mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-30 08:03:52 +03:00
340 lines
9.4 KiB
Go
340 lines
9.4 KiB
Go
// Copyright (C) 2014 Yasuhiro Matsumoto <mattn.jp@gmail.com>.
|
|
//
|
|
// Use of this source code is governed by an MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package sqlite3
|
|
|
|
// You can't export a Go function to C and have definitions in the C
|
|
// preamble in the same file, so we have to have callbackTrampoline in
|
|
// its own file. Because we need a separate file anyway, the support
|
|
// code for SQLite custom functions is in here.
|
|
|
|
/*
|
|
#ifndef USE_LIBSQLITE3
|
|
#include <sqlite3-binding.h>
|
|
#else
|
|
#include <sqlite3.h>
|
|
#endif
|
|
#include <stdlib.h>
|
|
|
|
void _sqlite3_result_text(sqlite3_context* ctx, const char* s);
|
|
void _sqlite3_result_blob(sqlite3_context* ctx, const void* b, int l);
|
|
*/
|
|
import "C"
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"reflect"
|
|
"sync"
|
|
"unsafe"
|
|
)
|
|
|
|
//export callbackTrampoline
|
|
func callbackTrampoline(ctx *C.sqlite3_context, argc int, argv **C.sqlite3_value) {
|
|
args := (*[(math.MaxInt32 - 1) / unsafe.Sizeof((*C.sqlite3_value)(nil))]*C.sqlite3_value)(unsafe.Pointer(argv))[:argc:argc]
|
|
fi := lookupHandle(uintptr(C.sqlite3_user_data(ctx))).(*functionInfo)
|
|
fi.Call(ctx, args)
|
|
}
|
|
|
|
//export stepTrampoline
|
|
func stepTrampoline(ctx *C.sqlite3_context, argc C.int, argv **C.sqlite3_value) {
|
|
args := (*[(math.MaxInt32 - 1) / unsafe.Sizeof((*C.sqlite3_value)(nil))]*C.sqlite3_value)(unsafe.Pointer(argv))[:int(argc):int(argc)]
|
|
ai := lookupHandle(uintptr(C.sqlite3_user_data(ctx))).(*aggInfo)
|
|
ai.Step(ctx, args)
|
|
}
|
|
|
|
//export doneTrampoline
|
|
func doneTrampoline(ctx *C.sqlite3_context) {
|
|
handle := uintptr(C.sqlite3_user_data(ctx))
|
|
ai := lookupHandle(handle).(*aggInfo)
|
|
ai.Done(ctx)
|
|
}
|
|
|
|
// Use handles to avoid passing Go pointers to C.
|
|
|
|
type handleVal struct {
|
|
db *SQLiteConn
|
|
val interface{}
|
|
}
|
|
|
|
var handleLock sync.Mutex
|
|
var handleVals = make(map[uintptr]handleVal)
|
|
var handleIndex uintptr = 100
|
|
|
|
func newHandle(db *SQLiteConn, v interface{}) uintptr {
|
|
handleLock.Lock()
|
|
defer handleLock.Unlock()
|
|
i := handleIndex
|
|
handleIndex++
|
|
handleVals[i] = handleVal{db, v}
|
|
return i
|
|
}
|
|
|
|
func lookupHandle(handle uintptr) interface{} {
|
|
handleLock.Lock()
|
|
defer handleLock.Unlock()
|
|
r, ok := handleVals[handle]
|
|
if !ok {
|
|
if handle >= 100 && handle < handleIndex {
|
|
panic("deleted handle")
|
|
} else {
|
|
panic("invalid handle")
|
|
}
|
|
}
|
|
return r.val
|
|
}
|
|
|
|
func deleteHandles(db *SQLiteConn) {
|
|
handleLock.Lock()
|
|
defer handleLock.Unlock()
|
|
for handle, val := range handleVals {
|
|
if val.db == db {
|
|
delete(handleVals, handle)
|
|
}
|
|
}
|
|
}
|
|
|
|
// This is only here so that tests can refer to it.
|
|
type callbackArgRaw C.sqlite3_value
|
|
|
|
type callbackArgConverter func(*C.sqlite3_value) (reflect.Value, error)
|
|
|
|
type callbackArgCast struct {
|
|
f callbackArgConverter
|
|
typ reflect.Type
|
|
}
|
|
|
|
func (c callbackArgCast) Run(v *C.sqlite3_value) (reflect.Value, error) {
|
|
val, err := c.f(v)
|
|
if err != nil {
|
|
return reflect.Value{}, err
|
|
}
|
|
if !val.Type().ConvertibleTo(c.typ) {
|
|
return reflect.Value{}, fmt.Errorf("cannot convert %s to %s", val.Type(), c.typ)
|
|
}
|
|
return val.Convert(c.typ), nil
|
|
}
|
|
|
|
func callbackArgInt64(v *C.sqlite3_value) (reflect.Value, error) {
|
|
if C.sqlite3_value_type(v) != C.SQLITE_INTEGER {
|
|
return reflect.Value{}, fmt.Errorf("argument must be an INTEGER")
|
|
}
|
|
return reflect.ValueOf(int64(C.sqlite3_value_int64(v))), nil
|
|
}
|
|
|
|
func callbackArgBool(v *C.sqlite3_value) (reflect.Value, error) {
|
|
if C.sqlite3_value_type(v) != C.SQLITE_INTEGER {
|
|
return reflect.Value{}, fmt.Errorf("argument must be an INTEGER")
|
|
}
|
|
i := int64(C.sqlite3_value_int64(v))
|
|
val := false
|
|
if i != 0 {
|
|
val = true
|
|
}
|
|
return reflect.ValueOf(val), nil
|
|
}
|
|
|
|
func callbackArgFloat64(v *C.sqlite3_value) (reflect.Value, error) {
|
|
if C.sqlite3_value_type(v) != C.SQLITE_FLOAT {
|
|
return reflect.Value{}, fmt.Errorf("argument must be a FLOAT")
|
|
}
|
|
return reflect.ValueOf(float64(C.sqlite3_value_double(v))), nil
|
|
}
|
|
|
|
func callbackArgBytes(v *C.sqlite3_value) (reflect.Value, error) {
|
|
switch C.sqlite3_value_type(v) {
|
|
case C.SQLITE_BLOB:
|
|
l := C.sqlite3_value_bytes(v)
|
|
p := C.sqlite3_value_blob(v)
|
|
return reflect.ValueOf(C.GoBytes(p, l)), nil
|
|
case C.SQLITE_TEXT:
|
|
l := C.sqlite3_value_bytes(v)
|
|
c := unsafe.Pointer(C.sqlite3_value_text(v))
|
|
return reflect.ValueOf(C.GoBytes(c, l)), nil
|
|
default:
|
|
return reflect.Value{}, fmt.Errorf("argument must be BLOB or TEXT")
|
|
}
|
|
}
|
|
|
|
func callbackArgString(v *C.sqlite3_value) (reflect.Value, error) {
|
|
switch C.sqlite3_value_type(v) {
|
|
case C.SQLITE_BLOB:
|
|
l := C.sqlite3_value_bytes(v)
|
|
p := (*C.char)(C.sqlite3_value_blob(v))
|
|
return reflect.ValueOf(C.GoStringN(p, l)), nil
|
|
case C.SQLITE_TEXT:
|
|
c := (*C.char)(unsafe.Pointer(C.sqlite3_value_text(v)))
|
|
return reflect.ValueOf(C.GoString(c)), nil
|
|
default:
|
|
return reflect.Value{}, fmt.Errorf("argument must be BLOB or TEXT")
|
|
}
|
|
}
|
|
|
|
func callbackArgGeneric(v *C.sqlite3_value) (reflect.Value, error) {
|
|
switch C.sqlite3_value_type(v) {
|
|
case C.SQLITE_INTEGER:
|
|
return callbackArgInt64(v)
|
|
case C.SQLITE_FLOAT:
|
|
return callbackArgFloat64(v)
|
|
case C.SQLITE_TEXT:
|
|
return callbackArgString(v)
|
|
case C.SQLITE_BLOB:
|
|
return callbackArgBytes(v)
|
|
case C.SQLITE_NULL:
|
|
// Interpret NULL as a nil byte slice.
|
|
var ret []byte
|
|
return reflect.ValueOf(ret), nil
|
|
default:
|
|
panic("unreachable")
|
|
}
|
|
}
|
|
|
|
func callbackArg(typ reflect.Type) (callbackArgConverter, error) {
|
|
switch typ.Kind() {
|
|
case reflect.Interface:
|
|
if typ.NumMethod() != 0 {
|
|
return nil, errors.New("the only supported interface type is interface{}")
|
|
}
|
|
return callbackArgGeneric, nil
|
|
case reflect.Slice:
|
|
if typ.Elem().Kind() != reflect.Uint8 {
|
|
return nil, errors.New("the only supported slice type is []byte")
|
|
}
|
|
return callbackArgBytes, nil
|
|
case reflect.String:
|
|
return callbackArgString, nil
|
|
case reflect.Bool:
|
|
return callbackArgBool, nil
|
|
case reflect.Int64:
|
|
return callbackArgInt64, nil
|
|
case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Int, reflect.Uint:
|
|
c := callbackArgCast{callbackArgInt64, typ}
|
|
return c.Run, nil
|
|
case reflect.Float64:
|
|
return callbackArgFloat64, nil
|
|
case reflect.Float32:
|
|
c := callbackArgCast{callbackArgFloat64, typ}
|
|
return c.Run, nil
|
|
default:
|
|
return nil, fmt.Errorf("don't know how to convert to %s", typ)
|
|
}
|
|
}
|
|
|
|
func callbackConvertArgs(argv []*C.sqlite3_value, converters []callbackArgConverter, variadic callbackArgConverter) ([]reflect.Value, error) {
|
|
var args []reflect.Value
|
|
|
|
if len(argv) < len(converters) {
|
|
return nil, fmt.Errorf("function requires at least %d arguments", len(converters))
|
|
}
|
|
|
|
for i, arg := range argv[:len(converters)] {
|
|
v, err := converters[i](arg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
args = append(args, v)
|
|
}
|
|
|
|
if variadic != nil {
|
|
for _, arg := range argv[len(converters):] {
|
|
v, err := variadic(arg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
args = append(args, v)
|
|
}
|
|
}
|
|
return args, nil
|
|
}
|
|
|
|
type callbackRetConverter func(*C.sqlite3_context, reflect.Value) error
|
|
|
|
func callbackRetInteger(ctx *C.sqlite3_context, v reflect.Value) error {
|
|
switch v.Type().Kind() {
|
|
case reflect.Int64:
|
|
case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Int, reflect.Uint:
|
|
v = v.Convert(reflect.TypeOf(int64(0)))
|
|
case reflect.Bool:
|
|
b := v.Interface().(bool)
|
|
if b {
|
|
v = reflect.ValueOf(int64(1))
|
|
} else {
|
|
v = reflect.ValueOf(int64(0))
|
|
}
|
|
default:
|
|
return fmt.Errorf("cannot convert %s to INTEGER", v.Type())
|
|
}
|
|
|
|
C.sqlite3_result_int64(ctx, C.sqlite3_int64(v.Interface().(int64)))
|
|
return nil
|
|
}
|
|
|
|
func callbackRetFloat(ctx *C.sqlite3_context, v reflect.Value) error {
|
|
switch v.Type().Kind() {
|
|
case reflect.Float64:
|
|
case reflect.Float32:
|
|
v = v.Convert(reflect.TypeOf(float64(0)))
|
|
default:
|
|
return fmt.Errorf("cannot convert %s to FLOAT", v.Type())
|
|
}
|
|
|
|
C.sqlite3_result_double(ctx, C.double(v.Interface().(float64)))
|
|
return nil
|
|
}
|
|
|
|
func callbackRetBlob(ctx *C.sqlite3_context, v reflect.Value) error {
|
|
if v.Type().Kind() != reflect.Slice || v.Type().Elem().Kind() != reflect.Uint8 {
|
|
return fmt.Errorf("cannot convert %s to BLOB", v.Type())
|
|
}
|
|
i := v.Interface()
|
|
if i == nil || len(i.([]byte)) == 0 {
|
|
C.sqlite3_result_null(ctx)
|
|
} else {
|
|
bs := i.([]byte)
|
|
C._sqlite3_result_blob(ctx, unsafe.Pointer(&bs[0]), C.int(len(bs)))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func callbackRetText(ctx *C.sqlite3_context, v reflect.Value) error {
|
|
if v.Type().Kind() != reflect.String {
|
|
return fmt.Errorf("cannot convert %s to TEXT", v.Type())
|
|
}
|
|
C._sqlite3_result_text(ctx, C.CString(v.Interface().(string)))
|
|
return nil
|
|
}
|
|
|
|
func callbackRet(typ reflect.Type) (callbackRetConverter, error) {
|
|
switch typ.Kind() {
|
|
case reflect.Slice:
|
|
if typ.Elem().Kind() != reflect.Uint8 {
|
|
return nil, errors.New("the only supported slice type is []byte")
|
|
}
|
|
return callbackRetBlob, nil
|
|
case reflect.String:
|
|
return callbackRetText, nil
|
|
case reflect.Bool, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Int, reflect.Uint:
|
|
return callbackRetInteger, nil
|
|
case reflect.Float32, reflect.Float64:
|
|
return callbackRetFloat, nil
|
|
default:
|
|
return nil, fmt.Errorf("don't know how to convert to %s", typ)
|
|
}
|
|
}
|
|
|
|
func callbackError(ctx *C.sqlite3_context, err error) {
|
|
cstr := C.CString(err.Error())
|
|
defer C.free(unsafe.Pointer(cstr))
|
|
C.sqlite3_result_error(ctx, cstr, -1)
|
|
}
|
|
|
|
// Test support code. Tests are not allowed to import "C", so we can't
|
|
// declare any functions that use C.sqlite3_value.
|
|
func callbackSyntheticForTests(v reflect.Value, err error) callbackArgConverter {
|
|
return func(*C.sqlite3_value) (reflect.Value, error) {
|
|
return v, err
|
|
}
|
|
}
|