63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
// Package gin provides functions to trace the gin-gonic/gin package (https://github.com/gin-gonic/gin).
|
|
package gin // import "gopkg.in/DataDog/dd-trace-go.v1/contrib/gin-gonic/gin"
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
|
|
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
|
|
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
|
|
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
|
|
|
|
"github.com/gin-gonic/gin"
|
|
)
|
|
|
|
// Middleware returns middleware that will trace incoming requests.
|
|
// The last parameter is optional and can be used to pass a custom tracer.
|
|
func Middleware(service string) gin.HandlerFunc {
|
|
return func(c *gin.Context) {
|
|
resource := c.HandlerName()
|
|
opts := []ddtrace.StartSpanOption{
|
|
tracer.ServiceName(service),
|
|
tracer.ResourceName(resource),
|
|
tracer.SpanType(ext.SpanTypeWeb),
|
|
tracer.Tag(ext.HTTPMethod, c.Request.Method),
|
|
tracer.Tag(ext.HTTPURL, c.Request.URL.Path),
|
|
}
|
|
if spanctx, err := tracer.Extract(tracer.HTTPHeadersCarrier(c.Request.Header)); err == nil {
|
|
opts = append(opts, tracer.ChildOf(spanctx))
|
|
}
|
|
span, ctx := tracer.StartSpanFromContext(c.Request.Context(), "http.request", opts...)
|
|
defer span.Finish()
|
|
|
|
// pass the span through the request context
|
|
c.Request = c.Request.WithContext(ctx)
|
|
|
|
// serve the request to the next middleware
|
|
c.Next()
|
|
|
|
span.SetTag(ext.HTTPCode, strconv.Itoa(c.Writer.Status()))
|
|
|
|
if len(c.Errors) > 0 {
|
|
span.SetTag("gin.errors", c.Errors.String())
|
|
span.SetTag(ext.Error, c.Errors[0])
|
|
}
|
|
}
|
|
}
|
|
|
|
// HTML will trace the rendering of the template as a child of the span in the given context.
|
|
func HTML(c *gin.Context, code int, name string, obj interface{}) {
|
|
span, _ := tracer.StartSpanFromContext(c.Request.Context(), "gin.render.html")
|
|
span.SetTag("go.template", name)
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
err := fmt.Errorf("error rendering tmpl:%s: %s", name, r)
|
|
span.Finish(tracer.WithError(err))
|
|
panic(r)
|
|
} else {
|
|
span.Finish()
|
|
}
|
|
}()
|
|
c.HTML(code, name, obj)
|
|
}
|