mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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b9706b20f9
* 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
85 lines
2.3 KiB
Go
85 lines
2.3 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 statsd
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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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// LabelEncoder encodes metric labels in the dogstatsd syntax.
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//
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// TODO: find a link for this syntax. It's been copied out of code,
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// not a specification:
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//
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// https://github.com/stripe/veneur/blob/master/sinks/datadog/datadog.go
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type LabelEncoder struct {
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pool sync.Pool
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}
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// sameCheck is used to test whether label encoders are the same.
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type sameCheck interface {
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isStatsd()
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}
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var _ export.LabelEncoder = &LabelEncoder{}
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// NewLabelEncoder returns a new encoder for dogstatsd-syntax metric
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// labels.
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func NewLabelEncoder() *LabelEncoder {
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return &LabelEncoder{
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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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// Encode emits a string like "|#key1:value1,key2:value2".
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func (e *LabelEncoder) Encode(labels []core.KeyValue) string {
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buf := e.pool.Get().(*bytes.Buffer)
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defer e.pool.Put(buf)
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buf.Reset()
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delimiter := "|#"
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for _, kv := range labels {
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_, _ = buf.WriteString(delimiter)
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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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delimiter = ","
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}
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return buf.String()
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}
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func (e *LabelEncoder) isStatsd() {}
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// ForceEncode returns a statsd label encoding, even if the exported
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// labels were encoded by a different type of encoder. Returns a
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// boolean to indicate whether the labels were in fact re-encoded, to
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// test for (and warn about) efficiency.
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func (e *LabelEncoder) ForceEncode(labels export.Labels) (string, bool) {
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if _, ok := labels.Encoder().(sameCheck); ok {
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return labels.Encoded(), false
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}
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return e.Encode(labels.Ordered()), true
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}
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