仿Redis用来作前端浏览器的数据存储结构代码,Js代码库,德仔网

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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/ 566
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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