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Copy pathnode_resource_apply.go
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323 lines (286 loc) · 7.2 KB
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package terraform
import (
"fmt"
"github.com/hashicorp/terraform/config"
)
// NodeApplyableResource represents a resource that is "applyable":
// it is ready to be applied and is represented by a diff.
type NodeApplyableResource struct {
*NodeAbstractResource
}
// GraphNodeCreator
func (n *NodeApplyableResource) CreateAddr() *ResourceAddress {
return n.NodeAbstractResource.Addr
}
// GraphNodeEvalable
func (n *NodeApplyableResource) EvalTree() EvalNode {
addr := n.NodeAbstractResource.Addr
// stateId is the ID to put into the state
stateId := addr.stateId()
if addr.Index > -1 {
stateId = fmt.Sprintf("%s.%d", stateId, addr.Index)
}
// Build the instance info. More of this will be populated during eval
info := &InstanceInfo{
Id: stateId,
Type: addr.Type,
}
// 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. We use some older
// code for this that we've used for a long time.
var stateDeps []string
{
oldN := &graphNodeExpandedResource{Resource: n.Config}
stateDeps = oldN.StateDependencies()
}
// 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 *NodeApplyableResource) 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{
// Get the saved diff for apply
&EvalReadDiff{
Name: stateId,
Diff: &diff,
},
// Stop here if we don't actually have a diff
&EvalIf{
If: func(ctx EvalContext) (bool, error) {
if diff == nil {
return true, EvalEarlyExitError{}
}
if diff.GetAttributesLen() == 0 {
return true, EvalEarlyExitError{}
}
return true, nil
},
Then: EvalNoop{},
},
// We need to re-interpolate the config here, rather than
// just using the diff's values directly, because we've
// potentially learned more variable values during the
// apply pass that weren't known when the diff was produced.
&EvalInterpolate{
Config: n.Config.RawConfig.Copy(),
Resource: resource,
Output: &config,
},
&EvalGetProvider{
Name: n.ProvidedBy()[0],
Output: &provider,
},
// Make a new diff with our newly-interpolated config.
&EvalReadDataDiff{
Info: info,
Config: &config,
Previous: &diff,
Provider: &provider,
Output: &diff,
},
&EvalReadDataApply{
Info: info,
Diff: &diff,
Provider: &provider,
Output: &state,
},
&EvalWriteState{
Name: stateId,
ResourceType: n.Config.Type,
Provider: n.Config.Provider,
Dependencies: stateDeps,
State: &state,
},
// Clear the diff now that we've applied it, so
// later nodes won't see a diff that's now a no-op.
&EvalWriteDiff{
Name: stateId,
Diff: nil,
},
&EvalUpdateStateHook{},
},
}
}
func (n *NodeApplyableResource) 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, diffApply *InstanceDiff
var state *InstanceState
var resourceConfig *ResourceConfig
var err error
var createNew bool
var createBeforeDestroyEnabled bool
return &EvalSequence{
Nodes: []EvalNode{
// Build the instance info
&EvalInstanceInfo{
Info: info,
},
// Get the saved diff for apply
&EvalReadDiff{
Name: stateId,
Diff: &diffApply,
},
// We don't want to do any destroys
&EvalIf{
If: func(ctx EvalContext) (bool, error) {
if diffApply == nil {
return true, EvalEarlyExitError{}
}
if diffApply.GetDestroy() && diffApply.GetAttributesLen() == 0 {
return true, EvalEarlyExitError{}
}
diffApply.SetDestroy(false)
return true, nil
},
Then: EvalNoop{},
},
&EvalIf{
If: func(ctx EvalContext) (bool, error) {
destroy := false
if diffApply != nil {
destroy = diffApply.GetDestroy() || diffApply.RequiresNew()
}
createBeforeDestroyEnabled =
n.Config.Lifecycle.CreateBeforeDestroy &&
destroy
return createBeforeDestroyEnabled, nil
},
Then: &EvalDeposeState{
Name: stateId,
},
},
&EvalInterpolate{
Config: n.Config.RawConfig.Copy(),
Resource: resource,
Output: &resourceConfig,
},
&EvalGetProvider{
Name: n.ProvidedBy()[0],
Output: &provider,
},
&EvalReadState{
Name: stateId,
Output: &state,
},
// 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,
},
&EvalDiff{
Info: info,
Config: &resourceConfig,
Resource: n.Config,
Provider: &provider,
Diff: &diffApply,
State: &state,
OutputDiff: &diffApply,
},
// Get the saved diff
&EvalReadDiff{
Name: stateId,
Diff: &diff,
},
// Compare the diffs
&EvalCompareDiff{
Info: info,
One: &diff,
Two: &diffApply,
},
&EvalGetProvider{
Name: n.ProvidedBy()[0],
Output: &provider,
},
&EvalReadState{
Name: stateId,
Output: &state,
},
&EvalApply{
Info: info,
State: &state,
Diff: &diffApply,
Provider: &provider,
Output: &state,
Error: &err,
CreateNew: &createNew,
},
&EvalWriteState{
Name: stateId,
ResourceType: n.Config.Type,
Provider: n.Config.Provider,
Dependencies: stateDeps,
State: &state,
},
&EvalApplyProvisioners{
Info: info,
State: &state,
Resource: n.Config,
InterpResource: resource,
CreateNew: &createNew,
Error: &err,
},
&EvalIf{
If: func(ctx EvalContext) (bool, error) {
return createBeforeDestroyEnabled && err != nil, nil
},
Then: &EvalUndeposeState{
Name: stateId,
State: &state,
},
Else: &EvalWriteState{
Name: stateId,
ResourceType: n.Config.Type,
Provider: n.Config.Provider,
Dependencies: stateDeps,
State: &state,
},
},
// We clear the diff out here so that future nodes
// don't see a diff that is already complete. There
// is no longer a diff!
&EvalWriteDiff{
Name: stateId,
Diff: nil,
},
&EvalApplyPost{
Info: info,
State: &state,
Error: &err,
},
&EvalUpdateStateHook{},
},
}
}