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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
#include "mongo/platform/basic.h"
#include "mongo/db/query/getmore_request.h"
#include <boost/optional.hpp>
#include "mongo/db/commands.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/bson_extract_optime.h"
#include "mongo/idl/command_generic_argument.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
namespace mongo {
namespace {
const char kCollectionField[] = "collection";
const char kBatchSizeField[] = "batchSize";
const char kAwaitDataTimeoutField[] = "maxTimeMS";
const char kTermField[] = "term";
const char kLastKnownCommittedOpTimeField[] = "lastKnownCommittedOpTime";
const char kApiVersion[] = "apiVersion";
const char kApiStrict[] = "apiStrict";
const char kApiDeprecationErrors[] = "apiDeprecationErrors";
} // namespace
const char GetMoreRequest::kGetMoreCommandName[] = "getMore";
GetMoreRequest::GetMoreRequest() : cursorid(0), batchSize(0) {}
GetMoreRequest::GetMoreRequest(NamespaceString namespaceString,
CursorId id,
boost::optional<std::int64_t> sizeOfBatch,
boost::optional<Milliseconds> awaitDataTimeout,
boost::optional<long long> term,
boost::optional<repl::OpTime> lastKnownCommittedOpTime)
: nss(std::move(namespaceString)),
cursorid(id),
batchSize(sizeOfBatch),
awaitDataTimeout(awaitDataTimeout),
term(term),
lastKnownCommittedOpTime(lastKnownCommittedOpTime) {}
Status GetMoreRequest::isValid() const {
if (!nss.isValid()) {
return Status(ErrorCodes::InvalidNamespace,
str::stream() << "Invalid namespace for getMore: " << nss.ns());
}
if (cursorid == 0) {
return Status(ErrorCodes::BadValue, "Cursor id for getMore must be non-zero");
}
if (batchSize && *batchSize <= 0) {
return Status(ErrorCodes::BadValue,
str::stream() << "Batch size for getMore must be positive, "
<< "but received: " << *batchSize);
}
return Status::OK();
}
// static
StatusWith<GetMoreRequest> GetMoreRequest::parseFromBSON(const std::string& dbname,
const BSONObj& cmdObj) {
// Required fields.
boost::optional<CursorId> cursorid;
boost::optional<NamespaceString> nss;
// Optional fields.
boost::optional<std::int64_t> batchSize;
boost::optional<Milliseconds> awaitDataTimeout;
boost::optional<long long> term;
boost::optional<repl::OpTime> lastKnownCommittedOpTime;
for (BSONElement el : cmdObj) {
const auto fieldName = el.fieldNameStringData();
auto containsAPIParamField = fieldName == kApiVersion || fieldName == kApiStrict ||
fieldName == kApiDeprecationErrors;
uassert(4937600,
str::stream() << "Cannot pass in API parameter field " << fieldName,
!containsAPIParamField);
if (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 (fieldName == kCollectionField) {
if (el.type() != BSONType::String) {
return {ErrorCodes::TypeMismatch,
str::stream()
<< "Field 'collection' must be of type string in: " << cmdObj};
}
BSONElement collElt = cmdObj["collection"];
const std::string coll = (collElt.type() == BSONType::String) ? collElt.String() : "";
nss = NamespaceString(dbname, coll);
} else if (fieldName == kBatchSizeField) {
if (!el.isNumber()) {
return {ErrorCodes::TypeMismatch,
str::stream() << "Field 'batchSize' must be a number in: " << cmdObj};
}
batchSize = el.numberLong();
} else if (fieldName == kAwaitDataTimeoutField) {
auto maxAwaitDataTime = QueryRequest::parseMaxTimeMS(el);
if (!maxAwaitDataTime.isOK()) {
return maxAwaitDataTime.getStatus();
}
if (maxAwaitDataTime.getValue()) {
awaitDataTimeout = Milliseconds(maxAwaitDataTime.getValue());
}
} else if (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 (fieldName == kLastKnownCommittedOpTimeField) {
repl::OpTime ot;
Status status = bsonExtractOpTimeField(el.wrap(), kLastKnownCommittedOpTimeField, &ot);
if (!status.isOK()) {
return status;
}
lastKnownCommittedOpTime = ot;
} else if (!isGenericArgument(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 (!nss) {
return {ErrorCodes::FailedToParse,
str::stream() << "Field 'collection' missing in: " << cmdObj};
}
GetMoreRequest request(
std::move(*nss), *cursorid, batchSize, awaitDataTimeout, term, lastKnownCommittedOpTime);
Status validStatus = request.isValid();
if (!validStatus.isOK()) {
return validStatus;
}
return request;
}
BSONObj GetMoreRequest::toBSON() const {
BSONObjBuilder builder;
builder.append(kGetMoreCommandName, cursorid);
builder.append(kCollectionField, nss.coll());
if (batchSize) {
builder.append(kBatchSizeField, *batchSize);
}
if (awaitDataTimeout) {
builder.append(kAwaitDataTimeoutField, durationCount<Milliseconds>(*awaitDataTimeout));
}
if (term) {
builder.append(kTermField, *term);
}
if (lastKnownCommittedOpTime) {
lastKnownCommittedOpTime->append(&builder, kLastKnownCommittedOpTimeField);
}
return builder.obj();
}
} // namespace mongo
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