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package terraform
import (
"log"
"sync"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/dag"
)
// ConfigTransformer is a GraphTransformer that adds all the resources
// from the configuration to the graph.
//
// The module used to configure this transformer must be the root module.
//
// Only resources are added to the graph. Variables, outputs, and
// providers must be added via other transforms.
//
// Unlike ConfigTransformerOld, this transformer creates a graph with
// all resources including module resources, rather than creating module
// nodes that are then "flattened".
type ConfigTransformer struct {
Concrete ConcreteResourceNodeFunc
// Module is the module to add resources from.
Config *configs.Config
// Unique will only add resources that aren't already present in the graph.
Unique bool
// Mode will only add resources that match the given mode
ModeFilter bool
Mode addrs.ResourceMode
l sync.Mutex
uniqueMap map[string]struct{}
}
func (t *ConfigTransformer) Transform(g *Graph) error {
// Lock since we use some internal state
t.l.Lock()
defer t.l.Unlock()
// If no configuration is available, we don't do anything
if t.Config == nil {
return nil
}
// Reset the uniqueness map. If we're tracking uniques, then populate
// it with addresses.
t.uniqueMap = make(map[string]struct{})
defer func() { t.uniqueMap = nil }()
if t.Unique {
for _, v := range g.Vertices() {
if rn, ok := v.(GraphNodeResource); ok {
t.uniqueMap[rn.ResourceAddr().String()] = struct{}{}
}
}
}
// Start the transformation process
return t.transform(g, t.Config)
}
func (t *ConfigTransformer) transform(g *Graph, config *configs.Config) error {
// If no config, do nothing
if config == nil {
return nil
}
// Add our resources
if err := t.transformSingle(g, config); err != nil {
return err
}
// Transform all the children.
for _, c := range config.Children {
if err := t.transform(g, c); err != nil {
return err
}
}
return nil
}
func (t *ConfigTransformer) transformSingle(g *Graph, config *configs.Config) error {
path := config.Path
module := config.Module
log.Printf("[TRACE] ConfigTransformer: Starting for path: %v", path)
// For now we assume that each module call produces only one module
// instance with no key, since we don't yet support "count" and "for_each"
// on modules.
// FIXME: As part of supporting "count" and "for_each" on modules, rework
// this so that we'll "expand" the module call first and then create graph
// nodes for each module instance separately.
instPath := path.UnkeyedInstanceShim()
allResources := make([]*configs.Resource, 0, len(module.ManagedResources)+len(module.DataResources))
for _, r := range module.ManagedResources {
allResources = append(allResources, r)
}
for _, r := range module.DataResources {
allResources = append(allResources, r)
}
for _, r := range allResources {
relAddr := r.Addr()
if t.ModeFilter && relAddr.Mode != t.Mode {
// Skip non-matching modes
continue
}
addr := relAddr.Absolute(instPath)
if _, ok := t.uniqueMap[addr.String()]; ok {
// We've already seen a resource with this address. This should
// never happen, because we enforce uniqueness in the config loader.
continue
}
abstract := &NodeAbstractResource{Addr: addr}
var node dag.Vertex = abstract
if f := t.Concrete; f != nil {
node = f(abstract)
}
g.Add(node)
}
return nil
}
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