/
baggagetotag.go
67 lines (52 loc) · 1.3 KB
/
baggagetotag.go
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package tracing
import (
"github.com/opentracing/opentracing-go"
"github.com/zalando/skipper/filters"
)
const (
BaggageToTagFilterName = "tracingBaggageToTag"
)
type baggageToTagSpec struct{}
type baggageToTagFilter struct {
baggageItemName string
tagName string
}
func (baggageToTagSpec) Name() string {
return BaggageToTagFilterName
}
func (baggageToTagSpec) CreateFilter(args []interface{}) (filters.Filter, error) {
if len(args) < 1 {
return nil, filters.ErrInvalidFilterParameters
}
baggageItemName, ok := args[0].(string)
if !ok || baggageItemName == "" {
return nil, filters.ErrInvalidFilterParameters
}
tagName := baggageItemName
if len(args) > 1 {
tagNameArg, ok := args[1].(string)
if !ok || tagNameArg == "" {
return nil, filters.ErrInvalidFilterParameters
}
tagName = tagNameArg
}
return baggageToTagFilter{
baggageItemName,
tagName,
}, nil
}
func NewBaggageToTagFilter() filters.Spec {
return baggageToTagSpec{}
}
func (f baggageToTagFilter) Request(ctx filters.FilterContext) {
span := opentracing.SpanFromContext(ctx.Request().Context())
if span == nil {
return
}
baggageItem := span.BaggageItem(f.baggageItemName)
if baggageItem == "" {
return
}
span.SetTag(f.tagName, baggageItem)
}
func (baggageToTagFilter) Response(ctx filters.FilterContext) {}