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Building blocks for ClusterMate-based services and servers.
package com.fasterxml.clustermate.service.store;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.skife.config.TimeSpan;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.storemate.shared.ByteContainer;
import com.fasterxml.storemate.shared.ByteRange;
import com.fasterxml.storemate.shared.StartAndStoppable;
import com.fasterxml.storemate.shared.StorableKey;
import com.fasterxml.storemate.shared.TimeMaster;
import com.fasterxml.storemate.shared.compress.Compression;
import com.fasterxml.storemate.shared.compress.Compressors;
import com.fasterxml.storemate.shared.hash.HashConstants;
import com.fasterxml.storemate.store.*;
import com.fasterxml.storemate.store.backend.IterationAction;
import com.fasterxml.storemate.store.backend.StorableIterationCallback;
import com.fasterxml.storemate.store.file.FileManager;
import com.fasterxml.storemate.store.lastaccess.LastAccessUpdateMethod;
import com.fasterxml.storemate.store.util.OperationDiagnostics;
import com.fasterxml.clustermate.api.*;
import com.fasterxml.clustermate.api.msg.ListItem;
import com.fasterxml.clustermate.api.msg.ListResponse;
import com.fasterxml.clustermate.service.*;
import com.fasterxml.clustermate.service.cfg.ServiceConfig;
import com.fasterxml.clustermate.service.cluster.ClusterViewByServer;
import com.fasterxml.clustermate.service.metrics.AllOperationMetrics;
import com.fasterxml.clustermate.service.metrics.ExternalOperationMetrics;
import com.fasterxml.clustermate.service.msg.*;
import com.fasterxml.storemate.store.util.SimpleLogThrottler;
/**
* Class that handles coordination between front-end service layer (Servlet,
* JAX-RS) and back-end storage layer.
*/
public abstract class StoreHandler<
K extends EntryKey,
E extends StoredEntry,
L extends ListItem
>
extends HandlerBase
implements StartAndStoppable
{
/**
* Let's not allow unlimited number of entries to traverse, no matter what.
*/
private final static int MAX_MAX_ENTRIES = 500;
/**
* And for now strict time limit of 5 seconds
*/
private final static long MAX_LIST_TIME_MSECS = 5000L;
private final static ListLimits DEFAULT_LIST_LIMITS =
ListLimits.defaultLimits()
.withMaxEntries(MAX_MAX_ENTRIES)
.withMaxMsecs(MAX_LIST_TIME_MSECS);
/*
/**********************************************************************
/* Configuration
/**********************************************************************
*/
protected final ServiceConfig _serviceConfig;
/**
* Whether server-side (auto-)compression is enabled or not.
*/
protected final boolean _cfgCompressionEnabled;
protected final int _cfgDefaultMinTTLSecs;
protected final int _cfgDefaultMaxTTLSecs;
/*
/**********************************************************************
/* Helper objects, general
/**********************************************************************
*/
protected final ClusterViewByServer _cluster;
protected final Stores _stores;
protected final FileManager _fileManager;
protected final TimeMaster _timeMaster;
protected final EntryKeyConverter _keyConverter;
protected final StoredEntryConverter _entryConverter;
protected final ObjectMapper _objectMapper;
protected final ObjectWriter _listJsonWriter;
protected final ObjectWriter _listSmileWriter;
// Do we want these output? Not for production, at least...
// TODO: Externalize
private final static boolean LOG_DUP_PUTS = false;
// log dup puts at max rate of 1 per second
protected final SimpleLogThrottler _dupPutsLogger = LOG_DUP_PUTS ?
new SimpleLogThrottler(LOG, 1000) : null;
/*
/**********************************************************************
/* Helper objects, deferred delete support
/**********************************************************************
*/
/**
* Does store use deferred (queued) deletions?
*/
protected final DeferredDeleter _deferredDeleter;
/*
/**********************************************************************
/* Construction
/**********************************************************************
*/
public StoreHandler(SharedServiceStuff stuff, Stores stores,
ClusterViewByServer cluster)
{
_cluster = cluster;
_stores = stores;
_fileManager = stuff.getFileManager();
_timeMaster = stuff.getTimeMaster();
_keyConverter = stuff.getKeyConverter();
_cfgCompressionEnabled = stuff.getStoreConfig().compressionEnabled;
_objectMapper = stuff.jsonMapper();
_listJsonWriter = stuff.jsonWriter();
_listSmileWriter = stuff.smileWriter();
_serviceConfig = stuff.getServiceConfig();
_entryConverter = stuff.getEntryConverter();
// seconds used (over millis) to fit in 32-bit int when stored
_cfgDefaultMinTTLSecs = (int) (_serviceConfig.cfgDefaultSinceAccessTTL.getMillis() / 1000L);
_cfgDefaultMaxTTLSecs = (int) (_serviceConfig.cfgDefaultMaxTTL.getMillis() / 1000L);
// Are we to do deferred deletions?
_deferredDeleter = constructDeleter(stuff, stores);
}
/*
/**********************************************************************
/* Minimal service life-cycle to inform deferred deleter if necessary
/**********************************************************************
*/
@Override
public void start() throws Exception
{
if (_deferredDeleter != null) {
_deferredDeleter.start();
}
}
@Override
public void prepareForStop() throws Exception
{
if (_deferredDeleter != null) {
_deferredDeleter.prepareForStop();
}
}
@Override
public void stop() throws Exception
{
if (_deferredDeleter != null) {
_deferredDeleter.stop();
}
}
/*
/**********************************************************************
/* Support for unit tests
/**********************************************************************
*/
public Stores getStores() { return _stores; }
/*
/**********************************************************************
/* Abstract and overridable methods for sub-classes
/**********************************************************************
*/
/**
* Method called for PUT operations, to figure out which method of updating
* "last-access" information should be used, if any. When entries are successfully
* PUT, information will be stored as part of entry metadata and does NOT
* come from request.
*/
protected abstract LastAccessUpdateMethod _findLastAccessUpdateMethod(ServiceRequest request, K key);
/**
* Method called to let implementation update last-accessed timestamp if necessary
* when a piece of content is succesfully fetched with GET (exists and either is
* not soft-deleted, or passes check for deletion)
*/
protected void updateLastAccessedForGet(ServiceRequest request, ServiceResponse response,
E entry, long accessTime) { }
protected void updateLastAccessedForHead(ServiceRequest request, ServiceResponse response,
E entry, long accessTime) { }
/**
* Method called to let implementation do whatever updates are needed when
* specified entry has been (soft-)deleted. This may mean deletion of
* the last-accessed entry.
*/
protected void updateLastAccessedForDelete(ServiceRequest request, ServiceResponse response,
K key, long accessTime) { }
protected abstract DeferredDeleter constructDeleter(SharedServiceStuff stuff,
Stores stores);
/*
/**********************************************************************
/* Additional metrics access
/**********************************************************************
*/
public void augmentOperationMetrics(AllOperationMetrics metrics)
{
ExternalOperationMetrics deleteMetrics = metrics.DELETE;
if (deleteMetrics != null) { // just for sanity...
_deferredDeleter.augmentMetrics(deleteMetrics);
}
}
/*
/**********************************************************************
/* Content access (GET)
/**********************************************************************
*/
public ServiceResponse getEntry(ServiceRequest request, ServiceResponse response, K key)
throws StoreException
{
return getEntry(request, response, key, null);
}
public ServiceResponse getEntry(ServiceRequest request, ServiceResponse response, K key,
OperationDiagnostics diag)
throws StoreException
{
String rangeStr = request.getHeader(ClusterMateConstants.HTTP_HEADER_RANGE_FOR_REQUEST);
ByteRange range;
try {
range = request.findByteRange();
} catch (IllegalArgumentException e) {
return invalidRange(response, key, rangeStr, e.getMessage());
}
final StorableStore entryStore = _stores.getEntryStore();
String acceptableEnc = request.getHeader(ClusterMateConstants.HTTP_HEADER_ACCEPT_COMPRESSION);
Storable rawEntry;
try {
rawEntry = findRawEntryForReads(entryStore, key, diag);
} catch (IOException e) {
return _storeError(response, key, e);
}
if (rawEntry == null) {
return handleGetForMissing(request, response, key);
}
// second: did we get a tombstone?
if (rawEntry.isDeleted()) {
ServiceResponse resp = handleGetForDeleted(request, response, key, rawEntry);
if (resp != null) {
return resp;
}
}
// [issue #7]: Conditional GET with Etag
if (_notChanged(request, rawEntry)) {
return response.notChanged();
}
final long accessTime = _timeMaster.currentTimeMillis();
final E entry = _entryConverter.entryFromStorable(rawEntry);
updateLastAccessedForGet(request, response, entry, accessTime);
Compression comp = entry.getCompression();
boolean skipCompression;
// Range to resolve, now that we know full length?
if (range != null) {
range = range.resolveWithTotalLength(entry.getActualUncompressedLength());
final long length = range.calculateLength();
// any bytes matching? If not, it's a failure
if (length <= 0L) {
return response.badRange(new GetErrorResponse(key, "Invalid 'Range' HTTP Header (\""+range+"\")"));
}
// note: can not skip decompress if we have to give range...
skipCompression = false;
} else {
skipCompression = (comp != Compression.NONE) && comp.isAcceptable(acceptableEnc);
}
StreamingResponseContent output;
if (entry.hasExternalData()) { // need to stream from File
File f = entry.getRaw().getExternalFile(_fileManager);
// this is where we can expect to get "file not found exception".
// NOTE: not optimal, since this is one I/O operation that is outside throttling;
// but that can't be helped for now -- we MUST catch the problem here, before
// adding other response information
try {
output = new FileBackedResponseContentImpl(diag, _timeMaster, entryStore,
accessTime, f, skipCompression ? null : comp, range, entry);
} catch (StoreException e) {
LOG.error("Problem trying to GET entry '"+key+"': "+e.getMessage());
return response.internalFileNotFound(new GetErrorResponse(key, e.getMessage()));
}
} else { // inline
ByteContainer inlined = entry.getRaw().getInlinedData();
if (!skipCompression) {
try {
inlined = Compressors.uncompress(inlined, comp, (int) entry.getRaw().getOriginalLength());
} catch (IOException e) {
return internalGetError(response, e, key, "Failed to decompress inline data");
}
}
output = new SimpleStreamingResponseContent(diag, _timeMaster, inlined, range, inlined.byteLength());
}
// #21: provide content length header
long cl = output.getLength();
if (cl >= 0L) {
response = response.setContentLength(cl);
}
// one more thing; add header for range if necessary; also, response code differs
if (range == null) {
response = response.ok(output);
} else {
response = response.partialContent(output, range.asResponseHeader());
}
// Issue #6: Need to provide Etag, if content hash available
int contentHash = rawEntry.getContentHash();
if (contentHash != HashConstants.NO_CHECKSUM) {
StringBuilder sb = new StringBuilder();
sb.append('"');
sb.append(contentHash);
sb.append('"');
response = response.addHeader(ClusterMateConstants.HTTP_HEADER_ETAG, sb.toString());
}
// also need to let client know we left compression in there:
if (skipCompression) {
response = response.setBodyCompression(comp.asContentEncoding());
}
return response;
}
protected boolean _notChanged(ServiceRequest request, Storable rawEntry)
{
// First: entry must have hash value to compare against
int contentHash = rawEntry.getContentHash();
if (contentHash != HashConstants.NO_CHECKSUM) {
String rangeStr = request.getHeader(ClusterMateConstants.HTTP_HEADER_ETAG_NO_MATCH);
if (rangeStr != null) {
rangeStr = rangeStr.trim();
if (rangeStr.length() > 2 && rangeStr.charAt(0) == '"') {
int ix = rangeStr.lastIndexOf('"');
if (ix > 0) {
rangeStr = rangeStr.substring(1, ix);
try {
// Parse as Long to allow for both signed and unsigned representations
// of 32-bit hash value
long l = Long.parseLong(rangeStr);
int i = (int) l;
return (i == contentHash);
} catch (IllegalArgumentException e) { }
}
}
}
}
return false;
}
/*
/**********************************************************************
/* Content access, metadata
/**********************************************************************
*/
public ServiceResponse getEntryStats(ServiceRequest request, ServiceResponse response, K key)
throws StoreException
{
return getEntryStats(request, response, key, null);
}
// public for calling from unit tests
public ServiceResponse getEntryStats(ServiceRequest request, ServiceResponse response, K key,
OperationDiagnostics diag)
throws StoreException
{
// Do we need special handling for Range requests? (GET only?)
// Should this update last-accessed as well? (for now, won't)
Storable rawEntry;
try {
rawEntry = findRawEntryForReads(_stores.getEntryStore(), key, diag);
} catch (IOException e) {
return _storeError(response, key, e);
}
if (diag != null) {
diag.setEntry(rawEntry);
}
if (rawEntry == null) {
return response.notFound(new GetErrorResponse(key, "No entry found for key '"+key+"'"));
}
// second: did we get a tombstone?
if (rawEntry.isDeleted()) {
return response.noContent();
}
final long accessTime = _timeMaster.currentTimeMillis();
final E entry = _entryConverter.entryFromStorable(rawEntry);
// should this be recorded in OpStats?
updateLastAccessedForHead(request, response, entry, accessTime);
// Other than this: let's only check out length of data there would be...
final Compression comp = entry.getCompression();
long size;
// Would we return content as-is? (not compressed, or compressed using something
// client accepts)
String acceptableComp = request.getHeader(ClusterMateConstants.HTTP_HEADER_ACCEPT_COMPRESSION);
if ((comp == Compression.NONE) ||
(acceptableComp != null && !acceptableComp.isEmpty() && comp.isAcceptable(acceptableComp))) {
size = entry.getStorageLength();
} else {
size = entry.getActualUncompressedLength();
}
return response.ok().setContentLength(size);
}
/*
/**********************************************************************
/* Content insertion (PUT)
/**********************************************************************
*/
public ServiceResponse putEntry(ServiceRequest request, ServiceResponse response,
K key, InputStream dataIn)
{
return putEntry(request, response, key, dataIn, null);
}
public ServiceResponse putEntry(ServiceRequest request, ServiceResponse response,
K key, InputStream dataIn, OperationDiagnostics metadata)
{
final int checksum = _decodeInt(request.getQueryParameter(ClusterMateConstants.QUERY_PARAM_CHECKSUM), 0);
return putEntry(request, response, key, checksum, dataIn, null, null, metadata);
}
// Public due to unit tests
public ServiceResponse putEntry(ServiceRequest request, ServiceResponse response,
K key, int checksum,// 32-bit hash by client
InputStream dataIn,
TimeSpan minTTLSinceAccess, TimeSpan maxTTL,
OperationDiagnostics stats)
{
final long creationTime = _timeMaster.currentTimeMillis();
// What compression, if any, is payload using?
Compression inputCompression = Compression.forContentEncoding(request.getHeader(
ClusterMateConstants.HTTP_HEADER_COMPRESSION));
final StorableCreationMetadata stdMetadata = new StorableCreationMetadata(inputCompression,
checksum, 0);
if (inputCompression != null && inputCompression != Compression.NONE) {
String valueStr = request.getHeader(ClusterMateConstants.CUSTOM_HTTP_HEADER_UNCOMPRESSED_LENGTH);
long uncompLen = -1L;
if (valueStr != null) {
uncompLen = _decodeLong(valueStr, uncompLen);
}
if (uncompLen <= 0L) {
final String prefix = (valueStr == null)? "Missing" : "Invalid";
return response.badRequest
(PutResponse.badCompression(key, prefix+" value for header "
+ClusterMateConstants.CUSTOM_HTTP_HEADER_UNCOMPRESSED_LENGTH
+"; required for compression type of "+inputCompression));
}
stdMetadata.uncompressedSize = uncompLen;
}
// assumption here is that we may be passed hash code of orig content, but
// not that of compressed (latter is easy to calculate on server anyway)
ByteContainer customMetadata = constructPutMetadata(request, key, creationTime,
minTTLSinceAccess, maxTTL);
StorableCreationResult result;
try {
/* This gets quite convoluted but that's how it goes: if undelete (put with
* exact same content) is allowed, we must use different method:
*/
if (_serviceConfig.cfgAllowUndelete) {
result = _stores.getEntryStore().upsertConditionally(StoreOperationSource.REQUEST, stats,
key.asStorableKey(),
dataIn, stdMetadata, customMetadata, true,
AllowUndeletingUpdates.instance);
} else {
result = _stores.getEntryStore().insert(StoreOperationSource.REQUEST, stats,
key.asStorableKey(), dataIn, stdMetadata, customMetadata);
}
} catch (StoreException.Input e) { // something client did wrong
switch (e.getProblem()) {
case BAD_COMPRESSION:
return response.badRequest
(PutResponse.badCompression(key, "Bad Compression information passed: "+e.getMessage()));
case BAD_CHECKSUM:
return response.badRequest
(PutResponse.badArg(key, "Bad Checksum information passed: "+e.getMessage()));
case BAD_LENGTH:
return response.badRequest
(PutResponse.badArg(key, "Bad Length information passed: "+e.getMessage()));
}
return internalPutError(response, key,
e, "Failed to PUT an entry: "+e.getMessage());
} catch (IOException e) {
return internalPutError(response, key,
e, "Failed to PUT an entry: "+e.getMessage());
}
// And then check whether it was a dup put; and if so, that checksums match
Storable prev = result.getPreviousEntry();
if (prev != null) {
if (stats != null) {
stats.setEntry(result.getNewEntry());
}
_logDuplicatePut(key);
// first: will not allow "recreating" a soft-deleted entry
if (prev.isDeleted()) {
if (!_serviceConfig.cfgAllowUndelete) {
String prob = "Failed PUT: trying to recreate deleted entry '"+key+"'";
return response.gone(PutResponse.error(key, prev, prob));
}
// otherwise... we are ok, iff checksums match
}
// second: verify that checksums match:
String prob = _verifyChecksums(prev, stdMetadata);
if (prob != null) {
return response.conflict(PutResponse.error(key, prev, "Failed PUT: trying to "
+(prev.isDeleted() ? "undelete" : "overwrite")
+" entry '"+key+"' but "+prob));
}
} else if (stats != null) {
stats.setEntry(result.getNewEntry());
}
return response.ok(PutResponse.ok(key, result.getNewEntry()));
}
private String _verifyChecksums(Storable oldEntry, StorableCreationMetadata newEntry)
{
if (oldEntry.getContentHash() != newEntry.contentHash) {
return "checksums differ; old had 0x"+Integer.toHexString(oldEntry.getContentHash())+", new 0x"+Integer.toHexString(newEntry.contentHash);
}
if (oldEntry.getCompressedHash() != newEntry.compressedContentHash) {
return "checksumForCompressed differ; old had 0x"+Integer.toHexString(oldEntry.getCompressedHash())
+", new 0x"+Integer.toHexString(newEntry.compressedContentHash);
}
Compression oldC = oldEntry.getCompression();
Compression newC = newEntry.compression;
if (newC == null) {
newC = Compression.NONE;
}
if (oldC != newC) {
return "entity compression differs; old had "+oldC+" new "+newC;
}
return null;
}
/*
/**********************************************************************
/* Content deletion
/**********************************************************************
*/
public ServiceResponse removeEntry(ServiceRequest request, ServiceResponse response, K key)
throws IOException, StoreException
{
return removeEntry(request, response, key, null);
}
public ServiceResponse removeEntry(ServiceRequest request, ServiceResponse response, K key,
OperationDiagnostics metadata)
throws IOException, StoreException
{
// this may or may not result in deferred:
long startTime = _timeMaster.currentTimeMillis();
DeletionResult result;
try {
result = _deferredDeleter.addDeferredDeletion(key.asStorableKey(), startTime);
} catch (Exception e) {
LOG.error("Problem during DELETE scheduling: {}", e);
return response.internalError("Failure due to: "+e);
}
switch (result.getStatus()) {
case COMPLETED:
response = response.ok(new DeleteResponse(key, 1));
break;
case DEFERRED:
response = response.accepted(new DeleteResponse(key, -1));
break;
case QUEUE_FULL:
return response.internalServerError();
case TIMED_OUT:
return response.serverOverload();
case FAILED:
{
Throwable t = result.getRootCause();
if (t instanceof StoreException) {
return _storeError(response, key, (StoreException) t);
}
return response.internalError("Failure due to: "+t);
}
default:
{
String msg = "Unrecognized status: "+result.getStatus();
LOG.error(msg);
return response.internalServerError(msg);
}
}
// If we got this far, can queue last-access deletion as well
/* Even without match, we can claim it is ok... should we?
* From idempotency perspective, result is that there is no such
* entry; so let's allow that and just report ok.
*/
// and finally, possibly remove matching last-accessed entry
final long deleteTime = _timeMaster.currentTimeMillis();
updateLastAccessedForDelete(request, response, key, deleteTime);
return response;
}
/*
/**********************************************************************
/* Listing entries
/**********************************************************************
*/
/**
* End point clients use to list entries with given name prefix,
*
* @param prefix Path prefix to use for filtering out entries not to list
* @param stats Diagnostic information to update, if any
*
* @return Modified response object
*/
@SuppressWarnings("unchecked")
public OUT listEntries(ServiceRequest request, OUT response,
final K prefix, OperationDiagnostics stats)
throws StoreException
{
// simple validation first
if (prefix == null) {
return (OUT) badRequest(response, "Missing path parameter for 'listEntries'");
}
String typeStr = request.getQueryParameter(ClusterMateConstants.QUERY_PARAM_TYPE);
ListItemType listType = ListItemType.find(typeStr);
if (listType == null) {
if (typeStr == null || typeStr.isEmpty()) {
return (OUT) badRequest(response, "Missing query parameter '"
+ClusterMateConstants.QUERY_PARAM_TYPE+"'");
}
return (OUT) badRequest(response, "Invalid query parameter '"
+ClusterMateConstants.QUERY_PARAM_TYPE+"', value '"+typeStr+"'");
}
/* First a sanity check: prefix should map to our active or passive range.
* If not, we should not have any data to list; so let's (for now?) fail request:
*/
int rawHash = _keyConverter.routingHashFor(prefix);
// note: _cluster is null for testing, not for regular operation
if ((_cluster != null) && !_cluster.getLocalState().inAnyRange(rawHash)) {
return (OUT) badRequest(response, "Invalid prefix: not in key range (%s) of node",
_cluster.getLocalState().totalRange());
}
// Then extract 'lastSeen', if it's passed:
StorableKey lastSeen = null;
String b64str = request.getQueryParameter(ClusterMateConstants.QUERY_PARAM_LAST_SEEN);
if (b64str != null && b64str.length() > 0) {
try {
// Jackson can do base64 decoding, and this is the easiest way
byte[] lastSeenRaw = _objectMapper.convertValue(b64str, byte[].class);
lastSeen = new StorableKey(lastSeenRaw);
} catch (Exception e) {
return (OUT) badRequest(response, "Invalid '"+ClusterMateConstants.QUERY_PARAM_LAST_SEEN
+"' value; not valid base64 encoded byte sequence");
}
}
// Otherwise can start listing
boolean useSmile = _acceptSmileContentType(request);
final StorableKey rawPrefix = prefix.asStorableKey();
ListLimits limits = DEFAULT_LIST_LIMITS;
String maxStr = request.getQueryParameter(ClusterMateConstants.QUERY_PARAM_MAX_ENTRIES);
if (maxStr != null) {
limits = limits.withMaxEntries(_decodeInt(maxStr, limits.getMaxEntries()));
}
// !!! TODO: allow listing of tombstones?
ListResponse listResponse = null;
switch (listType) {
case ids:
{
List ids = _listIds(stats, rawPrefix, lastSeen, limits);
listResponse = new ListResponse.IdListResponse(ids, _last(ids));
}
break;
case names:
{
List ids = _listIds(stats, rawPrefix, lastSeen, limits);
ArrayList names = new ArrayList(ids.size());
for (StorableKey id : ids) {
names.add(_keyConverter.rawToString(id));
}
listResponse = new ListResponse.NameListResponse(names, _last(ids));
}
break;
case minimalEntries:
case fullEntries:
{
List items = _listItems(stats, listType, rawPrefix, lastSeen, limits);
ListItem lastItem = _last(items);
if (listType == ListItemType.minimalEntries) {
listResponse = new ListResponse.MinimalItemListResponse(items,
(lastItem == null) ? null : lastItem.getKey());
} else {
listResponse = new ListResponse(items,
(lastItem == null) ? null : lastItem.getKey());
}
}
break;
default:
throw new IllegalStateException();
}
if (stats != null) {
stats.setItemCount(listResponse.size());
}
final ObjectWriter w = useSmile ? _listSmileWriter : _listJsonWriter;
final String contentType = useSmile ? ContentType.SMILE.toString()
: ContentType.JSON.toString();
return (OUT) response.ok(contentType, new StreamingEntityImpl(w, listResponse));
}
protected final static T _last(List list) {
if (list == null || list.isEmpty()) {
return null;
}
return list.get(list.size() - 1);
}
protected List _listItems(OperationDiagnostics diag,
ListItemType itemType, StorableKey prefix,
StorableKey lastSeen, ListLimits limits)
throws StoreException
{
// we could check if all entries were iterated (with result code); for now we won't
ListItemsCallback cb = (itemType == ListItemType.fullEntries)
? new FullListItemsCallback(_timeMaster, _entryConverter, prefix, limits)
: new ListItemsCallback(_timeMaster, _entryConverter, prefix, limits)
;
/* Two cases; either starting without last seen -- in which case we should include
* the first entry -- or with last-seen, in which case it is to be skipped.
*/
if (lastSeen == null) {
// we could check if all entries were iterated (with result code); for now we won't
/*IterationResult r =*/ _stores.getEntryStore().iterateEntriesByKey(StoreOperationSource.REQUEST, diag,
prefix, cb);
} else {
// we could check if all entries were iterated (with result code); for now we won't
/*IterationResult r =*/ _stores.getEntryStore().iterateEntriesAfterKey(StoreOperationSource.REQUEST, diag,
lastSeen, cb);
}
return cb.getResult();
}
protected List _listIds(final OperationDiagnostics diag,
final StorableKey prefix, StorableKey lastSeen,
final ListLimits limits)
throws StoreException
{
final long maxTime = _timeMaster.currentTimeMillis() + limits.getMaxMsecs();
final int maxEntries = limits.getMaxEntries();
final ArrayList result = new ArrayList(100);
final boolean includeTombstones = limits.getIncludeTombstones();
StorableIterationCallback cb = new StorableIterationCallback() {
public int counter; // to avoid checking systime too often
@Override
public IterationAction verifyKey(StorableKey key) {
if (!key.hasPrefix(prefix)) {
return IterationAction.TERMINATE_ITERATION;
}
// Can add right away, if it's ok to include tombstones
if (includeTombstones) {
return _addEntry(key);
}
// otherwise need to peek in entry itself
return IterationAction.PROCESS_ENTRY;
}
private final IterationAction _addEntry(StorableKey key)
{
result.add(key);
if (result.size() >= maxEntries) {
return IterationAction.TERMINATE_ITERATION;
}
if (((++counter & 15) == 0) // check for every 16 items
&& _timeMaster.currentTimeMillis() >= maxTime) {
return IterationAction.TERMINATE_ITERATION;
}
// no need for entry; key has all the data
return IterationAction.SKIP_ENTRY;
}
@Override
public IterationAction processEntry(Storable entry) throws StoreException {
if (includeTombstones || entry.isDeleted()) {
return IterationAction.SKIP_ENTRY;
}
return _addEntry(entry.getKey());
}
};
/* Two cases; either starting without last seen -- in which case we should include
* the first entry -- or with last-seen, in which case it is to be skipped.
*/
if (lastSeen == null) {
// we could check if all entries were iterated (with result code); for now we won't
/*IterationResult r =*/ _stores.getEntryStore().iterateEntriesByKey(StoreOperationSource.REQUEST, diag,
prefix, cb);
} else {
// we could check if all entries were iterated (with result code); for now we won't
/*IterationResult r =*/ _stores.getEntryStore().iterateEntriesAfterKey(StoreOperationSource.REQUEST, diag,
lastSeen, cb);
}
return result;
}
/*
/**********************************************************************
/* Customizable handling for query parameter access, defaulting
/**********************************************************************
*/
protected ByteContainer constructPutMetadata(ServiceRequest request, K key, long creationTime,
TimeSpan minTTLSinceAccess, TimeSpan maxTTL)
{
if (minTTLSinceAccess == null) {
minTTLSinceAccess = findMinTTLParameter(request, key);
}
if (maxTTL == null) {
maxTTL = findMaxTTLParameter(request, key);
}
LastAccessUpdateMethod lastAcc = _findLastAccessUpdateMethod(request, key);
int minTTLSecs = (minTTLSinceAccess == null) ? findMinTTLDefaultSecs(request, key)
: (int) (minTTLSinceAccess.getMillis() / 1000);
int maxTTLSecs = (maxTTL == null) ? findMaxTTLDefaultSecs(request, key)
: (int) (maxTTL.getMillis() / 1000);
return _entryConverter.createMetadata(creationTime,
((lastAcc == null) ? 0 : lastAcc.asByte()),
minTTLSecs, maxTTLSecs);
}
/**
* Overridable helper method used for figuring out request parameter used to
* pass "minimum time-to-live since last access" (or, if no access tracked,
* since creation).
*/
protected TimeSpan findMinTTLParameter(ServiceRequest request, K key)
{
String paramKey = ClusterMateConstants.QUERY_PARAM_MIN_SINCE_ACCESS_TTL;
return _timeSpanFrom(paramKey, request.getQueryParameter(paramKey));
}
/**
* Overridable helper method used for figuring out request parameter used to
* pass "maximum time-to-live since creation".
*/
protected TimeSpan findMaxTTLParameter(ServiceRequest request, K key)
{
String paramKey = ClusterMateConstants.QUERY_PARAM_MAX_TTL;
final String paramValue = request.getQueryParameter(paramKey);
return _timeSpanFrom(paramKey, paramValue);
}
protected TimeSpan _timeSpanFrom(String key, String value)
{
if (_isEmpty(value)) {
return null;
}
// Let's use bit of heuristics; pure number == seconds; otherwise, TimeSpan
char c = value.charAt(value.length() - 1);
try {
if (c <= '9' && c >= '0') {
return new TimeSpan(Integer.parseInt(value), TimeUnit.SECONDS);
}
return new TimeSpan(value);
} catch (Exception e) {
throw new IllegalArgumentException("Invalid value for '"+key+"': \""+value
+"\": needs to be either number (seconds), or valid TimeSpan expression (like \"7d\")");
}
}
protected int findMinTTLDefaultSecs(ServiceRequest request, K key) {
return _cfgDefaultMinTTLSecs;
}
protected int findMaxTTLDefaultSecs(ServiceRequest request, K key) {
return _cfgDefaultMaxTTLSecs;
}
/*
/**********************************************************************
/* Customizable handling for locating raw entries for reads (GET, HEAD)
/**********************************************************************
*/
/**
* Overridable accessor methods used for GET and HEAD requests.
*/
protected Storable findRawEntryForReads(StorableStore entryStore, K key,
OperationDiagnostics diag)
throws IOException, StoreException
{
return entryStore.findEntry(StoreOperationSource.REQUEST,
diag, key.asStorableKey());
}
/*
/**********************************************************************
/* Customizable handling for deleted and missing entries
/**********************************************************************
*/
/**
* Method called to determine what to do when no entry was found for GET
* with specified key.
* Method must return a non-null response to return to sender.
*/
protected ServiceResponse handleGetForDeleted(ServiceRequest request, ServiceResponse response,
K key, Storable contents)
{
if (_serviceConfig.cfgReportDeletedAsEmpty) {
return response.noContent();
}
return response.notFound(new GetErrorResponse(key, "No entry found for key '"+key+"'"));
}
/**
* Method called to determine what to do when a (soft-)deleted entry is found with GET.
* Choices include sending a specific response (404 or 204, for example; or returning
* null to indicate "handle normally".
*/
protected ServiceResponse handleGetForMissing(ServiceRequest request, ServiceResponse response,
K key)
{
return response.notFound(new GetErrorResponse(key, "No entry found for key '"+key+"'"));
}
/*
/**********************************************************************
/* Error reporting
/**********************************************************************
*/
@SuppressWarnings("unchecked")
@Override
protected OUT _badRequest(ServiceResponse response, String msg) {
return (OUT) response.badRequest(msg).setContentTypeText();
}
@SuppressWarnings("unchecked")
protected OUT _storeError(ServiceResponse response, K key,
IOException e) {
String msg;
if (key == null) {
msg = "StoreException (key "+key+"): "+e.getMessage();
} else {
msg = "StoreException: "+e.getMessage();
}
// 18-Mar-2013, tatu: StoreExceptions are special enough (unless proven otherwise)
// such that we do want to log details -- to be tuned as necessary
LOG.error(msg, e);
return (OUT) response.serviceTimeout(msg).setContentTypeText();
}
private ServiceResponse invalidRange(ServiceResponse response,
K key, String value, String errorMsg)
{
return response.badRequest
(PutResponse.badArg(key, "Invalid 'Range' HTTP Header (\""+value+"\"), problem: "+errorMsg));
}
private ServiceResponse internalGetError(ServiceResponse response,
Exception e, K key, String msg)
{
msg = "Failed GET, key '"+key+"': "+msg;
if (e != null) {
msg += " (error message: "+e.getMessage()+")";
LOG.error("Internal error for GET request: "+msg, e);
}
return response.internalError(new GetErrorResponse(key, msg));
}
private ServiceResponse internalPutError(ServiceResponse response,
K key, Throwable e, String msg)
{
if (e != null) {
e = _peel(e);
msg = msg + ": "+e.getMessage();
LOG.error("Internal error for PUT request: "+msg, e);
}
return response.internalError(PutResponse.error(key, msg));
}
/*
/**********************************************************************
/* Internal methods, diagnostics
/**********************************************************************
*/
protected void _logDuplicatePut(K key)
{
if (_dupPutsLogger != null) {
_dupPutsLogger.logWarn("Duplicate PUT for key '{}'; success, same checksum", key);
}
}
/*
/**********************************************************************
/* Other helper methods
/**********************************************************************
*/
private boolean _isEmpty(String value)
{
return (value == null || value.length() == 0);
}
/**
* Crappy little parse function that will try to avoid exception if
* possible (exceptions are exceptionally costly to construct),
* defer to JDK standard parsing if thing looks ok
*/
private final int _decodeInt(String input, int defaultValue)
{
if (input == null || input.length() == 0) {
return defaultValue;
}
if ("0".equals(input)) {
return 0;
}
final int len = input.length();
int i = 0;
if (input.charAt(0) == '-') {
if (len > 1) {
++i;
}
}
for (; i < len; ++i) {
char c = input.charAt(i);
if (c > '9' || c < '0') {
// invalid... error or default?
return defaultValue;
}
}
// let's allow both positive (unsigned 32 int) and negative (signed); to do that
// need to parse as Long, cast down.
try {
return (int) Long.parseLong(input);
} catch (IllegalArgumentException e) {
return defaultValue;
}
}
private final long _decodeLong(String input, long defaultValue)
{
if (input == null || input.length() == 0) {
return defaultValue;
}
if ("0".equals(input)) {
return 0L;
}
final int len = input.length();
int i = 0;
if (input.charAt(0) == '-') {
if (len > 1) {
++i;
}
}
for (; i < len; ++i) {
char c = input.charAt(i);
if (c > '9' || c < '0') {
// invalid... error or default?
return defaultValue;
}
}
// let's allow both positive (unsigned 32 int) and negative (signed); to do that
// need to parse as Long, cast down.
try {
return Long.parseLong(input);
} catch (IllegalArgumentException e) {
return defaultValue;
}
}
protected static Throwable _peel(Throwable t) {
while (t.getCause() != null) {
t = t.getCause();
}
return t;
}
/*
/**********************************************************************
/* Helper classes
/**********************************************************************
*/
protected static class FullListItemsCallback extends ListItemsCallback
{
public FullListItemsCallback(TimeMaster timeMaster, StoredEntryConverter entryConverter,
StorableKey prefix, ListLimits limits) {
super(timeMaster, entryConverter, prefix, limits);
}
@Override
protected ListItem toListItem(Storable entry) {
return _entryConverter.fullListItemFromStorable(entry);
}
}
protected static class ListItemsCallback extends StorableIterationCallback
{
protected final TimeMaster _timeMaster;
protected final StoredEntryConverter _entryConverter;
protected final StorableKey prefix;
protected final long maxTime;
protected final int maxEntries;
protected final boolean includeTombstones;
protected final ArrayList result = new ArrayList(100);
public int counter; // to avoid checking systime too often
public ListItemsCallback(TimeMaster timeMaster, StoredEntryConverter entryConverter,
StorableKey prefix, ListLimits limits)
{
_timeMaster = timeMaster;
_entryConverter = entryConverter;
maxTime = _timeMaster.currentTimeMillis() + limits.getMaxMsecs();
maxEntries = limits.getMaxEntries();
includeTombstones = limits.getIncludeTombstones();
this.prefix = prefix;
}
public List getResult() { return result; }
@Override
public IterationAction verifyKey(StorableKey key) {
if (!key.hasPrefix(prefix)) {
return IterationAction.TERMINATE_ITERATION;
}
if ((++counter & 15) == 0) { // check for every 16 items
if (!result.isEmpty()) { // do NOT terminate after at least one entry included
if (_timeMaster.currentTimeMillis() >= maxTime) {
return IterationAction.TERMINATE_ITERATION;
}
}
}
return IterationAction.PROCESS_ENTRY;
}
@Override
public IterationAction processEntry(Storable entry) throws StoreException
{
if (includeTombstones || !entry.isDeleted()) {
result.add(toListItem(entry));
if (result.size() >= maxEntries) {
return IterationAction.TERMINATE_ITERATION;
}
}
return IterationAction.PROCESS_ENTRY;
}
protected ListItem toListItem(Storable entry) {
return _entryConverter.minimalListItemFromStorable(entry);
}
}
}