mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-23 04:06:39 +00:00
211 lines
5.2 KiB
Go
211 lines
5.2 KiB
Go
package sql3util
|
|
|
|
import (
|
|
"context"
|
|
_ "embed"
|
|
"sync"
|
|
|
|
"github.com/tetratelabs/wazero"
|
|
"github.com/tetratelabs/wazero/api"
|
|
|
|
"github.com/ncruces/go-sqlite3/internal/util"
|
|
)
|
|
|
|
const (
|
|
errp = 4
|
|
sqlp = 8
|
|
)
|
|
|
|
var (
|
|
//go:embed parse/sql3parse_table.wasm
|
|
binary []byte
|
|
once sync.Once
|
|
runtime wazero.Runtime
|
|
compiled wazero.CompiledModule
|
|
)
|
|
|
|
// ParseTable parses a [CREATE] or [ALTER TABLE] command.
|
|
//
|
|
// [CREATE]: https://sqlite.org/lang_createtable.html
|
|
// [ALTER TABLE]: https://sqlite.org/lang_altertable.html
|
|
func ParseTable(sql string) (_ *Table, err error) {
|
|
once.Do(func() {
|
|
ctx := context.Background()
|
|
cfg := wazero.NewRuntimeConfigInterpreter()
|
|
runtime = wazero.NewRuntimeWithConfig(ctx, cfg)
|
|
compiled, err = runtime.CompileModule(ctx, binary)
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ctx := context.Background()
|
|
mod, err := runtime.InstantiateModule(ctx, compiled, wazero.NewModuleConfig().WithName(""))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer mod.Close(ctx)
|
|
|
|
if buf, ok := mod.Memory().Read(sqlp, uint32(len(sql))); ok {
|
|
copy(buf, sql)
|
|
}
|
|
|
|
stack := [...]uint64{sqlp, uint64(len(sql)), errp}
|
|
err = mod.ExportedFunction("sql3parse_table").CallWithStack(ctx, stack[:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
c, _ := mod.Memory().ReadUint32Le(errp)
|
|
switch c {
|
|
case _MEMORY:
|
|
panic(util.OOMErr)
|
|
case _SYNTAX:
|
|
return nil, util.ErrorString("sql3parse: invalid syntax")
|
|
case _UNSUPPORTEDSQL:
|
|
return nil, util.ErrorString("sql3parse: unsupported SQL")
|
|
}
|
|
|
|
var tab Table
|
|
tab.load(mod, uint32(stack[0]), sql)
|
|
return &tab, nil
|
|
}
|
|
|
|
// Table holds metadata about a table.
|
|
type Table struct {
|
|
Name string
|
|
Schema string
|
|
Comment string
|
|
IsTemporary bool
|
|
IsIfNotExists bool
|
|
IsWithoutRowID bool
|
|
IsStrict bool
|
|
Columns []Column
|
|
Type StatementType
|
|
CurrentName string
|
|
NewName string
|
|
}
|
|
|
|
func (t *Table) load(mod api.Module, ptr uint32, sql string) {
|
|
t.Name = loadString(mod, ptr+0, sql)
|
|
t.Schema = loadString(mod, ptr+8, sql)
|
|
t.Comment = loadString(mod, ptr+16, sql)
|
|
|
|
t.IsTemporary = loadBool(mod, ptr+24)
|
|
t.IsIfNotExists = loadBool(mod, ptr+25)
|
|
t.IsWithoutRowID = loadBool(mod, ptr+26)
|
|
t.IsStrict = loadBool(mod, ptr+27)
|
|
|
|
t.Columns = loadSlice(mod, ptr+28, func(ptr uint32, res *Column) {
|
|
p, _ := mod.Memory().ReadUint32Le(ptr)
|
|
res.load(mod, p, sql)
|
|
})
|
|
|
|
t.Type = loadEnum[StatementType](mod, ptr+44)
|
|
t.CurrentName = loadString(mod, ptr+48, sql)
|
|
t.NewName = loadString(mod, ptr+56, sql)
|
|
}
|
|
|
|
// Column holds metadata about a column.
|
|
type Column struct {
|
|
Name string
|
|
Type string
|
|
Length string
|
|
ConstraintName string
|
|
Comment string
|
|
IsPrimaryKey bool
|
|
IsAutoIncrement bool
|
|
IsNotNull bool
|
|
IsUnique bool
|
|
PKOrder OrderClause
|
|
PKConflictClause ConflictClause
|
|
NotNullConflictClause ConflictClause
|
|
UniqueConflictClause ConflictClause
|
|
CheckExpr string
|
|
DefaultExpr string
|
|
CollateName string
|
|
ForeignKeyClause *ForeignKey
|
|
}
|
|
|
|
func (c *Column) load(mod api.Module, ptr uint32, sql string) {
|
|
c.Name = loadString(mod, ptr+0, sql)
|
|
c.Type = loadString(mod, ptr+8, sql)
|
|
c.Length = loadString(mod, ptr+16, sql)
|
|
c.ConstraintName = loadString(mod, ptr+24, sql)
|
|
c.Comment = loadString(mod, ptr+32, sql)
|
|
|
|
c.IsPrimaryKey = loadBool(mod, ptr+40)
|
|
c.IsAutoIncrement = loadBool(mod, ptr+41)
|
|
c.IsNotNull = loadBool(mod, ptr+42)
|
|
c.IsUnique = loadBool(mod, ptr+43)
|
|
|
|
c.PKOrder = loadEnum[OrderClause](mod, ptr+44)
|
|
c.PKConflictClause = loadEnum[ConflictClause](mod, ptr+48)
|
|
c.NotNullConflictClause = loadEnum[ConflictClause](mod, ptr+52)
|
|
c.UniqueConflictClause = loadEnum[ConflictClause](mod, ptr+56)
|
|
|
|
c.CheckExpr = loadString(mod, ptr+60, sql)
|
|
c.DefaultExpr = loadString(mod, ptr+68, sql)
|
|
c.CollateName = loadString(mod, ptr+76, sql)
|
|
|
|
if ptr, _ := mod.Memory().ReadUint32Le(ptr + 84); ptr != 0 {
|
|
c.ForeignKeyClause = &ForeignKey{}
|
|
c.ForeignKeyClause.load(mod, ptr, sql)
|
|
}
|
|
}
|
|
|
|
type ForeignKey struct {
|
|
Table string
|
|
Columns []string
|
|
OnDelete FKAction
|
|
OnUpdate FKAction
|
|
Match string
|
|
Deferrable FKDefType
|
|
}
|
|
|
|
func (f *ForeignKey) load(mod api.Module, ptr uint32, sql string) {
|
|
f.Table = loadString(mod, ptr+0, sql)
|
|
|
|
f.Columns = loadSlice(mod, ptr+8, func(ptr uint32, res *string) {
|
|
*res = loadString(mod, ptr, sql)
|
|
})
|
|
|
|
f.OnDelete = loadEnum[FKAction](mod, ptr+16)
|
|
f.OnUpdate = loadEnum[FKAction](mod, ptr+20)
|
|
f.Match = loadString(mod, ptr+24, sql)
|
|
f.Deferrable = loadEnum[FKDefType](mod, ptr+32)
|
|
}
|
|
|
|
func loadString(mod api.Module, ptr uint32, sql string) string {
|
|
off, _ := mod.Memory().ReadUint32Le(ptr + 0)
|
|
if off == 0 {
|
|
return ""
|
|
}
|
|
len, _ := mod.Memory().ReadUint32Le(ptr + 4)
|
|
return sql[off-sqlp : off+len-sqlp]
|
|
}
|
|
|
|
func loadSlice[T any](mod api.Module, ptr uint32, fn func(uint32, *T)) []T {
|
|
ref, _ := mod.Memory().ReadUint32Le(ptr + 4)
|
|
if ref == 0 {
|
|
return nil
|
|
}
|
|
len, _ := mod.Memory().ReadUint32Le(ptr + 0)
|
|
res := make([]T, len)
|
|
for i := range res {
|
|
fn(ref, &res[i])
|
|
ref += 4
|
|
}
|
|
return res
|
|
}
|
|
|
|
func loadEnum[T ~uint32](mod api.Module, ptr uint32) T {
|
|
val, _ := mod.Memory().ReadUint32Le(ptr)
|
|
return T(val)
|
|
}
|
|
|
|
func loadBool(mod api.Module, ptr uint32) bool {
|
|
val, _ := mod.Memory().ReadByte(ptr)
|
|
return val != 0
|
|
}
|