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YANYZP 99c299877d
OT resource detector (#939)
* first

* all included

* constant

* res keys

* env detector

* Update sdk/detect/env.go

Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>

* new test cases and strings operation to handle labels

* solved conflict

* typo

* corrected comments

* deleted env var handling

* push again

* rerun

* restructuring

* new way to aggregate errors

* all in resources package and verbose comments

* solved merge conflicts

* included new error types

* improved error handling

* updated changelog.md

* updated changelog

* updated changelog.md

* updated changelog

* Update CHANGELOG.md

Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>
Co-authored-by: Liz Fong-Jones <lizf@honeycomb.io>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
2020-07-20 08:43:51 -07:00

70 lines
1.9 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 (
"context"
"fmt"
"os"
"strings"
"go.opentelemetry.io/otel/api/kv"
)
// envVar is the environment variable name OpenTelemetry Resource information can be assigned to.
const envVar = "OTEL_RESOURCE_LABELS"
var (
//errMissingValue is returned when a resource value is missing.
errMissingValue = fmt.Errorf("%w: missing value", ErrPartialResource)
)
// FromEnv is a detector that implements the Detector and collects resources
// from environment
type FromEnv struct{}
// compile time assertion that FromEnv implements Detector interface
var _ Detector = (*FromEnv)(nil)
// Detect collects resources from environment
func (d *FromEnv) Detect(context.Context) (*Resource, error) {
labels := strings.TrimSpace(os.Getenv(envVar))
if labels == "" {
return Empty(), ErrMissingResource
}
return constructOTResources(labels)
}
func constructOTResources(s string) (*Resource, error) {
pairs := strings.Split(s, ",")
labels := []kv.KeyValue{}
var invalid []string
for _, p := range pairs {
field := strings.SplitN(p, "=", 2)
if len(field) != 2 {
invalid = append(invalid, p)
continue
}
k, v := strings.TrimSpace(field[0]), strings.TrimSpace(field[1])
labels = append(labels, kv.String(k, v))
}
var err error
if len(invalid) > 0 {
err = fmt.Errorf("%w: %v", errMissingValue, invalid)
}
return New(labels...), err
}