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-rw-r--r--binapigen/gen_http.go103
1 files changed, 103 insertions, 0 deletions
diff --git a/binapigen/gen_http.go b/binapigen/gen_http.go
new file mode 100644
index 0000000..4c9697e
--- /dev/null
+++ b/binapigen/gen_http.go
@@ -0,0 +1,103 @@
+// 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()
+}