Function migrateCommand

app/redis-6.2.6/src/cluster.c:5332–5671

MIGRATE host port key dbid timeout [COPY | REPLACE | AUTH password | * AUTH2 username password] * * On in the multiple keys form: * * MIGRATE host port "" dbid timeout [COPY | REPLACE | AUTH password | * AUTH2 username password] KEYS key1 key2 ... keyN */

 * MIGRATE host port "" dbid timeout [COPY | REPLACE | AUTH password |
 *         AUTH2 username password] KEYS key1 key2 ... keyN */
void migrateCommand(client *c) {
    migrateCachedSocket *cs;
    int copy = 0, replace = 0, j;
    char *username = NULL;
    char *password = NULL;
    long timeout;
    long dbid;
    robj **ov = NULL; /* Objects to migrate. */
    robj **kv = NULL; /* Key names. */
    robj **newargv = NULL; /* Used to rewrite the command as DEL ... keys ... */
    rio cmd, payload;
    int may_retry = 1;
    int write_error = 0;
    int argv_rewritten = 0;

    /* To support the KEYS option we need the following additional state. */
    int first_key = 3; /* Argument index of the first key. */
    int num_keys = 1;  /* By default only migrate the 'key' argument. */

    /* Parse additional options */
    for (j = 6; j < c->argc; j++) {
        int moreargs = (c->argc-1) - j;
        if (!strcasecmp(c->argv[j]->ptr,"copy")) {
            copy = 1;
        } else if (!strcasecmp(c->argv[j]->ptr,"replace")) {
            replace = 1;
        } else if (!strcasecmp(c->argv[j]->ptr,"auth")) {
            if (!moreargs) {
                addReplyErrorObject(c,shared.syntaxerr);
                return;
            }
            j++;
            password = c->argv[j]->ptr;
            redactClientCommandArgument(c,j);
        } else if (!strcasecmp(c->argv[j]->ptr,"auth2")) {
            if (moreargs < 2) {
                addReplyErrorObject(c,shared.syntaxerr);
                return;
            }
            username = c->argv[++j]->ptr;
            redactClientCommandArgument(c,j);
            password = c->argv[++j]->ptr;
            redactClientCommandArgument(c,j);
        } else if (!strcasecmp(c->argv[j]->ptr,"keys")) {
            if (sdslen(c->argv[3]->ptr) != 0) {
                addReplyError(c,
                    "When using MIGRATE KEYS option, the key argument"
                    " must be set to the empty string");
                return;
            }
            first_key = j+1;
            num_keys = c->argc - j - 1;
            break; /* All the remaining args are keys. */
        } else {
            addReplyErrorObject(c,shared.syntaxerr);
            return;
        }
    }