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transport_grpc_server.go
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transport_grpc_server.go
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package template
import (
"context"
. "github.com/dave/jennifer/jen"
mstrings "github.com/devimteam/microgen/generator/strings"
"github.com/devimteam/microgen/generator/write_strategy"
"github.com/vetcher/go-astra/types"
)
type gRPCServerTemplate struct {
info *GenerationInfo
}
func NewGRPCServerTemplate(info *GenerationInfo) Template {
return &gRPCServerTemplate{
info: info,
}
}
func serverStructName(iface *types.Interface) string {
return iface.Name + "Server"
}
func privateServerStructName(iface *types.Interface) string {
return mstrings.ToLower(iface.Name) + "Server"
}
// Render whole grpc server file.
//
// // This file was automatically generated by "microgen" utility.
// // DO NOT EDIT.
// package transportgrpc
//
// import (
// svc "github.com/devimteam/microgen/examples/svc"
// protobuf "github.com/devimteam/microgen/examples/svc/transport/converter/protobuf"
// grpc "github.com/go-kit/kit/transport/grpc"
// stringsvc "gitlab.devim.team/protobuf/stringsvc"
// context "golang.org/x/net/context"
// )
//
// type stringServiceServer struct {
// count grpc.Handler
// }
//
// func NewGRPCServer(endpoints *svc.Endpoints, opts ...grpc.ServerOption) stringsvc.StringServiceServer {
// return &stringServiceServer{count: grpc.NewServer(
// endpoints.CountEndpoint,
// protobuf.DecodeCountRequest,
// protobuf.EncodeCountResponse,
// opts...,
// )}
// }
//
// func (s *stringServiceServer) Count(ctx context.Context, req *stringsvc.CountRequest) (*stringsvc.CountResponse, error) {
// _, resp, err := s.count.ServeGRPC(ctx, req)
// if err != nil {
// return nil, err
// }
// return resp.(*stringsvc.CountResponse), nil
// }
//
func (t *gRPCServerTemplate) Render(ctx context.Context) write_strategy.Renderer {
f := NewFile("transportgrpc")
f.ImportAlias(t.info.ProtobufPackageImport, "pb")
f.ImportAlias(t.info.SourcePackageImport, serviceAlias)
f.HeaderComment(t.info.FileHeader)
f.PackageComment(`DO NOT EDIT.`)
f.Type().Id(privateServerStructName(t.info.Iface)).StructFunc(func(g *Group) {
for _, method := range t.info.Iface.Methods {
if !t.info.AllowedMethods[method.Name] {
continue
}
g.Id(mstrings.ToLowerFirst(method.Name)).Qual(PackagePathGoKitTransportGRPC, "Handler")
}
}).Line()
f.Func().Id("NewGRPCServer").
ParamsFunc(func(p *Group) {
p.Id("endpoints").Op("*").Qual(t.info.OutputPackageImport+"/transport", EndpointsSetName)
if Tags(ctx).Has(TracingMiddlewareTag) {
p.Id("logger").Qual(PackagePathGoKitLog, "Logger")
}
if Tags(ctx).Has(TracingMiddlewareTag) {
p.Id("tracer").Qual(PackagePathOpenTracingGo, "Tracer")
}
p.Id("opts").Op("...").Qual(PackagePathGoKitTransportGRPC, "ServerOption")
}).Params(
Qual(t.info.ProtobufPackageImport, serverStructName(t.info.Iface)),
).
Block(
Return().Op("&").Id(privateServerStructName(t.info.Iface)).Values(DictFunc(func(g Dict) {
for _, m := range t.info.Iface.Methods {
if !t.info.AllowedMethods[m.Name] {
continue
}
g[(&Statement{}).Id(mstrings.ToLowerFirst(m.Name))] = Qual(PackagePathGoKitTransportGRPC, "NewServer").
Call(
Line().Id("endpoints").Dot(endpointsStructFieldName(m.Name)),
Line().Id(decodeRequestName(m)),
Line().Id(encodeResponseName(m)),
Line().Add(t.serverOpts(ctx, m)).Op("...").Line(),
)
}
}),
),
)
f.Line()
for _, signature := range t.info.Iface.Methods {
if !t.info.AllowedMethods[signature.Name] {
continue
}
f.Add(t.grpcServerFunc(signature, t.info.Iface)).Line()
}
return f
}
func (gRPCServerTemplate) DefaultPath() string {
return filenameBuilder(PathTransport, "grpc", "server")
}
func (t *gRPCServerTemplate) Prepare(ctx context.Context) error {
if t.info.ProtobufPackageImport == "" {
return ErrProtobufEmpty
}
return nil
}
func (t *gRPCServerTemplate) ChooseStrategy(ctx context.Context) (write_strategy.Strategy, error) {
return write_strategy.NewCreateFileStrategy(t.info.OutputFilePath, t.DefaultPath()), nil
}
// Render service interface method for grpc server.
//
// func (s *stringServiceServer) Count(ctx context.Context, req *stringsvc.CountRequest) (*stringsvc.CountResponse, error) {
// _, resp, err := s.count.ServeGRPC(ctx, req)
// if err != nil {
// return nil, err
// }
// return resp.(*stringsvc.CountResponse), nil
// }
//
func (t *gRPCServerTemplate) grpcServerFunc(signature *types.Function, i *types.Interface) *Statement {
return Func().
Params(Id(rec(privateServerStructName(i))).Op("*").Id(privateServerStructName(i))).
Id(signature.Name).
Call(Id("ctx").Qual(PackagePathNetContext, "Context"), Id("req").Add(t.grpcServerReqStruct(signature))).
Params(t.grpcServerRespStruct(signature), Error()).
BlockFunc(t.grpcServerFuncBody(signature, i))
}
// Special case for empty request
// Render
// *empty.Empty
// or
// *stringsvc.CountRequest
func (t *gRPCServerTemplate) grpcServerReqStruct(fn *types.Function) *Statement {
args := RemoveContextIfFirst(fn.Args)
if len(args) == 0 {
return Op("*").Qual(PackagePathEmptyProtobuf, "Empty")
}
if len(args) == 1 {
sp := specialTypeConverter(args[0].Type)
if sp != nil {
return sp
}
}
return Op("*").Qual(t.info.ProtobufPackageImport, requestStructName(fn))
}
// Special case for empty response
// Render
// *empty.Empty
// or
// *stringsvc.CountResponse
func (t *gRPCServerTemplate) grpcServerRespStruct(fn *types.Function) *Statement {
results := removeErrorIfLast(fn.Results)
if len(results) == 0 {
return Op("*").Qual(PackagePathEmptyProtobuf, "Empty")
}
if len(results) == 1 {
sp := specialTypeConverter(results[0].Type)
if sp != nil {
return sp
}
}
return Op("*").Qual(t.info.ProtobufPackageImport, responseStructName(fn))
}
// Render service method body for grpc server.
//
// _, resp, err := s.count.ServeGRPC(ctx, req)
// if err != nil {
// return nil, err
// }
// return resp.(*stringsvc.CountResponse), nil
//
func (t *gRPCServerTemplate) grpcServerFuncBody(signature *types.Function, i *types.Interface) func(g *Group) {
return func(g *Group) {
g.List(Id("_"), Id("resp"), Err()).
Op(":=").
Id(rec(privateServerStructName(i))).Dot(mstrings.ToLowerFirst(signature.Name)).Dot("ServeGRPC").Call(Id("ctx"), Id("req"))
g.If(Err().Op("!=").Nil()).Block(
Return().List(Nil(), Err()),
)
g.Return().List(Id("resp").Assert(t.grpcServerRespStruct(signature)), Nil())
}
}
func (t *gRPCServerTemplate) serverOpts(ctx context.Context, fn *types.Function) *Statement {
s := &Statement{}
if Tags(ctx).Has(TracingMiddlewareTag) {
s.Op("append(")
defer s.Op(")")
}
s.Id("opts")
if Tags(ctx).Has(TracingMiddlewareTag) {
s.Op(",").Qual(PackagePathGoKitTransportGRPC, "ServerBefore").Call(
Line().Qual(PackagePathGoKitTracing, "GRPCToContext").Call(Id("tracer"), Lit(fn.Name), Id("logger")),
)
}
return s
}