gotosocial/vendor/codeberg.org/gruf/go-debug/pprof_on.go
kim 69011d4901
Add support for running profiling when debug build-tags provided (#491)
* wrap root HTTP handler in debug.WithPprof(), rearrange router.Start() to support this
* remove unused code
* set debug buildtag in build script when $DEBUG set
* update go-debug version with fixed handler
* use clone of router.srv for LE cert manager, reset server timeouts in debug
* add kim's other libraries to README
2022-04-28 13:32:53 +01:00

64 lines
1.5 KiB
Go

//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)
})
}