NAME

Finance::Bitcoin::Feed - Collect bitcoin real-time price from many sites' streaming data source

SYNOPSIS

    use Finance::Bitcoin::Feed;

    #default output is to print to the stdout
    Finance::Bitcoin::Feed->new->run();
    # will print output to the stdout:
    # COINSETTER BTCUSD 123.00
    

    #or custom your stdout
    open  my $fh, ">out.txt";
    $fh->autoflush();
    my $feed = Finance::Bitcoin::Feed->new(output => sub{
       my ($self, $site, $currency, $price) = @_;
       print $fh "the price currency $currency on site $site is $price\n";
    });
    # let's go!
    $feed->run();

    #you can also custom which site you want to connect
    Finance::Bitcoin::Feed->new(sites => [qw(LakeBtc)])->go;

DESCRIPTION

Finance::Bitcoin::Feed is a bitcoin realtime data source which collect real time data source from these sites:

• HitBtc

• BtcChina

• CoinSetter

• <lakebtc api

The default output format to the stdout by this format:

   site_name TIMESTAMP CURRENCY price

For example:

   COINSETTER 1418173081724 BTCUSD 123.00

The unit of timestamp is ms.

You can custom your output by listen on the event output and modify the data it received.

Note the followiing sites doesn't give the timestamp. So the timestamp in the result will be 0:

LakeBtc

METHODS

This class inherits all methods from Mojo::EventEmitter

new

This method have two arguments by which you can costumize the behavior of the feed:

sites

which sites you want to connect. It is in fact the array reference of module names of Finance::Bitcoin::Feed::Site::*. Now it have 4 modules: Hitbtc BtcChina CoinSetter LakeBtc

You can also put your own site module under this namespace and added here.

output

customize the output format by giving this argument a sub reference. It will be bind to the event 'output'. Please rever to the event <output>.

   # you can customize the output by giving argument 'output' to the new methold
    open  my $fh, ">out.txt";
    $fh->autoflush();
    my $feed = Finance::Bitcoin::Feed->new(output => sub{
       my ($self, $site, $timestamp, $currency, $price) = @_;
       print $fh "the price currency $currency on site $site is $price\n";
    });
    # let's go!
    $feed->run();

EVENTS

This class inherits all events from Mojo::EventEmitter and add the following new ones:

output

This event has a default subscriber:

   #output to the stdout, the default action:
   $feed->on('output', sub { shift; say join " ", @_ } );

You can customize the output by giving argument 'output' to the new method

    open  my $fh, ">out.txt";
    $fh->autoflush();
    my $feed = Finance::Bitcoin::Feed->new(output => sub{
       my ($self, $site, $timestamp, $currency, $price) = @_;
       print $fh "the price currency $currency on site $site is $price\n";
    });
    # let's go!
    $feed->run();

Or you can bind output directly to the feed to get multi outout or you should unscribe this event first.

    $feed->on('output', sub {....})

The arguments of this event is:

$self: the site class object timestamp: the timestamp of the data. If no timestamp is given by the site, then the value of it is 0. sitename: the site class name price: the price

DEBUGGING

You can set the FINANCE_BITCOIN_FEED_DEBUG environment variable to get some advanced diagnostics information printed to STDERR. And these modules use Mojo::UserAgent, you can also open the MOJO_USERAGENT_DEBUG environment variable:

   FINANCE_BITCOIN_FEED_DEBUG=1
   MOJO_USERAGENT_DEBUG=1

SEE ALSO

Mojo::EventEmitter

Finance::Bitcoin::Feed::Site::Hitbtc

Finance::Bitcoin::Feed::Site::BtcChina

Finance::Bitcoin::Feed::Site::CoinSetter

Finance::Bitcoin::Feed::Site::LakeBtc

AUTHOR

Chylli <chylli@binary.com>

COPYRIGHT

Copyright 2014- Binary.com

cpanm Finance::Bitcoin::Feed

perl -MCPAN -e shell
install Finance::Bitcoin::Feed