1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
package bun
import (
"context"
"fmt"
"reflect"
"strings"
)
func indirect(v reflect.Value) reflect.Value {
switch v.Kind() {
case reflect.Interface:
return indirect(v.Elem())
case reflect.Ptr:
return v.Elem()
default:
return v
}
}
func walk(v reflect.Value, index []int, fn func(reflect.Value)) {
v = reflect.Indirect(v)
switch v.Kind() {
case reflect.Slice:
sliceLen := v.Len()
for i := 0; i < sliceLen; i++ {
visitField(v.Index(i), index, fn)
}
default:
visitField(v, index, fn)
}
}
func visitField(v reflect.Value, index []int, fn func(reflect.Value)) {
v = reflect.Indirect(v)
if len(index) > 0 {
v = v.Field(index[0])
if v.Kind() == reflect.Ptr && v.IsNil() {
return
}
walk(v, index[1:], fn)
} else {
fn(v)
}
}
func typeByIndex(t reflect.Type, index []int) reflect.Type {
for _, x := range index {
switch t.Kind() {
case reflect.Ptr:
t = t.Elem()
case reflect.Slice:
t = indirectType(t.Elem())
}
t = t.Field(x).Type
}
return indirectType(t)
}
func indirectType(t reflect.Type) reflect.Type {
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
return t
}
func sliceElemType(v reflect.Value) reflect.Type {
elemType := v.Type().Elem()
if elemType.Kind() == reflect.Interface && v.Len() > 0 {
return indirect(v.Index(0).Elem()).Type()
}
return indirectType(elemType)
}
// appendComment adds comment in the header of the query into buffer
func appendComment(b []byte, name string) []byte {
if name == "" {
return b
}
name = strings.Map(func(r rune) rune {
if r == '\x00' {
return -1
}
return r
}, name)
name = strings.ReplaceAll(name, `/*`, `/\*`)
name = strings.ReplaceAll(name, `*/`, `*\/`)
return append(b, fmt.Sprintf("/* %s */ ", name)...)
}
// queryCommentCtxKey is a context key for setting a query comment on a context instead of calling the Comment("...") API directly
type queryCommentCtxKey struct{}
// WithComment returns a context that includes a comment that may be included in a query for debugging
//
// If a context with an attached query is used, a comment set by the Comment("...") API will be overwritten.
func WithComment(ctx context.Context, comment string) context.Context {
return context.WithValue(ctx, queryCommentCtxKey{}, comment)
}
// commenter describes the Comment interface implemented by all of the query types
type commenter[T any] interface {
Comment(string) T
}
// setCommentFromContext sets the comment on the given query from the supplied context if one is set using the Comment(...) method.
func setCommentFromContext[T any](ctx context.Context, q commenter[T]) {
s, _ := ctx.Value(queryCommentCtxKey{}).(string)
if s != "" {
q.Comment(s)
}
}
|
