87 lines
1.9 KiB
JavaScript
87 lines
1.9 KiB
JavaScript
'use strict';
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var bitcore = require('bitcore-lib');
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var BufferUtil = bitcore.util.buffer;
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var MAX_SAFE_INTEGER = 0x1fffffffffffff; // 2 ^ 53 - 1
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var utils = {};
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utils.isHash = function(value) {
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return typeof value === 'string' && value.length === 64 && /^[0-9a-fA-F]+$/.test(value);
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};
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utils.isSafeNatural = function(value) {
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return typeof value === 'number' &&
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isFinite(value) &&
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Math.floor(value) === value &&
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value >= 0 &&
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value <= MAX_SAFE_INTEGER;
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};
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utils.startAtZero = function(obj, key) {
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if (!obj.hasOwnProperty(key)) {
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obj[key] = 0;
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}
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};
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utils.isAbsolutePath = require('path').isAbsolute;
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if (!utils.isAbsolutePath) {
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utils.isAbsolutePath = require('path-is-absolute');
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}
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utils.parseParamsWithJSON = function(paramsArg) {
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var params = paramsArg.map(function(paramArg) {
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var param;
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try {
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param = JSON.parse(paramArg);
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} catch(err) {
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param = paramArg;
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}
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return param;
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});
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return params;
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};
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/*
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* input: arguments passed into originating function (whoever called us)
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* output: bool args are valid for encoding a key to the database
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*/
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utils.hasRequiredArgsForEncoding = function(args) {
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function exists(arg) {
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return !(arg === null || arg === undefined);
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}
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if (!exists(args[0])) {
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return false;
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}
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var pastArgMissing;
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for(var i = 1; i < args.length; i++) {
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var argMissing = exists(args[i]);
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if (argMissing && pastArgMissing) {
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return false;
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}
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pastArgMissing = argMissing;
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}
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return true;
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};
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utils.getTerminalKey = function(startKey) {
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var endKey = Buffer.from(startKey);
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endKey.writeUInt8(startKey.readUInt8(startKey.length - 1) + 1, startKey.length - 1);
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return endKey;
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};
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utils.diffTime = function(time) {
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var diff = process.hrtime(time);
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return (diff[0] * 1E9 + diff[1])/(1E9 * 1.0);
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};
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utils.reverseBufferToString = function(buf) {
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return BufferUtil.reverse(buf).toString('hex');
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};
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module.exports = utils;
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