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NETOBSERV-1231: Improve promencode API: scaling & filters (#513)
* Improve promencode API: scaling & filters - New ValueScale config to allow scale conversion, e.g. RTT ns to seconds - To avoid having reserved characters or words in filters, use a dedicated API instead: new setting Filter.Type (exact,presence,absence or regex) - Pre-compute regex by setting up a "predicate" function per filter * Rename func, add doc
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| package encode | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
|
|
||
| "github.com/netobserv/flowlogs-pipeline/pkg/api" | ||
| "github.com/netobserv/flowlogs-pipeline/pkg/config" | ||
| ) | ||
|
|
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| type predicate func(flow config.GenericMap) bool | ||
|
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| type metricInfo struct { | ||
| api.PromMetricsItem | ||
| filterPredicates []predicate | ||
| } | ||
|
|
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| func presence(filter api.PromMetricsFilter) predicate { | ||
| return func(flow config.GenericMap) bool { | ||
| _, found := flow[filter.Key] | ||
| return found | ||
| } | ||
| } | ||
|
|
||
| func absence(filter api.PromMetricsFilter) predicate { | ||
| return func(flow config.GenericMap) bool { | ||
| _, found := flow[filter.Key] | ||
| return !found | ||
| } | ||
| } | ||
|
|
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| func exact(filter api.PromMetricsFilter) predicate { | ||
| return func(flow config.GenericMap) bool { | ||
| if val, found := flow[filter.Key]; found { | ||
| sVal, ok := val.(string) | ||
| if !ok { | ||
| sVal = fmt.Sprint(val) | ||
| } | ||
| return sVal == filter.Value | ||
| } | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| func regex(filter api.PromMetricsFilter) predicate { | ||
| r, _ := regexp.Compile(filter.Value) | ||
| return func(flow config.GenericMap) bool { | ||
| if val, found := flow[filter.Key]; found { | ||
| sVal, ok := val.(string) | ||
| if !ok { | ||
| sVal = fmt.Sprint(val) | ||
| } | ||
| return r.MatchString(sVal) | ||
| } | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| func filterToPredicate(filter api.PromMetricsFilter) predicate { | ||
| switch filter.Type { | ||
| case api.PromFilterExact: | ||
| return exact(filter) | ||
| case api.PromFilterPresence: | ||
| return presence(filter) | ||
| case api.PromFilterAbsence: | ||
| return absence(filter) | ||
| case api.PromFilterRegex: | ||
| return regex(filter) | ||
| } | ||
| // Default = exact | ||
| return exact(filter) | ||
| } | ||
|
|
||
| func CreateMetricInfo(def api.PromMetricsItem) *metricInfo { | ||
| mi := metricInfo{ | ||
| PromMetricsItem: def, | ||
| } | ||
| for _, f := range def.GetFilters() { | ||
| mi.filterPredicates = append(mi.filterPredicates, filterToPredicate(f)) | ||
| } | ||
| return &mi | ||
| } |
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