mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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1ff0f2a26a
* add resource type. * sort attributes in test to fix ci. * add resource keys and update test.
73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
// Copyright 2020, OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package resource provides functionality for resource, which capture
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// identifying information about the entities for which signals are exported.
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package resource
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import (
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"go.opentelemetry.io/otel/api/core"
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)
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// Resource describes an entity about which identifying information and metadata is exposed.
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type Resource struct {
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labels map[core.Key]core.Value
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}
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// New creates a resource from a set of attributes.
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// If there are duplicates keys then the first value of the key is preserved.
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func New(kvs ...core.KeyValue) *Resource {
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res := &Resource{
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labels: map[core.Key]core.Value{},
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}
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for _, kv := range kvs {
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if _, ok := res.labels[kv.Key]; !ok {
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res.labels[kv.Key] = kv.Value
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}
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}
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return res
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}
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// Merge creates a new resource by combining resource a and b.
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// If there are common key between resource a and b then value from resource a is preserved.
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// If one of the resources is nil then the other resource is returned without creating a new one.
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func Merge(a, b *Resource) *Resource {
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if a == nil {
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return b
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}
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if b == nil {
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return a
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}
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res := &Resource{
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labels: map[core.Key]core.Value{},
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}
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for k, v := range b.labels {
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res.labels[k] = v
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}
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// labels from resource a overwrite labels from resource b.
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for k, v := range a.labels {
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res.labels[k] = v
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}
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return res
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}
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// Attributes returns a copy of attributes from the resource.
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func (r Resource) Attributes() []core.KeyValue {
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attrs := make([]core.KeyValue, 0, len(r.labels))
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for k, v := range r.labels {
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attrs = append(attrs, core.KeyValue{Key: k, Value: v})
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}
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return attrs
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}
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