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// Copyright 2013 bee authors
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package main
import (
// Go is a basic promise implementation: it wraps calls a function in a goroutine
// and returns a channel which will later return the function's return value.
func Go(f func() error) chan error {
ch := make(chan error)
go func() {
ch <- f()
return ch
// if os.env DEBUG set, debug is on
func Debugf(format string, a ...interface{}) {
if os.Getenv("DEBUG") != "" {
_, file, line, ok := runtime.Caller(1)
if !ok {
file = "<unknown>"
line = -1
} else {
file = filepath.Base(file)
fmt.Fprintf(os.Stderr, fmt.Sprintf("[debug] %s:%d %s\n", file, line, format), a...)