84 lines
2.4 KiB
Go
84 lines
2.4 KiB
Go
/*
|
|
* Copyright 2017 Dgraph Labs, Inc. and Contributors
|
|
*
|
|
* 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
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* 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 y
|
|
|
|
// This file contains some functions for error handling. Note that we are moving
|
|
// towards using x.Trace, i.e., rpc tracing using net/tracer. But for now, these
|
|
// functions are useful for simple checks logged on one machine.
|
|
// Some common use cases are:
|
|
// (1) You receive an error from external lib, and would like to check/log fatal.
|
|
// For this, use x.Check, x.Checkf. These will check for err != nil, which is
|
|
// more common in Go. If you want to check for boolean being true, use
|
|
// x.Assert, x.Assertf.
|
|
// (2) You receive an error from external lib, and would like to pass on with some
|
|
// stack trace information. In this case, use x.Wrap or x.Wrapf.
|
|
// (3) You want to generate a new error with stack trace info. Use x.Errorf.
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
var debugMode = true
|
|
|
|
// Check logs fatal if err != nil.
|
|
func Check(err error) {
|
|
if err != nil {
|
|
log.Fatalf("%+v", Wrap(err))
|
|
}
|
|
}
|
|
|
|
// Check2 acts as convenience wrapper around Check, using the 2nd argument as error.
|
|
func Check2(_ interface{}, err error) {
|
|
Check(err)
|
|
}
|
|
|
|
// AssertTrue asserts that b is true. Otherwise, it would log fatal.
|
|
func AssertTrue(b bool) {
|
|
if !b {
|
|
log.Fatalf("%+v", errors.Errorf("Assert failed"))
|
|
}
|
|
}
|
|
|
|
// AssertTruef is AssertTrue with extra info.
|
|
func AssertTruef(b bool, format string, args ...interface{}) {
|
|
if !b {
|
|
log.Fatalf("%+v", errors.Errorf(format, args...))
|
|
}
|
|
}
|
|
|
|
// Wrap wraps errors from external lib.
|
|
func Wrap(err error) error {
|
|
if !debugMode {
|
|
return err
|
|
}
|
|
return errors.Wrap(err, "")
|
|
}
|
|
|
|
// Wrapf is Wrap with extra info.
|
|
func Wrapf(err error, format string, args ...interface{}) error {
|
|
if !debugMode {
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
return fmt.Errorf(format+" error: %+v", append(args, err)...)
|
|
}
|
|
return errors.Wrapf(err, format, args...)
|
|
}
|