README.md

Fiber OpenTelemetry

OpenTelemetry trace middleware for Fiber that adds traces to requests.

Table of Contents

• Signatures
• Examples
• Config
• Default Config

Signatures

func New(config ...Config) fiber.Handler

Examples

Import the middleware package that is part of the Fiber web framework

import (
    "github.com/gofiber/fiber/v2"
    "go.opentelemetry.io/otel/api/trace"
    "go.opentelemetry.io/otel/label"
    fiberOpentelemetry "github.com/psmarcin/fiber-opentelemetry"
)

After you initiate your Fiber app, you can use the following possibilities:

// Default middleware config
tracer := trace.NoopTracerProvider().Tracer("test")
app.Use(fiberOpentelemetry.New(fiberOpentelemetry.Config{
    Tracer: trace,
}))

app.Get("/", func(ctx *fiber.Ctx) error {
    c := fiber_opentelemetry.FromCtx(ctx)
    
    ctx, span := tracer.Start(ctx, "trace-name")
    defer span.End()
    
    // attribute
    span.SetAttributes(label.String("attribute-name", "123"))
	
    // error
    span.RecordError(ctx, err)
    
    // event
    span.AddEvent(ctx, "event-name")
})

Config

// Config defines the config for middleware.
type Config struct {
    Tracer                trace.Tracer
    TracerStartAttributes []trace.SpanStartOption
    SpanName              string
    LocalKeyName          string
}

Default Config

var ConfigDefault = Config{
    SpanName:     "http/request",
    LocalKeyName: LocalsCtxKey,
    TracerStartAttributes: []trace.SpanStartOption{
        trace.WithSpanKind(trace.SpanKindServer),
        trace.WithNewRoot(),
        trace.WithRecord(),
    },
}