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【
Js
】
仿Redis用来作前端浏览器的数据存储结构
作者:
Grace
/ 发布于
2016/7/18
/
793
用js写了一个类似redis存储结构的类库,目前只有的存储类型只有hash、set两个,还没测试过性能,欢迎各位猿友能够帮我指出程序代码的缺陷,后期有时间会完善其他几个类型的存储结构
/************************************************************************** * 类名: CRedis * 描述: Redis数据库的JS版本 * 版本: 2.0 * 作者: 老狼 * 创建日期: 2016-07-13 * 更新日期: 2016-07-13 **************************************************************************/ var C_REDIS_TYPE_NONE = 0; var C_REDIS_TYPE_STRING = 1; var C_REDIS_TYPE_LIST = 2; var C_REDIS_TYPE_SET = 3; var C_REDIS_TYPE_SORTEDSET = 4; var C_REDIS_TYPE_HASH = 5; var C_REDIS_TYPE_UNKNOW = 6; var C_RESULT_NOTEXISTS = 0; var C_RESULT_EXISTS = 1; function CRedis() { this.redis = {}; this.redis.count = 0; this.redis.db = []; }; CRedis.prototype.HashDelete = function (key, hashFields) { if (this._isNullByParams(key, hashFields) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; var n = this.redis.db[key].length; if ('[object String]' === Object.prototype.toString.call(hashFields)) { if (C_RESULT_NOTEXISTS == this.HashExists(key, hashFields)) return 0; delete this.redis.db[key].dt[hashFields]; --this.redis.db[key].length; } else if ('[object Array]' === Object.prototype.toString.call(hashFields)) { for (var i = 0; i < hashFields.length; ++i) { if (this._isNullByParams(hashFields[i]) || C_RESULT_NOTEXISTS == this.HashExists(key, hashFields[i])) continue; delete this.redis.db[key].dt[hashFields[i]]; --this.redis.db[key].length; } } else { return -1; } if (0 == this.redis.db[key].length) --this.redis.count; return n - this.redis.db[key].length; }; CRedis.prototype.HashExists = function (key, hashField) { if (this._isNullByParams(key, hashField) || this._isNonStringByParams(key, hashField)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; return (undefined === this.redis.db[key].dt[hashField] || 0 == this.redis.db[key].length) ? C_RESULT_NOTEXISTS : C_RESULT_EXISTS; }; CRedis.prototype.HashGet = function (key, hashField) { if (this._isNullByParams(key, hashField) || this._isNonStringByParams(key, hashField)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; return C_RESULT_EXISTS == this.HashExists(key, hashField) ? this.redis.db[key].dt[hashField] : undefined; }; CRedis.prototype.HashGetAll = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; return this.redis.db[key].dt; }; CRedis.prototype.HashKeys = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; var a = []; for (var k in this.redis.db[key].dt) a.push(k); return a; }; CRedis.prototype.HashLength = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; return this.redis.db[key].length; }; CRedis.prototype.HashSet = function (key, hashField, hashValue) { if (this._isNullByParams(key, hashField, hashValue) || this._isNonStringByParams(key, hashField)) return -1; if (C_RESULT_EXISTS == this.KeyExists(key) && C_REDIS_TYPE_HASH != this.KeyType(key)) return null; var a = { "type": C_REDIS_TYPE_HASH, "length": 0, "dt": [] }; if (C_RESULT_EXISTS == this.KeyExists(key)) a = this.redis.db[key]; else ++this.redis.count; if (C_RESULT_NOTEXISTS == this.KeyExists(key) || C_RESULT_NOTEXISTS == this.HashExists(key, hashField)) ++a.length; a.dt[hashField] = hashValue; this.redis.db[key] = a; return 200; }; CRedis.prototype.HashValues = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_HASH != this.KeyType(key)) return null; var a = []; for (var k in this.redis.db[key].dt) a.push(this.redis.db[key].dt[k]); return a; }; CRedis.prototype.KeyDelete = function (keys) { if (this._isNullByParams(keys)) return -1; var n = this.redis.count; if ('[object String]' === Object.prototype.toString.call(keys)) { if (C_RESULT_NOTEXISTS == this.KeyExists(keys)) return 0; delete this.redis.db[keys]; --this.redis.count; } else if ('[object Array]' === Object.prototype.toString.call(keys)) { for (var i = 0; i < keys.length; ++i) { if (this._isNullByParams(keys[i]) || C_RESULT_NOTEXISTS == this.KeyExists(keys[i])) continue; delete this.redis.db[keys[i]]; --this.redis.count; } } else { return -1; } return n - this.redis.count; }; CRedis.prototype.KeyExists = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; return (0 == this.redis.count || undefined === this.redis.db[key] || 0 == this.redis.db[key].length) ? C_RESULT_NOTEXISTS : C_RESULT_EXISTS; }; CRedis.prototype.KeyType = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; return (C_RESULT_NOTEXISTS == this.KeyExists(key) || null == this.redis.db[key].type || undefined == this.redis.db[key].type) ? C_REDIS_TYPE_NONE : this.redis.db[key].type; }; CRedis.prototype.SetAdd = function (key, value) { if (this._isNullByParams(key, value) || this._isNonStringByParams(key)) return -1; if (C_RESULT_EXISTS == this.KeyExists(key) && C_REDIS_TYPE_SET != this.KeyType(key)) return null; if (C_RESULT_EXISTS == this.SetContains(key, value)) return C_RESULT_EXISTS; var a = { "type": C_REDIS_TYPE_SET, "length": 0, "key": [], "dt": [] }; if (C_RESULT_EXISTS == this.KeyExists(key)) a = this.redis.db[key]; else ++this.redis.count; a.key[JSON.stringify(value)] = null; a.dt.push(value); ++a.length; this.redis.db[key] = a; return 200; }; CRedis.prototype.SetContains = function (key, value) { if (this._isNullByParams(key, value) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; return undefined === this.redis.db[key].key[JSON.stringify(value)] ? C_RESULT_NOTEXISTS : C_RESULT_EXISTS; }; CRedis.prototype.SetLength = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; return this.redis.db[key].length; }; CRedis.prototype.SetPop = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; var r = this.redis.db[key].dt[this.redis.db[key].length - 1]; delete this.redis.db[key].key[r]; this.redis.db[key].dt = this.redis.db[key].dt.filter(function (item, i) { return i !== this.redis.db[key].length - 1; }, this); --this.redis.db[key].length; if (0 == this.redis.db[key].length) --this.redis.count; return r; }; CRedis.prototype.SetRemove = function (key, values) { if (this._isNullByParams(key, values) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; var n = this.redis.db[key].length; if ('[object String]' === Object.prototype.toString.call(values) || '[object Object]' === Object.prototype.toString.call(values)) { if (C_RESULT_NOTEXISTS == this.SetContains(key, values)) return 0; var jsonValue = JSON.stringify(values); this.redis.db[key].dt = this.redis.db[key].dt.filter(function (item) { return JSON.stringify(item) !== jsonValue; }); delete this.redis.db[key].key[jsonValue]; --this.redis.db[key].length; } else if ('[object Array]' === Object.prototype.toString.call(values)) { for (var i = 0; i < values.length; ++i) { if (this._isNullByParams(values[i]) || C_RESULT_NOTEXISTS == this.SetContains(key, values[i])) continue; var jsonValue = JSON.stringify(values[i]); this.redis.db[key].dt = this.redis.db[key].dt.filter(function (item) { return JSON.stringify(item) !== jsonValue; }); delete this.redis.db[key].key[jsonValue]; --this.redis.db[key].length; } } else { return -1; } if (0 == this.redis.db[key].length) --this.redis.count; return n - this.redis.db[key].length; }; CRedis.prototype.SetScan = function (key) { if (this._isNullByParams(key) || this._isNonStringByParams(key)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; return this.redis.db[key].dt; }; CRedis.prototype.SetGetRange = function (key, beg, end) { if (this._isNullByParams(key, beg, end) || this._isNonStringByParams(key) || this._isNonNumberByParams(beg, end)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; if (0 > beg || end < beg || end >= this.redis.db[key].length) return undefined; var a = []; for (var i = beg; i <= end; ++i) { if (this.redis.db[key].length <= i) break; a.push(this.redis.db[key].dt[i]); } return a; }; CRedis.prototype.SetGetValue = function (key, index) { if (this._isNullByParams(key, index) || this._isNonStringByParams(key) || this._isNonNumberByParams(index)) return -1; if (C_RESULT_NOTEXISTS == this.KeyExists(key)) return undefined; if (C_REDIS_TYPE_SET != this.KeyType(key)) return null; if (0 > index || index >= this.redis.db[key].length) return undefined; return this.redis.db[key].dt[index]; }; CRedis.prototype._isNullByParams = function () { return Array.prototype.slice.call(arguments).some(function (item) { return undefined === item || null === item; }); }; CRedis.prototype._isNonStringByParams = function () { return Array.prototype.slice.call(arguments).some(function (item) { return '[object String]' !== Object.prototype.toString.call(item); }); }; CRedis.prototype._isNonNumberByParams = function () { return Array.prototype.slice.call(arguments).some(function (item) { return '[object Number]' !== Object.prototype.toString.call(item); }); };
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Grace
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