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// export.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 "client/dbclient.h"
#include "db/json.h"
#include "tool.h"
#include <fstream>
#include <iostream>
#include <boost/program_options.hpp>
using namespace mongo;
namespace po = boost::program_options;
class Export : public Tool {
public:
Export() : Tool( "export" ) {
addFieldOptions();
add_options()
("query,q" , po::value<string>() , "query filter, as a JSON string" )
("csv","export to csv instead of json")
("out,o", po::value<string>(), "output file; if not specified, stdout is used")
("jsonArray", "output to a json array rather than one object per line")
("slaveOk,k", po::value<bool>()->default_value(true) , "use secondaries for export if available, default true")
;
_usesstdout = false;
}
virtual void preSetup() {
string out = getParam("out");
if ( out == "-" ) {
// write output to standard error to avoid mangling output
// must happen early to avoid sending junk to stdout
useStandardOutput(false);
}
}
virtual void printExtraHelp( ostream & out ) {
out << "Export MongoDB data to CSV, TSV or JSON files.\n" << endl;
}
// Turn every double quote character into two double quote characters
// If hasSurroundingQuotes is true, doesn't escape the first and last
// characters of the string, if it's false, add a double quote character
// around the whole string.
string csvEscape(string str, bool hasSurroundingQuotes = false) {
size_t index = hasSurroundingQuotes ? 1 : 0;
while (((index = str.find('"', index)) != string::npos)
&& (index < (hasSurroundingQuotes ? str.size() - 1 : str.size()))) {
str.replace(index, 1, "\"\"");
index += 2;
}
return hasSurroundingQuotes ? str : "\"" + str + "\"";
}
// Gets the string representation of a BSON object that can be correctly written to a CSV file
string csvString (const BSONElement& object) {
const char* binData; // Only used with BinData type
switch (object.type()) {
case MinKey:
return "$MinKey";
case MaxKey:
return "$MaxKey";
case NumberInt:
case NumberDouble:
case NumberLong:
case Bool:
return object.toString(false);
case String:
case Symbol:
return csvEscape(object.toString(false, true), true);
case Object:
return csvEscape(object.jsonString(Strict, false));
case Array:
return csvEscape(object.jsonString(Strict, false));
case BinData:
int len;
binData = object.binDataClean(len);
return toHex(binData, len);
case jstOID:
return "ObjectID(" + object.OID().toString() + ")"; // OIDs are always 24 bytes
case Date:
return timeToISOString(object.Date() / 1000);
case Timestamp:
return csvEscape(object.jsonString(Strict, false));
case RegEx:
return csvEscape("/" + string(object.regex()) + "/" + string(object.regexFlags()));
case Code:
return csvEscape(object.toString(false));
case CodeWScope:
if (string(object.codeWScopeScopeData()) == "") {
return csvEscape(object.toString(false));
} else {
return csvEscape(object.jsonString(Strict, false));
}
case EOO:
case Undefined:
case DBRef:
case jstNULL:
cerr << "Invalid BSON object type for CSV output: " << object.type() << endl;
return "";
}
// Can never get here
assert(false);
return "";
}
int run() {
string ns;
const bool csv = hasParam( "csv" );
const bool jsonArray = hasParam( "jsonArray" );
ostream *outPtr = &cout;
string outfile = getParam( "out" );
auto_ptr<ofstream> fileStream;
if ( hasParam( "out" ) ) {
size_t idx = outfile.rfind( "/" );
if ( idx != string::npos ) {
string dir = outfile.substr( 0 , idx + 1 );
create_directories( dir );
}
ofstream * s = new ofstream( outfile.c_str() , ios_base::out );
fileStream.reset( s );
outPtr = s;
if ( ! s->good() ) {
cerr << "couldn't open [" << outfile << "]" << endl;
return -1;
}
}
ostream &out = *outPtr;
BSONObj * fieldsToReturn = 0;
BSONObj realFieldsToReturn;
try {
ns = getNS();
}
catch (...) {
printHelp(cerr);
return 1;
}
auth();
if ( hasParam( "fields" ) || csv ) {
needFields();
// we can't use just _fieldsObj since we support everything getFieldDotted does
set<string> seen;
BSONObjBuilder b;
BSONObjIterator i( _fieldsObj );
while ( i.more() ){
BSONElement e = i.next();
string f = str::before( e.fieldName() , '.' );
if ( seen.insert( f ).second )
b.append( f , 1 );
}
realFieldsToReturn = b.obj();
fieldsToReturn = &realFieldsToReturn;
}
if ( csv && _fields.size() == 0 ) {
cerr << "csv mode requires a field list" << endl;
return -1;
}
Query q( getParam( "query" , "" ) );
if ( q.getFilter().isEmpty() && !hasParam("dbpath"))
q.snapshot();
bool slaveOk = _params["slaveOk"].as<bool>();
auto_ptr<DBClientCursor> cursor = conn().query( ns.c_str() , q , 0 , 0 , fieldsToReturn , ( slaveOk ? QueryOption_SlaveOk : 0 ) | QueryOption_NoCursorTimeout );
if ( csv ) {
for ( vector<string>::iterator i=_fields.begin(); i != _fields.end(); i++ ) {
if ( i != _fields.begin() )
out << ",";
out << *i;
}
out << endl;
}
if (jsonArray)
out << '[';
long long num = 0;
while ( cursor->more() ) {
num++;
BSONObj obj = cursor->next();
if ( csv ) {
for ( vector<string>::iterator i=_fields.begin(); i != _fields.end(); i++ ) {
if ( i != _fields.begin() )
out << ",";
const BSONElement & e = obj.getFieldDotted(i->c_str());
if ( ! e.eoo() ) {
out << csvString(e);
}
}
out << endl;
}
else {
if (jsonArray && num != 1)
out << ',';
out << obj.jsonString();
if (!jsonArray)
out << endl;
}
}
if (jsonArray)
out << ']' << endl;
cerr << "exported " << num << " records" << endl;
return 0;
}
};
int main( int argc , char ** argv ) {
Export e;
return e.main( argc , argv );
}
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