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407 lines
14 KiB
C++
407 lines
14 KiB
C++
#pragma once
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#include "../acl_cpp_define.hpp"
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#include <vector>
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#include "../stdlib/string.hpp"
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#include "redis_command.hpp"
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namespace acl {
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class redis_client;
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class redis_client_cluster;
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// redis 服务支持的数据类型分类
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// the data type supported by redis
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typedef enum
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{
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REDIS_KEY_NONE, // none
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REDIS_KEY_STRING, // string
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REDIS_KEY_HASH, // hash
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REDIS_KEY_LIST, // list
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REDIS_KEY_SET, // set
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REDIS_KEY_ZSET // sorted set
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} redis_key_t;
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class ACL_CPP_API redis_key : virtual public redis_command
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{
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public:
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/**
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* see redis_command::redis_command()
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*/
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redis_key(void);
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/**
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* see redis_command::redis_command(redis_client*)
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*/
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redis_key(redis_client* conn);
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/**
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* see redis_command::redis_command(redis_client_cluster*, size_t)
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*/
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redis_key(redis_client_cluster* cluster, size_t max_conns = 0);
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virtual ~redis_key(void);
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/**
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* 删除一个或一组 KEY，对于变参的接口，则要求最后一个参数必须以 NULL 结束
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* delete one or some keys from redis, for deleting a variable
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* number of keys, the last key must be NULL indicating the end
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* of the variable args
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* @return {int} 返回所删除的 KEY 的个数，如下：
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* 0: 未删除任何 KEY
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* -1: 出错
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* >0: 真正删除的 KEY 的个数，该值有可能少于输入的 KEY 的个数
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* return the number of keys been deleted, return value as below:
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* 0: none key be deleted
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* -1: error happened
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* >0: the number of keys been deleted
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*
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*/
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int del_one(const char* key);
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int del_one(const char* key, size_t len);
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int del(const char* key);
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int del(const std::vector<string>& keys);
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int del(const std::vector<const char*>& keys);
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int del(const char* keys[], size_t argc);
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int del(const char* keys[], const size_t lens[], size_t argc);
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int del_keys(const char* first_key, ...);
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int del_keys(const std::vector<string>& keys);
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int del_keys(const std::vector<const char*>& keys);
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int del_keys(const char* keys[], size_t argc);
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int del_keys(const char* keys[], const size_t lens[], size_t argc);
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/**
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* 序列化给定 key ，并返回被序列化的值，使用 RESTORE 命令可以将这个值反序列化
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* 为 Redis 键
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* serialize the object associate with the given key, and get the
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* value after serializing, RESTORE command can be used to
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* deserialize by the value
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* @param key {const char*} 键值
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* the key
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* @param out {string&} 存储序列化的二进制数据
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* buffur used to store the result
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* @return {int} 序列化后数据长度
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* the length of the data after serializing
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*/
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int dump(const char* key, string& out);
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/**
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* 判断 KEY 是否存在
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* check if the key exists in redis
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* @param key {const char*} KEY 值
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* the key
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* @return {bool} 返回 true 表示存在，否则表示出错或不存在
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* true returned if key existing, false if error or not existing
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*/
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bool exists(const char* key);
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/**
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* 设置 KEY 的生存周期，单位（秒）
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* set a key's time to live in seconds
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* @param key {const char*} 键值
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* the key
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* @param n {int} 生存周期（秒）
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* lief cycle in seconds
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* @return {int} 返回值含义如下：
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* return value as below:
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* > 0: 成功设置了生存周期
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* set successfully
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* 0：该 key 不存在
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* the key doesn't exist
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* < 0: 出错
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* error happened
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*/
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int expire(const char* key, int n);
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/**
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* 用 UNIX 时间截设置 KEY 的生存周期
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* set the expiration for a key as a UNIX timestamp
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* @param key {const char*} 对象键值
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* the key
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* @param stamp {time_t} UNIX 时间截，即自 1970 年以来的秒数
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* an absolute Unix timestamp (seconds since January 1, 1970).
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* @return {int} 返回值的含义：
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* return value:
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* 1: 设置成功
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* the timeout was set
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* 0: 该 key 不存在
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* the key doesn't exist or the timeout couldn't be set
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* -1: 出错
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* error happened
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*/
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int expireat(const char* key, time_t stamp);
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/**
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* 查找所有符合给定模式 pattern 的 key
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* find all keys matching the given pattern
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* @param pattern {const char*} 匹配模式
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* the give matching pattern
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* @param out {std::vector<string>*} 非 NULL 时用来存储结果集
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* store the matched keys
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* @return {int} 结果集的数量，0--为空，<0 -- 表示出错
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* return the number of the matched keys, 0 if none, < 0 if error
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* 匹配模式举例：
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* KEYS * 匹配数据库中所有 key 。
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* KEYS h?llo 匹配 hello ， hallo 和 hxllo 等。
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* KEYS h*llo 匹配 hllo 和 heeeeello 等。
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* KEYS h[ae]llo 匹配 hello 和 hallo ，但不匹配 hillo 。
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*
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* 操作成功后可以通过以下任一方式获得数据
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* 1、基类方法 get_value 获得指定下标的元素数据
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* 2、基类方法 get_child 获得指定下标的元素对象(redis_result），然后再通过
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* redis_result::argv_to_string 方法获得元素数据
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* 3、基类方法 get_result 方法取得总结果集对象 redis_result，然后再通过
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* redis_result::get_child 获得一个元素对象，然后再通过方式 2 中指定
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* 的方法获得该元素的数据
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* 4、基类方法 get_children 获得结果元素数组对象，再通过 redis_result 中
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* 的方法 argv_to_string 从每一个元素对象中获得元素数据
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* 5、在调用方法中传入非空的存储结果对象的地址
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*/
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int keys_pattern(const char* pattern, std::vector<string>* out);
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/**
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* 将数据从一个 redis-server 迁移至另一个 redis-server
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* atomically transfer a key from a redis instance to another one
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* @param key {const char*} 数据对应的键值
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* the key
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* @param addr {const char*} 目标 redis-server 服务器地址，格式：ip:port
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* the destination redis instance's address, format: ip:port
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* @param dest_db {unsigned} 目标 redis-server 服务器的数据库 ID 号
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* the databases ID in destination redis
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* @param timeout {unsigned} 迁移过程的超时时间(毫秒级)
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* timeout(microseconds) in transfering
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* @param option {const char*} COPY 或 REPLACE
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* transfer option: COPY or REPLACE
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* @return {bool} 迁移是否成功
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* if transfering successfully
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*/
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bool migrate(const char* key, const char* addr, unsigned dest_db,
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unsigned timeout, const char* option = NULL);
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/**
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* 将数据移至本 redis-server 中的另一个数据库中
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* move a key to another database
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* @param key {const char*} 数据键值
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* the key
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* @param dest_db {unsigned} 目标数据库 ID 号
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* the destination database
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* @return {int} 迁移是否成功。-1: 表示出错，0：迁移失败，因为目标数据库中存在
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* 相同键值，1：迁移成功
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* if moving succcessfully. -1 if error, 0 if moving failed because
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* the same key already exists, 1 if successful
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*/
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int move(const char* key, unsigned dest_db);
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/**
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* 返回给定 key 引用所储存的值的次数。此命令主要用于除错。
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* get the referring count of the object, which just for debugging
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* @param key {const char*} 数据键值
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* the key
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* @return {int} 返回 0 表示该 key 不存在；< 0 表示出错
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* 0 if key not exists, < 0 if error
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*/
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int object_refcount(const char* key);
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/**
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* 返回给定 key 键储存的值所使用的内部表示
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* get the internal storing of the object assosicate with the key
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* @param key {const char*} 数据键值
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* the key
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* @param out {string&} 存在结果
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* store the result
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* @return {bool} 是否成功
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* if successful
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*/
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bool object_encoding(const char* key, string& out);
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/**
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* 返回给定 key 自储存以来的空闲时间(idle， 没有被读取也没有被写入)，以秒为单位
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* get the key's idle time in seconds since its first stored
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* @param key {const char*} 数据键值
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* the key
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* @return {int} 返回值 < 0 表示出错
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* 0 if error happened
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*/
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int object_idletime(const char* key);
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/**
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* 移除给定 key 的生存时间，将这个 key 从"易失的"(带生存时间 key )转换成
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* "持久的"(一个不带生存时间、永不过期的 key )
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* remove the expiration from a key
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* @param key {const char*} 对象键值
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* the key
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* @return {int} 返回值的含义如下：
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* the value returned as below:
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* 1 -- 设置成功
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* set ok
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* 0 -- 该 key 不存在或未设置过期时间
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* the key not exists or not be set expiration
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* -1 -- 出错
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* error happened
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*/
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int persist(const char* key);
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/**
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* 设置 KEY 的生存周期，单位（毫秒）
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* set a key's time to live in milliseconds
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* @param key {const char*} 键值
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* the key
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* @param n {int} 生存周期（毫秒）
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* time to live in milliseconds
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* @return {int} 返回值含义如下：
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* value returned as below:
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* > 0: 成功设置了生存周期
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* set successfully
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* 0：该 key 不存在
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* the key doesn't exist
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* < 0: 出错
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* error happened
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*/
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int pexpire(const char* key, int n);
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/**
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* 以毫秒为单位设置 key 的过期 unix 时间戳
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* set the expiration for a key as UNIX timestamp specified
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* in milliseconds
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* @param key {const char*} 键值
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* the key
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* @param n {long long int} UNIX 时间截，即自 1970 年以来的毫秒数
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* the UNIX timestamp in milliseconds from 1970.1.1
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* @return {int} 返回值含义如下：
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* value resturned as below:
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* > 0: 成功设置了生存周期
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* set successfully
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* 0：该 key 不存在
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* the key doesn't exist
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* < 0: 出错
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* error happened
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*/
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int pexpireat(const char* key, long long int n);
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/**
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* 获得 KEY 的剩余生存周期，单位（毫秒）
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* get the time to live for a key in milliseconds
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* @param key {const char*} 键值
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* the key
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* @return {int} 返回对应键值的生存周期
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* value returned as below:
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* >0: 该 key 剩余的生存周期（毫秒）
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* the time to live for a key in milliseconds
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* -3：出错
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* error happened
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* -2：key 不存在
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* the key doesn't exist
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* -1：当 key 存在但没有设置剩余时间
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* th key were not be set expiration
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* 注：对于 redis-server 2.8 以前版本，key 不存在或存在但未设置生存期则返回 -1
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* notice: for redis version before 2.8, -1 will be returned if the
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* key doesn't exist or the key were not be set expiration.
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*/
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long long int pttl(const char* key);
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/**
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* 从当前数据库中随机返回(不会删除)一个 key
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* return a random key from the keyspace
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＊@param buf {string&} 成功获得随机 KEY 时存储结果
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* store the key
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* @return {bool} 操作是否成功，当出错或 key 不存在时返回 false
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* true on success, or false be returned
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*/
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bool randmkey(string& buf);
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/**
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* 将 key 改名为 newkey
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* rename a key
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* @return {bool}
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* true on success, or error happened
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*/
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bool rename_key(const char* key, const char* newkey);
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/**
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* 当且仅当 newkey 不存在时，将 key 改名为 newkey
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* rename a key only if the new key does not exist
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* @param key {const char*} 旧 key
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* @param newkey {const char*} 新 key
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* @return {int} 返回值 > 0: 成功，0： 目标 key 存在，< 0：失败
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* return value > 0 on success, < 0 on error, == 0 when newkey exists
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*/
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int renamenx(const char* key, const char* newkey);
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/**
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* 反序列化给定的序列化值，并将它和给定的 key 关联
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* create a key using the provided serialized value, previously
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* obtained by using DUMP
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* @param ttl {int} 以毫秒为单位为 key 设置生存时间，如果 ttl 为 0，
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* 那么不设置生存时间
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* the time to live for the key in milliseconds, if tll is 0,
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* expiration will not be set
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* @param replace {bool} 如果 key 存在是否直接覆盖
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* if the key already exists, this parameter decides if replacing
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* the existing key
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* @return {bool}
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* true on success, false on error
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*/
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bool restore(const char* key, const char* value, size_t len,
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int ttl, bool replace = false);
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/**
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* 获得 KEY 的剩余生存周期，单位（秒）
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* get the time to live for a key in seconds
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* @param key {const char*} 键值
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* the key
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* @return {int} 返回对应键值的生存周期
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* return value as below:
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* > 0: 该 key 剩余的生存周期（秒）
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* the time to live for a key in seconds
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* -3：出错
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* error happened
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* -2：key 不存在
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* the key doesn't exist
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* -1：当 key 存在但没有设置剩余时间
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* the key were not be set expiration
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* 注：对于 redis-server 2.8 以前版本，key 不存在或存在但未设置生存期则返回 -1
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* notice: for the redis version before 2.8, -1 will be returned
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* if the key doesn't exist or the key were not be set expiration
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*/
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int ttl(const char* key);
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/**
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* 获得 KEY 的存储类型
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* get the the type stored at key
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* @para key {const char*} KEY 值
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* the key
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* @return {redis_key_t} 返回 KEY 的存储类型
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* return redis_key_t defined above as REDIS_KEY_
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*/
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redis_key_t type(const char* key);
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/**
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* 命令用于迭代当前数据库中的数据库键
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* incrementally iterate the keys space in the specified database
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* @param cursor {int} 游标值，开始遍历时该值写 0
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* the iterating cursor beginning with 0
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* @param out {std::vector<acl::string>&} 存储结果集，内部以追加方式将本次
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* 遍历结果集合添加进该数组中，为防止因总结果集过大导致该数组溢出，用户可在
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* 调用本函数前后清理该数组对象
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* string array storing the results, the array will be cleared
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* internal and the string result will be appened to the array
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* @param pattern {const char*} 匹配模式，glob 风格，非空时有效
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& the matching pattern with glob style, only effective if not NULL
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* @param count {const size_t*} 限定的结果集数量，非空指针时有效
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* limit the max number of the results stored in array, only
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* effective when not NULL
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* @return {int} 下一个游标位置，含义如下：
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* return the next cursor value as follow:
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* 0：遍历结束，当遍历结束时还需要检查 out 中的结果集是否为空，如果
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* 不为空，则需要继续进行处理
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* iterating is finished and the out should be checked if emtpy
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* -1: 出错
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* some error happened
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* >0: 游标的下一个位置，即使这样，具体有多少结果还需要检查 out，因为有可能为空
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* the next cursor value for iterating
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*/
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int scan(int cursor, std::vector<string>& out,
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const char* pattern = NULL, const size_t* count = NULL);
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};
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} // namespace acl
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