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tables.go
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tables.go
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package sdata
import (
"database/sql"
"fmt"
"regexp"
"strings"
"github.com/mitchellh/hashstructure/v2"
"golang.org/x/sync/errgroup"
)
type DBInfo struct {
Type string
Version int
Schema string
Name string
Tables []DBTable `hash:"set"`
Functions []DBFunction `hash:"set"`
VTables []VirtualTable `hash:"set"`
colMap map[string]int `hash:"-"`
tableMap map[string]int `hash:"-"`
hash uint64 `hash:"-"`
}
type DBTable struct {
Schema string
Name string
Type string
Columns []DBColumn `hash:"set"`
PrimaryCol DBColumn
SecondaryCol DBColumn
FullText []DBColumn `hash:"set"`
Blocked bool
colMap map[string]int `hash:"-"`
}
type VirtualTable struct {
Name string
IDColumn string
TypeColumn string
FKeyColumn string
}
type st struct {
schema, table string
}
func GetDBInfo(
db *sql.DB,
dbType string,
blockList []string) (*DBInfo, error) {
var dbVersion int
var dbSchema, dbName string
var cols []DBColumn
var funcs []DBFunction
var err error
g := errgroup.Group{}
g.Go(func() error {
var row *sql.Row
switch dbType {
case "mysql":
row = db.QueryRow(mysqlInfo)
default:
row = db.QueryRow(postgresInfo)
}
if err := row.Scan(&dbVersion, &dbSchema, &dbName); err != nil {
return err
}
return nil
})
g.Go(func() error {
var err error
if cols, err = DiscoverColumns(db, dbType, blockList); err != nil {
return err
}
if funcs, err = DiscoverFunctions(db, blockList); err != nil {
return err
}
return nil
})
if err := g.Wait(); err != nil {
return nil, err
}
di := NewDBInfo(
dbType,
dbVersion,
dbSchema,
dbName,
cols,
funcs,
blockList)
di.hash, err = hashstructure.Hash(di, hashstructure.FormatV2, nil)
if err != nil {
return nil, err
}
return di, nil
}
func NewDBInfo(
dbType string,
dbVersion int,
dbSchema string,
dbName string,
cols []DBColumn,
funcs []DBFunction,
blockList []string) *DBInfo {
di := &DBInfo{
Type: dbType,
Version: dbVersion,
Schema: dbSchema,
Name: dbName,
Functions: funcs,
colMap: make(map[string]int),
tableMap: make(map[string]int),
}
tm := make(map[st][]DBColumn)
for i := range cols {
c := cols[i]
di.colMap[(c.Schema + ":" + c.Table + ":" + c.Name)] = i
k1 := st{c.Schema, c.Table}
tm[k1] = append(tm[k1], c)
}
for k, tcols := range tm {
ti := NewDBTable(k.schema, k.table, "", tcols)
if strings.HasPrefix(ti.Name, "_gj_") {
continue
}
ti.Blocked = isInList(ti.Name, blockList)
di.AddTable(ti)
}
return di
}
func NewDBTable(schema, name, _type string, cols []DBColumn) DBTable {
ti := DBTable{
Schema: schema,
Name: name,
Type: _type,
Columns: cols,
colMap: make(map[string]int, len(cols)),
}
for i, c := range cols {
switch {
case c.FullText:
ti.FullText = append(ti.FullText, c)
case c.PrimaryKey:
ti.PrimaryCol = c
}
ti.colMap[strings.ToLower(c.Name)] = i
}
return ti
}
func (di *DBInfo) AddTable(t DBTable) {
for i, c := range t.Columns {
di.colMap[(c.Schema + ":" + c.Table + ":" + c.Name)] = i
}
i := len(di.Tables)
di.Tables = append(di.Tables, t)
di.tableMap[(t.Schema + ":" + t.Name)] = i
}
func (di *DBInfo) GetColumn(schema, table, column string) (*DBColumn, error) {
t, err := di.GetTable(schema, table)
if err != nil {
return nil, err
}
cid, ok := t.colMap[column]
if !ok {
return nil, fmt.Errorf("column: '%s.%s.%s' not found", schema, table, column)
}
return &t.Columns[cid], nil
}
func (di *DBInfo) GetTable(schema, table string) (*DBTable, error) {
tid, ok := di.tableMap[(schema + ":" + table)]
if !ok {
return nil, fmt.Errorf("table: '%s.%s' not found", schema, table)
}
return &di.Tables[tid], nil
}
type DBColumn struct {
ID int32
Name string
Type string
Array bool
NotNull bool
PrimaryKey bool
UniqueKey bool
FullText bool
FKeySchema string
FKeyTable string
FKeyCol string
Blocked bool
Table string
Schema string
}
func DiscoverColumns(db *sql.DB, dbtype string, blockList []string) ([]DBColumn, error) {
var sqlStmt string
switch dbtype {
case "mysql":
sqlStmt = mysqlColumnsStmt
default:
sqlStmt = postgresColumnsStmt
}
rows, err := db.Query(sqlStmt)
if err != nil {
return nil, fmt.Errorf("error fetching columns: %s", err)
}
defer rows.Close()
cmap := make(map[string]DBColumn)
for rows.Next() {
var c DBColumn
err = rows.Scan(&c.Schema, &c.Table, &c.Name, &c.Type, &c.NotNull, &c.PrimaryKey, &c.UniqueKey, &c.Array, &c.FullText, &c.FKeySchema, &c.FKeyTable, &c.FKeyCol)
if err != nil {
return nil, err
}
k := (c.Schema + ":" + c.Table + ":" + c.Name)
v, ok := cmap[k]
if !ok {
v = c
v.ID = int32(len(cmap))
if strings.HasPrefix(v.Table, "_gj_") {
continue
}
v.Blocked = isInList(v.Name, blockList)
}
if c.Type != "" {
v.Type = c.Type
}
if c.PrimaryKey {
v.PrimaryKey = true
v.UniqueKey = true
}
if c.NotNull {
v.NotNull = true
}
if c.UniqueKey {
v.UniqueKey = true
}
if c.Array {
v.Array = true
}
if c.FullText {
v.FullText = true
}
if c.FKeySchema != "" {
v.FKeySchema = c.FKeySchema
}
if c.FKeyTable != "" {
v.FKeyTable = c.FKeyTable
}
if c.FKeyCol != "" {
v.FKeyCol = c.FKeyCol
}
cmap[k] = v
}
var cols []DBColumn
for _, c := range cmap {
cols = append(cols, c)
}
return cols, nil
}
type DBFunction struct {
Name string
Params []DBFuncParam
}
type DBFuncParam struct {
ID int
Name sql.NullString
Type string
}
func DiscoverFunctions(db *sql.DB, blockList []string) ([]DBFunction, error) {
rows, err := db.Query(functionsStmt)
if err != nil {
return nil, fmt.Errorf("Error fetching functions: %s", err)
}
defer rows.Close()
var funcs []DBFunction
fm := make(map[string]int)
parameterIndex := 1
for rows.Next() {
var fn, fid string
fp := DBFuncParam{}
err = rows.Scan(&fn, &fid, &fp.Type, &fp.Name, &fp.ID)
if err != nil {
return nil, err
}
if !fp.Name.Valid {
fp.Name.String = fmt.Sprintf("%d", parameterIndex)
fp.Name.Valid = true
}
if i, ok := fm[fid]; ok {
funcs[i].Params = append(funcs[i].Params, fp)
} else {
if isInList(fn, blockList) {
continue
}
funcs = append(funcs, DBFunction{Name: fn, Params: []DBFuncParam{fp}})
fm[fid] = len(funcs) - 1
}
parameterIndex++
}
return funcs, nil
}
func (di *DBInfo) Hash() uint64 {
return di.hash
}
func isInList(val string, s []string) bool {
for _, v := range s {
regex := fmt.Sprintf("^%s$", v)
if matched, _ := regexp.MatchString(regex, val); matched {
return true
}
}
return false
}