/
commands_public.cpp
1710 lines (1400 loc) · 73.7 KB
/
commands_public.cpp
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// s/commands_public.cpp
/**
* Copyright (C) 2008 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/>.
*/
#include "pch.h"
#include "../util/net/message.h"
#include "../db/dbmessage.h"
#include "../client/connpool.h"
#include "../client/parallel.h"
#include "../db/commands.h"
#include "../db/pipeline/pipeline.h"
#include "../db/pipeline/document_source.h"
#include "../db/pipeline/expression_context.h"
#include "../db/queryutil.h"
#include "s/interrupt_status_mongos.h"
#include "../scripting/engine.h"
#include "../util/timer.h"
#include "mongo/db/lasterror.h"
#include "config.h"
#include "chunk.h"
#include "strategy.h"
#include "grid.h"
#include "client_info.h"
namespace mongo {
bool setParmsMongodSpecific(const string& dbname, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool fromRepl )
{
return true;
}
const char* fetchReplIndexPrefetchParam() {
return "unsupported";
}
namespace dbgrid_pub_cmds {
class PublicGridCommand : public Command {
public:
PublicGridCommand( const char* n, const char* oldname=NULL ) : Command( n, false, oldname ) {
}
virtual bool slaveOk() const {
return true;
}
virtual bool adminOnly() const {
return false;
}
// Override if passthrough should also send query options
// Safer as off by default, can slowly enable as we add more tests
virtual bool passOptions() const { return false; }
// all grid commands are designed not to lock
virtual LockType locktype() const { return NONE; }
protected:
bool passthrough( DBConfigPtr conf, const BSONObj& cmdObj , BSONObjBuilder& result ) {
return _passthrough(conf->getName(), conf, cmdObj, 0, result);
}
bool adminPassthrough( DBConfigPtr conf, const BSONObj& cmdObj , BSONObjBuilder& result ) {
return _passthrough("admin", conf, cmdObj, 0, result);
}
bool passthrough( DBConfigPtr conf, const BSONObj& cmdObj , int options, BSONObjBuilder& result ) {
return _passthrough(conf->getName(), conf, cmdObj, options, result);
}
bool adminPassthrough( DBConfigPtr conf, const BSONObj& cmdObj , int options, BSONObjBuilder& result ) {
return _passthrough("admin", conf, cmdObj, options, result);
}
private:
bool _passthrough(const string& db, DBConfigPtr conf, const BSONObj& cmdObj , int options , BSONObjBuilder& result ) {
ShardConnection conn( conf->getPrimary() , "" );
BSONObj res;
bool ok = conn->runCommand( db , cmdObj , res , passOptions() ? options : 0 );
if ( ! ok && res["code"].numberInt() == SendStaleConfigCode ) {
conn.done();
throw RecvStaleConfigException( "command failed because of stale config", res );
}
result.appendElements( res );
conn.done();
return ok;
}
};
class RunOnAllShardsCommand : public Command {
public:
RunOnAllShardsCommand(const char* n, const char* oldname=NULL) : Command(n, false, oldname) {}
virtual bool slaveOk() const { return true; }
virtual bool adminOnly() const { return false; }
// all grid commands are designed not to lock
virtual LockType locktype() const { return NONE; }
// default impl uses all shards for DB
virtual void getShards(const string& dbName , BSONObj& cmdObj, set<Shard>& shards) {
DBConfigPtr conf = grid.getDBConfig( dbName , false );
conf->getAllShards(shards);
}
virtual void aggregateResults(const vector<BSONObj>& results, BSONObjBuilder& output) {}
// don't override
virtual bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& output, bool) {
LOG(1) << "RunOnAllShardsCommand db: " << dbName << " cmd:" << cmdObj << endl;
set<Shard> shards;
getShards(dbName, cmdObj, shards);
// TODO: Future is deprecated, replace with commandOp()
list< shared_ptr<Future::CommandResult> > futures;
for ( set<Shard>::const_iterator i=shards.begin(), end=shards.end() ; i != end ; i++ ) {
futures.push_back( Future::spawnCommand( i->getConnString() , dbName , cmdObj, 0 ) );
}
vector<BSONObj> results;
BSONObjBuilder subobj (output.subobjStart("raw"));
BSONObjBuilder errors;
for ( list< shared_ptr<Future::CommandResult> >::iterator i=futures.begin(); i!=futures.end(); i++ ) {
shared_ptr<Future::CommandResult> res = *i;
if ( ! res->join() ) {
BSONObj result = res->result();
if( ! result["errmsg"].eoo() ){
errors.appendAs(res->result()["errmsg"], res->getServer());
}
else {
// Can happen if message is empty, for some reason
errors.append( res->getServer(), str::stream()
<< "result without error message returned : " << result );
}
}
results.push_back( res->result() );
subobj.append( res->getServer() , res->result() );
}
subobj.done();
BSONObj errobj = errors.done();
if (! errobj.isEmpty()) {
errmsg = errobj.toString(false, true);
return false;
}
aggregateResults(results, output);
return true;
}
};
class AllShardsCollectionCommand : public RunOnAllShardsCommand {
public:
AllShardsCollectionCommand(const char* n, const char* oldname=NULL) : RunOnAllShardsCommand(n, oldname) {}
virtual void getShards(const string& dbName , BSONObj& cmdObj, set<Shard>& shards) {
string fullns = dbName + '.' + cmdObj.firstElement().valuestrsafe();
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
shards.insert(conf->getShard(fullns));
}
else {
conf->getChunkManager(fullns)->getAllShards(shards);
}
}
};
class NotAllowedOnShardedCollectionCmd : public PublicGridCommand {
public:
NotAllowedOnShardedCollectionCmd( const char * n ) : PublicGridCommand( n ) {}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) = 0;
virtual bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string fullns = getFullNS( dbName , cmdObj );
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , options, result );
}
errmsg = "can't do command: " + name + " on sharded collection";
return false;
}
};
// ----
class DropIndexesCmd : public AllShardsCollectionCommand {
public:
DropIndexesCmd() : AllShardsCollectionCommand("dropIndexes", "deleteIndexes") {}
} dropIndexesCmd;
class ReIndexCmd : public AllShardsCollectionCommand {
public:
ReIndexCmd() : AllShardsCollectionCommand("reIndex") {}
} reIndexCmd;
class CollectionModCmd : public AllShardsCollectionCommand {
public:
CollectionModCmd() : AllShardsCollectionCommand("collMod") {}
} collectionModCmd;
class ProfileCmd : public PublicGridCommand {
public:
ProfileCmd() : PublicGridCommand("profile") {}
virtual bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
errmsg = "profile currently not supported via mongos";
return false;
}
} profileCmd;
class ValidateCmd : public AllShardsCollectionCommand {
public:
ValidateCmd() : AllShardsCollectionCommand("validate") {}
virtual void aggregateResults(const vector<BSONObj>& results, BSONObjBuilder& output) {
for (vector<BSONObj>::const_iterator it(results.begin()), end(results.end()); it!=end; it++){
const BSONObj& result = *it;
const BSONElement valid = result["valid"];
if (!valid.eoo()){
if (!valid.trueValue()) {
output.appendBool("valid", false);
return;
}
}
else {
// Support pre-1.9.0 output with everything in a big string
const char* s = result["result"].valuestrsafe();
if (strstr(s, "exception") || strstr(s, "corrupt")){
output.appendBool("valid", false);
return;
}
}
}
output.appendBool("valid", true);
}
} validateCmd;
class RepairDatabaseCmd : public RunOnAllShardsCommand {
public:
RepairDatabaseCmd() : RunOnAllShardsCommand("repairDatabase") {}
} repairDatabaseCmd;
class DBStatsCmd : public RunOnAllShardsCommand {
public:
DBStatsCmd() : RunOnAllShardsCommand("dbStats", "dbstats") {}
virtual void aggregateResults(const vector<BSONObj>& results, BSONObjBuilder& output) {
long long objects = 0;
long long dataSize = 0;
long long storageSize = 0;
long long numExtents = 0;
long long indexes = 0;
long long indexSize = 0;
long long fileSize = 0;
for (vector<BSONObj>::const_iterator it(results.begin()), end(results.end()); it != end; ++it) {
const BSONObj& b = *it;
objects += b["objects"].numberLong();
dataSize += b["dataSize"].numberLong();
storageSize += b["storageSize"].numberLong();
numExtents += b["numExtents"].numberLong();
indexes += b["indexes"].numberLong();
indexSize += b["indexSize"].numberLong();
fileSize += b["fileSize"].numberLong();
}
//result.appendNumber( "collections" , ncollections ); //TODO: need to find a good way to get this
output.appendNumber( "objects" , objects );
output.append ( "avgObjSize" , double(dataSize) / double(objects) );
output.appendNumber( "dataSize" , dataSize );
output.appendNumber( "storageSize" , storageSize);
output.appendNumber( "numExtents" , numExtents );
output.appendNumber( "indexes" , indexes );
output.appendNumber( "indexSize" , indexSize );
output.appendNumber( "fileSize" , fileSize );
}
} DBStatsCmdObj;
class CreateCmd : public PublicGridCommand {
public:
CreateCmd() : PublicGridCommand( "create" ) {}
bool run(const string& dbName,
BSONObj& cmdObj,
int,
string&,
BSONObjBuilder& result,
bool) {
DBConfigPtr conf = grid.getDBConfig( dbName , false );
return passthrough( conf , cmdObj , result );
}
} createCmd;
class DropCmd : public PublicGridCommand {
public:
DropCmd() : PublicGridCommand( "drop" ) {}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
log() << "DROP: " << fullns << endl;
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result );
}
//
// TODO: There will be problems if we simultaneously shard and drop a collection
//
ChunkManagerPtr cm;
ShardPtr primary;
conf->getChunkManagerOrPrimary( fullns, cm, primary );
if( ! cm ) return passthrough( conf , cmdObj , result );
cm->drop( cm );
if( ! conf->removeSharding( fullns ) ){
warning() << "collection " << fullns
<< " was reloaded as unsharded before drop completed"
<< " during single drop" << endl;
}
return 1;
}
} dropCmd;
class DropDBCmd : public PublicGridCommand {
public:
DropDBCmd() : PublicGridCommand( "dropDatabase" ) {}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
// disallow dropping the config database from mongos
if( dbName == "config" ) {
errmsg = "Cannot drop 'config' database via mongos";
return false;
}
BSONElement e = cmdObj.firstElement();
if ( ! e.isNumber() || e.number() != 1 ) {
errmsg = "invalid params";
return 0;
}
DBConfigPtr conf = grid.getDBConfig( dbName, false );
log() << "DROP DATABASE: " << dbName << endl;
if ( ! conf ) {
result.append( "info" , "database didn't exist" );
return true;
}
// Make sure you have write auth to the database, otherwise you'll delete the
// database info from the config server before the command even reaches the shards.
if ( !ClientBasic::getCurrent()->getAuthenticationInfo()->isAuthorized( dbName ) ) {
result.append( "errmsg",
str::stream() << "Not authorized to drop db: " << dbName );
return false;
}
//
// Reload the database configuration so that we're sure a database entry exists
// TODO: This won't work with parallel dropping
//
grid.removeDBIfExists( *conf );
grid.getDBConfig( dbName );
// TODO: Make dropping logic saner and more tolerant of partial drops. This is
// particularly important since a database drop can be aborted by *any* collection
// with a distributed namespace lock taken (migrates/splits)
//
// Create a copy of the DB config object to drop, so that no one sees a weird
// intermediate version of the info
//
DBConfig confCopy( conf->getName() );
if( ! confCopy.load() ){
errmsg = "could not load database info to drop";
return false;
}
// Enable sharding so we can correctly retry failed drops
// This will re-drop old sharded entries if they exist
confCopy.enableSharding( false );
if ( ! confCopy.dropDatabase( errmsg ) )
return false;
result.append( "dropped" , dbName );
return true;
}
} dropDBCmd;
class RenameCollectionCmd : public PublicGridCommand {
public:
RenameCollectionCmd() : PublicGridCommand( "renameCollection" ) {}
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string fullnsFrom = cmdObj.firstElement().valuestrsafe();
string dbNameFrom = nsToDatabase( fullnsFrom.c_str() );
DBConfigPtr confFrom = grid.getDBConfig( dbNameFrom , false );
string fullnsTo = cmdObj["to"].valuestrsafe();
string dbNameTo = nsToDatabase( fullnsTo.c_str() );
DBConfigPtr confTo = grid.getDBConfig( dbNameTo , false );
uassert(13140, "Don't recognize source or target DB", confFrom && confTo);
uassert(13138, "You can't rename a sharded collection", !confFrom->isSharded(fullnsFrom));
uassert(13139, "You can't rename to a sharded collection", !confTo->isSharded(fullnsTo));
const Shard& shardTo = confTo->getShard(fullnsTo);
const Shard& shardFrom = confFrom->getShard(fullnsFrom);
uassert(13137, "Source and destination collections must be on same shard", shardFrom == shardTo);
return adminPassthrough( confFrom , cmdObj , result );
}
} renameCollectionCmd;
class CopyDBCmd : public PublicGridCommand {
public:
CopyDBCmd() : PublicGridCommand( "copydb" ) {}
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string todb = cmdObj.getStringField("todb");
uassert(13402, "need a todb argument", !todb.empty());
DBConfigPtr confTo = grid.getDBConfig( todb );
uassert(13398, "cant copy to sharded DB", !confTo->isShardingEnabled());
string fromhost = cmdObj.getStringField("fromhost");
if (!fromhost.empty()) {
return adminPassthrough( confTo , cmdObj , result );
}
else {
string fromdb = cmdObj.getStringField("fromdb");
uassert(13399, "need a fromdb argument", !fromdb.empty());
DBConfigPtr confFrom = grid.getDBConfig( fromdb , false );
uassert(13400, "don't know where source DB is", confFrom);
uassert(13401, "cant copy from sharded DB", !confFrom->isShardingEnabled());
BSONObjBuilder b;
BSONForEach(e, cmdObj) {
if (strcmp(e.fieldName(), "fromhost") != 0)
b.append(e);
}
b.append("fromhost", confFrom->getPrimary().getConnString());
BSONObj fixed = b.obj();
return adminPassthrough( confTo , fixed , result );
}
}
} copyDBCmd;
class CountCmd : public PublicGridCommand {
public:
CountCmd() : PublicGridCommand( "count" ) { }
virtual bool passOptions() const { return true; }
bool run( const string& dbName,
BSONObj& cmdObj,
int options,
string& errmsg,
BSONObjBuilder& result,
bool ){
const string collection = cmdObj.firstElement().valuestrsafe();
const string fullns = dbName + "." + collection;
BSONObjBuilder countCmdBuilder;
countCmdBuilder.append( "count", collection );
BSONObj filter;
if( cmdObj["query"].isABSONObj() ){
countCmdBuilder.append( "query", cmdObj["query"].Obj() );
filter = cmdObj["query"].Obj();
}
if( cmdObj["limit"].isNumber() ){
long long limit = cmdObj["limit"].numberLong();
/* We only need to factor in the skip value when sending to
* the shards if we have a value for limit, otherwise, we
* apply it only once we have collected all counts.
*/
if( limit != 0 && cmdObj["skip"].isNumber() ){
long long skip = cmdObj["skip"].numberLong();
uassert( 16260 , "skip has to be positive" , skip >= 0 );
if ( limit > 0 )
limit += skip;
else
limit -= skip;
}
countCmdBuilder.append( "limit", limit );
}
map<Shard, BSONObj> countResult;
SHARDED->commandOp( dbName, countCmdBuilder.done(),
options, fullns, filter, countResult );
long long total = 0;
BSONObjBuilder shardSubTotal( result.subobjStart( "shards" ));
for( map<Shard, BSONObj>::const_iterator iter = countResult.begin();
iter != countResult.end(); ++iter ){
const string& shardName = iter->first.getName();
if( iter->second["ok"].trueValue() ){
long long shardCount = iter->second["n"].numberLong();
shardSubTotal.appendNumber( shardName, shardCount );
total += shardCount;
}
else {
shardSubTotal.doneFast();
errmsg = "failed on : " + shardName;
result.append( "cause", iter->second );
return false;
}
}
shardSubTotal.doneFast();
total = applySkipLimit( total , cmdObj );
result.appendNumber( "n" , total );
return true;
}
} countCmd;
class CollectionStats : public PublicGridCommand {
public:
CollectionStats() : PublicGridCommand("collStats", "collstats") { }
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
result.appendBool("sharded", false);
result.append( "primary" , conf->getPrimary().getName() );
return passthrough( conf , cmdObj , result);
}
result.appendBool("sharded", true);
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 12594 , "how could chunk manager be null!" , cm );
set<Shard> servers;
cm->getAllShards(servers);
BSONObjBuilder shardStats;
map<string,long long> counts;
map<string,long long> indexSizes;
/*
long long count=0;
long long size=0;
long long storageSize=0;
*/
int nindexes=0;
bool warnedAboutIndexes = false;
for ( set<Shard>::iterator i=servers.begin(); i!=servers.end(); i++ ) {
BSONObj res;
{
scoped_ptr<ScopedDbConnection> conn(
ScopedDbConnection::getScopedDbConnection( i->getConnString() ) );
if ( ! conn->get()->runCommand( dbName , cmdObj , res ) ) {
errmsg = "failed on shard: " + res.toString();
return false;
}
conn->done();
}
BSONObjIterator j( res );
while ( j.more() ) {
BSONElement e = j.next();
if ( str::equals( e.fieldName() , "ns" ) ||
str::equals( e.fieldName() , "ok" ) ||
str::equals( e.fieldName() , "avgObjSize" ) ||
str::equals( e.fieldName() , "lastExtentSize" ) ||
str::equals( e.fieldName() , "paddingFactor" ) ) {
continue;
}
else if ( str::equals( e.fieldName() , "count" ) ||
str::equals( e.fieldName() , "size" ) ||
str::equals( e.fieldName() , "storageSize" ) ||
str::equals( e.fieldName() , "numExtents" ) ||
str::equals( e.fieldName() , "totalIndexSize" ) ) {
counts[e.fieldName()] += e.numberLong();
}
else if ( str::equals( e.fieldName() , "indexSizes" ) ) {
BSONObjIterator k( e.Obj() );
while ( k.more() ) {
BSONElement temp = k.next();
indexSizes[temp.fieldName()] += temp.numberLong();
}
}
else if ( str::equals( e.fieldName() , "flags" ) ) {
if ( ! result.hasField( e.fieldName() ) )
result.append( e );
}
else if ( str::equals( e.fieldName() , "nindexes" ) ) {
int myIndexes = e.numberInt();
if ( nindexes == 0 ) {
nindexes = myIndexes;
}
else if ( nindexes == myIndexes ) {
// no-op
}
else {
// hopefully this means we're building an index
if ( myIndexes > nindexes )
nindexes = myIndexes;
if ( ! warnedAboutIndexes ) {
result.append( "warning" , "indexes don't all match - ok if ensureIndex is running" );
warnedAboutIndexes = true;
}
}
}
else {
warning() << "mongos collstats doesn't know about: " << e.fieldName() << endl;
}
}
shardStats.append(i->getName(), res);
}
result.append("ns", fullns);
for ( map<string,long long>::iterator i=counts.begin(); i!=counts.end(); ++i )
result.appendNumber( i->first , i->second );
{
BSONObjBuilder ib( result.subobjStart( "indexSizes" ) );
for ( map<string,long long>::iterator i=indexSizes.begin(); i!=indexSizes.end(); ++i )
ib.appendNumber( i->first , i->second );
ib.done();
}
if ( counts["count"] > 0 )
result.append("avgObjSize", (double)counts["size"] / (double)counts["count"] );
else
result.append( "avgObjSize", 0.0 );
result.append("nindexes", nindexes);
result.append("nchunks", cm->numChunks());
result.append("shards", shardStats.obj());
return true;
}
} collectionStatsCmd;
class FindAndModifyCmd : public PublicGridCommand {
public:
FindAndModifyCmd() : PublicGridCommand("findAndModify", "findandmodify") { }
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result);
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13002 , "shard internal error chunk manager should never be null" , cm );
BSONObj filter = cmdObj.getObjectField("query");
uassert(13343, "query for sharded findAndModify must have shardkey", cm->hasShardKey(filter));
ChunkPtr chunk = cm->findChunk(filter);
ShardConnection conn( chunk->getShard() , fullns );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
conn.done();
if (!ok && res.getIntField("code") == RecvStaleConfigCode) { // code for RecvStaleConfigException
throw RecvStaleConfigException( "FindAndModify", res ); // Command code traps this and re-runs
}
if (ok) {
// check whether split is necessary (using update object for size heuristic)
ClientInfo *client = ClientInfo::get();
if (client != NULL && client->autoSplitOk()) {
chunk->splitIfShould( cmdObj.getObjectField("update").objsize() );
}
}
result.appendElements(res);
return ok;
}
} findAndModifyCmd;
class DataSizeCmd : public PublicGridCommand {
public:
DataSizeCmd() : PublicGridCommand("dataSize", "datasize") { }
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string fullns = cmdObj.firstElement().String();
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result);
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13407 , "how could chunk manager be null!" , cm );
BSONObj min = cmdObj.getObjectField( "min" );
BSONObj max = cmdObj.getObjectField( "max" );
BSONObj keyPattern = cmdObj.getObjectField( "keyPattern" );
uassert(13408, "keyPattern must equal shard key", cm->getShardKey().key() == keyPattern);
// yes these are doubles...
double size = 0;
double numObjects = 0;
int millis = 0;
set<Shard> shards;
cm->getShardsForRange(shards, min, max);
for ( set<Shard>::iterator i=shards.begin(), end=shards.end() ; i != end; ++i ) {
scoped_ptr<ScopedDbConnection> conn(
ScopedDbConnection::getScopedDbConnection( i->getConnString() ) );
BSONObj res;
bool ok = conn->get()->runCommand( conf->getName() , cmdObj , res );
conn->done();
if ( ! ok ) {
result.appendElements( res );
return false;
}
size += res["size"].number();
numObjects += res["numObjects"].number();
millis += res["millis"].numberInt();
}
result.append( "size", size );
result.append( "numObjects" , numObjects );
result.append( "millis" , millis );
return true;
}
} DataSizeCmd;
class ConvertToCappedCmd : public NotAllowedOnShardedCollectionCmd {
public:
ConvertToCappedCmd() : NotAllowedOnShardedCollectionCmd("convertToCapped") {}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) {
return dbName + "." + cmdObj.firstElement().valuestrsafe();
}
} convertToCappedCmd;
class GroupCmd : public NotAllowedOnShardedCollectionCmd {
public:
GroupCmd() : NotAllowedOnShardedCollectionCmd("group") {}
virtual bool passOptions() const { return true; }
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) {
return dbName + "." + cmdObj.firstElement().embeddedObjectUserCheck()["ns"].valuestrsafe();
}
} groupCmd;
class SplitVectorCmd : public NotAllowedOnShardedCollectionCmd {
public:
SplitVectorCmd() : NotAllowedOnShardedCollectionCmd("splitVector") {}
virtual bool passOptions() const { return true; }
virtual bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string x = cmdObj.firstElement().valuestrsafe();
if ( ! str::startsWith( x , dbName ) ) {
errmsg = str::stream() << "doing a splitVector across dbs isn't supported via mongos";
return false;
}
return NotAllowedOnShardedCollectionCmd::run( dbName , cmdObj , options , errmsg, result, false );
}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) {
return cmdObj.firstElement().valuestrsafe();
}
} splitVectorCmd;
class DistinctCmd : public PublicGridCommand {
public:
DistinctCmd() : PublicGridCommand("distinct") {}
virtual void help( stringstream &help ) const {
help << "{ distinct : 'collection name' , key : 'a.b' , query : {} }";
}
virtual bool passOptions() const { return true; }
bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , options, result );
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 10420 , "how could chunk manager be null!" , cm );
BSONObj query = getQuery(cmdObj);
set<Shard> shards;
cm->getShardsForQuery(shards, query);
set<BSONObj,BSONObjCmp> all;
int size = 32;
for ( set<Shard>::iterator i=shards.begin(), end=shards.end() ; i != end; ++i ) {
ShardConnection conn( *i , fullns );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res, options );
conn.done();
if ( ! ok ) {
result.appendElements( res );
return false;
}
BSONObjIterator it( res["values"].embeddedObject() );
while ( it.more() ) {
BSONElement nxt = it.next();
BSONObjBuilder temp(32);
temp.appendAs( nxt , "" );
all.insert( temp.obj() );
}
}
BSONObjBuilder b( size );
int n=0;
for ( set<BSONObj,BSONObjCmp>::iterator i = all.begin() ; i != all.end(); i++ ) {
b.appendAs( i->firstElement() , b.numStr( n++ ) );
}
result.appendArray( "values" , b.obj() );
return true;
}
} disinctCmd;
class FileMD5Cmd : public PublicGridCommand {
public:
FileMD5Cmd() : PublicGridCommand("filemd5") {}
virtual void help( stringstream &help ) const {
help << " example: { filemd5 : ObjectId(aaaaaaa) , root : \"fs\" }";
}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string fullns = dbName;
fullns += ".";
{
string root = cmdObj.getStringField( "root" );
if ( root.size() == 0 )
root = "fs";
fullns += root;
}
fullns += ".chunks";
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result );
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13091 , "how could chunk manager be null!" , cm );
if(cm->getShardKey().key() == BSON("files_id" << 1)) {
BSONObj finder = BSON("files_id" << cmdObj.firstElement());
map<Shard, BSONObj> resMap;
SHARDED->commandOp(dbName, cmdObj, 0, fullns, finder, resMap);
verify(resMap.size() == 1); // querying on shard key so should only talk to one shard
BSONObj res = resMap.begin()->second;
result.appendElements(res);
return res["ok"].trueValue();
}
else if (cm->getShardKey().key() == BSON("files_id" << 1 << "n" << 1)) {
int n = 0;
BSONObj lastResult;
while (true) {
// Theory of operation: Starting with n=0, send filemd5 command to shard
// with that chunk (gridfs chunk not sharding chunk). That shard will then
// compute a partial md5 state (passed in the "md5state" field) for all
// contiguous chunks that it has. When it runs out or hits a discontinuity
// (eg [1,2,7]) it returns what it has done so far. This is repeated as
// long as we keep getting more chunks. The end condition is when we go to
// look for chunk n and it doesn't exist. This means that the file's last
// chunk is n-1, so we return the computed md5 results.
BSONObjBuilder bb;
bb.appendElements(cmdObj);
bb.appendBool("partialOk", true);
bb.append("startAt", n);
if (!lastResult.isEmpty()){
bb.append(lastResult["md5state"]);
}
BSONObj shardCmd = bb.obj();
BSONObj finder = BSON("files_id" << cmdObj.firstElement() << "n" << n);
map<Shard, BSONObj> resMap;
try {
SHARDED->commandOp(dbName, shardCmd, 0, fullns, finder, resMap);
}
catch( DBException& e ){
//This is handled below and logged
resMap[Shard()] = BSON("errmsg" << e.what() << "ok" << 0);
}
verify(resMap.size() == 1); // querying on shard key so should only talk to one shard
BSONObj res = resMap.begin()->second;
bool ok = res["ok"].trueValue();
if (!ok) {
// Add extra info to make debugging easier
result.append("failedAt", n);
result.append("sentCommand", shardCmd);
BSONForEach(e, res){
if (!str::equals(e.fieldName(), "errmsg"))
result.append(e);
}
log() << "Sharded filemd5 failed: " << result.asTempObj() << endl;
errmsg = string("sharded filemd5 failed because: ") + res["errmsg"].valuestrsafe();
return false;
}
uassert(16246, "Shard " + conf->getName() + " is too old to support GridFS sharded by {files_id:1, n:1}",
res.hasField("md5state"));
lastResult = res;
int nNext = res["numChunks"].numberInt();
if (n == nNext){
// no new data means we've reached the end of the file
result.appendElements(res);
return true;
}
verify(nNext > n);
n = nNext;
}
verify(0);
}
// We could support arbitrary shard keys by sending commands to all shards but I don't think we should
errmsg = "GridFS fs.chunks collection must be sharded on either {files_id:1} or {files_id:1, n:1}";
return false;
}
} fileMD5Cmd;
class Geo2dFindNearCmd : public PublicGridCommand {