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builder.go
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/
builder.go
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package querybuilder
import (
"fmt"
"io/ioutil"
"os"
"strings"
yaml "gopkg.in/yaml.v3"
)
const (
INVALID_FILE_TYPE = "invalid file type"
)
type QueryError struct {
QueryFile string
Message string
}
func (e *QueryError) Error() string {
return " Reason: " + e.Message + " , Target: " + e.QueryFile
}
type QueryBuilder struct {
ScriptPath string
Query BindEntry
}
var queryBuilder *QueryBuilder
func QueryBuilderInitialize(scriptPath string) error {
queryBuilder = &QueryBuilder{
ScriptPath: scriptPath,
}
return queryBuilder.Load()
}
func GetQueryBuilder() *QueryBuilder {
return queryBuilder
}
func (qb *QueryBuilder) Load() error {
qb.Query = BindEntry{}
if fileInfo, err := os.Stat(qb.ScriptPath); err != nil {
return err
} else {
if fileInfo.IsDir() {
return qb.loadFiles()
} else {
return qb.loadFile()
}
}
}
func (qb *QueryBuilder) loadFileData(scriptFilePath string) *QueryError {
if fBody, err := ioutil.ReadFile(scriptFilePath); err != nil {
return &QueryError{
QueryFile: scriptFilePath,
Message: err.Error(),
}
} else {
holder := BindEntry{}
if marshalErr := yaml.Unmarshal(fBody, holder); marshalErr != nil {
return &QueryError{
QueryFile: scriptFilePath,
Message: marshalErr.Error(),
}
} else {
for key, entry := range holder {
qb.Query[key] = entry
}
}
}
return nil
}
func validFileType(filename string) bool {
isValid := strings.HasSuffix(filename, ".yml") || strings.HasSuffix(filename, ".yaml")
return isValid
}
func (qb *QueryBuilder) loadFile() error {
if !validFileType(qb.ScriptPath) {
return &QueryError{
QueryFile: qb.ScriptPath,
Message: INVALID_FILE_TYPE,
}
}
if err := qb.loadFileData(qb.ScriptPath); err != nil {
return err
}
return nil
}
func (qb *QueryBuilder) loadFiles() error {
if files, err := ioutil.ReadDir(qb.ScriptPath); err != nil {
return err
} else {
for _, fileInfo := range files {
if fileInfo.IsDir() {
continue
}
fileName := fileInfo.Name()
if validFileType(qb.ScriptPath) {
continue
}
scriptFilePath := fmt.Sprintf("%s/%s", qb.ScriptPath, fileName)
if err := qb.loadFileData(scriptFilePath); err != nil {
return err
}
}
return nil
}
}
func (qb *QueryBuilder) GetStatement(name string) *Statement {
if item, exists := qb.Query[name]; exists {
return &Statement{
Name: name,
Type: item.Type,
Description: item.Description,
Script: item.Script,
Columns: item.Columns,
}
}
return nil
}