forked from mirror/go-sqlite3
Move argument converters to callback.go, and optimize return value handling.
A call now doesn't have to do any reflection, it just blindly invokes a bunch of argument and return value handlers to execute the translation, and the safety of the translation is determined at registration time.
This commit is contained in:
David Anderson
parent
cf8fa0af80
commit
122ddb16de
200
callback.go
200
callback.go
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@ -5,12 +5,25 @@
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package sqlite3
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// You can't export a Go function to C and have definitions in the C
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// preamble in the same file, so we have to have callbackTrampoline in
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// its own file. Because we need a separate file anyway, the support
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// code for SQLite custom functions is in here.
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/*
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#include <sqlite3-binding.h>
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void _sqlite3_result_text(sqlite3_context* ctx, const char* s);
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void _sqlite3_result_blob(sqlite3_context* ctx, const void* b, int l);
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*/
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import "C"
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import "unsafe"
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import (
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"errors"
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"fmt"
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"reflect"
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"unsafe"
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)
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//export callbackTrampoline
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func callbackTrampoline(ctx *C.sqlite3_context, argc int, argv **C.sqlite3_value) {
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@ -18,3 +31,188 @@ func callbackTrampoline(ctx *C.sqlite3_context, argc int, argv **C.sqlite3_value
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fi := (*functionInfo)(unsafe.Pointer(C.sqlite3_user_data(ctx)))
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fi.Call(ctx, args)
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}
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// This is only here so that tests can refer to it.
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type callbackArgRaw C.sqlite3_value
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type callbackArgConverter func(*C.sqlite3_value) (reflect.Value, error)
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type callbackArgCast struct {
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f callbackArgConverter
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typ reflect.Type
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}
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func (c callbackArgCast) Run(v *C.sqlite3_value) (reflect.Value, error) {
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val, err := c.f(v)
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if err != nil {
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return reflect.Value{}, err
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}
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if !val.Type().ConvertibleTo(c.typ) {
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return reflect.Value{}, fmt.Errorf("cannot convert %s to %s", val.Type(), c.typ)
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}
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return val.Convert(c.typ), nil
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}
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func callbackArgInt64(v *C.sqlite3_value) (reflect.Value, error) {
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if C.sqlite3_value_type(v) != C.SQLITE_INTEGER {
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return reflect.Value{}, fmt.Errorf("argument must be an INTEGER")
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}
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return reflect.ValueOf(int64(C.sqlite3_value_int64(v))), nil
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}
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func callbackArgBool(v *C.sqlite3_value) (reflect.Value, error) {
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if C.sqlite3_value_type(v) != C.SQLITE_INTEGER {
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return reflect.Value{}, fmt.Errorf("argument must be an INTEGER")
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}
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i := int64(C.sqlite3_value_int64(v))
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val := false
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if i != 0 {
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val = true
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}
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return reflect.ValueOf(val), nil
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}
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func callbackArgFloat64(v *C.sqlite3_value) (reflect.Value, error) {
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if C.sqlite3_value_type(v) != C.SQLITE_FLOAT {
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return reflect.Value{}, fmt.Errorf("argument must be a FLOAT")
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}
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return reflect.ValueOf(float64(C.sqlite3_value_double(v))), nil
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}
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func callbackArgBytes(v *C.sqlite3_value) (reflect.Value, error) {
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switch C.sqlite3_value_type(v) {
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case C.SQLITE_BLOB:
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l := C.sqlite3_value_bytes(v)
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p := C.sqlite3_value_blob(v)
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return reflect.ValueOf(C.GoBytes(p, l)), nil
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case C.SQLITE_TEXT:
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l := C.sqlite3_value_bytes(v)
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c := unsafe.Pointer(C.sqlite3_value_text(v))
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return reflect.ValueOf(C.GoBytes(c, l)), nil
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default:
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return reflect.Value{}, fmt.Errorf("argument must be BLOB or TEXT")
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}
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}
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func callbackArgString(v *C.sqlite3_value) (reflect.Value, error) {
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switch C.sqlite3_value_type(v) {
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case C.SQLITE_BLOB:
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l := C.sqlite3_value_bytes(v)
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p := (*C.char)(C.sqlite3_value_blob(v))
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return reflect.ValueOf(C.GoStringN(p, l)), nil
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case C.SQLITE_TEXT:
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c := (*C.char)(unsafe.Pointer(C.sqlite3_value_text(v)))
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return reflect.ValueOf(C.GoString(c)), nil
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default:
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return reflect.Value{}, fmt.Errorf("argument must be BLOB or TEXT")
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}
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}
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func callbackArg(typ reflect.Type) (callbackArgConverter, error) {
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switch typ.Kind() {
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case reflect.Slice:
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if typ.Elem().Kind() != reflect.Uint8 {
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return nil, errors.New("the only supported slice type is []byte")
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}
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return callbackArgBytes, nil
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case reflect.String:
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return callbackArgString, nil
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case reflect.Bool:
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return callbackArgBool, nil
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case reflect.Int64:
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return callbackArgInt64, nil
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case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Int, reflect.Uint:
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c := callbackArgCast{callbackArgInt64, typ}
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return c.Run, nil
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case reflect.Float64:
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return callbackArgFloat64, nil
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case reflect.Float32:
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c := callbackArgCast{callbackArgFloat64, typ}
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return c.Run, nil
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default:
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return nil, fmt.Errorf("don't know how to convert to %s", typ)
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}
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}
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type callbackRetConverter func(*C.sqlite3_context, reflect.Value) error
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func callbackRetInteger(ctx *C.sqlite3_context, v reflect.Value) error {
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switch v.Type().Kind() {
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case reflect.Int64:
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case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Int, reflect.Uint:
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v = v.Convert(reflect.TypeOf(int64(0)))
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case reflect.Bool:
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b := v.Interface().(bool)
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if b {
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v = reflect.ValueOf(int64(1))
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} else {
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v = reflect.ValueOf(int64(0))
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}
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default:
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return fmt.Errorf("cannot convert %s to INTEGER", v.Type())
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}
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C.sqlite3_result_int64(ctx, C.sqlite3_int64(v.Interface().(int64)))
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return nil
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}
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func callbackRetFloat(ctx *C.sqlite3_context, v reflect.Value) error {
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switch v.Type().Kind() {
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case reflect.Float64:
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case reflect.Float32:
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v = v.Convert(reflect.TypeOf(float64(0)))
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default:
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return fmt.Errorf("cannot convert %s to FLOAT", v.Type())
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}
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C.sqlite3_result_double(ctx, C.double(v.Interface().(float64)))
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return nil
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}
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func callbackRetBlob(ctx *C.sqlite3_context, v reflect.Value) error {
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if v.Type().Kind() != reflect.Slice || v.Type().Elem().Kind() != reflect.Uint8 {
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return fmt.Errorf("cannot convert %s to BLOB", v.Type())
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}
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i := v.Interface()
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if i == nil || len(i.([]byte)) == 0 {
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C.sqlite3_result_null(ctx)
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} else {
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bs := i.([]byte)
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C._sqlite3_result_blob(ctx, unsafe.Pointer(&bs[0]), C.int(len(bs)))
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}
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return nil
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}
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func callbackRetText(ctx *C.sqlite3_context, v reflect.Value) error {
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if v.Type().Kind() != reflect.String {
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return fmt.Errorf("cannot convert %s to TEXT", v.Type())
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}
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C._sqlite3_result_text(ctx, C.CString(v.Interface().(string)))
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return nil
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}
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func callbackRet(typ reflect.Type) (callbackRetConverter, error) {
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switch typ.Kind() {
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case reflect.Slice:
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if typ.Elem().Kind() != reflect.Uint8 {
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return nil, errors.New("the only supported slice type is []byte")
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}
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return callbackRetBlob, nil
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case reflect.String:
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return callbackRetText, nil
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case reflect.Bool, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Int, reflect.Uint:
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return callbackRetInteger, nil
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case reflect.Float32, reflect.Float64:
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return callbackRetFloat, nil
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default:
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return nil, fmt.Errorf("don't know how to convert to %s", typ)
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}
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}
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// Test support code. Tests are not allowed to import "C", so we can't
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// declare any functions that use C.sqlite3_value.
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func callbackSyntheticForTests(v reflect.Value, err error) callbackArgConverter {
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return func(*C.sqlite3_value) (reflect.Value, error) {
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return v, err
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}
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}
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@ -0,0 +1,97 @@
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package sqlite3
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import (
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"errors"
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"math"
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"reflect"
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"testing"
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)
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func TestCallbackArgCast(t *testing.T) {
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intConv := callbackSyntheticForTests(reflect.ValueOf(int64(math.MaxInt64)), nil)
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floatConv := callbackSyntheticForTests(reflect.ValueOf(float64(math.MaxFloat64)), nil)
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errConv := callbackSyntheticForTests(reflect.Value{}, errors.New("test"))
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tests := []struct {
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f callbackArgConverter
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o reflect.Value
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}{
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{intConv, reflect.ValueOf(int8(-1))},
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{intConv, reflect.ValueOf(int16(-1))},
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{intConv, reflect.ValueOf(int32(-1))},
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{intConv, reflect.ValueOf(uint8(math.MaxUint8))},
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{intConv, reflect.ValueOf(uint16(math.MaxUint16))},
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{intConv, reflect.ValueOf(uint32(math.MaxUint32))},
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// Special case, int64->uint64 is only 1<<63 - 1, not 1<<64 - 1
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{intConv, reflect.ValueOf(uint64(math.MaxInt64))},
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{floatConv, reflect.ValueOf(float32(math.Inf(1)))},
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}
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for _, test := range tests {
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conv := callbackArgCast{test.f, test.o.Type()}
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val, err := conv.Run(nil)
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if err != nil {
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t.Errorf("Couldn't convert to %s: %s", test.o.Type(), err)
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} else if !reflect.DeepEqual(val.Interface(), test.o.Interface()) {
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t.Errorf("Unexpected result from converting to %s: got %v, want %v", test.o.Type(), val.Interface(), test.o.Interface())
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}
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}
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conv := callbackArgCast{errConv, reflect.TypeOf(int8(0))}
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_, err := conv.Run(nil)
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if err == nil {
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t.Errorf("Expected error during callbackArgCast, but got none")
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}
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}
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func TestCallbackConverters(t *testing.T) {
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tests := []struct {
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v interface{}
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err bool
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}{
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// Unfortunately, we can't tell which converter was returned,
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// but we can at least check which types can be converted.
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{[]byte{0}, false},
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{"text", false},
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{true, false},
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{int8(0), false},
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{int16(0), false},
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{int32(0), false},
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{int64(0), false},
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{uint8(0), false},
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{uint16(0), false},
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{uint32(0), false},
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{uint64(0), false},
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{int(0), false},
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{uint(0), false},
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{float64(0), false},
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{float32(0), false},
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{func() {}, true},
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{complex64(complex(0, 0)), true},
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{complex128(complex(0, 0)), true},
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{struct{}{}, true},
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{map[string]string{}, true},
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{[]string{}, true},
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{(*int8)(nil), true},
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{make(chan int), true},
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}
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for _, test := range tests {
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_, err := callbackArg(reflect.TypeOf(test.v))
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if test.err && err == nil {
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t.Errorf("Expected an error when converting %s, got no error", reflect.TypeOf(test.v))
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} else if !test.err && err != nil {
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t.Errorf("Expected converter when converting %s, got error: %s", reflect.TypeOf(test.v), err)
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}
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}
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for _, test := range tests {
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_, err := callbackRet(reflect.TypeOf(test.v))
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if test.err && err == nil {
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t.Errorf("Expected an error when converting %s, got no error", reflect.TypeOf(test.v))
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} else if !test.err && err != nil {
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t.Errorf("Expected converter when converting %s, got error: %s", reflect.TypeOf(test.v), err)
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}
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}
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}
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122
sqlite3.go
122
sqlite3.go
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@ -166,7 +166,8 @@ type SQLiteRows struct {
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type functionInfo struct {
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f reflect.Value
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argConverters []func(*C.sqlite3_value) (reflect.Value, error)
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argConverters []callbackArgConverter
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retConverter callbackRetConverter
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}
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func (fi *functionInfo) error(ctx *C.sqlite3_context, err error) {
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@ -193,58 +194,11 @@ func (fi *functionInfo) Call(ctx *C.sqlite3_context, argv []*C.sqlite3_value) {
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return
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}
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res := ret[0].Interface()
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// Normalize ret to one of the types sqlite knows.
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switch r := res.(type) {
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case int64, float64, []byte, string:
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// Already the right type
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case bool:
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if r {
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res = int64(1)
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} else {
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res = int64(0)
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}
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case int:
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res = int64(r)
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case uint:
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res = int64(r)
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case uint8:
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res = int64(r)
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case uint16:
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res = int64(r)
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case uint32:
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res = int64(r)
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case uint64:
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res = int64(r)
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case int8:
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res = int64(r)
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case int16:
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res = int64(r)
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case int32:
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res = int64(r)
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case float32:
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res = float64(r)
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default:
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fi.error(ctx, errors.New("cannot convert returned type to sqlite type"))
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err := fi.retConverter(ctx, ret[0])
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if err != nil {
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fi.error(ctx, err)
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return
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}
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switch r := res.(type) {
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case int64:
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C.sqlite3_result_int64(ctx, C.sqlite3_int64(r))
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case float64:
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C.sqlite3_result_double(ctx, C.double(r))
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case []byte:
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if len(r) == 0 {
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C.sqlite3_result_null(ctx)
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} else {
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C._sqlite3_result_blob(ctx, unsafe.Pointer(&r[0]), C.int(len(r)))
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}
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case string:
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C._sqlite3_result_text(ctx, C.CString(r))
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default:
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panic("unreachable")
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}
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}
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// Commit transaction.
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@ -261,10 +215,10 @@ func (tx *SQLiteTx) Rollback() error {
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// RegisterFunc makes a Go function available as a SQLite function.
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//
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// The function must accept only arguments of type int64, float64,
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// []byte or string, and return one value of any numeric type except
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// complex, bool, []byte or string. Optionally, an error can be
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// provided as a second return value.
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// The function can accept arguments of any real numeric type
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// (i.e. not complex), as well as []byte and string. It must return a
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// value of one of those types, and optionally an error as a second
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// value.
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//
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// If pure is true. SQLite will assume that the function's return
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// value depends only on its inputs, and make more aggressive
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@ -287,59 +241,19 @@ func (c *SQLiteConn) RegisterFunc(name string, impl interface{}, pure bool) erro
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}
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for i := 0; i < t.NumIn(); i++ {
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arg := t.In(i)
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var conv func(*C.sqlite3_value) (reflect.Value, error)
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switch arg.Kind() {
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case reflect.Int64:
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conv = func(v *C.sqlite3_value) (reflect.Value, error) {
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if C.sqlite3_value_type(v) != C.SQLITE_INTEGER {
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return reflect.Value{}, fmt.Errorf("Argument %d to %s must be an INTEGER", i+1, name)
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}
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return reflect.ValueOf(int64(C.sqlite3_value_int64(v))), nil
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}
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case reflect.Float64:
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conv = func(v *C.sqlite3_value) (reflect.Value, error) {
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if C.sqlite3_value_type(v) != C.SQLITE_FLOAT {
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return reflect.Value{}, fmt.Errorf("Argument %d to %s must be a FLOAT", i+1, name)
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}
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return reflect.ValueOf(float64(C.sqlite3_value_double(v))), nil
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}
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case reflect.Slice:
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if arg.Elem().Kind() != reflect.Uint8 {
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return errors.New("The only supported slice type is []byte")
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}
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conv = func(v *C.sqlite3_value) (reflect.Value, error) {
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switch C.sqlite3_value_type(v) {
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case C.SQLITE_BLOB:
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l := C.sqlite3_value_bytes(v)
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p := C.sqlite3_value_blob(v)
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return reflect.ValueOf(C.GoBytes(p, l)), nil
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case C.SQLITE_TEXT:
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l := C.sqlite3_value_bytes(v)
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c := unsafe.Pointer(C.sqlite3_value_text(v))
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return reflect.ValueOf(C.GoBytes(c, l)), nil
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default:
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return reflect.Value{}, fmt.Errorf("Argument %d to %s must be BLOB or TEXT", i+1, name)
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}
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}
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case reflect.String:
|
||||
conv = func(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 %d to %s must be BLOB or TEXT", i+1, name)
|
||||
}
|
||||
}
|
||||
conv, err := callbackArg(t.In(i))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
fi.argConverters = append(fi.argConverters, conv)
|
||||
}
|
||||
|
||||
conv, err := callbackRet(t.Out(0))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
fi.retConverter = conv
|
||||
|
||||
// fi must outlast the database connection, or we'll have dangling pointers.
|
||||
c.funcs = append(c.funcs, &fi)
|
||||
|
||||
|
|
|
|||
|
|
@ -15,6 +15,7 @@ import (
|
|||
"net/url"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"reflect"
|
||||
"regexp"
|
||||
"strings"
|
||||
"sync"
|
||||
|
|
@ -1060,25 +1061,41 @@ func TestDateTimeNow(t *testing.T) {
|
|||
}
|
||||
|
||||
func TestFunctionRegistration(t *testing.T) {
|
||||
custom_add := func(a, b int64) (int64, error) {
|
||||
return a + b, nil
|
||||
}
|
||||
custom_regex := func(s, re string) bool {
|
||||
matched, err := regexp.MatchString(re, s)
|
||||
if err != nil {
|
||||
// We should really return the error here, but this
|
||||
// function is also testing single return value functions.
|
||||
panic("Bad regexp")
|
||||
}
|
||||
return matched
|
||||
addi_8_16_32 := func(a int8, b int16) int32 { return int32(a) + int32(b) }
|
||||
addi_64 := func(a, b int64) int64 { return a + b }
|
||||
addu_8_16_32 := func(a uint8, b uint16) uint32 { return uint32(a) + uint32(b) }
|
||||
addu_64 := func(a, b uint64) uint64 { return a + b }
|
||||
addiu := func(a int, b uint) int64 { return int64(a) + int64(b) }
|
||||
addf_32_64 := func(a float32, b float64) float64 { return float64(a) + b }
|
||||
not := func(a bool) bool { return !a }
|
||||
regex := func(re, s string) (bool, error) {
|
||||
return regexp.MatchString(re, s)
|
||||
}
|
||||
|
||||
sql.Register("sqlite3_FunctionRegistration", &SQLiteDriver{
|
||||
ConnectHook: func(conn *SQLiteConn) error {
|
||||
if err := conn.RegisterFunc("custom_add", custom_add, true); err != nil {
|
||||
if err := conn.RegisterFunc("addi_8_16_32", addi_8_16_32, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("regexp", custom_regex, true); err != nil {
|
||||
if err := conn.RegisterFunc("addi_64", addi_64, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("addu_8_16_32", addu_8_16_32, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("addu_64", addu_64, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("addiu", addiu, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("addf_32_64", addf_32_64, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("not", not, true); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := conn.RegisterFunc("regex", regex, true); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
|
|
@ -1090,42 +1107,29 @@ func TestFunctionRegistration(t *testing.T) {
|
|||
}
|
||||
defer db.Close()
|
||||
|
||||
additions := []struct {
|
||||
a, b, c int64
|
||||
ops := []struct {
|
||||
query string
|
||||
expected interface{}
|
||||
}{
|
||||
{1, 1, 2},
|
||||
{1, 3, 4},
|
||||
{1, -1, 0},
|
||||
{"SELECT addi_8_16_32(1,2)", int32(3)},
|
||||
{"SELECT addi_64(1,2)", int64(3)},
|
||||
{"SELECT addu_8_16_32(1,2)", uint32(3)},
|
||||
{"SELECT addu_64(1,2)", uint64(3)},
|
||||
{"SELECT addiu(1,2)", int64(3)},
|
||||
{"SELECT addf_32_64(1.5,1.5)", float64(3)},
|
||||
{"SELECT not(1)", false},
|
||||
{"SELECT not(0)", true},
|
||||
{`SELECT regex("^foo.*", "foobar")`, true},
|
||||
{`SELECT regex("^foo.*", "barfoobar")`, false},
|
||||
}
|
||||
|
||||
for _, add := range additions {
|
||||
var i int64
|
||||
err = db.QueryRow("SELECT custom_add($1, $2)", add.a, add.b).Scan(&i)
|
||||
for _, op := range ops {
|
||||
ret := reflect.New(reflect.TypeOf(op.expected))
|
||||
err = db.QueryRow(op.query).Scan(ret.Interface())
|
||||
if err != nil {
|
||||
t.Fatal("Failed to call custom_add:", err)
|
||||
}
|
||||
if i != add.c {
|
||||
t.Fatalf("custom_add returned the wrong value, got %d, want %d", i, add.c)
|
||||
}
|
||||
}
|
||||
|
||||
regexes := []struct {
|
||||
re, in string
|
||||
out bool
|
||||
}{
|
||||
{".*", "foo", true},
|
||||
{"^foo.*", "foobar", true},
|
||||
{"^foo.*", "barfoo", false},
|
||||
}
|
||||
|
||||
for _, re := range regexes {
|
||||
var b bool
|
||||
err = db.QueryRow("SELECT regexp($1, $2)", re.in, re.re).Scan(&b)
|
||||
if err != nil {
|
||||
t.Fatal("Failed to call regexp:", err)
|
||||
}
|
||||
if b != re.out {
|
||||
t.Fatalf("regexp returned the wrong value, got %v, want %v", b, re.out)
|
||||
t.Errorf("Query %q failed: %s", op.query, err)
|
||||
} else if !reflect.DeepEqual(ret.Elem().Interface(), op.expected) {
|
||||
t.Errorf("Query %q returned wrong value: got %v (%T), want %v (%T)", op.query, ret.Elem().Interface(), ret.Elem().Interface(), op.expected, op.expected)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1134,8 +1138,8 @@ var customFunctionOnce sync.Once
|
|||
|
||||
func BenchmarkCustomFunctions(b *testing.B) {
|
||||
customFunctionOnce.Do(func() {
|
||||
custom_add := func(a, b int64) (int64, error) {
|
||||
return a + b, nil
|
||||
custom_add := func(a, b int64) int64 {
|
||||
return a + b
|
||||
}
|
||||
|
||||
sql.Register("sqlite3_BenchmarkCustomFunctions", &SQLiteDriver{
|
||||
|
|
|
|||
Loading…
Reference in New Issue