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resource.go
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resource.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package resource // import "go.opentelemetry.io/otel/sdk/resource"
import (
"context"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
)
// Resource describes an entity about which identifying information
// and metadata is exposed. Resource is an immutable object,
// equivalent to a map from key to unique value.
//
// Resources should be passed and stored as pointers
// (`*resource.Resource`). The `nil` value is equivalent to an empty
// Resource.
type Resource struct {
attrs attribute.Set
}
var (
emptyResource Resource
defaultResource *Resource = func(r *Resource, err error) *Resource {
if err != nil {
otel.Handle(err)
}
return r
}(Detect(context.Background(), defaultServiceNameDetector{}, TelemetrySDK{}))
)
// NewWithAttributes creates a resource from attrs. If attrs contains
// duplicate keys, the last value will be used. If attrs contains any invalid
// items those items will be dropped.
func NewWithAttributes(attrs ...attribute.KeyValue) *Resource {
if len(attrs) == 0 {
return &emptyResource
}
// Ensure attributes comply with the specification:
// https://github.com/open-telemetry/opentelemetry-specification/blob/v1.0.1/specification/common/common.md#attributes
s, _ := attribute.NewSetWithFiltered(attrs, func(kv attribute.KeyValue) bool {
return kv.Valid()
})
// If attrs only contains invalid entries do not allocate a new resource.
if s.Len() == 0 {
return &emptyResource
}
return &Resource{s} //nolint
}
// String implements the Stringer interface and provides a
// human-readable form of the resource.
//
// Avoid using this representation as the key in a map of resources,
// use Equivalent() as the key instead.
func (r *Resource) String() string {
if r == nil {
return ""
}
return r.attrs.Encoded(attribute.DefaultEncoder())
}
// Attributes returns a copy of attributes from the resource in a sorted order.
// To avoid allocating a new slice, use an iterator.
func (r *Resource) Attributes() []attribute.KeyValue {
if r == nil {
r = Empty()
}
return r.attrs.ToSlice()
}
// Iter returns an interator of the Resource attributes.
// This is ideal to use if you do not want a copy of the attributes.
func (r *Resource) Iter() attribute.Iterator {
if r == nil {
r = Empty()
}
return r.attrs.Iter()
}
// Equal returns true when a Resource is equivalent to this Resource.
func (r *Resource) Equal(eq *Resource) bool {
if r == nil {
r = Empty()
}
if eq == nil {
eq = Empty()
}
return r.Equivalent() == eq.Equivalent()
}
// Merge creates a new resource by combining resource a and b.
//
// If there are common keys between resource a and b, then the value
// from resource b will overwrite the value from resource a, even
// if resource b's value is empty.
func Merge(a, b *Resource) *Resource {
if a == nil && b == nil {
return Empty()
}
if a == nil {
return b
}
if b == nil {
return a
}
// Note: 'b' attributes will overwrite 'a' with last-value-wins in attribute.Key()
// Meaning this is equivalent to: append(a.Attributes(), b.Attributes()...)
mi := attribute.NewMergeIterator(b.Set(), a.Set())
combine := make([]attribute.KeyValue, 0, a.Len()+b.Len())
for mi.Next() {
combine = append(combine, mi.Label())
}
return NewWithAttributes(combine...)
}
// Empty returns an instance of Resource with no attributes. It is
// equivalent to a `nil` Resource.
func Empty() *Resource {
return &emptyResource
}
// Default returns an instance of Resource with a default
// "service.name" and OpenTelemetrySDK attributes
func Default() *Resource {
return defaultResource
}
// Equivalent returns an object that can be compared for equality
// between two resources. This value is suitable for use as a key in
// a map.
func (r *Resource) Equivalent() attribute.Distinct {
return r.Set().Equivalent()
}
// Set returns the equivalent *attribute.Set of this resources attributes.
func (r *Resource) Set() *attribute.Set {
if r == nil {
r = Empty()
}
return &r.attrs
}
// MarshalJSON encodes the resource attributes as a JSON list of { "Key":
// "...", "Value": ... } pairs in order sorted by key.
func (r *Resource) MarshalJSON() ([]byte, error) {
if r == nil {
r = Empty()
}
return r.attrs.MarshalJSON()
}
// Len returns the number of unique key-values in this Resource.
func (r *Resource) Len() int {
if r == nil {
return 0
}
return r.attrs.Len()
}
// Encoded returns an encoded representation of the resource.
func (r *Resource) Encoded(enc attribute.Encoder) string {
if r == nil {
return ""
}
return r.attrs.Encoded(enc)
}