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altsvc: cap the list at 5,000 entries

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Avoid never-ending growth.

When adding more entries, it now deletes the first entry in the list,
which is the oldest added entry still held in memory. I decided to avoid
a Least Recently Used concept as I suspect with a list with this many
entries most entries have not been used, and we don't save the timestamp
of recent use anyway.

The net effect might (no matter what) be that the removed entry might
feel a bit "random" in the eyes of the user.

Verify with test 1669.

Reported-by: Geeknik Labs
Fixes #21183
Closes #21189
This commit is contained in:
Daniel Stenberg 2026-04-01 09:53:42 +02:00
parent c1963e2d2c
commit 0805ec043e
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6 changed files with 118 additions and 7 deletions
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<?xml version="1.0" encoding="US-ASCII"?>
<testcase>
<info>
<keywords>
unittest
Alt-Svc
</keywords>
</info>
<client>
<features>
unittest
alt-svc
</features>
# This date is exactly "20190124 22:34:21" UTC
<setenv>
CURL_TIME=1548369261
</setenv>
<name>
alt-svc load cache with >5000 entries
</name>
<command>
%LOGDIR/%TESTNUMBER
</command>
<file name="%LOGDIR/%TESTNUMBER" mode="text">
%repeat[5010 x h2 example.com 443 h3 shiny.example.com 8443 "20191231 00:00:00" 0 0%0a]%
</file>
</client>
<verify>
<limits>
Allocations: 5100
Maximum allocated: 600000
</limits>
</verify>
</testcase>