mux

Documentation

Overview

Package mux provides tracing functions for tracing the gorilla/mux package (https://github.com/gorilla/mux).

Example

package main

import (
	"net/http"

	muxtrace "gopkg.in/flocasts/dd-trace-go.v1/contrib/gorilla/mux"
)

func handler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello World!\n"))
}

func main() {
	mux := muxtrace.NewRouter()
	mux.HandleFunc("/", handler)
	http.ListenAndServe(":8080", mux)
}

Example (WithServiceName)

package main

import (
	"net/http"

	muxtrace "gopkg.in/flocasts/dd-trace-go.v1/contrib/gorilla/mux"
)

func handler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello World!\n"))
}

func main() {
	mux := muxtrace.NewRouter(muxtrace.WithServiceName("mux.route"))
	mux.HandleFunc("/", handler)
	http.ListenAndServe(":8080", mux)
}

Index

• type Router
  • func NewRouter(opts ...RouterOption) *Router
  • func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request)
  • func (r *Router) SkipClean(value bool) *Router
  • func (r *Router) StrictSlash(value bool) *Router
  • func (r *Router) UseEncodedPath() *Router
• type RouterOption
  • func NoDebugStack() RouterOption
  • func WithAnalytics(on bool) RouterOption
  • func WithAnalyticsRate(rate float64) RouterOption
  • func WithHeaderTags() RouterOption
  • func WithIgnoreRequest(f func(*http.Request) bool) RouterOption
  • func WithQueryParams() RouterOption
  • func WithResourceNamer(namer func(router *Router, req *http.Request) string) RouterOption
  • func WithServiceName(name string) RouterOption
  • func WithSpanOptions(opts ...ddtrace.StartSpanOption) RouterOption

Examples

• Package
• Package (WithServiceName)

Types

type Router

type Router struct {
	*mux.Router
	// contains filtered or unexported fields
}

Router registers routes to be matched and dispatches a handler.

func NewRouter

func NewRouter(opts ...RouterOption) *Router

NewRouter returns a new router instance traced with the global tracer.

func (*Router) ServeHTTP

func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request)

ServeHTTP dispatches the request to the handler whose pattern most closely matches the request URL. We only need to rewrite this function to be able to trace all the incoming requests to the underlying multiplexer

func (*Router) SkipClean

func (r *Router) SkipClean(value bool) *Router

SkipClean defines the path cleaning behaviour for new routes. The initial value is false. Users should be careful about which routes are not cleaned

When true, if the route path is "/path//to", it will remain with the double slash. This is helpful if you have a route like: /fetch/http://xkcd.com/534/

When false, the path will be cleaned, so /fetch/http://xkcd.com/534/ will become /fetch/http/xkcd.com/534

func (*Router) StrictSlash

func (r *Router) StrictSlash(value bool) *Router

StrictSlash defines the trailing slash behavior for new routes. The initial value is false.

When true, if the route path is "/path/", accessing "/path" will perform a redirect to the former and vice versa. In other words, your application will always see the path as specified in the route.

When false, if the route path is "/path", accessing "/path/" will not match this route and vice versa.

The re-direct is a HTTP 301 (Moved Permanently). Note that when this is set for routes with a non-idempotent method (e.g. POST, PUT), the subsequent re-directed request will be made as a GET by most clients. Use middleware or client settings to modify this behaviour as needed.

Special case: when a route sets a path prefix using the PathPrefix() method, strict slash is ignored for that route because the redirect behavior can't be determined from a prefix alone. However, any subrouters created from that route inherit the original StrictSlash setting.

func (*Router) UseEncodedPath

func (r *Router) UseEncodedPath() *Router

UseEncodedPath tells the router to match the encoded original path to the routes. For eg. "/path/foo%2Fbar/to" will match the path "/path/{var}/to".

If not called, the router will match the unencoded path to the routes. For eg. "/path/foo%2Fbar/to" will match the path "/path/foo/bar/to"

type RouterOption

type RouterOption func(*routerConfig)

RouterOption represents an option that can be passed to NewRouter.

func NoDebugStack

func NoDebugStack() RouterOption

NoDebugStack prevents stack traces from being attached to spans finishing with an error. This is useful in situations where errors are frequent and performance is critical.

func WithAnalytics

func WithAnalytics(on bool) RouterOption

WithAnalytics enables Trace Analytics for all started spans.

func WithAnalyticsRate

func WithAnalyticsRate(rate float64) RouterOption

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

func WithHeaderTags

func WithHeaderTags() RouterOption

WithHeaderTags specifies that the integration should attach HTTP request headers as tags to spans. Warning: using this feature can risk exposing sensitive data such as authorisation tokens to Datadog.

func WithIgnoreRequest

func WithIgnoreRequest(f func(*http.Request) bool) RouterOption

WithIgnoreRequest holds the function to use for determining if the incoming HTTP request tracing should be skipped.

func WithQueryParams

func WithQueryParams() RouterOption

WithQueryParams specifies that the integration should attach request query parameters as APM tags. Warning: using this feature can risk exposing sensitive data such as authorisation tokens to Datadog.

func WithResourceNamer

func WithResourceNamer(namer func(router *Router, req *http.Request) string) RouterOption

WithResourceNamer specifies a quantizing function which will be used to obtain the resource name for a given request.

func WithServiceName

func WithServiceName(name string) RouterOption

WithServiceName sets the given service name for the router.

func WithSpanOptions

func WithSpanOptions(opts ...ddtrace.StartSpanOption) RouterOption

WithSpanOptions applies the given set of options to the spans started by the router.