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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.handler.admin;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.invoke.MethodHandles;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.lucene.util.BytesRef;
import org.apache.solr.cloud.ZkController;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.solr.common.cloud.ClusterState;
import org.apache.solr.common.cloud.DocCollection;
import org.apache.solr.common.cloud.OnReconnect;
import org.apache.solr.common.cloud.Replica;
import org.apache.solr.common.cloud.SolrZkClient;
import org.apache.solr.common.cloud.ZkStateReader;
import org.apache.solr.common.params.MapSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.common.util.Utils;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.handler.RequestHandlerBase;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.JSONResponseWriter;
import org.apache.solr.response.RawResponseWriter;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.util.SimplePostTool.BAOS;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.data.Stat;
import org.apache.zookeeper.server.ByteBufferInputStream;
import org.noggit.CharArr;
import org.noggit.JSONWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.solr.common.params.CommonParams.OMIT_HEADER;
import static org.apache.solr.common.params.CommonParams.PATH;
import static org.apache.solr.common.params.CommonParams.WT;
/**
* Zookeeper Info
*
* @since solr 4.0
*/
public final class ZookeeperInfoHandler extends RequestHandlerBase {
private final CoreContainer cores;
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
// used for custom sorting collection names looking like prefix##
// only go out to 7 digits (which safely fits in an int)
private static final Pattern endsWithDigits = Pattern.compile("^(\\D*)(\\d{1,7}?)$");
public ZookeeperInfoHandler(CoreContainer cc) {
this.cores = cc;
}
@Override
public String getDescription() {
return "Fetch Zookeeper contents";
}
@Override
public Category getCategory() {
return Category.ADMIN;
}
/**
* Enumeration of ways to filter collections on the graph panel.
*/
static enum FilterType {
none, name, status
}
/**
* Holds state of a single page of collections requested from the cloud panel.
*/
static final class PageOfCollections {
List selected;
int numFound = 0; // total number of matches (across all pages)
int start = 0;
int rows = -1;
FilterType filterType;
String filter;
PageOfCollections(int start, int rows, FilterType filterType, String filter) {
this.start = start;
this.rows = rows;
this.filterType = filterType;
this.filter = filter;
}
void selectPage(List collections) {
numFound = collections.size();
// start with full set and then find the sublist for the desired selected
selected = collections;
if (rows > 0) { // paging desired
if (start > numFound)
start = 0; // this might happen if they applied a new filter
int lastIndex = Math.min(start + rows, numFound);
if (start > 0 || lastIndex < numFound)
selected = collections.subList(start, lastIndex);
}
}
/**
* Filters a list of collections by name if applicable.
*/
List applyNameFilter(List collections) {
if (filterType != FilterType.name || filter == null)
return collections; // name filter doesn't apply
// typically, a user will type a prefix and then *, e.g. tj*
// when they really mean tj.*
String regexFilter = (!filter.endsWith(".*") && filter.endsWith("*"))
? filter.substring(0, filter.length() - 1) + ".*" : filter;
// case-insensitive
if (!regexFilter.startsWith("(?i)"))
regexFilter = "(?i)" + regexFilter;
Pattern filterRegex = Pattern.compile(regexFilter);
List filtered = new ArrayList();
for (String next : collections) {
if (matches(filterRegex, next))
filtered.add(next);
}
return filtered;
}
/**
* Walk the collection state JSON object to see if it has any replicas that match
* the state the user is filtering by.
*/
@SuppressWarnings("unchecked")
final boolean matchesStatusFilter(Map collectionState, Set liveNodes) {
if (filterType != FilterType.status || filter == null || filter.length() == 0)
return true; // no status filter, so all match
boolean isHealthy = true; // means all replicas for all shards active
boolean hasDownedShard = false; // means one or more shards is down
boolean replicaInRecovery = false;
Map shards = (Map) collectionState.get("shards");
for (Object o : shards.values()) {
boolean hasActive = false;
Map shard = (Map) o;
Map replicas = (Map) shard.get("replicas");
for (Object value : replicas.values()) {
Map replicaState = (Map) value;
Replica.State coreState = Replica.State.getState((String) replicaState.get(ZkStateReader.STATE_PROP));
String nodeName = (String) replicaState.get("node_name");
// state can lie to you if the node is offline, so need to reconcile with live_nodes too
if (!liveNodes.contains(nodeName))
coreState = Replica.State.DOWN; // not on a live node, so must be down
if (coreState == Replica.State.ACTIVE) {
hasActive = true; // assumed no replicas active and found one that is for this shard
} else {
if (coreState == Replica.State.RECOVERING) {
replicaInRecovery = true;
}
isHealthy = false; // assumed healthy and found one replica that is not
}
}
if (!hasActive)
hasDownedShard = true; // this is bad
}
if ("healthy".equals(filter)) {
return isHealthy;
} else if ("degraded".equals(filter)) {
return !hasDownedShard && !isHealthy; // means no shards offline but not 100% healthy either
} else if ("downed_shard".equals(filter)) {
return hasDownedShard;
} else if (Replica.State.getState(filter) == Replica.State.RECOVERING) {
return !isHealthy && replicaInRecovery;
}
return true;
}
final boolean matches(final Pattern filter, final String collName) {
return filter.matcher(collName).matches();
}
String getPagingHeader() {
return start + "|" + rows + "|" + numFound + "|" + (filterType != null ? filterType.toString() : "") + "|" + (filter != null ? filter : "");
}
public String toString() {
return getPagingHeader();
}
}
/**
* Supports paged navigation of collections on the cloud panel. To avoid serving
* stale collection data, this object watches the /collections znode, which will
* change if a collection is added or removed.
*/
static final class PagedCollectionSupport implements Watcher, Comparator, OnReconnect {
// this is the full merged list of collections from ZooKeeper
private List cachedCollections;
/**
* If the list of collections changes, mark the cache as stale.
*/
@Override
public void process(WatchedEvent event) {
// session events are not change events, and do not remove the watcher
if (Event.EventType.None.equals(event.getType())) {
return;
}
synchronized (this) {
cachedCollections = null;
}
}
/**
* Create a merged view of all collections (internal from /clusterstate.json and external from /collections/?/state.json
*/
private synchronized List getCollections(SolrZkClient zkClient) throws KeeperException, InterruptedException {
if (cachedCollections == null) {
// cache is stale, rebuild the full list ...
cachedCollections = new ArrayList();
List fromZk = zkClient.getChildren("/collections", this, true);
if (fromZk != null)
cachedCollections.addAll(fromZk);
// sort the final merged set of collections
Collections.sort(cachedCollections, this);
}
return cachedCollections;
}
/**
* Gets the requested page of collections after applying filters and offsets.
*/
public PageOfCollections fetchPage(PageOfCollections page, SolrZkClient zkClient)
throws KeeperException, InterruptedException {
List children = getCollections(zkClient);
page.selected = children; // start with the page being the full list
// activate paging (if disabled) for large collection sets
if (page.start == 0 && page.rows == -1 && page.filter == null && children.size() > 10) {
page.rows = 20;
page.start = 0;
}
// apply the name filter if supplied (we don't need to pull state
// data from ZK to do name filtering
if (page.filterType == FilterType.name && page.filter != null)
children = page.applyNameFilter(children);
// a little hacky ... we can't select the page when filtering by
// status until reading all status objects from ZK
if (page.filterType != FilterType.status)
page.selectPage(children);
return page;
}
@Override
public int compare(String left, String right) {
if (left == null)
return -1;
if (left.equals(right))
return 0;
// sort lexically unless the two collection names start with the same base prefix
// and end in a number (which is a common enough naming scheme to have direct
// support for it)
Matcher leftMatcher = endsWithDigits.matcher(left);
if (leftMatcher.matches()) {
Matcher rightMatcher = endsWithDigits.matcher(right);
if (rightMatcher.matches()) {
String leftGroup1 = leftMatcher.group(1);
String rightGroup1 = rightMatcher.group(1);
if (leftGroup1.equals(rightGroup1)) {
// both start with the same prefix ... compare indexes
// using longs here as we don't know how long the 2nd group is
int leftGroup2 = Integer.parseInt(leftMatcher.group(2));
int rightGroup2 = Integer.parseInt(rightMatcher.group(2));
return (leftGroup2 > rightGroup2) ? 1 : ((leftGroup2 == rightGroup2) ? 0 : -1);
}
}
}
return left.compareTo(right);
}
/**
* Called after a ZooKeeper session expiration occurs
*/
@Override
public void command() {
// we need to re-establish the watcher on the collections list after session expires
synchronized (this) {
cachedCollections = null;
}
}
}
private PagedCollectionSupport pagingSupport;
@Override
@SuppressWarnings({"unchecked"})
public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception {
final SolrParams params = req.getParams();
Map map = new HashMap<>(1);
map.put(WT, "raw");
map.put(OMIT_HEADER, "true");
req.setParams(SolrParams.wrapDefaults(new MapSolrParams(map), params));
synchronized (this) {
if (pagingSupport == null) {
pagingSupport = new PagedCollectionSupport();
ZkController zkController = cores.getZkController();
if (zkController != null) {
// get notified when the ZK session expires (so we can clear the cached collections and rebuild)
zkController.addOnReconnectListener(pagingSupport);
}
}
}
String path = params.get(PATH);
if (params.get("addr") != null) {
throw new SolrException(ErrorCode.BAD_REQUEST, "Illegal parameter \"addr\"");
}
String detailS = params.get("detail");
boolean detail = detailS != null && detailS.equals("true");
String dumpS = params.get("dump");
boolean dump = dumpS != null && dumpS.equals("true");
int start = params.getInt("start", 0);
int rows = params.getInt("rows", -1);
String filterType = params.get("filterType");
if (filterType != null) {
filterType = filterType.trim().toLowerCase(Locale.ROOT);
if (filterType.length() == 0)
filterType = null;
}
FilterType type = (filterType != null) ? FilterType.valueOf(filterType) : FilterType.none;
String filter = (type != FilterType.none) ? params.get("filter") : null;
if (filter != null) {
filter = filter.trim();
if (filter.length() == 0)
filter = null;
}
ZKPrinter printer = new ZKPrinter(cores.getZkController());
printer.detail = detail;
printer.dump = dump;
boolean isGraphView = "graph".equals(params.get("view"));
printer.page = (isGraphView && "/clusterstate.json".equals(path))
? new PageOfCollections(start, rows, type, filter) : null;
printer.pagingSupport = pagingSupport;
try {
printer.print(path);
} finally {
printer.close();
}
rsp.getValues().add(RawResponseWriter.CONTENT,printer);
}
//--------------------------------------------------------------------------------------
//
//--------------------------------------------------------------------------------------
static class ZKPrinter implements ContentStream {
static boolean FULLPATH_DEFAULT = false;
boolean indent = true;
boolean fullpath = FULLPATH_DEFAULT;
boolean detail = false;
boolean dump = false;
String keeperAddr; // the address we're connected to
final BAOS baos = new BAOS();
final Writer out = new OutputStreamWriter(baos, StandardCharsets.UTF_8);
SolrZkClient zkClient;
PageOfCollections page;
PagedCollectionSupport pagingSupport;
ZkController zkController;
public ZKPrinter(ZkController controller) throws IOException {
this.zkController = controller;
keeperAddr = controller.getZkServerAddress();
zkClient = controller.getZkClient();
}
public void close() {
try {
out.flush();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
// main entry point
void print(String path) throws IOException {
if (zkClient == null) {
return;
}
// normalize path
if (path == null) {
path = "/";
} else {
path = path.trim();
if (path.length() == 0) {
path = "/";
}
}
if (path.endsWith("/") && path.length() > 1) {
path = path.substring(0, path.length() - 1);
}
int idx = path.lastIndexOf('/');
String parent = idx >= 0 ? path.substring(0, idx) : path;
if (parent.length() == 0) {
parent = "/";
}
CharArr chars = new CharArr();
JSONWriter json = new JSONWriter(chars, 2);
json.startObject();
if (detail) {
if (!printZnode(json, path)) {
return;
}
json.writeValueSeparator();
}
json.writeString("tree");
json.writeNameSeparator();
json.startArray();
if (!printTree(json, path)) {
return; // there was an error
}
json.endArray();
json.endObject();
out.write(chars.toString());
}
void writeError(int code, String msg) throws IOException {
throw new SolrException(ErrorCode.getErrorCode(code), msg);
/*response.setStatus(code);
CharArr chars = new CharArr();
JSONWriter w = new JSONWriter(chars, 2);
w.startObject();
w.indent();
w.writeString("status");
w.writeNameSeparator();
w.write(code);
w.writeValueSeparator();
w.indent();
w.writeString("error");
w.writeNameSeparator();
w.writeString(msg);
w.endObject();
out.write(chars.toString());*/
}
boolean printTree(JSONWriter json, String path) throws IOException {
String label = path;
if (!fullpath) {
int idx = path.lastIndexOf('/');
label = idx > 0 ? path.substring(idx + 1) : path;
}
json.startObject();
writeKeyValue(json, "text", label, true);
json.writeValueSeparator();
json.writeString("a_attr");
json.writeNameSeparator();
json.startObject();
String href = "admin/zookeeper?detail=true&path=" + URLEncoder.encode(path, "UTF-8");
writeKeyValue(json, "href", href, true);
json.endObject();
Stat stat = new Stat();
try {
// Trickily, the call to zkClient.getData fills in the stat variable
byte[] data = zkClient.getData(path, null, stat, true);
if (stat.getEphemeralOwner() != 0) {
writeKeyValue(json, "ephemeral", true, false);
writeKeyValue(json, "version", stat.getVersion(), false);
}
if (dump) {
json.writeValueSeparator();
printZnode(json, path);
}
} catch (IllegalArgumentException e) {
// path doesn't exist (must have been removed)
writeKeyValue(json, "warning", "(path gone)", false);
} catch (KeeperException e) {
writeKeyValue(json, "warning", e.toString(), false);
log.warn("Keeper Exception", e);
} catch (InterruptedException e) {
writeKeyValue(json, "warning", e.toString(), false);
log.warn("InterruptedException", e);
}
if (stat.getNumChildren() > 0) {
json.writeValueSeparator();
if (indent) {
json.indent();
}
json.writeString("children");
json.writeNameSeparator();
json.startArray();
try {
List children = zkClient.getChildren(path, null, true);
java.util.Collections.sort(children);
boolean first = true;
for (String child : children) {
if (!first) {
json.writeValueSeparator();
}
String childPath = path + (path.endsWith("/") ? "" : "/") + child;
if (!printTree(json, childPath)) {
return false;
}
first = false;
}
} catch (KeeperException e) {
writeError(500, e.toString());
return false;
} catch (InterruptedException e) {
writeError(500, e.toString());
return false;
} catch (IllegalArgumentException e) {
// path doesn't exist (must have been removed)
json.writeString("(children gone)");
}
json.endArray();
}
json.endObject();
return true;
}
String time(long ms) {
return (new Date(ms)).toString() + " (" + ms + ")";
}
public void writeKeyValue(JSONWriter json, String k, Object v, boolean isFirst) {
if (!isFirst) {
json.writeValueSeparator();
}
if (indent) {
json.indent();
}
json.writeString(k);
json.writeNameSeparator();
json.write(v);
}
@SuppressWarnings("unchecked")
boolean printZnode(JSONWriter json, String path) throws IOException {
try {
String dataStr = null;
String dataStrErr = null;
Stat stat = new Stat();
// Trickily, the call to zkClient.getData fills in the stat variable
byte[] data = zkClient.getData(path, null, stat, true);
if (null != data) {
try {
dataStr = (new BytesRef(data)).utf8ToString();
} catch (Exception e) {
dataStrErr = "data is not parsable as a utf8 String: " + e.toString();
}
}
// support paging of the collections graph view (in case there are many collections)
if (page != null) {
// we've already pulled the data for /clusterstate.json from ZooKeeper above,
// but it needs to be parsed into a map so we can lookup collection states before
// trying to find them in the /collections/?/state.json znode
Map clusterstateJsonMap = null;
if (dataStr != null) {
try {
clusterstateJsonMap = (Map) Utils.fromJSONString(dataStr);
} catch (Exception e) {
throw new SolrException(ErrorCode.SERVER_ERROR,
"Failed to parse /clusterstate.json from ZooKeeper due to: " + e, e);
}
} else {
clusterstateJsonMap = Utils.makeMap();
}
// fetch the requested page of collections and then retrieve the state for each
page = pagingSupport.fetchPage(page, zkClient);
// keep track of how many collections match the filter
boolean applyStatusFilter =
(page.filterType == FilterType.status && page.filter != null);
List matchesStatusFilter = applyStatusFilter ? new ArrayList<>() : null;
ClusterState cs = zkController.getZkStateReader().getClusterState();
Set liveNodes = applyStatusFilter ? cs.getLiveNodes() : null;
SortedMap collectionStates = new TreeMap(pagingSupport);
for (String collection : page.selected) {
Object collectionState = clusterstateJsonMap.get(collection);
if (collectionState != null) {
// collection state was in /clusterstate.json
if (applyStatusFilter) {
// verify this collection matches the status filter
if (page.matchesStatusFilter((Map) collectionState, liveNodes)) {
matchesStatusFilter.add(collection);
collectionStates.put(collection, ClusterStatus.postProcessCollectionJSON((Map) collectionState));
}
} else {
collectionStates.put(collection, ClusterStatus.postProcessCollectionJSON((Map) collectionState));
}
} else {
// looks like an external collection ... just use DocCollection instead of reading ZK data directly to work with per replica states
DocCollection dc = cs.getCollectionOrNull(collection);
if (dc != null) {
// TODO: for collections with perReplicaState, a ser/deser to JSON was needed to get the state to render correctly for the UI?
collectionState = dc.isPerReplicaState() ? Utils.fromJSONString(Utils.toJSONString(dc)) : dc.getProperties();
if (applyStatusFilter) {
// verify this collection matches the filtered state
if (page.matchesStatusFilter((Map) collectionState, liveNodes)) {
matchesStatusFilter.add(collection);
collectionStates.put(collection, ClusterStatus.postProcessCollectionJSON((Map) collectionState));
}
} else {
collectionStates.put(collection, ClusterStatus.postProcessCollectionJSON((Map) collectionState));
}
}
}
}
if (applyStatusFilter) {
// update the paged navigation info after applying the status filter
page.selectPage(matchesStatusFilter);
// rebuild the Map of state data
SortedMap map = new TreeMap(pagingSupport);
for (String next : page.selected)
map.put(next, collectionStates.get(next));
collectionStates = map;
}
if (collectionStates != null) {
CharArr out = new CharArr();
new JSONWriter(out, 2).write(collectionStates);
dataStr = out.toString();
}
}
json.writeString("znode");
json.writeNameSeparator();
json.startObject();
writeKeyValue(json, PATH, path, true);
json.writeValueSeparator();
json.writeString("prop");
json.writeNameSeparator();
json.startObject();
writeKeyValue(json, "version", stat.getVersion(), true);
writeKeyValue(json, "aversion", stat.getAversion(), false);
writeKeyValue(json, "children_count", stat.getNumChildren(), false);
writeKeyValue(json, "ctime", time(stat.getCtime()), false);
writeKeyValue(json, "cversion", stat.getCversion(), false);
writeKeyValue(json, "czxid", stat.getCzxid(), false);
writeKeyValue(json, "ephemeralOwner", stat.getEphemeralOwner(), false);
writeKeyValue(json, "mtime", time(stat.getMtime()), false);
writeKeyValue(json, "mzxid", stat.getMzxid(), false);
writeKeyValue(json, "pzxid", stat.getPzxid(), false);
writeKeyValue(json, "dataLength", stat.getDataLength(), false);
if (null != dataStrErr) {
writeKeyValue(json, "dataNote", dataStrErr, false);
}
json.endObject();
if (null != dataStr) {
writeKeyValue(json, "data", dataStr, false);
}
if (page != null) {
writeKeyValue(json, "paging", page.getPagingHeader(), false);
}
json.endObject();
} catch (KeeperException e) {
writeError(500, e.toString());
return false;
} catch (InterruptedException e) {
writeError(500, e.toString());
return false;
}
return true;
}
/* @Override
public void write(OutputStream os) throws IOException {
ByteBuffer bytes = baos.getByteBuffer();
os.write(bytes.array(),0,bytes.limit());
}
*/
@Override
public String getName() {
return null;
}
@Override
public String getSourceInfo() {
return null;
}
@Override
public String getContentType() {
return JSONResponseWriter.CONTENT_TYPE_JSON_UTF8;
}
@Override
public Long getSize() {
return null;
}
@Override
public InputStream getStream() throws IOException {
return new ByteBufferInputStream(baos.getByteBuffer());
}
@Override
public Reader getReader() throws IOException {
return null;
}
}
}
