├── .gitignore ├── CONTRIBUTING.md ├── LICENSE ├── README.md ├── grace.go ├── grace_test.go ├── handler.go ├── handler_test.go ├── multiple.go ├── multiple_test.go ├── recover.go └── recover_test.go /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, build with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | # OS 15 | .DS_Store 16 | 17 | # IDE 18 | .idea 19 | .realize 20 | -------------------------------------------------------------------------------- /CONTRIBUTING.md: -------------------------------------------------------------------------------- 1 | # Contributing to Grace 2 | 3 | :+1: First off, thanks for taking the time to contribute! :+1: 4 | 5 | The following is a set of guidelines for contributing to this node package. These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request. 6 | 7 | #### Table Of Contents 8 | 9 | [Code of Conduct](#code-of-conduct) 10 | 11 | [How Can I Contribute?](#how-can-i-contribute) 12 | 13 | ## Code of Conduct 14 | This project and everyone participating in it is governed by following best pratices: 15 | 16 | * Using welcoming and inclusive language 17 | * Being respectful of differing viewpoints and experiences 18 | * Gracefully accepting constructive criticism 19 | * Focusing on what is best for the community 20 | * Showing empathy towards other community members 21 | 22 | Examples of unacceptable behavior by participants include: 23 | 24 | * The use of sexualized language or imagery and unwelcome sexual attention or advances 25 | * Trolling, insulting/derogatory comments, and personal or political attacks 26 | * Public or private harassment 27 | * Publishing others' private information, such as a physical or electronic address, without explicit permission 28 | * Other conduct which could reasonably be considered inappropriate in a professional setting 29 | 30 | By participating, you are expected to uphold this code. Please report unacceptable behavior. 31 | 32 | ## How Can I Contribute? 33 | * Report Bugs 34 | * Suggest Features 35 | * Make Pull Requests 36 | * Give a star :star: to the project 37 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 |

2 | 3 |

4 |

5 | Build status 6 | GoReport 7 | GoDoc 8 | License 9 | Gitter 10 |

11 |
12 |

Handle recover, panic and errors in a graceful way

13 |
14 | 15 | ## Quickstart 16 | 17 | ``` 18 | go get github.com/oxequa/grace 19 | ``` 20 | 21 | The following is a simple example that handles a panic and returns the error without the program crash. 22 | 23 | ```go 24 | package main 25 | 26 | import ( 27 | "fmt" 28 | "github.com/oxequa/grace" 29 | ) 30 | 31 | func example() (e error){ 32 | defer grace.Recover(&e) // save recover error and stack trace to e 33 | numbers := []int{1, 2} 34 | fmt.Println(numbers[3]) // panic out of index 35 | return 36 | } 37 | 38 | func main() { 39 | err := example() // no panic occur 40 | fmt.Println(err) 41 | fmt.Println("End") 42 | } 43 | ``` 44 | 45 | ## Documentation 46 | 47 | You can read the full documentation of Grace [here](https://grace.oxequa.com). 48 | 49 | ## Contributing 50 | 51 | Please read our guideline [here](CONTRIBUTING.md). 52 | 53 | ## License 54 | 55 | Grace is licensed under the [GNU GENERAL PUBLIC LICENSE V3](LICENSE). 56 | -------------------------------------------------------------------------------- /grace.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | import ( 4 | "errors" 5 | "fmt" 6 | ) 7 | 8 | type grace struct { 9 | errors []error 10 | handlers []HandlerFunc 11 | } 12 | 13 | // Return error value 14 | func (g *grace) Error() string { 15 | if len(g.errors) > 0 { 16 | return g.errors[len(g.errors)-1].Error() 17 | } 18 | return "" 19 | } 20 | 21 | // Empty check if error message is an empty string. 22 | func Empty(e error) bool { 23 | if e != nil { 24 | if e.Error() == "" { 25 | return true 26 | } 27 | return false 28 | } 29 | return true 30 | } 31 | 32 | // New return an error created on the base of a given interface. 33 | func New(v ...interface{}) error { 34 | g := &grace{} 35 | g.errors = append(g.errors, errors.New(fmt.Sprint(v...))) 36 | return g 37 | } 38 | 39 | // Equal check if two errors are equal. 40 | func Equal(e1 error, e2 error) bool { 41 | if e1.Error() == e2.Error() { 42 | return true 43 | } 44 | return false 45 | } 46 | 47 | // Def if error is nil return a new error with the interface as error value. 48 | func Def(e error, v ...interface{}) error { 49 | if Empty(e) { 50 | return New(v...) 51 | } 52 | return e 53 | } 54 | 55 | // Set if error is not nil return a new error with the interface as error value. 56 | func Set(e error, v ...interface{}) error { 57 | if !Empty(e) { 58 | return New(v...) 59 | } 60 | return e 61 | } 62 | 63 | // Prefix an error with one or a list of custom value. 64 | func Prefix(e error, p ...interface{}) error { 65 | switch err := e.(type) { 66 | case *grace: 67 | for i, elm := range err.errors { 68 | err.errors[i] = New(fmt.Sprint(p...), elm.Error()) 69 | } 70 | return e 71 | } 72 | return New(fmt.Sprint(p...), e.Error()) 73 | } 74 | -------------------------------------------------------------------------------- /grace_test.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | import ( 4 | "strconv" 5 | "strings" 6 | "testing" 7 | "time" 8 | ) 9 | 10 | type test struct { 11 | s string 12 | i int 13 | t time.Duration 14 | } 15 | 16 | func TestDef(t *testing.T) { 17 | err := error(nil) 18 | result := Def(err, "test") 19 | if result.Error() != "test" { 20 | t.Fatal("Unexpected error") 21 | } 22 | err = New("") 23 | result = Def(err, "test") 24 | if result.Error() != "test" { 25 | t.Fatal("Unexpected error") 26 | } 27 | err = New("ok") 28 | result = Def(err, "test") 29 | if result.Error() == "test" { 30 | t.Fatal("Unexpected error") 31 | } 32 | } 33 | 34 | func TestSet(t *testing.T) { 35 | err := error(nil) 36 | result := Set(err, "test") 37 | if result != nil { 38 | t.Fatal("Unexpected error") 39 | } 40 | err = New("") 41 | result = Set(err, "test") 42 | if result.Error() == "test" { 43 | t.Fatal("Unexpected error") 44 | } 45 | err = New("test1") 46 | result = Set(err, "test") 47 | if result.Error() != "test" { 48 | t.Fatal("Unexpected error") 49 | } 50 | } 51 | 52 | func TestNew(t *testing.T) { 53 | // string 54 | s := "test" 55 | err := New(s) 56 | if err.Error() != s { 57 | t.Fatal("Unexpected error", err.Error(), "instead", s) 58 | } 59 | // int 60 | i := 10 61 | err = New(i) 62 | if err.Error() != strconv.Itoa(i) { 63 | t.Fatal("Unexpected error", err.Error(), "instead", strconv.Itoa(i)) 64 | } 65 | // interface 66 | str := test{ 67 | s: "test", 68 | i: 10, 69 | t: time.Duration(1), 70 | } 71 | int := 100 72 | err = New(int, str) 73 | if !strings.Contains(err.Error(), strconv.Itoa(i)) { 74 | t.Fatal("Unexpected error", err.Error(), "should contains", strconv.Itoa(i)) 75 | } 76 | if !strings.Contains(err.Error(), s) { 77 | t.Fatal("Unexpected error", err.Error(), "should contains", strconv.Itoa(i)) 78 | } 79 | } 80 | 81 | func TestEmpty(t *testing.T) { 82 | err := error(nil) 83 | result := Empty(err) 84 | if !result { 85 | t.Fatal("Unexpected error") 86 | } 87 | err = New("") 88 | if !result { 89 | t.Fatal("Unexpected error") 90 | } 91 | } 92 | 93 | func TestEqual(t *testing.T) { 94 | err1 := New("test") 95 | err2 := New("test1") 96 | if Equal(err1, err2) { 97 | t.Fatal("Unexpected error", err1, err2) 98 | } 99 | err2 = New("test") 100 | if !Equal(err1, err2) { 101 | t.Fatal("Unexpected error", err1, err2) 102 | } 103 | } 104 | 105 | func TestPrefix(t *testing.T) { 106 | prefix := "pre" 107 | error := New("test") 108 | result := Prefix(error, prefix) 109 | if !strings.Contains(result.Error(), "pre") { 110 | t.Fatal("Unexpected error") 111 | } 112 | 113 | error = New("test") 114 | error = Multi(error).Add(New("test1")) 115 | result = Prefix(error, prefix) 116 | list := Multi(result).Get() 117 | if len(list) <= 1 { 118 | t.Fatal("Unexpected len erors list", list) 119 | } 120 | for _, e := range list { 121 | if !strings.Contains(e.Error(), "pre") { 122 | t.Fatal("Unexpected error", e.Error()) 123 | } 124 | } 125 | } 126 | 127 | func TestGrace_Error(t *testing.T) { 128 | err := New("test") 129 | if err.Error() != "test" { 130 | t.Fatal("Unexpected error", err) 131 | } 132 | err = Multi(err).Add(New("test1")) 133 | if err.Error() != "test1" { 134 | t.Fatal("Unexpected error", err) 135 | } 136 | 137 | } 138 | -------------------------------------------------------------------------------- /handler.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | type Handlers struct { 4 | err error 5 | } 6 | 7 | type HandlerFunc func(error) error 8 | 9 | func Handler(e error) *Handlers { 10 | h := Handlers{e} 11 | if e == nil { 12 | h.err = &grace{} 13 | } 14 | return &h 15 | } 16 | 17 | // Loop a list of handlers on an error or multiple error. 18 | func (h *Handlers) Loop() error { 19 | switch err := h.err.(type) { 20 | case *grace: 21 | for index := range err.errors { 22 | for _, elmH := range err.handlers { 23 | err.errors[index] = elmH(err.errors[index]) 24 | } 25 | } 26 | } 27 | return h.err 28 | } 29 | 30 | // Get a list of existing handler func 31 | func (h *Handlers) Get() []HandlerFunc { 32 | switch err := h.err.(type) { 33 | case *grace: 34 | return err.handlers 35 | } 36 | return nil 37 | } 38 | 39 | // Add a list of handlers to a new error. 40 | func (h *Handlers) Add(f ...HandlerFunc) error { 41 | switch err := h.err.(type) { 42 | case *grace: 43 | err.handlers = append(err.handlers, f...) 44 | return h.err 45 | default: 46 | g := grace{} 47 | if h.err != nil { 48 | g.errors = append(g.errors, h.err) 49 | } 50 | g.handlers = append(g.handlers, f...) 51 | return &g 52 | } 53 | } 54 | -------------------------------------------------------------------------------- /handler_test.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | import ( 4 | "bytes" 5 | "log" 6 | "testing" 7 | ) 8 | 9 | func TestHandler(t *testing.T) { 10 | result := Handler(error(nil)) 11 | if result == nil { 12 | t.Fatal("Unexpected error") 13 | } 14 | result = Handler(New("test")) 15 | if result == nil { 16 | t.Fatal("Unexpected error") 17 | } 18 | } 19 | 20 | func TestHandlers_Add(t *testing.T) { 21 | err := New("test") 22 | err = Handler(err).Add(func(e error) error { 23 | return e 24 | }) 25 | if len(Handler(err).Get()) != 1 { 26 | t.Fatal("Unexpected num of handlers") 27 | } 28 | err = Handler(err).Add(func(e error) error { 29 | return e 30 | }, func(e error) error { 31 | return e 32 | }) 33 | if len(Handler(err).Get()) != 3 { 34 | t.Fatal("Unexpected num of handlers") 35 | } 36 | } 37 | 38 | func TestHandlers_Get(t *testing.T) { 39 | err := &grace{ 40 | handlers: []HandlerFunc{ 41 | func(e error) error { 42 | return e 43 | }, 44 | }, 45 | } 46 | if len(Handler(err).Get()) != 1 { 47 | t.Fatal("Unexpected num of handlers") 48 | } 49 | } 50 | 51 | func TestHandlers_Loop(t *testing.T) { 52 | var buf bytes.Buffer 53 | log.SetOutput(&buf) 54 | 55 | err := &grace{ 56 | handlers: []HandlerFunc{ 57 | func(e error) error { 58 | log.Println(e) 59 | return e 60 | }, 61 | }, 62 | } 63 | Handler(err).Loop() 64 | if len(buf.Bytes()) != 0 { 65 | t.Fatal("Unexpected error") 66 | } 67 | 68 | err = &grace{ 69 | handlers: []HandlerFunc{ 70 | func(e error) error { 71 | log.Println(e) 72 | return e 73 | }, 74 | }, 75 | errors: []error{ 76 | New("test"), 77 | }, 78 | } 79 | Handler(err).Loop() 80 | if len(buf.Bytes()) <= 0 { 81 | t.Fatal("Unexpected error") 82 | } 83 | } 84 | -------------------------------------------------------------------------------- /multiple.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | type Multiple struct { 4 | err *error 5 | } 6 | 7 | func Multi(e error) *Multiple { 8 | m := Multiple{&e} 9 | if e == nil { 10 | *m.err = &grace{} 11 | } 12 | return &m 13 | } 14 | 15 | // Errors return a list of errors if exist. 16 | func (m *Multiple) Get() []error { 17 | if m.err != nil { 18 | switch err := (*m.err).(type) { 19 | case *grace: 20 | return err.errors 21 | default: 22 | return []error{err} 23 | } 24 | } 25 | return []error{} 26 | } 27 | 28 | // Append multiple errors to only one. 29 | func (m *Multiple) Add(elems ...error) error { 30 | if m.err != nil { 31 | switch err := (*m.err).(type) { 32 | case *grace: 33 | err.errors = append(err.errors, elems...) 34 | return *m.err 35 | default: 36 | new := grace{} 37 | new.errors = append(new.errors, elems...) 38 | return &new 39 | } 40 | } 41 | return nil 42 | } 43 | -------------------------------------------------------------------------------- /multiple_test.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | import "testing" 4 | 5 | func TestMulti(t *testing.T) { 6 | result := Multi(error(nil)) 7 | if result == nil { 8 | t.Fatal("Unexpected error") 9 | } 10 | result = Multi(New("test")) 11 | if result == nil { 12 | t.Fatal("Unexpected error") 13 | } 14 | } 15 | 16 | func TestMultiple_Add(t *testing.T) { 17 | err := New("test") 18 | err = Multi(err).Add(New("test"), New("test1")) 19 | if l := len(Multi(err).Get()); l != 3 { 20 | t.Fatal("Unexpected lenght", l) 21 | } 22 | } 23 | 24 | func TestMultiple_Get(t *testing.T) { 25 | err := &grace{ 26 | errors: []error{New("test"), New("test")}, 27 | } 28 | if l := len(Multi(err).Get()); l != 2 { 29 | t.Fatal("Unexpected lenght", l) 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /recover.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | import ( 4 | "runtime/debug" 5 | ) 6 | 7 | type Recovery struct { 8 | err *error 9 | value string 10 | stack []byte 11 | } 12 | 13 | // Error set the error pointer to error message only 14 | func (rc *Recovery) Error() { 15 | if r := recover(); r != nil { 16 | switch err := (*rc.err).(type) { 17 | case *grace: 18 | g := &grace{ 19 | handlers: err.handlers, 20 | errors: []error{New(r)}, 21 | } 22 | err.errors = append(err.errors, Handler(g).Loop()) 23 | default: 24 | *rc.err = &grace{errors: []error{New(r)}} 25 | } 26 | } 27 | } 28 | 29 | // Stack set the error pointer to stack trace only 30 | func (rc *Recovery) Stack() { 31 | if r := recover(); r != nil { 32 | switch err := (*rc.err).(type) { 33 | case *grace: 34 | g := &grace{ 35 | handlers: err.handlers, 36 | errors: []error{New(string(debug.Stack()))}, 37 | } 38 | err.errors = append(err.errors, Handler(g).Loop()) 39 | default: 40 | *rc.err = &grace{errors: []error{New(string(debug.Stack()))}} 41 | } 42 | } 43 | } 44 | 45 | // Recover set an error pointer to recover error with stack trace. 46 | func Recover(e *error) *Recovery { 47 | if r := recover(); r != nil { 48 | switch err := (*e).(type) { 49 | case *grace: 50 | g := &grace{ 51 | handlers: err.handlers, 52 | errors: []error{New(r, string(debug.Stack()))}, 53 | } 54 | err.errors = append(err.errors, Handler(g).Loop()) 55 | default: 56 | *e = &grace{errors: []error{New(r, string(debug.Stack()))}} 57 | } 58 | } 59 | return &Recovery{ 60 | err: e, 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /recover_test.go: -------------------------------------------------------------------------------- 1 | package grace 2 | 3 | import ( 4 | "bytes" 5 | "fmt" 6 | "log" 7 | "strings" 8 | "testing" 9 | ) 10 | 11 | func TestRecover(t *testing.T) { 12 | var buf bytes.Buffer 13 | log.SetOutput(&buf) 14 | 15 | err := func() (e error) { 16 | defer Recover(&e) 17 | numbers := []int{1, 2} 18 | fmt.Println(numbers[3]) 19 | return e 20 | }() 21 | length := len(strings.Split(strings.TrimSuffix(err.Error(), "\n"), "\n")) 22 | if err == nil || length <= 1 { 23 | t.Fatal("Unexpected error") 24 | } 25 | 26 | // add a custom function 27 | err = func() (e error) { 28 | e = Handler(e).Add(func(e error) error { 29 | log.Println(e) 30 | return e 31 | }) 32 | defer Recover(&e) 33 | numbers := []int{1, 2} 34 | fmt.Println(numbers[3]) 35 | return 36 | }() 37 | length = len(strings.Split(strings.TrimSuffix(err.Error(), "\n"), "\n")) 38 | if err == nil || length <= 1 || len(buf.Bytes()) <= 0 { 39 | t.Fatal("Unexpected error", length, len(buf.Bytes())) 40 | } 41 | } 42 | 43 | func TestRecovery_Error(t *testing.T) { 44 | var buf bytes.Buffer 45 | log.SetOutput(&buf) 46 | // get only error message 47 | err := func() (e error) { 48 | e = Handler(e).Add(func(e error) error { 49 | log.Println(e) 50 | return e 51 | }) 52 | defer Recover(&e).Error() 53 | numbers := []int{1, 2} 54 | fmt.Println(numbers[3]) 55 | return 56 | }() 57 | length := len(strings.Split(strings.TrimSuffix(err.Error(), "\n"), "\n")) 58 | if err == nil || length != 1 || len(buf.Bytes()) <= 0 { 59 | t.Fatal("Unexpected error", err, length) 60 | } 61 | } 62 | 63 | func TestRecovery_Stack(t *testing.T) { 64 | var buf bytes.Buffer 65 | log.SetOutput(&buf) 66 | // get only error message 67 | err := func() (e error) { 68 | e = Handler(e).Add(func(e error) error { 69 | log.Println(e) 70 | return e 71 | }) 72 | defer Recover(&e).Stack() 73 | numbers := []int{1, 2} 74 | fmt.Println(numbers[3]) 75 | return 76 | }() 77 | length := len(strings.Split(strings.TrimSuffix(err.Error(), "\n"), "\n")) 78 | if err == nil || length <= 1 || len(buf.Bytes()) <= 0 { 79 | t.Fatal("Unexpected error", err, length) 80 | } 81 | } 82 | --------------------------------------------------------------------------------