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'use strict' ;
var _ = require ( 'lodash' ) ;
var $ = require ( 'preconditions' ) . singleton ( ) ;
var log = require ( 'npmlog' ) ;
log . debug = log . verbose ;
var Explorers = require ( 'bitcore-explorers' ) ;
var request = require ( 'request' ) ;
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var io = require ( 'socket.io-client' ) ;
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function BlockChainExplorer ( opts ) {
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$ . checkArgument ( opts ) ;
var provider = opts . provider || 'insight' ;
var network = opts . network || 'livenet' ;
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var dfltUrl = network == 'livenet' ? 'https://insight.bitpay.com:443' :
'https://test-insight.bitpay.com:443' ;
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var url = opts . url || dfltUrl ;
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var url ;
switch ( provider ) {
case 'insight' :
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var explorer = new Explorers . Insight ( url , network ) ;
explorer . getTransactions = _ . bind ( getTransactionsInsight , explorer , url ) ;
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explorer . getAddressActivity = _ . bind ( getAddressActivityInsight , explorer , url ) ;
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explorer . initSocket = _ . bind ( initSocketInsight , explorer , url ) ;
return explorer ;
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default :
throw new Error ( 'Provider ' + provider + ' not supported' ) ;
} ;
} ;
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function getTransactionsInsight ( url , addresses , from , to , cb ) {
var qs = [ ] ;
if ( _ . isNumber ( from ) ) qs . push ( 'from=' + from ) ;
if ( _ . isNumber ( to ) ) qs . push ( 'to=' + to ) ;
var url = url + '/api/addrs/txs' + ( qs . length > 0 ? '?' + qs . join ( '&' ) : '' ) ;
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var args = {
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method : "POST" ,
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url : url ,
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json : {
addrs : [ ] . concat ( addresses ) . join ( ',' )
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} ,
} ;
request ( args , function ( err , res , txs ) {
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if ( err || res . statusCode != 200 ) return cb ( err || res ) ;
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// NOTE: Whenever Insight breaks communication with bitcoind, it returns invalid data but no error code.
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if ( ! _ . isArray ( txs ) || ( txs . length != _ . compact ( txs ) . length ) ) return cb ( new Error ( 'Could not retrieve transactions from blockchain. Request was:' + JSON . stringify ( args ) ) ) ;
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return cb ( null , txs ) ;
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} ) ;
} ;
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function getAddressActivityInsight ( url , addresses , cb ) {
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getTransactionsInsight ( url , addresses , null , null , function ( err , result ) {
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if ( err ) return cb ( err ) ;
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return cb ( null , result && result . length > 0 ) ;
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} ) ;
} ;
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function initSocketInsight ( url ) {
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var socket = io . connect ( url , {
'reconnection' : true ,
} ) ;
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return socket ;
} ;
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module . exports = BlockChainExplorer ;