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eebcd56462
Adds fan RPM monitoring as a peer to the existing temperature collection, addressing #1918. --------- Co-authored-by: henrygd <hank@henrygd.me>
88 lines
2.8 KiB
Go
88 lines
2.8 KiB
Go
//go:build testing
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package agent
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import (
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"os"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// writeFile creates path with parents and writes contents.
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func writeFile(t *testing.T, path, contents string) {
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t.Helper()
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require.NoError(t, os.MkdirAll(filepath.Dir(path), 0o755))
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require.NoError(t, os.WriteFile(path, []byte(contents), 0o644))
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}
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// TestReadHwmonFans verifies the /sys/class/hwmon walker:
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// - picks up fan*_input from every chip,
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// - keys entries by chip name + sensor label (or fan idx if no label),
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// - retains 0 RPM for stopped fans,
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// - tolerates chips with no fan files at all.
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func TestReadHwmonFans(t *testing.T) {
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root := t.TempDir()
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// hwmon0: Raspberry Pi 5 active cooler — one fan, no label.
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writeFile(t, filepath.Join(root, "hwmon0", "name"), "pwmfan\n")
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writeFile(t, filepath.Join(root, "hwmon0", "fan1_input"), "6500\n")
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// hwmon1: a thermal-only chip, no fan files. Must not error.
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writeFile(t, filepath.Join(root, "hwmon1", "name"), "cpu_thermal\n")
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writeFile(t, filepath.Join(root, "hwmon1", "temp1_input"), "55000\n")
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// hwmon2: two fans — one stopped (0 RPM) and one labeled "chassis".
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writeFile(t, filepath.Join(root, "hwmon2", "name"), "nct6798\n")
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writeFile(t, filepath.Join(root, "hwmon2", "fan1_input"), "0\n")
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writeFile(t, filepath.Join(root, "hwmon2", "fan2_input"), "1200\n")
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writeFile(t, filepath.Join(root, "hwmon2", "fan2_label"), "chassis\n")
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fans, err := readHwmonFans(root)
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require.NoError(t, err)
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assert.Equal(t, map[string]uint16{
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"pwmfan_fan1": 6500,
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"nct6798_fan1": 0,
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"nct6798_chassis": 1200,
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}, fans)
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}
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// TestReadHwmonFansMissingRoot returns an error rather than panicking when the
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// hwmon root doesn't exist (e.g. running on a kernel without hwmon support).
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func TestReadHwmonFansMissingRoot(t *testing.T) {
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_, err := readHwmonFans(filepath.Join(t.TempDir(), "does-not-exist"))
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assert.Error(t, err)
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}
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// TestReadHwmonFansEmpty returns an empty map (not nil error) when the root
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// exists but contains no chips at all.
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func TestReadHwmonFansEmpty(t *testing.T) {
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root := t.TempDir()
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fans, err := readHwmonFans(root)
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require.NoError(t, err)
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assert.Empty(t, fans)
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}
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func TestFanDiscoveryCache(t *testing.T) {
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root := t.TempDir()
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input := filepath.Join(root, "hwmon0", "fan1_input")
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writeFile(t, filepath.Join(root, "hwmon0", "name"), "chip\n")
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writeFile(t, input, "1000\n")
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getSensors := newFanSensorCache(root)
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sensors, err := getSensors()
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require.NoError(t, err)
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fans := readFanSensors(sensors)
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assert.Equal(t, uint16(1000), fans["chip_fan1"])
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writeFile(t, input, "1200\n")
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writeFile(t, filepath.Join(root, "hwmon0", "fan1_label"), "case\n")
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sensors, err = getSensors()
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require.NoError(t, err)
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fans = readFanSensors(sensors)
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assert.Equal(t, map[string]uint16{"chip_fan1": 1200}, fans)
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}
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