vendor/go.opencensus.io/resource/resource.go

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// Copyright 2018, OpenCensus 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 provides functionality for resource, which capture
// identifying information about the entities for which signals are exported.
package resource

import (
	"context"
	"fmt"
	"os"
	"regexp"
	"sort"
	"strconv"
	"strings"
)

// Environment variables used by FromEnv to decode a resource.
const (
	EnvVarType   = "OC_RESOURCE_TYPE"
	EnvVarLabels = "OC_RESOURCE_LABELS"
)

// Resource describes an entity about which identifying information and metadata is exposed.
// For example, a type "k8s.io/container" may hold labels describing the pod name and namespace.
type Resource struct {
	Type   string
	Labels map[string]string
}

// EncodeLabels encodes a labels map to a string as provided via the OC_RESOURCE_LABELS environment variable.
func EncodeLabels(labels map[string]string) string {
	sortedKeys := make([]string, 0, len(labels))
	for k := range labels {
		sortedKeys = append(sortedKeys, k)
	}
	sort.Strings(sortedKeys)

	s := ""
	for i, k := range sortedKeys {
		if i > 0 {
			s += ","
		}
		s += k + "=" + strconv.Quote(labels[k])
	}
	return s
}

var labelRegex = regexp.MustCompile(`^\s*([[:ascii:]]{1,256}?)=("[[:ascii:]]{0,256}?")\s*,`)