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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.usability;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.yahoo.component.annotation.Inject;
import com.yahoo.component.ComponentId;
import com.yahoo.container.Container;
import com.yahoo.container.jdisc.JdiscBindingsConfig;
import com.yahoo.jdisc.handler.AbstractRequestHandler;
import com.yahoo.jdisc.handler.CompletionHandler;
import com.yahoo.jdisc.handler.ContentChannel;
import com.yahoo.jdisc.handler.FastContentWriter;
import com.yahoo.jdisc.handler.RequestHandler;
import com.yahoo.jdisc.handler.ResponseDispatch;
import com.yahoo.jdisc.handler.ResponseHandler;
import com.yahoo.jdisc.http.HttpRequest;
import com.yahoo.jdisc.http.HttpRequest.Method;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @author gjoranv
*/
public class BindingsOverviewHandler extends AbstractRequestHandler {
private static final ObjectMapper jsonMapper = new ObjectMapper();
private final JdiscBindingsConfig bindingsConfig;
@Inject
public BindingsOverviewHandler(JdiscBindingsConfig bindingsConfig) {
this.bindingsConfig = bindingsConfig;
}
@Override
public ContentChannel handleRequest(com.yahoo.jdisc.Request request, ResponseHandler handler) {
JsonNode json;
int statusToReturn;
if (request instanceof HttpRequest && ((HttpRequest) request).getMethod() != Method.GET) {
json = errorMessageInJson();
statusToReturn = com.yahoo.jdisc.Response.Status.METHOD_NOT_ALLOWED;
} else {
json = new StatusResponse(bindingsConfig).render();
statusToReturn = com.yahoo.jdisc.Response.Status.OK;
}
FastContentWriter writer = new FastContentWriter(new ResponseDispatch() {
@Override
protected com.yahoo.jdisc.Response newResponse() {
com.yahoo.jdisc.Response response = new com.yahoo.jdisc.Response(statusToReturn);
response.headers().add("Content-Type", List.of("application/json"));
return response;
}
}.connect(handler));
try {
writer.write(jsonMapper.writerWithDefaultPrettyPrinter().writeValueAsBytes(json));
} catch (JsonProcessingException e) {
throw new RuntimeException(e);
} finally {
writer.close();
}
return new IgnoredContent();
}
private static JsonNode errorMessageInJson() {
ObjectNode error = jsonMapper.createObjectNode();
error.put("error", "This API, "
+ BindingsOverviewHandler.class.getSimpleName()
+ ", only supports HTTP GET."
+ " You are probably looking for another API/path.");
return error;
}
static ArrayNode renderRequestHandlers(JdiscBindingsConfig bindingsConfig,
Map<ComponentId, ? extends RequestHandler> handlersById) {
ArrayNode ret = jsonMapper.createArrayNode();
for (Map.Entry<ComponentId, ? extends RequestHandler> handlerEntry : handlersById.entrySet()) {
String id = handlerEntry.getKey().stringValue();
RequestHandler handler = handlerEntry.getValue();
ObjectNode handlerJson = renderComponent(handler, handlerEntry.getKey());
addBindings(bindingsConfig, id, handlerJson);
ret.add(handlerJson);
}
return ret;
}
private static void addBindings(JdiscBindingsConfig bindingsConfig, String id, ObjectNode handlerJson) {
List<String> serverBindings = new ArrayList<>();
JdiscBindingsConfig.Handlers handlerConfig = bindingsConfig.handlers(id);
if (handlerConfig != null) {
serverBindings = handlerConfig.serverBindings();
}
handlerJson.set("serverBindings", renderBindings(serverBindings));
}
private static JsonNode renderBindings(List<String> bindings) {
ArrayNode array = jsonMapper.createArrayNode();
for (String binding : bindings)
array.add(binding);
return array;
}
private static ObjectNode renderComponent(Object component, ComponentId id) {
ObjectNode jc = jsonMapper.createObjectNode();
jc.put("id", id.stringValue());
addBundleInfo(jc, component);
return jc;
}
private static void addBundleInfo(ObjectNode jsonObject, Object component) {
BundleInfo bundleInfo = bundleInfo(component);
jsonObject.put("class", bundleInfo.className);
jsonObject.put("bundle", bundleInfo.bundleName);
}
private static BundleInfo bundleInfo(Object component) {
try {
Bundle bundle = FrameworkUtil.getBundle(component.getClass());
String bundleName = bundle != null
? bundle.getSymbolicName() + ":" + bundle.getVersion()
: "From classpath";
return new BundleInfo(component.getClass().getName(), bundleName);
} catch (Exception | NoClassDefFoundError e) {
return new BundleInfo("Unavailable, reconfiguration in progress.", "");
}
}
static final class BundleInfo {
public final String className;
public final String bundleName;
BundleInfo(String className, String bundleName) {
this.className = className;
this.bundleName = bundleName;
}
}
static final class StatusResponse {
private final JdiscBindingsConfig bindingsConfig;
StatusResponse(JdiscBindingsConfig bindingsConfig) {
this.bindingsConfig = bindingsConfig;
}
public JsonNode render() {
ObjectNode root = jsonMapper.createObjectNode();
root.set("handlers",
renderRequestHandlers(bindingsConfig, Container.get().getRequestHandlerRegistry().allComponentsById()));
return root;
}
}
private static class IgnoredContent implements ContentChannel {
@Override
public void write(ByteBuffer buf, CompletionHandler handler) {
handler.completed();
}
@Override
public void close(CompletionHandler handler) {
handler.completed();
}
}
}
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