terraform/terraform/transform_config.go

124 lines
3.0 KiB
Go

package terraform
import (
"errors"
"fmt"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/config/module"
)
// ConfigTransformer is a GraphTransformer that adds the configuration
// to the graph. The module used to configure this transformer must be
// the root module. We'll look up the child module by the Path in the
// Graph.
type ConfigTransformer struct {
Module *module.Tree
}
func (t *ConfigTransformer) Transform(g *Graph) error {
// A module is required and also must be completely loaded.
if t.Module == nil {
return errors.New("module must not be nil")
}
if !t.Module.Loaded() {
return errors.New("module must be loaded")
}
// Get the module we care about
module := t.Module.Child(g.Path[1:])
if module == nil {
return nil
}
// Get the configuration for this module
config := module.Config()
// Create the node list we'll use for the graph
nodes := make([]graphNodeConfig, 0,
(len(config.Variables)+
len(config.ProviderConfigs)+
len(config.Modules)+
len(config.Resources)+
len(config.Outputs))*2)
// Write all the variables out
for _, v := range config.Variables {
nodes = append(nodes, &GraphNodeConfigVariable{
Variable: v,
ModuleTree: t.Module,
ModulePath: g.Path,
})
}
// Write all the provider configs out
for _, pc := range config.ProviderConfigs {
nodes = append(nodes, &GraphNodeConfigProvider{Provider: pc})
}
// Write all the resources out
for _, r := range config.Resources {
nodes = append(nodes, &GraphNodeConfigResource{
Resource: r,
Path: g.Path,
})
}
// Write all the modules out
children := module.Children()
for _, m := range config.Modules {
path := make([]string, len(g.Path), len(g.Path)+1)
copy(path, g.Path)
path = append(path, m.Name)
nodes = append(nodes, &GraphNodeConfigModule{
Path: path,
Module: m,
Tree: children[m.Name],
})
}
// Write all the outputs out
for _, o := range config.Outputs {
nodes = append(nodes, &GraphNodeConfigOutput{Output: o})
}
// Err is where the final error value will go if there is one
var err error
// Build the graph vertices
for _, n := range nodes {
g.Add(n)
}
// Build up the dependencies. We have to do this outside of the above
// loop since the nodes need to be in place for us to build the deps.
for _, n := range nodes {
if missing := g.ConnectDependent(n); len(missing) > 0 {
for _, m := range missing {
err = multierror.Append(err, fmt.Errorf(
"%s: missing dependency: %s", n.Name(), m))
}
}
}
return err
}
// varNameForVar returns the VarName value for an interpolated variable.
// This value is compared to the VarName() value for the nodes within the
// graph to build the graph edges.
func varNameForVar(raw config.InterpolatedVariable) string {
switch v := raw.(type) {
case *config.ModuleVariable:
return fmt.Sprintf("module.%s.output.%s", v.Name, v.Field)
case *config.ResourceVariable:
return v.ResourceId()
case *config.UserVariable:
return fmt.Sprintf("var.%s", v.Name)
default:
return ""
}
}