Adds: `L/RPOP <key> [count]`
Implements no. 2 of the following strategies:
1. Loop on listTypePop - this would result in multiple calls for memory freeing and allocating (see 769167a079)
2. Iterate the range to build the reply, then call quickListDelRange - this requires two iterations and **is the current choice**
3. Refactor quicklist to have a pop variant of quickListDelRange - probably optimal but more complex
Also:
* There's a historical check for NULL after calling listTypePop that was converted to an assert.
* This refactors common logic shared between LRANGE and the new form of LPOP/RPOP into addListRangeReply (adds test for b/w compat)
* Consequently, it may have made sense to have `LRANGE l -1 -2` and `LRANGE l 9 0` be legit and return a reverse reply. Due to historical reasons that would be, however, a breaking change.
* Added minimal comments to existing commands to adhere to the style, make core dev life easier and get commit karma, naturally.
Adds: `L/RPOP <key> [count]`
Implements no. 2 of the following strategies:
1. Loop on listTypePop - this would result in multiple calls for memory freeing and allocating (see 769167a079)
2. Iterate the range to build the reply, then call quickListDelRange - this requires two iterations and **is the current choice**
3. Refactor quicklist to have a pop variant of quickListDelRange - probably optimal but more complex
Also:
* There's a historical check for NULL after calling listTypePop that was converted to an assert.
* This refactors common logic shared between LRANGE and the new form of LPOP/RPOP into addListRangeReply (adds test for b/w compat)
* Consequently, it may have made sense to have `LRANGE l -1 -2` and `LRANGE l 9 0` be legit and return a reverse reply. Due to historical reasons that would be, however, a breaking change.
* Added minimal comments to existing commands to adhere to the style, make core dev life easier and get commit karma, naturally.
The commit deals with the syncWithMaster and the ugly state machine in it.
It attempts to clean it a bit, but more importantly it uses pipeline for
part of the work (rather than 7 round trips, we now have 4).
i.e. the connect and PING are separate, then AUTH + 3 REPLCONF in one pipeline,
and finally the PSYNC (must be separate since the master has to have an empty
output buffer).
The commit deals with the syncWithMaster and the ugly state machine in it.
It attempts to clean it a bit, but more importantly it uses pipeline for
part of the work (rather than 7 round trips, we now have 4).
i.e. the connect and PING are separate, then AUTH + 3 REPLCONF in one pipeline,
and finally the PSYNC (must be separate since the master has to have an empty
output buffer).
This is just a refactoring commit.
This function was never actually used as a synchronous (do both send or
receive), it was always used only ine one of the two modes, which meant it
has to take extra arguments that are not relevant for the other.
Besides that, a tool that sends a synchronous command, it not something
we want in our toolbox (synchronous IO in single threaded app is evil).
sendSynchronousCommand was now refactored into separate sending and
receiving APIs, and the sending part has two variants, one taking vaargs,
and the other taking argc+argv (and an optional length array which means
you can use binary sds strings).
This is just a refactoring commit.
This function was never actually used as a synchronous (do both send or
receive), it was always used only ine one of the two modes, which meant it
has to take extra arguments that are not relevant for the other.
Besides that, a tool that sends a synchronous command, it not something
we want in our toolbox (synchronous IO in single threaded app is evil).
sendSynchronousCommand was now refactored into separate sending and
receiving APIs, and the sending part has two variants, one taking vaargs,
and the other taking argc+argv (and an optional length array which means
you can use binary sds strings).
As discussed in https://github.com/antirez/redis/issues/7364, it is good
to have a HELLO command variant, which does not switch the current proto
version of a redis server.
While `HELLO` will work, it introduced a certain difficulty on parsing
options of the command. We will need to offset the index of authentication
and setname option by -1.
So 0 is marked a special version meaning non-switching. And we do not
need to change the code much.
As discussed in https://github.com/antirez/redis/issues/7364, it is good
to have a HELLO command variant, which does not switch the current proto
version of a redis server.
While `HELLO` will work, it introduced a certain difficulty on parsing
options of the command. We will need to offset the index of authentication
and setname option by -1.
So 0 is marked a special version meaning non-switching. And we do not
need to change the code much.
