mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-04 20:20:19 +00:00
197 lines
5.4 KiB
Go
197 lines
5.4 KiB
Go
|
// 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{}, FromEnv{}, 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
|
||
|
}
|
||
|
|
||
|
// Environment returns an instance of Resource with attributes
|
||
|
// extracted from the OTEL_RESOURCE_ATTRIBUTES environment variable.
|
||
|
func Environment() *Resource {
|
||
|
detector := &FromEnv{}
|
||
|
resource, err := detector.Detect(context.Background())
|
||
|
if err == nil {
|
||
|
otel.Handle(err)
|
||
|
}
|
||
|
return resource
|
||
|
}
|
||
|
|
||
|
// 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)
|
||
|
}
|