mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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88 lines
2.4 KiB
Go
88 lines
2.4 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 prometheus_test
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import (
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"bytes"
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"context"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"go.opentelemetry.io/otel/api/kv"
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"go.opentelemetry.io/otel/api/metric"
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"go.opentelemetry.io/otel/exporters/metric/prometheus"
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"go.opentelemetry.io/otel/sdk/metric/controller/pull"
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"go.opentelemetry.io/otel/sdk/resource"
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)
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// This test demonstrates that it is relatively difficult to setup a
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// Prometheus export pipeline:
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//
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// 1. The default boundaries are difficult to pass, should be []float instead of []metric.Number
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//
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// TODO: Address this issue.
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func ExampleNewExportPipeline() {
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// Create a meter
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exporter, err := prometheus.NewExportPipeline(
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prometheus.Config{},
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pull.WithResource(resource.New(kv.String("R", "V"))),
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)
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if err != nil {
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panic(err)
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}
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meter := exporter.Provider().Meter("example")
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ctx := context.Background()
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// Use two instruments
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counter := metric.Must(meter).NewInt64Counter(
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"a.counter",
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metric.WithDescription("Counts things"),
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)
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recorder := metric.Must(meter).NewInt64ValueRecorder(
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"a.valuerecorder",
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metric.WithDescription("Records values"),
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)
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counter.Add(ctx, 100, kv.String("key", "value"))
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recorder.Record(ctx, 100, kv.String("key", "value"))
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// GET the HTTP endpoint
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var input bytes.Buffer
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resp := httptest.NewRecorder()
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req, err := http.NewRequest("GET", "/", &input)
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if err != nil {
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panic(err)
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}
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exporter.ServeHTTP(resp, req)
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data, err := ioutil.ReadAll(resp.Result().Body)
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if err != nil {
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panic(err)
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}
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fmt.Print(string(data))
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// Output:
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// # HELP a_counter Counts things
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// # TYPE a_counter counter
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// a_counter{R="V",key="value"} 100
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// # HELP a_valuerecorder Records values
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// # TYPE a_valuerecorder histogram
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// a_valuerecorder_bucket{R="V",key="value",le="+Inf"} 1
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// a_valuerecorder_sum{R="V",key="value"} 100
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// a_valuerecorder_count{R="V",key="value"} 1
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}
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