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package terraform
import (
"fmt"
"github.com/hashicorp/terraform/config"
)
// NodePlannableResourceInstance represents a _single_ resource
// instance that is plannable. This means this represents a single
// count index, for example.
type NodePlannableResourceInstance struct {
*NodeAbstractResource
}
// GraphNodeEvalable
func (n *NodePlannableResourceInstance) EvalTree() EvalNode {
addr := n.NodeAbstractResource.Addr
// stateId is the ID to put into the state
stateId := addr.stateId()
// Build the instance info. More of this will be populated during eval
info := &InstanceInfo{
Id: stateId,
Type: addr.Type,
ModulePath: normalizeModulePath(addr.Path),
}
// Build the resource for eval
resource := &Resource{
Name: addr.Name,
Type: addr.Type,
CountIndex: addr.Index,
}
if resource.CountIndex < 0 {
resource.CountIndex = 0
}
// Determine the dependencies for the state.
stateDeps := n.StateReferences()
// Eval info is different depending on what kind of resource this is
switch n.Config.Mode {
case config.ManagedResourceMode:
return n.evalTreeManagedResource(
stateId, info, resource, stateDeps,
)
case config.DataResourceMode:
return n.evalTreeDataResource(
stateId, info, resource, stateDeps)
default:
panic(fmt.Errorf("unsupported resource mode %s", n.Config.Mode))
}
}
func (n *NodePlannableResourceInstance) evalTreeDataResource(
stateId string, info *InstanceInfo,
resource *Resource, stateDeps []string) EvalNode {
var provider ResourceProvider
var config *ResourceConfig
var diff *InstanceDiff
var state *InstanceState
return &EvalSequence{
Nodes: []EvalNode{
&EvalReadState{
Name: stateId,
Output: &state,
},
// We need to re-interpolate the config here because some
// of the attributes may have become computed during
// earlier planning, due to other resources having
// "requires new resource" diffs.
&EvalInterpolate{
Config: n.Config.RawConfig.Copy(),
Resource: resource,
Output: &config,
},
&EvalIf{
If: func(ctx EvalContext) (bool, error) {
computed := config.ComputedKeys != nil && len(config.ComputedKeys) > 0
// If the configuration is complete and we
// already have a state then we don't need to
// do any further work during apply, because we
// already populated the state during refresh.
if !computed && state != nil {
return true, EvalEarlyExitError{}
}
return true, nil
},
Then: EvalNoop{},
},
&EvalGetProvider{
Name: n.ProvidedBy()[0],
Output: &provider,
},
&EvalReadDataDiff{
Info: info,
Config: &config,
Provider: &provider,
Output: &diff,
OutputState: &state,
},
&EvalWriteState{
Name: stateId,
ResourceType: n.Config.Type,
Provider: n.Config.Provider,
Dependencies: stateDeps,
State: &state,
},
&EvalWriteDiff{
Name: stateId,
Diff: &diff,
},
},
}
}
func (n *NodePlannableResourceInstance) evalTreeManagedResource(
stateId string, info *InstanceInfo,
resource *Resource, stateDeps []string) EvalNode {
// Declare a bunch of variables that are used for state during
// evaluation. Most of this are written to by-address below.
var provider ResourceProvider
var diff *InstanceDiff
var state *InstanceState
var resourceConfig *ResourceConfig
return &EvalSequence{
Nodes: []EvalNode{
&EvalInterpolate{
Config: n.Config.RawConfig.Copy(),
Resource: resource,
Output: &resourceConfig,
},
&EvalGetProvider{
Name: n.ProvidedBy()[0],
Output: &provider,
},
// Re-run validation to catch any errors we missed, e.g. type
// mismatches on computed values.
&EvalValidateResource{
Provider: &provider,
Config: &resourceConfig,
ResourceName: n.Config.Name,
ResourceType: n.Config.Type,
ResourceMode: n.Config.Mode,
IgnoreWarnings: true,
},
&EvalReadState{
Name: stateId,
Output: &state,
},
&EvalDiff{
Name: stateId,
Info: info,
Config: &resourceConfig,
Resource: n.Config,
Provider: &provider,
State: &state,
OutputDiff: &diff,
OutputState: &state,
},
&EvalCheckPreventDestroy{
Resource: n.Config,
Diff: &diff,
},
&EvalWriteState{
Name: stateId,
ResourceType: n.Config.Type,
Provider: n.Config.Provider,
Dependencies: stateDeps,
State: &state,
},
&EvalWriteDiff{
Name: stateId,
Diff: &diff,
},
},
}
}
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