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bae9f6d2 JC |
1 | package terraform |
2 | ||
3 | import ( | |
4 | "fmt" | |
5 | ||
6 | "github.com/hashicorp/terraform/config" | |
9b12e4fe | 7 | "github.com/hashicorp/terraform/dag" |
bae9f6d2 JC |
8 | ) |
9 | ||
9b12e4fe JC |
10 | // NodeRefreshableManagedResource represents a resource that is expanabled into |
11 | // NodeRefreshableManagedResourceInstance. Resource count orphans are also added. | |
12 | type NodeRefreshableManagedResource struct { | |
13 | *NodeAbstractCountResource | |
14 | } | |
15 | ||
16 | // GraphNodeDynamicExpandable | |
17 | func (n *NodeRefreshableManagedResource) DynamicExpand(ctx EvalContext) (*Graph, error) { | |
18 | // Grab the state which we read | |
19 | state, lock := ctx.State() | |
20 | lock.RLock() | |
21 | defer lock.RUnlock() | |
22 | ||
23 | // Expand the resource count which must be available by now from EvalTree | |
24 | count, err := n.Config.Count() | |
25 | if err != nil { | |
26 | return nil, err | |
27 | } | |
28 | ||
29 | // The concrete resource factory we'll use | |
30 | concreteResource := func(a *NodeAbstractResource) dag.Vertex { | |
31 | // Add the config and state since we don't do that via transforms | |
32 | a.Config = n.Config | |
33 | ||
34 | return &NodeRefreshableManagedResourceInstance{ | |
35 | NodeAbstractResource: a, | |
36 | } | |
37 | } | |
38 | ||
39 | // Start creating the steps | |
40 | steps := []GraphTransformer{ | |
41 | // Expand the count. | |
42 | &ResourceCountTransformer{ | |
43 | Concrete: concreteResource, | |
44 | Count: count, | |
45 | Addr: n.ResourceAddr(), | |
46 | }, | |
47 | ||
9b12e4fe JC |
48 | // Add the count orphans to make sure these resources are accounted for |
49 | // during a scale in. | |
50 | &OrphanResourceCountTransformer{ | |
51 | Concrete: concreteResource, | |
52 | Count: count, | |
53 | Addr: n.ResourceAddr(), | |
54 | State: state, | |
55 | }, | |
56 | ||
57 | // Attach the state | |
58 | &AttachStateTransformer{State: state}, | |
59 | ||
60 | // Targeting | |
61 | &TargetsTransformer{ParsedTargets: n.Targets}, | |
62 | ||
63 | // Connect references so ordering is correct | |
64 | &ReferenceTransformer{}, | |
65 | ||
66 | // Make sure there is a single root | |
67 | &RootTransformer{}, | |
68 | } | |
69 | ||
70 | // Build the graph | |
71 | b := &BasicGraphBuilder{ | |
72 | Steps: steps, | |
73 | Validate: true, | |
74 | Name: "NodeRefreshableManagedResource", | |
75 | } | |
76 | ||
77 | return b.Build(ctx.Path()) | |
78 | } | |
79 | ||
80 | // NodeRefreshableManagedResourceInstance represents a resource that is "applyable": | |
bae9f6d2 | 81 | // it is ready to be applied and is represented by a diff. |
9b12e4fe | 82 | type NodeRefreshableManagedResourceInstance struct { |
bae9f6d2 JC |
83 | *NodeAbstractResource |
84 | } | |
85 | ||
86 | // GraphNodeDestroyer | |
9b12e4fe | 87 | func (n *NodeRefreshableManagedResourceInstance) DestroyAddr() *ResourceAddress { |
bae9f6d2 JC |
88 | return n.Addr |
89 | } | |
90 | ||
91 | // GraphNodeEvalable | |
9b12e4fe | 92 | func (n *NodeRefreshableManagedResourceInstance) EvalTree() EvalNode { |
bae9f6d2 JC |
93 | // Eval info is different depending on what kind of resource this is |
94 | switch mode := n.Addr.Mode; mode { | |
95 | case config.ManagedResourceMode: | |
c680a8e1 RS |
96 | if n.ResourceState == nil { |
97 | return n.evalTreeManagedResourceNoState() | |
98 | } | |
bae9f6d2 JC |
99 | return n.evalTreeManagedResource() |
100 | ||
101 | case config.DataResourceMode: | |
102 | // Get the data source node. If we don't have a configuration | |
103 | // then it is an orphan so we destroy it (remove it from the state). | |
104 | var dn GraphNodeEvalable | |
105 | if n.Config != nil { | |
106 | dn = &NodeRefreshableDataResourceInstance{ | |
107 | NodeAbstractResource: n.NodeAbstractResource, | |
108 | } | |
109 | } else { | |
110 | dn = &NodeDestroyableDataResource{ | |
111 | NodeAbstractResource: n.NodeAbstractResource, | |
112 | } | |
113 | } | |
114 | ||
115 | return dn.EvalTree() | |
116 | default: | |
117 | panic(fmt.Errorf("unsupported resource mode %s", mode)) | |
118 | } | |
119 | } | |
120 | ||
9b12e4fe | 121 | func (n *NodeRefreshableManagedResourceInstance) evalTreeManagedResource() EvalNode { |
bae9f6d2 JC |
122 | addr := n.NodeAbstractResource.Addr |
123 | ||
124 | // stateId is the ID to put into the state | |
125 | stateId := addr.stateId() | |
126 | ||
127 | // Build the instance info. More of this will be populated during eval | |
128 | info := &InstanceInfo{ | |
129 | Id: stateId, | |
130 | Type: addr.Type, | |
131 | } | |
132 | ||
133 | // Declare a bunch of variables that are used for state during | |
134 | // evaluation. Most of this are written to by-address below. | |
135 | var provider ResourceProvider | |
136 | var state *InstanceState | |
137 | ||
138 | // This happened during initial development. All known cases were | |
139 | // fixed and tested but as a sanity check let's assert here. | |
140 | if n.ResourceState == nil { | |
141 | err := fmt.Errorf( | |
142 | "No resource state attached for addr: %s\n\n"+ | |
143 | "This is a bug. Please report this to Terraform with your configuration\n"+ | |
144 | "and state attached. Please be careful to scrub any sensitive information.", | |
145 | addr) | |
146 | return &EvalReturnError{Error: &err} | |
147 | } | |
148 | ||
149 | return &EvalSequence{ | |
150 | Nodes: []EvalNode{ | |
151 | &EvalGetProvider{ | |
152 | Name: n.ProvidedBy()[0], | |
153 | Output: &provider, | |
154 | }, | |
155 | &EvalReadState{ | |
156 | Name: stateId, | |
157 | Output: &state, | |
158 | }, | |
159 | &EvalRefresh{ | |
160 | Info: info, | |
161 | Provider: &provider, | |
162 | State: &state, | |
163 | Output: &state, | |
164 | }, | |
165 | &EvalWriteState{ | |
166 | Name: stateId, | |
167 | ResourceType: n.ResourceState.Type, | |
168 | Provider: n.ResourceState.Provider, | |
169 | Dependencies: n.ResourceState.Dependencies, | |
170 | State: &state, | |
171 | }, | |
172 | }, | |
173 | } | |
174 | } | |
c680a8e1 RS |
175 | |
176 | // evalTreeManagedResourceNoState produces an EvalSequence for refresh resource | |
177 | // nodes that don't have state attached. An example of where this functionality | |
178 | // is useful is when a resource that already exists in state is being scaled | |
179 | // out, ie: has its resource count increased. In this case, the scaled out node | |
180 | // needs to be available to other nodes (namely data sources) that may depend | |
181 | // on it for proper interpolation, or confusing "index out of range" errors can | |
182 | // occur. | |
183 | // | |
184 | // The steps in this sequence are very similar to the steps carried out in | |
185 | // plan, but nothing is done with the diff after it is created - it is dropped, | |
186 | // and its changes are not counted in the UI. | |
187 | func (n *NodeRefreshableManagedResourceInstance) evalTreeManagedResourceNoState() EvalNode { | |
188 | // Declare a bunch of variables that are used for state during | |
189 | // evaluation. Most of this are written to by-address below. | |
190 | var provider ResourceProvider | |
191 | var state *InstanceState | |
192 | var resourceConfig *ResourceConfig | |
193 | ||
194 | addr := n.NodeAbstractResource.Addr | |
195 | stateID := addr.stateId() | |
196 | info := &InstanceInfo{ | |
197 | Id: stateID, | |
198 | Type: addr.Type, | |
199 | ModulePath: normalizeModulePath(addr.Path), | |
200 | } | |
201 | ||
202 | // Build the resource for eval | |
203 | resource := &Resource{ | |
204 | Name: addr.Name, | |
205 | Type: addr.Type, | |
206 | CountIndex: addr.Index, | |
207 | } | |
208 | if resource.CountIndex < 0 { | |
209 | resource.CountIndex = 0 | |
210 | } | |
211 | ||
212 | // Determine the dependencies for the state. | |
213 | stateDeps := n.StateReferences() | |
214 | ||
215 | return &EvalSequence{ | |
216 | Nodes: []EvalNode{ | |
217 | &EvalInterpolate{ | |
218 | Config: n.Config.RawConfig.Copy(), | |
219 | Resource: resource, | |
220 | Output: &resourceConfig, | |
221 | }, | |
222 | &EvalGetProvider{ | |
223 | Name: n.ProvidedBy()[0], | |
224 | Output: &provider, | |
225 | }, | |
226 | // Re-run validation to catch any errors we missed, e.g. type | |
227 | // mismatches on computed values. | |
228 | &EvalValidateResource{ | |
229 | Provider: &provider, | |
230 | Config: &resourceConfig, | |
231 | ResourceName: n.Config.Name, | |
232 | ResourceType: n.Config.Type, | |
233 | ResourceMode: n.Config.Mode, | |
234 | IgnoreWarnings: true, | |
235 | }, | |
236 | &EvalReadState{ | |
237 | Name: stateID, | |
238 | Output: &state, | |
239 | }, | |
240 | &EvalDiff{ | |
241 | Name: stateID, | |
242 | Info: info, | |
243 | Config: &resourceConfig, | |
244 | Resource: n.Config, | |
245 | Provider: &provider, | |
246 | State: &state, | |
247 | OutputState: &state, | |
248 | Stub: true, | |
249 | }, | |
250 | &EvalWriteState{ | |
251 | Name: stateID, | |
252 | ResourceType: n.Config.Type, | |
253 | Provider: n.Config.Provider, | |
254 | Dependencies: stateDeps, | |
255 | State: &state, | |
256 | }, | |
257 | }, | |
258 | } | |
259 | } |