/
template.go
147 lines (127 loc) · 3 KB
/
template.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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
package server
import (
"bytes"
"html/template"
)
var serviceTemplate = `
{{- /* delete empty line */ -}}
package service
import (
{{- if .UseContext }}
"context"
{{- end }}
{{- if .UseIO }}
"io"
{{- end }}
"github.com/google/wire"
pb "{{ .Package }}"
{{- if .GoogleEmpty }}
"google.golang.org/protobuf/types/known/emptypb"
{{- end }}
)
var (
_ pb.{{ .Service }}Server = (*{{ .Service }}Server)(nil)
)
type {{ .Service }}Server struct {
pb.Unimplemented{{ .Service }}Server
}
func New{{ .Service }}Server() *{{ .Service }}Server {
return &{{ .Service }}Server{}
}
{{- $s1 := "google.protobuf.Empty" }}
{{ range .Methods }}
{{- if eq .Type 1 }}
func (s *{{ .Service }}Server) {{ .Name }}(ctx context.Context, req {{ if eq .Request $s1 }}*emptypb.Empty
{{ else }}*pb.{{ .Request }}{{ end }}) ({{ if eq .Reply $s1 }}*emptypb.Empty{{ else }}*pb.{{ .Reply }}{{ end }}, error) {
return {{ if eq .Reply $s1 }}&emptypb.Empty{}{{ else }}&pb.{{ .Reply }}{}{{ end }}, nil
}
{{- else if eq .Type 2 }}
func (s *{{ .Service }}Server) {{ .Name }}(conn pb.{{ .Service }}_{{ .Name }}Server) error {
for {
req, err := conn.Recv()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
err = conn.Send(&pb.{{ .Reply }}{})
if err != nil {
return err
}
}
}
{{- else if eq .Type 3 }}
func (s *{{ .Service }}Server) {{ .Name }}(conn pb.{{ .Service }}_{{ .Name }}Server) error {
for {
req, err := conn.Recv()
if err == io.EOF {
return conn.SendAndClose(&pb.{{ .Reply }}{})
}
if err != nil {
return err
}
}
}
{{- else if eq .Type 4 }}
func (s *{{ .Service }}Server) {{ .Name }}(req {{ if eq .Request $s1 }}*emptypb.Empty
{{ else }}*pb.{{ .Request }}{{ end }}, conn pb.{{ .Service }}_{{ .Name }}Server) error {
for {
err := conn.Send(&pb.{{ .Reply }}{})
if err != nil {
return err
}
}
}
{{- end }}
{{- end }}
`
type MethodType uint8
const (
unaryType MethodType = 1
twoWayStreamsType MethodType = 2
requestStreamsType MethodType = 3
returnsStreamsType MethodType = 4
)
// Service is a proto service.
type Service struct {
Package string
Service string
Methods []*Method
GoogleEmpty bool
UseIO bool
UseContext bool
}
// Method is a proto method.
type Method struct {
Service string
Name string
Request string
Reply string
// type: unary or stream
Type MethodType
}
func (s *Service) execute() ([]byte, error) {
const empty = "google.protobuf.Empty"
buf := new(bytes.Buffer)
for _, method := range s.Methods {
if (method.Type == unaryType && (method.Request == empty || method.Reply == empty)) ||
(method.Type == returnsStreamsType && method.Request == empty) {
s.GoogleEmpty = true
}
if method.Type == twoWayStreamsType || method.Type == requestStreamsType {
s.UseIO = true
}
if method.Type == unaryType {
s.UseContext = true
}
}
tmpl, err := template.New("server").Parse(serviceTemplate)
if err != nil {
return nil, err
}
if err := tmpl.Execute(buf, s); err != nil {
return nil, err
}
return buf.Bytes(), nil
}