Initial transfer of provider code

[github/fretlink/terraform-provider-statuscake.git] / vendor / github.com / hashicorp / terraform / terraform / node_resource_destroy.go

package terraform

import (
        "fmt"

        "github.com/hashicorp/terraform/config"
)

// NodeDestroyResource represents a resource that is to be destroyed.
type NodeDestroyResource struct {
        *NodeAbstractResource
}

func (n *NodeDestroyResource) Name() string {
        return n.NodeAbstractResource.Name() + " (destroy)"
}

// GraphNodeDestroyer
func (n *NodeDestroyResource) DestroyAddr() *ResourceAddress {
        return n.Addr
}

// GraphNodeDestroyerCBD
func (n *NodeDestroyResource) CreateBeforeDestroy() bool {
        // If we have no config, we just assume no
        if n.Config == nil {
                return false
        }

        return n.Config.Lifecycle.CreateBeforeDestroy
}

// GraphNodeDestroyerCBD
func (n *NodeDestroyResource) ModifyCreateBeforeDestroy(v bool) error {
        // If we have no config, do nothing since it won't affect the
        // create step anyways.
        if n.Config == nil {
                return nil
        }

        // Set CBD to true
        n.Config.Lifecycle.CreateBeforeDestroy = true

        return nil
}

// GraphNodeReferenceable, overriding NodeAbstractResource
func (n *NodeDestroyResource) ReferenceableName() []string {
        // We modify our referenceable name to have the suffix of ".destroy"
        // since depending on the creation side doesn't necessarilly mean
        // depending on destruction.
        suffix := ".destroy"

        // If we're CBD, we also append "-cbd". This is because CBD will setup
        // its own edges (in CBDEdgeTransformer). Depending on the "destroy"
        // side generally doesn't mean depending on CBD as well. See GH-11349
        if n.CreateBeforeDestroy() {
                suffix += "-cbd"
        }

        result := n.NodeAbstractResource.ReferenceableName()
        for i, v := range result {
                result[i] = v + suffix
        }

        return result
}

// GraphNodeReferencer, overriding NodeAbstractResource
func (n *NodeDestroyResource) References() []string {
        // If we have a config, then we need to include destroy-time dependencies
        if c := n.Config; c != nil {
                var result []string
                for _, p := range c.Provisioners {
                        // We include conn info and config for destroy time provisioners
                        // as dependencies that we have.
                        if p.When == config.ProvisionerWhenDestroy {
                                result = append(result, ReferencesFromConfig(p.ConnInfo)...)
                                result = append(result, ReferencesFromConfig(p.RawConfig)...)
                        }
                }

                return result
        }

        return nil
}

// GraphNodeDynamicExpandable
func (n *NodeDestroyResource) DynamicExpand(ctx EvalContext) (*Graph, error) {
        // If we have no config we do nothing
        if n.Addr == nil {
                return nil, nil
        }

        state, lock := ctx.State()
        lock.RLock()
        defer lock.RUnlock()

        // Start creating the steps
        steps := make([]GraphTransformer, 0, 5)

        // We want deposed resources in the state to be destroyed
        steps = append(steps, &DeposedTransformer{
                State: state,
                View:  n.Addr.stateId(),
        })

        // Target
        steps = append(steps, &TargetsTransformer{
                ParsedTargets: n.Targets,
        })

        // Always end with the root being added
        steps = append(steps, &RootTransformer{})

        // Build the graph
        b := &BasicGraphBuilder{
                Steps: steps,
                Name:  "NodeResourceDestroy",
        }
        return b.Build(ctx.Path())
}

// GraphNodeEvalable
func (n *NodeDestroyResource) EvalTree() EvalNode {
        // stateId is the ID to put into the state
        stateId := n.Addr.stateId()

        // Build the instance info. More of this will be populated during eval
        info := &InstanceInfo{
                Id:          stateId,
                Type:        n.Addr.Type,
                uniqueExtra: "destroy",
        }

        // Build the resource for eval
        addr := n.Addr
        resource := &Resource{
                Name:       addr.Name,
                Type:       addr.Type,
                CountIndex: addr.Index,
        }
        if resource.CountIndex < 0 {
                resource.CountIndex = 0
        }

        // Get our state
        rs := n.ResourceState
        if rs == nil {
                rs = &ResourceState{}
        }

        var diffApply *InstanceDiff
        var provider ResourceProvider
        var state *InstanceState
        var err error
        return &EvalOpFilter{
                Ops: []walkOperation{walkApply, walkDestroy},
                Node: &EvalSequence{
                        Nodes: []EvalNode{
                                // Get the saved diff for apply
                                &EvalReadDiff{
                                        Name: 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.GetDestroy() {
                                                        return true, nil
                                                }

                                                return true, EvalEarlyExitError{}
                                        },
                                        Then: EvalNoop{},
                                },

                                // Load the instance info so we have the module path set
                                &EvalInstanceInfo{Info: info},

                                &EvalGetProvider{
                                        Name:   n.ProvidedBy()[0],
                                        Output: &provider,
                                },
                                &EvalReadState{
                                        Name:   stateId,
                                        Output: &state,
                                },
                                &EvalRequireState{
                                        State: &state,
                                },

                                // Call pre-apply hook
                                &EvalApplyPre{
                                        Info:  info,
                                        State: &state,
                                        Diff:  &diffApply,
                                },

                                // Run destroy provisioners if not tainted
                                &EvalIf{
                                        If: func(ctx EvalContext) (bool, error) {
                                                if state != nil && state.Tainted {
                                                        return false, nil
                                                }

                                                return true, nil
                                        },

                                        Then: &EvalApplyProvisioners{
                                                Info:           info,
                                                State:          &state,
                                                Resource:       n.Config,
                                                InterpResource: resource,
                                                Error:          &err,
                                                When:           config.ProvisionerWhenDestroy,
                                        },
                                },

                                // If we have a provisioning error, then we just call
                                // the post-apply hook now.
                                &EvalIf{
                                        If: func(ctx EvalContext) (bool, error) {
                                                return err != nil, nil
                                        },

                                        Then: &EvalApplyPost{
                                                Info:  info,
                                                State: &state,
                                                Error: &err,
                                        },
                                },

                                // Make sure we handle data sources properly.
                                &EvalIf{
                                        If: func(ctx EvalContext) (bool, error) {
                                                if n.Addr == nil {
                                                        return false, fmt.Errorf("nil address")
                                                }

                                                if n.Addr.Mode == config.DataResourceMode {
                                                        return true, nil
                                                }

                                                return false, nil
                                        },

                                        Then: &EvalReadDataApply{
                                                Info:     info,
                                                Diff:     &diffApply,
                                                Provider: &provider,
                                                Output:   &state,
                                        },
                                        Else: &EvalApply{
                                                Info:     info,
                                                State:    &state,
                                                Diff:     &diffApply,
                                                Provider: &provider,
                                                Output:   &state,
                                                Error:    &err,
                                        },
                                },
                                &EvalWriteState{
                                        Name:         stateId,
                                        ResourceType: n.Addr.Type,
                                        Provider:     rs.Provider,
                                        Dependencies: rs.Dependencies,
                                        State:        &state,
                                },
                                &EvalApplyPost{
                                        Info:  info,
                                        State: &state,
                                        Error: &err,
                                },
                                &EvalUpdateStateHook{},
                        },
                },
        }
}