/
builder.go
54 lines (48 loc) · 994 Bytes
/
builder.go
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
package search
import "fmt"
// TODO: Add defaults
type Builder struct {
Defaults *Search
}
var DefaultBuilder = Builder{}
func Build(fn func(s *Search) (*Search, error)) (*Search, error) {
return DefaultBuilder.Build(fn)
}
func (b Builder) Build(fn func(s *Search) (*Search, error)) (*Search, error) {
errCh := make(chan error, 2)
var err error
var s *Search
if b.Defaults != nil {
s = b.Defaults.Clone()
} else {
s = NewSearch()
}
s, err = b.try(fn, s, errCh)
if err != nil {
return nil, err
}
err = <-errCh
if err != nil {
return nil, err
}
return s, nil
}
func (b Builder) try(fn func(s *Search) (*Search, error), s *Search, errCh chan error) (*Search, error) {
defer func(errCh chan error) {
if err := recover(); err != nil {
if rErr, ok := err.(error); ok {
errCh <- rErr
} else {
errCh <- fmt.Errorf("%s", err)
}
close(errCh)
} else {
close(errCh)
}
}(errCh)
s, err := fn(s)
if err != nil {
errCh <- err
}
return s, err
}