Mango - Pure-Perl non-blocking I/O MongoDB driver


  use Mango;
  use feature state;

  # Declare a Mango helper
  sub mango { state $m = Mango->new('mongodb://localhost:27017') }
  # or in a Mojolicious::Lite app
  helper mango => sub { state $m = Mango->new('mongodb://localhost:27017') };

  # Insert document
  my $oid   = mango->db('test')->collection('foo')->insert({bar => 'baz'});

  # Find document
  my $doc = mango->db('test')->collection('foo')->find_one({bar => 'baz'});
  say $doc->{bar};

  # Update document
    ->update({bar => 'baz'}, {bar => 'yada'});

  # Remove document
  mango->db('test')->collection('foo')->remove({bar => 'yada'});

  # Insert document with special BSON types
  use Mango::BSON ':bson';
  my $oid = mango->db('test')->collection('foo')
    ->insert({data => bson_bin("\x00\x01"), now => bson_time});

  # Non-blocking concurrent find
  my $delay = Mojo::IOLoop->delay(sub {
    my ($delay, @docs) = @_;
  for my $name (qw(sri marty)) {
    my $end = $delay->begin(0);
    mango->db('test')->collection('users')->find({name => $name})->all(sub {
      my ($cursor, $err, $docs) = @_;

  # Event loops such as AnyEvent are supported through EV
  use EV;
  use AnyEvent;
  my $cv = AE::cv;
  mango->db('test')->command(buildInfo => sub {
    my ($db, $err, $doc) = @_;
  say $cv->recv;


Mango is a pure-Perl non-blocking I/O MongoDB driver, optimized for use with the Mojolicious real-time web framework, and with multiple event loop support. Since MongoDB is still changing rapidly, only the latest stable version is supported.

For MongoDB 2.6 support, use Mango 1.16.

To learn more about MongoDB you should take a look at the official documentation, the documentation included in this distribution is no replacement for it.

Look at Mango::Collection for CRUD operations.

Many arguments passed to methods as well as values of attributes get serialized to BSON with Mango::BSON, which provides many helper functions you can use to generate data types that are not available natively in Perl. All connections will be reset automatically if a new process has been forked, this allows multiple processes to share the same Mango object safely.

For better scalability (epoll, kqueue) and to provide IPv6, SOCKS5 as well as TLS support, the optional modules EV (4.0+), IO::Socket::IP (0.20+), IO::Socket::Socks (0.64+) and IO::Socket::SSL (1.84+) will be used automatically if they are installed. Individual features can also be disabled with the MOJO_NO_IPV6, MOJO_NO_SOCKS and MOJO_NO_TLS environment variables.


Mango inherits all events from Mojo::EventEmitter and can emit the following new ones.


  $mango->on(connection => sub {
    my ($mango, $id) = @_;

Emitted when a new connection has been established.


Mango implements the following attributes.


  my $name = $mango->default_db;
  $mango   = $mango->default_db('test');

Default database, defaults to admin.


  my $hosts = $mango->hosts;
  $mango    = $mango->hosts([['localhost', 3000], ['localhost', 4000]]);

Servers to connect to, defaults to localhost and port 27017.


  my $timeout = $mango->inactivity_timeout;
  $mango      = $mango->inactivity_timeout(15);

Maximum amount of time in seconds a connection can be inactive before getting closed, defaults to 0. Setting the value to 0 will allow connections to be inactive indefinitely.


  my $loop = $mango->ioloop;
  $mango   = $mango->ioloop(Mojo::IOLoop->new);

Event loop object to use for blocking I/O operations, defaults to a Mojo::IOLoop object.


  my $j  = $mango->j;
  $mango = $mango->j(1);

Wait for all operations to have reached the journal, defaults to 0.


  my $max = $mango->max_bson_size;
  $mango  = $mango->max_bson_size(16777216);

Maximum size for BSON documents in bytes, defaults to 16777216 (16MB).


  my $max = $mango->max_connections;
  $mango  = $mango->max_connections(5);

Maximum number of connections to use for non-blocking operations, defaults to 5.


  my $max = $mango->max_write_batch_size;
  $mango  = $mango->max_write_batch_size(1000);

Maximum number of write operations to batch together, defaults to 1000.


  my $protocol = $mango->protocol;
  $mango       = $mango->protocol(Mango::Protocol->new);

Protocol handler, defaults to a Mango::Protocol object.


  my $w  = $mango->w;
  $mango = $mango->w(2);

Wait for all operations to have reached at least this many servers, 1 indicates just primary, 2 indicates primary and at least one secondary, defaults to 1.


  my $timeout = $mango->wtimeout;
  $mango      = $mango->wtimeout(1);

Timeout for write propagation in milliseconds, defaults to 1000.


Mango inherits all methods from Mojo::Base and implements the following new ones.


  my $num = $mango->backlog;

Number of queued operations that have not yet been assigned to a connection.


  my $db = $mango->db;
  my $db = $mango->db('test');

Build Mango::Database object for database, uses "default_db" if no name is provided. Note that the reference "mango" in Mango::Database is weakened, so the Mango object needs to be referenced elsewhere as well.


    = $mango->from_string('mongodb://sri:s3cret@localhost:3000/test?w=2');

Parse configuration from connection string.


  my $reply = $mango->get_more($namespace, $return, $cursor);

Perform low level GET_MORE operation. You can also append a callback to perform operation non-blocking.

  $mango->get_more(($namespace, $return, $cursor) => sub {
    my ($mango, $err, $reply) = @_;
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;



Perform low level KILL_CURSORS operation. You can also append a callback to perform operation non-blocking.

    $mango->kill_cursors(@ids => sub {
      my ($mango, $err) = @_;
    Mojo::IOLoop->start unless Mojo::IOLoop->is_running;


  my $mango = Mango->new;
  my $mango = Mango->new('mongodb://sri:s3cret@localhost:3000/test?w=2');

  # Using TLS encryption
  my $mango = Mango->new('mongodb://', tls => 1,
    tls_cert => '/path/to/certificate.pem');

Construct a new Mango object and parse connection string with "from_string" if necessary.

Not that is is strongly recommended to build your Mango object inside a helper function like shown in the synopsis. This is because the Mango's object reference inside Mango::Database objects is weakened to avoid memory leaks. This means your Mango instance is quickly going to get undefined after you use the db method. So, use a helper to prevent that.

If a username and password are provided, Mango will try to authenticate using SCRAM-SHA1. Warning: this will require Authen::SCRAM which is not installed by default.

Any extra arguments given after the connection string will be passed to the connect method from Mojo::IOLoop::Client. To connect to a server using TLS, use the options tls (boolean), tls_cert and optionally tls_ca.


  my $reply
    = $mango->query($namespace, $flags, $skip, $return, $query, $fields);

Perform low level QUERY operation. You can also append a callback to perform operation non-blocking.

  $mango->query(($namespace, $flags, $skip, $return, $query, $fields) => sub {
    my ($mango, $err, $reply) = @_;
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;


You can set the MANGO_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.



Some of the work on this distribution has been sponsored by Drip Depot, thank you!


Sebastian Riedel,

Current maintainer: Olivier Duclos


In alphabetical order:


    Andrey Khozov

    Colin Cyr


Copyright (C) 2013-2014, Sebastian Riedel.

This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0.

SEE ALSO, Mojolicious::Guides,