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param_loader.go
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/
param_loader.go
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// Copyright (c) ClaceIO, LLC
// SPDX-License-Identifier: Apache-2.0
package apptype
import (
"fmt"
"regexp"
"github.com/claceio/clace/internal/app/starlark_type"
"go.starlark.net/starlark"
"go.starlark.net/starlarkstruct"
)
const (
PARAM = "param"
)
// AppParam represents a parameter in an app.
type AppParam struct {
Name string
Description string
Required bool
Type starlark_type.TypeName
DefaultValue starlark.Value
}
func ReadParamInfo(fileName string, inp []byte) (map[string]AppParam, error) {
paramInfo, err := LoadParamInfo(fileName, inp)
if err != nil {
return nil, err
}
if err := validateParamInfo(paramInfo); err != nil {
return nil, err
}
return paramInfo, nil
}
var spaceRegex = regexp.MustCompile(`\s`)
func validateParamInfo(paramInfo map[string]AppParam) error {
for _, p := range paramInfo {
if p.Name == "" {
return fmt.Errorf("param name is required")
}
if spaceRegex.MatchString(p.Name) {
return fmt.Errorf("param name \"%s\" has spaces", p.Name)
}
if p.DefaultValue == starlark.None {
continue
}
switch p.Type {
case starlark_type.INT:
if _, ok := p.DefaultValue.(starlark.Int); !ok {
return fmt.Errorf("param %s is of type int but default value is not an int", p.Name)
}
case starlark_type.STRING:
if _, ok := p.DefaultValue.(starlark.String); !ok {
return fmt.Errorf("param %s is of type string but default value is not a string", p.Name)
}
case starlark_type.BOOLEAN:
if _, ok := p.DefaultValue.(starlark.Bool); !ok {
return fmt.Errorf("param %s is of type bool but default value is not a bool", p.Name)
}
case starlark_type.DICT:
if _, ok := p.DefaultValue.(*starlark.Dict); !ok {
return fmt.Errorf("param %s is of type dict but default value is not a dict", p.Name)
}
case starlark_type.LIST:
if _, ok := p.DefaultValue.(*starlark.List); !ok {
return fmt.Errorf("param %s is of type list but default value is not a list", p.Name)
}
default:
return fmt.Errorf("unknown type %s for %s", p.Type, p.Name)
}
}
return nil
}
func LoadParamInfo(fileName string, data []byte) (map[string]AppParam, error) {
definedParams := make(map[string]AppParam)
paramBuiltin := func(_ *starlark.Thread, _ *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var name, description, dataType starlark.String
var defaultValue starlark.Value = starlark.None
var required starlark.Bool = starlark.Bool(true)
if err := starlark.UnpackArgs(PARAM, args, kwargs, "name", &name, "type?", &dataType, "default?", &defaultValue,
"description?", &description, "required?", &required); err != nil {
return nil, err
}
if _, ok := definedParams[string(name)]; ok {
return nil, fmt.Errorf("param %s already defined", name)
}
typeVal := starlark_type.TypeName(dataType)
if typeVal == "" {
typeVal = starlark_type.STRING
}
if typeVal != starlark_type.INT && typeVal != starlark_type.STRING &&
typeVal != starlark_type.BOOLEAN && typeVal != starlark_type.DICT && typeVal != starlark_type.LIST {
return nil, fmt.Errorf("unknown type %s for %s", typeVal, name)
}
if required == starlark.False && defaultValue == starlark.None {
switch typeVal {
case starlark_type.INT:
defaultValue = starlark.MakeInt(0)
case starlark_type.STRING:
defaultValue = starlark.String("")
case starlark_type.BOOLEAN:
defaultValue = starlark.Bool(false)
case starlark_type.DICT:
defaultValue = starlark.NewDict(0)
case starlark_type.LIST:
defaultValue = starlark.NewList(nil)
}
}
definedParams[string(name)] = AppParam{
Name: string(name),
Type: typeVal,
DefaultValue: defaultValue,
Description: string(description),
Required: bool(required),
}
paramDict := starlark.StringDict{
"name": name,
"type": dataType,
"default": defaultValue,
"description": description,
"required": required,
}
return starlarkstruct.FromStringDict(starlark.String(PARAM), paramDict), nil
}
builtins := starlark.StringDict{
PARAM: starlark.NewBuiltin(PARAM, paramBuiltin),
string(starlark_type.INT): starlark.String(starlark_type.INT),
string(starlark_type.STRING): starlark.String(starlark_type.STRING),
string(starlark_type.BOOLEAN): starlark.String(starlark_type.BOOLEAN),
string(starlark_type.DICT): starlark.String(starlark_type.DICT),
string(starlark_type.LIST): starlark.String(starlark_type.LIST),
}
thread := &starlark.Thread{
Name: fileName,
Print: func(_ *starlark.Thread, msg string) { fmt.Println(msg) },
}
_, err := starlark.ExecFile(thread, fileName, data, builtins)
if err != nil {
if evalErr, ok := err.(*starlark.EvalError); ok {
fmt.Printf("Error loading app params: %s\n", evalErr.Backtrace()) // TODO: log
}
return nil, fmt.Errorf("error loading params: %w", err)
}
return definedParams, nil
}