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// Copyright (c) 2020 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package binapigen
import (
"path"
"strconv"
)
func init() {
RegisterPlugin("http", GenerateHTTP)
}
// library dependencies
const (
httpPkg = GoImportPath("net/http")
ioutilPkg = GoImportPath("io/ioutil")
jsonPkg = GoImportPath("encoding/json")
)
func GenerateHTTP(gen *Generator, file *File) *GenFile {
if file.Service == nil {
return nil
}
logf("----------------------------")
logf(" Generate HTTP - %s", file.Desc.Name)
logf("----------------------------")
filename := path.Join(file.FilenamePrefix, file.Desc.Name+"_http.ba.go")
g := gen.NewGenFile(filename, file.GoImportPath)
g.file = file
// generate file header
g.P("// Code generated by GoVPP's binapi-generator. DO NOT EDIT.")
g.P()
g.P("package ", file.PackageName)
g.P()
// generate RPC service
if len(file.Service.RPCs) > 0 {
genHTTPHandler(g, file.Service)
}
return g
}
func genHTTPHandler(g *GenFile, svc *Service) {
// generate handler constructor
g.P("func HTTPHandler(rpc ", serviceApiName, ") ", httpPkg.Ident("Handler"), " {")
g.P(" mux := ", httpPkg.Ident("NewServeMux"), "()")
// generate http handlers for rpc
for _, rpc := range svc.RPCs {
if rpc.MsgReply == nil {
continue
}
if rpc.VPP.Stream {
continue // TODO: implement handler for streaming messages
}
g.P("mux.HandleFunc(", strconv.Quote("/"+rpc.VPP.Request), ", func(w ", httpPkg.Ident("ResponseWriter"), ", req *", httpPkg.Ident("Request"), ") {")
g.P("var request = new(", rpc.MsgRequest.GoName, ")")
if len(rpc.MsgRequest.Fields) > 0 {
g.P("b, err := ", ioutilPkg.Ident("ReadAll"), "(req.Body)")
g.P("if err != nil {")
g.P(" ", httpPkg.Ident("Error"), "(w, \"read body failed\", ", httpPkg.Ident("StatusBadRequest"), ")")
g.P(" return")
g.P("}")
g.P("if err := ", jsonPkg.Ident("Unmarshal"), "(b, request); err != nil {")
g.P(" ", httpPkg.Ident("Error"), "(w, \"unmarshal data failed\", ", httpPkg.Ident("StatusBadRequest"), ")")
g.P(" return")
g.P("}")
}
g.P("reply, err := rpc.", rpc.GoName, "(req.Context(), request)")
g.P("if err != nil {")
g.P(" ", httpPkg.Ident("Error"), "(w, \"request failed: \"+err.Error(), ", httpPkg.Ident("StatusInternalServerError"), ")")
g.P(" return")
g.P("}")
g.P("rep, err := ", jsonPkg.Ident("MarshalIndent"), "(reply, \"\", \" \")")
g.P("if err != nil {")
g.P(" ", httpPkg.Ident("Error"), "(w, \"marshal failed: \"+err.Error(), ", httpPkg.Ident("StatusInternalServerError"), ")")
g.P(" return")
g.P("}")
g.P("w.Write(rep)")
g.P("})")
}
g.P("return ", httpPkg.Ident("HandlerFunc"), "(mux.ServeHTTP)")
g.P("}")
g.P()
}
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