Repository navigation
Expand file tree
/
Copy pathcontext.go
More file actions
906 lines (776 loc) · 25.1 KB
/
Copy pathcontext.go
File metadata and controls
906 lines (776 loc) · 25.1 KB
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
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
package terraform
import (
"fmt"
"log"
"sort"
"strings"
"sync"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/hcl"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/config/module"
"github.com/hashicorp/terraform/helper/experiment"
)
// InputMode defines what sort of input will be asked for when Input
// is called on Context.
type InputMode byte
const (
// InputModeVar asks for all variables
InputModeVar InputMode = 1 << iota
// InputModeVarUnset asks for variables which are not set yet.
// InputModeVar must be set for this to have an effect.
InputModeVarUnset
// InputModeProvider asks for provider variables
InputModeProvider
// InputModeStd is the standard operating mode and asks for both variables
// and providers.
InputModeStd = InputModeVar | InputModeProvider
)
var (
// contextFailOnShadowError will cause Context operations to return
// errors when shadow operations fail. This is only used for testing.
contextFailOnShadowError = false
// contextTestDeepCopyOnPlan will perform a Diff DeepCopy on every
// Plan operation, effectively testing the Diff DeepCopy whenever
// a Plan occurs. This is enabled for tests.
contextTestDeepCopyOnPlan = false
)
// ContextOpts are the user-configurable options to create a context with
// NewContext.
type ContextOpts struct {
Destroy bool
Diff *Diff
Hooks []Hook
Module *module.Tree
Parallelism int
State *State
StateFutureAllowed bool
Providers map[string]ResourceProviderFactory
Provisioners map[string]ResourceProvisionerFactory
Shadow bool
Targets []string
Variables map[string]interface{}
UIInput UIInput
}
// Context represents all the context that Terraform needs in order to
// perform operations on infrastructure. This structure is built using
// NewContext. See the documentation for that.
//
// Extra functions on Context can be found in context_*.go files.
type Context struct {
// Maintainer note: Anytime this struct is changed, please verify
// that newShadowContext still does the right thing. Tests should
// fail regardless but putting this note here as well.
components contextComponentFactory
destroy bool
diff *Diff
diffLock sync.RWMutex
hooks []Hook
module *module.Tree
sh *stopHook
shadow bool
state *State
stateLock sync.RWMutex
targets []string
uiInput UIInput
variables map[string]interface{}
l sync.Mutex // Lock acquired during any task
parallelSem Semaphore
providerInputConfig map[string]map[string]interface{}
runCh <-chan struct{}
stopCh chan struct{}
shadowErr error
}
// NewContext creates a new Context structure.
//
// Once a Context is creator, the pointer values within ContextOpts
// should not be mutated in any way, since the pointers are copied, not
// the values themselves.
func NewContext(opts *ContextOpts) (*Context, error) {
// Copy all the hooks and add our stop hook. We don't append directly
// to the Config so that we're not modifying that in-place.
sh := new(stopHook)
hooks := make([]Hook, len(opts.Hooks)+1)
copy(hooks, opts.Hooks)
hooks[len(opts.Hooks)] = sh
state := opts.State
if state == nil {
state = new(State)
state.init()
}
// If our state is from the future, then error. Callers can avoid
// this error by explicitly setting `StateFutureAllowed`.
if !opts.StateFutureAllowed && state.FromFutureTerraform() {
return nil, fmt.Errorf(
"Terraform doesn't allow running any operations against a state\n"+
"that was written by a future Terraform version. The state is\n"+
"reporting it is written by Terraform '%s'.\n\n"+
"Please run at least that version of Terraform to continue.",
state.TFVersion)
}
// Explicitly reset our state version to our current version so that
// any operations we do will write out that our latest version
// has run.
state.TFVersion = Version
// Determine parallelism, default to 10. We do this both to limit
// CPU pressure but also to have an extra guard against rate throttling
// from providers.
par := opts.Parallelism
if par == 0 {
par = 10
}
// Set up the variables in the following sequence:
// 0 - Take default values from the configuration
// 1 - Take values from TF_VAR_x environment variables
// 2 - Take values specified in -var flags, overriding values
// set by environment variables if necessary. This includes
// values taken from -var-file in addition.
variables := make(map[string]interface{})
if opts.Module != nil {
var err error
variables, err = Variables(opts.Module, opts.Variables)
if err != nil {
return nil, err
}
}
return &Context{
components: &basicComponentFactory{
providers: opts.Providers,
provisioners: opts.Provisioners,
},
destroy: opts.Destroy,
diff: opts.Diff,
hooks: hooks,
module: opts.Module,
shadow: opts.Shadow,
state: state,
targets: opts.Targets,
uiInput: opts.UIInput,
variables: variables,
parallelSem: NewSemaphore(par),
providerInputConfig: make(map[string]map[string]interface{}),
sh: sh,
}, nil
}
type ContextGraphOpts struct {
Validate bool
Verbose bool
}
// Graph returns the graph for this config.
func (c *Context) Graph(g *ContextGraphOpts) (*Graph, error) {
return c.graphBuilder(g).Build(RootModulePath)
}
// GraphBuilder returns the GraphBuilder that will be used to create
// the graphs for this context.
func (c *Context) graphBuilder(g *ContextGraphOpts) GraphBuilder {
return &BuiltinGraphBuilder{
Root: c.module,
Diff: c.diff,
Providers: c.components.ResourceProviders(),
Provisioners: c.components.ResourceProvisioners(),
State: c.state,
Targets: c.targets,
Destroy: c.destroy,
Validate: g.Validate,
Verbose: g.Verbose,
}
}
// ShadowError returns any errors caught during a shadow operation.
//
// A shadow operation is an operation run in parallel to a real operation
// that performs the same tasks using new logic on copied state. The results
// are compared to ensure that the new logic works the same as the old logic.
// The shadow never affects the real operation or return values.
//
// The result of the shadow operation are only available through this function
// call after a real operation is complete.
//
// For API consumers of Context, you can safely ignore this function
// completely if you have no interest in helping report experimental feature
// errors to Terraform maintainers. Otherwise, please call this function
// after every operation and report this to the user.
//
// IMPORTANT: Shadow errors are _never_ critical: they _never_ affect
// the real state or result of a real operation. They are purely informational
// to assist in future Terraform versions being more stable. Please message
// this effectively to the end user.
//
// This must be called only when no other operation is running (refresh,
// plan, etc.). The result can be used in parallel to any other operation
// running.
func (c *Context) ShadowError() error {
return c.shadowErr
}
// Interpolater returns an Interpolater built on a copy of the state
// that can be used to test interpolation values.
func (c *Context) Interpolater() *Interpolater {
var varLock sync.Mutex
var stateLock sync.RWMutex
return &Interpolater{
Operation: walkApply,
Module: c.module,
State: c.state.DeepCopy(),
StateLock: &stateLock,
VariableValues: map[string]interface{}{},
VariableValuesLock: &varLock,
}
}
// Input asks for input to fill variables and provider configurations.
// This modifies the configuration in-place, so asking for Input twice
// may result in different UI output showing different current values.
func (c *Context) Input(mode InputMode) error {
v := c.acquireRun("input")
defer c.releaseRun(v)
if mode&InputModeVar != 0 {
// Walk the variables first for the root module. We walk them in
// alphabetical order for UX reasons.
rootConf := c.module.Config()
names := make([]string, len(rootConf.Variables))
m := make(map[string]*config.Variable)
for i, v := range rootConf.Variables {
names[i] = v.Name
m[v.Name] = v
}
sort.Strings(names)
for _, n := range names {
// If we only care about unset variables, then if the variable
// is set, continue on.
if mode&InputModeVarUnset != 0 {
if _, ok := c.variables[n]; ok {
continue
}
}
var valueType config.VariableType
v := m[n]
switch valueType = v.Type(); valueType {
case config.VariableTypeUnknown:
continue
case config.VariableTypeMap:
// OK
case config.VariableTypeList:
// OK
case config.VariableTypeString:
// OK
default:
panic(fmt.Sprintf("Unknown variable type: %#v", v.Type()))
}
// If the variable is not already set, and the variable defines a
// default, use that for the value.
if _, ok := c.variables[n]; !ok {
if v.Default != nil {
c.variables[n] = v.Default.(string)
continue
}
}
// this should only happen during tests
if c.uiInput == nil {
log.Println("[WARN] Content.uiInput is nil")
continue
}
// Ask the user for a value for this variable
var value string
retry := 0
for {
var err error
value, err = c.uiInput.Input(&InputOpts{
Id: fmt.Sprintf("var.%s", n),
Query: fmt.Sprintf("var.%s", n),
Description: v.Description,
})
if err != nil {
return fmt.Errorf(
"Error asking for %s: %s", n, err)
}
if value == "" && v.Required() {
// Redo if it is required, but abort if we keep getting
// blank entries
if retry > 2 {
return fmt.Errorf("missing required value for %q", n)
}
retry++
continue
}
break
}
// no value provided, so don't set the variable at all
if value == "" {
continue
}
decoded, err := parseVariableAsHCL(n, value, valueType)
if err != nil {
return err
}
if decoded != nil {
c.variables[n] = decoded
}
}
}
if mode&InputModeProvider != 0 {
// Build the graph
graph, err := c.Graph(&ContextGraphOpts{Validate: true})
if err != nil {
return err
}
// Do the walk
if _, err := c.walk(graph, nil, walkInput); err != nil {
return err
}
}
return nil
}
// Apply applies the changes represented by this context and returns
// the resulting state.
//
// In addition to returning the resulting state, this context is updated
// with the latest state.
func (c *Context) Apply() (*State, error) {
v := c.acquireRun("apply")
defer c.releaseRun(v)
// Copy our own state
c.state = c.state.DeepCopy()
// Enable the new graph by default
X_legacyGraph := experiment.Enabled(experiment.X_legacyGraph)
// Build the graph.
var graph *Graph
var err error
if !X_legacyGraph {
graph, err = (&ApplyGraphBuilder{
Module: c.module,
Diff: c.diff,
State: c.state,
Providers: c.components.ResourceProviders(),
Provisioners: c.components.ResourceProvisioners(),
Destroy: c.destroy,
}).Build(RootModulePath)
} else {
graph, err = c.Graph(&ContextGraphOpts{Validate: true})
}
if err != nil {
return nil, err
}
// Determine the operation
operation := walkApply
if c.destroy {
operation = walkDestroy
}
// Walk the graph
walker, err := c.walk(graph, graph, operation)
if len(walker.ValidationErrors) > 0 {
err = multierror.Append(err, walker.ValidationErrors...)
}
// Clean out any unused things
c.state.prune()
return c.state, err
}
// Plan generates an execution plan for the given context.
//
// The execution plan encapsulates the context and can be stored
// in order to reinstantiate a context later for Apply.
//
// Plan also updates the diff of this context to be the diff generated
// by the plan, so Apply can be called after.
func (c *Context) Plan() (*Plan, error) {
v := c.acquireRun("plan")
defer c.releaseRun(v)
p := &Plan{
Module: c.module,
Vars: c.variables,
State: c.state,
Targets: c.targets,
}
var operation walkOperation
if c.destroy {
operation = walkPlanDestroy
} else {
// Set our state to be something temporary. We do this so that
// the plan can update a fake state so that variables work, then
// we replace it back with our old state.
old := c.state
if old == nil {
c.state = &State{}
c.state.init()
} else {
c.state = old.DeepCopy()
}
defer func() {
c.state = old
}()
operation = walkPlan
}
// Setup our diff
c.diffLock.Lock()
c.diff = new(Diff)
c.diff.init()
c.diffLock.Unlock()
// Used throughout below
X_legacyGraph := experiment.Enabled(experiment.X_legacyGraph)
// Build the graph.
var graph *Graph
var err error
if !X_legacyGraph {
if c.destroy {
graph, err = (&DestroyPlanGraphBuilder{
Module: c.module,
State: c.state,
Targets: c.targets,
}).Build(RootModulePath)
} else {
graph, err = (&PlanGraphBuilder{
Module: c.module,
State: c.state,
Providers: c.components.ResourceProviders(),
Targets: c.targets,
}).Build(RootModulePath)
}
} else {
graph, err = c.Graph(&ContextGraphOpts{Validate: true})
}
if err != nil {
return nil, err
}
// Do the walk
walker, err := c.walk(graph, graph, operation)
if err != nil {
return nil, err
}
p.Diff = c.diff
// If this is true, it means we're running unit tests. In this case,
// we perform a deep copy just to ensure that all context tests also
// test that a diff is copy-able. This will panic if it fails. This
// is enabled during unit tests.
//
// This should never be true during production usage, but even if it is,
// it can't do any real harm.
if contextTestDeepCopyOnPlan {
p.Diff.DeepCopy()
}
// We don't do the reverification during the new destroy plan because
// it will use a different apply process.
if X_legacyGraph {
// Now that we have a diff, we can build the exact graph that Apply will use
// and catch any possible cycles during the Plan phase.
if _, err := c.Graph(&ContextGraphOpts{Validate: true}); err != nil {
return nil, err
}
}
var errs error
if len(walker.ValidationErrors) > 0 {
errs = multierror.Append(errs, walker.ValidationErrors...)
}
return p, errs
}
// Refresh goes through all the resources in the state and refreshes them
// to their latest state. This will update the state that this context
// works with, along with returning it.
//
// Even in the case an error is returned, the state will be returned and
// will potentially be partially updated.
func (c *Context) Refresh() (*State, error) {
v := c.acquireRun("refresh")
defer c.releaseRun(v)
// Copy our own state
c.state = c.state.DeepCopy()
// Build the graph
graph, err := c.Graph(&ContextGraphOpts{Validate: true})
if err != nil {
return nil, err
}
// Do the walk
if _, err := c.walk(graph, graph, walkRefresh); err != nil {
return nil, err
}
// Clean out any unused things
c.state.prune()
return c.state, nil
}
// Stop stops the running task.
//
// Stop will block until the task completes.
func (c *Context) Stop() {
c.l.Lock()
ch := c.runCh
// If we aren't running, then just return
if ch == nil {
c.l.Unlock()
return
}
// Tell the hook we want to stop
c.sh.Stop()
// Close the stop channel
close(c.stopCh)
// Wait for us to stop
c.l.Unlock()
<-ch
}
// Validate validates the configuration and returns any warnings or errors.
func (c *Context) Validate() ([]string, []error) {
v := c.acquireRun("validate")
defer c.releaseRun(v)
var errs error
// Validate the configuration itself
if err := c.module.Validate(); err != nil {
errs = multierror.Append(errs, err)
}
// This only needs to be done for the root module, since inter-module
// variables are validated in the module tree.
if config := c.module.Config(); config != nil {
// Validate the user variables
if err := smcUserVariables(config, c.variables); len(err) > 0 {
errs = multierror.Append(errs, err...)
}
}
// If we have errors at this point, the graphing has no chance,
// so just bail early.
if errs != nil {
return nil, []error{errs}
}
// Build the graph so we can walk it and run Validate on nodes.
// We also validate the graph generated here, but this graph doesn't
// necessarily match the graph that Plan will generate, so we'll validate the
// graph again later after Planning.
graph, err := c.Graph(&ContextGraphOpts{Validate: true})
if err != nil {
return nil, []error{err}
}
// Walk
walker, err := c.walk(graph, graph, walkValidate)
if err != nil {
return nil, multierror.Append(errs, err).Errors
}
// Return the result
rerrs := multierror.Append(errs, walker.ValidationErrors...)
return walker.ValidationWarnings, rerrs.Errors
}
// Module returns the module tree associated with this context.
func (c *Context) Module() *module.Tree {
return c.module
}
// Variables will return the mapping of variables that were defined
// for this Context. If Input was called, this mapping may be different
// than what was given.
func (c *Context) Variables() map[string]interface{} {
return c.variables
}
// SetVariable sets a variable after a context has already been built.
func (c *Context) SetVariable(k string, v interface{}) {
c.variables[k] = v
}
func (c *Context) acquireRun(phase string) chan<- struct{} {
c.l.Lock()
defer c.l.Unlock()
dbug.SetPhase(phase)
// Wait for no channel to exist
for c.runCh != nil {
c.l.Unlock()
ch := c.runCh
<-ch
c.l.Lock()
}
// Create the new channel
ch := make(chan struct{})
c.runCh = ch
// Reset the stop channel so we can watch that
c.stopCh = make(chan struct{})
// Reset the stop hook so we're not stopped
c.sh.Reset()
// Reset the shadow errors
c.shadowErr = nil
return ch
}
func (c *Context) releaseRun(ch chan<- struct{}) {
c.l.Lock()
defer c.l.Unlock()
// setting the phase to "INVALID" lets us easily detect if we have
// operations happening outside of a run, or we missed setting the proper
// phase
dbug.SetPhase("INVALID")
close(ch)
c.runCh = nil
c.stopCh = nil
}
func (c *Context) walk(
graph, shadow *Graph, operation walkOperation) (*ContextGraphWalker, error) {
// Keep track of the "real" context which is the context that does
// the real work: talking to real providers, modifying real state, etc.
realCtx := c
// If we don't want shadowing, remove it
if !experiment.Enabled(experiment.X_shadow) {
shadow = nil
}
// If we have a shadow graph, walk that as well
var shadowCtx *Context
var shadowCloser Shadow
if c.shadow && shadow != nil {
// Build the shadow context. In the process, override the real context
// with the one that is wrapped so that the shadow context can verify
// the results of the real.
realCtx, shadowCtx, shadowCloser = newShadowContext(c)
}
// Just log this so we can see it in a debug log
if !c.shadow {
log.Printf("[WARN] terraform: shadow graph disabled")
}
log.Printf("[DEBUG] Starting graph walk: %s", operation.String())
dg, _ := NewDebugGraph("walk", graph, nil)
walker := &ContextGraphWalker{
Context: realCtx,
Operation: operation,
DebugGraph: dg,
}
// Watch for a stop so we can call the provider Stop() API.
doneCh := make(chan struct{})
go c.watchStop(walker, c.stopCh, doneCh)
// Walk the real graph, this will block until it completes
realErr := graph.Walk(walker)
// Close the done channel so the watcher stops
close(doneCh)
// If we have a shadow graph and we interrupted the real graph, then
// we just close the shadow and never verify it. It is non-trivial to
// recreate the exact execution state up until an interruption so this
// isn't supported with shadows at the moment.
if shadowCloser != nil && c.sh.Stopped() {
// Ignore the error result, there is nothing we could care about
shadowCloser.CloseShadow()
// Set it to nil so we don't do anything
shadowCloser = nil
}
// If we have a shadow graph, wait for that to complete.
if shadowCloser != nil {
// create a debug graph for this walk
dg, err := NewDebugGraph("walk-shadow", shadow, nil)
if err != nil {
log.Printf("[ERROR] %v", err)
}
// Build the graph walker for the shadow. We also wrap this in
// a panicwrap so that panics are captured. For the shadow graph,
// we just want panics to be normal errors rather than to crash
// Terraform.
shadowWalker := GraphWalkerPanicwrap(&ContextGraphWalker{
Context: shadowCtx,
Operation: operation,
DebugGraph: dg,
})
// Kick off the shadow walk. This will block on any operations
// on the real walk so it is fine to start first.
log.Printf("[INFO] Starting shadow graph walk: %s", operation.String())
shadowCh := make(chan error)
go func() {
shadowCh <- shadow.Walk(shadowWalker)
}()
// Notify the shadow that we're done
if err := shadowCloser.CloseShadow(); err != nil {
c.shadowErr = multierror.Append(c.shadowErr, err)
}
// Wait for the walk to end
log.Printf("[DEBUG] Waiting for shadow graph to complete...")
shadowWalkErr := <-shadowCh
// Get any shadow errors
if err := shadowCloser.ShadowError(); err != nil {
c.shadowErr = multierror.Append(c.shadowErr, err)
}
// Verify the contexts (compare)
if err := shadowContextVerify(realCtx, shadowCtx); err != nil {
c.shadowErr = multierror.Append(c.shadowErr, err)
}
// At this point, if we're supposed to fail on error, then
// we PANIC. Some tests just verify that there is an error,
// so simply appending it to realErr and returning could hide
// shadow problems.
//
// This must be done BEFORE appending shadowWalkErr since the
// shadowWalkErr may include expected errors.
//
// We only do this if we don't have a real error. In the case of
// a real error, we can't guarantee what nodes were and weren't
// traversed in parallel scenarios so we can't guarantee no
// shadow errors.
if c.shadowErr != nil && contextFailOnShadowError && realErr == nil {
panic(multierror.Prefix(c.shadowErr, "shadow graph:"))
}
// Now, if we have a walk error, we append that through
if shadowWalkErr != nil {
c.shadowErr = multierror.Append(c.shadowErr, shadowWalkErr)
}
if c.shadowErr == nil {
log.Printf("[INFO] Shadow graph success!")
} else {
log.Printf("[ERROR] Shadow graph error: %s", c.shadowErr)
// If we're supposed to fail on shadow errors, then report it
if contextFailOnShadowError {
realErr = multierror.Append(realErr, multierror.Prefix(
c.shadowErr, "shadow graph:"))
}
}
}
return walker, realErr
}
func (c *Context) watchStop(walker *ContextGraphWalker, stopCh, doneCh <-chan struct{}) {
// Wait for a stop or completion
select {
case <-stopCh:
// Stop was triggered. Fall out of the select
case <-doneCh:
// Done, just exit completely
return
}
// If we're here, we're stopped, trigger the call.
// Copy the providers so that a misbehaved blocking Stop doesn't
// completely hang Terraform.
walker.providerLock.Lock()
ps := make([]ResourceProvider, 0, len(walker.providerCache))
for _, p := range walker.providerCache {
ps = append(ps, p)
}
defer walker.providerLock.Unlock()
for _, p := range ps {
// We ignore the error for now since there isn't any reasonable
// action to take if there is an error here, since the stop is still
// advisory: Terraform will exit once the graph node completes.
p.Stop()
}
}
// parseVariableAsHCL parses the value of a single variable as would have been specified
// on the command line via -var or in an environment variable named TF_VAR_x, where x is
// the name of the variable. In order to get around the restriction of HCL requiring a
// top level object, we prepend a sentinel key, decode the user-specified value as its
// value and pull the value back out of the resulting map.
func parseVariableAsHCL(name string, input string, targetType config.VariableType) (interface{}, error) {
// expecting a string so don't decode anything, just strip quotes
if targetType == config.VariableTypeString {
return strings.Trim(input, `"`), nil
}
// return empty types
if strings.TrimSpace(input) == "" {
switch targetType {
case config.VariableTypeList:
return []interface{}{}, nil
case config.VariableTypeMap:
return make(map[string]interface{}), nil
}
}
const sentinelValue = "SENTINEL_TERRAFORM_VAR_OVERRIDE_KEY"
inputWithSentinal := fmt.Sprintf("%s = %s", sentinelValue, input)
var decoded map[string]interface{}
err := hcl.Decode(&decoded, inputWithSentinal)
if err != nil {
return nil, fmt.Errorf("Cannot parse value for variable %s (%q) as valid HCL: %s", name, input, err)
}
if len(decoded) != 1 {
return nil, fmt.Errorf("Cannot parse value for variable %s (%q) as valid HCL. Only one value may be specified.", name, input)
}
parsedValue, ok := decoded[sentinelValue]
if !ok {
return nil, fmt.Errorf("Cannot parse value for variable %s (%q) as valid HCL. One value must be specified.", name, input)
}
switch targetType {
case config.VariableTypeList:
return parsedValue, nil
case config.VariableTypeMap:
if list, ok := parsedValue.([]map[string]interface{}); ok {
return list[0], nil
}
return nil, fmt.Errorf("Cannot parse value for variable %s (%q) as valid HCL. One value must be specified.", name, input)
default:
panic(fmt.Errorf("unknown type %s", targetType.Printable()))
}
}