Add pprofhandler, fix valyala#235

Similar to expvarhandler but for net/http/pprof

pprofhandler/pprof.go

@@ -0,0 +1,35 @@
+package pprofhandler
+
+import (
+	"net/http/pprof"
+	"strings"
+
+	"github.com/valyala/fasthttp"
+	"github.com/valyala/fasthttp/fasthttpadaptor"
+)
+
+var (
+	cmdline = fasthttpadaptor.NewFastHTTPHandlerFunc(pprof.Cmdline)
+	profile = fasthttpadaptor.NewFastHTTPHandlerFunc(pprof.Profile)
+	symbol  = fasthttpadaptor.NewFastHTTPHandlerFunc(pprof.Symbol)
+	trace   = fasthttpadaptor.NewFastHTTPHandlerFunc(pprof.Trace)
+	index   = fasthttpadaptor.NewFastHTTPHandlerFunc(pprof.Index)
+)
+
+// PprofHandler serves server runtime profiling data in the format expected by the pprof visualization tool.
+//
+// See https://golang.org/pkg/net/http/pprof/ for details.
+func PprofHandler(ctx *fasthttp.RequestCtx) {
+	ctx.Response.Header.Set("Content-Type", "text/html")
+	if strings.HasPrefix(string(ctx.Path()), "/debug/pprof/cmdline") {
+		cmdline(ctx)
+	} else if strings.HasPrefix(string(ctx.Path()), "/debug/pprof/profile") {
+		profile(ctx)
+	} else if strings.HasPrefix(string(ctx.Path()), "/debug/pprof/symbol") {
+		symbol(ctx)
+	} else if strings.HasPrefix(string(ctx.Path()), "/debug/pprof/trace") {
+		trace(ctx)
+	} else {
+		index(ctx)
+	}
+}