terraform/configs/configupgrade/analysis.go

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package configupgrade
import (
"fmt"
"log"
hcl1 "github.com/hashicorp/hcl"
hcl1ast "github.com/hashicorp/hcl/hcl/ast"
hcl1parser "github.com/hashicorp/hcl/hcl/parser"
hcl1token "github.com/hashicorp/hcl/hcl/token"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/moduledeps"
"github.com/hashicorp/terraform/plugin/discovery"
"github.com/hashicorp/terraform/terraform"
)
// analysis is a container for the various different information gathered
// by Upgrader.analyze.
type analysis struct {
ProviderSchemas map[string]*terraform.ProviderSchema
ProvisionerSchemas map[string]*configschema.Block
ResourceProviderType map[addrs.Resource]string
ResourceHasCount map[addrs.Resource]bool
}
// analyze processes the configuration files included inside the receiver
// and returns an assortment of information required to make decisions during
// a configuration upgrade.
func (u *Upgrader) analyze(ms ModuleSources) (*analysis, error) {
ret := &analysis{
ProviderSchemas: make(map[string]*terraform.ProviderSchema),
ProvisionerSchemas: make(map[string]*configschema.Block),
ResourceProviderType: make(map[addrs.Resource]string),
ResourceHasCount: make(map[addrs.Resource]bool),
}
m := &moduledeps.Module{
Providers: make(moduledeps.Providers),
}
// This is heavily based on terraform.ModuleTreeDependencies but
// differs in that it works directly with the HCL1 AST rather than
// the legacy config structs (and can thus outlive those) and that
// it only works on one module at a time, and so doesn't need to
// recurse into child calls.
for name, src := range ms {
if ext := fileExt(name); ext != ".tf" {
continue
}
log.Printf("[TRACE] configupgrade: Analyzing %q", name)
f, err := hcl1parser.Parse(src)
if err != nil {
// If we encounter a syntax error then we'll just skip for now
// and assume that we'll catch this again when we do the upgrade.
// If not, we'll break the upgrade step of renaming .tf files to
// .tf.json if they seem to be JSON syntax.
log.Printf("[ERROR] Failed to parse %q: %s", name, err)
continue
}
list, ok := f.Node.(*hcl1ast.ObjectList)
if !ok {
return nil, fmt.Errorf("error parsing: file doesn't contain a root object")
}
if providersList := list.Filter("provider"); len(providersList.Items) > 0 {
providerObjs := providersList.Children()
for _, providerObj := range providerObjs.Items {
if len(providerObj.Keys) != 1 {
return nil, fmt.Errorf("provider block has wrong number of labels")
}
name := providerObj.Keys[0].Token.Value().(string)
var listVal *hcl1ast.ObjectList
if ot, ok := providerObj.Val.(*hcl1ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("provider %q: must be a block", name)
}
var versionStr string
if a := listVal.Filter("version"); len(a.Items) > 0 {
err := hcl1.DecodeObject(&versionStr, a.Items[0].Val)
if err != nil {
return nil, fmt.Errorf("Error reading version for provider %q: %s", name, err)
}
}
var constraints discovery.Constraints
if versionStr != "" {
constraints, err = discovery.ConstraintStr(versionStr).Parse()
if err != nil {
return nil, fmt.Errorf("Error parsing version for provider %q: %s", name, err)
}
}
var alias string
if a := listVal.Filter("alias"); len(a.Items) > 0 {
err := hcl1.DecodeObject(&alias, a.Items[0].Val)
if err != nil {
return nil, fmt.Errorf("Error reading alias for provider %q: %s", name, err)
}
}
inst := moduledeps.ProviderInstance(name)
if alias != "" {
inst = moduledeps.ProviderInstance(name + "." + alias)
}
log.Printf("[TRACE] Provider block requires provider %q", inst)
m.Providers[inst] = moduledeps.ProviderDependency{
Constraints: constraints,
Reason: moduledeps.ProviderDependencyExplicit,
}
}
}
{
resourceConfigsList := list.Filter("resource")
dataResourceConfigsList := list.Filter("data")
// list.Filter annoyingly strips off the key used for matching,
// so we'll put it back here so we can distinguish our two types
// of blocks below.
for _, obj := range resourceConfigsList.Items {
obj.Keys = append([]*hcl1ast.ObjectKey{
{Token: hcl1token.Token{Type: hcl1token.IDENT, Text: "resource"}},
}, obj.Keys...)
}
for _, obj := range dataResourceConfigsList.Items {
obj.Keys = append([]*hcl1ast.ObjectKey{
{Token: hcl1token.Token{Type: hcl1token.IDENT, Text: "data"}},
}, obj.Keys...)
}
// Now we can merge the two lists together, since we can distinguish
// them just by their keys[0].
resourceConfigsList.Items = append(resourceConfigsList.Items, dataResourceConfigsList.Items...)
resourceObjs := resourceConfigsList.Children()
for _, resourceObj := range resourceObjs.Items {
if len(resourceObj.Keys) != 3 {
return nil, fmt.Errorf("resource or data block has wrong number of labels")
}
typeName := resourceObj.Keys[1].Token.Value().(string)
name := resourceObj.Keys[2].Token.Value().(string)
rAddr := addrs.Resource{
Mode: addrs.ManagedResourceMode,
Type: typeName,
Name: name,
}
if resourceObj.Keys[0].Token.Value() == "data" {
rAddr.Mode = addrs.DataResourceMode
}
var listVal *hcl1ast.ObjectList
if ot, ok := resourceObj.Val.(*hcl1ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("config for %q must be a block", rAddr)
}
if o := listVal.Filter("count"); len(o.Items) > 0 {
ret.ResourceHasCount[rAddr] = true
} else {
ret.ResourceHasCount[rAddr] = false
}
var providerKey string
if o := listVal.Filter("provider"); len(o.Items) > 0 {
err := hcl1.DecodeObject(&providerKey, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf("Error reading provider for resource %s: %s", rAddr, err)
}
}
if providerKey == "" {
providerKey = rAddr.DefaultProviderConfig().StringCompact()
}
inst := moduledeps.ProviderInstance(providerKey)
log.Printf("[TRACE] Resource block for %s requires provider %q", rAddr, inst)
if _, exists := m.Providers[inst]; !exists {
m.Providers[inst] = moduledeps.ProviderDependency{
Reason: moduledeps.ProviderDependencyImplicit,
}
}
ret.ResourceProviderType[rAddr] = inst.Type()
}
}
}
providerFactories, err := u.Providers.ResolveProviders(m.PluginRequirements())
if err != nil {
return nil, fmt.Errorf("error resolving providers: %s", err)
}
for name, fn := range providerFactories {
log.Printf("[TRACE] Fetching schema from provider %q", name)
provider, err := fn()
if err != nil {
return nil, fmt.Errorf("failed to load provider %q: %s", name, err)
}
resp := provider.GetSchema()
if resp.Diagnostics.HasErrors() {
return nil, resp.Diagnostics.Err()
}
schema := &terraform.ProviderSchema{
Provider: resp.Provider.Block,
ResourceTypes: map[string]*configschema.Block{},
DataSources: map[string]*configschema.Block{},
}
for t, s := range resp.ResourceTypes {
schema.ResourceTypes[t] = s.Block
}
for t, s := range resp.DataSources {
schema.DataSources[t] = s.Block
}
ret.ProviderSchemas[name] = schema
}
// TODO: Also ProvisionerSchemas
return ret, nil
}