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//go:build debug || debugenv
// +build debug debugenv
package debug
import (
"net/http"
"net/http/pprof"
"strings"
)
// ServePprof will start an HTTP server serving /debug/pprof only if debug enabled.
func ServePprof(addr string) error {
if !DEBUG {
// debug disabled in env
return nil
}
handler := WithPprof(nil)
return http.ListenAndServe(addr, handler)
}
// WithPprof will add /debug/pprof handling (provided by "net/http/pprof") only if debug enabled.
func WithPprof(handler http.Handler) http.Handler {
if !DEBUG {
// debug disabled in env
return handler
}
// Default serve mux is setup with pprof
pprofmux := http.DefaultServeMux
if pprofmux == nil {
// Someone nil'ed the default mux
pprofmux = &http.ServeMux{}
pprofmux.HandleFunc("/debug/pprof/", pprof.Index)
pprofmux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
pprofmux.HandleFunc("/debug/pprof/profile", pprof.Profile)
pprofmux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
pprofmux.HandleFunc("/debug/pprof/trace", pprof.Trace)
}
if handler == nil {
// Ensure handler is non-nil
handler = http.NotFoundHandler()
}
// Debug enabled, return wrapped handler func
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
const prefix = "/debug/pprof"
// /debug/pprof(/.*)? -> pass to pprofmux
if strings.HasPrefix(r.URL.Path, prefix) {
path := r.URL.Path[len(prefix):]
if path == "" || path[0] == '/' {
pprofmux.ServeHTTP(rw, r)
return
}
}
// .* -> pass to handler
handler.ServeHTTP(rw, r)
})
}
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