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/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/ops/update_driver.h"
#include "mongo/base/error_codes.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/mutable/algorithm.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/db/field_ref.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/db/matcher/extensions_callback_noop.h"
#include "mongo/db/ops/log_builder.h"
#include "mongo/db/ops/modifier_object_replace.h"
#include "mongo/db/ops/modifier_table.h"
#include "mongo/db/ops/path_support.h"
#include "mongo/util/embedded_builder.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace str = mongoutils::str;
namespace mb = mongo::mutablebson;
using std::unique_ptr;
using std::vector;
using pathsupport::EqualityMatches;
UpdateDriver::UpdateDriver(const Options& opts)
: _replacementMode(false),
_indexedFields(NULL),
_logOp(opts.logOp),
_modOptions(opts.modOptions),
_affectIndices(false),
_positional(false) {}
UpdateDriver::~UpdateDriver() {
clear();
}
Status UpdateDriver::parse(const BSONObj& updateExpr, const bool multi) {
clear();
// Check if the update expression is a full object replacement.
if (*updateExpr.firstElementFieldName() != '$') {
if (multi) {
return Status(ErrorCodes::FailedToParse, "multi update only works with $ operators");
}
// Modifiers expect BSONElements as input. But the input to object replace is, by
// definition, an object. We wrap the 'updateExpr' as the mod is expecting. Note
// that the wrapper is temporary so the object replace mod should make a copy of
// the object.
unique_ptr<ModifierObjectReplace> mod(new ModifierObjectReplace);
BSONObj wrapper = BSON("dummy" << updateExpr);
Status status = mod->init(wrapper.firstElement(), _modOptions);
if (!status.isOK()) {
return status;
}
_mods.push_back(mod.release());
// Register the fact that this driver will only do full object replacements.
_replacementMode = true;
return Status::OK();
}
// The update expression is made of mod operators, that is
// { <$mod>: {...}, <$mod>: {...}, ... }
BSONObjIterator outerIter(updateExpr);
while (outerIter.more()) {
BSONElement outerModElem = outerIter.next();
// Check whether this is a valid mod type.
modifiertable::ModifierType modType = modifiertable::getType(outerModElem.fieldName());
if (modType == modifiertable::MOD_UNKNOWN) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Unknown modifier: " << outerModElem.fieldName());
}
// Check whether there is indeed a list of mods under this modifier.
if (outerModElem.type() != Object) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Modifiers operate on fields but we found type "
<< typeName(outerModElem.type())
<< " instead. For example: {$mod: {<field>: ...}}"
<< " not {"
<< outerModElem.toString()
<< "}");
}
// Check whether there are indeed mods under this modifier.
if (outerModElem.embeddedObject().isEmpty()) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "'" << outerModElem.fieldName()
<< "' is empty. You must specify a field like so: "
"{"
<< outerModElem.fieldName()
<< ": {<field>: ...}}");
}
BSONObjIterator innerIter(outerModElem.embeddedObject());
while (innerIter.more()) {
BSONElement innerModElem = innerIter.next();
Status status = addAndParse(modType, innerModElem);
if (!status.isOK()) {
return status;
}
}
}
// Register the fact that there will be only $mod's in this driver -- no object
// replacement.
_replacementMode = false;
return Status::OK();
}
inline Status UpdateDriver::addAndParse(const modifiertable::ModifierType type,
const BSONElement& elem) {
if (elem.eoo()) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "'" << elem.fieldName() << "' has no value in : " << elem
<< " which is not allowed for any $"
<< type
<< " mod.");
}
unique_ptr<ModifierInterface> mod(modifiertable::makeUpdateMod(type));
dassert(mod.get());
bool positional = false;
Status status = mod->init(elem, _modOptions, &positional);
if (!status.isOK()) {
return status;
}
// If any modifier indicates that it requires a positional match, toggle the
// _positional flag to true.
_positional = _positional || positional;
_mods.push_back(mod.release());
return Status::OK();
}
Status UpdateDriver::populateDocumentWithQueryFields(OperationContext* txn,
const BSONObj& query,
const vector<FieldRef*>* immutablePaths,
mutablebson::Document& doc) const {
// We canonicalize the query to collapse $and/$or, and the namespace is not needed. Also,
// because this is for the upsert case, where we insert a new document if one was not found, the
// $where/$text clauses do not make sense, hence empty ExtensionsCallback.
auto qr = stdx::make_unique<QueryRequest>(NamespaceString(""));
qr->setFilter(query);
auto statusWithCQ = CanonicalQuery::canonicalize(txn, std::move(qr), ExtensionsCallbackNoop());
if (!statusWithCQ.isOK()) {
return statusWithCQ.getStatus();
}
unique_ptr<CanonicalQuery> cq = std::move(statusWithCQ.getValue());
return populateDocumentWithQueryFields(*cq, immutablePaths, doc);
}
Status UpdateDriver::populateDocumentWithQueryFields(const CanonicalQuery& query,
const vector<FieldRef*>* immutablePathsPtr,
mutablebson::Document& doc) const {
EqualityMatches equalities;
Status status = Status::OK();
if (isDocReplacement()) {
FieldRefSet pathsToExtract;
// TODO: Refactor update logic, make _id just another immutable field
static const FieldRef idPath("_id");
static const vector<FieldRef*> emptyImmutablePaths;
const vector<FieldRef*>& immutablePaths =
immutablePathsPtr ? *immutablePathsPtr : emptyImmutablePaths;
pathsToExtract.fillFrom(immutablePaths);
pathsToExtract.insert(&idPath);
// Extract only immutable fields from replacement-style
status =
pathsupport::extractFullEqualityMatches(*query.root(), pathsToExtract, &equalities);
} else {
// Extract all fields from op-style
status = pathsupport::extractEqualityMatches(*query.root(), &equalities);
}
if (!status.isOK())
return status;
status = pathsupport::addEqualitiesToDoc(equalities, &doc);
return status;
}
Status UpdateDriver::update(StringData matchedField,
mutablebson::Document* doc,
BSONObj* logOpRec,
FieldRefSet* updatedFields,
bool* docWasModified) {
// TODO: assert that update() is called at most once in a !_multi case.
// Use the passed in FieldRefSet
FieldRefSet* targetFields = updatedFields;
// If we didn't get a FieldRefSet* from the caller, allocate storage and use
// the unique_ptr for lifecycle management
unique_ptr<FieldRefSet> targetFieldScopedPtr;
if (!targetFields) {
targetFieldScopedPtr.reset(new FieldRefSet());
targetFields = targetFieldScopedPtr.get();
}
_affectIndices = (isDocReplacement() && (_indexedFields != NULL));
_logDoc.reset();
LogBuilder logBuilder(_logDoc.root());
// Ask each of the mods to type check whether they can operate over the current document
// and, if so, to change that document accordingly.
for (vector<ModifierInterface*>::iterator it = _mods.begin(); it != _mods.end(); ++it) {
ModifierInterface::ExecInfo execInfo;
Status status = (*it)->prepare(doc->root(), matchedField, &execInfo);
if (!status.isOK()) {
return status;
}
// If a mod wants to be applied only if this is an upsert (or only if this is a
// strict update), we should respect that. If a mod doesn't care, it would state
// it is fine with ANY update context.
const bool validContext = (execInfo.context == ModifierInterface::ExecInfo::ANY_CONTEXT ||
execInfo.context == _context);
// Nothing to do if not in a valid context.
if (!validContext) {
continue;
}
// Gather which fields this mod is interested on and whether these fields were
// "taken" by previous mods. Note that not all mods are multi-field mods. When we
// see an empty field, we may stop looking for others.
for (int i = 0; i < ModifierInterface::ExecInfo::MAX_NUM_FIELDS; i++) {
if (execInfo.fieldRef[i] == 0) {
break;
}
// Record each field being updated but check for conflicts first
const FieldRef* other;
if (!targetFields->insert(execInfo.fieldRef[i], &other)) {
return Status(ErrorCodes::ConflictingUpdateOperators,
str::stream() << "Cannot update '" << other->dottedField()
<< "' and '"
<< execInfo.fieldRef[i]->dottedField()
<< "' at the same time");
}
// We start with the expectation that a mod will be in-place. But if the mod
// touched an indexed field and the mod will indeed be executed -- that is, it
// is not a no-op and it is in a valid context -- then we switch back to a
// non-in-place mode.
//
// TODO: make mightBeIndexed and fieldRef like each other.
if (!_affectIndices && !execInfo.noOp && _indexedFields &&
_indexedFields->mightBeIndexed(execInfo.fieldRef[i]->dottedField())) {
_affectIndices = true;
doc->disableInPlaceUpdates();
}
}
if (!execInfo.noOp) {
status = (*it)->apply();
if (docWasModified)
*docWasModified = true;
if (!status.isOK()) {
return status;
}
}
// If we require a replication oplog entry for this update, go ahead and generate one.
if (!execInfo.noOp && _logOp && logOpRec) {
status = (*it)->log(&logBuilder);
if (!status.isOK()) {
return status;
}
}
}
if (_logOp && logOpRec)
*logOpRec = _logDoc.getObject();
return Status::OK();
}
size_t UpdateDriver::numMods() const {
return _mods.size();
}
bool UpdateDriver::isDocReplacement() const {
return _replacementMode;
}
bool UpdateDriver::modsAffectIndices() const {
return _affectIndices;
}
void UpdateDriver::refreshIndexKeys(const UpdateIndexData* indexedFields) {
_indexedFields = indexedFields;
}
bool UpdateDriver::logOp() const {
return _logOp;
}
void UpdateDriver::setLogOp(bool logOp) {
_logOp = logOp;
}
ModifierInterface::Options UpdateDriver::modOptions() const {
return _modOptions;
}
void UpdateDriver::setModOptions(ModifierInterface::Options modOpts) {
_modOptions = modOpts;
}
void UpdateDriver::setCollator(const CollatorInterface* collator) {
for (auto&& mod : _mods) {
mod->setCollator(collator);
}
_modOptions.collator = collator;
}
ModifierInterface::ExecInfo::UpdateContext UpdateDriver::context() const {
return _context;
}
void UpdateDriver::setContext(ModifierInterface::ExecInfo::UpdateContext context) {
_context = context;
}
BSONObj UpdateDriver::makeOplogEntryQuery(const BSONObj& doc, bool multi) const {
BSONObjBuilder idPattern;
BSONElement id;
// NOTE: If the matching object lacks an id, we'll log
// with the original pattern. This isn't replay-safe.
// It might make sense to suppress the log instead
// if there's no id.
if (doc.getObjectID(id)) {
idPattern.append(id);
return idPattern.obj();
} else {
uassert(16980,
str::stream() << "Multi-update operations require all documents to "
"have an '_id' field. "
<< doc.toString(),
!multi);
return doc;
}
}
void UpdateDriver::clear() {
for (vector<ModifierInterface*>::iterator it = _mods.begin(); it != _mods.end(); ++it) {
delete *it;
}
_mods.clear();
_indexedFields = NULL;
_replacementMode = false;
_positional = false;
}
} // namespace mongo
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