------------7月3日------------
1 /* The redisOp structure defines a Redis Operation, that is an instance of 2 * a command with an argument vector, database ID, propagation target 3 * (REDIS_PROPAGATE_*), and command pointer. 4 * 5 * Currently only used to additionally propagate more commands to AOF/Replication 6 * after the propagation of the executed command. */ 7 typedef struct redisOp { 8 robj **argv; 9 int argc, dbid, target; 10 struct redisCommand *cmd; 11 } redisOp;
argc 参数个数，argv参数数组，跟main函数里的参数一样
dbid，数据库id，target（propagation传播），暂时不懂。
cmd操作命令。
------------7月4日--------------------
1 struct redisCommand { 2 char *name; 3 redisCommandProc *proc; 4 int arity; 5 char *sflags; /* Flags as string representation, one char per flag. */ 6 int flags; /* The actual flags, obtained from the 'sflags' field. */ 7 /* Use a function to determine keys arguments in a command line. 8 * Used for Redis Cluster redirect. */ 9 redisGetKeysProc *getkeys_proc; 10 /* What keys should be loaded in background when calling this command? */ 11 int firstkey; /* The first argument that's a key (0 = no keys) */ 12 int lastkey; /* The last argument that's a key */ 13 int keystep; /* The step between first and last key */ 14 long long microseconds, calls; 15 };
给两三个例子就能懂一点，自己看代码
1 void getCommand(redisClient *c); 2 void lsetCommand(redisClient *c); 3 void saddCommand(redisClient *c); 4 5 {"get",getCommand,2,"r",0,NULL,1,1,1,0,0}, 6 {"lset",lsetCommand,4,"wm",0,NULL,1,1,1,0,0}, 7 {"sadd",saddCommand,-3,"wm",0,NULL,1,1,1,0,0} 8 9 /* Our command table. 10 * 11 * Every entry is composed of the following fields: 12 * 13 * name: a string representing the command name. 14 * function: pointer to the C function implementing the command. 15 * arity: number of arguments, it is possible to use -N to say >= N 16 * sflags: command flags as string. See below for a table of flags. 17 * flags: flags as bitmask. Computed by Redis using the 'sflags' field. 18 * get_keys_proc: an optional function to get key arguments from a command. 19 * This is only used when the following three fields are not 20 * enough to specify what arguments are keys. 21 * first_key_index: first argument that is a key 22 * last_key_index: last argument that is a key 23 * key_step: step to get all the keys from first to last argument. For instance 24 * in MSET the step is two since arguments are key,val,key,val,... 25 * microseconds: microseconds of total execution time for this command. 26 * calls: total number of calls of this command. 27 * 28 * The flags, microseconds and calls fields are computed by Redis and should 29 * always be set to zero. 30 * 31 * Command flags are expressed using strings where every character represents 32 * a flag. Later the populateCommandTable() function will take care of 33 * populating the real 'flags' field using this characters. 34 * 35 * This is the meaning of the flags: 36 * 37 * w: write command (may modify the key space). 38 * r: read command (will never modify the key space). 39 * m: may increase memory usage once called. Don't allow if out of memory. 40 * a: admin command, like SAVE or SHUTDOWN. 41 * p: Pub/Sub related command. 42 * f: force replication of this command, regardless of server.dirty. 43 * s: command not allowed in scripts. 44 * R: random command. Command is not deterministic, that is, the same command 45 * with the same arguments, with the same key space, may have different 46 * results. For instance SPOP and RANDOMKEY are two random commands. 47 * S: Sort command output array if called from script, so that the output 48 * is deterministic. 49 * l: Allow command while loading the database. 50 * t: Allow command while a slave has stale data but is not allowed to 51 * server this data. Normally no command is accepted in this condition 52 * but just a few. 53 * M: Do not automatically propagate the command on MONITOR. 54 * k: Perform an implicit ASKING for this command, so the command will be 55 * accepted in cluster mode if the slot is marked as 'importing'. 56 */
很明显，redisCommandProc是个函数指针，
typedef void redisCommandProc(redisClient *c);
--------------7月5日----------------------
还是说上面的命令吧
{"get",getCommand,2,"r",0,NULL,1,1,1,0,0},
命令名字叫get，具体实现在getCommand里面，参数有两个（包括get?get name），模式为只读（will never modify the key space）。
{"lset",lsetCommand,4,"wm",0,NULL,1,1,1,0,0},
命令名字叫lset，具体实现在lsetCommand函数，参数有4个（lset mylist 3 “juan”），模式为写，会使用内存（may increase memory usage once called. Don't allow if out of memory）。
-----------------7月10日----------------------
redisServer里有个aeEventLoop，牵涉到Redis的事件。
Redis事件分两种：
-
处理文件事件：在多个客户端中实现多路复用，接受它们发来的命令请求，并将命令的执行结果返回给客户端。
-
时间事件：实现服务器常规操作。
1 /* Types and data structures */ 2 typedef void aeFileProc(struct aeEventLoop *eventLoop, int fd, void *clientData, int mask); 3 typedef int aeTimeProc(struct aeEventLoop *eventLoop, long long id, void *clientData); 4 typedef void aeEventFinalizerProc(struct aeEventLoop *eventLoop, void *clientData); 5 6 /* File event structure */ 7 typedef struct aeFileEvent { 8 int mask; /* one of AE_(READABLE|WRITABLE) */ 9 aeFileProc *rfileProc; 10 aeFileProc *wfileProc; 11 void *clientData; 12 } aeFileEvent; 13 14 /* Time event structure */ 15 typedef struct aeTimeEvent { 16 long long id; /* time event identifier. */ 17 long when_sec; /* seconds */ 18 long when_ms; /* milliseconds */ 19 aeTimeProc *timeProc; 20 aeEventFinalizerProc *finalizerProc; 21 void *clientData; 22 struct aeTimeEvent *next; 23 } aeTimeEvent;