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https://github.com/open-telemetry/opentelemetry-go.git
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a8ea3dbb46
* Replace use of old term label with attribute The specification has unified on the term attribute to describe key-value pairs. There exist still many hold-overs of the use of the term label. This updates those uses or deprecates exported types and functions in favor of renamed forms. * fix infinite recursion * Remove backticks from attribute set docs * Remove LabelFilterSelector entirely * Remove Metadata.Labels instead of deprecate * Update changelog with public changes * Revert OC err msg
67 lines
2.0 KiB
Go
67 lines
2.0 KiB
Go
// Copyright The 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 reducer // import "go.opentelemetry.io/otel/sdk/metric/processor/reducer"
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import (
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/metric/export"
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"go.opentelemetry.io/otel/sdk/metric/sdkapi"
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)
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type (
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// Processor implements "dimensionality reduction" by
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// filtering keys from export attribute sets.
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Processor struct {
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export.Checkpointer
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filterSelector AttributeFilterSelector
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}
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// AttributeFilterSelector selects an attribute filter based on the
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// instrument described by the descriptor.
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AttributeFilterSelector interface {
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AttributeFilterFor(descriptor *sdkapi.Descriptor) attribute.Filter
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}
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)
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var _ export.Processor = &Processor{}
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var _ export.Checkpointer = &Processor{}
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// New returns a dimensionality-reducing Processor that passes data to the
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// next stage in an export pipeline.
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func New(filterSelector AttributeFilterSelector, ckpter export.Checkpointer) *Processor {
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return &Processor{
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Checkpointer: ckpter,
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filterSelector: filterSelector,
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}
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}
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// Process implements export.Processor.
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func (p *Processor) Process(accum export.Accumulation) error {
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// Note: the removed attributes are returned and ignored here.
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// Conceivably these inputs could be useful to a sampler.
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reduced, _ := accum.Attributes().Filter(
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p.filterSelector.AttributeFilterFor(
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accum.Descriptor(),
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),
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)
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return p.Checkpointer.Process(
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export.NewAccumulation(
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accum.Descriptor(),
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&reduced,
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accum.Aggregator(),
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),
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)
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}
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