104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// Copyright 2019-present Facebook Inc. All rights reserved.
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// This source code is licensed under the Apache 2.0 license found
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// in the LICENSE file in the root directory of this source tree.
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package schema
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import (
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"database/sql/driver"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"math/big"
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"net/url"
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"strings"
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"entgo.io/ent"
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"entgo.io/ent/dialect/sql"
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"entgo.io/ent/schema/field"
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)
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// ExValueScan holds the schema definition for the ExValueScan entity.
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type ExValueScan struct {
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ent.Schema
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}
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// Fields of the ExValueScan.
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func (ExValueScan) Fields() []ent.Field {
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return []ent.Field{
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field.String("binary").
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GoType(&url.URL{}).
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ValueScanner(field.BinaryValueScanner[*url.URL]{}),
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field.Bytes("binary_bytes").
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GoType(&url.URL{}).
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ValueScanner(field.BinaryValueScanner[*url.URL]{}),
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field.String("binary_optional").
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Optional().
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GoType(&url.URL{}).
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ValueScanner(field.BinaryValueScanner[*url.URL]{}),
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field.String("text").
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GoType(&big.Int{}).
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ValueScanner(field.TextValueScanner[*big.Int]{}),
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field.String("text_optional").
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Optional().
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GoType(&big.Int{}).
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ValueScanner(field.TextValueScanner[*big.Int]{}),
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field.String("base64").
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ValueScanner(field.ValueScannerFunc[string, *sql.NullString]{
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V: func(s string) (driver.Value, error) {
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return base64.StdEncoding.EncodeToString([]byte(s)), nil
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},
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S: func(ns *sql.NullString) (string, error) {
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if !ns.Valid {
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return "", nil
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}
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b, err := base64.StdEncoding.DecodeString(ns.String)
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if err != nil {
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return "", err
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}
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return string(b), nil
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},
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}),
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field.String("custom").
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ValueScanner(PrefixedHex{
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prefix: "0x",
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}),
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field.String("custom_optional").
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Optional().
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ValueScanner(PrefixedHex{
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prefix: "0X",
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}),
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}
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}
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// PrefixedHex is a custom type that implements the ValueScanner interface.
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type PrefixedHex struct {
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prefix string
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}
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// Value implements the TypeValueScanner.Value method.
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func (p PrefixedHex) Value(s string) (driver.Value, error) {
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return p.prefix + ":" + hex.EncodeToString([]byte(s)), nil
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}
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// ScanValue implements the TypeValueScanner.ScanValue method.
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func (PrefixedHex) ScanValue() field.ValueScanner {
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return &sql.NullString{}
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}
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// FromValue implements the TypeValueScanner.FromValue method.
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func (p PrefixedHex) FromValue(v driver.Value) (string, error) {
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s, ok := v.(*sql.NullString)
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if !ok {
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return "", fmt.Errorf("unexpected input for FromValue: %T", v)
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}
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if !s.Valid {
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return "", nil
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}
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d, err := hex.DecodeString(strings.TrimPrefix(s.String, p.prefix+":"))
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if err != nil {
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return "", err
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}
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return string(d), nil
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}
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