mirror of https://github.com/tidwall/tile38.git
464 lines
15 KiB
Go
464 lines
15 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
|
|
//
|
|
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// https://github.com/golang/protobuf
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived from
|
|
// this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// Package grpc outputs gRPC service descriptions in Go code.
|
|
// It runs as a plugin for the Go protocol buffer compiler plugin.
|
|
// It is linked in to protoc-gen-go.
|
|
package grpc
|
|
|
|
import (
|
|
"fmt"
|
|
"path"
|
|
"strconv"
|
|
"strings"
|
|
|
|
pb "github.com/golang/protobuf/protoc-gen-go/descriptor"
|
|
"github.com/golang/protobuf/protoc-gen-go/generator"
|
|
)
|
|
|
|
// generatedCodeVersion indicates a version of the generated code.
|
|
// It is incremented whenever an incompatibility between the generated code and
|
|
// the grpc package is introduced; the generated code references
|
|
// a constant, grpc.SupportPackageIsVersionN (where N is generatedCodeVersion).
|
|
const generatedCodeVersion = 4
|
|
|
|
// Paths for packages used by code generated in this file,
|
|
// relative to the import_prefix of the generator.Generator.
|
|
const (
|
|
contextPkgPath = "golang.org/x/net/context"
|
|
grpcPkgPath = "google.golang.org/grpc"
|
|
)
|
|
|
|
func init() {
|
|
generator.RegisterPlugin(new(grpc))
|
|
}
|
|
|
|
// grpc is an implementation of the Go protocol buffer compiler's
|
|
// plugin architecture. It generates bindings for gRPC support.
|
|
type grpc struct {
|
|
gen *generator.Generator
|
|
}
|
|
|
|
// Name returns the name of this plugin, "grpc".
|
|
func (g *grpc) Name() string {
|
|
return "grpc"
|
|
}
|
|
|
|
// The names for packages imported in the generated code.
|
|
// They may vary from the final path component of the import path
|
|
// if the name is used by other packages.
|
|
var (
|
|
contextPkg string
|
|
grpcPkg string
|
|
)
|
|
|
|
// Init initializes the plugin.
|
|
func (g *grpc) Init(gen *generator.Generator) {
|
|
g.gen = gen
|
|
contextPkg = generator.RegisterUniquePackageName("context", nil)
|
|
grpcPkg = generator.RegisterUniquePackageName("grpc", nil)
|
|
}
|
|
|
|
// Given a type name defined in a .proto, return its object.
|
|
// Also record that we're using it, to guarantee the associated import.
|
|
func (g *grpc) objectNamed(name string) generator.Object {
|
|
g.gen.RecordTypeUse(name)
|
|
return g.gen.ObjectNamed(name)
|
|
}
|
|
|
|
// Given a type name defined in a .proto, return its name as we will print it.
|
|
func (g *grpc) typeName(str string) string {
|
|
return g.gen.TypeName(g.objectNamed(str))
|
|
}
|
|
|
|
// P forwards to g.gen.P.
|
|
func (g *grpc) P(args ...interface{}) { g.gen.P(args...) }
|
|
|
|
// Generate generates code for the services in the given file.
|
|
func (g *grpc) Generate(file *generator.FileDescriptor) {
|
|
if len(file.FileDescriptorProto.Service) == 0 {
|
|
return
|
|
}
|
|
|
|
g.P("// Reference imports to suppress errors if they are not otherwise used.")
|
|
g.P("var _ ", contextPkg, ".Context")
|
|
g.P("var _ ", grpcPkg, ".ClientConn")
|
|
g.P()
|
|
|
|
// Assert version compatibility.
|
|
g.P("// This is a compile-time assertion to ensure that this generated file")
|
|
g.P("// is compatible with the grpc package it is being compiled against.")
|
|
g.P("const _ = ", grpcPkg, ".SupportPackageIsVersion", generatedCodeVersion)
|
|
g.P()
|
|
|
|
for i, service := range file.FileDescriptorProto.Service {
|
|
g.generateService(file, service, i)
|
|
}
|
|
}
|
|
|
|
// GenerateImports generates the import declaration for this file.
|
|
func (g *grpc) GenerateImports(file *generator.FileDescriptor) {
|
|
if len(file.FileDescriptorProto.Service) == 0 {
|
|
return
|
|
}
|
|
g.P("import (")
|
|
g.P(contextPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, contextPkgPath)))
|
|
g.P(grpcPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, grpcPkgPath)))
|
|
g.P(")")
|
|
g.P()
|
|
}
|
|
|
|
// reservedClientName records whether a client name is reserved on the client side.
|
|
var reservedClientName = map[string]bool{
|
|
// TODO: do we need any in gRPC?
|
|
}
|
|
|
|
func unexport(s string) string { return strings.ToLower(s[:1]) + s[1:] }
|
|
|
|
// generateService generates all the code for the named service.
|
|
func (g *grpc) generateService(file *generator.FileDescriptor, service *pb.ServiceDescriptorProto, index int) {
|
|
path := fmt.Sprintf("6,%d", index) // 6 means service.
|
|
|
|
origServName := service.GetName()
|
|
fullServName := origServName
|
|
if pkg := file.GetPackage(); pkg != "" {
|
|
fullServName = pkg + "." + fullServName
|
|
}
|
|
servName := generator.CamelCase(origServName)
|
|
|
|
g.P()
|
|
g.P("// Client API for ", servName, " service")
|
|
g.P()
|
|
|
|
// Client interface.
|
|
g.P("type ", servName, "Client interface {")
|
|
for i, method := range service.Method {
|
|
g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service.
|
|
g.P(g.generateClientSignature(servName, method))
|
|
}
|
|
g.P("}")
|
|
g.P()
|
|
|
|
// Client structure.
|
|
g.P("type ", unexport(servName), "Client struct {")
|
|
g.P("cc *", grpcPkg, ".ClientConn")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
// NewClient factory.
|
|
g.P("func New", servName, "Client (cc *", grpcPkg, ".ClientConn) ", servName, "Client {")
|
|
g.P("return &", unexport(servName), "Client{cc}")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
var methodIndex, streamIndex int
|
|
serviceDescVar := "_" + servName + "_serviceDesc"
|
|
// Client method implementations.
|
|
for _, method := range service.Method {
|
|
var descExpr string
|
|
if !method.GetServerStreaming() && !method.GetClientStreaming() {
|
|
// Unary RPC method
|
|
descExpr = fmt.Sprintf("&%s.Methods[%d]", serviceDescVar, methodIndex)
|
|
methodIndex++
|
|
} else {
|
|
// Streaming RPC method
|
|
descExpr = fmt.Sprintf("&%s.Streams[%d]", serviceDescVar, streamIndex)
|
|
streamIndex++
|
|
}
|
|
g.generateClientMethod(servName, fullServName, serviceDescVar, method, descExpr)
|
|
}
|
|
|
|
g.P("// Server API for ", servName, " service")
|
|
g.P()
|
|
|
|
// Server interface.
|
|
serverType := servName + "Server"
|
|
g.P("type ", serverType, " interface {")
|
|
for i, method := range service.Method {
|
|
g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service.
|
|
g.P(g.generateServerSignature(servName, method))
|
|
}
|
|
g.P("}")
|
|
g.P()
|
|
|
|
// Server registration.
|
|
g.P("func Register", servName, "Server(s *", grpcPkg, ".Server, srv ", serverType, ") {")
|
|
g.P("s.RegisterService(&", serviceDescVar, `, srv)`)
|
|
g.P("}")
|
|
g.P()
|
|
|
|
// Server handler implementations.
|
|
var handlerNames []string
|
|
for _, method := range service.Method {
|
|
hname := g.generateServerMethod(servName, fullServName, method)
|
|
handlerNames = append(handlerNames, hname)
|
|
}
|
|
|
|
// Service descriptor.
|
|
g.P("var ", serviceDescVar, " = ", grpcPkg, ".ServiceDesc {")
|
|
g.P("ServiceName: ", strconv.Quote(fullServName), ",")
|
|
g.P("HandlerType: (*", serverType, ")(nil),")
|
|
g.P("Methods: []", grpcPkg, ".MethodDesc{")
|
|
for i, method := range service.Method {
|
|
if method.GetServerStreaming() || method.GetClientStreaming() {
|
|
continue
|
|
}
|
|
g.P("{")
|
|
g.P("MethodName: ", strconv.Quote(method.GetName()), ",")
|
|
g.P("Handler: ", handlerNames[i], ",")
|
|
g.P("},")
|
|
}
|
|
g.P("},")
|
|
g.P("Streams: []", grpcPkg, ".StreamDesc{")
|
|
for i, method := range service.Method {
|
|
if !method.GetServerStreaming() && !method.GetClientStreaming() {
|
|
continue
|
|
}
|
|
g.P("{")
|
|
g.P("StreamName: ", strconv.Quote(method.GetName()), ",")
|
|
g.P("Handler: ", handlerNames[i], ",")
|
|
if method.GetServerStreaming() {
|
|
g.P("ServerStreams: true,")
|
|
}
|
|
if method.GetClientStreaming() {
|
|
g.P("ClientStreams: true,")
|
|
}
|
|
g.P("},")
|
|
}
|
|
g.P("},")
|
|
g.P("Metadata: \"", file.GetName(), "\",")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
|
|
// generateClientSignature returns the client-side signature for a method.
|
|
func (g *grpc) generateClientSignature(servName string, method *pb.MethodDescriptorProto) string {
|
|
origMethName := method.GetName()
|
|
methName := generator.CamelCase(origMethName)
|
|
if reservedClientName[methName] {
|
|
methName += "_"
|
|
}
|
|
reqArg := ", in *" + g.typeName(method.GetInputType())
|
|
if method.GetClientStreaming() {
|
|
reqArg = ""
|
|
}
|
|
respName := "*" + g.typeName(method.GetOutputType())
|
|
if method.GetServerStreaming() || method.GetClientStreaming() {
|
|
respName = servName + "_" + generator.CamelCase(origMethName) + "Client"
|
|
}
|
|
return fmt.Sprintf("%s(ctx %s.Context%s, opts ...%s.CallOption) (%s, error)", methName, contextPkg, reqArg, grpcPkg, respName)
|
|
}
|
|
|
|
func (g *grpc) generateClientMethod(servName, fullServName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) {
|
|
sname := fmt.Sprintf("/%s/%s", fullServName, method.GetName())
|
|
methName := generator.CamelCase(method.GetName())
|
|
inType := g.typeName(method.GetInputType())
|
|
outType := g.typeName(method.GetOutputType())
|
|
|
|
g.P("func (c *", unexport(servName), "Client) ", g.generateClientSignature(servName, method), "{")
|
|
if !method.GetServerStreaming() && !method.GetClientStreaming() {
|
|
g.P("out := new(", outType, ")")
|
|
// TODO: Pass descExpr to Invoke.
|
|
g.P("err := ", grpcPkg, `.Invoke(ctx, "`, sname, `", in, out, c.cc, opts...)`)
|
|
g.P("if err != nil { return nil, err }")
|
|
g.P("return out, nil")
|
|
g.P("}")
|
|
g.P()
|
|
return
|
|
}
|
|
streamType := unexport(servName) + methName + "Client"
|
|
g.P("stream, err := ", grpcPkg, ".NewClientStream(ctx, ", descExpr, `, c.cc, "`, sname, `", opts...)`)
|
|
g.P("if err != nil { return nil, err }")
|
|
g.P("x := &", streamType, "{stream}")
|
|
if !method.GetClientStreaming() {
|
|
g.P("if err := x.ClientStream.SendMsg(in); err != nil { return nil, err }")
|
|
g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
|
|
}
|
|
g.P("return x, nil")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
genSend := method.GetClientStreaming()
|
|
genRecv := method.GetServerStreaming()
|
|
genCloseAndRecv := !method.GetServerStreaming()
|
|
|
|
// Stream auxiliary types and methods.
|
|
g.P("type ", servName, "_", methName, "Client interface {")
|
|
if genSend {
|
|
g.P("Send(*", inType, ") error")
|
|
}
|
|
if genRecv {
|
|
g.P("Recv() (*", outType, ", error)")
|
|
}
|
|
if genCloseAndRecv {
|
|
g.P("CloseAndRecv() (*", outType, ", error)")
|
|
}
|
|
g.P(grpcPkg, ".ClientStream")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
g.P("type ", streamType, " struct {")
|
|
g.P(grpcPkg, ".ClientStream")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
if genSend {
|
|
g.P("func (x *", streamType, ") Send(m *", inType, ") error {")
|
|
g.P("return x.ClientStream.SendMsg(m)")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
if genRecv {
|
|
g.P("func (x *", streamType, ") Recv() (*", outType, ", error) {")
|
|
g.P("m := new(", outType, ")")
|
|
g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
|
|
g.P("return m, nil")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
if genCloseAndRecv {
|
|
g.P("func (x *", streamType, ") CloseAndRecv() (*", outType, ", error) {")
|
|
g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
|
|
g.P("m := new(", outType, ")")
|
|
g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
|
|
g.P("return m, nil")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
}
|
|
|
|
// generateServerSignature returns the server-side signature for a method.
|
|
func (g *grpc) generateServerSignature(servName string, method *pb.MethodDescriptorProto) string {
|
|
origMethName := method.GetName()
|
|
methName := generator.CamelCase(origMethName)
|
|
if reservedClientName[methName] {
|
|
methName += "_"
|
|
}
|
|
|
|
var reqArgs []string
|
|
ret := "error"
|
|
if !method.GetServerStreaming() && !method.GetClientStreaming() {
|
|
reqArgs = append(reqArgs, contextPkg+".Context")
|
|
ret = "(*" + g.typeName(method.GetOutputType()) + ", error)"
|
|
}
|
|
if !method.GetClientStreaming() {
|
|
reqArgs = append(reqArgs, "*"+g.typeName(method.GetInputType()))
|
|
}
|
|
if method.GetServerStreaming() || method.GetClientStreaming() {
|
|
reqArgs = append(reqArgs, servName+"_"+generator.CamelCase(origMethName)+"Server")
|
|
}
|
|
|
|
return methName + "(" + strings.Join(reqArgs, ", ") + ") " + ret
|
|
}
|
|
|
|
func (g *grpc) generateServerMethod(servName, fullServName string, method *pb.MethodDescriptorProto) string {
|
|
methName := generator.CamelCase(method.GetName())
|
|
hname := fmt.Sprintf("_%s_%s_Handler", servName, methName)
|
|
inType := g.typeName(method.GetInputType())
|
|
outType := g.typeName(method.GetOutputType())
|
|
|
|
if !method.GetServerStreaming() && !method.GetClientStreaming() {
|
|
g.P("func ", hname, "(srv interface{}, ctx ", contextPkg, ".Context, dec func(interface{}) error, interceptor ", grpcPkg, ".UnaryServerInterceptor) (interface{}, error) {")
|
|
g.P("in := new(", inType, ")")
|
|
g.P("if err := dec(in); err != nil { return nil, err }")
|
|
g.P("if interceptor == nil { return srv.(", servName, "Server).", methName, "(ctx, in) }")
|
|
g.P("info := &", grpcPkg, ".UnaryServerInfo{")
|
|
g.P("Server: srv,")
|
|
g.P("FullMethod: ", strconv.Quote(fmt.Sprintf("/%s/%s", fullServName, methName)), ",")
|
|
g.P("}")
|
|
g.P("handler := func(ctx ", contextPkg, ".Context, req interface{}) (interface{}, error) {")
|
|
g.P("return srv.(", servName, "Server).", methName, "(ctx, req.(*", inType, "))")
|
|
g.P("}")
|
|
g.P("return interceptor(ctx, in, info, handler)")
|
|
g.P("}")
|
|
g.P()
|
|
return hname
|
|
}
|
|
streamType := unexport(servName) + methName + "Server"
|
|
g.P("func ", hname, "(srv interface{}, stream ", grpcPkg, ".ServerStream) error {")
|
|
if !method.GetClientStreaming() {
|
|
g.P("m := new(", inType, ")")
|
|
g.P("if err := stream.RecvMsg(m); err != nil { return err }")
|
|
g.P("return srv.(", servName, "Server).", methName, "(m, &", streamType, "{stream})")
|
|
} else {
|
|
g.P("return srv.(", servName, "Server).", methName, "(&", streamType, "{stream})")
|
|
}
|
|
g.P("}")
|
|
g.P()
|
|
|
|
genSend := method.GetServerStreaming()
|
|
genSendAndClose := !method.GetServerStreaming()
|
|
genRecv := method.GetClientStreaming()
|
|
|
|
// Stream auxiliary types and methods.
|
|
g.P("type ", servName, "_", methName, "Server interface {")
|
|
if genSend {
|
|
g.P("Send(*", outType, ") error")
|
|
}
|
|
if genSendAndClose {
|
|
g.P("SendAndClose(*", outType, ") error")
|
|
}
|
|
if genRecv {
|
|
g.P("Recv() (*", inType, ", error)")
|
|
}
|
|
g.P(grpcPkg, ".ServerStream")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
g.P("type ", streamType, " struct {")
|
|
g.P(grpcPkg, ".ServerStream")
|
|
g.P("}")
|
|
g.P()
|
|
|
|
if genSend {
|
|
g.P("func (x *", streamType, ") Send(m *", outType, ") error {")
|
|
g.P("return x.ServerStream.SendMsg(m)")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
if genSendAndClose {
|
|
g.P("func (x *", streamType, ") SendAndClose(m *", outType, ") error {")
|
|
g.P("return x.ServerStream.SendMsg(m)")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
if genRecv {
|
|
g.P("func (x *", streamType, ") Recv() (*", inType, ", error) {")
|
|
g.P("m := new(", inType, ")")
|
|
g.P("if err := x.ServerStream.RecvMsg(m); err != nil { return nil, err }")
|
|
g.P("return m, nil")
|
|
g.P("}")
|
|
g.P()
|
|
}
|
|
|
|
return hname
|
|
}
|