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Merge pull request #59 from janboll/add-metrics-cache
Implementing metrics caching
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| package pkg | ||
|
|
||
| import ( | ||
| "crypto/sha256" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| dto "github.com/prometheus/client_model/go" | ||
| ) | ||
|
|
||
| type MetricsCache struct { | ||
| cacheMutex *sync.Mutex | ||
| entries map[string]cacheEntry | ||
| ttl time.Duration | ||
| } | ||
|
|
||
| func NewMetricsCache(ttl time.Duration) *MetricsCache { | ||
| return &MetricsCache{ | ||
| cacheMutex: &sync.Mutex{}, | ||
| entries: map[string]cacheEntry{}, | ||
| ttl: ttl, | ||
| } | ||
| } | ||
|
|
||
| func getMetricHash(metric prometheus.Metric) string { | ||
| var dto dto.Metric | ||
| metric.Write(&dto) | ||
| labelString := metric.Desc().String() | ||
|
|
||
| for _, labelPair := range dto.GetLabel() { | ||
| labelString = fmt.Sprintf("%s,%s,%s", labelString, labelPair.GetName(), labelPair.GetValue()) | ||
| } | ||
|
|
||
| checksum := sha256.Sum256([]byte(labelString)) | ||
| return fmt.Sprintf("%x", checksum[:]) | ||
| } | ||
|
|
||
| // AddMetric adds a metric to the cache | ||
| func (mc *MetricsCache) AddMetric(metric prometheus.Metric) { | ||
| mc.cacheMutex.Lock() | ||
| mc.entries[getMetricHash(metric)] = cacheEntry{ | ||
| creation: time.Now(), | ||
| metric: metric, | ||
| } | ||
| mc.cacheMutex.Unlock() | ||
| } | ||
|
|
||
| // GetAllMetrics Iterates over all cached metrics and discards expired ones. | ||
| func (mc *MetricsCache) GetAllMetrics() []prometheus.Metric { | ||
| mc.cacheMutex.Lock() | ||
| returnArr := make([]prometheus.Metric, 0) | ||
| for k, v := range mc.entries { | ||
| if time.Since(v.creation).Seconds() > mc.ttl.Seconds() { | ||
| delete(mc.entries, k) | ||
| } else { | ||
| returnArr = append(returnArr, v.metric) | ||
| } | ||
| } | ||
| mc.cacheMutex.Unlock() | ||
| return returnArr | ||
| } | ||
|
|
||
| type cacheEntry struct { | ||
| creation time.Time | ||
| metric prometheus.Metric | ||
| } |
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