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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 (
"fmt"
"io"
"strings"
)
// generated service names
const (
serviceApiName = "RPCService" // name for the RPC service interface
serviceImplName = "serviceClient" // name for the RPC service implementation
serviceClientName = "ServiceClient" // name for the RPC service client
// TODO: register service descriptor
//serviceDescType = "ServiceDesc" // name for service descriptor type
//serviceDescName = "_ServiceRPC_serviceDesc" // name for service descriptor var
)
func generateFileRPC(ctx *GenFile, w io.Writer) {
logf("----------------------------")
logf("generating RPC file package: %q", ctx.file.PackageName)
logf("----------------------------")
// generate file header
fmt.Fprintln(w, "// Code generated by GoVPP's binapi-generator. DO NOT EDIT.")
fmt.Fprintln(w)
// generate package header
fmt.Fprintf(w, "package %s\n", ctx.file.PackageName)
fmt.Fprintln(w)
// generate imports
fmt.Fprintln(w, "import (")
fmt.Fprintln(w, ` "context"`)
fmt.Fprintln(w, ` "io"`)
fmt.Fprintln(w)
fmt.Fprintf(w, "\tapi \"%s\"\n", "git.fd.io/govpp.git/api")
fmt.Fprintln(w, ")")
fmt.Fprintln(w)
// generate RPC service
if ctx.file.Service != nil && len(ctx.file.Service.RPCs) > 0 {
generateService(ctx, w, ctx.file.Service)
}
// generate message registrations
/*fmt.Fprintln(w, "var _RPCService_desc = api.RPCDesc{")
fmt.Fprintln(w, "}")
fmt.Fprintln(w)*/
// generate import refs
fmt.Fprintf(w, "// Reference imports to suppress errors if they are not otherwise used.\n")
fmt.Fprintf(w, "var _ = api.RegisterMessage\n")
fmt.Fprintf(w, "var _ = context.Background\n")
fmt.Fprintf(w, "var _ = io.Copy\n")
}
func generateService(ctx *GenFile, w io.Writer, svc *Service) {
// generate services comment
generateComment(ctx, w, serviceApiName, "services", "service")
// generate service api
fmt.Fprintf(w, "type %s interface {\n", serviceApiName)
for _, rpc := range svc.RPCs {
generateRPCMethod(ctx, w, &rpc)
fmt.Fprintln(w)
}
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
// generate client implementation
fmt.Fprintf(w, "type %s struct {\n", serviceImplName)
fmt.Fprintf(w, "\tch api.Channel\n")
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
// generate client constructor
fmt.Fprintf(w, "func New%s(ch api.Channel) %s {\n", serviceClientName, serviceApiName)
fmt.Fprintf(w, "\treturn &%s{ch}\n", serviceImplName)
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
for _, rpc := range svc.RPCs {
method := camelCaseName(rpc.RequestMsg)
if m := strings.TrimSuffix(method, "Dump"); method != m {
method = "Dump" + m
}
fmt.Fprintf(w, "func (c *%s) ", serviceImplName)
generateRPCMethod(ctx, w, &rpc)
fmt.Fprintln(w, " {")
if rpc.Stream {
streamImpl := fmt.Sprintf("%s_%sClient", serviceImplName, method)
fmt.Fprintf(w, "\tstream := c.ch.SendMultiRequest(in)\n")
fmt.Fprintf(w, "\tx := &%s{stream}\n", streamImpl)
fmt.Fprintf(w, "\treturn x, nil\n")
} else if replyTyp := camelCaseName(rpc.ReplyMsg); replyTyp != "" {
fmt.Fprintf(w, "\tout := new(%s)\n", replyTyp)
fmt.Fprintf(w, "\terr:= c.ch.SendRequest(in).ReceiveReply(out)\n")
fmt.Fprintf(w, "\tif err != nil { return nil, err }\n")
fmt.Fprintf(w, "\treturn out, nil\n")
} else {
fmt.Fprintf(w, "\tc.ch.SendRequest(in)\n")
fmt.Fprintf(w, "\treturn nil\n")
}
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
if rpc.Stream {
replyTyp := camelCaseName(rpc.ReplyMsg)
method := camelCaseName(rpc.RequestMsg)
if m := strings.TrimSuffix(method, "Dump"); method != m {
method = "Dump" + m
}
streamApi := fmt.Sprintf("%s_%sClient", serviceApiName, method)
fmt.Fprintf(w, "type %s interface {\n", streamApi)
fmt.Fprintf(w, "\tRecv() (*%s, error)\n", replyTyp)
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
streamImpl := fmt.Sprintf("%s_%sClient", serviceImplName, method)
fmt.Fprintf(w, "type %s struct {\n", streamImpl)
fmt.Fprintf(w, "\tapi.MultiRequestCtx\n")
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
fmt.Fprintf(w, "func (c *%s) Recv() (*%s, error) {\n", streamImpl, replyTyp)
fmt.Fprintf(w, "\tm := new(%s)\n", replyTyp)
fmt.Fprintf(w, "\tstop, err := c.MultiRequestCtx.ReceiveReply(m)\n")
fmt.Fprintf(w, "\tif err != nil { return nil, err }\n")
fmt.Fprintf(w, "\tif stop { return nil, io.EOF }\n")
fmt.Fprintf(w, "\treturn m, nil\n")
fmt.Fprintln(w, "}")
fmt.Fprintln(w)
}
}
// TODO: generate service descriptor
/*fmt.Fprintf(w, "var %s = api.%s{\n", serviceDescName, serviceDescType)
fmt.Fprintf(w, "\tServiceName: \"%s\",\n", ctx.moduleName)
fmt.Fprintf(w, "\tHandlerType: (*%s)(nil),\n", serviceApiName)
fmt.Fprintf(w, "\tMethods: []api.MethodDesc{\n")
for _, method := range rpcs {
fmt.Fprintf(w, "\t {\n")
fmt.Fprintf(w, "\t MethodName: \"%s\",\n", method.Name)
fmt.Fprintf(w, "\t },\n")
}
fmt.Fprintf(w, "\t},\n")
//fmt.Fprintf(w, "\tCompatibility: %s,\n", messageCrcName)
//fmt.Fprintf(w, "\tMetadata: reflect.TypeOf((*%s)(nil)).Elem().PkgPath(),\n", serviceApiName)
fmt.Fprintf(w, "\tMetadata: \"%s\",\n", ctx.inputFile)
fmt.Fprintln(w, "}")*/
fmt.Fprintln(w)
}
func generateRPCMethod(ctx *GenFile, w io.Writer, rpc *RPC) {
reqTyp := camelCaseName(rpc.RequestMsg)
logf(" writing RPC: %+v", reqTyp)
// method name is same as parameter type name by default
method := reqTyp
if rpc.Stream {
// use Dump as prefix instead of suffix for stream services
if m := strings.TrimSuffix(method, "Dump"); method != m {
method = "Dump" + m
}
}
params := fmt.Sprintf("in *%s", reqTyp)
returns := "error"
if replyType := camelCaseName(rpc.ReplyMsg); replyType != "" {
var replyTyp string
if rpc.Stream {
replyTyp = fmt.Sprintf("%s_%sClient", serviceApiName, method)
} else {
replyTyp = fmt.Sprintf("*%s", replyType)
}
returns = fmt.Sprintf("(%s, error)", replyTyp)
}
fmt.Fprintf(w, "\t%s(ctx context.Context, %s) %s", method, params, returns)
}
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