Skip to main content
Version: fibernewrelic_v1.x.x

Otelfiber

Release Discord Test Security Linter

OpenTelemetry support for Fiber.

Can be found on OpenTelemetry Registry.

Note: Requires Go 1.19 and above

Install

This middleware supports Fiber v2.

go get -u github.com/gofiber/contrib/otelfiber/v2

Signature

otelfiber.Middleware(opts ...otelfiber.Option) fiber.Handler

Config

You can configure the middleware using functional parameters

FunctionArgument TypeDescriptionDefault
WithNextfunc(*fiber.Ctx) boolDefine a function to skip this middleware when returned true .nil
WithTracerProvideroteltrace.TracerProviderSpecifies a tracer provider to use for creating a tracer.nil - the global tracer provider is used
WithMeterProviderotelmetric.MeterProviderSpecifies a meter provider to use for reporting.nil - the global meter provider is used
WithPortintSpecifies the value to use when setting the net.host.port attribute on metrics/spans.Defaults to (80 for http, 443 for https)
WithPropagatorspropagation.TextMapPropagatorSpecifies propagators to use for extracting information from the HTTP requests.If none are specified, global ones will be used
WithServerNamestringSpecifies the value to use when setting the http.server_name attribute on metrics/spans.-
WithSpanNameFormatterfunc(*fiber.Ctx) stringTakes a function that will be called on every request and the returned string will become the span Name.Default formatter returns the route pathRaw
WithCustomAttributesfunc(*fiber.Ctx) []attribute.KeyValueDefine a function to add custom attributes to the span.nil
WithCollectClientIPboolSpecifies whether to collect the client's IP address from the request.true

Usage

Please refer to example

Example

package main

import (
"context"
"errors"
"log"

"go.opentelemetry.io/otel/sdk/resource"

"github.com/gofiber/fiber/v2"

"github.com/gofiber/contrib/otelfiber"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"

//"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
oteltrace "go.opentelemetry.io/otel/trace"
)

var tracer = otel.Tracer("fiber-server")

func main() {
tp := initTracer()
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()

app := fiber.New()

app.Use(otelfiber.Middleware())

app.Get("/error", func(ctx *fiber.Ctx) error {
return errors.New("abc")
})

app.Get("/users/:id", func(c *fiber.Ctx) error {
id := c.Params("id")
name := getUser(c.UserContext(), id)
return c.JSON(fiber.Map{"id": id, name: name})
})

log.Fatal(app.Listen(":3000"))
}

func initTracer() *sdktrace.TracerProvider {
exporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
log.Fatal(err)
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String("my-service"),
)),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return tp
}

func getUser(ctx context.Context, id string) string {
_, span := tracer.Start(ctx, "getUser", oteltrace.WithAttributes(attribute.String("id", id)))
defer span.End()
if id == "123" {
return "otelfiber tester"
}
return "unknown"
}