/
generate.go
114 lines (103 loc) · 2.18 KB
/
generate.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
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
113
114
package protobuf
import (
"bytes"
"go/types"
"strings"
"github.com/hori-ryota/go-codegen/util/typeutil"
"golang.org/x/tools/go/loader"
xtypeutil "golang.org/x/tools/go/types/typeutil"
)
type Service struct {
Name string
RPCs []RPC
}
type RPC struct {
MethodName string
InputType *types.Named
OutputType *types.Named
}
func Generate(
pkgInfo *loader.PackageInfo,
protoPackage string,
goPackage string,
javaPackage string,
javaOuterClassName string,
) (string, error) {
services := make([]Service, 0, 100)
for _, name := range pkgInfo.Pkg.Scope().Names() {
if !strings.HasSuffix(name, "Usecase") {
continue
}
obj := pkgInfo.Pkg.Scope().Lookup(name)
named, ok := obj.Type().(*types.Named)
if !ok {
continue
}
methods := xtypeutil.IntuitiveMethodSet(named, nil)
rpcs := make([]RPC, 0, len(methods))
for _, method := range methods {
rpc := ParseRPC(method.Obj().(*types.Func))
if rpc == nil {
continue
}
rpcs = append(rpcs, *rpc)
}
if len(rpcs) > 0 {
services = append(services, Service{
Name: name,
RPCs: rpcs,
})
}
}
if len(services) == 0 {
return "", nil
}
out := new(bytes.Buffer)
err := Template.Execute(out, TemplateParam{
Package: protoPackage,
GoPackage: goPackage,
JavaPackage: javaPackage,
JavaOuterClassName: javaOuterClassName,
Services: services,
})
if err != nil {
return "", err
}
return out.String(), nil
}
func ParseRPC(method *types.Func) *RPC {
if !method.Exported() {
return nil
}
params := typeutil.FuncToParams(method)
if len(params) < 2 {
return nil
}
inputType := params[1]
namedInputType, ok := inputType.Type().(*types.Named)
if !ok {
return nil
}
if _, ok := namedInputType.Underlying().(*types.Struct); !ok {
return nil
}
rpc := &RPC{
MethodName: method.Name(),
InputType: namedInputType,
}
results := typeutil.FuncToResults(method)
if len(results) < 2 {
// without output
return rpc
}
outputType := results[0]
namedOutputType, ok := outputType.Type().(*types.Named)
if !ok {
return nil
}
if _, ok := namedOutputType.Underlying().(*types.Struct); !ok {
return nil
}
rpc.OutputType = namedOutputType
return rpc
}