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83 lines
2.4 KiB
83 lines
2.4 KiB
/* |
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* Copyright 2017 Dgraph Labs, Inc. and Contributors |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package y |
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// This file contains some functions for error handling. Note that we are moving |
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// towards using x.Trace, i.e., rpc tracing using net/tracer. But for now, these |
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// functions are useful for simple checks logged on one machine. |
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// Some common use cases are: |
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// (1) You receive an error from external lib, and would like to check/log fatal. |
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// For this, use x.Check, x.Checkf. These will check for err != nil, which is |
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// more common in Go. If you want to check for boolean being true, use |
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// x.Assert, x.Assertf. |
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// (2) You receive an error from external lib, and would like to pass on with some |
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// stack trace information. In this case, use x.Wrap or x.Wrapf. |
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// (3) You want to generate a new error with stack trace info. Use x.Errorf. |
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import ( |
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"fmt" |
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"log" |
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"github.com/pkg/errors" |
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) |
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var debugMode = true |
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// Check logs fatal if err != nil. |
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func Check(err error) { |
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if err != nil { |
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log.Fatalf("%+v", Wrap(err)) |
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} |
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} |
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// Check2 acts as convenience wrapper around Check, using the 2nd argument as error. |
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func Check2(_ interface{}, err error) { |
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Check(err) |
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} |
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// AssertTrue asserts that b is true. Otherwise, it would log fatal. |
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func AssertTrue(b bool) { |
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if !b { |
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log.Fatalf("%+v", errors.Errorf("Assert failed")) |
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} |
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} |
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// AssertTruef is AssertTrue with extra info. |
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func AssertTruef(b bool, format string, args ...interface{}) { |
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if !b { |
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log.Fatalf("%+v", errors.Errorf(format, args...)) |
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} |
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} |
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// Wrap wraps errors from external lib. |
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func Wrap(err error) error { |
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if !debugMode { |
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return err |
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} |
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return errors.Wrap(err, "") |
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} |
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// Wrapf is Wrap with extra info. |
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func Wrapf(err error, format string, args ...interface{}) error { |
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if !debugMode { |
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if err == nil { |
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return nil |
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} |
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return fmt.Errorf(format+" error: %+v", append(args, err)...) |
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} |
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return errors.Wrapf(err, format, args...) |
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}
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