Status ReplSetRequestVotesArgs::initialize(const BSONObj& argsObj) {
    Status status = bsonCheckOnlyHasFields("ReplSetRequestVotes", argsObj, kLegalArgsFieldNames);
    if (!status.isOK())
        return status;

    status = bsonExtractIntegerField(argsObj, kTermFieldName, &_term);
    if (!status.isOK())
        return status;

    status = bsonExtractIntegerField(argsObj, kCandidateIdFieldName, &_candidateId);
    if (!status.isOK())
        return status;

    status = bsonExtractIntegerField(argsObj, kConfigVersionFieldName, &_cfgver);
    if (!status.isOK())
        return status;

    status = bsonExtractStringField(argsObj, kSetNameFieldName, &_setName);
    if (!status.isOK())
        return status;

    status = bsonExtractBooleanField(argsObj, kDryRunFieldName, &_dryRun);
    if (!status.isOK())
        return status;

    status = bsonExtractOpTimeField(argsObj, kLastCommittedOpFieldName, &_lastCommittedOp);
    if (!status.isOK())
        return status;

    return Status::OK();
}
Status OldUpdatePositionArgs::initialize(const BSONObj& argsObj) {
    Status status = bsonCheckOnlyHasFieldsForCommand(
        "OldUpdatePositionArgs", argsObj, kLegalUpdatePositionFieldNames);

    if (!status.isOK())
        return status;

    // grab the array of changes
    BSONElement updateArray;
    status = bsonExtractTypedField(argsObj, kUpdateArrayFieldName, Array, &updateArray);
    if (!status.isOK())
        return status;

    // now parse each array entry into an update
    BSONObjIterator i(updateArray.Obj());
    while (i.more()) {
        BSONObj entry = i.next().Obj();
        status = bsonCheckOnlyHasFields("UpdateInfoArgs", entry, kLegalUpdateInfoFieldNames);
        if (!status.isOK())
            return status;

        OpTime opTime;
        if (entry[kOpTimeFieldName].isABSONObj()) {
            // In protocol version 1, { ts: <timestamp>, t: term }
            Status status = bsonExtractOpTimeField(entry, kOpTimeFieldName, &opTime);
            if (!status.isOK())
                return status;
        } else {
            Timestamp ts;
            status = bsonExtractTimestampField(entry, kOpTimeFieldName, &ts);
            if (!status.isOK())
                return status;
            opTime = OpTime(ts, OpTime::kUninitializedTerm);
        }
        if (!status.isOK())
            return status;

        // TODO(spencer): The following three fields are optional in 3.0, but should be made
        // required or ignored in 3.0
        long long cfgver;
        status = bsonExtractIntegerFieldWithDefault(entry, kConfigVersionFieldName, -1, &cfgver);
        if (!status.isOK())
            return status;

        OID rid;
        status = bsonExtractOIDFieldWithDefault(entry, kMemberRIDFieldName, OID(), &rid);
        if (!status.isOK())
            return status;

        long long memberID;
        status = bsonExtractIntegerFieldWithDefault(entry, kMemberIdFieldName, -1, &memberID);
        if (!status.isOK())
            return status;

        _updates.push_back(UpdateInfo(rid, opTime, cfgver, memberID));
    }

    return Status::OK();
}
Status ReadConcernArgs::initialize(const BSONElement& readConcernElem) {
    invariant(!_opTime && !_level);  // only legal to call on uninitialized object.

    if (readConcernElem.eoo()) {
        return Status::OK();
    }

    dassert(readConcernElem.fieldNameStringData() == kReadConcernFieldName);

    if (readConcernElem.type() != Object) {
        return Status(ErrorCodes::FailedToParse,
                      str::stream() << kReadConcernFieldName << " field should be an object");
    }

    BSONObj readConcernObj = readConcernElem.Obj();
    for (auto&& field : readConcernObj) {
        auto fieldName = field.fieldNameStringData();
        if (fieldName == kAfterOpTimeFieldName) {
            OpTime opTime;
            // TODO pass field in rather than scanning again.
            auto opTimeStatus =
                bsonExtractOpTimeField(readConcernObj, kAfterOpTimeFieldName, &opTime);
            if (!opTimeStatus.isOK()) {
                return opTimeStatus;
            }
            _opTime = opTime;
        } else if (fieldName == kLevelFieldName) {
            std::string levelString;
            // TODO pass field in rather than scanning again.
            auto readCommittedStatus =
                bsonExtractStringField(readConcernObj, kLevelFieldName, &levelString);
            if (!readCommittedStatus.isOK()) {
                return readCommittedStatus;
            }
            if (levelString == kLocalReadConcernStr) {
                _level = ReadConcernLevel::kLocalReadConcern;
            } else if (levelString == kMajorityReadConcernStr) {
                _level = ReadConcernLevel::kMajorityReadConcern;
            } else if (levelString == kLinearizableReadConcernStr) {
                _level = ReadConcernLevel::kLinearizableReadConcern;
            } else {
                return Status(
                    ErrorCodes::FailedToParse,
                    str::stream() << kReadConcernFieldName << '.' << kLevelFieldName
                                  << " must be either 'local', 'majority' or 'linearizable'");
            }
        } else {
            return Status(ErrorCodes::InvalidOptions,
                          str::stream() << "Unrecognized option in " << kReadConcernFieldName
                                        << ": "
                                        << fieldName);
        }
    }

    return Status::OK();
}
Example #4
0
StatusWith<boost::optional<repl::OpTime>>
ShardingRequestMetadata::extractConfigServerOpTimeIfPresent(const BSONObj& cmdObj) {
    repl::OpTime opTime;
    Status status = bsonExtractOpTimeField(cmdObj, kConfigsvrOpTimeFieldName, &opTime);
    if (status == ErrorCodes::NoSuchKey) {
        return {boost::none};
    } else if (!status.isOK()) {
        return status;
    }

    return {opTime};
}
StatusWith<ShardingMetadata> ShardingMetadata::readFromMetadata(const BSONObj& metadataObj) {
    BSONElement smElem;
    auto smExtractStatus =
        bsonExtractTypedField(metadataObj, kGLEStatsFieldName, mongol::Object, &smElem);
    if (!smExtractStatus.isOK()) {
        return smExtractStatus;
    }

    if (smElem.embeddedObject().nFields() != 2) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << "The $gleStats object can only have 2 fields, but got "
                                    << smElem.embeddedObject().toString());
    }

    repl::OpTime opTime;
    const BSONElement opTimeElement = smElem.embeddedObject()[kGLEStatsLastOpTimeFieldName];
    if (opTimeElement.eoo()) {
        return Status(ErrorCodes::NoSuchKey, "lastOpTime field missing");
    } else if (opTimeElement.type() == bsonTimestamp) {
        opTime = repl::OpTime(opTimeElement.timestamp(), repl::OpTime::kUninitializedTerm);
    } else if (opTimeElement.type() == Date) {
        opTime = repl::OpTime(Timestamp(opTimeElement.date()), repl::OpTime::kUninitializedTerm);
    } else if (opTimeElement.type() == Object) {
        Status status =
            bsonExtractOpTimeField(smElem.embeddedObject(), kGLEStatsLastOpTimeFieldName, &opTime);
        if (!status.isOK()) {
            return status;
        }
    } else {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kGLEStatsLastOpTimeFieldName
                                    << "\" field in response to replSetHeartbeat "
                                       "command to have type Date or Timestamp, but found type "
                                    << typeName(opTimeElement.type()));
    }

    BSONElement lastElectionIdElem;
    auto lastElectionIdExtractStatus = bsonExtractTypedField(
        smElem.embeddedObject(), kGLEStatsElectionIdFieldName, mongol::jstOID, &lastElectionIdElem);
    if (!lastElectionIdExtractStatus.isOK()) {
        return lastElectionIdExtractStatus;
    }

    return ShardingMetadata(opTime, lastElectionIdElem.OID());
}
Example #6
0
Status ReadConcernArgs::initialize(const BSONElement& readConcernElem) {
    if (readConcernElem.eoo()) {
        return Status::OK();
    }

    dassert(readConcernElem.fieldNameStringData() == kReadConcernFieldName);

    if (!readConcernElem.isABSONObj()) {
        return Status(ErrorCodes::FailedToParse,
                      str::stream() << kReadConcernFieldName << " field should be an object");
    }

    BSONObj readConcernObj = readConcernElem.Obj();

    if (readConcernObj.hasField(kAfterOpTimeFieldName)) {
        OpTime opTime;
        auto opTimeStatus = bsonExtractOpTimeField(readConcernObj, kAfterOpTimeFieldName, &opTime);
        if (!opTimeStatus.isOK()) {
            return opTimeStatus;
        }
        _opTime = opTime;
    }

    std::string levelString;
    auto readCommittedStatus =
        bsonExtractStringField(readConcernObj, kLevelFieldName, &levelString);
    if (readCommittedStatus.isOK()) {
        if (levelString == kLocalReadConcernStr) {
            _level = ReadConcernLevel::kLocalReadConcern;
        } else if (levelString == kMajorityReadConcernStr) {
            _level = ReadConcernLevel::kMajorityReadConcern;
        } else {
            return Status(ErrorCodes::FailedToParse,
                          str::stream() << kReadConcernFieldName << '.' << kLevelFieldName
                                        << " must be either \"local\" or \"majority\"");
        }
    } else if (readCommittedStatus != ErrorCodes::NoSuchKey) {
        return readCommittedStatus;
    }

    return Status::OK();
}
Example #7
0
Status ReadConcernArgs::initialize(const BSONElement& readConcernElem) {
    invariant(isEmpty());  // only legal to call on uninitialized object.

    if (readConcernElem.eoo()) {
        return Status::OK();
    }

    dassert(readConcernElem.fieldNameStringData() == kReadConcernFieldName);

    if (readConcernElem.type() != Object) {
        return Status(ErrorCodes::FailedToParse,
                      str::stream() << kReadConcernFieldName << " field should be an object");
    }

    BSONObj readConcernObj = readConcernElem.Obj();
    for (auto&& field : readConcernObj) {
        auto fieldName = field.fieldNameStringData();
        if (fieldName == kAfterOpTimeFieldName) {
            OpTime opTime;
            // TODO pass field in rather than scanning again.
            auto opTimeStatus =
                bsonExtractOpTimeField(readConcernObj, kAfterOpTimeFieldName, &opTime);
            if (!opTimeStatus.isOK()) {
                return opTimeStatus;
            }
            _opTime = opTime;
        } else if (fieldName == kAfterClusterTimeFieldName) {
            Timestamp afterClusterTime;
            auto afterClusterTimeStatus = bsonExtractTimestampField(
                readConcernObj, kAfterClusterTimeFieldName, &afterClusterTime);
            if (!afterClusterTimeStatus.isOK()) {
                return afterClusterTimeStatus;
            }
            _afterClusterTime = LogicalTime(afterClusterTime);
        } else if (fieldName == kAtClusterTimeFieldName) {
            Timestamp atClusterTime;
            auto atClusterTimeStatus =
                bsonExtractTimestampField(readConcernObj, kAtClusterTimeFieldName, &atClusterTime);
            if (!atClusterTimeStatus.isOK()) {
                return atClusterTimeStatus;
            }
            _atClusterTime = LogicalTime(atClusterTime);
        } else if (fieldName == kLevelFieldName) {
            std::string levelString;
            // TODO pass field in rather than scanning again.
            auto readCommittedStatus =
                bsonExtractStringField(readConcernObj, kLevelFieldName, &levelString);

            if (!readCommittedStatus.isOK()) {
                return readCommittedStatus;
            }

            if (levelString == kLocalReadConcernStr) {
                _level = ReadConcernLevel::kLocalReadConcern;
            } else if (levelString == kMajorityReadConcernStr) {
                _level = ReadConcernLevel::kMajorityReadConcern;
            } else if (levelString == kLinearizableReadConcernStr) {
                _level = ReadConcernLevel::kLinearizableReadConcern;
            } else if (levelString == kAvailableReadConcernStr) {
                _level = ReadConcernLevel::kAvailableReadConcern;
            } else if (levelString == kSnapshotReadConcernStr) {
                _level = ReadConcernLevel::kSnapshotReadConcern;
            } else {
                return Status(ErrorCodes::FailedToParse,
                              str::stream() << kReadConcernFieldName << '.' << kLevelFieldName
                                            << " must be either 'local', 'majority', "
                                               "'linearizable', 'available', or 'snapshot'");
            }
            _originalLevel = _level;
        } else {
            return Status(ErrorCodes::InvalidOptions,
                          str::stream() << "Unrecognized option in " << kReadConcernFieldName
                                        << ": "
                                        << fieldName);
        }
    }

    if (_afterClusterTime && _opTime) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << "Can not specify both " << kAfterClusterTimeFieldName
                                    << " and "
                                    << kAfterOpTimeFieldName);
    }

    if (_afterClusterTime && _atClusterTime) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << "Can not specify both " << kAfterClusterTimeFieldName
                                    << " and "
                                    << kAtClusterTimeFieldName);
    }

    // Note: 'available' should not be used with after cluster time, as cluster time can wait for
    // replication whereas the premise of 'available' is to avoid waiting. 'linearizable' should not
    // be used with after cluster time, since linearizable reads are inherently causally consistent.
    if (_afterClusterTime && getLevel() != ReadConcernLevel::kMajorityReadConcern &&
        getLevel() != ReadConcernLevel::kLocalReadConcern &&
        getLevel() != ReadConcernLevel::kSnapshotReadConcern) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << kAfterClusterTimeFieldName << " field can be set only if "
                                    << kLevelFieldName
                                    << " is equal to "
                                    << kMajorityReadConcernStr
                                    << ", "
                                    << kLocalReadConcernStr
                                    << ", or "
                                    << kSnapshotReadConcernStr);
    }

    if (_opTime && getLevel() == ReadConcernLevel::kSnapshotReadConcern) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << kAfterOpTimeFieldName << " field cannot be set if "
                                    << kLevelFieldName
                                    << " is equal to "
                                    << kSnapshotReadConcernStr);
    }

    if (_atClusterTime && getLevel() != ReadConcernLevel::kSnapshotReadConcern) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << kAtClusterTimeFieldName << " field can be set only if "
                                    << kLevelFieldName
                                    << " is equal to "
                                    << kSnapshotReadConcernStr);
    }

    if (_afterClusterTime && _afterClusterTime == LogicalTime::kUninitialized) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << kAfterClusterTimeFieldName << " cannot be a null timestamp");
    }

    if (_atClusterTime && _atClusterTime == LogicalTime::kUninitialized) {
        return Status(ErrorCodes::InvalidOptions,
                      str::stream() << kAtClusterTimeFieldName << " cannot be a null timestamp");
    }

    return Status::OK();
}
Example #8
0
// static
StatusWith<GetMoreRequest> GetMoreRequest::parseFromBSON(const std::string& dbname,
                                                         const BSONObj& cmdObj) {
    invariant(!dbname.empty());

    // Required fields.
    boost::optional<CursorId> cursorid;
    boost::optional<std::string> fullns;

    // Optional fields.
    boost::optional<long long> batchSize;
    boost::optional<Milliseconds> awaitDataTimeout;
    boost::optional<long long> term;
    boost::optional<repl::OpTime> lastKnownCommittedOpTime;

    for (BSONElement el : cmdObj) {
        const char* fieldName = el.fieldName();
        if (str::equals(fieldName, kGetMoreCommandName)) {
            if (el.type() != BSONType::NumberLong) {
                return {ErrorCodes::TypeMismatch,
                        str::stream() << "Field 'getMore' must be of type long in: " << cmdObj};
            }

            cursorid = el.Long();
        } else if (str::equals(fieldName, kCollectionField)) {
            if (el.type() != BSONType::String) {
                return {ErrorCodes::TypeMismatch,
                        str::stream() << "Field 'collection' must be of type string in: "
                                      << cmdObj};
            }

            fullns = parseNs(dbname, cmdObj);
        } else if (str::equals(fieldName, kBatchSizeField)) {
            if (!el.isNumber()) {
                return {ErrorCodes::TypeMismatch,
                        str::stream() << "Field 'batchSize' must be a number in: " << cmdObj};
            }

            batchSize = el.numberLong();
        } else if (str::equals(fieldName, kAwaitDataTimeoutField)) {
            auto maxAwaitDataTime = LiteParsedQuery::parseMaxTimeMS(el);
            if (!maxAwaitDataTime.isOK()) {
                return maxAwaitDataTime.getStatus();
            }

            if (maxAwaitDataTime.getValue()) {
                awaitDataTimeout = Milliseconds(maxAwaitDataTime.getValue());
            }
        } else if (str::equals(fieldName, kTermField)) {
            if (el.type() != BSONType::NumberLong) {
                return {ErrorCodes::TypeMismatch,
                        str::stream() << "Field 'term' must be of type NumberLong in: " << cmdObj};
            }
            term = el.Long();
        } else if (str::equals(fieldName, kLastKnownCommittedOpTimeField)) {
            repl::OpTime ot;
            Status status = bsonExtractOpTimeField(el.wrap(), kLastKnownCommittedOpTimeField, &ot);
            if (!status.isOK()) {
                return status;
            }
            lastKnownCommittedOpTime = ot;
        } else if (!str::startsWith(fieldName, "$")) {
            return {ErrorCodes::FailedToParse,
                    str::stream() << "Failed to parse: " << cmdObj << ". "
                                  << "Unrecognized field '"
                                  << fieldName
                                  << "'."};
        }
    }

    if (!cursorid) {
        return {ErrorCodes::FailedToParse,
                str::stream() << "Field 'getMore' missing in: " << cmdObj};
    }

    if (!fullns) {
        return {ErrorCodes::FailedToParse,
                str::stream() << "Field 'collection' missing in: " << cmdObj};
    }

    GetMoreRequest request(NamespaceString(*fullns),
                           *cursorid,
                           batchSize,
                           awaitDataTimeout,
                           term,
                           lastKnownCommittedOpTime);
    Status validStatus = request.isValid();
    if (!validStatus.isOK()) {
        return validStatus;
    }

    return request;
}
Status ReplSetHeartbeatResponse::initialize(const BSONObj& doc, long long term) {
    // Old versions set this even though they returned not "ok"
    _mismatch = doc[kMismatchFieldName].trueValue();
    if (_mismatch)
        return Status(ErrorCodes::InconsistentReplicaSetNames, "replica set name doesn't match.");

    // Old versions sometimes set the replica set name ("set") but ok:0
    const BSONElement replSetNameElement = doc[kReplSetFieldName];
    if (replSetNameElement.eoo()) {
        _setName.clear();
    } else if (replSetNameElement.type() != String) {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kReplSetFieldName
                                    << "\" field in response to replSetHeartbeat to have "
                                       "type String, but found "
                                    << typeName(replSetNameElement.type()));
    } else {
        _setName = replSetNameElement.String();
    }

    if (_setName.empty() && !doc[kOkFieldName].trueValue()) {
        std::string errMsg = doc[kErrMsgFieldName].str();

        BSONElement errCodeElem = doc[kErrorCodeFieldName];
        if (errCodeElem.ok()) {
            if (!errCodeElem.isNumber())
                return Status(ErrorCodes::BadValue, "Error code is not a number!");

            int errorCode = errCodeElem.numberInt();
            return Status(ErrorCodes::Error(errorCode), errMsg);
        }
        return Status(ErrorCodes::UnknownError, errMsg);
    }

    const BSONElement hasDataElement = doc[kHasDataFieldName];
    _hasDataSet = !hasDataElement.eoo();
    _hasData = hasDataElement.trueValue();

    const BSONElement electionTimeElement = doc[kElectionTimeFieldName];
    if (electionTimeElement.eoo()) {
        _electionTimeSet = false;
    } else if (electionTimeElement.type() == bsonTimestamp) {
        _electionTimeSet = true;
        _electionTime = electionTimeElement.timestamp();
    } else if (electionTimeElement.type() == Date) {
        _electionTimeSet = true;
        _electionTime = Timestamp(electionTimeElement.date());
    } else {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kElectionTimeFieldName
                                    << "\" field in response to replSetHeartbeat "
                                       "command to have type Date or Timestamp, but found type "
                                    << typeName(electionTimeElement.type()));
    }

    const BSONElement timeElement = doc[kTimeFieldName];
    if (timeElement.eoo()) {
        _timeSet = false;
    } else if (timeElement.isNumber()) {
        _timeSet = true;
        _time = Seconds(timeElement.numberLong());
    } else {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kTimeFieldName
                                    << "\" field in response to replSetHeartbeat "
                                       "command to have a numeric type, but found type "
                                    << typeName(timeElement.type()));
    }

    _isReplSet = doc[kIsReplSetFieldName].trueValue();

    Status termStatus = bsonExtractIntegerField(doc, kTermFieldName, &_term);
    if (!termStatus.isOK() && termStatus != ErrorCodes::NoSuchKey) {
        return termStatus;
    }

    // In order to support both the 3.0(V0) and 3.2(V1) heartbeats we must parse the OpTime
    // field based on its type. If it is a Date, we parse it as the timestamp and use
    // initialize's term argument to complete the OpTime type. If it is an Object, then it's
    // V1 and we construct an OpTime out of its nested fields.
    const BSONElement opTimeElement = doc[kOpTimeFieldName];
    if (opTimeElement.eoo()) {
        _opTimeSet = false;
    } else if (opTimeElement.type() == bsonTimestamp) {
        _opTimeSet = true;
        _opTime = OpTime(opTimeElement.timestamp(), term);
    } else if (opTimeElement.type() == Date) {
        _opTimeSet = true;
        _opTime = OpTime(Timestamp(opTimeElement.date()), term);
    } else if (opTimeElement.type() == Object) {
        Status status = bsonExtractOpTimeField(doc, kOpTimeFieldName, &_opTime);
        _opTimeSet = true;
        // since a v1 OpTime was in the response, the member must be part of a replset
        _isReplSet = true;
    } else {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kOpTimeFieldName
                                    << "\" field in response to replSetHeartbeat "
                                       "command to have type Date or Timestamp, but found type "
                                    << typeName(opTimeElement.type()));
    }

    const BSONElement electableElement = doc[kIsElectableFieldName];
    if (electableElement.eoo()) {
        _electableSet = false;
    } else {
        _electableSet = true;
        _electable = electableElement.trueValue();
    }

    const BSONElement memberStateElement = doc[kMemberStateFieldName];
    if (memberStateElement.eoo()) {
        _stateSet = false;
    } else if (memberStateElement.type() != NumberInt && memberStateElement.type() != NumberLong) {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream()
                          << "Expected \"" << kMemberStateFieldName
                          << "\" field in response to replSetHeartbeat "
                             "command to have type NumberInt or NumberLong, but found type "
                          << typeName(memberStateElement.type()));
    } else {
        long long stateInt = memberStateElement.numberLong();
        if (stateInt < 0 || stateInt > MemberState::RS_MAX) {
            return Status(ErrorCodes::BadValue,
                          str::stream()
                              << "Value for \"" << kMemberStateFieldName
                              << "\" in response to replSetHeartbeat is "
                                 "out of range; legal values are non-negative and no more than "
                              << MemberState::RS_MAX);
        }
        _stateSet = true;
        _state = MemberState(static_cast<int>(stateInt));
    }

    _stateDisagreement = doc[kHasStateDisagreementFieldName].trueValue();


    // Not required for the case of uninitialized members -- they have no config
    const BSONElement configVersionElement = doc[kConfigVersionFieldName];

    // If we have an optime then we must have a configVersion
    if (_opTimeSet && configVersionElement.eoo()) {
        return Status(ErrorCodes::NoSuchKey,
                      str::stream() << "Response to replSetHeartbeat missing required \""
                                    << kConfigVersionFieldName
                                    << "\" field even though initialized");
    }

    // If there is a "v" (config version) then it must be an int.
    if (!configVersionElement.eoo() && configVersionElement.type() != NumberInt) {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kConfigVersionFieldName
                                    << "\" field in response to replSetHeartbeat to have "
                                       "type NumberInt, but found "
                                    << typeName(configVersionElement.type()));
    }
    _configVersion = configVersionElement.numberInt();

    const BSONElement hbMsgElement = doc[kHbMessageFieldName];
    if (hbMsgElement.eoo()) {
        _hbmsg.clear();
    } else if (hbMsgElement.type() != String) {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kHbMessageFieldName
                                    << "\" field in response to replSetHeartbeat to have "
                                       "type String, but found " << typeName(hbMsgElement.type()));
    } else {
        _hbmsg = hbMsgElement.String();
    }

    const BSONElement syncingToElement = doc[kSyncSourceFieldName];
    if (syncingToElement.eoo()) {
        _syncingTo = HostAndPort();
    } else if (syncingToElement.type() != String) {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kSyncSourceFieldName
                                    << "\" field in response to replSetHeartbeat to "
                                       "have type String, but found "
                                    << typeName(syncingToElement.type()));
    } else {
        _syncingTo = HostAndPort(syncingToElement.String());
    }

    const BSONElement rsConfigElement = doc[kConfigFieldName];
    if (rsConfigElement.eoo()) {
        _configSet = false;
        _config = ReplicaSetConfig();
        return Status::OK();
    } else if (rsConfigElement.type() != Object) {
        return Status(ErrorCodes::TypeMismatch,
                      str::stream() << "Expected \"" << kConfigFieldName
                                    << "\" in response to replSetHeartbeat to have type "
                                       "Object, but found " << typeName(rsConfigElement.type()));
    }
    _configSet = true;

    return _config.initialize(rsConfigElement.Obj());
}