forked from TrueCloudLab/frostfs-api-go
[#77] protogen: Initial implementation
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
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commit
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115 changed files with 36376 additions and 20397 deletions
230
util/protogen/internalgengo/json.go
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230
util/protogen/internalgengo/json.go
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package internalgengo
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import (
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"fmt"
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"google.golang.org/protobuf/compiler/protogen"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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var (
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jwriterPackage = protogen.GoImportPath("github.com/mailru/easyjson/jwriter")
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jlexerPackage = protogen.GoImportPath("github.com/mailru/easyjson/jlexer")
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)
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func emitJSONMethods(g *protogen.GeneratedFile, msg *protogen.Message) {
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emitJSONMarshal(g, msg)
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emitJSONUnmarshal(g, msg)
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}
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func emitJSONUnmarshal(g *protogen.GeneratedFile, msg *protogen.Message) {
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g.P("// UnmarshalJSON implements the json.Unmarshaler interface.")
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g.P("func (x *", msg.GoIdent.GoName, ") UnmarshalJSON(data []byte) error {")
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g.P("r := ", jlexerPackage.Ident("Lexer"), "{Data: data}")
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g.P("x.UnmarshalEasyJSON(&r)")
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g.P("return r.Error()")
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g.P("}")
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g.P("func (x *", msg.GoIdent.GoName, ") UnmarshalEasyJSON(in *", jlexerPackage.Ident("Lexer"), ") {")
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g.P("isTopLevel := in.IsStart()")
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g.P("if in.IsNull() {")
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g.P("if isTopLevel { in.Consumed() }")
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g.P("in.Skip()")
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g.P("return")
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g.P("}")
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g.P("in.Delim('{')")
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g.P("for !in.IsDelim('}') {")
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g.P("key := in.UnsafeFieldName(false)")
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g.P("in.WantColon()")
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g.P("if in.IsNull() { in.Skip(); in.WantComma(); continue }")
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g.P("switch key {")
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for _, f := range msg.Fields {
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g.P(`case "`, fieldJSONName(f), `":`)
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if f.Oneof != nil {
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g.P("xx := new(", f.GoIdent, ")")
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g.P("x." + f.Oneof.GoName + " = xx")
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emitJSONFieldRead(g, f, "xx")
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continue
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}
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emitJSONFieldRead(g, f, "x")
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}
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g.P("}")
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g.P("in.WantComma()")
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g.P("}")
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g.P("in.Delim('}')")
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g.P("if isTopLevel { in.Consumed() }")
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g.P("}")
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}
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func emitJSONFieldRead(g *protogen.GeneratedFile, f *protogen.Field, name string) {
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g.P("{")
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defer g.P("}")
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if f.Desc.IsList() {
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g.P("var f ", fieldType(g, f)[2:])
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g.P("var list ", fieldType(g, f))
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g.P("in.Delim('[')")
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defer g.P("in.Delim(']')")
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g.P("for !in.IsDelim(']') {")
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} else {
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g.P("var f ", fieldType(g, f))
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}
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var template string
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switch f.Desc.Kind() {
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case protoreflect.BoolKind:
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template = "%s = in.Bool()"
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case protoreflect.EnumKind:
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g.Import(strconvPackage)
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enumType := fieldType(g, f).String()
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g.P("var parsedValue " + enumType)
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g.P(`switch v := in.Interface().(type) {
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case string:
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if vv, ok := `+enumType+`_value[v]; ok {
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parsedValue = `+enumType+`(vv)
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break
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}
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vv, err := `, strconvPackage.Ident("ParseInt"), `(v, 10, 32)
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if err != nil {
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in.AddError(err)
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return
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}
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parsedValue = `+enumType+`(vv)
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case float64:
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parsedValue = `+enumType+`(v)
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}`)
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template = "%s = parsedValue"
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case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
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template = "%s = in.Int32()"
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case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
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template = "%s = in.Uint32()"
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case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
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template = "%s = in.Int64()"
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case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
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template = "%s = in.Uint64()"
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case protoreflect.FloatKind:
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template = "%s = in.Float32()"
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case protoreflect.DoubleKind:
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template = "%s = in.Float64()"
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case protoreflect.StringKind:
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template = "%s = in.String()"
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case protoreflect.BytesKind:
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template = "%s = in.Bytes()"
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case protoreflect.MessageKind:
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if f.Desc.IsList() {
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g.P("f = new(", fieldType(g, f)[3:], ")")
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} else {
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g.P("f = new(", fieldType(g, f)[1:], ")")
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}
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template = "%s.UnmarshalEasyJSON(in)"
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case protoreflect.GroupKind:
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panic("unimplemented")
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}
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g.P(fmt.Sprintf(template, "f"))
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if f.Desc.IsList() {
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g.P("list = append(list, f)")
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g.P("in.WantComma()")
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g.P("}")
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g.P(name, ".", f.GoName, " = list")
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} else {
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g.P(name, ".", f.GoName, " = f")
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}
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}
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func emitJSONMarshal(g *protogen.GeneratedFile, msg *protogen.Message) {
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g.P("// MarshalJSON implements the json.Marshaler interface.")
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g.P("func (x *", msg.GoIdent.GoName, ") MarshalJSON() ([]byte, error) {")
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g.P("w := ", jwriterPackage.Ident("Writer"), "{}")
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g.P("x.MarshalEasyJSON(&w)")
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g.P("return w.Buffer.BuildBytes(), w.Error")
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g.P("}")
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g.P("func (x *", msg.GoIdent.GoName, ") MarshalEasyJSON(out *", jwriterPackage.Ident("Writer"), ") {")
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g.P(`if x == nil { out.RawString("null"); return }`)
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g.P("out.RawByte('{')")
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for i, f := range msg.Fields {
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if f.Oneof != nil {
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if f.Oneof.Fields[0] != f {
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continue
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}
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g.P("switch xx := x.", f.Oneof.GoName, ".(type) {")
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for _, ff := range f.Oneof.Fields {
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g.P("case *", ff.GoIdent, ":")
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emitJSONFieldWrite(g, ff, "xx", i == 0)
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}
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g.P("default:")
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g.P(`out.RawString("null")`)
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g.P("}")
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continue
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}
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emitJSONFieldWrite(g, f, "x", i == 0)
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}
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g.P("out.RawByte('}')")
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g.P("}")
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}
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func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name string, first bool) {
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g.P("{")
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defer g.P("}")
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g.P("const prefix string = ", `",\"`, fieldJSONName(f), `\":"`)
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if first {
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g.P("out.RawString(prefix[1:])")
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} else {
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g.P("out.RawString(prefix)")
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}
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selector := name + "." + f.GoName
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if f.Desc.IsList() {
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selector += "[i]"
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g.P("out.RawByte('[')")
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defer g.P("out.RawByte(']')")
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g.P("for i := range ", name, ".", f.GoName, " {")
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g.P("if i != 0 { out.RawByte(',') }")
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defer g.P("}")
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}
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var template string
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switch f.Desc.Kind() {
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case protoreflect.BoolKind:
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template = "out.Bool(%s)"
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case protoreflect.EnumKind:
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template = "out.Int32(int32(%s))"
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case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
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template = "out.Int32(%s)"
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case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
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template = "out.Uint32(%s)"
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case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
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template = "out.Int64(%s)"
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case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
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template = "out.Uint64(%s)"
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case protoreflect.FloatKind:
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template = "out.Float32(%s)"
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case protoreflect.DoubleKind:
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template = "out.Float64(%s)"
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case protoreflect.StringKind:
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template = "out.String(%s)"
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case protoreflect.BytesKind:
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template = "out.Base64Bytes(%s)"
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case protoreflect.MessageKind:
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template = "%s.MarshalEasyJSON(out)"
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case protoreflect.GroupKind:
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panic("unimplemented")
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}
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g.P(fmt.Sprintf(template, selector))
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}
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func fieldJSONName(f *protogen.Field) string {
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if f.Desc.HasJSONName() {
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return f.Desc.JSONName()
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}
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return string(f.Desc.Name())
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}
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