50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package attribute // import "go.opentelemetry.io/otel/attribute"
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// Filter supports removing certain attributes from attribute sets. When
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// the filter returns true, the attribute will be kept in the filtered
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// attribute set. When the filter returns false, the attribute is excluded
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// from the filtered attribute set, and the attribute instead appears in
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// the removed list of excluded attributes.
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type Filter func(KeyValue) bool
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// NewAllowKeysFilter returns a Filter that only allows attributes with one of
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// the provided keys.
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//
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// If keys is empty a deny-all filter is returned.
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func NewAllowKeysFilter(keys ...Key) Filter {
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if len(keys) <= 0 {
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return func(kv KeyValue) bool { return false }
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}
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allowed := make(map[Key]struct{}, len(keys))
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for _, k := range keys {
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allowed[k] = struct{}{}
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}
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return func(kv KeyValue) bool {
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_, ok := allowed[kv.Key]
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return ok
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}
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}
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// NewDenyKeysFilter returns a Filter that only allows attributes
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// that do not have one of the provided keys.
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//
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// If keys is empty an allow-all filter is returned.
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func NewDenyKeysFilter(keys ...Key) Filter {
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if len(keys) <= 0 {
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return func(kv KeyValue) bool { return true }
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}
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forbid := make(map[Key]struct{}, len(keys))
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for _, k := range keys {
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forbid[k] = struct{}{}
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}
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return func(kv KeyValue) bool {
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_, ok := forbid[kv.Key]
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return !ok
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}
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}
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