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121 lines
3.0 KiB
121 lines
3.0 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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{{$svrType := .ServiceType}}
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{{$svrName := .ServiceName}}
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type {{.ServiceType}}HTTPServer 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 Register{{.ServiceType}}HTTPServer(s *http.Server, srv {{.ServiceType}}HTTPServer) {
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r := s.Route("/")
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{{- range .Methods}}
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r.{{.Method}}("{{.Path}}", _{{$svrType}}_{{.Name}}{{.Num}}_HTTP_Handler(srv))
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{{- end}}
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}
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{{range .Methods}}
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func _{{$svrType}}_{{.Name}}{{.Num}}_HTTP_Handler(srv {{$svrType}}HTTPServer) func(ctx http.Context) error {
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return func(ctx http.Context) error {
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var in {{.Request}}
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if err := ctx.Bind(&in{{.Body}}); err != nil {
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return err
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}
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{{- if ne (len .Vars) 0}}
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if err := ctx.BindVars(&in); err != nil {
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return err
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}
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{{- end}}
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http.SetOperation(ctx,"/{{$svrName}}/{{.Name}}")
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h := ctx.Middleware(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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out, err := h(ctx, &in)
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if err != nil {
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return err
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}
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reply := out.(*{{.Reply}})
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return ctx.Result(200, reply{{.ResponseBody}})
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}
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}
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{{end}}
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type {{.ServiceType}}HTTPClient interface {
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{{- range .MethodSets}}
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{{.Name}}(ctx context.Context, req *{{.Request}}, opts ...http.CallOption) (rsp *{{.Reply}}, err error)
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{{- end}}
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}
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type {{.ServiceType}}HTTPClientImpl struct{
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cc *http.Client
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}
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func New{{.ServiceType}}HTTPClient (client *http.Client) {{.ServiceType}}HTTPClient {
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return &{{.ServiceType}}HTTPClientImpl{client}
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}
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{{range .MethodSets}}
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func (c *{{$svrType}}HTTPClientImpl) {{.Name}}(ctx context.Context, in *{{.Request}}, opts ...http.CallOption) (*{{.Reply}}, error) {
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var out {{.Reply}}
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path := binding.EncodeURL("{{.Path}}", in, {{.IsQuery}})
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opts = append(opts, http.Operation("/{{$svrName}}/{{.Name}}"))
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{{if .HasBody -}}
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err := c.cc.Invoke(ctx, "{{.Method}}", path, in{{.Body}}, &out{{.ResponseBody}}, opts...)
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{{else -}}
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err := c.cc.Invoke(ctx, "{{.Method}}", path, nil, &out{{.ResponseBody}}, opts...)
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{{end -}}
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if err != nil {
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return nil, err
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}
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return &out, err
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}
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{{end}}
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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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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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HasBody bool
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Body string
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ResponseBody string
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IsQuery bool
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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 strings.Trim(string(buf.Bytes()), "\r\n")
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}
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