/
generate.go
221 lines (178 loc) · 4.25 KB
/
generate.go
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package internal
import (
"errors"
"flag"
"path"
"github.com/iancoleman/strcase"
"github.com/thecodedproject/gopkg"
"github.com/thecodedproject/gopkg/tmpl"
"github.com/thecodedproject/servicegen/internal/proto"
)
var (
protoFile = flag.String("proto", "", "path to proto file")
)
func Generate() error {
flag.Parse()
if *protoFile == "" {
return errors.New("`proto` must be set")
}
apiProto, err := proto.Parse(*protoFile)
if err != nil {
return err
}
s, err := createServiceDefinition(apiProto)
if err != nil {
return err
}
var files []gopkg.FileContents
files, err = appendFileContents(
files,
fileApi(s),
fileClientGrpcClient(s),
fileClientLocalClient(s),
fileClientTestFiles(s),
fileInternalFiles(s),
filePbTypeConversion(s),
fileResources(s),
fileServerGrpcServer(s),
fileTypes(s),
)
if err != nil {
return err
}
return gopkg.LintAndGenerate(files)
}
func appendFileContents(
files []gopkg.FileContents,
fileFuncs ...func() ([]gopkg.FileContents, error),
) ([]gopkg.FileContents, error) {
for _, fileFunc := range fileFuncs {
newFiles, err := fileFunc()
if err != nil {
return nil, err
}
files = append(files, newFiles...)
}
return files, nil
}
type serviceDefinition struct {
Name string
ImportPath string
ApiFuncs []gopkg.DeclFunc
ResourcesDecl gopkg.DeclVar
ApiProto proto.Service
ClientImport gopkg.ImportAndAlias
InternalImport gopkg.ImportAndAlias
PbImport gopkg.ImportAndAlias
ResourcesImport gopkg.ImportAndAlias
}
func createServiceDefinition(
apiProto proto.Service,
) (serviceDefinition, error) {
importPath, err := gopkg.PackageImportPath(".")
if err != nil {
return serviceDefinition{}, err
}
apiFuncs, err := apiFuncSignatures(apiProto, importPath)
if err != nil {
return serviceDefinition{}, err
}
resImp := makeImportWithAlias(importPath, "resources")
sName := strcase.ToSnake(apiProto.ServiceName)
return serviceDefinition{
Name: sName,
ImportPath: importPath,
ApiFuncs: apiFuncs,
ResourcesDecl: gopkg.DeclVar{
Name: "r",
Type: gopkg.TypeNamed{
Name: "Resources",
Import: resImp.Import,
ValueType: gopkg.TypeInterface{},
},
},
ApiProto: apiProto,
ClientImport: makeImportWithAlias(importPath, "client"),
InternalImport: makeImportWithAlias(importPath, "internal"),
PbImport: makeImportWithAlias(importPath, "pb"),
ResourcesImport: resImp,
}, nil
}
func apiFuncSignatures(
apiProto proto.Service,
serviceImportPath string,
) ([]gopkg.DeclFunc, error) {
funcs := make([]gopkg.DeclFunc, len(apiProto.Methods))
for iM, m := range apiProto.Methods {
reqMessage, err := apiProto.MethodRequestMessage(m.Name)
if err != nil {
return nil, err
}
respMessage, err := apiProto.MethodResponseMessage(m.Name)
if err != nil {
return nil, err
}
funcs[iM] = tmpl.FuncWithContextAndError(
m.Name,
argsFromProtoMessage(reqMessage, serviceImportPath),
unnamedArgsFromProtoMessage(respMessage, serviceImportPath),
)
}
return funcs, nil
}
func makeImportWithAlias(
baseImportPath string,
subPath string,
) gopkg.ImportAndAlias {
i := path.Join(baseImportPath, subPath)
return gopkg.ImportAndAlias{
Import: i,
Alias: subPath,
}
}
func argsFromProtoMessage(
m proto.Message,
serviceImportPath string,
) []gopkg.DeclVar {
args := make([]gopkg.DeclVar, len(m.Fields))
for iF, f := range m.Fields {
args[iF] = gopkg.DeclVar{
Name: strcase.ToLowerCamel(f.Name),
Type: goTypeFromProtoType(f.Type, serviceImportPath),
}
}
return args
}
func unnamedArgsFromProtoMessage(
m proto.Message,
serviceImportPath string,
) []gopkg.DeclVar {
args := make([]gopkg.DeclVar, len(m.Fields))
for iF, f := range m.Fields {
args[iF] = gopkg.DeclVar{
Type: goTypeFromProtoType(f.Type, serviceImportPath),
}
}
return args
}
func goTypeFromProtoType(
protoType string,
serviceImportPath string,
) gopkg.Type {
switch protoType {
case "bool": return gopkg.TypeBool{}
case "bytes":
return gopkg.TypeArray{
ValueType: gopkg.TypeByte{},
}
case "float": return gopkg.TypeFloat32{}
case "int32": return gopkg.TypeInt32{}
case "int64": return gopkg.TypeInt64{}
case "string": return gopkg.TypeString{}
}
return gopkg.TypeNamed{
Name: protoType,
Import: serviceImportPath,
ValueType: gopkg.TypeStruct{},
}
}