processor/lsmintervalprocessor/internal/identity/resource.go

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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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.

// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

// This is a copy of the internal module from opentelemetry-collector-contrib:
// https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/internal/exp/metrics/identity

package identity // import "github.com/elastic/opentelemetry-collector-components/processor/lsmintervalprocessor/internal/identity"

import (
	"hash"
	"hash/fnv"

	"go.opentelemetry.io/collector/pdata/pcommon"

	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil"
)

type resource = Resource

type Resource struct {
	attrs [16]byte
}

func (r Resource) Hash() hash.Hash64 {
	sum := fnv.New64a()
	sum.Write(r.attrs[:])
	return sum
}

func OfResource(r pcommon.Resource) Resource {
	return Resource{
		attrs: pdatautil.MapHash(r.Attributes()),
	}
}