mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-12 10:04:29 +02:00
1f5b159161
* Refactor golangci-lint conf Order settings alphabetically. * Add revive settings to golangci conf * Check blank imports * Check bool-literal-in-expr * Check constant-logical-expr * Check context-as-argument * Check context-key-type * Check deep-exit * Check defer * Check dot-imports * Check duplicated-imports * Check early-return * Check empty-block * Check empty-lines * Check error-naming * Check error-return * Check error-strings * Check errorf * Stop ignoring context first arg in tests * Check exported comments * Check flag-parameter * Check identical branches * Check if-return * Check increment-decrement * Check indent-error-flow * Check deny list of go imports * Check import shadowing * Check package comments * Check range * Check range val in closure * Check range val address * Check redefines builtin id * Check string-format * Check struct tag * Check superfluous else * Check time equal * Check var naming * Check var declaration * Check unconditional recursion * Check unexported return * Check unhandled errors * Check unnecessary stmt * Check unnecessary break * Check waitgroup by value * Exclude deep-exit check in example*_test.go files
114 lines
3.4 KiB
Go
114 lines
3.4 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 metric_test
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import (
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"context"
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"fmt"
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"runtime"
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"time"
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"go.opentelemetry.io/otel/metric"
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"go.opentelemetry.io/otel/metric/instrument"
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"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
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"go.opentelemetry.io/otel/metric/unit"
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)
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//nolint:govet // Meter doesn't register for go vet
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func ExampleMeter_synchronous() {
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// In a library or program this would be provided by otel.GetMeterProvider().
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meterProvider := metric.NewNoopMeterProvider()
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workDuration, err := meterProvider.Meter("go.opentelemetry.io/otel/metric#SyncExample").SyncInt64().Histogram(
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"workDuration",
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instrument.WithUnit(unit.Milliseconds))
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if err != nil {
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fmt.Println("Failed to register instrument")
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panic(err)
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}
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startTime := time.Now()
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ctx := context.Background()
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// Do work
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// ...
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workDuration.Record(ctx, time.Since(startTime).Milliseconds())
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}
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//nolint:govet // Meter doesn't register for go vet
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func ExampleMeter_asynchronous_single() {
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// In a library or program this would be provided by otel.GetMeterProvider().
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meterProvider := metric.NewNoopMeterProvider()
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meter := meterProvider.Meter("go.opentelemetry.io/otel/metric#AsyncExample")
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memoryUsage, err := meter.AsyncInt64().Gauge(
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"MemoryUsage",
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instrument.WithUnit(unit.Bytes),
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)
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if err != nil {
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fmt.Println("Failed to register instrument")
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panic(err)
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}
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err = meter.RegisterCallback([]instrument.Asynchronous{memoryUsage},
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func(ctx context.Context) {
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// instrument.WithCallbackFunc(func(ctx context.Context) {
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//Do Work to get the real memoryUsage
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// mem := GatherMemory(ctx)
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mem := 75000
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memoryUsage.Observe(ctx, int64(mem))
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})
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if err != nil {
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fmt.Println("Failed to register callback")
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panic(err)
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}
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}
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//nolint:govet // Meter doesn't register for go vet
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func ExampleMeter_asynchronous_multiple() {
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meterProvider := metric.NewNoopMeterProvider()
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meter := meterProvider.Meter("go.opentelemetry.io/otel/metric#MultiAsyncExample")
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// This is just a sample of memory stats to record from the Memstats
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heapAlloc, _ := meter.AsyncInt64().UpDownCounter("heapAllocs")
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gcCount, _ := meter.AsyncInt64().Counter("gcCount")
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gcPause, _ := meter.SyncFloat64().Histogram("gcPause")
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err := meter.RegisterCallback([]instrument.Asynchronous{
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heapAlloc,
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gcCount,
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},
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func(ctx context.Context) {
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memStats := &runtime.MemStats{}
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// This call does work
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runtime.ReadMemStats(memStats)
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heapAlloc.Observe(ctx, int64(memStats.HeapAlloc))
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gcCount.Observe(ctx, int64(memStats.NumGC))
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// This function synchronously records the pauses
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computeGCPauses(ctx, gcPause, memStats.PauseNs[:])
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},
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)
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if err != nil {
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fmt.Println("Failed to register callback")
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panic(err)
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}
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}
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//This is just an example, see the the contrib runtime instrumentation for real implementation.
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func computeGCPauses(ctx context.Context, recorder syncfloat64.Histogram, pauseBuff []uint64) {}
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