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dbclient.cpp
1577 lines (1301 loc) · 49.7 KB
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dbclient.cpp
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// dbclient.cpp - connect to a Mongo database as a database, from C++
/* Copyright 2009 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kNetwork
#include "mongo/platform/basic.h"
#include <utility>
#include "mongo/base/status.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/util/builder.h"
#include "mongo/client/authenticate.h"
#include "mongo/client/constants.h"
#include "mongo/client/dbclientcursor.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/client/replica_set_monitor.h"
#include "mongo/config.h"
#include "mongo/db/auth/internal_user_auth.h"
#include "mongo/db/commands.h"
#include "mongo/db/json.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/server_options.h"
#include "mongo/db/wire_version.h"
#include "mongo/executor/remote_command_request.h"
#include "mongo/executor/remote_command_response.h"
#include "mongo/rpc/factory.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/rpc/metadata.h"
#include "mongo/rpc/reply_interface.h"
#include "mongo/rpc/request_builder_interface.h"
#include "mongo/s/stale_exception.h" // for RecvStaleConfigException
#include "mongo/stdx/functional.h"
#include "mongo/stdx/memory.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/debug_util.h"
#include "mongo/util/log.h"
#include "mongo/util/net/sock.h"
#include "mongo/util/net/ssl_manager.h"
#include "mongo/util/net/ssl_options.h"
#include "mongo/util/password_digest.h"
namespace mongo {
using std::unique_ptr;
using std::endl;
using std::list;
using std::map;
using std::string;
using std::stringstream;
using std::vector;
using executor::RemoteCommandRequest;
using executor::RemoteCommandResponse;
namespace {
#ifdef MONGO_CONFIG_SSL
static SimpleMutex s_mtx;
static SSLManagerInterface* s_sslMgr(NULL);
SSLManagerInterface* sslManager() {
stdx::lock_guard<SimpleMutex> lk(s_mtx);
if (s_sslMgr) {
return s_sslMgr;
}
s_sslMgr = getSSLManager();
return s_sslMgr;
}
#endif
} // namespace
AtomicInt64 DBClientBase::ConnectionIdSequence;
const BSONField<BSONObj> Query::ReadPrefField("$readPreference");
const BSONField<string> Query::ReadPrefModeField("mode");
const BSONField<BSONArray> Query::ReadPrefTagsField("tags");
Query::Query(const string& json) : obj(fromjson(json)) {}
Query::Query(const char* json) : obj(fromjson(json)) {}
Query& Query::hint(const string& jsonKeyPatt) {
return hint(fromjson(jsonKeyPatt));
}
Query& Query::where(const string& jscode, BSONObj scope) {
/* use where() before sort() and hint() and explain(), else this will assert. */
verify(!isComplex());
BSONObjBuilder b;
b.appendElements(obj);
b.appendWhere(jscode, scope);
obj = b.obj();
return *this;
}
void Query::makeComplex() {
if (isComplex())
return;
BSONObjBuilder b;
b.append("query", obj);
obj = b.obj();
}
Query& Query::sort(const BSONObj& s) {
appendComplex("orderby", s);
return *this;
}
Query& Query::hint(BSONObj keyPattern) {
appendComplex("$hint", keyPattern);
return *this;
}
Query& Query::explain() {
appendComplex("$explain", true);
return *this;
}
Query& Query::snapshot() {
appendComplex("$snapshot", true);
return *this;
}
Query& Query::minKey(const BSONObj& val) {
appendComplex("$min", val);
return *this;
}
Query& Query::maxKey(const BSONObj& val) {
appendComplex("$max", val);
return *this;
}
bool Query::isComplex(const BSONObj& obj, bool* hasDollar) {
if (obj.hasElement("query")) {
if (hasDollar)
*hasDollar = false;
return true;
}
if (obj.hasElement("$query")) {
if (hasDollar)
*hasDollar = true;
return true;
}
return false;
}
Query& Query::readPref(ReadPreference pref, const BSONArray& tags) {
appendComplex(ReadPrefField.name().c_str(), ReadPreferenceSetting(pref, TagSet(tags)).toBSON());
return *this;
}
bool Query::isComplex(bool* hasDollar) const {
return isComplex(obj, hasDollar);
}
bool Query::hasReadPreference(const BSONObj& queryObj) {
const bool hasReadPrefOption = queryObj["$queryOptions"].isABSONObj() &&
queryObj["$queryOptions"].Obj().hasField(ReadPrefField.name());
bool canHaveReadPrefField = Query::isComplex(queryObj) ||
// The find command has a '$readPreference' option.
queryObj.firstElementFieldName() == StringData("find");
return (canHaveReadPrefField && queryObj.hasField(ReadPrefField.name())) || hasReadPrefOption;
}
BSONObj Query::getFilter() const {
bool hasDollar;
if (!isComplex(&hasDollar))
return obj;
return obj.getObjectField(hasDollar ? "$query" : "query");
}
BSONObj Query::getSort() const {
if (!isComplex())
return BSONObj();
BSONObj ret = obj.getObjectField("orderby");
if (ret.isEmpty())
ret = obj.getObjectField("$orderby");
return ret;
}
BSONObj Query::getHint() const {
if (!isComplex())
return BSONObj();
return obj.getObjectField("$hint");
}
bool Query::isExplain() const {
return isComplex() && obj.getBoolField("$explain");
}
string Query::toString() const {
return obj.toString();
}
/* --- dbclientcommands --- */
bool DBClientWithCommands::isOk(const BSONObj& o) {
return o["ok"].trueValue();
}
bool DBClientWithCommands::isNotMasterErrorString(const BSONElement& e) {
return e.type() == String && str::contains(e.valuestr(), "not master");
}
enum QueryOptions DBClientWithCommands::availableOptions() {
if (!_haveCachedAvailableOptions) {
_cachedAvailableOptions = _lookupAvailableOptions();
_haveCachedAvailableOptions = true;
}
return _cachedAvailableOptions;
}
enum QueryOptions DBClientWithCommands::_lookupAvailableOptions() {
BSONObj ret;
if (runCommand("admin", BSON("availablequeryoptions" << 1), ret)) {
return QueryOptions(ret.getIntField("options"));
}
return QueryOptions(0);
}
rpc::ProtocolSet DBClientWithCommands::getClientRPCProtocols() const {
return _clientRPCProtocols;
}
rpc::ProtocolSet DBClientWithCommands::getServerRPCProtocols() const {
return _serverRPCProtocols;
}
void DBClientWithCommands::setClientRPCProtocols(rpc::ProtocolSet protocols) {
_clientRPCProtocols = std::move(protocols);
}
void DBClientWithCommands::_setServerRPCProtocols(rpc::ProtocolSet protocols) {
_serverRPCProtocols = std::move(protocols);
}
void DBClientWithCommands::setRequestMetadataWriter(rpc::RequestMetadataWriter writer) {
_metadataWriter = std::move(writer);
}
const rpc::RequestMetadataWriter& DBClientWithCommands::getRequestMetadataWriter() {
return _metadataWriter;
}
void DBClientWithCommands::setReplyMetadataReader(rpc::ReplyMetadataReader reader) {
_metadataReader = std::move(reader);
}
const rpc::ReplyMetadataReader& DBClientWithCommands::getReplyMetadataReader() {
return _metadataReader;
}
rpc::UniqueReply DBClientWithCommands::runCommandWithMetadata(StringData database,
StringData command,
const BSONObj& metadata,
const BSONObj& commandArgs) {
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Database name '" << database << "' is not valid.",
NamespaceString::validDBName(database));
// call() oddly takes this by pointer, so we need to put it on the stack.
auto host = getServerAddress();
BSONObjBuilder metadataBob;
metadataBob.appendElements(metadata);
if (_metadataWriter) {
uassertStatusOK(_metadataWriter(&metadataBob, host));
}
auto requestBuilder = rpc::makeRequestBuilder(getClientRPCProtocols(), getServerRPCProtocols());
requestBuilder->setDatabase(database);
requestBuilder->setCommandName(command);
requestBuilder->setCommandArgs(commandArgs);
requestBuilder->setMetadata(metadataBob.done());
auto requestMsg = requestBuilder->done();
Message replyMsg;
// We always want to throw if there was a network error, we do it here
// instead of passing 'true' for the 'assertOk' parameter so we can construct a
// more helpful error message. Note that call() can itself throw a socket exception.
uassert(ErrorCodes::HostUnreachable,
str::stream() << "network error while attempting to run "
<< "command '" << command << "' "
<< "on host '" << host << "' ",
call(requestMsg, replyMsg, false, &host));
auto commandReply = rpc::makeReply(&replyMsg);
uassert(ErrorCodes::RPCProtocolNegotiationFailed,
str::stream() << "Mismatched RPC protocols - request was '"
<< networkOpToString(requestMsg.operation()) << "' '"
<< " but reply was '" << networkOpToString(replyMsg.operation()) << "' ",
requestBuilder->getProtocol() == commandReply->getProtocol());
if (ErrorCodes::SendStaleConfig ==
getStatusFromCommandResult(commandReply->getCommandReply())) {
throw RecvStaleConfigException("stale config in runCommand",
commandReply->getCommandReply());
}
if (_metadataReader) {
uassertStatusOK(_metadataReader(commandReply->getMetadata(), host));
}
return rpc::UniqueReply(std::move(replyMsg), std::move(commandReply));
}
bool DBClientWithCommands::runCommand(const string& dbname,
const BSONObj& cmd,
BSONObj& info,
int options) {
BSONObj upconvertedCmd;
BSONObj upconvertedMetadata;
// TODO: This will be downconverted immediately if the underlying
// requestBuilder is a legacyRequest builder. Not sure what the best
// way to get around that is without breaking the abstraction.
std::tie(upconvertedCmd, upconvertedMetadata) =
uassertStatusOK(rpc::upconvertRequestMetadata(cmd, options));
auto commandName = upconvertedCmd.firstElementFieldName();
auto result = runCommandWithMetadata(dbname, commandName, upconvertedMetadata, upconvertedCmd);
info = result->getCommandReply().getOwned();
return isOk(info);
}
/* note - we build a bson obj here -- for something that is super common like getlasterror you
should have that object prebuilt as that would be faster.
*/
bool DBClientWithCommands::simpleCommand(const string& dbname,
BSONObj* info,
const string& command) {
BSONObj o;
if (info == 0)
info = &o;
BSONObjBuilder b;
b.append(command, 1);
return runCommand(dbname, b.done(), *info);
}
bool DBClientWithCommands::runPseudoCommand(StringData db,
StringData realCommandName,
StringData pseudoCommandCol,
const BSONObj& cmdArgs,
BSONObj& info,
int options) {
BSONObjBuilder bob;
bob.append(realCommandName, 1);
bob.appendElements(cmdArgs);
auto cmdObj = bob.done();
bool success = false;
if (!(success = runCommand(db.toString(), cmdObj, info, options))) {
auto status = getStatusFromCommandResult(info);
verify(!status.isOK());
if (status == ErrorCodes::CommandResultSchemaViolation) {
msgasserted(28624,
str::stream() << "Received bad " << realCommandName
<< " response from server: " << info);
} else if (status == ErrorCodes::CommandNotFound) {
NamespaceString pseudoCommandNss(db, pseudoCommandCol);
// if this throws we just let it escape as that's how runCommand works.
info = findOne(pseudoCommandNss.ns(), cmdArgs, nullptr, options);
return true;
}
}
return success;
}
unsigned long long DBClientWithCommands::count(
const string& myns, const BSONObj& query, int options, int limit, int skip) {
BSONObj cmd = _countCmd(myns, query, options, limit, skip);
BSONObj res;
if (!runCommand(nsToDatabase(myns), cmd, res, options))
uasserted(11010, string("count fails:") + res.toString());
return res["n"].numberLong();
}
BSONObj DBClientWithCommands::_countCmd(
const string& myns, const BSONObj& query, int options, int limit, int skip) {
NamespaceString ns(myns);
BSONObjBuilder b;
b.append("count", ns.coll());
b.append("query", query);
if (limit)
b.append("limit", limit);
if (skip)
b.append("skip", skip);
return b.obj();
}
BSONObj DBClientWithCommands::getLastErrorDetailed(bool fsync, bool j, int w, int wtimeout) {
return getLastErrorDetailed("admin", fsync, j, w, wtimeout);
}
BSONObj DBClientWithCommands::getLastErrorDetailed(
const std::string& db, bool fsync, bool j, int w, int wtimeout) {
BSONObj info;
BSONObjBuilder b;
b.append("getlasterror", 1);
if (fsync)
b.append("fsync", 1);
if (j)
b.append("j", 1);
// only affects request when greater than one node
if (w >= 1)
b.append("w", w);
else if (w == -1)
b.append("w", "majority");
if (wtimeout > 0)
b.append("wtimeout", wtimeout);
runCommand(db, b.obj(), info);
return info;
}
string DBClientWithCommands::getLastError(bool fsync, bool j, int w, int wtimeout) {
return getLastError("admin", fsync, j, w, wtimeout);
}
string DBClientWithCommands::getLastError(
const std::string& db, bool fsync, bool j, int w, int wtimeout) {
BSONObj info = getLastErrorDetailed(db, fsync, j, w, wtimeout);
return getLastErrorString(info);
}
string DBClientWithCommands::getLastErrorString(const BSONObj& info) {
if (info["ok"].trueValue()) {
BSONElement e = info["err"];
if (e.eoo())
return "";
if (e.type() == Object)
return e.toString();
return e.str();
} else {
// command failure
BSONElement e = info["errmsg"];
if (e.eoo())
return "";
if (e.type() == Object)
return "getLastError command failed: " + e.toString();
return "getLastError command failed: " + e.str();
}
}
const BSONObj getpreverrorcmdobj = fromjson("{getpreverror:1}");
BSONObj DBClientWithCommands::getPrevError() {
BSONObj info;
runCommand("admin", getpreverrorcmdobj, info);
return info;
}
string DBClientWithCommands::createPasswordDigest(const string& username,
const string& clearTextPassword) {
return mongo::createPasswordDigest(username, clearTextPassword);
}
namespace {
class ScopedMetadataWriterRemover {
MONGO_DISALLOW_COPYING(ScopedMetadataWriterRemover);
public:
ScopedMetadataWriterRemover(DBClientWithCommands* cli)
: _cli(cli), _oldWriter(cli->getRequestMetadataWriter()) {
_cli->setRequestMetadataWriter(rpc::RequestMetadataWriter{});
}
~ScopedMetadataWriterRemover() {
_cli->setRequestMetadataWriter(_oldWriter);
}
private:
DBClientWithCommands* const _cli;
rpc::RequestMetadataWriter _oldWriter;
};
} // namespace
void DBClientWithCommands::_auth(const BSONObj& params) {
ScopedMetadataWriterRemover remover{this};
// We will only have a client name if SSL is enabled
std::string clientName = "";
#ifdef MONGO_CONFIG_SSL
if (sslManager() != nullptr) {
clientName = sslManager()->getSSLConfiguration().clientSubjectName;
}
#endif
auth::authenticateClient(
params,
HostAndPort(getServerAddress()).host(),
clientName,
[this](RemoteCommandRequest request, auth::AuthCompletionHandler handler) {
BSONObj info;
auto start = Date_t::now();
auto commandName = request.cmdObj.firstElementFieldName();
try {
auto reply = runCommandWithMetadata(
request.dbname, commandName, request.metadata, request.cmdObj);
BSONObj data = reply->getCommandReply().getOwned();
BSONObj metadata = reply->getMetadata().getOwned();
Milliseconds millis(Date_t::now() - start);
// Hand control back to authenticateClient()
handler(StatusWith<RemoteCommandResponse>(
RemoteCommandResponse(data, metadata, millis)));
} catch (...) {
handler(exceptionToStatus());
}
});
}
bool DBClientWithCommands::authenticateInternalUser() {
if (!isInternalAuthSet()) {
if (!serverGlobalParams.quiet) {
log() << "ERROR: No authentication parameters set for internal user";
}
return false;
}
try {
auth(getInternalUserAuthParamsWithFallback());
return true;
} catch (const UserException& ex) {
if (ex.getCode() == ErrorCodes::IncompatibleCatalogManager) {
throw;
}
if (!serverGlobalParams.quiet) {
log() << "can't authenticate to " << toString()
<< " as internal user, error: " << ex.what();
}
return false;
}
}
void DBClientWithCommands::auth(const BSONObj& params) {
_auth(params);
}
bool DBClientWithCommands::auth(const string& dbname,
const string& username,
const string& password_text,
string& errmsg,
bool digestPassword) {
try {
const auto authParams =
auth::buildAuthParams(dbname, username, password_text, digestPassword);
auth(authParams);
return true;
} catch (const UserException& ex) {
if (ex.getCode() != ErrorCodes::AuthenticationFailed)
throw;
errmsg = ex.what();
return false;
}
}
void DBClientWithCommands::logout(const string& dbname, BSONObj& info) {
runCommand(dbname, BSON("logout" << 1), info);
}
BSONObj ismastercmdobj = fromjson("{\"ismaster\":1}");
bool DBClientWithCommands::isMaster(bool& isMaster, BSONObj* info) {
BSONObj o;
if (info == 0)
info = &o;
bool ok = runCommand("admin", ismastercmdobj, *info);
isMaster = info->getField("ismaster").trueValue();
return ok;
}
bool DBClientWithCommands::createCollection(
const string& ns, long long size, bool capped, int max, BSONObj* info) {
verify(!capped || size);
BSONObj o;
if (info == 0)
info = &o;
BSONObjBuilder b;
string db = nsToDatabase(ns);
b.append("create", ns.c_str() + db.length() + 1);
if (size)
b.append("size", size);
if (capped)
b.append("capped", true);
if (max)
b.append("max", max);
return runCommand(db.c_str(), b.done(), *info);
}
bool DBClientWithCommands::copyDatabase(const string& fromdb,
const string& todb,
const string& fromhost,
BSONObj* info) {
BSONObj o;
if (info == 0)
info = &o;
BSONObjBuilder b;
b.append("copydb", 1);
b.append("fromhost", fromhost);
b.append("fromdb", fromdb);
b.append("todb", todb);
return runCommand("admin", b.done(), *info);
}
bool DBClientWithCommands::eval(const string& dbname,
const string& jscode,
BSONObj& info,
BSONElement& retValue,
BSONObj* args) {
BSONObjBuilder b;
b.appendCode("$eval", jscode);
if (args)
b.appendArray("args", *args);
bool ok = runCommand(dbname, b.done(), info);
if (ok)
retValue = info.getField("retval");
return ok;
}
bool DBClientWithCommands::eval(const string& dbname, const string& jscode) {
BSONObj info;
BSONElement retValue;
return eval(dbname, jscode, info, retValue);
}
list<string> DBClientWithCommands::getDatabaseNames() {
BSONObj info;
uassert(10005,
"listdatabases failed",
runCommand("admin", BSON("listDatabases" << 1), info, QueryOption_SlaveOk));
uassert(10006, "listDatabases.databases not array", info["databases"].type() == Array);
list<string> names;
BSONObjIterator i(info["databases"].embeddedObjectUserCheck());
while (i.more()) {
names.push_back(i.next().embeddedObjectUserCheck()["name"].valuestr());
}
return names;
}
list<string> DBClientWithCommands::getCollectionNames(const string& db) {
list<BSONObj> infos = getCollectionInfos(db);
list<string> names;
for (list<BSONObj>::iterator it = infos.begin(); it != infos.end(); ++it) {
names.push_back(db + "." + (*it)["name"].valuestr());
}
return names;
}
list<BSONObj> DBClientWithCommands::getCollectionInfos(const string& db, const BSONObj& filter) {
list<BSONObj> infos;
// first we're going to try the command
// it was only added in 3.0, so if we're talking to an older server
// we'll fail back to querying system.namespaces
// TODO(spencer): remove fallback behavior after 3.0
{
BSONObj res;
if (runCommand(db,
BSON("listCollections" << 1 << "filter" << filter << "cursor" << BSONObj()),
res,
QueryOption_SlaveOk)) {
BSONObj cursorObj = res["cursor"].Obj();
BSONObj collections = cursorObj["firstBatch"].Obj();
BSONObjIterator it(collections);
while (it.more()) {
BSONElement e = it.next();
infos.push_back(e.Obj().getOwned());
}
const long long id = cursorObj["id"].Long();
if (id != 0) {
const std::string ns = cursorObj["ns"].String();
unique_ptr<DBClientCursor> cursor = getMore(ns, id, 0, 0);
while (cursor->more()) {
infos.push_back(cursor->nextSafe().getOwned());
}
}
return infos;
}
// command failed
int code = res["code"].numberInt();
string errmsg = res["errmsg"].valuestrsafe();
if (code == ErrorCodes::CommandNotFound || errmsg.find("no such cmd") != string::npos) {
// old version of server, ok, fall through to old code
} else {
uasserted(18630, str::stream() << "listCollections failed: " << res);
}
}
// SERVER-14951 filter for old version fallback needs to db qualify the 'name' element
BSONObjBuilder fallbackFilter;
if (filter.hasField("name") && filter["name"].type() == String) {
fallbackFilter.append("name", db + "." + filter["name"].str());
}
fallbackFilter.appendElementsUnique(filter);
string ns = db + ".system.namespaces";
unique_ptr<DBClientCursor> c =
query(ns.c_str(), fallbackFilter.obj(), 0, 0, 0, QueryOption_SlaveOk);
uassert(28611, str::stream() << "listCollections failed querying " << ns, c.get());
while (c->more()) {
BSONObj obj = c->nextSafe();
string ns = obj["name"].valuestr();
if (ns.find("$") != string::npos)
continue;
BSONObjBuilder b;
b.append("name", ns.substr(db.size() + 1));
b.appendElementsUnique(obj);
infos.push_back(b.obj());
}
return infos;
}
bool DBClientWithCommands::exists(const string& ns) {
BSONObj filter = BSON("name" << nsToCollectionSubstring(ns));
list<BSONObj> results = getCollectionInfos(nsToDatabase(ns), filter);
return !results.empty();
}
/* --- dbclientconnection --- */
void DBClientConnection::_auth(const BSONObj& params) {
if (autoReconnect) {
/* note we remember the auth info before we attempt to auth -- if the connection is broken,
* we will then have it for the next autoreconnect attempt.
*/
authCache[params[auth::getSaslCommandUserDBFieldName()].str()] = params.getOwned();
}
DBClientBase::_auth(params);
}
/** query N objects from the database into an array. makes sense mostly when you want a small
* number of results. if a huge number, use query() and iterate the cursor.
*/
void DBClientInterface::findN(vector<BSONObj>& out,
const string& ns,
Query query,
int nToReturn,
int nToSkip,
const BSONObj* fieldsToReturn,
int queryOptions) {
out.reserve(nToReturn);
unique_ptr<DBClientCursor> c =
this->query(ns, query, nToReturn, nToSkip, fieldsToReturn, queryOptions);
uassert(10276,
str::stream() << "DBClientBase::findN: transport error: " << getServerAddress()
<< " ns: " << ns << " query: " << query.toString(),
c.get());
if (c->hasResultFlag(ResultFlag_ShardConfigStale)) {
BSONObj error;
c->peekError(&error);
throw RecvStaleConfigException("findN stale config", error);
}
for (int i = 0; i < nToReturn; i++) {
if (!c->more())
break;
out.push_back(c->nextSafe().copy());
}
}
BSONObj DBClientInterface::findOne(const string& ns,
const Query& query,
const BSONObj* fieldsToReturn,
int queryOptions) {
vector<BSONObj> v;
findN(v, ns, query, 1, 0, fieldsToReturn, queryOptions);
return v.empty() ? BSONObj() : v[0];
}
namespace {
/**
* RAII class to force usage of OP_QUERY on a connection.
*/
class ScopedForceOpQuery {
public:
ScopedForceOpQuery(DBClientBase* conn)
: _conn(conn), _oldProtos(conn->getClientRPCProtocols()) {
_conn->setClientRPCProtocols(rpc::supports::kOpQueryOnly);
}
~ScopedForceOpQuery() {
_conn->setClientRPCProtocols(_oldProtos);
}
private:
DBClientBase* const _conn;
const rpc::ProtocolSet _oldProtos;
};
/**
* Initializes the wire version of conn, and returns the isMaster reply.
*/
StatusWith<executor::RemoteCommandResponse> initWireVersion(DBClientConnection* conn) {
try {
// We need to force the usage of OP_QUERY on this command, even if we have previously
// detected support for OP_COMMAND on a connection. This is necessary to handle the case
// where we reconnect to an older version of MongoDB running at the same host/port.
ScopedForceOpQuery forceOpQuery{conn};
BSONObjBuilder bob;
bob.append("isMaster", 1);
if (Command::testCommandsEnabled) {
// Only include the host:port of this process in the isMaster command request if test
// commands are enabled. mongobridge uses this field to identify the process opening a
// connection to it.
StringBuilder sb;
sb << getHostName() << ':' << serverGlobalParams.port;
bob.append("hostInfo", sb.str());
}
Date_t start{Date_t::now()};
auto result =
conn->runCommandWithMetadata("admin", "isMaster", rpc::makeEmptyMetadata(), bob.done());
Date_t finish{Date_t::now()};
BSONObj isMasterObj = result->getCommandReply().getOwned();
if (isMasterObj.hasField("minWireVersion") && isMasterObj.hasField("maxWireVersion")) {
int minWireVersion = isMasterObj["minWireVersion"].numberInt();
int maxWireVersion = isMasterObj["maxWireVersion"].numberInt();
conn->setWireVersions(minWireVersion, maxWireVersion);
}
return executor::RemoteCommandResponse{
std::move(isMasterObj), result->getMetadata().getOwned(), finish - start};
} catch (...) {
return exceptionToStatus();
}
}
} // namespace
bool DBClientConnection::connect(const HostAndPort& server, std::string& errmsg) {
auto connectStatus = connect(server);
if (!connectStatus.isOK()) {
errmsg = connectStatus.reason();
return false;
}
return true;
}
Status DBClientConnection::connect(const HostAndPort& serverAddress) {
auto connectStatus = connectSocketOnly(serverAddress);
if (!connectStatus.isOK()) {
return connectStatus;
}
auto swIsMasterReply = initWireVersion(this);
if (!swIsMasterReply.isOK()) {
_failed = true;
return swIsMasterReply.getStatus();
}
auto swProtocolSet = rpc::parseProtocolSetFromIsMasterReply(swIsMasterReply.getValue().data);
if (!swProtocolSet.isOK()) {
return swProtocolSet.getStatus();
}
_setServerRPCProtocols(swProtocolSet.getValue());
auto negotiatedProtocol =
rpc::negotiate(getServerRPCProtocols(),
rpc::computeProtocolSet(WireSpec::instance().minWireVersionOutgoing,
WireSpec::instance().maxWireVersionOutgoing));
if (!negotiatedProtocol.isOK()) {
return negotiatedProtocol.getStatus();
}
if (_hook) {
auto validationStatus = _hook(swIsMasterReply.getValue());
if (!validationStatus.isOK()) {
// Disconnect and mark failed.
_failed = true;
_port.reset();
return validationStatus;
}
}
return Status::OK();
}
Status DBClientConnection::connectSocketOnly(const HostAndPort& serverAddress) {
_serverAddress = serverAddress;
_failed = true;
// We need to construct a SockAddr so we can resolve the address.
SockAddr osAddr{serverAddress.host().c_str(), serverAddress.port()};
if (!osAddr.isValid()) {
return Status(ErrorCodes::InvalidOptions,
str::stream() << "couldn't initialize connection to host "
<< serverAddress.host() << ", address is invalid");
}
_port.reset(new MessagingPort(_so_timeout, _logLevel));
if (serverAddress.host().empty()) {
return Status(ErrorCodes::InvalidOptions,
str::stream() << "couldn't connect to server " << _serverAddress.toString()
<< ", host is empty");
}
if (osAddr.getAddr() == "0.0.0.0") {
return Status(ErrorCodes::InvalidOptions,
str::stream() << "couldn't connect to server " << _serverAddress.toString()
<< ", address resolved to 0.0.0.0");
}
_resolvedAddress = osAddr.getAddr();
if (!_port->connect(osAddr)) {
return Status(ErrorCodes::HostUnreachable,
str::stream() << "couldn't connect to server " << _serverAddress.toString()
<< ", connection attempt failed");
}
#ifdef MONGO_CONFIG_SSL
int sslModeVal = sslGlobalParams.sslMode.load();
if (sslModeVal == SSLParams::SSLMode_preferSSL || sslModeVal == SSLParams::SSLMode_requireSSL) {
if (!_port->secure(sslManager(), serverAddress.host())) {
return Status(ErrorCodes::SSLHandshakeFailed, "Failed to initialize SSL on connection");
}
}
#endif
_failed = false;
LOG(1) << "connected to server " << toString() << endl;
return Status::OK();