utils.go

// Copyright 2019 Martin Holst Swende
// This file is part of the goevmlab library.
//
// The library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the goevmlab library. If not, see <http://www.gnu.org/licenses/>.

package program

import (
	"flag"
	"fmt"
	"os"
	"runtime/pprof"
)

var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")

// RunProgram parses flags (for profiling), and executes teh testFn
func RunProgram(testFn func() error) error {
	flag.Parse()
	if *cpuprofile != "" {
		f, err := os.Create(*cpuprofile)
		if err != nil {
			return fmt.Errorf("could not create CPU profile: %v", err)
		}
		defer f.Close()
		if err := pprof.StartCPUProfile(f); err != nil {
			return fmt.Errorf("could not start CPU profile: %v ", err)
		}
		defer pprof.StopCPUProfile()
	}
	return testFn()
}