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package sqlite
import (
"errors"
"fmt"
"sync"
"unsafe"
"modernc.org/libc"
"modernc.org/libc/sys/types"
sqlite3 "modernc.org/sqlite/lib"
)
var (
xPreUpdateHandlers = struct {
mu sync.RWMutex
m map[uintptr]func(SQLitePreUpdateData)
}{
m: make(map[uintptr]func(SQLitePreUpdateData)),
}
xCommitHandlers = struct {
mu sync.RWMutex
m map[uintptr]CommitHookFn
}{
m: make(map[uintptr]CommitHookFn),
}
xRollbackHandlers = struct {
mu sync.RWMutex
m map[uintptr]RollbackHookFn
}{
m: make(map[uintptr]RollbackHookFn),
}
)
type PreUpdateHookFn func(SQLitePreUpdateData)
func (c *conn) RegisterPreUpdateHook(callback PreUpdateHookFn) {
if callback == nil {
xPreUpdateHandlers.mu.Lock()
delete(xPreUpdateHandlers.m, c.db)
xPreUpdateHandlers.mu.Unlock()
sqlite3.Xsqlite3_preupdate_hook(c.tls, c.db, uintptr(unsafe.Pointer(nil)), uintptr(unsafe.Pointer(nil)))
return
}
xPreUpdateHandlers.mu.Lock()
xPreUpdateHandlers.m[c.db] = callback
xPreUpdateHandlers.mu.Unlock()
sqlite3.Xsqlite3_preupdate_hook(c.tls, c.db, cFuncPointer(preUpdateHookTrampoline), c.db)
}
type CommitHookFn func() int32
func (c *conn) RegisterCommitHook(callback CommitHookFn) {
if callback == nil {
xCommitHandlers.mu.Lock()
delete(xCommitHandlers.m, c.db)
xCommitHandlers.mu.Unlock()
sqlite3.Xsqlite3_commit_hook(c.tls, c.db, uintptr(unsafe.Pointer(nil)), uintptr(unsafe.Pointer(nil)))
return
}
xCommitHandlers.mu.Lock()
xCommitHandlers.m[c.db] = callback
xCommitHandlers.mu.Unlock()
sqlite3.Xsqlite3_commit_hook(c.tls, c.db, cFuncPointer(commitHookTrampoline), c.db)
}
type RollbackHookFn func()
func (c *conn) RegisterRollbackHook(callback RollbackHookFn) {
if callback == nil {
xRollbackHandlers.mu.Lock()
delete(xRollbackHandlers.m, c.db)
xRollbackHandlers.mu.Unlock()
sqlite3.Xsqlite3_rollback_hook(c.tls, c.db, uintptr(unsafe.Pointer(nil)), uintptr(unsafe.Pointer(nil)))
return
}
xRollbackHandlers.mu.Lock()
xRollbackHandlers.m[c.db] = callback
xRollbackHandlers.mu.Unlock()
sqlite3.Xsqlite3_rollback_hook(c.tls, c.db, cFuncPointer(rollbackHookTrampoline), c.db)
}
type SQLitePreUpdateData struct {
tls *libc.TLS
pCsr uintptr
Op int32
DatabaseName string
TableName string
OldRowID int64
NewRowID int64
}
// Depth returns the source path of the write, see sqlite3_preupdate_depth()
func (d *SQLitePreUpdateData) Depth() int {
return int(sqlite3.Xsqlite3_preupdate_depth(d.tls, d.pCsr))
}
// Count returns the number of columns in the row
func (d *SQLitePreUpdateData) Count() int {
return int(sqlite3.Xsqlite3_preupdate_count(d.tls, d.pCsr))
}
func (d *SQLitePreUpdateData) row(dest []any, new bool) error {
count := d.Count()
ppValue, err := mallocValue(d.tls)
if err != nil {
return err
}
defer libc.Xfree(d.tls, ppValue)
for i := 0; i < count && i < len(dest); i++ {
val, err := d.value(ppValue, i, new)
if err != nil {
return err
}
err = convertAssign(&dest[i], val)
if err != nil {
return err
}
}
return nil
}
// Old populates dest with the row data to be replaced. This works similar to
// database/sql's Rows.Scan()
func (d *SQLitePreUpdateData) Old(dest ...any) error {
if d.Op == sqlite3.SQLITE_INSERT {
return errors.New("there is no old row for INSERT operations")
}
return d.row(dest, false)
}
// New populates dest with the replacement row data. This works similar to
// database/sql's Rows.Scan()
func (d *SQLitePreUpdateData) New(dest ...any) error {
if d.Op == sqlite3.SQLITE_DELETE {
return errors.New("there is no new row for DELETE operations")
}
return d.row(dest, true)
}
const ptrValSize = types.Size_t(unsafe.Sizeof(&sqlite3.Sqlite3_value{}))
func mallocValue(tls *libc.TLS) (uintptr, error) {
p := libc.Xmalloc(tls, ptrValSize)
if p == 0 {
return 0, fmt.Errorf("out of memory")
}
return p, nil
}
func (d *SQLitePreUpdateData) value(ppValue uintptr, i int, new bool) (any, error) {
var src any
if new {
sqlite3.Xsqlite3_preupdate_new(d.tls, d.pCsr, int32(i), ppValue)
} else {
sqlite3.Xsqlite3_preupdate_old(d.tls, d.pCsr, int32(i), ppValue)
}
ptrValue := *(*uintptr)(unsafe.Pointer(ppValue))
switch sqlite3.Xsqlite3_value_type(d.tls, ptrValue) {
case sqlite3.SQLITE_INTEGER:
src = int64(sqlite3.Xsqlite3_value_int64(d.tls, ptrValue))
case sqlite3.SQLITE_FLOAT:
src = float64(sqlite3.Xsqlite3_value_double(d.tls, ptrValue))
case sqlite3.SQLITE_BLOB:
size := sqlite3.Xsqlite3_value_bytes(d.tls, ptrValue)
blobPtr := sqlite3.Xsqlite3_value_blob(d.tls, ptrValue)
var v []byte
if size != 0 {
v = make([]byte, size)
copy(v, (*libc.RawMem)(unsafe.Pointer(blobPtr))[:size:size])
}
src = v
case sqlite3.SQLITE_TEXT:
src = libc.GoString(sqlite3.Xsqlite3_value_text(d.tls, ptrValue))
case sqlite3.SQLITE_NULL:
src = nil
}
return src, nil
}
func preUpdateHookTrampoline(tls *libc.TLS, handle uintptr, pCsr uintptr, op int32, zDb uintptr, pTab uintptr, iKey1 int64, iReg int32, iBlobWrite int32) {
xPreUpdateHandlers.mu.RLock()
xPreUpdateHandler := xPreUpdateHandlers.m[handle]
xPreUpdateHandlers.mu.RUnlock()
if xPreUpdateHandler == nil {
return
}
data := SQLitePreUpdateData{
tls: tls,
pCsr: pCsr,
Op: op,
DatabaseName: libc.GoString(zDb),
TableName: libc.GoString(pTab),
OldRowID: iKey1,
NewRowID: int64(iReg),
}
xPreUpdateHandler(data)
}
func commitHookTrampoline(tls *libc.TLS, handle uintptr, pCsr uintptr) int32 {
xCommitHandlers.mu.RLock()
xCommitHandler := xCommitHandlers.m[handle]
xCommitHandlers.mu.RUnlock()
if xCommitHandler == nil {
return 0
}
return xCommitHandler()
}
func rollbackHookTrampoline(tls *libc.TLS, handle uintptr, pCsr uintptr) {
xRollbackHandlers.mu.RLock()
xRollbackHandler := xRollbackHandlers.m[handle]
xRollbackHandlers.mu.RUnlock()
if xRollbackHandler == nil {
return
}
xRollbackHandler()
}
|
