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* Add MetricAggregator.Merge() implementations * Update from feedback * Type * Ckpt * Ckpt * Add push controller * Ckpt * Add aggregator interfaces, stdout encoder * Modify basic main.go * Main is working * Batch stdout output * Sum udpate * Rename stdout * Add stateless/stateful Batcher options * Undo a for-loop in the example, remove a done TODO * Update imports * Add note * Rename defaultkeys * Support variable label encoder to speed OpenMetrics/Statsd export * Lint * Checkpoint * Checkpoint * Doc * Precommit/lint * Simplify Aggregator API * Record->Identifier * Remove export.Record a.k.a. Identifier * Checkpoint * Propagate errors to the SDK, remove a bunch of 'TODO warn' * Checkpoint * Introduce export.Labels * Comments in export/metric.go * Comment * More merge * More doc * Complete example * Lint fixes * Add a testable example * Lint * Dogstats * Let Export return an error * Checkpoint * add a basic stdout exporter test * Add measure test; fix aggregator APIs * Use JSON numbers, not strings * Test stdout exporter error * Add a test for the call to RangeTest * Add error handler API to improve correctness test; return errors from RecordOne * Undo the previous -- do not expose errors * Add simple selector variations, test * Repair examples * Test push controller error handling * Add SDK label encoder tests * Add a defaultkeys batcher test * Add an ungrouped batcher test * Lint new tests * Respond to krnowak's feedback * Checkpoint * Funciontal example using unixgram * Tidy the example * Add a packet-split test * More tests * Undo comment * Use concrete receivers for export records and labels, since the constructors return structs not pointers * Bug fix for stateful batchers; clone an aggregator for long term storage * Remove TODO addressed in #318 * Add errors to all aggregator interfaces * Handle ErrNoLastValue case in stdout exporter * Move aggregator API into sdk/export/metric/aggregator * Update all aggregator exported-method comments * Document the aggregator APIs * More aggregator comments * Add multiple updates to the ungrouped test * Fixes for feedback from Gustavo and Liz * Producer->CheckpointSet; add FinishedCollection * Process takes an export.Record * ReadCheckpoint->CheckpointSet * EncodeLabels->Encode * Format a better inconsistent type error; add more aggregator API tests * More RangeTest test coverage * Make benbjohnson/clock a test-only dependency * Handle ErrNoLastValue in stress_test * Update comments; use a pipe vs a unix socket in the example test * Update test * Spelling * Typo fix * Rename DefaultLabelEncoder to NewDefaultLabelEncoder for clarity * Rename DefaultLabelEncoder to NewDefaultLabelEncoder for clarity * Test different adapters; add ForceEncode to statsd label encoder
63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
// Copyright 2019, 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 metric
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import (
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"bytes"
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"sync"
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"go.opentelemetry.io/otel/api/core"
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export "go.opentelemetry.io/otel/sdk/export/metric"
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)
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type defaultLabelEncoder struct {
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// pool is a pool of labelset builders. The buffers in this
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// pool grow to a size that most label encodings will not
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// allocate new memory. This pool reduces the number of
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// allocations per new LabelSet to 3, typically, as seen in
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// the benchmarks. (It should be 2--one for the LabelSet
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// object and one for the buffer.String() here--see the extra
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// allocation in the call to sort.Stable).
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pool sync.Pool // *bytes.Buffer
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}
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var _ export.LabelEncoder = &defaultLabelEncoder{}
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func NewDefaultLabelEncoder() export.LabelEncoder {
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return &defaultLabelEncoder{
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pool: sync.Pool{
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New: func() interface{} {
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return &bytes.Buffer{}
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},
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},
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}
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}
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func (d *defaultLabelEncoder) Encode(labels []core.KeyValue) string {
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buf := d.pool.Get().(*bytes.Buffer)
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defer d.pool.Put(buf)
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buf.Reset()
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for i, kv := range labels {
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if i > 0 {
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_, _ = buf.WriteRune(',')
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}
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_, _ = buf.WriteString(string(kv.Key))
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_, _ = buf.WriteRune('=')
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_, _ = buf.WriteString(kv.Value.Emit())
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}
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return buf.String()
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}
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