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93 lines
2.0 KiB
93 lines
2.0 KiB
package main
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import (
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"bytes"
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"strings"
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"text/template"
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)
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var httpTemplate = `
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type {{.ServiceType}}Handler interface {
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{{range .MethodSets}}
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{{.Name}}(context.Context, *{{.Request}}) (*{{.Reply}}, error)
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{{end}}
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}
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func New{{.ServiceType}}Handler(srv {{.ServiceType}}Handler, opts ...http1.HandleOption) http.Handler {
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h := http1.DefaultHandleOptions()
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for _, o := range opts {
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o(&h)
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}
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r := mux.NewRouter()
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{{range .Methods}}
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r.HandleFunc("{{.Path}}", func(w http.ResponseWriter, r *http.Request) {
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var in {{.Request}}
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if err := h.Decode(r, &in{{.Body}}); err != nil {
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h.Error(w, r, err)
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return
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}
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{{if ne (len .Vars) 0}}
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if err := binding.MapProto(&in, mux.Vars(r)); err != nil {
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h.Error(w, r, err)
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return
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}
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{{end}}
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next := func(ctx context.Context, req interface{}) (interface{}, error) {
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return srv.{{.Name}}(ctx, req.(*{{.Request}}))
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}
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if h.Middleware != nil {
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next = h.Middleware(next)
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}
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out, err := next(r.Context(), &in)
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if err != nil {
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h.Error(w, r, err)
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return
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}
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reply := out.(*{{.Reply}})
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if err := h.Encode(w, r, reply{{.ResponseBody}}); err != nil {
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h.Error(w, r, err)
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}
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}).Methods("{{.Method}}")
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{{end}}
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return r
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}
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`
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type serviceDesc struct {
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ServiceType string // Greeter
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ServiceName string // helloworld.Greeter
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Metadata string // api/helloworld/helloworld.proto
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Methods []*methodDesc
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MethodSets map[string]*methodDesc
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}
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type methodDesc struct {
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// method
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Name string
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Num int
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Vars []string
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Forms []string
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Request string
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Reply string
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// http_rule
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Path string
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Method string
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Body string
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ResponseBody string
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}
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func (s *serviceDesc) execute() string {
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s.MethodSets = make(map[string]*methodDesc)
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for _, m := range s.Methods {
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s.MethodSets[m.Name] = m
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}
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buf := new(bytes.Buffer)
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tmpl, err := template.New("http").Parse(strings.TrimSpace(httpTemplate))
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if err != nil {
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panic(err)
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}
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if err := tmpl.Execute(buf, s); err != nil {
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panic(err)
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}
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return string(buf.Bytes())
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}
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