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feat(linux): ✨ switch total cpu context switches and processes create…
…d sensors from totals to rates - total cpu context switches changes to cpu context switch rate - total processes created changes to process creation rate - split cpu usage worker and sensor code into separate files
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| // Copyright (c) 2024 Joshua Rich <[email protected]> | ||
| // | ||
| // This software is released under the MIT License. | ||
| // https://opensource.org/licenses/MIT | ||
|
|
||
| package cpu | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/joshuar/go-hass-agent/internal/hass/sensor" | ||
| "github.com/joshuar/go-hass-agent/internal/hass/sensor/types" | ||
| "github.com/joshuar/go-hass-agent/internal/linux" | ||
| ) | ||
|
|
||
| const ( | ||
| usageUpdateInterval = 10 * time.Second | ||
| usageUpdateJitter = 500 * time.Millisecond | ||
|
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| usageWorkerID = "cpu_usage" | ||
|
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| totalCPUString = "cpu" | ||
| ) | ||
|
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| var ErrParseCPUUsage = errors.New("could not parse CPU usage") | ||
|
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| type usageWorker struct { | ||
| boottime time.Time | ||
| path string | ||
| rateSensors map[string]*rateSensor | ||
| linux.PollingSensorWorker | ||
| clktck int64 | ||
| delta time.Duration | ||
| } | ||
|
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| func (w *usageWorker) UpdateDelta(delta time.Duration) { | ||
| w.delta = delta | ||
| } | ||
|
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| func (w *usageWorker) Sensors(_ context.Context) ([]sensor.Entity, error) { | ||
| return w.getUsageStats() | ||
| } | ||
|
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| func NewUsageWorker(ctx context.Context) (*linux.PollingSensorWorker, error) { | ||
| worker := linux.NewPollingWorker(usageWorkerID, usageUpdateInterval, usageUpdateJitter) | ||
|
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| clktck, found := linux.CtxGetClkTck(ctx) | ||
| if !found { | ||
| return worker, fmt.Errorf("%w: no clktck value", linux.ErrInvalidCtx) | ||
| } | ||
|
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| boottime, found := linux.CtxGetBoottime(ctx) | ||
| if !found { | ||
| return worker, fmt.Errorf("%w: no boottime value", linux.ErrInvalidCtx) | ||
| } | ||
|
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| worker.PollingType = &usageWorker{ | ||
| path: filepath.Join(linux.ProcFSRoot, "stat"), | ||
| boottime: boottime, | ||
| clktck: clktck, | ||
| rateSensors: map[string]*rateSensor{ | ||
| "ctxt": newRateSensor("CPU Context Switch Rate", "mdi:counter", "ctx/s"), | ||
| "processes": newRateSensor("Processes Creation Rate", "mdi:application-cog", "processes/s"), | ||
| }, | ||
| } | ||
|
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| return worker, nil | ||
| } | ||
|
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| func (w *usageWorker) getUsageStats() ([]sensor.Entity, error) { | ||
| var sensors []sensor.Entity | ||
|
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| statsFH, err := os.Open(w.path) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("fetch cpu usage: %w", err) | ||
| } | ||
|
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| defer statsFH.Close() | ||
|
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| statsFile := bufio.NewScanner(statsFH) | ||
| for statsFile.Scan() { | ||
| // Set up word scanner for line. | ||
| line := bufio.NewScanner(bytes.NewReader(statsFile.Bytes())) | ||
| line.Split(bufio.ScanWords) | ||
| // Split line by words | ||
| var cols []string | ||
| for line.Scan() { | ||
| cols = append(cols, line.Text()) | ||
| } | ||
|
|
||
| if len(cols) == 0 { | ||
| return sensors, ErrParseCPUUsage | ||
| } | ||
| // Create a sensor depending on the line. | ||
| switch { | ||
| case cols[0] == totalCPUString: | ||
| sensors = append(sensors, newUsageSensor(w.clktck, cols, types.CategoryDefault)) | ||
| case strings.Contains(cols[0], "cpu"): | ||
| sensors = append(sensors, newUsageSensor(w.clktck, cols, types.CategoryDiagnostic)) | ||
| sensors = append(sensors, newCPUFreqSensor(cols[0])) | ||
| case cols[0] == "ctxt": | ||
| w.rateSensors["ctxt"].update(w.delta, cols[1]) | ||
| sensors = append(sensors, *w.rateSensors["ctxt"].Entity) | ||
| case cols[0] == "processes": | ||
| w.rateSensors["processes"].update(w.delta, cols[1]) | ||
| sensors = append(sensors, *w.rateSensors["processes"].Entity) | ||
| case cols[0] == "procs_running": | ||
| sensors = append(sensors, newCountSensor("Processes Running", "mdi:application-cog", cols[1])) | ||
| case cols[0] == "procs_blocked": | ||
| sensors = append(sensors, newCountSensor("Processes Blocked", "mdi:application-cog", cols[1])) | ||
| } | ||
| } | ||
|
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| return sensors, nil | ||
| } |