github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/controllerutil/cue_value.go (about)

     1  /*
     2  Copyright (C) 2022-2023 ApeCloud Co., Ltd
     3  
     4  This file is part of KubeBlocks project
     5  
     6  This program is free software: you can redistribute it and/or modify
     7  it under the terms of the GNU Affero General Public License as published by
     8  the Free Software Foundation, either version 3 of the License, or
     9  (at your option) any later version.
    10  
    11  This program is distributed in the hope that it will be useful
    12  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  GNU Affero General Public License for more details.
    15  
    16  You should have received a copy of the GNU Affero General Public License
    17  along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18  */
    19  
    20  package controllerutil
    21  
    22  import (
    23  	"encoding/json"
    24  	"os"
    25  
    26  	"cuelang.org/go/cue"
    27  	"cuelang.org/go/cue/cuecontext"
    28  	cuejson "cuelang.org/go/encoding/json"
    29  )
    30  
    31  func NewCUETplFromPath(filePathString string) (*CUETpl, error) {
    32  	return NewCUETplFromBytes(os.ReadFile(filePathString))
    33  }
    34  
    35  func NewCUETplFromBytes(b []byte, err error) (*CUETpl, error) {
    36  	if err != nil {
    37  		return nil, err
    38  	}
    39  	return NewCUETpl(b), nil
    40  }
    41  
    42  func NewCUETpl(templateContents []byte) *CUETpl {
    43  	cueValue := CUETpl{
    44  		Ctx: cuecontext.New(),
    45  	}
    46  	temValue := cueValue.Ctx.CompileBytes(templateContents)
    47  	cueValue.Value = temValue
    48  	return &cueValue
    49  }
    50  
    51  type CUETpl struct {
    52  	Ctx   *cue.Context
    53  	Value cue.Value
    54  }
    55  
    56  type CUEBuilder struct {
    57  	cueTplValue CUETpl
    58  	Value       cue.Value
    59  }
    60  
    61  func NewCUEBuilder(cueTpl CUETpl) CUEBuilder {
    62  	return CUEBuilder{
    63  		cueTplValue: cueTpl,
    64  		Value:       cueTpl.Value,
    65  	}
    66  }
    67  
    68  func (v *CUEBuilder) FillObj(path string, obj any) error {
    69  	b, err := json.Marshal(obj)
    70  	if err != nil {
    71  		return err
    72  	}
    73  	return v.Fill(path, b)
    74  }
    75  
    76  func (v *CUEBuilder) Fill(path string, jsonByte []byte) error {
    77  	expr, err := cuejson.Extract("", jsonByte)
    78  	if err != nil {
    79  		return err
    80  	}
    81  	cueValue := v.cueTplValue.Ctx.BuildExpr(expr)
    82  	v.Value = v.Value.FillPath(cue.ParsePath(path), cueValue)
    83  	return nil
    84  }
    85  
    86  func (v *CUEBuilder) Lookup(path string) ([]byte, error) {
    87  	cueValue := v.Value.LookupPath(cue.ParsePath(path))
    88  	return cueValue.MarshalJSON()
    89  }
    90  
    91  // func (v *CueValue) Render() (string, error) {
    92  // 	b, err := v.Value.MarshalJSON()
    93  // 	str := string(b)
    94  // 	return str, err
    95  // }