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matrix: report homeserver up, latency and database size through existing collectors

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tuwunel 1.9.4 exports no metrics. The host collector gets an httpcheck
receiver on the gateway's /_matrix/client/versions (new
services.hyperhive.otel.httpChecks, declared by hive-matrix), and a timer in
the hive-matrix container pushes the database directory's size through the
forwarder's OTLP port, as the attic cache-size unit does. The size step
dereferences the state directory's symlink and pushes nothing for a result
under 4096 bytes.
This commit is contained in:
atlas 2026-11-05 01:24:22 +01:00 • committed by mara
commit bef9d401a4
1 changed files with 311 additions and 0 deletions
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74
nix/script-tests/database-size-push.sh Normal file
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# Cases for ./database-size-push.nix. The directory is reached through a
# symlink, as a dynamic user's state directory is. `curl` is a stub that
# records the payload and the URL it is given.
set -uo pipefail
failures=0
fail() {
echo "FAILED: $case: $*" >&2
failures=$((failures + 1))
}
root=$(mktemp -d)
mkdir -p "$root/bin" "$root/private/tuwunel"
head -c 100000 /dev/zero >"$root/private/tuwunel/db"
ln -s "$root/private/tuwunel" "$root/tuwunel"
cat >"$root/bin/curl" <<STUB
#!$BASH
printf '%s\n' "\$*" >"$root/curl.args"
cat >"$root/curl.payload"
STUB
chmod +x "$root/bin/curl"
# Runs the script for \$1, returns its status; stdout and stderr land in files.
run() {
rm -f "$root/curl.args" "$root/curl.payload"
sed "s|@DIR@|$1|" "$SCRIPT_LINK" >"$root/script.sh"
PATH="$root/bin:$PATH" bash "$root/script.sh" >"$root/out" 2>"$root/err"
}
case="a symlinked directory reports the target's size"
want=$(du --summarize --bytes "$root/private/tuwunel/" | cut -f1)
link=$(du --summarize --bytes "$root/tuwunel" | cut -f1)
[ "$want" -ge 100000 ] || fail "fixture target is $want bytes"
[ "$link" -lt 4096 ] || fail "fixture link measures $link bytes, so it does not tell the cases apart"
if run "$root/tuwunel"; then
grep -q "\"asInt\":\"$want\"" "$root/curl.payload" || fail "payload is $(cat "$root/curl.payload"), want asInt $want"
grep -q 'hyperhive.matrix.database_bytes' "$root/curl.payload" || fail "no metric name in the payload"
grep -q '127.0.0.1:8906/v1/metrics' "$root/curl.args" || fail "wrong url: $(cat "$root/curl.args")"
else
fail "the script failed: $(cat "$root/err")"
fi
case="a real directory reports its own size"
if run "$root/private/tuwunel"; then
grep -q "\"asInt\":\"$want\"" "$root/curl.payload" || fail "payload is $(cat "$root/curl.payload"), want asInt $want"
else
fail "the script failed: $(cat "$root/err")"
fi
# `du` stub answering a link-sized number, as an old command line would.
case="an implausibly small size warns and pushes nothing"
cat >"$root/bin/du" <<STUB
#!$BASH
printf '15\t%s\n' "\${@: -1}"
STUB
chmod +x "$root/bin/du"
if run "$root/tuwunel"; then
[ ! -e "$root/curl.payload" ] || fail "pushed $(cat "$root/curl.payload")"
grep -q 'warning' "$root/err" || fail "no warning: $(cat "$root/err")"
else
fail "the script failed: $(cat "$root/err")"
fi
rm "$root/bin/du"
case="a missing directory fails and pushes nothing"
if run "$root/absent"; then
fail "the script succeeded"
fi
[ ! -e "$root/curl.payload" ] || fail "pushed on a missing directory"
[ "$failures" -eq 0 ] || exit 1
echo "all cases passed"