|
| 1 | +package testutil |
| 2 | + |
| 3 | +import ( |
| 4 | +"fmt" |
| 5 | +"reflect" |
| 6 | +"time" |
| 7 | +) |
| 8 | + |
| 9 | +typeRandomstruct { |
| 10 | +Stringfunc()string |
| 11 | +Boolfunc()bool |
| 12 | +Intfunc()int64 |
| 13 | +Uintfunc()uint64 |
| 14 | +Floatfunc()float64 |
| 15 | +Complexfunc()complex128 |
| 16 | +} |
| 17 | + |
| 18 | +funcNewRandom()*Random { |
| 19 | +// Guaranteed to be random... |
| 20 | +return&Random{ |
| 21 | +String:func()string {return"foo" }, |
| 22 | +Bool:func()bool {returntrue }, |
| 23 | +Int:func()int64 {return500 }, |
| 24 | +Uint:func()uint64 {return126 }, |
| 25 | +Float:func()float64 {return3.14 }, |
| 26 | +Complex:func()complex128 {return6.24 }, |
| 27 | +} |
| 28 | +} |
| 29 | + |
| 30 | +// PopulateStruct does a best effort to populate a struct with random values. |
| 31 | +funcPopulateStruct(sinterface{},r*Random)error { |
| 32 | +ifr==nil { |
| 33 | +r=NewRandom() |
| 34 | +} |
| 35 | + |
| 36 | +v:=reflect.ValueOf(s) |
| 37 | +ifv.Kind()!=reflect.Ptr||v.IsNil() { |
| 38 | +returnfmt.Errorf("s must be a non-nil pointer") |
| 39 | +} |
| 40 | + |
| 41 | +v=v.Elem() |
| 42 | +ifv.Kind()!=reflect.Struct { |
| 43 | +returnfmt.Errorf("s must be a pointer to a struct") |
| 44 | +} |
| 45 | + |
| 46 | +t:=v.Type() |
| 47 | +fori:=0;i<t.NumField();i++ { |
| 48 | +field:=t.Field(i) |
| 49 | +fieldName:=field.Name |
| 50 | + |
| 51 | +fieldValue:=v.Field(i) |
| 52 | +if!fieldValue.CanSet() { |
| 53 | +continue// Skip if field is unexported |
| 54 | +} |
| 55 | + |
| 56 | +nv,err:=populateValue(fieldValue,r) |
| 57 | +iferr!=nil { |
| 58 | +returnfmt.Errorf("%s : %w",fieldName,err) |
| 59 | +} |
| 60 | +v.Field(i).Set(nv) |
| 61 | +} |
| 62 | + |
| 63 | +returnnil |
| 64 | +} |
| 65 | + |
| 66 | +funcpopulateValue(v reflect.Value,r*Random) (reflect.Value,error) { |
| 67 | +varerrerror |
| 68 | + |
| 69 | +// Handle some special cases |
| 70 | +switchv.Type() { |
| 71 | +casereflect.TypeOf(time.Time{}): |
| 72 | +v.Set(reflect.ValueOf(time.Date(2020,5,2,5,19,21,30,time.UTC))) |
| 73 | +returnv,nil |
| 74 | +} |
| 75 | + |
| 76 | +switchv.Kind() { |
| 77 | +casereflect.Struct: |
| 78 | +iferr:=PopulateStruct(v.Addr().Interface(),r);err!=nil { |
| 79 | +returnv,err |
| 80 | +} |
| 81 | +casereflect.String: |
| 82 | +v.SetString(r.String()) |
| 83 | +casereflect.Bool: |
| 84 | +v.SetBool(true) |
| 85 | +casereflect.Int,reflect.Int8,reflect.Int16,reflect.Int32,reflect.Int64: |
| 86 | +v.SetInt(r.Int()) |
| 87 | +casereflect.Uint,reflect.Uint8,reflect.Uint16,reflect.Uint32,reflect.Uint64: |
| 88 | +v.SetUint(r.Uint()) |
| 89 | +casereflect.Float32,reflect.Float64: |
| 90 | +v.SetFloat(r.Float()) |
| 91 | +casereflect.Complex64,reflect.Complex128: |
| 92 | +v.SetComplex(r.Complex()) |
| 93 | +casereflect.Array: |
| 94 | +fori:=0;i<v.Len();i++ { |
| 95 | +nv,err:=populateValue(v.Index(i),r) |
| 96 | +iferr!=nil { |
| 97 | +returnv,fmt.Errorf("array index %d : %w",i,err) |
| 98 | +} |
| 99 | +v.Index(i).Set(nv) |
| 100 | +} |
| 101 | +casereflect.Map: |
| 102 | +m:=reflect.MakeMap(v.Type()) |
| 103 | + |
| 104 | +// Set a value in the map |
| 105 | +k:=reflect.New(v.Type().Key()) |
| 106 | +kv:=reflect.New(v.Type().Elem()) |
| 107 | +k,err=populateValue(k,r) |
| 108 | +iferr!=nil { |
| 109 | +returnv,fmt.Errorf("map key : %w",err) |
| 110 | +} |
| 111 | +kv,err=populateValue(kv,r) |
| 112 | +iferr!=nil { |
| 113 | +returnv,fmt.Errorf("map value : %w",err) |
| 114 | +} |
| 115 | + |
| 116 | +m.SetMapIndex(k,kv) |
| 117 | +returnm,nil |
| 118 | +casereflect.Pointer: |
| 119 | +returnpopulateValue(v.Elem(),r) |
| 120 | +casereflect.Slice: |
| 121 | +s:=reflect.MakeSlice(v.Type(),2,2) |
| 122 | +sv,err:=populateValue(reflect.New(v.Type().Elem()),r) |
| 123 | +iferr!=nil { |
| 124 | +returnv,fmt.Errorf("slice value : %w",err) |
| 125 | +} |
| 126 | + |
| 127 | +s.Index(0).Set(sv) |
| 128 | +s.Index(1).Set(sv) |
| 129 | +//reflect.AppendSlice(s, sv) |
| 130 | + |
| 131 | +returns,nil |
| 132 | +casereflect.Uintptr,reflect.UnsafePointer,reflect.Chan,reflect.Func,reflect.Interface: |
| 133 | +// Unsupported |
| 134 | +returnv,fmt.Errorf("%s is not supported",v.Kind()) |
| 135 | +default: |
| 136 | +returnv,fmt.Errorf("unsupported kind %s",v.Kind()) |
| 137 | +} |
| 138 | +returnv,nil |
| 139 | +} |