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index.js
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index.js
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var fs = require('fs');
module.exports = {
free: free,
total: total,
freePercent: freePercent,
usedPercent: usedPercent,
allStats: allStats,
raw: raw,
};
/* PUBLIC */
function free(units) {
var meminfo = _parseProcMeminfo();
return _free(meminfo, units);
}
function total(units) {
var meminfo = _parseProcMeminfo();
return _total(meminfo, units);
}
function freePercent() {
var meminfo = _parseProcMeminfo();
return _freePercent(meminfo);
}
function usedPercent() {
var meminfo = _parseProcMeminfo();
return _usedPercent(meminfo);
}
function allStats(units) {
units = units || 'bytes';
var meminfo = _parseProcMeminfo();
return {
free: _free(meminfo, units),
total: _total(meminfo, units),
freePercent: _freePercent(meminfo),
usedPercent: _usedPercent(meminfo),
};
}
//raw `/proc/meminfo` as object
function raw(cb) {
return _parseProcMeminfo(cb);
}
/* PRIVATE */
function _free(meminfo, units) {
units = units || 'bytes';
var freeMem = meminfo.memFree;
var cached = meminfo.cached;
var buffers = meminfo.buffers;
var totalFreeMem = freeMem + cached + buffers;
var totalFreeMemBytes = totalFreeMem * 1024;
var converted = _bytesTo(totalFreeMemBytes, units);
return converted;
}
function _total(meminfo, units) {
units = units || 'bytes';
var memTotal = meminfo.memTotal;
var memTotalBytes = memTotal * 1024;
var converted = _bytesTo(memTotalBytes, units);
return converted;
}
function _freePercent(meminfo) {
var freeMem = meminfo.memFree;
var cached = meminfo.cached;
var buffers = meminfo.buffers;
var memTotal = meminfo.memTotal;
var totalFreeMem = freeMem + cached + buffers;
var percent = ((totalFreeMem / memTotal) * 100);
return percent;
}
function _usedPercent(meminfo) {
var freeMem = meminfo.memFree;
var cached = meminfo.cached;
var buffers = meminfo.buffers;
var memTotal = meminfo.memTotal;
var totalFreeMem = freeMem + cached + buffers;
var used = memTotal - totalFreeMem;
var percent = ((used / memTotal) * 100);
return percent;
}
//NOTE: docs at `man proc`
function _parseProcMeminfo(cb) {
if (cb && typeof cb === 'function') {
return fs.readFile('/proc/meminfo', function(err, meminfo) {
if (err) {
return cb(err);
}
return cb(null, _formatParsedProcMeminfo(meminfo));
});
}
var meminfo = fs.readFileSync('/proc/meminfo');
return _formatParsedProcMeminfo(meminfo);
}
function _formatParsedProcMeminfo(meminfo) {
var lines = meminfo.toString().split('\n');
//remove last blank line
lines.pop();
var data = {};
lines.forEach(function(line) {
var row = line.split(':');
data[_toCamelCase(row[0])] = parseInt(row[1].trim().split(' ')[0]);
});
return data;
}
//quick dirty to handle parens and underscores
function _toCamelCase(str) {
var newString = '';
var insideParens = false;
newString += str[0].toLowerCase();
for (var i = 1; i < str.length; i++) {
var char = str[i];
switch (char) {
case ')':
case '_':
break;
case '(':
insideParens = true;
break;
default:
if (insideParens) {
insideParens = false;
newString += char.toUpperCase();
} else {
newString += char;
}
break;
}
}
return newString;
}
function _bytesTo(bytes, units) {
var KiB = 1024;
var MiB = 1024 * KiB;
var GiB = 1024 * MiB;
switch (units) {
case 'bytes':
break;
case 'KiB':
bytes /= KiB;
break;
case 'MiB':
bytes /= MiB;
break;
case 'GiB':
bytes /= GiB;
break;
default:
var errMsg =
'[mem-stats] Error: Unknown units "' + units + '", use one of: ' +
'"bytes" (default), "KiB", "MiB" or "GiB"';
console.log(errMsg);
}
//NOTE: the variable named `bytes` may not actually contain a number
//representing the number of bytes. its done this way to only have to use one
//variable.
return bytes;
}