clean up source and add publisher status

[NodeBoy2]

Open the code for cleaning SrsSource, refer to: #713
At the same time, add a variable to check if SrsSource is active, to handle the case where fetch_or_create() is not used (publish or consume). Solve the issues #1509 and #1553.

---

TRANS_BY_GPT3

[NodeBoy2]

Test

Test Logic

Use sb_rtmp_publish to push the stream, and all push addresses are different.

Test script logic (using 50*20 routes as an example):

• Loop 20 times

  • Start sb_rtmp_publish to push the stream in the background 50 times
  • Sleep for 30 seconds
  • killall -9 sb_rtmp_publish

• Sleep for 10 seconds

• The script is executed twice, with a one-minute interval in between, to record the difference between the two runs.

Test Results

	Run 1 pool size	Run 2 pool size	Pool difference	Run 1 _st_active_count size	Run 2 _st_active_count size	_st_active_count difference	Run 1 VIRT/RES	Run 2 VIRT/RES	VIRT/RES difference
Before modification 50*20 routes (without service restart)	1857	2869	1012	3721	5747	2026	362m/93m	522m/124m	160m/31m
Before modification 50*20 routes (with service restart)	1004	2004	1000	2015	4017	2000	221m/61m	394m/105m	173m/44m
After modification 50*20 routes	0	0	0	7	7	0	88324/36m	88756/37m	0.4m/1m
After modification 100*30 routes	0	0	0	7	7	0	210m/149m	213m/152m	3m/3m
After modification 500*30 routes	0	0	0	7	7	0	638m/427m	656m/445m	18m/18m

TRANS_BY_GPT3

[winlinvip]

Like first, then watch 👍

Due to the 2.0 release being frozen for 2 years, such a big modification cannot be made.
Please submit it for the 3.0 release, which is currently in the alpha7 stage. We can consider merging this modification.

I will close this PR for now. If anyone needs to merge it into the 2.0 release, they can consider doing it themselves.

TRANS_BY_GPT3