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gowrapper.go
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gowrapper.go
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// Copyright 2023 Volvo Car Corporation
// SPDX-License-Identifier: Apache-2.0
package terragen
import (
"bytes"
"errors"
"fmt"
"io"
"log/slog"
"os"
"path/filepath"
"strings"
"github.com/golingon/lingon/pkg/internal/terrajen"
"golang.org/x/tools/txtar"
tfjson "github.com/hashicorp/terraform-json"
)
var (
ErrPackageLocationNotEmpty = errors.New(
"providers pkg location is not empty",
)
ErrProviderSchemaNotFound = errors.New("provider schema not found")
)
type GenerateGoArgs struct {
ProviderName string
ProviderSource string
ProviderVersion string
// OutDir is the filesystem location where the generated files will be
// created.
OutDir string
// PkgPath is the Go pkg path to the generated files location, specified by
// OutDir. E.g. if OutDir is in a module called "my-module" in a directory
// called "gen",
// then the PkgPath should be "my-module/gen".
PkgPath string
// Force enables overriding any existing generated files per-provider.
Force bool
// Clean enables cleaning the generated files location before generating the
// new files.
Clean bool
}
// GenerateGoCode generates Go code for creating Terraform objects for the given
// providers and their schemas.
func GenerateGoCode(
args GenerateGoArgs,
providerSchema *tfjson.ProviderSchema,
) error {
if args.OutDir == "" {
return errors.New("outDir is empty")
}
if args.PkgPath == "" {
return errors.New("pkgPath is empty")
}
slog.Info(
"Generating Go wrapper",
slog.String("provider", args.ProviderName),
slog.String("source", args.ProviderSource),
slog.String("version", args.ProviderVersion),
)
providerGenerator := terrajen.ProviderGenerator{
GoProviderPkgPath: args.PkgPath,
GeneratedPackageLocation: args.OutDir,
ProviderName: args.ProviderName,
ProviderSource: args.ProviderSource,
ProviderVersion: args.ProviderVersion,
}
arch, err := generateProviderTxtar(providerGenerator, providerSchema)
if err != nil {
return err
}
if err := createDirIfNotEmpty(args.OutDir, args.Force, args.Clean); err != nil {
return fmt.Errorf(
"creating providers pkg directory %q: %w",
args.OutDir,
err,
)
}
// Write the txtar archive to the filesystem.
if err := writeTxtarArchive(arch); err != nil {
return fmt.Errorf("writing txtar archive: %w", err)
}
return nil
}
func writeTxtarArchive(ar *txtar.Archive) error {
for _, file := range ar.Files {
dir := filepath.Dir(file.Name)
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return fmt.Errorf("creating directory %q: %w", dir, err)
}
if err := os.WriteFile(file.Name, file.Data, 0o644); err != nil {
return fmt.Errorf("writing file %q: %w", file.Name, err)
}
}
return nil
}
func generateProviderTxtar(
provider terrajen.ProviderGenerator,
schema *tfjson.ProviderSchema,
) (*txtar.Archive, error) {
ar := txtar.Archive{}
//
// Generate Provider
//
providerSchema := provider.SchemaProvider(schema.ConfigSchema.Block)
providerFile := terrajen.ProviderFile(providerSchema)
providerBuf := bytes.Buffer{}
if err := providerFile.Render(&providerBuf); err != nil {
terrajen.JenDebug(err)
return nil, fmt.Errorf("rendering provider file: %w", err)
}
ar.Files = append(ar.Files, txtar.File{
Name: providerSchema.FilePath,
Data: providerBuf.Bytes(),
})
subPkgFile, ok := terrajen.SubPkgFile(providerSchema)
if ok {
subPkgBuf := bytes.Buffer{}
if err := subPkgFile.Render(&subPkgBuf); err != nil {
terrajen.JenDebug(err)
return nil, fmt.Errorf("rendering sub package file: %w", err)
}
ar.Files = append(ar.Files, txtar.File{
Name: providerSchema.SubPkgPath,
Data: subPkgBuf.Bytes(),
})
}
//
// Generate Resources
//
for name, resource := range schema.ResourceSchemas {
resourceSchema := provider.SchemaResource(name, resource.Block)
rsf := terrajen.ResourceFile(resourceSchema)
resourceBuf := bytes.Buffer{}
if err := rsf.Render(&resourceBuf); err != nil {
terrajen.JenDebug(err)
return nil, fmt.Errorf("rendering resource file: %w", err)
}
ar.Files = append(ar.Files, txtar.File{
Name: resourceSchema.FilePath,
Data: resourceBuf.Bytes(),
})
rsSubPkgFile, ok := terrajen.SubPkgFile(resourceSchema)
if !ok {
continue
}
rsSubPkgBuf := bytes.Buffer{}
if err := rsSubPkgFile.Render(&rsSubPkgBuf); err != nil {
terrajen.JenDebug(err)
return nil, fmt.Errorf("rendering sub package file: %w", err)
}
ar.Files = append(ar.Files, txtar.File{
Name: resourceSchema.SubPkgPath,
Data: rsSubPkgBuf.Bytes(),
})
}
//
// Generate Data blocks
//
for name, data := range schema.DataSourceSchemas {
dataSchema := provider.SchemaData(name, data.Block)
df := terrajen.DataSourceFile(dataSchema)
dataBuf := bytes.Buffer{}
if err := df.Render(&dataBuf); err != nil {
terrajen.JenDebug(err)
return nil, fmt.Errorf("rendering data file: %w", err)
}
ar.Files = append(ar.Files, txtar.File{
Name: dataSchema.FilePath,
Data: dataBuf.Bytes(),
})
dataSubPkgFile, ok := terrajen.SubPkgFile(dataSchema)
if !ok {
continue
}
dataSubPkgBuf := bytes.Buffer{}
if err := dataSubPkgFile.Render(&dataSubPkgBuf); err != nil {
terrajen.JenDebug(err)
return nil, fmt.Errorf("rendering sub package file: %w", err)
}
ar.Files = append(ar.Files, txtar.File{
Name: dataSchema.SubPkgPath,
Data: dataSubPkgBuf.Bytes(),
})
}
return &ar, nil
}
func createDirIfNotEmpty(path string, force, clean bool) error {
f, err := os.Open(path)
if err != nil {
if !os.IsNotExist(err) {
return err
}
// Create the directory
if err := os.MkdirAll(
path,
os.ModePerm,
); err != nil {
return err
}
return nil
}
_, readErr := f.Readdirnames(1)
if readErr != nil {
if readErr == io.EOF {
return nil
}
return err
}
// The directory is not empty. If force or clean flags are not provided, we
// have a problem.
if !force && !clean {
return ErrPackageLocationNotEmpty
}
if !clean {
return nil
}
if err := os.RemoveAll(path); err != nil {
return fmt.Errorf("cleaning directory: %w", err)
}
// Create the directory again now that it's gone
return createDirIfNotEmpty(path, false, false)
}
// ParseProvider takes a provider as a string and returns a Provider object.
// An error is returned if the string could not be parsed.
// Example provider: aws=hashicorp/aws:4.60.0
func ParseProvider(s string) (Provider, error) {
pMap := strings.SplitN(s, "=", 2)
if len(pMap) == 1 {
return Provider{}, fmt.Errorf("provider format incorrect: missing `=`")
}
p := Provider{
Name: pMap[0],
}
sourceVersion := strings.SplitN(pMap[1], ":", 2)
if len(sourceVersion) == 1 {
return Provider{}, fmt.Errorf(
"provider format incorrect: missing `:` in `source:version`",
)
}
p.Source = sourceVersion[0]
p.Version = sourceVersion[1]
// Add the provider to the map
return p, nil
}