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metrics.go
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metrics.go
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package steps
import (
"errors"
"fmt"
"regexp"
"sort"
"github.com/antongulenko/go-onlinestats"
"github.com/bitflow-stream/go-bitflow/bitflow"
"github.com/bitflow-stream/go-bitflow/script/reg"
log "github.com/sirupsen/logrus"
)
type MetricMapperHelper struct {
bitflow.HeaderChecker
outHeader *bitflow.Header
outIndices []int
}
func (helper *MetricMapperHelper) incomingHeader(header *bitflow.Header, description fmt.Stringer, constructIndices func(header *bitflow.Header) ([]int, []string)) error {
if !helper.HeaderChanged(header) {
return nil
}
var outFields []string
helper.outIndices, outFields = constructIndices(header)
if len(helper.outIndices) != len(outFields) {
return errors.New("constructIndices() in MetricMapperHelper.incomingHeader returned non equal sized results")
}
if len(outFields) == 0 {
log.Warnln(description, "removed all metrics")
} else {
log.Println(description, "changes metrics", len(header.Fields), "->", len(outFields))
}
helper.outHeader = header.Clone(outFields)
return nil
}
func (helper *MetricMapperHelper) convertValues(sample *bitflow.Sample) {
// Temporary copy to avoid overwriting values. Can be allocated on the stack.
inValues := make([]bitflow.Value, len(sample.Values))
copy(inValues, sample.Values)
sample.Resize(len(helper.outIndices))
for i, index := range helper.outIndices {
sample.Values[i] = inValues[index]
}
}
func (helper *MetricMapperHelper) convertSample(sample *bitflow.Sample) *bitflow.Sample {
outSample := sample.Clone()
helper.convertValues(outSample)
return outSample
}
type AbstractMetricMapper struct {
bitflow.NoopProcessor
Description fmt.Stringer
ConstructIndices func(header *bitflow.Header) ([]int, []string)
helper MetricMapperHelper
}
func (m *AbstractMetricMapper) Sample(sample *bitflow.Sample, header *bitflow.Header) error {
if err := m.helper.incomingHeader(header, m, m.ConstructIndices); err != nil {
return err
}
sample = m.helper.convertSample(sample)
return m.NoopProcessor.Sample(sample, m.helper.outHeader)
}
func (m *AbstractMetricMapper) String() string {
if desc := m.Description; desc == nil {
return "Abstract Metric Mapper"
} else {
return desc.String()
}
}
type AbstractMetricFilter struct {
AbstractMetricMapper
IncludeFilter func(name string) bool // Return true if metric should be included
}
func (filter *AbstractMetricFilter) constructIndices(header *bitflow.Header) ([]int, []string) {
outFields := make([]string, 0, len(header.Fields))
outIndices := make([]int, 0, len(header.Fields))
include := filter.IncludeFilter
if include == nil {
return nil, nil
}
for index, field := range header.Fields {
if include(field) {
outFields = append(outFields, field)
outIndices = append(outIndices, index)
}
}
return outIndices, outFields
}
type MetricFilter struct {
AbstractMetricFilter
exclude []*regexp.Regexp
include []*regexp.Regexp
}
func NewMetricFilter() *MetricFilter {
res := new(MetricFilter)
res.Description = res
res.ConstructIndices = res.constructIndices
res.IncludeFilter = res.filter
return res
}
func RegisterIncludeMetricsFilter(b reg.ProcessorRegistry) {
b.RegisterStep("include",
func(p *bitflow.SamplePipeline, params map[string]interface{}) error {
filter, err := NewMetricFilter().IncludeRegex(params["m"].(string))
if err == nil {
p.Add(filter)
}
return err
},
"Match every metric with the given regex and only include the matched metrics").
Required("m", reg.String())
}
func RegisterExcludeMetricsFilter(b reg.ProcessorRegistry) {
b.RegisterStep("exclude",
func(p *bitflow.SamplePipeline, params map[string]interface{}) error {
filter, err := NewMetricFilter().ExcludeRegex(params["m"].(string))
if err == nil {
p.Add(filter)
}
return err
},
"Match every metric with the given regex and exclude the matched metrics").
Required("m", reg.String())
}
func (filter *MetricFilter) Exclude(regex *regexp.Regexp) *MetricFilter {
filter.exclude = append(filter.exclude, regex)
return filter
}
func (filter *MetricFilter) ExcludeStr(substr string) *MetricFilter {
res, err := filter.ExcludeRegex(regexp.QuoteMeta(substr))
if err != nil {
panic(err)
}
return res
}
func (filter *MetricFilter) ExcludeRegex(regexStr string) (*MetricFilter, error) {
regex, err := regexp.Compile(regexStr)
if err != nil {
return nil, err
}
return filter.Exclude(regex), nil
}
func (filter *MetricFilter) Include(regex *regexp.Regexp) *MetricFilter {
filter.include = append(filter.include, regex)
return filter
}
func (filter *MetricFilter) IncludeStr(substr string) *MetricFilter {
res, err := filter.IncludeRegex(regexp.QuoteMeta(substr))
if err != nil {
panic(err)
}
return res
}
func (filter *MetricFilter) IncludeRegex(regexStr string) (*MetricFilter, error) {
regex, err := regexp.Compile(regexStr)
if err != nil {
return nil, err
}
return filter.Include(regex), nil
}
func (filter *MetricFilter) filter(name string) bool {
excluded := false
for _, regex := range filter.exclude {
if excluded = regex.MatchString(name); excluded {
break
}
}
if !excluded && len(filter.include) > 0 {
excluded = true
for _, regex := range filter.include {
if excluded = !regex.MatchString(name); !excluded {
break
}
}
}
return !excluded
}
func (filter *MetricFilter) MergeProcessor(other bitflow.SampleProcessor) bool {
if otherFilter, ok := other.(*MetricFilter); !ok {
return false
} else {
filter.exclude = append(filter.exclude, otherFilter.exclude...)
filter.include = append(filter.include, otherFilter.include...)
return true
}
}
func (filter *MetricFilter) String() string {
return fmt.Sprintf("MetricFilter(%v exclude filters, %v include filters)", len(filter.exclude), len(filter.include))
}
type MetricMapper struct {
AbstractMetricMapper
Metrics []string
}
func NewMetricMapper(metrics []string) *MetricMapper {
mapper := &MetricMapper{
Metrics: metrics,
}
mapper.Description = mapper
mapper.ConstructIndices = mapper.constructIndices
return mapper
}
func RegisterMetricMapper(b reg.ProcessorRegistry) {
b.RegisterStep("remap",
func(p *bitflow.SamplePipeline, params map[string]interface{}) error {
p.Add(NewMetricMapper(params["header"].([]string)))
return nil
},
"Change (reorder & filter) the header to the given list of metrics").
Required("header", reg.List(reg.String()))
}
func (mapper *MetricMapper) constructIndices(header *bitflow.Header) ([]int, []string) {
fields := make([]int, 0, len(mapper.Metrics))
metrics := make([]string, 0, len(mapper.Metrics))
for _, metric := range mapper.Metrics {
found := false
for field, inMetric := range header.Fields {
if metric == inMetric {
fields = append(fields, field)
metrics = append(metrics, metric)
found = true
break
}
}
if !found {
log.Warnf("%v: metric %v not found", mapper, metric)
}
}
return fields, metrics
}
func (mapper *MetricMapper) String() string {
maxLen := 3
if len(mapper.Metrics) > maxLen {
return fmt.Sprintf("Metric Mapper: %v ...", mapper.Metrics[:maxLen])
} else {
return fmt.Sprintf("Metric Mapper: %v", mapper.Metrics)
}
}
type AbstractBatchMetricMapper struct {
Description fmt.Stringer
ConstructIndices func(header *bitflow.Header, samples []*bitflow.Sample) ([]int, []string)
}
func (mapper *AbstractBatchMetricMapper) ProcessBatch(header *bitflow.Header, samples []*bitflow.Sample) (*bitflow.Header, []*bitflow.Sample, error) {
var helper MetricMapperHelper
constructIndices := func(_ *bitflow.Header) ([]int, []string) {
return mapper.ConstructIndices(header, samples)
}
if err := helper.incomingHeader(header, mapper, constructIndices); err != nil {
return nil, nil, err
}
for _, sample := range samples {
helper.convertValues(sample)
}
return helper.outHeader, samples, nil
}
func (mapper *AbstractBatchMetricMapper) String() string {
if desc := mapper.Description; desc == nil {
return "Abstract Batch Metric Mapper"
} else {
return desc.String()
}
}
func NewMetricVarianceFilter(minimumWeightedStddev float64) *AbstractBatchMetricMapper {
return &AbstractBatchMetricMapper{
Description: bitflow.String(fmt.Sprintf("Metric Variance Filter (%.2f%%)", minimumWeightedStddev*100)),
ConstructIndices: func(header *bitflow.Header, samples []*bitflow.Sample) ([]int, []string) {
numFields := len(header.Fields)
variances := make([]onlinestats.Running, numFields)
for _, sample := range samples {
for i := range header.Fields {
variances[i].Push(float64(sample.Values[i]))
}
}
indices := make([]int, 0, numFields)
fields := make([]string, 0, numFields)
for i, field := range header.Fields {
weighted_stddev := variances[i].Stddev()
if mean := variances[i].Mean(); mean != 0 {
weighted_stddev /= mean
}
if weighted_stddev >= minimumWeightedStddev {
indices = append(indices, i)
fields = append(fields, field)
}
}
return indices, fields
},
}
}
func RegisterVarianceMetricsFilter(b reg.ProcessorRegistry) {
b.RegisterBatchStep("filter_variance",
func(params map[string]interface{}) (bitflow.BatchProcessingStep, error) {
return NewMetricVarianceFilter(params["min"].(float64)), nil
},
"Filter out the metrics with a variance lower than the given threshold (based on the weighted stddev of the population, stddev/mean)").
Required("min", reg.Float())
}
type MetricRenamer struct {
AbstractMetricMapper
regexes []*regexp.Regexp
replacements []string
}
func NewMetricRenamer(regexes []*regexp.Regexp, replacements []string) *MetricRenamer {
if len(regexes) != len(replacements) {
panic(fmt.Sprintf("MetricRenamer: number of regexes does not match number of replacements (%v != %v)", len(regexes), len(replacements)))
}
renamer := &MetricRenamer{
regexes: regexes,
replacements: replacements,
}
renamer.Description = renamer
renamer.ConstructIndices = renamer.constructIndices
return renamer
}
func RegisterMetricRenamer(b reg.ProcessorRegistry) {
b.RegisterStep("rename",
func(p *bitflow.SamplePipeline, params map[string]interface{}) error {
var regexes []*regexp.Regexp
var replacements []string
for regex, replacement := range params["metrics"].(map[string]string) {
r, err := regexp.Compile(regex)
if err != nil {
return reg.ParameterError(regex, err)
}
regexes = append(regexes, r)
replacements = append(replacements, replacement)
}
p.Add(NewMetricRenamer(regexes, replacements))
return nil
},
"Find the keys (regexes) in every metric name and replace the matched parts with the given values").
Required("metrics", reg.Map(reg.String()))
}
func (r *MetricRenamer) String() string {
return fmt.Sprintf("Metric renamer (%v regexes)", len(r.regexes))
}
func (r *MetricRenamer) constructIndices(header *bitflow.Header) ([]int, []string) {
fields := make(indexedFields, len(header.Fields))
for i, field := range header.Fields {
for i, regex := range r.regexes {
replace := r.replacements[i]
field = regex.ReplaceAllString(field, replace)
}
fields[i].index = i
fields[i].field = field
}
sort.Sort(fields)
indices := make([]int, len(fields))
outFields := make([]string, len(fields))
for i, field := range fields {
indices[i] = field.index
outFields[i] = field.field
}
return indices, outFields
}
func (r *MetricRenamer) MergeProcessor(other bitflow.SampleProcessor) bool {
if otherFilter, ok := other.(*MetricRenamer); !ok {
return false
} else {
r.regexes = append(r.regexes, otherFilter.regexes...)
r.replacements = append(r.replacements, otherFilter.replacements...)
return true
}
}
type indexedFields []struct {
index int
field string
}
func (f indexedFields) Len() int {
return len(f)
}
func (f indexedFields) Less(i, j int) bool {
return f[i].field < f[j].field
}
func (f indexedFields) Swap(i, j int) {
f[i], f[j] = f[j], f[i]
}