gin

Documentation

Overview

Package gin provides functions to trace the gin-gonic/gin package (https://github.com/gin-gonic/gin).

Example

To start tracing requests, add the trace middleware to your Gin router.

package main

import (
	gintrace "gopkg.in/CodapeWild/dd-trace-go.v1/contrib/gin-gonic/gin"

	"github.com/gin-gonic/gin"
)

func main() {
	// Create a gin.Engine
	r := gin.New()

	// Use the tracer middleware with your desired service name.
	r.Use(gintrace.Middleware("my-web-app"))

	// Set up some endpoints.
	r.GET("/hello", func(c *gin.Context) {
		c.String(200, "hello world!")
	})

	// And start gathering request traces.
	r.Run(":8080")
}

Example (SpanFromContext)

package main

import (
	gintrace "gopkg.in/CodapeWild/dd-trace-go.v1/contrib/gin-gonic/gin"
	"gopkg.in/CodapeWild/dd-trace-go.v1/ddtrace/tracer"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()
	r.Use(gintrace.Middleware("image-encoder"))
	r.GET("/image/encode", func(c *gin.Context) {
		ctx := c.Request.Context()
		// create a child span to track operation timing.
		encodeSpan, _ := tracer.StartSpanFromContext(ctx, "image.encode")
		// encode a image
		encodeSpan.Finish()

		c.String(200, "ok!")
	})

}

Index

• func HTML(c *gin.Context, code int, name string, obj interface{})
• func Middleware(service string, opts ...Option) gin.HandlerFunc
• type Option
  • func WithAnalytics(on bool) Option
  • func WithAnalyticsRate(rate float64) Option
  • func WithResourceNamer(namer func(c *gin.Context) string) Option

Examples

• Package
• Package (SpanFromContext)
• HTML

Functions

func HTML

func HTML(c *gin.Context, code int, name string, obj interface{})

HTML will trace the rendering of the template as a child of the span in the given context.

Example

package main

import (
	gintrace "gopkg.in/CodapeWild/dd-trace-go.v1/contrib/gin-gonic/gin"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()
	r.Use(gintrace.Middleware("my-web-app"))
	r.LoadHTMLGlob("templates/*")

	r.GET("/index", func(c *gin.Context) {
		// render the html and trace the execution time.
		gintrace.HTML(c, 200, "index.tmpl", gin.H{
			"title": "Main website",
		})
	})
}

func Middleware

func Middleware(service string, opts ...Option) gin.HandlerFunc

Middleware returns middleware that will trace incoming requests. If service is empty then the default service name will be used.

Types

type Option

type Option func(*config)

Option specifies instrumentation configuration options.

func WithAnalytics

func WithAnalytics(on bool) Option

WithAnalytics enables Trace Analytics for all started spans.

func WithAnalyticsRate

func WithAnalyticsRate(rate float64) Option

WithAnalyticsRate sets the sampling rate for Trace Analytics events correlated to started spans.

func WithResourceNamer

func WithResourceNamer(namer func(c *gin.Context) string) Option

WithResourceNamer specifies a function which will be used to obtain a resource name for a given gin request, using the request's context.