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feat: #58 send caddy and system metrics to ptah-server
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package ptah_agent | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "slices" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/pkg/errors" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/common/expfmt" | ||
|
|
||
| caddyClient "github.com/ptah-sh/ptah-agent/internal/pkg/caddy-client" | ||
| ) | ||
|
|
||
| type MetricsAgent struct { | ||
| client *SafeClient | ||
| caddyClient *caddyClient.Client | ||
| interval time.Duration | ||
| stopChan chan struct{} | ||
| wg sync.WaitGroup | ||
| } | ||
|
|
||
| func NewMetricsAgent(client *SafeClient, caddyClient *caddyClient.Client, interval time.Duration) *MetricsAgent { | ||
| return &MetricsAgent{ | ||
| client: client, | ||
| caddyClient: caddyClient, | ||
| interval: interval, | ||
| stopChan: make(chan struct{}), | ||
| } | ||
| } | ||
|
|
||
| func (m *MetricsAgent) ScrapeMetrics(ctx context.Context) ([]string, error) { | ||
| // TODO: adjust the timestamp value to stick to a resolution of 5 seconds (or whatever else server wants) | ||
| // something like time.Now().Truncate(5 * time.Second).UnixMilli() | ||
| timestamp := time.Now().UnixMilli() | ||
|
|
||
| caddyMetrics, err := m.caddyClient.GetMetrics(ctx) | ||
| if err != nil { | ||
| log.Printf("failed to get caddy metrics: %v", err) | ||
| } | ||
|
|
||
| err = scrapeSystemMetrics() | ||
| if err != nil { | ||
| log.Printf("failed to scrape system metrics: %v", err) | ||
| } | ||
|
|
||
| sysMetrics, err := prometheus.DefaultGatherer.Gather() | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to gather metrics") | ||
| } | ||
|
|
||
| buf := bytes.NewBuffer([]byte{}) | ||
|
|
||
| for _, mf := range sysMetrics { | ||
| _, err = expfmt.MetricFamilyToText(buf, mf) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to expfmt to temporary buffer") | ||
| } | ||
| } | ||
|
|
||
| sysMetricsSlice := strings.Split(buf.String(), "\n") | ||
| allMetrics := slices.Concat(caddyMetrics, sysMetricsSlice) | ||
|
|
||
| result := make([]string, 0, len(allMetrics)) | ||
| for _, s := range allMetrics { | ||
| if strings.Contains(s, "ptah_") { | ||
| if s[0] != '#' { | ||
| s = fmt.Sprintf("%s %d", s, timestamp) | ||
| } | ||
|
|
||
| result = append(result, s) | ||
| } | ||
| } | ||
|
|
||
| return result, nil | ||
| } | ||
|
|
||
| func (m *MetricsAgent) Start(ctx context.Context) error { | ||
| metrics, err := m.ScrapeMetrics(ctx) | ||
| if err != nil { | ||
| log.Printf("failed to collect metrics: %v", err) | ||
| } | ||
|
|
||
| err = m.client.SendMetrics(ctx, metrics) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| go func() { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-time.After(m.interval): | ||
| ctx, cancel := context.WithTimeout(ctx, 2*time.Second) | ||
| defer cancel() | ||
|
|
||
| metrics, err := m.ScrapeMetrics(ctx) | ||
| if err != nil { | ||
| log.Printf("failed to collect metrics: %v", err) | ||
|
|
||
| continue | ||
| } | ||
|
|
||
| err = m.client.SendMetrics(ctx, metrics) | ||
| if err != nil { | ||
| log.Printf("failed to send metrics: %v", err) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (m *MetricsAgent) Stop() { | ||
| close(m.stopChan) | ||
| m.wg.Wait() | ||
| } |
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