bool match(const mutablebson::ConstElement& element) final {
if (element.getType() == mongo::Object) {
return _matchExpr->matchesBSON(element.getValueObject());
} else {
return false;
}
}
void storageValid(mutablebson::ConstElement elem, const bool deep, std::uint32_t recursionLevel) {
uassert(ErrorCodes::BadValue, "Invalid elements cannot be stored.", elem.ok());
uassert(ErrorCodes::Overflow,
str::stream() << "Document exceeds maximum nesting depth of "
<< BSONDepth::getMaxDepthForUserStorage(),
recursionLevel <= BSONDepth::getMaxDepthForUserStorage());
// Field names of elements inside arrays are not meaningful in mutable bson,
// so we do not want to validate them.
const mutablebson::ConstElement& parent = elem.parent();
const bool childOfArray = parent.ok() ? (parent.getType() == BSONType::Array) : false;
if (!childOfArray) {
auto fieldName = elem.getFieldName();
// Cannot start with "$", unless dbref.
if (fieldName[0] == '$') {
validateDollarPrefixElement(elem);
}
}
if (deep) {
// Check children if there are any.
storageValidChildren(elem, deep, recursionLevel);
}
}
void UnsetNode::validateUpdate(mutablebson::ConstElement updatedElement,
mutablebson::ConstElement leftSibling,
mutablebson::ConstElement rightSibling,
std::uint32_t recursionLevel,
ModifyResult modifyResult) const {
invariant(modifyResult == ModifyResult::kNormalUpdate);
// We only need to check the left and right sibling to see if the removed element was part of a
// now invalid DBRef.
const bool doRecursiveCheck = false;
const uint32_t recursionLevelForCheck = 0;
if (leftSibling.ok()) {
storage_validation::storageValid(leftSibling, doRecursiveCheck, recursionLevelForCheck);
}
if (rightSibling.ok()) {
storage_validation::storageValid(rightSibling, doRecursiveCheck, recursionLevelForCheck);
}
}
bool ModifierPull::isMatch(mutablebson::ConstElement element) {
// TODO: We are assuming that 'element' hasValue is true. That might be OK if the
// conflict detection logic will prevent us from ever seeing a deserialized element,
// but are we sure about that?
dassert(element.hasValue());
if (!_matchExpr)
return (element.compareWithBSONElement(_exprElt, _collator, false) == 0);
if (_matcherOnPrimitive) {
// TODO: This is kinda slow.
BSONObj candidate = element.getValue().wrap("");
return _matchExpr->matchesBSON(candidate);
}
if (element.getType() != Object)
return false;
return _matchExpr->matchesBSON(element.getValueObject());
}
bool match(const mutablebson::ConstElement& element) final {
BSONObj candidate = element.getValue().wrap("");
return _matchExpr->matchesBSON(candidate);
}
bool match(const mutablebson::ConstElement& element) final {
return (element.compareWithBSONElement(_modExpr, _collator, false) == 0);
}
/**
* This will verify that all updated fields are
* 1.) Valid for storage (checking parent to make sure things like DBRefs are valid)
* 2.) Compare updated immutable fields do not change values
*
* If updateFields is empty then it was replacement and/or we need to check all fields
*/
inline Status validate(const BSONObj& original,
const FieldRefSet& updatedFields,
const mb::Document& updated,
const std::vector<FieldRef*>* immutableAndSingleValueFields,
const ModifierInterface::Options& opts) {
LOG(3) << "update validate options -- "
<< " updatedFields: " << updatedFields << " immutableAndSingleValueFields.size:"
<< (immutableAndSingleValueFields ? immutableAndSingleValueFields->size() : 0)
<< " validate:" << opts.enforceOkForStorage;
// 1.) Loop through each updated field and validate for storage
// and detect immutable field updates
// The set of possibly changed immutable fields -- we will need to check their vals
FieldRefSet changedImmutableFields;
// Check to see if there were no fields specified or if we are not validating
// The case if a range query, or query that didn't result in saved fields
if (updatedFields.empty() || !opts.enforceOkForStorage) {
if (opts.enforceOkForStorage) {
// No specific fields were updated so the whole doc must be checked
Status s = storageValid(updated, true);
if (!s.isOK())
return s;
}
// Check all immutable fields
if (immutableAndSingleValueFields)
changedImmutableFields.fillFrom(*immutableAndSingleValueFields);
} else {
// TODO: Change impl so we don't need to create a new FieldRefSet
// -- move all conflict logic into static function on FieldRefSet?
FieldRefSet immutableFieldRef;
if (immutableAndSingleValueFields)
immutableFieldRef.fillFrom(*immutableAndSingleValueFields);
FieldRefSet::const_iterator where = updatedFields.begin();
const FieldRefSet::const_iterator end = updatedFields.end();
for (; where != end; ++where) {
const FieldRef& current = **where;
// Find the updated field in the updated document.
mutablebson::ConstElement newElem = updated.root();
size_t currentPart = 0;
while (newElem.ok() && currentPart < current.numParts())
newElem = newElem[current.getPart(currentPart++)];
// newElem might be missing if $unset/$renamed-away
if (newElem.ok()) {
// Check element, and its children
Status s = storageValid(newElem, true);
if (!s.isOK())
return s;
// Check parents to make sure they are valid as well.
s = storageValidParents(newElem);
if (!s.isOK())
return s;
}
// Check if the updated field conflicts with immutable fields
immutableFieldRef.findConflicts(¤t, &changedImmutableFields);
}
}
const bool checkIdField = (updatedFields.empty() && !original.isEmpty()) ||
updatedFields.findConflicts(&idFieldRef, NULL);
// Add _id to fields to check since it too is immutable
if (checkIdField)
changedImmutableFields.keepShortest(&idFieldRef);
else if (changedImmutableFields.empty()) {
// Return early if nothing changed which is immutable
return Status::OK();
}
LOG(4) << "Changed immutable fields: " << changedImmutableFields;
// 2.) Now compare values of the changed immutable fields (to make sure they haven't)
const mutablebson::ConstElement newIdElem = updated.root()[idFieldName];
FieldRefSet::const_iterator where = changedImmutableFields.begin();
const FieldRefSet::const_iterator end = changedImmutableFields.end();
for (; where != end; ++where) {
const FieldRef& current = **where;
// Find the updated field in the updated document.
mutablebson::ConstElement newElem = updated.root();
size_t currentPart = 0;
while (newElem.ok() && currentPart < current.numParts())
newElem = newElem[current.getPart(currentPart++)];
if (!newElem.ok()) {
if (original.isEmpty()) {
// If the _id is missing and not required, then skip this check
if (!(current.dottedField() == idFieldName))
return Status(ErrorCodes::NoSuchKey,
mongoutils::str::stream() << "After applying the update, the new"
<< " document was missing the '"
<< current.dottedField()
<< "' (required and immutable) field.");
} else {
if (current.dottedField() != idFieldName)
return Status(ErrorCodes::ImmutableField,
mongoutils::str::stream()
<< "After applying the update to the document with "
<< newIdElem.toString()
<< ", the '"
<< current.dottedField()
<< "' (required and immutable) field was "
"found to have been removed --"
<< original);
}
} else {
// Find the potentially affected field in the original document.
const BSONElement oldElem = dps::extractElementAtPath(original, current.dottedField());
const BSONElement oldIdElem = original.getField(idFieldName);
// Ensure no arrays since neither _id nor shard keys can be in an array, or one.
mb::ConstElement currElem = newElem;
while (currElem.ok()) {
if (currElem.getType() == Array) {
return Status(
ErrorCodes::NotSingleValueField,
mongoutils::str::stream()
<< "After applying the update to the document {"
<< (oldIdElem.ok() ? oldIdElem.toString() : newIdElem.toString())
<< " , ...}, the (immutable) field '"
<< current.dottedField()
<< "' was found to be an array or array descendant.");
}
currElem = currElem.parent();
}
// If we have both (old and new), compare them. If we just have new we are good
if (oldElem.ok() && newElem.compareWithBSONElement(oldElem, nullptr, false) != 0) {
return Status(ErrorCodes::ImmutableField,
mongoutils::str::stream()
<< "After applying the update to the document {"
<< oldElem.toString()
<< " , ...}, the (immutable) field '"
<< current.dottedField()
<< "' was found to have been altered to "
<< newElem.toString());
}
}
}
return Status::OK();
}
