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Make minmdns advertiser send a TTL=0 record broadcast when services are removed. #19692

Merged
merged 7 commits into from
Jun 17, 2022
Merged

Make minmdns advertiser send a TTL=0 record broadcast when services are removed. #19692

merged 7 commits into from
Jun 17, 2022

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andy31415
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Problem

MinMDNS hardcodes a TTL for all records of 2 minutes (since it actually does not really know about real validity).

This means for fast operations (e.g. advertise commissionable and then actually commission), the device will stay up for 2 minutes for servers that implement caching and honor ttl (e.g. bonjour, avahi, other non min-mdns systems)

Change overview

Support a "send all records with TTL=0" operation min minmdns. Use this in MinMdns advertiser.
Cleanup shutdown logic in minmdns demo server, however since that does not use the real advertiser, it will not send either of boot time or shut down advertisements. This one did not seem as important to fix (2 min timeout seems ok here).

Testing

a) started all-clusters-app on linux, noticed that avahi-browse stops showing the services immediately after ^C (before they persisted)
b) Adjusted one unit test to validate that "set TTL to 0" works
c) CI will validate that normal operations are still ok - specifically commission and operation tests on linux use minMDNS.

@andy31415 andy31415 mentioned this pull request Jun 16, 2022
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github-actions bot commented Jun 16, 2022 •
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PR #19692: Size comparison from 3963c1b to 6c383da

Increases (22 builds for efr32, esp32, linux, mbed, p6)
platform target config section 3963c1b 6c383da change % change
efr32 lighting-app BRD4161A+rs911x (read only) 799092 799412 320 0.0
.text 799084 799404 320 0.0
lock-app BRD4161A+wf200 (read only) 965524 965796 272 0.0
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esp32 all-clusters-app c3devkit (read only) 1012634 1012888 254 0.0
.flash.text 1012634 1012888 254 0.0
m5stack (read only) 1067171 1067423 252 0.0
.flash.text 1061787 1062039 252 0.0
linux all-clusters-app debug (read only) 2929609 2930681 1072 0.0
.rodata 259421 259741 320 0.1
.text 2493746 2494498 752 0.0
all-clusters-minimal-app debug (read only) 2783321 2784393 1072 0.0
.rodata 260957 261277 320 0.1
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bridge-app debug+rpc (read only) 2285953 2286945 992 0.0
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chip-tool debug (read only) 10140077 10141069 992 0.0
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.text 8225621 8226357 736 0.0
chip-tool-no-interactive-ipv6only arm64 (read only) 9881836 9882380 544 0.0
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lighting-app debug+rpc (read only) 2518705 2519729 1024 0.0
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lock-app debug (read only) 2457417 2458457 1040 0.0
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.rodata 203616 203904 288 0.1
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.text 2168256 2168816 560 0.0
tv-app debug (read only) 3067169 3068161 992 0.0
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tv-casting-app debug (read only) 5550025 5551017 992 0.0
.rodata 341193 341449 256 0.1
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mbed lock-app CY8CPROTO_062_4343W+release (read/write) 2437720 2437976 256 0.0
.text 1400364 1400620 256 0.0
p6 all-clusters-app default (read/write) 2553568 2553888 320 0.0
.text 1511832 1512152 320 0.0
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light-app default (read/write) 2430160 2430496 336 0.0
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lock-app default (read/write) 2450784 2451120 336 0.0
.text 1409048 1409384 336 0.0
Decreases (2 builds for cyw30739, telink)
platform target config section 3963c1b 6c383da change % change
cyw30739 ota-requestor-no-progress-logging cyw930739m2evb_01 (read/write) 616078 616070 -8 -0.0
.app_xip_area 473632 473624 -8 -0.0
telink lighting-app tlsr9518adk80d text 576068 576066 -2 -0.0
Full report (41 builds for cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)
platform target config section 3963c1b 6c383da change % change
cc13x2_26x2 all-clusters-app LP_CC2652R7 (read only) 659563 659563 0 0.0
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bzbarsky-apple
bzbarsky-apple approved these changes Jun 17, 2022
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src/lib/dnssd/Advertiser_ImplMinimalMdns.cpp Outdated Show resolved Hide resolved
src/lib/dnssd/Advertiser_ImplMinimalMdns.cpp Outdated Show resolved Hide resolved
src/lib/dnssd/Advertiser_ImplMinimalMdns.cpp Outdated Show resolved Hide resolved
src/lib/dnssd/minimal_mdns/Parser.h Outdated Show resolved Hide resolved
src/lib/dnssd/minimal_mdns/Parser.h Outdated Show resolved Hide resolved
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src/lib/dnssd/minimal_mdns/responders/Responder.h Outdated Show resolved Hide resolved
@andy31415 andy31415 merged commit c5c6ab8 into project-chip:master Jun 17, 2022
@andy31415 andy31415 mentioned this pull request Jul 5, 2022
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@andy31415 andy31415 mentioned this pull request Oct 12, 2022
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