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statebagtotag.go
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/
statebagtotag.go
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package tracing
import (
"fmt"
"github.com/opentracing/opentracing-go"
"github.com/zalando/skipper/filters"
)
const (
// Deprecated, use filters.StateBagToTagName instead
StateBagToTagFilterName = filters.StateBagToTagName
)
type stateBagToTagSpec struct{}
type stateBagToTagFilter struct {
stateBagItemName string
tagName string
}
func (stateBagToTagSpec) Name() string {
return filters.StateBagToTagName
}
func (stateBagToTagSpec) CreateFilter(args []interface{}) (filters.Filter, error) {
if len(args) < 1 {
return nil, filters.ErrInvalidFilterParameters
}
stateBagItemName, ok := args[0].(string)
if !ok || stateBagItemName == "" {
return nil, filters.ErrInvalidFilterParameters
}
tagName := stateBagItemName
if len(args) > 1 {
tagNameArg, ok := args[1].(string)
if !ok || tagNameArg == "" {
return nil, filters.ErrInvalidFilterParameters
}
tagName = tagNameArg
}
return stateBagToTagFilter{
stateBagItemName: stateBagItemName,
tagName: tagName,
}, nil
}
func NewStateBagToTag() filters.Spec {
return stateBagToTagSpec{}
}
func (f stateBagToTagFilter) Request(ctx filters.FilterContext) {
span := opentracing.SpanFromContext(ctx.Request().Context())
if span == nil {
return
}
value, ok := ctx.StateBag()[f.stateBagItemName]
if !ok {
return
}
span.SetTag(f.tagName, fmt.Sprint(value))
}
func (stateBagToTagFilter) Response(ctx filters.FilterContext) {}