/
db.go
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/
db.go
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// Copyright 2023 Tamás Gulácsi. All rights reserved.
//
// SPDX-License-Identifier: UPL-1.0 OR Apache-2.0
package x
import (
"context"
"database/sql"
"fmt"
"strconv"
"strings"
"sync"
"time"
"golang.org/x/exp/slog"
)
var _ = slog.Info
func (f Function) FullName() string {
nm := strings.ToLower(f.Name)
if f.Alias != "" {
nm = strings.ToLower(f.Name)
}
if f.Package == "" {
return nm
}
return UnoCap(f.Package) + "." + nm
}
func (f Function) RealName() string {
if f.Replacement != nil {
return f.Replacement.RealName()
}
nm := strings.ToLower(f.Name)
if f.Package == "" {
return nm
}
return UnoCap(f.Package) + "." + nm
}
func (f Function) AliasedName() string {
if f.Alias != "" {
return f.Alias
}
return f.Name
}
func (f Function) String() string {
args := make([]string, len(f.Args))
for i := range args {
args[i] = f.Args[i].String()
}
s := f.FullName() + "(" + strings.Join(args, ", ") + ")"
if f.Documentation == "" {
return s
}
return s + "\n" + f.Documentation
}
func (f Function) HasCursorOut() bool {
if f.Returns != nil && f.Returns.Type.DataType == "REF CURSOR" {
return true
}
for _, arg := range f.Args {
if arg.IsOutput() && arg.Type.DataType == "REF CURSOR" {
return true
}
}
return false
}
type direction uint8
func (dir direction) IsInput() bool { return dir&DirIn > 0 }
func (dir direction) IsOutput() bool { return dir&DirOut > 0 }
func (dir direction) String() string {
switch dir {
case DirIn:
return "IN"
case DirOut:
return "OUT"
case DirInOut:
return "INOUT"
}
return fmt.Sprintf("%d", dir)
}
func (dir direction) MarshalText() ([]byte, error) {
return []byte(dir.String()), nil
}
func (dir *direction) UnmarshalText(p []byte) error {
switch string(p) {
case "IN":
*dir = DirIn
case "OUT":
*dir = DirOut
case "INOUT":
*dir = DirInOut
default:
return fmt.Errorf("unknown dir %q", string(p))
}
return nil
}
const (
DirIn = direction(1)
DirOut = direction(2)
DirInOut = direction(3)
)
const (
MarkNull = "\u2400" // 0x2400 = nul
//MarkValid = "\u6eff" // 0x6eff = fill; full, satisfied
MarkValid = "Valid" // 0x6eff = fill; full, satisfied
//MarkHidden = "\u533f" // 0x533f = hide
MarkHidden = "_hidden"
DefaultMaxVARCHARLength = 32767
DefaultMaxCHARLength = 10
)
type Attribute struct {
Name string
AbsType string `json:",omitempty"`
goTypeName string
Type ObjectOrScalar
}
func (a Attribute) IsScalar() bool { return a.Type.IsScalar() }
func (a ObjectOrScalar) IsScalar() bool { return !a.IsObject && !a.IsCollection }
type Argument struct {
Attribute
Direction direction
}
func (a Argument) String() string {
return fmt.Sprintf("%s %s %s", a.Name, a.Direction, a.Attribute.Type.Triplet)
}
func (a Argument) IsInput() bool {
return a.Direction&DirIn != 0
}
func (a Argument) IsOutput() bool {
return a.Direction&DirOut != 0
}
type Function struct {
Triplet
Alias string `json:",omitempty"`
Args []Argument `json:",omitempty"`
Returns *Attribute `json:",omitempty"`
Replacement *Function `json:",omitempty"`
ReplacementIsJSON bool `json:",omitempty"`
LastDDL time.Time `json:",omitempty"`
handle []string
Documentation string `json:",omitempty"`
maxTableSize int
}
type Scalar struct {
DataType string
Length, Precision, Scale sql.NullInt32
}
func (s Scalar) MarshalJSON() ([]byte, error) {
buf := Buffers.Get()
defer Buffers.Put(buf)
buf.WriteString(`{"DataType":`)
var b []byte
for _, ni := range []struct {
nm string
*sql.NullInt32
}{
{"Length", &s.Length}, {"Precision", &s.Precision}, {"Scale", &s.Scale},
} {
if ni.Valid {
buf.WriteString(`,"` + ni.nm + `":`)
b = strconv.AppendInt(b[:0], int64(ni.Int32), 10)
buf.Write(b)
}
}
buf.WriteString(`}`)
return buf.Bytes(), nil
}
type Object struct {
CollectionOf *ObjectOrScalar
Triplet
TypeLink string
TypeObjectType, PlsType string
IndexBy string
Attributes []Attribute
IsCollection bool
}
type ObjectOrScalar struct {
Object
Scalar
IsObject bool
}
type Triplet struct {
Owner, Package, Name string
}
type DB struct {
DB querier
objCache map[Triplet]*Object
mu sync.Mutex
}
func (db *DB) ReadPackage(ctx context.Context, pkg string) ([]Function, error) {
owner, pkg := splitOwner(pkg)
const qry = `SELECT
owner, package_name, object_name, argument_name, data_type,
in_out, data_length, data_precision, data_scale,
type_owner, type_name, type_subname, type_link,
type_object_type, pls_type
FROM all_arguments
WHERE owner = NVL(:1, SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')) AND
package_name = UPPER(:2)
ORDER BY object_id, subprogram_id, sequence`
rows, err := db.DB.QueryContext(ctx, qry, owner, pkg)
if err != nil {
return nil, fmt.Errorf("%s [%q, %q]: %w", qry, owner, pkg, err)
}
defer rows.Close()
var funcs []Function
var old Function
for rows.Next() {
var act Function
var arg Argument
var inOut string
if err = rows.Scan(
&act.Owner, &act.Package, &act.Name,
&arg.Name, &arg.Type.DataType, &inOut,
&arg.Type.Length, &arg.Type.Precision, &arg.Type.Scale,
&arg.Type.Owner, &arg.Type.Package, &arg.Type.Name, &arg.Type.TypeLink,
&arg.Type.TypeObjectType, &arg.Type.PlsType,
); err != nil {
return funcs, fmt.Errorf("%s [%q, %q]: %w", qry, owner, pkg, err)
}
if arg.Type.IsObject = arg.Type.Owner != ""; arg.Type.IsObject {
sub, err := db.ReadObject(ctx, arg.Type.Object.Triplet)
if err != nil {
return funcs, err
}
arg.Type.Object = *sub
}
switch inOut {
case "IN":
arg.Direction = DirIn
case "OUT":
arg.Direction = DirOut
default:
arg.Direction = DirInOut
}
switch arg.Type.Name {
case "CHAR", "NCHAR", "VARCHAR", "NVARCHAR", "VARCHAR2", "NVARCHAR2":
if arg.Type.Length.Int32 == 0 {
if strings.Contains(arg.Type.Name, "VAR") {
arg.Type.Length = sql.NullInt32{Valid: true, Int32: DefaultMaxVARCHARLength}
} else {
arg.Type.Length.Int32 = DefaultMaxCHARLength
}
}
arg.AbsType = fmt.Sprintf("%s(%d)", arg.Type.Name, arg.Type.Length.Int32)
case "NUMBER":
if arg.Type.Scale.Int32 > 0 {
arg.AbsType = fmt.Sprintf("NUMBER(%d, %d)", arg.Type.Precision.Int32, arg.Type.Scale.Int32)
} else if arg.Type.Precision.Int32 > 0 {
arg.AbsType = fmt.Sprintf("NUMBER(%d)", arg.Type.Precision.Int32)
} else {
arg.AbsType = "NUMBER"
}
case "PL/SQL PLS INTEGER", "PLS_INTEGER", "BINARY_INTEGER":
arg.AbsType = "INTEGER(10)"
}
//slog.Debug("fun arg", "arg", arg)
if old.Owner == act.Owner && old.Package == act.Package && old.Name == act.Name {
old.Args = append(old.Args, arg)
} else {
act.Args = append(act.Args, arg)
if old.Name != "" {
funcs = append(funcs, old)
}
old = act
}
}
rows.Close()
if old.Name != "" {
funcs = append(funcs, old)
}
for i, f := range funcs {
if len(f.Args) != 0 && f.Args[0].Name == "" {
f.Returns = &f.Args[0].Attribute
f.Args = f.Args[1:]
funcs[i] = f
//slog.Debug("moved return to Return", "args", len(f.Args), "fun", f.Name, "args[0].Name", f.Args[0].Name)
}
}
return funcs, rows.Err()
}
func (db *DB) ReadObject(ctx context.Context, name Triplet) (*Object, error) {
//slog.Debug("ReadObject", "obj", name)
db.mu.Lock()
obj := db.objCache[name]
db.mu.Unlock()
if obj != nil {
return obj, nil
}
obj = &Object{Triplet: name}
const qry = `SELECT typecode, attributes
FROM all_plsql_types
WHERE owner = NVL(:1, SYS_CONTEXT('BR_CTX_G','CURRENT_SCHEMA')) AND package_name = :2 AND type_name = :3`
var typ string
var n int32
if err := db.DB.QueryRowContext(ctx, qry, obj.Owner, obj.Package, obj.Name).Scan(
&typ, &n,
); err != nil {
return nil, fmt.Errorf("%s [%q, %q, %q]: %w", qry, obj.Owner, obj.Package, obj.Name, err)
}
//slog.Debug("IsCollection", "typ", typ, "n", n)
if n != 0 {
obj.Attributes = make([]Attribute, 0, int(n))
const qry = `SELECT attr_name,
attr_type_owner, attr_type_package, attr_type_name,
length, precision, scale
FROM all_plsql_type_attrs
WHERE owner = NVL(:1, SYS_CONTEXT('BR_CTX_G','CURRENT_SCHEMA')) AND package_name = :2 AND type_name = :3
ORDER BY attr_no`
rows, err := db.DB.QueryContext(ctx, qry, obj.Owner, obj.Package, obj.Name)
if err != nil {
return nil, fmt.Errorf("%s [%q, %q, %q]: %w", qry, obj.Owner, obj.Package, obj.Name, err)
}
defer rows.Close()
for rows.Next() {
var a Attribute
if err = rows.Scan(
&a.Name,
&a.Type.Object.Owner, &a.Type.Object.Package, &a.Type.Object.Name,
&a.Type.Length, &a.Type.Precision, &a.Type.Scale,
); err != nil {
return nil, fmt.Errorf("%s [%q]: %w", qry, name, err)
}
if a.Type.IsObject = a.Type.Owner != ""; a.Type.IsObject {
sub, err := db.ReadObject(ctx, a.Type.Triplet)
if err != nil {
return nil, err
}
a.Type.Object = *sub
}
obj.Attributes = append(obj.Attributes, a)
}
rows.Close()
if err = rows.Err(); err != nil {
return nil, err
}
} else if obj.IsCollection = typ == "COLLECTION"; obj.IsCollection {
const qry = `SELECT coll_type,
elem_type_owner, elem_type_package, elem_type_name,
length, precision, scale, index_by
FROM all_plsql_coll_types
WHERE owner = NVL(:1, SYS_CONTEXT('BR_CTX_G','CURRENT_SCHEMA')) AND package_name = :2 AND type_name = :3`
var elem ObjectOrScalar
if err := db.DB.QueryRowContext(ctx, qry, obj.Owner, obj.Package, obj.Name).Scan(
&typ,
&elem.Owner, &elem.Package, &elem.Name,
&elem.Length, &elem.Precision, &elem.Scale, &elem.IndexBy,
); err != nil {
return nil, fmt.Errorf("%s [%q, %q, %q]: %w", qry, obj.Owner, obj.Package, obj.Name, err)
}
if elem.IsObject = elem.Owner != ""; elem.IsObject {
sub, err := db.ReadObject(ctx, elem.Triplet)
if err != nil {
return nil, err
}
elem.Object = *sub
}
obj.CollectionOf = &elem
}
db.mu.Lock()
defer db.mu.Unlock()
if db.objCache == nil {
db.objCache = make(map[Triplet]*Object)
}
db.objCache[obj.Triplet] = obj
return obj, nil
}
func splitOwner(name string) (string, string) {
if i := strings.IndexByte(name, '.'); i >= 0 {
return name[:i], name[i+1:]
}
return "", name
}
type querier interface {
QueryContext(context.Context, string, ...any) (rowser, error)
QueryRowContext(context.Context, string, ...any) rower
}
type rowser interface {
Close() error
Next() bool
Err() error
Scan(...any) error
}
type rower interface {
Scan(...any) error
}
type SqlDB struct {
*sql.DB
LogQry func(qry string, args ...any) (next func(...any), close func())
}
func (db SqlDB) QueryContext(ctx context.Context, qry string, args ...any) (rowser, error) {
rows, err := db.DB.QueryContext(ctx, qry, args...)
if err != nil || db.LogQry == nil {
return nil, err
}
next, close := db.LogQry(qry, args...)
return sqlRows{Rows: rows, logRow: next, logClose: close}, nil
}
func (db SqlDB) QueryRowContext(ctx context.Context, qry string, args ...any) rower {
row := db.DB.QueryRowContext(ctx, qry, args...)
if db.LogQry == nil {
return row
}
next, close := db.LogQry(qry, args...)
return sqlRow{Row: row, logRow: next, logClose: close}
}
type sqlRows struct {
*sql.Rows
logRow func(...any)
logClose func()
}
func (rows sqlRows) Scan(args ...any) error {
if err := rows.Rows.Scan(args...); err != nil {
return err
}
rows.logRow(args...)
return nil
}
func (rows sqlRows) Close() error {
err := rows.Rows.Close()
rows.logClose()
return err
}
type sqlRow struct {
*sql.Row
logRow func(...any)
logClose func()
}
func (row sqlRow) Scan(args ...any) error {
if err := row.Row.Scan(args...); err != nil {
return err
}
row.logRow(args...)
row.logClose()
return nil
}
func UnoCap(text string) string {
i := strings.Index(text, "_")
if i == 0 {
return capitalize(text)
}
return strings.ToUpper(text[:i]) + "_" + strings.ToLower(text[i+1:])
}
func capitalize(text string) string {
if text == "" {
return text
}
return strings.ToUpper(text[:1]) + strings.ToLower(text[1:])
}