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