/
list.go
460 lines (383 loc) · 13.4 KB
/
list.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
package basetypes
import (
"context"
"fmt"
"strings"
"github.com/hashicorp/terraform-plugin-go/tftypes"
"github.com/hashicorp/terraform-plugin-framework/attr"
"github.com/hashicorp/terraform-plugin-framework/attr/xattr"
"github.com/hashicorp/terraform-plugin-framework/diag"
"github.com/hashicorp/terraform-plugin-framework/internal/reflect"
"github.com/hashicorp/terraform-plugin-framework/path"
)
var (
_ ListTypable = ListType{}
_ ListValuable = &ListValue{}
)
// ListTypable extends attr.Type for list types.
// Implement this interface to create a custom ListType type.
type ListTypable interface {
attr.Type
// ValueFromList should convert the List to a ListValuable type.
ValueFromList(context.Context, ListValue) (ListValuable, diag.Diagnostics)
}
// ListValuable extends attr.Value for list value types.
// Implement this interface to create a custom List value type.
type ListValuable interface {
attr.Value
// ToListValue should convert the value type to a List.
ToListValue(ctx context.Context) (ListValue, diag.Diagnostics)
}
// ListType is an AttributeType representing a list of values. All values must
// be of the same type, which the provider must specify as the ElemType
// property.
type ListType struct {
ElemType attr.Type
}
// ElementType returns the attr.Type elements will be created from.
func (l ListType) ElementType() attr.Type {
return l.ElemType
}
// WithElementType returns a ListType that is identical to `l`, but with the
// element type set to `typ`.
func (l ListType) WithElementType(typ attr.Type) attr.TypeWithElementType {
return ListType{ElemType: typ}
}
// TerraformType returns the tftypes.Type that should be used to
// represent this type. This constrains what user input will be
// accepted and what kind of data can be set in state. The framework
// will use this to translate the AttributeType to something Terraform
// can understand.
func (l ListType) TerraformType(ctx context.Context) tftypes.Type {
return tftypes.List{
ElementType: l.ElemType.TerraformType(ctx),
}
}
// ValueFromTerraform returns an attr.Value given a tftypes.Value.
// This is meant to convert the tftypes.Value into a more convenient Go
// type for the provider to consume the data with.
func (l ListType) ValueFromTerraform(ctx context.Context, in tftypes.Value) (attr.Value, error) {
if in.Type() == nil {
return NewListNull(l.ElemType), nil
}
if !in.Type().Equal(l.TerraformType(ctx)) {
return nil, fmt.Errorf("can't use %s as value of List with ElementType %T, can only use %s values", in.String(), l.ElemType, l.ElemType.TerraformType(ctx).String())
}
if !in.IsKnown() {
return NewListUnknown(l.ElemType), nil
}
if in.IsNull() {
return NewListNull(l.ElemType), nil
}
val := []tftypes.Value{}
err := in.As(&val)
if err != nil {
return nil, err
}
elems := make([]attr.Value, 0, len(val))
for _, elem := range val {
av, err := l.ElemType.ValueFromTerraform(ctx, elem)
if err != nil {
return nil, err
}
elems = append(elems, av)
}
// ValueFromTerraform above on each element should make this safe.
// Otherwise, this will need to do some Diagnostics to error conversion.
return NewListValueMust(l.ElemType, elems), nil
}
// Equal returns true if `o` is also a ListType and has the same ElemType.
func (l ListType) Equal(o attr.Type) bool {
if l.ElemType == nil {
return false
}
other, ok := o.(ListType)
if !ok {
return false
}
return l.ElemType.Equal(other.ElemType)
}
// ApplyTerraform5AttributePathStep applies the given AttributePathStep to the
// list.
func (l ListType) ApplyTerraform5AttributePathStep(step tftypes.AttributePathStep) (interface{}, error) {
if _, ok := step.(tftypes.ElementKeyInt); !ok {
return nil, fmt.Errorf("cannot apply step %T to ListType", step)
}
return l.ElemType, nil
}
// String returns a human-friendly description of the ListType.
func (l ListType) String() string {
return "types.ListType[" + l.ElemType.String() + "]"
}
// Validate validates all elements of the list that are of type
// xattr.TypeWithValidate.
func (l ListType) Validate(ctx context.Context, in tftypes.Value, path path.Path) diag.Diagnostics {
var diags diag.Diagnostics
if in.Type() == nil {
return diags
}
if !in.Type().Is(tftypes.List{}) {
err := fmt.Errorf("expected List value, received %T with value: %v", in, in)
diags.AddAttributeError(
path,
"List Type Validation Error",
"An unexpected error was encountered trying to validate an attribute value. This is always an error in the provider. Please report the following to the provider developer:\n\n"+err.Error(),
)
return diags
}
if !in.IsKnown() || in.IsNull() {
return diags
}
var elems []tftypes.Value
if err := in.As(&elems); err != nil {
diags.AddAttributeError(
path,
"List Type Validation Error",
"An unexpected error was encountered trying to validate an attribute value. This is always an error in the provider. Please report the following to the provider developer:\n\n"+err.Error(),
)
return diags
}
validatableType, isValidatable := l.ElemType.(xattr.TypeWithValidate)
if !isValidatable {
return diags
}
for index, elem := range elems {
if !elem.IsFullyKnown() {
continue
}
diags = append(diags, validatableType.Validate(ctx, elem, path.AtListIndex(index))...)
}
return diags
}
// ValueType returns the Value type.
func (l ListType) ValueType(_ context.Context) attr.Value {
return ListValue{
elementType: l.ElemType,
}
}
// ValueFromList returns a ListValuable type given a List.
func (l ListType) ValueFromList(_ context.Context, list ListValue) (ListValuable, diag.Diagnostics) {
return list, nil
}
// NewListNull creates a List with a null value. Determine whether the value is
// null via the List type IsNull method.
func NewListNull(elementType attr.Type) ListValue {
return ListValue{
elementType: elementType,
state: attr.ValueStateNull,
}
}
// NewListUnknown creates a List with an unknown value. Determine whether the
// value is unknown via the List type IsUnknown method.
func NewListUnknown(elementType attr.Type) ListValue {
return ListValue{
elementType: elementType,
state: attr.ValueStateUnknown,
}
}
// NewListValue creates a List with a known value. Access the value via the List
// type Elements or ElementsAs methods.
func NewListValue(elementType attr.Type, elements []attr.Value) (ListValue, diag.Diagnostics) {
var diags diag.Diagnostics
// Reference: https://github.com/hashicorp/terraform-plugin-framework/issues/521
ctx := context.Background()
for idx, element := range elements {
if !elementType.Equal(element.Type(ctx)) {
diags.AddError(
"Invalid List Element Type",
"While creating a List value, an invalid element was detected. "+
"A List must use the single, given element type. "+
"This is always an issue with the provider and should be reported to the provider developers.\n\n"+
fmt.Sprintf("List Element Type: %s\n", elementType.String())+
fmt.Sprintf("List Index (%d) Element Type: %s", idx, element.Type(ctx)),
)
}
}
if diags.HasError() {
return NewListUnknown(elementType), diags
}
return ListValue{
elementType: elementType,
elements: elements,
state: attr.ValueStateKnown,
}, nil
}
// NewListValueFrom creates a List with a known value, using reflection rules.
// The elements must be a slice which can convert into the given element type.
// Access the value via the List type Elements or ElementsAs methods.
func NewListValueFrom(ctx context.Context, elementType attr.Type, elements any) (ListValue, diag.Diagnostics) {
attrValue, diags := reflect.FromValue(
ctx,
ListType{ElemType: elementType},
elements,
path.Empty(),
)
if diags.HasError() {
return NewListUnknown(elementType), diags
}
list, ok := attrValue.(ListValue)
// This should not happen, but ensure there is an error if it does.
if !ok {
diags.AddError(
"Unable to Convert List Value",
"An unexpected result occurred when creating a List using NewListValueFrom. "+
"This is an issue with terraform-plugin-framework and should be reported to the provider developers.",
)
}
return list, diags
}
// NewListValueMust creates a List with a known value, converting any diagnostics
// into a panic at runtime. Access the value via the List
// type Elements or ElementsAs methods.
//
// This creation function is only recommended to create List values which will
// not potentially affect practitioners, such as testing, or exhaustively
// tested provider logic.
func NewListValueMust(elementType attr.Type, elements []attr.Value) ListValue {
list, diags := NewListValue(elementType, elements)
if diags.HasError() {
// This could potentially be added to the diag package.
diagsStrings := make([]string, 0, len(diags))
for _, diagnostic := range diags {
diagsStrings = append(diagsStrings, fmt.Sprintf(
"%s | %s | %s",
diagnostic.Severity(),
diagnostic.Summary(),
diagnostic.Detail()))
}
panic("NewListValueMust received error(s): " + strings.Join(diagsStrings, "\n"))
}
return list
}
// ListValue represents a list of attr.Values, all of the same type, indicated
// by ElemType.
type ListValue struct {
// elements is the collection of known values in the List.
elements []attr.Value
// elementType is the type of the elements in the List.
elementType attr.Type
// state represents whether the value is null, unknown, or known. The
// zero-value is null.
state attr.ValueState
}
// Elements returns a copy of the collection of elements for the List.
func (l ListValue) Elements() []attr.Value {
// Ensure callers cannot mutate the internal elements
result := make([]attr.Value, 0, len(l.elements))
result = append(result, l.elements...)
return result
}
// ElementsAs populates `target` with the elements of the ListValue, throwing an
// error if the elements cannot be stored in `target`.
func (l ListValue) ElementsAs(ctx context.Context, target interface{}, allowUnhandled bool) diag.Diagnostics {
// we need a tftypes.Value for this List to be able to use it with our
// reflection code
values, err := l.ToTerraformValue(ctx)
if err != nil {
return diag.Diagnostics{
diag.NewErrorDiagnostic(
"List Element Conversion Error",
"An unexpected error was encountered trying to convert list elements. This is always an error in the provider. Please report the following to the provider developer:\n\n"+err.Error(),
),
}
}
return reflect.Into(ctx, ListType{ElemType: l.elementType}, values, target, reflect.Options{
UnhandledNullAsEmpty: allowUnhandled,
UnhandledUnknownAsEmpty: allowUnhandled,
}, path.Empty())
}
// ElementType returns the element type for the List.
func (l ListValue) ElementType(_ context.Context) attr.Type {
return l.elementType
}
// Type returns a ListType with the same element type as `l`.
func (l ListValue) Type(ctx context.Context) attr.Type {
return ListType{ElemType: l.ElementType(ctx)}
}
// ToTerraformValue returns the data contained in the List as a tftypes.Value.
func (l ListValue) ToTerraformValue(ctx context.Context) (tftypes.Value, error) {
listType := tftypes.List{ElementType: l.ElementType(ctx).TerraformType(ctx)}
switch l.state {
case attr.ValueStateKnown:
vals := make([]tftypes.Value, 0, len(l.elements))
for _, elem := range l.elements {
val, err := elem.ToTerraformValue(ctx)
if err != nil {
return tftypes.NewValue(listType, tftypes.UnknownValue), err
}
vals = append(vals, val)
}
if err := tftypes.ValidateValue(listType, vals); err != nil {
return tftypes.NewValue(listType, tftypes.UnknownValue), err
}
return tftypes.NewValue(listType, vals), nil
case attr.ValueStateNull:
return tftypes.NewValue(listType, nil), nil
case attr.ValueStateUnknown:
return tftypes.NewValue(listType, tftypes.UnknownValue), nil
default:
panic(fmt.Sprintf("unhandled List state in ToTerraformValue: %s", l.state))
}
}
// Equal returns true if the List is considered semantically equal
// (same type and same value) to the attr.Value passed as an argument.
func (l ListValue) Equal(o attr.Value) bool {
other, ok := o.(ListValue)
if !ok {
return false
}
if !l.elementType.Equal(other.elementType) {
return false
}
if l.state != other.state {
return false
}
if l.state != attr.ValueStateKnown {
return true
}
if len(l.elements) != len(other.elements) {
return false
}
for idx, lElem := range l.elements {
otherElem := other.elements[idx]
if !lElem.Equal(otherElem) {
return false
}
}
return true
}
// IsNull returns true if the List represents a null value.
func (l ListValue) IsNull() bool {
return l.state == attr.ValueStateNull
}
// IsUnknown returns true if the List represents a currently unknown value.
// Returns false if the List has a known number of elements, even if all are
// unknown values.
func (l ListValue) IsUnknown() bool {
return l.state == attr.ValueStateUnknown
}
// String returns a human-readable representation of the List value.
// The string returned here is not protected by any compatibility guarantees,
// and is intended for logging and error reporting.
func (l ListValue) String() string {
if l.IsUnknown() {
return attr.UnknownValueString
}
if l.IsNull() {
return attr.NullValueString
}
var res strings.Builder
res.WriteString("[")
for i, e := range l.Elements() {
if i != 0 {
res.WriteString(",")
}
res.WriteString(e.String())
}
res.WriteString("]")
return res.String()
}
// ToListValue returns the List.
func (l ListValue) ToListValue(context.Context) (ListValue, diag.Diagnostics) {
return l, nil
}