json_utility.go
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package restutility
import (
"net/http"
"encoding/json"
"errors"
"gopkg.in/rana/ora.v3"
"io"
"io/ioutil"
"sync"
)
var mu = &sync.Mutex{}
var allPayloads []payloadBuff
type LangMap map[string]map[string]string
type Field struct {
Parameter string `json:"param"`
Type string `json:"type"`
Visible bool `json:"visible"`
Editable bool `json:"editable"`
}
type CorrelationField struct {
Result string `json:"result"`
Elements []string `json:"elements"`
Type string `json:"type"`
}
type Translation struct {
Language string `json:"language"`
FieldsLabels map[string]string `json:"fieldsLabels"`
}
// Field 'Type' is not required in payload.
// 'payloadBuff' type is only a bridge between ORACLE CLOB and 'Payload' type.
type payloadBuff struct {
Type string `json:"tableType"`
Method string `json:"method"`
Params map[string]string `json:"params"`
Lang []Translation `json:"lang"`
Fields []Field `json:"fields"`
Correlations []CorrelationField `json:"correlationFields"`
IdField string `json:"idField"`
// Data can only hold slices of any type. It can't be used for itteration
Data interface{} `json:"data"`
}
type Payload struct {
Method string `json:"method"`
Params map[string]string `json:"params"`
Lang []Translation `json:"lang"`
Fields []Field `json:"fields"`
Correlations []CorrelationField `json:"correlationFields"`
IdField string `json:"idField"`
// Data can only hold slices of any type. It can't be used for itteration
Data interface{} `json:"data"`
}
func NewPayload(r *http.Request, table string) Payload {
var pload Payload
pload.Method = r.Method + " " + r.URL.Path
if table != "" {
pload.Params = make(map[string]string, 0)
pload.Lang = loadTranslations(table)
pload.Fields = loadFields(table)
pload.IdField = loadIdField(table)
pload.Correlations = loadCorrelations(table)
}
return pload
}
func DeliverPayload(w http.ResponseWriter, payload Payload) {
json.NewEncoder(w).Encode(payload)
payload.Data = nil
}
func loadTranslations(id string) []Translation {
translations := make([]Translation, 0)
for _, pload := range allPayloads {
if pload.Type == id {
for _, t := range pload.Lang {
//translations[t.Language] = t.FieldsLabels
translations = append(translations, Translation{
Language: t.Language,
FieldsLabels: t.FieldsLabels,
})
}
}
}
return translations
}
func loadFields(id string) []Field {
fields := make([]Field, 0)
for _, pload := range allPayloads {
if pload.Type == id{
for _, f := range pload.Fields {
fields = append(fields, f)
}
}
}
return fields
}
func loadIdField(id string) string {
for _, pload := range allPayloads {
if pload.Type == id {
return pload.IdField
}
}
return ""
}
func loadCorrelations(id string) []CorrelationField {
resp := make([]CorrelationField, 0)
for _, pload := range allPayloads {
if pload.Type == id {
for _, f := range pload.Correlations {
resp = append(resp, f)
}
}
}
return resp
}
func InitTables(db *ora.Ses, project string) error {
jsonbuf, _ := fetchJSON(db, EqualQuotes(project))
mu.Lock()
defer mu.Unlock()
json.Unmarshal(jsonbuf, &allPayloads)
if len(allPayloads) == 0 {
return errors.New("tables config is corrupt")
}
return nil
}
func fetchJSON(db *ora.Ses, project string) ([]byte, error) {
stmt, err := db.Prep(`SELECT
JSON_CLOB
FROM TABLES_CONFIG
WHERE PROJEKAT` + project, ora.S)
defer stmt.Close()
if err != nil {
return nil, err
}
rset, err := stmt.Qry()
if err != nil {
return nil, err
}
bytes := make([]byte, 0)
if rset.Next() {
lob := rset.Row[0].(io.Reader)
bytes, err = ioutil.ReadAll(lob)
if err != nil {
// Ignore for now, it's some weird streaming read/write LOB error.
// TODO: Find a fix for this.
//return nil, err
}
}
return bytes, nil
}