forked from hashicorp/terraform
/
graph_builder_apply.go
133 lines (105 loc) · 3.43 KB
/
graph_builder_apply.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
package terraform
import (
"github.com/hashicorp/terraform/config/module"
"github.com/hashicorp/terraform/dag"
)
// ApplyGraphBuilder implements GraphBuilder and is responsible for building
// a graph for applying a Terraform diff.
//
// Because the graph is built from the diff (vs. the config or state),
// this helps ensure that the apply-time graph doesn't modify any resources
// that aren't explicitly in the diff. There are other scenarios where the
// diff can be deviated, so this is just one layer of protection.
type ApplyGraphBuilder struct {
// Module is the root module for the graph to build.
Module *module.Tree
// Diff is the diff to apply.
Diff *Diff
// State is the current state
State *State
// Providers is the list of providers supported.
Providers []string
// Provisioners is the list of provisioners supported.
Provisioners []string
// DisableReduce, if true, will not reduce the graph. Great for testing.
DisableReduce bool
// Destroy, if true, represents a pure destroy operation
Destroy bool
// Validate will do structural validation of the graph.
Validate bool
}
// See GraphBuilder
func (b *ApplyGraphBuilder) Build(path []string) (*Graph, error) {
return (&BasicGraphBuilder{
Steps: b.Steps(),
Validate: b.Validate,
Name: "ApplyGraphBuilder",
}).Build(path)
}
// See GraphBuilder
func (b *ApplyGraphBuilder) Steps() []GraphTransformer {
// Custom factory for creating providers.
concreteProvider := func(a *NodeAbstractProvider) dag.Vertex {
return &NodeApplyableProvider{
NodeAbstractProvider: a,
}
}
concreteResource := func(a *NodeAbstractResource) dag.Vertex {
return &NodeApplyableResource{
NodeAbstractResource: a,
}
}
steps := []GraphTransformer{
// Creates all the nodes represented in the diff.
&DiffTransformer{
Concrete: concreteResource,
Diff: b.Diff,
Module: b.Module,
State: b.State,
},
// Create orphan output nodes
&OrphanOutputTransformer{Module: b.Module, State: b.State},
// Attach the configuration to any resources
&AttachResourceConfigTransformer{Module: b.Module},
// Attach the state
&AttachStateTransformer{State: b.State},
// Create all the providers
&MissingProviderTransformer{Providers: b.Providers, Concrete: concreteProvider},
&ProviderTransformer{},
&DisableProviderTransformer{},
&ParentProviderTransformer{},
&AttachProviderConfigTransformer{Module: b.Module},
// Destruction ordering
&DestroyEdgeTransformer{Module: b.Module, State: b.State},
GraphTransformIf(
func() bool { return !b.Destroy },
&CBDEdgeTransformer{Module: b.Module, State: b.State},
),
// Provisioner-related transformations
GraphTransformIf(
func() bool { return !b.Destroy },
GraphTransformMulti(
&MissingProvisionerTransformer{Provisioners: b.Provisioners},
&ProvisionerTransformer{},
),
),
// Add root variables
&RootVariableTransformer{Module: b.Module},
// Add the outputs
&OutputTransformer{Module: b.Module},
// Add module variables
&ModuleVariableTransformer{Module: b.Module},
// Connect references so ordering is correct
&ReferenceTransformer{},
// Add the node to fix the state count boundaries
&CountBoundaryTransformer{},
// Single root
&RootTransformer{},
}
if !b.DisableReduce {
// Perform the transitive reduction to make our graph a bit
// more sane if possible (it usually is possible).
steps = append(steps, &TransitiveReductionTransformer{})
}
return steps
}