-
Notifications
You must be signed in to change notification settings - Fork 226
/
response.go
197 lines (173 loc) · 5.74 KB
/
response.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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
package endpointgen
import (
. "github.com/dave/jennifer/jen"
"encr.dev/v2/codegen/apigen/apigenutil"
"encr.dev/v2/codegen/internal/genutil"
"encr.dev/v2/internals/schema"
"encr.dev/v2/internals/schema/schemautil"
"encr.dev/v2/parser/apis/api"
"encr.dev/v2/parser/apis/api/apienc"
)
// responseDesc describes the generated response type.
type responseDesc struct {
gu *genutil.Helper
ep *api.Endpoint
}
func (d *responseDesc) TypeName() string {
return "EncoreInternal_" + d.ep.Name + "Resp"
}
func (d *responseDesc) Type() *Statement {
return Id(d.TypeName())
}
func (d *responseDesc) TypeDecl() *Statement {
return Type().Id(d.TypeName()).Op("=").Do(func(s *Statement) {
if d.ep.Response != nil {
s.Add(d.gu.Type(d.ep.Response))
} else {
s.Add(apiQ("Void"))
}
})
}
func (d *responseDesc) ZeroType() *Statement {
if d.ep.Response != nil {
return d.gu.Zero(d.ep.Response)
} else {
return apiQ("Void").Values()
}
}
func (d *responseDesc) EncodeResponse() *Statement {
if d.ep.Raw {
return Nil()
}
return Func().Params(
Id("w").Qual("net/http", "ResponseWriter"),
Id("json").Qual("github.com/json-iterator/go", "API"),
Id("resp").Add(d.Type()),
).Params(Err().Error()).BlockFunc(func(g *Group) {
if d.ep.Response == nil {
g.Return(Nil())
return
}
resp := apienc.DescribeResponse(d.gu.Errs, d.ep.Response)
if len(resp.BodyParameters) > 0 {
g.Id("respData").Op(":=").Index().Byte().Parens(Lit("null\n"))
} else {
g.Id("respData").Op(":=").Index().Byte().Values(LitRune('\n'))
}
if len(resp.HeaderParameters) > 0 {
g.Var().Id("headers").Map(String()).Index().String()
}
responseEncoder := CustomFunc(Options{Separator: "\n"}, func(g *Group) {
if len(resp.BodyParameters) > 0 {
g.Comment("Encode JSON body")
g.List(Id("respData"), Err()).Op("=").Qual("encore.dev/appruntime/shared/serde", "SerializeJSONFunc").Call(
Id("json"),
Func().Params(
Id("ser").Op("*").Qual("encore.dev/appruntime/shared/serde", "JSONSerializer"),
).BlockFunc(
func(g *Group) {
for _, f := range resp.BodyParameters {
g.Add(Id("ser").Dot("WriteField").Call(Lit(f.WireName), Id("resp").Dot(f.SrcName), Lit(f.OmitEmpty)))
}
}))
g.If(Err().Op("!=").Nil()).Block(
Return(Err()),
)
g.Id("respData").Op("=").Append(Id("respData"), LitRune('\n'))
}
if len(resp.HeaderParameters) > 0 {
g.Line().Comment("Encode headers")
g.Id("headers").Op("=").Map(String()).Index().String().Values(DictFunc(func(dict Dict) {
for _, f := range resp.HeaderParameters {
if builtin, ok := f.Type.(schema.BuiltinType); ok {
encExpr := genutil.MarshalBuiltin(builtin.Kind, Id("resp").Dot(f.SrcName))
dict[Lit(f.WireName)] = Index().String().Values(encExpr)
} else {
d.gu.Errs.Addf(f.Type.ASTExpr().Pos(), "unsupported type in header: %s", d.gu.TypeToString(f.Type))
}
}
}))
}
})
// If response is a ptr we need to check it's not nil
if schemautil.IsPointer(d.ep.Response) {
g.If(Id("resp").Op("!=").Nil()).Block(responseEncoder)
} else {
g.Add(responseEncoder)
}
g.Line().Comment("Write response")
if len(resp.HeaderParameters) > 0 {
g.For(List(Id("k"), Id("vs")).Op(":=").Range().Id("headers")).Block(
For(List(Id("_"), Id("v")).Op(":=").Range().Id("vs")).Block(
Id("w").Dot("Header").Call().Dot("Add").Call(Id("k"), Id("v")),
),
)
}
g.Id("w").Dot("Write").Call(Id("respData"))
g.Return(Nil())
})
}
func (d *responseDesc) DecodeExternalResp() *Statement {
if d.ep.Raw {
// TODO(andre) support
return Nil()
}
return Func().Params(
Id("httpResp").Op("*").Qual("net/http", "Response"),
Id("json").Qual("github.com/json-iterator/go", "API"),
).Params(
Id("resp").Add(d.Type()),
Err().Error(),
).BlockFunc(func(g *Group) {
if d.ep.Response == nil {
g.Return(d.ZeroType(), Nil())
return
}
g.Id("resp").Op("=").Add(d.gu.Initialize(d.ep.Response))
enc := d.ep.ResponseEncoding()
dec := d.gu.NewTypeUnmarshaller("dec")
g.Add(dec.Init())
apigenutil.DecodeHeaders(g, Id("httpResp").Dot("Header"), Id("resp"), dec, enc.HeaderParameters)
apigenutil.DecodeBody(g, Id("httpResp").Dot("Body"), Id("resp"), dec, enc.BodyParameters)
g.If(Err().Op(":=").Add(dec.Err()), Err().Op("!=").Nil()).Block(
Return(d.ZeroType(), Err()),
)
g.Return(Id("resp"), Nil())
})
}
// httpRespExpr returns an expression to access the HTTP response writer variable.
func (d *requestDesc) httpRespExpr() *Statement {
return Id("httpResp")
}
// respDataExpr returns the expression to access the respData variable.
func (d *responseDesc) respDataExpr() *Statement {
return Id("respData")
}
// respDataPayloadExpr returns an expression for accessing the payload
// in the reqData variable.
func (d *responseDesc) respDataPayloadExpr() *Statement {
return d.respDataExpr()
}
// zero returns an expression representing the zero value
// of the response type.
func (d *responseDesc) zero() *Statement {
if d.ep.Response != nil {
return d.gu.Zero(d.ep.Response)
} else {
return apiQ("Void").Values()
}
}
// Clone returns the function literal to clone the request.
func (d *responseDesc) Clone() *Statement {
const recv = "r"
return Func().Params(Id(recv).Add(d.Type())).Params(d.Type(), Error()).BlockFunc(func(g *Group) {
// We could optimize the clone operation if there are no reference types (pointers, maps, slices)
// in the struct. For now, simply serialize it as JSON and back.
g.Var().Id("clone").Add(d.Type())
g.List(Id("bytes"), Id("err")).Op(":=").Qual(jsonIterPkg, "ConfigDefault").Dot("Marshal").Call(Id(recv))
g.If(Err().Op("==").Nil()).Block(
Err().Op("=").Qual(jsonIterPkg, "ConfigDefault").Dot("Unmarshal").Call(Id("bytes"), Op("&").Id("clone")),
)
g.Return(Id("clone"), Err())
})
}