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opentelemetry-go/example/basic/main.go
Krzesimir Nowak 6b4acf47b8 Reorganize propagation code (shrink PR 381) (#444)
* Rename distributedcontext package to correlation

Correlation is the name we agreed upon.

* Move trace propagators to api/trace

The trace propagators tests had to be moved to a testtrace subpackage
to avoid import cycles between api/trace and internal/trace.

Needed to shut up golint about stutter in trace.TraceContext -
TraceContext is a name of a W3C spec, so this stutter is
expected. It's certainly still better than golint's suggestion of
having trace.Context.

* Rename api/propagators to api/propagation

This package will not contain any propagators in the long run, just
the interface definitions.

Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
2020-01-28 10:13:46 -08:00

133 lines
3.6 KiB
Go

// Copyright 2019, OpenTelemetry Authors
//
// Licensed 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.
package main
import (
"context"
"log"
"go.opentelemetry.io/otel/api/correlation"
"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/api/key"
"go.opentelemetry.io/otel/api/metric"
"go.opentelemetry.io/otel/api/trace"
metricstdout "go.opentelemetry.io/otel/exporter/metric/stdout"
tracestdout "go.opentelemetry.io/otel/exporter/trace/stdout"
"go.opentelemetry.io/otel/sdk/metric/controller/push"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
var (
fooKey = key.New("ex.com/foo")
barKey = key.New("ex.com/bar")
lemonsKey = key.New("ex.com/lemons")
anotherKey = key.New("ex.com/another")
)
// initTracer creates and registers trace provider instance.
func initTracer() {
var err error
exp, err := tracestdout.NewExporter(tracestdout.Options{PrettyPrint: false})
if err != nil {
log.Panicf("failed to initialize trace stdout exporter %v", err)
return
}
tp, err := sdktrace.NewProvider(sdktrace.WithSyncer(exp),
sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}))
if err != nil {
log.Panicf("failed to initialize trace provider %v", err)
}
global.SetTraceProvider(tp)
}
func initMeter() *push.Controller {
pusher, err := metricstdout.InstallNewPipeline(metricstdout.Config{
Quantiles: []float64{0.5, 0.9, 0.99},
PrettyPrint: false,
})
if err != nil {
log.Panicf("failed to initialize metric stdout exporter %v", err)
}
return pusher
}
func main() {
defer initMeter().Stop()
initTracer()
// Note: Have to get the meter and tracer after the global is
// initialized. See OTEP 0005.
tracer := global.TraceProvider().Tracer("ex.com/basic")
meter := global.MeterProvider().Meter("ex.com/basic")
oneMetric := meter.NewFloat64Gauge("ex.com.one",
metric.WithKeys(fooKey, barKey, lemonsKey),
metric.WithDescription("A gauge set to 1.0"),
)
measureTwo := meter.NewFloat64Measure("ex.com.two")
ctx := context.Background()
ctx = correlation.NewContext(ctx,
fooKey.String("foo1"),
barKey.String("bar1"),
)
commonLabels := meter.Labels(lemonsKey.Int(10), key.String("A", "1"), key.String("B", "2"), key.String("C", "3"))
gauge := oneMetric.Bind(commonLabels)
defer gauge.Unbind()
measure := measureTwo.Bind(commonLabels)
defer measure.Unbind()
err := tracer.WithSpan(ctx, "operation", func(ctx context.Context) error {
trace.SpanFromContext(ctx).AddEvent(ctx, "Nice operation!", key.New("bogons").Int(100))
trace.SpanFromContext(ctx).SetAttributes(anotherKey.String("yes"))
gauge.Set(ctx, 1)
meter.RecordBatch(
// Note: call-site variables added as context Entries:
correlation.NewContext(ctx, anotherKey.String("xyz")),
commonLabels,
oneMetric.Measurement(1.0),
measureTwo.Measurement(2.0),
)
return tracer.WithSpan(
ctx,
"Sub operation...",
func(ctx context.Context) error {
trace.SpanFromContext(ctx).SetAttributes(lemonsKey.String("five"))
trace.SpanFromContext(ctx).AddEvent(ctx, "Sub span event")
measure.Record(ctx, 1.3)
return nil
},
)
})
if err != nil {
panic(err)
}
}