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main.go
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main.go
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// Copyright 2020-2022 Buf Technologies, Inc.
//
// 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 main
import (
"context"
"strings"
"github.com/bufbuild/buf/private/pkg/app/appproto"
"github.com/bufbuild/buf/private/pkg/protogenutil"
"github.com/bufbuild/buf/private/pkg/stringutil"
"google.golang.org/protobuf/compiler/protogen"
)
const (
contextPackage = protogen.GoImportPath("context")
connectGoPackage = protogen.GoImportPath("github.com/bufbuild/connect-go")
zapPackage = protogen.GoImportPath("go.uber.org/zap")
pluginName = "apiclientconnect"
)
func main() {
appproto.Main(context.Background(), protogenutil.NewNamedGoPackageHandler(handle))
}
func handle(helper protogenutil.NamedHelper, plugin *protogen.Plugin, goPackageFileSets []*protogenutil.GoPackageFileSet) error {
for _, goPackageFileSet := range goPackageFileSets {
if err := handleGoPackage(helper, plugin, goPackageFileSet); err != nil {
return err
}
}
return handleGlobal(helper, plugin, goPackageFileSets)
}
func handleGoPackage(helper protogenutil.NamedHelper, plugin *protogen.Plugin, goPackageFileSet *protogenutil.GoPackageFileSet) error {
if len(goPackageFileSet.Services()) == 0 {
return nil
}
if err := generatePackageFile(helper, plugin, goPackageFileSet); err != nil {
return err
}
for _, file := range goPackageFileSet.Files {
if len(file.Services) > 0 {
if err := generateServiceFile(helper, plugin, file); err != nil {
return err
}
}
}
return nil
}
func generatePackageFile(helper protogenutil.NamedHelper, plugin *protogen.Plugin, goPackageFileSet *protogenutil.GoPackageFileSet) error {
g, err := helper.NewPackageGeneratedFile(plugin, goPackageFileSet, pluginName)
if err != nil {
return err
}
contextGoIdentString := g.QualifiedGoIdent(contextPackage.Ident("Context"))
loggerGoIdentString := g.QualifiedGoIdent(zapPackage.Ident("Logger"))
apiclientGoImportPath, err := helper.NewPackageGoImportPath(
goPackageFileSet,
"apiclient",
)
if err != nil {
return err
}
providerGoIdent := apiclientGoImportPath.Ident("Provider")
providerGoIdentString := g.QualifiedGoIdent(providerGoIdent)
httpClientGoIdentString := g.QualifiedGoIdent(connectGoPackage.Ident("HTTPClient"))
interceptorGoIdentString := g.QualifiedGoIdent(connectGoPackage.Ident("Interceptor"))
unaryInterceptorFuncGoIdentString := g.QualifiedGoIdent(connectGoPackage.Ident("UnaryInterceptorFunc"))
// NewProvider constructor function
g.P(`// NewProvider returns a new Provider.`)
g.P(`func NewProvider(`)
g.P(`logger *`, loggerGoIdentString, `,`)
g.P(`httpClient `, httpClientGoIdentString, `,`)
g.P(`options `, `...ProviderOption`, `,`)
g.P(`) `, providerGoIdentString, `{`)
g.P(`provider := &provider{`)
g.P(`logger: logger,`)
g.P(`httpClient: httpClient,`)
g.P(`}`)
g.P(`for _, option := range options {`)
g.P(`option(provider)`)
g.P(`}`)
g.P(`return provider`)
g.P(`}`)
g.P()
// provider struct definition
g.P(`type provider struct {`)
g.P(`logger *`, loggerGoIdentString)
g.P(`httpClient `, httpClientGoIdentString)
g.P(`addressMapper func(string) string`)
g.P(`interceptors []`, interceptorGoIdentString)
g.P(`authInterceptorProvider func(string)`, unaryInterceptorFuncGoIdentString)
g.P(`}`)
g.P()
g.P(`// ProviderOption is an option for a new Provider.`)
g.P(`type ProviderOption func(*provider)`)
g.P()
g.P(`// WithAddressMapper maps the address with the given function.`)
g.P(`func WithAddressMapper(addressMapper func(string) string) ProviderOption {`)
g.P(`return func(provider *provider) {`)
g.P(`provider.addressMapper = addressMapper`)
g.P(`}`)
g.P(`}`)
g.P()
g.P(`// WithInterceptors adds the slice of interceptors to all clients returned from this provider.`)
g.P(`func WithInterceptors(interceptors []`, interceptorGoIdentString, `) ProviderOption {`)
g.P(`return func(provider *provider) {`)
g.P(`provider.interceptors = interceptors`)
g.P(`}`)
g.P(`}`)
g.P()
g.P(`// WithAuthInterceptorProvider configures a provider that, when invoked, returns an interceptor that can be added`)
g.P(`// to a client for setting the auth token`)
g.P(`func WithAuthInterceptorProvider(authInterceptorProvider func(string) `, unaryInterceptorFuncGoIdentString, `) ProviderOption {`)
g.P(`return func(provider *provider) {`)
g.P(`provider.authInterceptorProvider = authInterceptorProvider`)
g.P(`}`)
g.P(`}`)
g.P()
// Import path for the api named_go_package
apiGoImportPath, err := helper.NewPackageGoImportPath(
goPackageFileSet,
"api",
)
if err != nil {
return err
}
// Import path for the connect named_go_package
connectGoImportPath, err := helper.NewPackageGoImportPath(
goPackageFileSet,
"connect",
)
if err != nil {
return err
}
withInterceptorsGoIdentString := g.QualifiedGoIdent(connectGoPackage.Ident("WithInterceptors"))
// Iterate over the services and create a constructor function for each
for _, service := range goPackageFileSet.Services() {
interfaceName := service.GoName
structName := protogenutil.GetUnexportGoName(interfaceName)
interfaceGoIdent := apiGoImportPath.Ident(interfaceName)
interfaceGoIdentString := g.QualifiedGoIdent(interfaceGoIdent)
newClientGoIdent := connectGoImportPath.Ident("New" + interfaceName + "Client")
newClientGoIdentString := g.QualifiedGoIdent(newClientGoIdent)
g.P(`// New`, interfaceName, ` creates a new `, interfaceName)
g.P(`func (p *provider) New`, interfaceName, `(ctx `, contextGoIdentString, `, address string) (`, interfaceGoIdentString, `, error) {`)
g.P(`interceptors := p.interceptors`)
g.P(`if p.authInterceptorProvider != nil {`)
g.P(`interceptor := p.authInterceptorProvider(address)`)
g.P(`interceptors = append(interceptors, interceptor)`)
g.P(`}`)
g.P(`if p.addressMapper != nil {`)
g.P(`address = p.addressMapper(address)`)
g.P(`}`)
g.P(`return &`, structName, `Client{`)
g.P(`logger: p.logger,`)
g.P(`client: `, newClientGoIdentString, `(`)
g.P(`p.httpClient,`)
g.P(`address,`)
g.P(withInterceptorsGoIdentString, `(interceptors...),`)
g.P(`),`)
g.P(`}, nil`)
g.P(`}`)
g.P()
}
return nil
}
func generateServiceFile(helper protogenutil.NamedHelper, plugin *protogen.Plugin, file *protogen.File) error {
g, err := helper.NewGeneratedFile(plugin, file, pluginName)
if err != nil {
return err
}
contextGoIdentString := g.QualifiedGoIdent(contextPackage.Ident("Context"))
loggerGoIdentString := g.QualifiedGoIdent(zapPackage.Ident("Logger"))
// Import path for the connect named_go_package
connectGoImportPath, err := helper.NewGoImportPath(
file,
"connect",
)
if err != nil {
return err
}
for _, service := range file.Services {
interfaceName := service.GoName
structName := protogenutil.GetUnexportGoName(interfaceName)
clientGoIdent := connectGoImportPath.Ident(interfaceName + "Client")
clientGoIdentString := g.QualifiedGoIdent(clientGoIdent)
newRequestGoIdent := connectGoPackage.Ident("NewRequest")
newRequestGoIdentString := g.QualifiedGoIdent(newRequestGoIdent)
g.P(`type `, structName, `Client struct {`)
g.P(`logger *`, loggerGoIdentString)
g.P(`client `, clientGoIdentString)
g.P(`}`)
g.P()
for _, method := range service.Methods {
if err := protogenutil.ValidateMethodUnary(method); err != nil {
return err
}
requestParameterStrings, responseParameterStrings, err := protogenutil.GetRequestAndResponseParameterStrings(g, method.Input.Fields, method.Output.Fields)
if err != nil {
return err
}
funcName := method.GoName
funcParameterStrings := append([]string{`ctx ` + contextGoIdentString}, requestParameterStrings...)
funcReturnStrings := append(responseParameterStrings, `_ error`)
if len(funcParameterStrings) > 2 || len(funcReturnStrings) > 2 {
g.P(method.Comments.Leading, `func (s *`, structName, `Client) `, funcName, `(`)
for _, funcParameterString := range funcParameterStrings {
g.P(funcParameterString, `,`)
}
g.P(`) (`, strings.Join(funcReturnStrings, `, `), `) {`)
} else {
g.P(method.Comments.Leading, `func (s *`, structName, `Client) `, funcName, `(`, strings.Join(funcParameterStrings, `, `), `) (`, strings.Join(funcReturnStrings, `, `), `) {`)
}
requestGoIdentString := g.QualifiedGoIdent(method.Input.GoIdent)
if len(funcReturnStrings) == 1 {
g.P(`_, err := s.client.`, funcName, `(`)
} else {
g.P(`response, err := s.client.`, funcName, `(`)
}
g.P(`ctx,`)
g.P(newRequestGoIdentString, `(`)
g.P(`&`, requestGoIdentString, `{`)
for _, field := range method.Input.Fields {
g.P(field.GoName, `: `, protogenutil.GetUnexportGoName(field.GoName), `,`)
}
g.P(`}),`)
g.P(`)`)
g.P(`if err != nil {`)
errorReturnString, err := protogenutil.GetParameterErrorReturnString(
g,
method.Output.Fields,
`err`,
)
if err != nil {
return err
}
g.P(errorReturnString)
g.P(`}`)
returnValueStrings := make([]string, 0, len(method.Output.Fields))
for _, field := range method.Output.Fields {
returnValueStrings = append(returnValueStrings, "response.Msg."+field.GoName)
}
returnValueStrings = append(returnValueStrings, "nil")
g.P(`return `, strings.Join(returnValueStrings, ", "))
g.P(`}`)
g.P()
}
g.P()
}
return nil
}
func handleGlobal(helper protogenutil.NamedHelper, plugin *protogen.Plugin, goPackageFileSets []*protogenutil.GoPackageFileSet) error {
goPackageFileSetsWithServices := make([]*protogenutil.GoPackageFileSet, 0, len(goPackageFileSets))
for _, goPackageFileSet := range goPackageFileSets {
if len(goPackageFileSet.Services()) > 0 {
goPackageFileSetsWithServices = append(goPackageFileSetsWithServices, goPackageFileSet)
}
}
if len(goPackageFileSetsWithServices) == 0 {
return nil
}
g, err := helper.NewGlobalGeneratedFile(plugin, pluginName)
if err != nil {
return err
}
httpClientGoIdentString := g.QualifiedGoIdent(connectGoPackage.Ident("HTTPClient"))
loggerGoIdentString := g.QualifiedGoIdent(zapPackage.Ident("Logger"))
globalAPIClientGoImportPath, err := helper.NewGlobalGoImportPath("apiclient")
if err != nil {
return err
}
globalProviderGoIdent := globalAPIClientGoImportPath.Ident("Provider")
globalProviderGoIdentString := g.QualifiedGoIdent(globalProviderGoIdent)
g.P(`// NewProvider returns a new provider.`)
g.P(`func NewProvider(`)
g.P(`logger *`, loggerGoIdentString, `,`)
g.P(`httpClient `, httpClientGoIdentString, `,`)
g.P(`options `, `...ProviderOption`, `,`)
g.P(`) `, globalProviderGoIdentString, `{`)
g.P(`providerOptions := &providerOptions{}`)
g.P(`for _, option := range options {`)
g.P(`option(providerOptions)`)
g.P(`}`)
g.P(`return &provider{`)
for _, goPackageFileSet := range goPackageFileSetsWithServices {
apiclientconnectGoImportPath, err := helper.NewPackageGoImportPath(goPackageFileSet, "apiclientconnect")
if err != nil {
return err
}
newProviderGoIdent := apiclientconnectGoImportPath.Ident("NewProvider")
newProviderGoIdentString := g.QualifiedGoIdent(newProviderGoIdent)
optionsName := protogenutil.GetUnexportGoName(
stringutil.ToPascalCase(goPackageFileSet.ProtoPackage),
) + "ProviderOptions"
providerName := protogenutil.GetUnexportGoName(
stringutil.ToPascalCase(goPackageFileSet.ProtoPackage),
) + "Provider"
g.P(providerName, `:`, newProviderGoIdentString, `(`)
g.P(`logger,`)
g.P(`httpClient,`)
g.P(`providerOptions.`, optionsName, `...,`)
g.P(`),`)
}
g.P(`}`)
g.P(`}`)
g.P()
g.P(`type provider struct {`)
for _, goPackageFileSet := range goPackageFileSetsWithServices {
goImportPath, err := helper.NewPackageGoImportPath(goPackageFileSet, "apiclient")
if err != nil {
return err
}
providerGoIdent := goImportPath.Ident("Provider")
providerGoIdentString := g.QualifiedGoIdent(providerGoIdent)
providerName := protogenutil.GetUnexportGoName(
stringutil.ToPascalCase(goPackageFileSet.ProtoPackage),
) + "Provider"
g.P(providerName, ` `, providerGoIdentString)
}
g.P(`}`)
g.P()
g.P(`// ProviderOption is an option for a new Provider.`)
g.P(`type ProviderOption func(*providerOptions)`)
g.P()
for _, goPackageFileSet := range goPackageFileSetsWithServices {
apiclientGoImportPath, err := helper.NewPackageGoImportPath(goPackageFileSet, "apiclient")
if err != nil {
return err
}
providerGoIdent := apiclientGoImportPath.Ident("Provider")
providerGoIdentString := g.QualifiedGoIdent(providerGoIdent)
providerName := protogenutil.GetUnexportGoName(
stringutil.ToPascalCase(goPackageFileSet.ProtoPackage),
) + "Provider"
funcName := stringutil.ToPascalCase(goPackageFileSet.ProtoPackage)
g.P(`func (p *provider) `, funcName, `() `, providerGoIdentString, `{`)
g.P(`return p.`, providerName)
g.P(`}`)
g.P()
}
g.P(`type providerOptions struct {`)
for _, goPackageFileSet := range goPackageFileSetsWithServices {
goImportPath, err := helper.NewPackageGoImportPath(goPackageFileSet, "apiclientconnect")
if err != nil {
return err
}
providerOptionGoIdent := goImportPath.Ident("ProviderOption")
providerOptionGoIdentString := g.QualifiedGoIdent(providerOptionGoIdent)
optionsName := protogenutil.GetUnexportGoName(
stringutil.ToPascalCase(goPackageFileSet.ProtoPackage),
) + "ProviderOptions"
g.P(optionsName, `[]`, providerOptionGoIdentString)
}
g.P(`}`)
return nil
}