Installing

go get github.com/signalfx/signalfx-go-tracing

Requires:

• Go 1.12+

Configuration

Configuration values can be set either from environmental variables or code:

SIGNALFX_SERVICE_NAME / WithServiceName Name identifying the service as a whole (defaults to SignalFx-Tracing)

SIGNALFX_ENDPOINT_URL / WithEndpointURL URL to send traces to (defaults to http://localhost:9080/v1/trace)

SIGNALFX_ACCESS_TOKEN / WithAccessToken (no default)

Getting Started

When your application starts enable tracing globally with tracing.Start. For Go or 3rd party libraries you will need to use the wrapper libraries from contrib to have traces automatically emitted.

Here's a basic example of instrumenting Redis:

package main

import (
	"github.com/go-redis/redis"
	redistrace "github.com/signalfx/signalfx-go-tracing/contrib/go-redis/redis"
	"github.com/signalfx/signalfx-go-tracing/tracing"
)

func main() {
	tracing.Start()
	defer tracing.Stop()

	opts := &redis.Options{Addr: "127.0.0.1:6379", Password: "", DB: 0}
	c := redistrace.NewClient(opts)

	c.Set("test_key", "test_value", 0)
}

Instrumentations

These are the currently supported instrumentations with the minimum version requirement.

Library	Version
database/sql	Standard Library
net/http	Standard Library
gin-gonic/gin	1.4
globalsign/mgo	r2018.06.15
mongodb/mongo-go-driver	1.0

API

The API is documented on godoc.

Testing

Tests can be run locally using the Go toolset. The grpc.v12 integration will fail (and this is normal), because it covers for deprecated methods. In the CI environment we vendor this version of the library inside the integration. Under normal circumstances this is not something that we want to do, because users using this integration might be running versions different from the vendored one, creating hard to debug conflicts.

To run integration tests locally, you should set the INTEGRATION environment variable. The dependencies of the integration tests are best run via Docker. To get an idea about the versions and the set-up take a look at our CI config.

The best way to run the entire test suite is using the CircleCI CLI. Simply run circleci build in the repository root. Note that you might have to increase the resources dedicated to Docker to around 4GB.