A small wrapper for uploading and downloading a file or multiple files using GridFS.
Programs using this library will require the following libraries for linking:
- libmongoclient (required for any mongodb communication)
- boost_filesystem
- boost_thread
- cryptopp
- Checking for existence of file before upload.
- Missed upload tracking
- Rudimentary progress meter when uploading multiple files
- Support for a regular expression of type mongo::BSONObj to filter the download query
The following is an example of how one might upload a list of files using this interface
mongo::HostAndPort server("server","port");
Uploader put;
put.connect("projects1",server);
string target_path;
if(argv[1] == NULL)
target_path = boost::filesystem::current_path().string();
else
target_path = argv[1];
//Our regular expression will match any pdf that starts with the word "forces"
const boost::regex my_filter( "(?i)forces.*\\.pdf" );
list<string> all_matching_files;
boost::filesystem::directory_iterator end_itr;
for( boost::filesystem::directory_iterator i(target_path); i != end_itr; ++i )
{
// Skip if no match
if( boost::regex_match( i->path().filename().string(), my_filter ) )
all_matching_files.push_back( i->path().string() );
}
//All files added to the list will be uploaded to a collection named "Warmachine"
put.uploadList(all_matching_files,"Warmachine");
//terminate the connection
put.logout();Similarly, we can download files with just as much ease
Downloader getter;
getter.connect("projects1",server);
string expr;
expr = ".*";
expr.append("forces").append(".*.pdf");
mongo::BSONObj reg = mongo::BSONObjBuilder().appendRegex("filename",expr,"i").obj();
getter.getFiles("Warmachine",reg);
getter.logout();