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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package metric | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/gob" | ||
| "errors" | ||
| "fmt" | ||
| "sync" | ||
|
|
||
| "github.com/influxdata/telegraf" | ||
| ) | ||
|
|
||
| // storage for tracking data that can't be serialized to disk | ||
| var ( | ||
| // todo need some way to empty this map out when done with a tracking ID. | ||
| // grouped tracking metrics means that ID->Data association is not one to one, | ||
| // many metrics could be associated with one tracking ID so we cannot just | ||
| // clear this every time in FromBytes. | ||
| trackingStore = make(map[telegraf.TrackingID]telegraf.TrackingData) | ||
| mu = sync.Mutex{} | ||
|
|
||
| // ErrSkipTracking indicates that tracking information could not be found after | ||
| // deserializing a metric from bytes. In this case we should skip the metric | ||
| // and continue as if it does not exist. | ||
| ErrSkipTracking = errors.New("metric tracking data not found") | ||
| ) | ||
|
|
||
| type serializedMetric struct { | ||
| M telegraf.Metric | ||
| TID telegraf.TrackingID | ||
| } | ||
|
|
||
| func ToBytes(m telegraf.Metric) ([]byte, error) { | ||
| var sm serializedMetric | ||
| if um, ok := m.(telegraf.UnwrappableMetric); ok { | ||
| sm.M = um.Unwrap() | ||
| } else { | ||
| sm.M = m | ||
| } | ||
|
|
||
| if tm, ok := m.(telegraf.TrackingMetric); ok { | ||
| sm.TID = tm.TrackingID() | ||
|
|
||
| mu.Lock() | ||
| trackingStore[sm.TID] = tm.TrackingData() | ||
| mu.Unlock() | ||
| } | ||
|
|
||
| var buf bytes.Buffer | ||
| encoder := gob.NewEncoder(&buf) | ||
| if err := encoder.Encode(&sm); err != nil { | ||
| return nil, fmt.Errorf("failed to encode metric to bytes: %w", err) | ||
| } | ||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| func FromBytes(b []byte) (telegraf.Metric, error) { | ||
| buf := bytes.NewBuffer(b) | ||
| decoder := gob.NewDecoder(buf) | ||
|
|
||
| var sm *serializedMetric | ||
| if err := decoder.Decode(&sm); err != nil { | ||
| return nil, fmt.Errorf("failed to decode metric from bytes: %w", err) | ||
| } | ||
|
|
||
| m := sm.M | ||
| if sm.TID != 0 { | ||
| mu.Lock() | ||
| td := trackingStore[sm.TID] | ||
| mu.Unlock() | ||
|
|
||
| if td == nil { | ||
| return nil, ErrSkipTracking | ||
| } | ||
| m = rebuildTrackingMetric(m, td) | ||
| } | ||
| return m, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| package metric | ||
|
|
||
| import "encoding/gob" | ||
|
|
||
| func Init() { | ||
| gob.RegisterName("metric.metric", &metric{}) | ||
| } |
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