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Add example that uses OTLP and the collector
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MrAlias committed Jun 4, 2020
2 parents eb14b39 + 9318a73 commit a43367a
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1 change: 1 addition & 0 deletions .gitignore
Expand Up @@ -15,6 +15,7 @@ coverage.*
/example/http/server/server
/example/jaeger/jaeger
/example/namedtracer/namedtracer
/example/otlp/otel-test
/example/prometheus/prometheus
/example/zipkin/zipkin
/example/otel-collector/otel-collector
80 changes: 80 additions & 0 deletions example/otlp/README.md
@@ -0,0 +1,80 @@
# OTLP Example
This example demonstrates how to export trace and metric data from an
application using OpenTelemetry's own wire protocol
[OTLP](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/protocol/README.md).
We will also walk you through configuring a collector to accept OTLP exports.

### How to run?

#### Prequisites
- go >=1.13 installed
- OpenTelemetry collector is available

#### Configure the Collector
Follow the instructions [on the
website](https://opentelemetry.io/docs/collector/about/) to install a working
instance of the collector. This example assumes you have the collector installed
locally.

To configure the collector to accept OTLP traffic from our application,
ensure that it has the following configs:

```yaml
receivers:
otlp:
endpoint: 0.0.0.0:55680 # listens to localhost:55680

# potentially other receivers

service:
pipelines:

traces:
receivers:
- otlp
# potentially other receivers
processors: # whatever processors you need
exporters: # wherever you want your data to go

metrics:
receivers:
-otlp
# potentially other receivers
processors: etc
exporters: etc

# other services
```

An example config has been provided at
[example-otlp-config.yaml](otlp/example-otlp-config.yaml).

Then to run:
```sh
./[YOUR_COLLECTOR_BINARY] --config [PATH_TO_CONFIG]
```

If you use the example config, it's set to export to `stdout`. If you run
the collector on the same machine as the example application, you should
see trace and metric outputs from the collector.

#### Start the Application
An example application is included in this directory. It simulates the process
of scribing a spell scroll (e.g. in [D&D](https://roll20.net/compendium/dnd5e/Spell%20Scroll#content)).
The application has been instrumented and exports both trace and metric data
via OTLP to any listening receiver. To run it:

```sh
go get -d go.opentelemetry.io/otel
cd $GOPATH/go.opentelemetry.io/otel/example/otlp
go run main.go
```

The application is currently configured to transmit exported data to
`localhost:55680`. See [main.go](otlp/main.go) for full details.

After starting the application, you should see trace and metric log output
on the collector.

Note, if the receiver is incorrectly configured to take in metric data, the
application may complain about being unable to connect.
29 changes: 29 additions & 0 deletions example/otlp/example-otlp-config.yaml
@@ -0,0 +1,29 @@
extensions:
health_check:

receivers:
otlp:
endpoint: 0.0.0.0:55680

processors:
batch:
queued_retry:

exporters:
logging:
loglevel: debug

service:

pipelines:

traces:
receivers: [otlp]
processors: [batch, queued_retry]
exporters: [logging]

metrics:
receivers: [otlp]
exporters: [logging]

extensions: [health_check]
13 changes: 13 additions & 0 deletions example/otlp/go.mod
@@ -0,0 +1,13 @@
module go.opentelemetry.io/otel/example/otel-test

go 1.13

replace (
go.opentelemetry.io/otel => ../..
go.opentelemetry.io/otel/exporters/otlp => ../../exporters/otlp
)

require (
go.opentelemetry.io/otel v0.6.0
go.opentelemetry.io/otel/exporters/otlp v0.6.0
)
109 changes: 109 additions & 0 deletions example/otlp/go.sum
@@ -0,0 +1,109 @@
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116 changes: 116 additions & 0 deletions example/otlp/main.go
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// Copyright The 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.
//
// Example application showcasing opentelemetry Go using the OTLP wire
// protocol

package main

import (
"context"
"fmt"
"log"
"time"

"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/api/kv"
"go.opentelemetry.io/otel/api/metric"
"go.opentelemetry.io/otel/exporters/otlp"
"go.opentelemetry.io/otel/sdk/metric/controller/push"
"go.opentelemetry.io/otel/sdk/metric/selector/simple"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)

// Initializes an OTLP exporter, and configures the corresponding trace and
// metric providers.
func initProvider() (*otlp.Exporter, *push.Controller) {
exp, err := otlp.NewExporter(
otlp.WithInsecure(),
otlp.WithAddress("localhost:55680"),
)
handleErr(err, "Failed to create exporter: $v")

traceProvider, err := sdktrace.NewProvider(
sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
sdktrace.WithSyncer(exp),
)
handleErr(err, "Failed to create trace provider: %v")

pusher := push.New(
simple.NewWithExactDistribution(),
exp,
push.WithStateful(true),
push.WithPeriod(2*time.Second),
)

global.SetTraceProvider(traceProvider)
global.SetMeterProvider(pusher.Provider())
pusher.Start()

return exp, pusher
}

func main() {
exp, pusher := initProvider()
defer handleErr(exp.Stop(), "Failed to stop exporter")
defer pusher.Stop() // pushes any last exports to the receiver

tracer := global.Tracer("mage-sense")
meter := global.Meter("mage-read")

// labels represent additional descriptors that can be bound to a metric
// observer or recorder. In this case they describe the location in
// which a spell scroll is scribed.
commonLabels := []kv.KeyValue{
kv.String("work-room", "East Scriptorium"),
kv.String("occupancy", "69,105"),
kv.String("priority", "Ultra"),
}

// Observer metric example
oneMetricCB := func(_ context.Context, result metric.Float64ObserverResult) {
result.Observe(1, commonLabels...)
}
_ = metric.Must(meter).NewFloat64ValueObserver("scrying.glass.one", oneMetricCB,
metric.WithDescription("A ValueObserver set to 1.0"),
)

// Recorder metric example
valuerecorder := metric.Must(meter).
NewFloat64ValueRecorder("scrying.glass.two").
Bind(commonLabels...)
defer valuerecorder.Unbind()

// work begins
ctx, span := tracer.Start(context.Background(), "Archmage-Overlord-Inspection")
for i := 0; i < 10; i++ {
_, innerSpan := tracer.Start(ctx, fmt.Sprintf("Minion-%d", i))
log.Println("Minions hard at work, scribing...")
valuerecorder.Record(ctx, float64(i)*1.5)

<-time.After(time.Second)
innerSpan.End()
}

span.End()
<-time.After(time.Second)

log.Println("Spell-scroll scribed!")
}

func handleErr(err error, message string) {
if err != nil {
log.Fatalf("%s: %v", message, err)
}
}

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