668 lines
15 KiB
Go
668 lines
15 KiB
Go
package terraform
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import (
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"fmt"
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"strings"
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"github.com/hashicorp/terraform/config"
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"github.com/hashicorp/terraform/dag"
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)
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// ResourceCountTransformer is a GraphTransformer that expands the count
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// out for a specific resource.
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type ResourceCountTransformer struct {
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Resource *config.Resource
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Destroy bool
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Targets []ResourceAddress
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}
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func (t *ResourceCountTransformer) Transform(g *Graph) error {
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// Expand the resource count
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count, err := t.Resource.Count()
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if err != nil {
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return err
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}
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// Don't allow the count to be negative
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if count < 0 {
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return fmt.Errorf("negative count: %d", count)
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}
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// For each count, build and add the node
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nodes := make([]dag.Vertex, 0, count)
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for i := 0; i < count; i++ {
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// Set the index. If our count is 1 we special case it so that
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// we handle the "resource.0" and "resource" boundary properly.
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index := i
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if count == 1 {
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index = -1
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}
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// Save the node for later so we can do connections. Make the
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// proper node depending on if we're just a destroy node or if
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// were a regular node.
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var node dag.Vertex = &graphNodeExpandedResource{
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Index: index,
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Resource: t.Resource,
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Path: g.Path,
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}
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if t.Destroy {
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node = &graphNodeExpandedResourceDestroy{
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graphNodeExpandedResource: node.(*graphNodeExpandedResource),
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}
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}
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// Skip nodes if targeting excludes them
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if !t.nodeIsTargeted(node) {
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continue
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}
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// Add the node now
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nodes = append(nodes, node)
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g.Add(node)
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}
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// Make the dependency connections
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for _, n := range nodes {
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// Connect the dependents. We ignore the return value for missing
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// dependents since that should've been caught at a higher level.
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g.ConnectDependent(n)
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}
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return nil
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}
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func (t *ResourceCountTransformer) nodeIsTargeted(node dag.Vertex) bool {
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// no targets specified, everything stays in the graph
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if len(t.Targets) == 0 {
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return true
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}
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addressable, ok := node.(GraphNodeAddressable)
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if !ok {
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return false
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}
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addr := addressable.ResourceAddress()
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for _, targetAddr := range t.Targets {
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if targetAddr.Equals(addr) {
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return true
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}
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}
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return false
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}
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type graphNodeExpandedResource struct {
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Index int
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Resource *config.Resource
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Path []string
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}
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func (n *graphNodeExpandedResource) Name() string {
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if n.Index == -1 {
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return n.Resource.Id()
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}
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return fmt.Sprintf("%s #%d", n.Resource.Id(), n.Index)
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}
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// GraphNodeAddressable impl.
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func (n *graphNodeExpandedResource) ResourceAddress() *ResourceAddress {
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// We want this to report the logical index properly, so we must undo the
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// special case from the expand
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index := n.Index
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if index == -1 {
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index = 0
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}
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return &ResourceAddress{
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Path: n.Path[1:],
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Index: index,
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InstanceType: TypePrimary,
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Name: n.Resource.Name,
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Type: n.Resource.Type,
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}
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}
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// graphNodeConfig impl.
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func (n *graphNodeExpandedResource) ConfigType() GraphNodeConfigType {
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return GraphNodeConfigTypeResource
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}
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// GraphNodeDependable impl.
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func (n *graphNodeExpandedResource) DependableName() []string {
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return []string{
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n.Resource.Id(),
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n.stateId(),
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}
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}
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// GraphNodeDependent impl.
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func (n *graphNodeExpandedResource) DependentOn() []string {
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configNode := &GraphNodeConfigResource{Resource: n.Resource}
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result := configNode.DependentOn()
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// Walk the variables to find any count-specific variables we depend on.
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configNode.VarWalk(func(v config.InterpolatedVariable) {
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rv, ok := v.(*config.ResourceVariable)
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if !ok {
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return
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}
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// We only want ourselves
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if rv.ResourceId() != n.Resource.Id() {
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return
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}
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// If this isn't a multi-access (which shouldn't be allowed but
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// is verified elsewhere), then we depend on the specific count
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// of this resource, ignoring ourself (which again should be
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// validated elsewhere).
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if rv.Index > -1 {
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id := fmt.Sprintf("%s.%d", rv.ResourceId(), rv.Index)
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if id != n.stateId() && id != n.stateId()+".0" {
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result = append(result, id)
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}
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}
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})
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return result
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}
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// GraphNodeProviderConsumer
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func (n *graphNodeExpandedResource) ProvidedBy() []string {
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return []string{resourceProvider(n.Resource.Type, n.Resource.Provider)}
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}
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func (n *graphNodeExpandedResource) StateDependencies() []string {
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depsRaw := n.DependentOn()
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deps := make([]string, 0, len(depsRaw))
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for _, d := range depsRaw {
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// Ignore any variable dependencies
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if strings.HasPrefix(d, "var.") {
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continue
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}
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// This is sad. The dependencies are currently in the format of
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// "module.foo.bar" (the full field). This strips the field off.
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if strings.HasPrefix(d, "module.") {
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parts := strings.SplitN(d, ".", 3)
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d = strings.Join(parts[0:2], ".")
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}
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deps = append(deps, d)
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}
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return deps
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}
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// GraphNodeEvalable impl.
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func (n *graphNodeExpandedResource) EvalTree() EvalNode {
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var diff *InstanceDiff
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var provider ResourceProvider
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var resourceConfig *ResourceConfig
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var state *InstanceState
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// Build the resource. If we aren't part of a multi-resource, then
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// we still consider ourselves as count index zero.
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index := n.Index
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if index < 0 {
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index = 0
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}
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resource := &Resource{
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Name: n.Resource.Name,
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Type: n.Resource.Type,
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CountIndex: index,
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}
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seq := &EvalSequence{Nodes: make([]EvalNode, 0, 5)}
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// Validate the resource
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vseq := &EvalSequence{Nodes: make([]EvalNode, 0, 5)}
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vseq.Nodes = append(vseq.Nodes, &EvalGetProvider{
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Name: n.ProvidedBy()[0],
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Output: &provider,
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})
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vseq.Nodes = append(vseq.Nodes, &EvalInterpolate{
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Config: n.Resource.RawConfig.Copy(),
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Resource: resource,
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Output: &resourceConfig,
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})
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vseq.Nodes = append(vseq.Nodes, &EvalValidateResource{
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Provider: &provider,
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Config: &resourceConfig,
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ResourceName: n.Resource.Name,
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ResourceType: n.Resource.Type,
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})
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// Validate all the provisioners
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for _, p := range n.Resource.Provisioners {
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var provisioner ResourceProvisioner
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vseq.Nodes = append(vseq.Nodes, &EvalGetProvisioner{
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Name: p.Type,
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Output: &provisioner,
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}, &EvalInterpolate{
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Config: p.RawConfig.Copy(),
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Resource: resource,
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Output: &resourceConfig,
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}, &EvalValidateProvisioner{
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Provisioner: &provisioner,
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Config: &resourceConfig,
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})
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}
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// Add the validation operations
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seq.Nodes = append(seq.Nodes, &EvalOpFilter{
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Ops: []walkOperation{walkValidate},
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Node: vseq,
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})
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// Build instance info
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info := n.instanceInfo()
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seq.Nodes = append(seq.Nodes, &EvalInstanceInfo{Info: info})
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// Refresh the resource
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seq.Nodes = append(seq.Nodes, &EvalOpFilter{
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Ops: []walkOperation{walkRefresh},
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Node: &EvalSequence{
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Nodes: []EvalNode{
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&EvalGetProvider{
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Name: n.ProvidedBy()[0],
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Output: &provider,
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},
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&EvalReadState{
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Name: n.stateId(),
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Output: &state,
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},
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&EvalRefresh{
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Info: info,
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Provider: &provider,
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State: &state,
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Output: &state,
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},
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&EvalWriteState{
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Name: n.stateId(),
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ResourceType: n.Resource.Type,
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Provider: n.Resource.Provider,
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Dependencies: n.StateDependencies(),
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State: &state,
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},
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},
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},
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})
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// Diff the resource
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seq.Nodes = append(seq.Nodes, &EvalOpFilter{
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Ops: []walkOperation{walkPlan},
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Node: &EvalSequence{
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Nodes: []EvalNode{
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&EvalInterpolate{
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Config: n.Resource.RawConfig.Copy(),
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Resource: resource,
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Output: &resourceConfig,
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},
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&EvalGetProvider{
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Name: n.ProvidedBy()[0],
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Output: &provider,
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},
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&EvalReadState{
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Name: n.stateId(),
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Output: &state,
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},
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&EvalDiff{
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Info: info,
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Config: &resourceConfig,
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Provider: &provider,
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State: &state,
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Output: &diff,
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OutputState: &state,
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},
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&EvalCheckPreventDestroy{
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Resource: n.Resource,
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Diff: &diff,
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},
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&EvalIgnoreChanges{
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Resource: n.Resource,
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Diff: &diff,
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},
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&EvalWriteState{
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Name: n.stateId(),
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ResourceType: n.Resource.Type,
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Provider: n.Resource.Provider,
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Dependencies: n.StateDependencies(),
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State: &state,
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},
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&EvalDiffTainted{
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Diff: &diff,
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Name: n.stateId(),
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},
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&EvalWriteDiff{
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Name: n.stateId(),
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Diff: &diff,
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},
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},
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},
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})
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// Diff the resource for destruction
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seq.Nodes = append(seq.Nodes, &EvalOpFilter{
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Ops: []walkOperation{walkPlanDestroy},
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Node: &EvalSequence{
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Nodes: []EvalNode{
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&EvalReadState{
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Name: n.stateId(),
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Output: &state,
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},
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&EvalDiffDestroy{
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Info: info,
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State: &state,
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Output: &diff,
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},
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&EvalCheckPreventDestroy{
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Resource: n.Resource,
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Diff: &diff,
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},
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&EvalWriteDiff{
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Name: n.stateId(),
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Diff: &diff,
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},
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},
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},
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})
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// Apply
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var diffApply *InstanceDiff
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var err error
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var createNew, tainted bool
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var createBeforeDestroyEnabled bool
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var wasChangeType DiffChangeType
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seq.Nodes = append(seq.Nodes, &EvalOpFilter{
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Ops: []walkOperation{walkApply, walkDestroy},
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Node: &EvalSequence{
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Nodes: []EvalNode{
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// Get the saved diff for apply
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&EvalReadDiff{
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Name: n.stateId(),
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Diff: &diffApply,
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},
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// We don't want to do any destroys
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&EvalIf{
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If: func(ctx EvalContext) (bool, error) {
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if diffApply == nil {
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return true, EvalEarlyExitError{}
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}
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if diffApply.Destroy && len(diffApply.Attributes) == 0 {
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return true, EvalEarlyExitError{}
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}
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wasChangeType = diffApply.ChangeType()
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diffApply.Destroy = false
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return true, nil
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},
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Then: EvalNoop{},
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},
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&EvalIf{
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If: func(ctx EvalContext) (bool, error) {
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destroy := false
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if diffApply != nil {
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destroy = diffApply.Destroy || diffApply.RequiresNew()
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}
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createBeforeDestroyEnabled =
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n.Resource.Lifecycle.CreateBeforeDestroy &&
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destroy
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return createBeforeDestroyEnabled, nil
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},
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Then: &EvalDeposeState{
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Name: n.stateId(),
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},
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},
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&EvalInterpolate{
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Config: n.Resource.RawConfig.Copy(),
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Resource: resource,
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Output: &resourceConfig,
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},
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&EvalGetProvider{
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Name: n.ProvidedBy()[0],
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Output: &provider,
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},
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&EvalReadState{
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Name: n.stateId(),
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Output: &state,
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},
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&EvalDiff{
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Info: info,
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Config: &resourceConfig,
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Provider: &provider,
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State: &state,
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Output: &diffApply,
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},
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&EvalIgnoreChanges{
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Resource: n.Resource,
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Diff: &diffApply,
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WasChangeType: &wasChangeType,
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},
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// Get the saved diff
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&EvalReadDiff{
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Name: n.stateId(),
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Diff: &diff,
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},
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// Compare the diffs
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&EvalCompareDiff{
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Info: info,
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One: &diff,
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Two: &diffApply,
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},
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&EvalGetProvider{
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Name: n.ProvidedBy()[0],
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Output: &provider,
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},
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&EvalReadState{
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Name: n.stateId(),
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Output: &state,
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},
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&EvalApply{
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Info: info,
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State: &state,
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Diff: &diffApply,
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Provider: &provider,
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Output: &state,
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Error: &err,
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CreateNew: &createNew,
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},
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&EvalWriteState{
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Name: n.stateId(),
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ResourceType: n.Resource.Type,
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Provider: n.Resource.Provider,
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Dependencies: n.StateDependencies(),
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State: &state,
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},
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&EvalApplyProvisioners{
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Info: info,
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State: &state,
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Resource: n.Resource,
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InterpResource: resource,
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CreateNew: &createNew,
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Tainted: &tainted,
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Error: &err,
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},
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&EvalIf{
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If: func(ctx EvalContext) (bool, error) {
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if createBeforeDestroyEnabled {
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tainted = err != nil
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}
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failure := tainted || err != nil
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return createBeforeDestroyEnabled && failure, nil
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},
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Then: &EvalUndeposeState{
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Name: n.stateId(),
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},
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},
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// We clear the diff out here so that future nodes
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// don't see a diff that is already complete. There
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// is no longer a diff!
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&EvalWriteDiff{
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Name: n.stateId(),
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Diff: nil,
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},
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&EvalIf{
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If: func(ctx EvalContext) (bool, error) {
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return tainted, nil
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},
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Then: &EvalSequence{
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Nodes: []EvalNode{
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&EvalWriteStateTainted{
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Name: n.stateId(),
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ResourceType: n.Resource.Type,
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Provider: n.Resource.Provider,
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Dependencies: n.StateDependencies(),
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State: &state,
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Index: -1,
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},
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&EvalIf{
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If: func(ctx EvalContext) (bool, error) {
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return !n.Resource.Lifecycle.CreateBeforeDestroy, nil
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},
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Then: &EvalClearPrimaryState{
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Name: n.stateId(),
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},
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},
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},
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},
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Else: &EvalWriteState{
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Name: n.stateId(),
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ResourceType: n.Resource.Type,
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Provider: n.Resource.Provider,
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Dependencies: n.StateDependencies(),
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State: &state,
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},
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},
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&EvalApplyPost{
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Info: info,
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State: &state,
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Error: &err,
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},
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&EvalUpdateStateHook{},
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},
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},
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})
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return seq
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}
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|
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// instanceInfo is used for EvalTree.
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func (n *graphNodeExpandedResource) instanceInfo() *InstanceInfo {
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return &InstanceInfo{Id: n.stateId(), Type: n.Resource.Type}
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}
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// stateId is the name used for the state key
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func (n *graphNodeExpandedResource) stateId() string {
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if n.Index == -1 {
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return n.Resource.Id()
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}
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return fmt.Sprintf("%s.%d", n.Resource.Id(), n.Index)
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}
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|
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// GraphNodeStateRepresentative impl.
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func (n *graphNodeExpandedResource) StateId() []string {
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return []string{n.stateId()}
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}
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|
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// graphNodeExpandedResourceDestroy represents an expanded resource that
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// is to be destroyed.
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type graphNodeExpandedResourceDestroy struct {
|
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*graphNodeExpandedResource
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}
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|
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func (n *graphNodeExpandedResourceDestroy) Name() string {
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return fmt.Sprintf("%s (destroy)", n.graphNodeExpandedResource.Name())
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}
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|
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// graphNodeConfig impl.
|
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func (n *graphNodeExpandedResourceDestroy) ConfigType() GraphNodeConfigType {
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return GraphNodeConfigTypeResource
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}
|
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|
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// GraphNodeEvalable impl.
|
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func (n *graphNodeExpandedResourceDestroy) EvalTree() EvalNode {
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info := n.instanceInfo()
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|
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var diffApply *InstanceDiff
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var provider ResourceProvider
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var state *InstanceState
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var err error
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return &EvalOpFilter{
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Ops: []walkOperation{walkApply, walkDestroy},
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Node: &EvalSequence{
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Nodes: []EvalNode{
|
|
// Get the saved diff for apply
|
|
&EvalReadDiff{
|
|
Name: n.stateId(),
|
|
Diff: &diffApply,
|
|
},
|
|
|
|
// Filter the diff so we only get the destroy
|
|
&EvalFilterDiff{
|
|
Diff: &diffApply,
|
|
Output: &diffApply,
|
|
Destroy: true,
|
|
},
|
|
|
|
// If we're not destroying, then compare diffs
|
|
&EvalIf{
|
|
If: func(ctx EvalContext) (bool, error) {
|
|
if diffApply != nil && diffApply.Destroy {
|
|
return true, nil
|
|
}
|
|
|
|
return true, EvalEarlyExitError{}
|
|
},
|
|
Then: EvalNoop{},
|
|
},
|
|
|
|
&EvalGetProvider{
|
|
Name: n.ProvidedBy()[0],
|
|
Output: &provider,
|
|
},
|
|
&EvalReadState{
|
|
Name: n.stateId(),
|
|
Output: &state,
|
|
},
|
|
&EvalRequireState{
|
|
State: &state,
|
|
},
|
|
&EvalApply{
|
|
Info: info,
|
|
State: &state,
|
|
Diff: &diffApply,
|
|
Provider: &provider,
|
|
Output: &state,
|
|
Error: &err,
|
|
},
|
|
&EvalWriteState{
|
|
Name: n.stateId(),
|
|
ResourceType: n.Resource.Type,
|
|
Provider: n.Resource.Provider,
|
|
Dependencies: n.StateDependencies(),
|
|
State: &state,
|
|
},
|
|
&EvalApplyPost{
|
|
Info: info,
|
|
State: &state,
|
|
Error: &err,
|
|
},
|
|
},
|
|
},
|
|
}
|
|
}
|