431 lines
15 KiB
Go
431 lines
15 KiB
Go
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/*
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*
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* Copyright 2020 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package main
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import (
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"fmt"
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"strconv"
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"strings"
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"google.golang.org/protobuf/compiler/protogen"
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"google.golang.org/protobuf/types/descriptorpb"
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)
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const (
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contextPackage = protogen.GoImportPath("context")
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grpcPackage = protogen.GoImportPath("google.golang.org/grpc")
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codesPackage = protogen.GoImportPath("google.golang.org/grpc/codes")
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statusPackage = protogen.GoImportPath("google.golang.org/grpc/status")
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)
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// generateFile generates a _grpc.pb.go file containing gRPC service definitions.
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func generateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile {
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if len(file.Services) == 0 {
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return nil
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}
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filename := file.GeneratedFilenamePrefix + "_grpc.pb.go"
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g := gen.NewGeneratedFile(filename, file.GoImportPath)
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g.P("// Code generated by protoc-gen-go-grpc. DO NOT EDIT.")
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g.P()
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g.P("package ", file.GoPackageName)
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g.P()
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generateFileContent(gen, file, g)
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return g
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}
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// generateFileContent generates the gRPC service definitions, excluding the package statement.
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func generateFileContent(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile) {
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if len(file.Services) == 0 {
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return
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}
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g.P("// This is a compile-time assertion to ensure that this generated file")
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g.P("// is compatible with the grpc package it is being compiled against.")
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g.P("// Requires gRPC-Go v1.32.0 or later.")
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g.P("const _ = ", grpcPackage.Ident("SupportPackageIsVersion7")) // When changing, update version number above.
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g.P()
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for _, service := range file.Services {
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genService(gen, file, g, service)
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}
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}
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func genService(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, service *protogen.Service) {
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clientName := service.GoName + "Client"
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g.P("// ", clientName, " is the client API for ", service.GoName, " service.")
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g.P("//")
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g.P("// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.")
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// Client interface.
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if service.Desc.Options().(*descriptorpb.ServiceOptions).GetDeprecated() {
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g.P("//")
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g.P(deprecationComment)
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}
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g.Annotate(clientName, service.Location)
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g.P("type ", clientName, " interface {")
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for _, method := range service.Methods {
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g.Annotate(clientName+"."+method.GoName, method.Location)
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if method.Desc.Options().(*descriptorpb.MethodOptions).GetDeprecated() {
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g.P(deprecationComment)
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}
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g.P(method.Comments.Leading,
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clientSignature(g, method))
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}
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g.P("}")
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g.P()
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// Client structure.
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g.P("type ", unexport(clientName), " struct {")
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g.P("cc ", grpcPackage.Ident("ClientConnInterface"))
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g.P("}")
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g.P()
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// NewClient factory.
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if service.Desc.Options().(*descriptorpb.ServiceOptions).GetDeprecated() {
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g.P(deprecationComment)
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}
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g.P("func New", clientName, " (cc ", grpcPackage.Ident("ClientConnInterface"), ") ", clientName, " {")
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g.P("return &", unexport(clientName), "{cc}")
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g.P("}")
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g.P()
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var methodIndex, streamIndex int
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// Client method implementations.
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for _, method := range service.Methods {
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if !method.Desc.IsStreamingServer() && !method.Desc.IsStreamingClient() {
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// Unary RPC method
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genClientMethod(gen, file, g, method, methodIndex)
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methodIndex++
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} else {
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// Streaming RPC method
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genClientMethod(gen, file, g, method, streamIndex)
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streamIndex++
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}
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}
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mustOrShould := "must"
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if !*requireUnimplemented {
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mustOrShould = "should"
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}
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// Server interface.
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serverType := service.GoName + "Server"
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g.P("// ", serverType, " is the server API for ", service.GoName, " service.")
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g.P("// All implementations ", mustOrShould, " embed Unimplemented", serverType)
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g.P("// for forward compatibility")
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if service.Desc.Options().(*descriptorpb.ServiceOptions).GetDeprecated() {
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g.P("//")
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g.P(deprecationComment)
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}
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g.Annotate(serverType, service.Location)
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g.P("type ", serverType, " interface {")
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for _, method := range service.Methods {
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g.Annotate(serverType+"."+method.GoName, method.Location)
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if method.Desc.Options().(*descriptorpb.MethodOptions).GetDeprecated() {
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g.P(deprecationComment)
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}
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g.P(method.Comments.Leading,
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serverSignature(g, method))
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}
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if *requireUnimplemented {
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g.P("mustEmbedUnimplemented", serverType, "()")
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}
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g.P("}")
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g.P()
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// Server Unimplemented struct for forward compatibility.
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g.P("// Unimplemented", serverType, " ", mustOrShould, " be embedded to have forward compatible implementations.")
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g.P("type Unimplemented", serverType, " struct {")
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g.P("}")
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g.P()
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for _, method := range service.Methods {
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nilArg := ""
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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nilArg = "nil,"
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}
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g.P("func (Unimplemented", serverType, ") ", serverSignature(g, method), "{")
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g.P("return ", nilArg, statusPackage.Ident("Errorf"), "(", codesPackage.Ident("Unimplemented"), `, "method `, method.GoName, ` not implemented")`)
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g.P("}")
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}
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if *requireUnimplemented {
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g.P("func (Unimplemented", serverType, ") mustEmbedUnimplemented", serverType, "() {}")
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}
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g.P()
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// Unsafe Server interface to opt-out of forward compatibility.
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g.P("// Unsafe", serverType, " may be embedded to opt out of forward compatibility for this service.")
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g.P("// Use of this interface is not recommended, as added methods to ", serverType, " will")
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g.P("// result in compilation errors.")
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g.P("type Unsafe", serverType, " interface {")
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g.P("mustEmbedUnimplemented", serverType, "()")
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g.P("}")
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// Server registration.
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if service.Desc.Options().(*descriptorpb.ServiceOptions).GetDeprecated() {
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g.P(deprecationComment)
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}
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serviceDescVar := service.GoName + "_ServiceDesc"
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g.P("func Register", service.GoName, "Server(s ", grpcPackage.Ident("ServiceRegistrar"), ", srv ", serverType, ") {")
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g.P("s.RegisterService(&", serviceDescVar, `, srv)`)
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g.P("}")
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g.P()
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// Server handler implementations.
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var handlerNames []string
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for _, method := range service.Methods {
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hname := genServerMethod(gen, file, g, method)
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handlerNames = append(handlerNames, hname)
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}
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// Service descriptor.
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g.P("// ", serviceDescVar, " is the ", grpcPackage.Ident("ServiceDesc"), " for ", service.GoName, " service.")
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g.P("// It's only intended for direct use with ", grpcPackage.Ident("RegisterService"), ",")
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g.P("// and not to be introspected or modified (even as a copy)")
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g.P("var ", serviceDescVar, " = ", grpcPackage.Ident("ServiceDesc"), " {")
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g.P("ServiceName: ", strconv.Quote(string(service.Desc.FullName())), ",")
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g.P("HandlerType: (*", serverType, ")(nil),")
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g.P("Methods: []", grpcPackage.Ident("MethodDesc"), "{")
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for i, method := range service.Methods {
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if method.Desc.IsStreamingClient() || method.Desc.IsStreamingServer() {
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continue
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}
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g.P("{")
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g.P("MethodName: ", strconv.Quote(string(method.Desc.Name())), ",")
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g.P("Handler: ", handlerNames[i], ",")
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g.P("},")
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}
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g.P("},")
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g.P("Streams: []", grpcPackage.Ident("StreamDesc"), "{")
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for i, method := range service.Methods {
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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continue
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}
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g.P("{")
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g.P("StreamName: ", strconv.Quote(string(method.Desc.Name())), ",")
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g.P("Handler: ", handlerNames[i], ",")
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if method.Desc.IsStreamingServer() {
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g.P("ServerStreams: true,")
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}
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if method.Desc.IsStreamingClient() {
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g.P("ClientStreams: true,")
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}
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g.P("},")
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}
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g.P("},")
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g.P("Metadata: \"", file.Desc.Path(), "\",")
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g.P("}")
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g.P()
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}
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func clientSignature(g *protogen.GeneratedFile, method *protogen.Method) string {
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s := method.GoName + "(ctx " + g.QualifiedGoIdent(contextPackage.Ident("Context"))
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if !method.Desc.IsStreamingClient() {
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s += ", in *" + g.QualifiedGoIdent(method.Input.GoIdent)
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}
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s += ", opts ..." + g.QualifiedGoIdent(grpcPackage.Ident("CallOption")) + ") ("
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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s += "*" + g.QualifiedGoIdent(method.Output.GoIdent)
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} else {
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s += method.Parent.GoName + "_" + method.GoName + "Client"
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}
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s += ", error)"
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return s
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}
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func genClientMethod(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, method *protogen.Method, index int) {
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service := method.Parent
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sname := fmt.Sprintf("/%s/%s", service.Desc.FullName(), method.Desc.Name())
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if method.Desc.Options().(*descriptorpb.MethodOptions).GetDeprecated() {
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g.P(deprecationComment)
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}
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g.P("func (c *", unexport(service.GoName), "Client) ", clientSignature(g, method), "{")
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if !method.Desc.IsStreamingServer() && !method.Desc.IsStreamingClient() {
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g.P("out := new(", method.Output.GoIdent, ")")
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g.P(`err := c.cc.Invoke(ctx, "`, sname, `", in, out, opts...)`)
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g.P("if err != nil { return nil, err }")
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g.P("return out, nil")
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g.P("}")
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g.P()
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return
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}
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streamType := unexport(service.GoName) + method.GoName + "Client"
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serviceDescVar := service.GoName + "_ServiceDesc"
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g.P("stream, err := c.cc.NewStream(ctx, &", serviceDescVar, ".Streams[", index, `], "`, sname, `", opts...)`)
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g.P("if err != nil { return nil, err }")
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g.P("x := &", streamType, "{stream}")
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if !method.Desc.IsStreamingClient() {
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g.P("if err := x.ClientStream.SendMsg(in); err != nil { return nil, err }")
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g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
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}
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g.P("return x, nil")
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g.P("}")
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g.P()
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genSend := method.Desc.IsStreamingClient()
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genRecv := method.Desc.IsStreamingServer()
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genCloseAndRecv := !method.Desc.IsStreamingServer()
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// Stream auxiliary types and methods.
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g.P("type ", service.GoName, "_", method.GoName, "Client interface {")
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if genSend {
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g.P("Send(*", method.Input.GoIdent, ") error")
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}
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if genRecv {
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g.P("Recv() (*", method.Output.GoIdent, ", error)")
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}
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if genCloseAndRecv {
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g.P("CloseAndRecv() (*", method.Output.GoIdent, ", error)")
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}
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g.P(grpcPackage.Ident("ClientStream"))
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g.P("}")
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g.P()
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g.P("type ", streamType, " struct {")
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g.P(grpcPackage.Ident("ClientStream"))
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g.P("}")
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g.P()
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|
|
|
||
|
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if genSend {
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g.P("func (x *", streamType, ") Send(m *", method.Input.GoIdent, ") error {")
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g.P("return x.ClientStream.SendMsg(m)")
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g.P("}")
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g.P()
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}
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if genRecv {
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g.P("func (x *", streamType, ") Recv() (*", method.Output.GoIdent, ", error) {")
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g.P("m := new(", method.Output.GoIdent, ")")
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g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
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g.P("return m, nil")
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g.P("}")
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g.P()
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}
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if genCloseAndRecv {
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g.P("func (x *", streamType, ") CloseAndRecv() (*", method.Output.GoIdent, ", error) {")
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g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
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g.P("m := new(", method.Output.GoIdent, ")")
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g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
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g.P("return m, nil")
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g.P("}")
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g.P()
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||
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}
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||
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}
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||
|
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|
||
|
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func serverSignature(g *protogen.GeneratedFile, method *protogen.Method) string {
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||
|
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var reqArgs []string
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||
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ret := "error"
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||
|
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
|
||
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reqArgs = append(reqArgs, g.QualifiedGoIdent(contextPackage.Ident("Context")))
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||
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ret = "(*" + g.QualifiedGoIdent(method.Output.GoIdent) + ", error)"
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||
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}
|
||
|
|
if !method.Desc.IsStreamingClient() {
|
||
|
|
reqArgs = append(reqArgs, "*"+g.QualifiedGoIdent(method.Input.GoIdent))
|
||
|
|
}
|
||
|
|
if method.Desc.IsStreamingClient() || method.Desc.IsStreamingServer() {
|
||
|
|
reqArgs = append(reqArgs, method.Parent.GoName+"_"+method.GoName+"Server")
|
||
|
|
}
|
||
|
|
return method.GoName + "(" + strings.Join(reqArgs, ", ") + ") " + ret
|
||
|
|
}
|
||
|
|
|
||
|
|
func genServerMethod(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, method *protogen.Method) string {
|
||
|
|
service := method.Parent
|
||
|
|
hname := fmt.Sprintf("_%s_%s_Handler", service.GoName, method.GoName)
|
||
|
|
|
||
|
|
if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
|
||
|
|
g.P("func ", hname, "(srv interface{}, ctx ", contextPackage.Ident("Context"), ", dec func(interface{}) error, interceptor ", grpcPackage.Ident("UnaryServerInterceptor"), ") (interface{}, error) {")
|
||
|
|
g.P("in := new(", method.Input.GoIdent, ")")
|
||
|
|
g.P("if err := dec(in); err != nil { return nil, err }")
|
||
|
|
g.P("if interceptor == nil { return srv.(", service.GoName, "Server).", method.GoName, "(ctx, in) }")
|
||
|
|
g.P("info := &", grpcPackage.Ident("UnaryServerInfo"), "{")
|
||
|
|
g.P("Server: srv,")
|
||
|
|
g.P("FullMethod: ", strconv.Quote(fmt.Sprintf("/%s/%s", service.Desc.FullName(), method.Desc.Name())), ",")
|
||
|
|
g.P("}")
|
||
|
|
g.P("handler := func(ctx ", contextPackage.Ident("Context"), ", req interface{}) (interface{}, error) {")
|
||
|
|
g.P("return srv.(", service.GoName, "Server).", method.GoName, "(ctx, req.(*", method.Input.GoIdent, "))")
|
||
|
|
g.P("}")
|
||
|
|
g.P("return interceptor(ctx, in, info, handler)")
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
return hname
|
||
|
|
}
|
||
|
|
streamType := unexport(service.GoName) + method.GoName + "Server"
|
||
|
|
g.P("func ", hname, "(srv interface{}, stream ", grpcPackage.Ident("ServerStream"), ") error {")
|
||
|
|
if !method.Desc.IsStreamingClient() {
|
||
|
|
g.P("m := new(", method.Input.GoIdent, ")")
|
||
|
|
g.P("if err := stream.RecvMsg(m); err != nil { return err }")
|
||
|
|
g.P("return srv.(", service.GoName, "Server).", method.GoName, "(m, &", streamType, "{stream})")
|
||
|
|
} else {
|
||
|
|
g.P("return srv.(", service.GoName, "Server).", method.GoName, "(&", streamType, "{stream})")
|
||
|
|
}
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
|
||
|
|
genSend := method.Desc.IsStreamingServer()
|
||
|
|
genSendAndClose := !method.Desc.IsStreamingServer()
|
||
|
|
genRecv := method.Desc.IsStreamingClient()
|
||
|
|
|
||
|
|
// Stream auxiliary types and methods.
|
||
|
|
g.P("type ", service.GoName, "_", method.GoName, "Server interface {")
|
||
|
|
if genSend {
|
||
|
|
g.P("Send(*", method.Output.GoIdent, ") error")
|
||
|
|
}
|
||
|
|
if genSendAndClose {
|
||
|
|
g.P("SendAndClose(*", method.Output.GoIdent, ") error")
|
||
|
|
}
|
||
|
|
if genRecv {
|
||
|
|
g.P("Recv() (*", method.Input.GoIdent, ", error)")
|
||
|
|
}
|
||
|
|
g.P(grpcPackage.Ident("ServerStream"))
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
|
||
|
|
g.P("type ", streamType, " struct {")
|
||
|
|
g.P(grpcPackage.Ident("ServerStream"))
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
|
||
|
|
if genSend {
|
||
|
|
g.P("func (x *", streamType, ") Send(m *", method.Output.GoIdent, ") error {")
|
||
|
|
g.P("return x.ServerStream.SendMsg(m)")
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
}
|
||
|
|
if genSendAndClose {
|
||
|
|
g.P("func (x *", streamType, ") SendAndClose(m *", method.Output.GoIdent, ") error {")
|
||
|
|
g.P("return x.ServerStream.SendMsg(m)")
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
}
|
||
|
|
if genRecv {
|
||
|
|
g.P("func (x *", streamType, ") Recv() (*", method.Input.GoIdent, ", error) {")
|
||
|
|
g.P("m := new(", method.Input.GoIdent, ")")
|
||
|
|
g.P("if err := x.ServerStream.RecvMsg(m); err != nil { return nil, err }")
|
||
|
|
g.P("return m, nil")
|
||
|
|
g.P("}")
|
||
|
|
g.P()
|
||
|
|
}
|
||
|
|
|
||
|
|
return hname
|
||
|
|
}
|
||
|
|
|
||
|
|
const deprecationComment = "// Deprecated: Do not use."
|
||
|
|
|
||
|
|
func unexport(s string) string { return strings.ToLower(s[:1]) + s[1:] }
|