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hcl_utils.go
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hcl_utils.go
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package utils
import (
"os"
"strings"
"github.com/hashicorp/hcl/hcl/ast"
"github.com/hashicorp/hcl/hcl/printer"
jsonParser "github.com/hashicorp/hcl/json/parser"
"github.com/hashicorp/hcl/v2/hclwrite"
"github.com/zclconf/go-cty/cty"
"github.com/cloudposse/atmos/pkg/convert"
"github.com/cloudposse/atmos/pkg/schema"
)
// PrintAsHcl prints the provided value as HCL (HashiCorp Language) document to the console
func PrintAsHcl(data any) error {
astree, err := ConvertToHclAst(data)
if err != nil {
return err
}
err = printer.Fprint(os.Stdout, astree)
if err != nil {
return err
}
return nil
}
// WriteToFileAsHcl converts the provided value to HCL (HashiCorp Language) and writes it to the specified file
func WriteToFileAsHcl(
cliConfig schema.CliConfiguration,
filePath string,
data any,
fileMode os.FileMode,
) error {
astree, err := ConvertToHclAst(data)
if err != nil {
return err
}
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE, fileMode)
if err != nil {
return err
}
defer func(f *os.File) {
err := f.Close()
if err != nil {
LogWarning(cliConfig, err.Error())
}
}(f)
err = printer.Fprint(f, astree)
if err != nil {
return err
}
return nil
}
// ConvertToHclAst converts the provided value to an HCL abstract syntax tree
func ConvertToHclAst(data any) (ast.Node, error) {
j, err := ConvertToJSONFast(data)
if err != nil {
return nil, err
}
astree, err := jsonParser.Parse([]byte(j))
if err != nil {
return nil, err
}
// Remove the double quotes around the terraform variable names (the double quotes come from JSON keys)
// since they will be written to the terraform varfiles and terraform does not like it
if objectList, ok := astree.Node.(*ast.ObjectList); ok {
for _, item := range objectList.Items {
for i, key := range item.Keys {
item.Keys[i].Token.Text = strings.Replace(key.Token.Text, "\"", "", -1)
}
}
}
return astree.Node, nil
}
// WriteTerraformBackendConfigToFileAsHcl writes the provided Terraform backend config to the specified file
// https://dev.to/pdcommunity/write-terraform-files-in-go-with-hclwrite-2e1j
// https://pkg.go.dev/github.com/hashicorp/hcl/v2/hclwrite
func WriteTerraformBackendConfigToFileAsHcl(
cliConfig schema.CliConfiguration,
filePath string,
backendType string,
backendConfig map[any]any,
) error {
hclFile := hclwrite.NewEmptyFile()
rootBody := hclFile.Body()
tfBlock := rootBody.AppendNewBlock("terraform", nil)
tfBlockBody := tfBlock.Body()
backendBlock := tfBlockBody.AppendNewBlock("backend", []string{backendType})
backendBlockBody := backendBlock.Body()
backendConfigSortedKeys := StringKeysFromMap(convert.MapsOfInterfacesToMapsOfStrings(backendConfig))
for _, name := range backendConfigSortedKeys {
v := backendConfig[name]
if v == nil {
backendBlockBody.SetAttributeValue(name, cty.NilVal)
} else if i, ok := v.(string); ok {
backendBlockBody.SetAttributeValue(name, cty.StringVal(i))
} else if i, ok := v.(bool); ok {
backendBlockBody.SetAttributeValue(name, cty.BoolVal(i))
} else if i, ok := v.(int64); ok {
backendBlockBody.SetAttributeValue(name, cty.NumberIntVal(i))
} else if i, ok := v.(uint64); ok {
backendBlockBody.SetAttributeValue(name, cty.NumberUIntVal(i))
} else if i, ok := v.(float64); ok {
backendBlockBody.SetAttributeValue(name, cty.NumberFloatVal(i))
}
}
f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
defer func(f *os.File) {
err := f.Close()
if err != nil {
LogWarning(cliConfig, err.Error())
}
}(f)
_, err = f.Write(hclFile.Bytes())
if err != nil {
return err
}
return nil
}