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shovelnose.js
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shovelnose.js
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/* shovelnose.js - pass item(s) to amazon */
var Nm = require('nightmare'),
//-------------
_ = require('underscore'),
Q = require('q'),
//-------------
Loach = require('./loach.js'),
loach = new Loach(),
//-------------
common = require('./common.js'),
dbg = new common.Debug('shovelnose.js'),
//-------------
first = true, items, pnmq = Q.defer(); // function specific variables
var Search = function(multi, arr, lastidx) {
this.first = true;
this.searchq = Q.defer();
this.nm = new Nm({ loadImages : false });
if (multi) {
this.multi = multi;
this.arr = arr;
this.arridx = 0;
this.last = lastidx;
}
};
Search.prototype.instance = function(item) {
dbg.freg = 'search';
var t = this;
if (item !== undefined) {
t.nm
.useragent('Mozilla/5.0 (X11; Linux x86_64; rv:37.0) Gecko/20100101 Firefox/37.0') // ensure no mobile page
.goto('http://www.amazon.com')
.type('input[id="twotabsearchtextbox"]', item.name)
.click('input[value="Go"]')
.wait('#atfResults')
.evaluate(function(item, t) {
if (document.querySelector('#noResultsTitle')) // item not found
return null;
/* get first result */
var pr = document.querySelector('#s-results-list-atf').childNodes[0],
asin;
if (pr.textContent.trimLeft().substr(0,(26 + item.name.length))
=== 'Video shorts related to "' + item.name + '"')
pr = pr.parentNode.childNodes[1]; // first result was video container, skip it
return asin = pr.getAttribute('data-asin') || '';
}, function(ret) {
if (ret) {
dbg.log('search for item: `' + item.name + '\' successful');
return item.asin = ret;
}
dbg.log('search for item: `' + item.name + '\' unsuccessful');
return items[t.tmpidx = items.indexOf(item)] = null;
}, item)
.run(function(err, nm) {
if (err) {
dbg.log(err);
throw err;
}
if (item.asin) {
/* search was successful, continue to individual page */
nm
.useragent('Mozilla/5.0 (X11; Linux x86_64; rv:37.0) Gecko/20100101 Firefox/37.0') // ensure no mobile page
.goto('http://www.amazon.com/dp/' + item.asin)
.wait('#productTitle')
.evaluate(function(item, t) {
var retobj = {},
new_prod_format = false;
var name = document.querySelector('#productTitle')
|| document.querySelector('#btAsinTitle')
|| null;
if (name)
retobj.AMZname = name.textContent;
else
return 'failed at name query';
var price = document.querySelector('#priceblock_ourprice') // regular format
|| document.querySelector('#priceblock_saleprice') // sale
|| document.querySelector('#actualPriceValue') // large price
|| null;
if (price) {
price = parseFloat(price.textContent.replace('$', ''));
item.price = parseFloat(item.price.toLocaleString().replace('$',''));
retobj.AMZprice = price;
} else {
return 'failed at price query';
}
if ((price / item.price) >= 3) { // good, get rest of info
var details = document.querySelector('#detail-bullets'),
rankquery;
if (!details) {
details = document.querySelector('#prodDetails'); // new product format
if (!details) return 'failed at detail query';
new_prod_format = true;
}
if (rankquery = details.querySelector('#SalesRank')) {
var rank = /(#\d+).*(\s.*)in.*/.exec(rankquery.textContent)[0].replace(/\s*\(.*\)/, ''); // get rid of `(See Top 100 in ...)'
if (rank)
retobj.AMZrank = rank;
else
return 'failed at rank regexp';
} else {
return '2failed at sales rank query';
}
var rankranking = parseInt(/#(\d+,?)+/.exec(rank)[0].replace(/[#,]/g,''));
if (rankranking) {
if (rankranking < 50000) {
retobj.AMZrankIs = 'ideal';
} else if (rankranking < 100000) {
retobj.AMZrankIs = 'good';
} else if (rankranking < 200000) {
retobj.AMZrankIs = 'fair';
} else {
return 'toss'; // toss it
}
} else {
return 'failed at rankranking regexp';
}
} else {
return 'failed at price division';
}
if (new_prod_format) {
var key;
if (!(key = details.getElementsByClassName('label')))
return 'failed to get labels';
retobj.AMZdimensions = '';
for (var i = 0; i < key.length; i++) {
switch (key[i].textContent) {
case "Product Dimensions" :
retobj.AMZdimensions = key[i].parentNode.querySelector('td.value').textContent;
break;
case "UPC" :
retobj.AMZupc = key[i].parentNode.querySelector('td.value').textContent;
break;
case "Shipping Weight" :
var val = key[i].parentNode.querySelector('td.value').textContent;
val = ' ' + key[i].textContent + ' ' + val.replace(/\(.*\)/, '').trimRight();
retobj.AMZdimensions += val;
break;
}
}
if (!retobj.AMZdimensions)
return 'failed to get dimensions in product table';
return retobj;
}
var dim = details.getElementsByTagName('li');
if (dim)
for (var i = 0; i < dim.length; i++) {
if (dim[i].textContent.match('Product Dimensions:')) {
retobj.AMZdimensions = /\d.+/.exec(dim[i].textContent)[0]
return retobj;
} else if (dim[i].textContent.match('Shipping Weight')) {
retobj.AMZdimensions += /^.*\d+ \w+/.exec(dim[i].textContent)[0];
return retobj;
}
}
return 'failed at end';
}, function(fate) {
if (fate) {
if (fate === 'toss') {
return item = items[t.tmpidx = items.indexOf(item)] = null;
} else if (typeof fate === 'string') {
/* XXX is there a cleaner way to do this? */
var lore = fate === 'failed at price division' ? 'log' : 'error',
level = lore === 'error' ? (Number(fate[0]) || 3) // may not specify level 3 in str
: ''
dbg[lore]('`' + item.name + "'" + ' nightmare .eval() ' +
((Number(level) && level !== 3) ? fate.substr(1) : fate) , level);
return item = items[t.tmpidx = items.indexOf(item)] = null;
}
detkeys = Object.keys(fate);
for (var i = 0; i < detkeys.length; i++)
item[detkeys[i]] = fate[detkeys[i]];
return fate;
}
dbg.error('failed to get info of item `' + item.name + "'");
return item = items[t.tmpidx = items.indexOf(item)] = null;
}, item)
.run(function(err) {
if (err)
throw err;
if (item) {
dbg.log('successfully processed item: `' + item.name + "'");
t.tmpidx = items.indexOf(item);
}
/* find subsequent items recursively */
if (t.multi) {
var next = process_next_multi(null, null, t.tmpidx,
t.arridx === t.last,
items.indexOf(t.arr[t.arridx+1]));
if (next) {
++t.arridx;
return t.instance(next);
}
return t.searchq.resolve();
}
var next = process_next(null, t.tmpidx);
if (next)
return t.instance(next);
return t.searchq.resolve(JSON.stringify(items));
});
return;
}
/* add recursion outside of if blk in case last item's search is unsuccessful */
if (t.multi) {
var next = process_next_multi(null, null, t.tmpidx,
t.arridx === t.last,
items.indexOf(t.arr[t.arridx+1]));
if (next) {
++t.arridx;
return t.instance(next);
}
return t.searchq.resolve();
}
var next = process_next(null, t.tmpidx);
if (next)
return t.instance(next);
return t.searchq.resolve(JSON.stringify(items));
});
if (this.first) {
this.first = !this.first;
return this.searchq.promise;
} else {
return;
}
} else {
dbg.error('fell through, something went wrong', 4); // shouldn't get here
return this.searchq.resolve(null);
}
};
function process_next(init, idx)
{
if (init) {
if (!init.length) {
dbg.error('loach returned NULL', 4);
return null;
}
var promises = [];
items = init,
promises.push(new Search(false, null).instance(items[0]));
return Q.all(promises);
}
if (!items[idx]) {
items.splice(idx, 1);
return items[idx] ? items[idx] : null;
}
return items[++idx] ? items[idx] : null;
}
function process_next_multi(num, init, idx, islast, nextidx)
{
if (init) {
if (!init.length) {
dbg.error('loach returned NULL', 4);
return null;
}
if (num > init.length) {
console.error('too many instances requested!');
return null;
}
var promises = [];
items = init;
for (var i = 0; i < num; i++)
this['nmarr' + i] = [];
for (i = 0; i < init.length; i += num)
for (var j = 0; j < num; j++)
if (i+j < init.length)
this['nmarr' + j].push(init[i+j]);
for (i = 0; i < num; i++)
promises.push((new Search(true, this['nmarr' + i], this['nmarr' + i].length-1))
.instance(this['nmarr' + i][0]));
promises.push(pnmq.promise);
return Q.all(promises);
}
return !islast ? items[nextidx]
: items[++idx] !== undefined ? null
: function() {
pnmq.resolve();
return null;
}();
}
function getResults(num)
{
if (num > 1) {
return loach.getResults()
.then(function(results) {
var res = _.flatten(results);
return process_next_multi(num, res).then(function() {
var i = 0, itemslen = items.length;
while (i < itemslen) {
if (!items[i]) {
items.splice(i, 1);
--itemslen;
continue;
}
++i;
}
return JSON.stringify(items);
});
});
}
return loach.getResults()
.then(function(results) {
var res = _.flatten(results);
return process_next(res);
});
}
module.exports = function() {
return { getResults : getResults };
};