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Add GET parameter to SET command (#7852)

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Add optional GET parameter to SET command in order to set a new value to
a key and retrieve the old key value. With this change we can deprecate
`GETSET` command and use only the SET command with the GET parameter.
This commit is contained in:
Nykolas Laurentino de Lima 2020-10-02 09:07:19 -03:00 committed by GitHub
parent 3945a32177
commit 66ee45b65c
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 39 additions and 5 deletions
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23
src/t_string.c
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@ -44,9 +44,9 @@ static int checkStringLength(client *c, long long size) {
/* The setGenericCommand() function implements the SET operation with different
* options and variants. This function is called in order to implement the
* following commands: SET, SETEX, PSETEX, SETNX.
* following commands: SET, SETEX, PSETEX, SETNX, GETSET.
*
* 'flags' changes the behavior of the command (NX or XX, see below).
* 'flags' changes the behavior of the command (NX, XX or GET, see below).
*
* 'expire' represents an expire to set in form of a Redis object as passed
* by the user. It is interpreted according to the specified 'unit'.
@ -64,6 +64,7 @@ static int checkStringLength(client *c, long long size) {
#define OBJ_SET_EX (1<<2) /* Set if time in seconds is given */
#define OBJ_SET_PX (1<<3) /* Set if time in ms in given */
#define OBJ_SET_KEEPTTL (1<<4) /* Set and keep the ttl */
#define OBJ_SET_GET (1<<5) /* Set if want to get key before set */
void setGenericCommand(client *c, int flags, robj *key, robj *val, robj *expire, int unit, robj *ok_reply, robj *abort_reply) {
long long milliseconds = 0; /* initialized to avoid any harmness warning */
@ -84,16 +85,23 @@ void setGenericCommand(client *c, int flags, robj *key, robj *val, robj *expire,
addReply(c, abort_reply ? abort_reply : shared.null[c->resp]);
return;
}
if (flags & OBJ_SET_GET) {
getGenericCommand(c);
}
genericSetKey(c,c->db,key,val,flags & OBJ_SET_KEEPTTL,1);
server.dirty++;
if (expire) setExpire(c,c->db,key,mstime()+milliseconds);
notifyKeyspaceEvent(NOTIFY_STRING,"set",key,c->db->id);
if (expire) notifyKeyspaceEvent(NOTIFY_GENERIC,
"expire",key,c->db->id);
addReply(c, ok_reply ? ok_reply : shared.ok);
if (!(flags & OBJ_SET_GET)) {
addReply(c, ok_reply ? ok_reply : shared.ok);
}
}
/* SET key value [NX] [XX] [KEEPTTL] [EX <seconds>] [PX <milliseconds>] */
/* SET key value [NX] [XX] [KEEPTTL] [GET] [EX <seconds>] [PX <milliseconds>] */
void setCommand(client *c) {
int j;
robj *expire = NULL;
@ -106,7 +114,7 @@ void setCommand(client *c) {
if ((a[0] == 'n' || a[0] == 'N') &&
(a[1] == 'x' || a[1] == 'X') && a[2] == '\0' &&
!(flags & OBJ_SET_XX))
!(flags & OBJ_SET_XX) && !(flags & OBJ_SET_GET))
{
flags |= OBJ_SET_NX;
} else if ((a[0] == 'x' || a[0] == 'X') &&
@ -114,6 +122,11 @@ void setCommand(client *c) {
!(flags & OBJ_SET_NX))
{
flags |= OBJ_SET_XX;
} else if ((a[0] == 'g' || a[0] == 'G') &&
(a[1] == 'e' || a[1] == 'E') &&
(a[2] == 't' || a[2] == 'T') && a[3] == '\0' &&
!(flags & OBJ_SET_NX)) {
flags |= OBJ_SET_GET;
} else if (!strcasecmp(c->argv[j]->ptr,"KEEPTTL") &&
!(flags & OBJ_SET_EX) && !(flags & OBJ_SET_PX))
{

21
tests/unit/type/string.tcl
View File

@ -394,6 +394,27 @@ start_server {tags {"string"}} {
list $v1 $v2 [r get foo]
} {{} OK 2}
test {Extended SET GET option} {
r del foo
r set foo bar
set old_value [r set foo bar2 GET]
set new_value [r get foo]
list $old_value $new_value
} {bar bar2}
test {Extended SET GET option with no previous value} {
r del foo
set old_value [r set foo bar GET]
set new_value [r get foo]
list $old_value $new_value
} {{} bar}
test {Extended SET GET with NX option should result in syntax err} {
catch {r set foo bar NX GET} err1
catch {r set foo bar NX GET} err2
list $err1 $err2
} {*syntax err* *syntax err*}
test {Extended SET EX option} {
r del foo
r set foo bar ex 10