List<Param> params = new ArrayList<>();
for (Map.Entry<String, String[]> entry : request.getParameterMap().entrySet()) {
for (String value : entry.getValue()) {
params.add(new Param(entry.getKey(), value));
}
}
LOG.trace("Found params {}", params);
return params;
}
private Response toResponse(HttpResponse original) {
ResponseBuilder builder = Response.status(original.getStatusCode())
.entity(original.getAsString());
original.getHeaders().forEach((h) -> builder.header(h.getName(), h.getValue()));
return builder.build();
}
private class Param {
private final String key;
private final String value;
Param(String key, String value) {
this.key = key;
this.value = value;
}
String getKey() {
return key;
}
String getValue() {
return value;
}
}
}