Enhancement: not call GetCurrentTime when possible

[mapleFU]

Note: this merge request will regard expire <= 0 as "not has expire", maybe break the constraint before.

This mr solves issue #708

[mapleFU]

ASAN:DEADLYSIGNAL
=================================================================
==30388==ERROR: AddressSanitizer: SEGV on unknown address 0x0000000000f0 (pc 0x55c5e3f1823b bp 0x7fb31cbe58b0 sp 0x7fb31cbe5888 T103)
==30388==The signal is caused by a READ memory access.
==30388==Hint: address points to the zero page.

emmm, does this caused by my commits? No idea why this occurs

[git-hulk]

ASAN:DEADLYSIGNAL

==30388==ERROR: AddressSanitizer: SEGV on unknown address 0x0000000000f0 (pc 0x55c5e3f1823b bp 0x7fb31cbe58b0 sp 0x7fb31cbe5888 T103)
==30388==The signal is caused by a READ memory access.
==30388==Hint: address points to the zero page.

emmm, does this caused by my commits? No idea why this occurs

Yes, this failure isn't related to current PR, will record the stack and rerun CI.

[git-hulk]

LGTM

[mapleFU]

Yes, this failure isn't related to current PR, will record the stack and rerun CI.

It might be some concurrency problems on shutdown, since 0x0000000000f0 is a strange address.

[tisonkun]

This mr solves issue #709

@mapleFU there is no "issue" #709 .

[mapleFU]

@mapleFU there is no "issue" #709 .

So sorry for making the mistake, I have update it to #708. PTAL

[mapleFU]

I think it's from redis: https://redis.io/commands/ttl/ @tisonkun

We can use a enum to represent them

[git-hulk]

Thanks all, merging...