node-experiencepoints/lib/xp.js

XP Client

var http = require('http')
,   https = require('https')

var api  = require('./commands')
,   errors = require('./errors')

function Client(options) { 
    this.opts = {
        host:    'localhost'
     ,  port:    28191
     ,  method:  'POST'
     ,  user:    ''
     ,  pass:    ''
     ,  headers:  {
            'Host': 'localhost'
         ,  'Authorization':  ''
       }
     , passphrasecallback: null
     , https: false
     , ca: null
    }

    if (options) {
        this.set(options)
    }
}

Client.prototype = {

    invalid:function(command) {
        var args = Array.prototype.slice.call(arguments, 1)
        ,   fn   = args.pop()

        if (typeof fn !== 'function') {
            fn = console.log
        }

        return fn(new Error('No such command "' + command  + '"'))
    },

    send:function(command) {
        var args = Array.prototype.slice.call(arguments, 1)
         ,  self = this
         ,  fn
        
        if (typeof args[args.length-1] === 'function') {
            fn = args.pop().bind(this)
        }else {
            fn = console.log
        }

        var rpcData = JSON.stringify({
            id:      new Date().getTime()
         ,  method:  command.toLowerCase()
         ,  params:  args
        })

        var options = this.opts
        options.headers['Content-Length'] = rpcData.length

        var request;
        if (options.https === true){
          request = https.request;
        } else{ 
          request = http.request;
        }

        var req = request(options, function(res) {
            var data = ''
            res.setEncoding('utf8')
            res.on('data', function(chunk) {
                data += chunk
            })
            res.on('end', function() {
                try {
                    data = JSON.parse(data)
                }catch(exception) {
                    var errMsg = res.statusCode !== 200
                        ? 'Invalid params ' + res.statusCode
                        : 'Failed to parse JSON'
                    errMsg += ' : '+JSON.stringify(data)
                    return fn(new Error(errMsg))
                }
                if (data.error) {
                    if (data.error.code === errors.RPC_WALLET_UNLOCK_NEEDED &&
                        options.passphrasecallback) {
                      return self.unlock(command, args, fn)
                    } else {
                      var err = new Error(JSON.stringify(data))
                      err.code = data.error.code
                      return fn(err)
                    }
                }
                fn(null, data.result !== null ? data.result : data)
            })
        })

        req.on('error', fn)
        req.end(rpcData)
        return this
    },

    exec:function(command) {
        var func = api.isCommand(command) ? 'send' : 'invalid'
        return this[func].apply(this, arguments)
    },

    auth:function(user, pass) {
        if (user && pass) {
            var authString = ('Basic ') + new Buffer(user+':'+pass).toString('base64')
            this.opts.headers['Authorization'] = authString
        }
      return this
    },

    unlock:function(command, args, fn) {
      var self = this

      var retry = function(err) {
        if (err) {
          fn(err)
        } else {
          var sendargs = args.slice();
          sendargs.unshift(command);
          sendargs.push(fn)
          self.send.apply(self, sendargs)
        }
      }

      this.opts.passphrasecallback(command, args, function(err, passphrase, timeout) {
        if (err) {
          fn(err)
        } else {
          self.send('walletpassphrase', passphrase, timeout, retry)
        }
      })
    },

    set:function(k, v) {
        var type = typeof(k);

        if (typeof(k) === 'object') {
            for (var key in k) {
                this.set(key, k[key]);
            };
            return;
        };

        var opts = this.opts;
        var k = k.toLowerCase();

        if (opts.hasOwnProperty(k)) {
            opts[k] = v
           if (/^(user|pass)$/.test(k)) {
                this.auth(opts.user, opts.pass)
             }else if (k === 'host') {
                opts.headers['Host'] = v
            }else if (k === 'passphrasecallback' ||
                      k === 'https' ||
                      k === 'ca') {
                opts[k] = v
            }
        }

        return this;
    },

    get:function(k) {
        //Special case for booleans
        if(this.opts[k] === false){
          return false;
        }else {
          if(this.opts[k] !== false){
            var opt = this.opts[k.toLowerCase()]
          }
          return  opt; //new Error('No such option "'+k+'" exists');
        }
    },

    errors: errors

}

api.commands.forEach(function(command) {
    var cp  = Client.prototype;
    var tlc = [command.toLowerCase()];

    cp[command] = cp[tlc] = function() {
        cp.send.apply(this, tlc.concat(([]).slice.call(arguments)));
    };
})

module.exports = function(options) {
    return new Client(options)
}