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/* Copyright (C) 2014 MongoDB 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/write_concern_options.h"
#include "mongo/base/status.h"
#include "mongo/db/field_parser.h"
namespace mongo {
using std::string;
namespace {
/**
* Controls how much a client cares about writes and serves as initializer for the pre-defined
* write concern options.
*
* Default is NORMAL.
*/
enum WriteConcern { W_NONE = 0, W_NORMAL = 1 };
const BSONField<bool> mongosSecondaryThrottleField("_secondaryThrottle", true);
const BSONField<bool> secondaryThrottleField("secondaryThrottle", true);
const BSONField<BSONObj> writeConcernField("writeConcern");
} // namespace
const char WriteConcernOptions::kMajority[] = "majority";
const BSONObj WriteConcernOptions::Default = BSONObj();
const BSONObj WriteConcernOptions::Acknowledged(BSON("w" << W_NORMAL));
const BSONObj WriteConcernOptions::Unacknowledged(BSON("w" << W_NONE));
const BSONObj WriteConcernOptions::Majority(BSON("w" << WriteConcernOptions::kMajority));
WriteConcernOptions::WriteConcernOptions(int numNodes, SyncMode sync, int timeout)
: syncMode(sync), wNumNodes(numNodes), wTimeout(timeout) {}
WriteConcernOptions::WriteConcernOptions(const std::string& mode, SyncMode sync, int timeout)
: syncMode(sync), wNumNodes(0), wMode(mode), wTimeout(timeout) {}
Status WriteConcernOptions::parse(const BSONObj& obj) {
if (obj.isEmpty()) {
return Status(ErrorCodes::FailedToParse, "write concern object cannot be empty");
}
BSONElement jEl = obj["j"];
if (!jEl.eoo() && !jEl.isNumber() && jEl.type() != Bool) {
return Status(ErrorCodes::FailedToParse, "j must be numeric or a boolean value");
}
const bool j = jEl.trueValue();
BSONElement fsyncEl = obj["fsync"];
if (!fsyncEl.eoo() && !fsyncEl.isNumber() && fsyncEl.type() != Bool) {
return Status(ErrorCodes::FailedToParse, "fsync must be numeric or a boolean value");
}
const bool fsync = fsyncEl.trueValue();
if (j && fsync)
return Status(ErrorCodes::FailedToParse, "fsync and j options cannot be used together");
if (j) {
syncMode = JOURNAL;
}
if (fsync) {
syncMode = FSYNC;
}
BSONElement e = obj["w"];
if (e.isNumber()) {
wNumNodes = e.numberInt();
} else if (e.type() == String) {
wMode = e.valuestrsafe();
} else if (e.eoo() || e.type() == jstNULL || e.type() == Undefined) {
wNumNodes = 1;
} else {
return Status(ErrorCodes::FailedToParse, "w has to be a number or a string");
}
wTimeout = obj["wtimeout"].numberInt();
return Status::OK();
}
Status WriteConcernOptions::parseSecondaryThrottle(const BSONObj& doc,
BSONObj* rawWriteConcernObj) {
string errMsg;
bool isSecondaryThrottle;
FieldParser::FieldState fieldState =
FieldParser::extract(doc, secondaryThrottleField, &isSecondaryThrottle, &errMsg);
if (fieldState == FieldParser::FIELD_INVALID) {
return Status(ErrorCodes::FailedToParse, errMsg);
}
if (fieldState != FieldParser::FIELD_SET) {
fieldState =
FieldParser::extract(doc, mongosSecondaryThrottleField, &isSecondaryThrottle, &errMsg);
if (fieldState == FieldParser::FIELD_INVALID) {
return Status(ErrorCodes::FailedToParse, errMsg);
}
}
BSONObj dummyBSON;
if (!rawWriteConcernObj) {
rawWriteConcernObj = &dummyBSON;
}
fieldState = FieldParser::extract(doc, writeConcernField, rawWriteConcernObj, &errMsg);
if (fieldState == FieldParser::FIELD_INVALID) {
return Status(ErrorCodes::FailedToParse, errMsg);
}
if (!isSecondaryThrottle) {
if (!rawWriteConcernObj->isEmpty()) {
return Status(ErrorCodes::UnsupportedFormat,
"Cannot have write concern when secondary throttle is false");
}
wNumNodes = 1;
return Status::OK();
}
if (rawWriteConcernObj->isEmpty()) {
return Status(ErrorCodes::WriteConcernNotDefined,
"Secondary throttle is on, but write concern is not specified");
}
return parse(*rawWriteConcernObj);
}
BSONObj WriteConcernOptions::toBSON() const {
BSONObjBuilder builder;
if (wMode.empty()) {
builder.append("w", wNumNodes);
} else {
builder.append("w", wMode);
}
if (syncMode == FSYNC) {
builder.append("fsync", true);
} else if (syncMode == JOURNAL) {
builder.append("j", true);
}
builder.append("wtimeout", wTimeout);
return builder.obj();
}
bool WriteConcernOptions::shouldWaitForOtherNodes() const {
return !wMode.empty() || wNumNodes > 1;
}
}
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