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// Copyright (c) 2020 Cisco and/or its affiliates.
//
// 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 binapigen
import (
"fmt"
"strconv"
"github.com/sirupsen/logrus"
)
func genMessageSize(g *GenFile, name string, fields []*Field) {
g.P("func (m *", name, ") Size() (size int) {")
g.P("if m == nil { return 0 }")
sizeBaseType := func(typ, name string, length int, sizefrom string) {
switch typ {
case STRING:
if length > 0 {
g.P("size += ", length, " // ", name)
} else {
g.P("size += 4 + len(", name, ")", " // ", name)
}
default:
var size = BaseTypeSizes[typ]
if sizefrom != "" {
g.P("size += ", size, " * len(", name, ")", " // ", name)
} else {
if length > 0 {
g.P("size += ", size, " * ", length, " // ", name)
} else {
g.P("size += ", size, " // ", name)
}
}
}
}
lvl := 0
var sizeFields func(fields []*Field, parentName string)
sizeFields = func(fields []*Field, parentName string) {
lvl++
defer func() { lvl-- }()
getFieldName := func(name string) string {
return fmt.Sprintf("%s.%s", parentName, name)
}
for _, field := range fields {
name := getFieldName(field.GoName)
var sizeFromName string
if field.FieldSizeFrom != nil {
sizeFromName = getFieldName(field.FieldSizeFrom.GoName)
}
if _, ok := BaseTypesGo[field.Type]; ok {
sizeBaseType(field.Type, name, field.Length, sizeFromName)
continue
}
if field.Array {
index := fmt.Sprintf("j%d", lvl)
if field.Length > 0 {
g.P("for ", index, " := 0; ", index, " < ", field.Length, "; ", index, "++ {")
} else if field.FieldSizeFrom != nil {
g.P("for ", index, " := 0; ", index, " < len(", name, "); ", index, "++ {")
}
if field.Length == 0 || field.SizeFrom != "" {
char := fmt.Sprintf("s%d", lvl)
g.P("var ", char, " ", fieldGoType(g, field))
g.P("_ = ", char)
g.P("if ", index, " < len(", name, ") { ", char, " = ", name, "[", index, "] }")
name = char
} else {
name = fmt.Sprintf("%s[%s]", name, index)
}
}
switch {
case field.TypeEnum != nil:
enum := field.TypeEnum
if _, ok := BaseTypesGo[enum.Type]; ok {
sizeBaseType(enum.Type, name, 0, "")
} else {
logrus.Panicf("\t// ??? ENUM %s %s\n", name, enum.Type)
}
case field.TypeAlias != nil:
alias := field.TypeAlias
if typ := alias.TypeStruct; typ != nil {
sizeFields(typ.Fields, name)
} else {
sizeBaseType(alias.Type, name, alias.Length, "")
}
case field.TypeStruct != nil:
typ := field.TypeStruct
sizeFields(typ.Fields, name)
case field.TypeUnion != nil:
union := field.TypeUnion
maxSize := getUnionSize(union)
sizeBaseType("u8", name, maxSize, "")
default:
logrus.Panicf("\t// ??? buf[pos] = %s (%s)\n", name, field.Type)
}
if field.Array {
g.P("}")
}
}
}
sizeFields(fields, "m")
g.P("return size")
g.P("}")
}
func genMessageMarshal(g *GenFile, name string, fields []*Field) {
g.P("func (m *", name, ") Marshal(b []byte) ([]byte, error) {")
g.P("if b == nil {")
g.P("b = make([]byte, m.Size())")
g.P("}")
g.P("buf := ", govppCodecPkg.Ident("NewBuffer"), "(b)")
encodeFields(g, fields, "m", 0)
g.P("return buf.Bytes(), nil")
g.P("}")
}
func encodeFields(g *GenFile, fields []*Field, parentName string, lvl int) {
getFieldName := func(name string) string {
return fmt.Sprintf("%s.%s", parentName, name)
}
for _, field := range fields {
name := getFieldName(field.GoName)
encodeField(g, field, name, getFieldName, lvl)
}
}
func encodeField(g *GenFile, field *Field, name string, getFieldName func(name string) string, lvl int) {
if f := field.FieldSizeOf; f != nil {
if _, ok := BaseTypesGo[field.Type]; ok {
val := fmt.Sprintf("len(%s)", getFieldName(f.GoName))
encodeBaseType(g, field.Type, "int", val, 0, "", false)
return
} else {
panic(fmt.Sprintf("failed to encode base type of sizefrom field: %s (%s)", field.Name, field.Type))
}
}
var sizeFromName string
if field.FieldSizeFrom != nil {
sizeFromName = getFieldName(field.FieldSizeFrom.GoName)
}
if _, ok := BaseTypesGo[field.Type]; ok {
encodeBaseType(g, field.Type, fieldGoType(g, field), name, field.Length, sizeFromName, true)
return
}
if field.Array {
index := fmt.Sprintf("j%d", lvl)
if field.Length > 0 {
g.P("for ", index, " := 0; ", index, " < ", field.Length, "; ", index, "++ {")
} else if field.SizeFrom != "" {
g.P("for ", index, " := 0; ", index, " < len(", name, "); ", index, "++ {")
}
if field.Length == 0 || field.SizeFrom != "" {
char := fmt.Sprintf("v%d", lvl)
g.P("var ", char, " ", fieldGoType(g, field), "// ", field.GoName)
g.P("if ", index, " < len(", name, ") { ", char, " = ", name, "[", index, "] }")
name = char
} else {
name = fmt.Sprintf("%s[%s]", name, index)
}
}
switch {
case field.TypeEnum != nil:
encodeBaseType(g, field.TypeEnum.Type, fieldGoType(g, field), name, 0, "", false)
case field.TypeAlias != nil:
alias := field.TypeAlias
if typ := alias.TypeStruct; typ != nil {
encodeFields(g, typ.Fields, name, lvl+1)
} else {
if alias.Length > 0 {
encodeBaseType(g, alias.Type, BaseTypesGo[alias.Type], name, alias.Length, "", false)
} else {
encodeBaseType(g, alias.Type, fieldGoType(g, field), name, 0, "", false)
}
}
case field.TypeStruct != nil:
encodeFields(g, field.TypeStruct.Fields, name, lvl+1)
case field.TypeUnion != nil:
maxSize := getUnionSize(field.TypeUnion)
g.P("buf.EncodeBytes(", name, ".", fieldUnionData, "[:], ", maxSize, ")")
default:
logrus.Panicf("\t// ??? buf[pos] = %s (%s)\n", name, field.Type)
}
if field.Array {
g.P("}")
}
}
func encodeBaseType(g *GenFile, typ, orig, name string, length int, sizefrom string, alloc bool) {
isArray := length > 0 || sizefrom != ""
if isArray {
switch typ {
case U8:
if alloc {
g.P("buf.EncodeBytes(", name, ", ", length, ")")
} else {
g.P("buf.EncodeBytes(", name, "[:], ", length, ")")
}
return
case I8, I16, U16, I32, U32, I64, U64, F64, BOOL:
gotype := BaseTypesGo[typ]
if length != 0 {
g.P("for i := 0; i < ", length, "; i++ {")
} else if sizefrom != "" {
g.P("for i := 0; i < len(", name, "); i++ {")
}
if alloc {
g.P("var x ", gotype)
g.P("if i < len(", name, ") { x = ", gotype, "(", name, "[i]) }")
name = "x"
}
}
}
conv := func(s string) string {
if gotype, ok := BaseTypesGo[typ]; !ok || gotype != orig {
return fmt.Sprintf("%s(%s)", gotype, s)
}
return s
}
switch typ {
case I8, I16, I32, I64:
typsize := BaseTypeSizes[typ]
g.P("buf.EncodeInt", typsize*8, "(", conv(name), ")")
case U8, U16, U32, U64:
typsize := BaseTypeSizes[typ]
g.P("buf.EncodeUint", typsize*8, "(", conv(name), ")")
case F64:
g.P("buf.EncodeFloat64(", conv(name), ")")
case BOOL:
g.P("buf.EncodeBool(", name, ")")
case STRING:
g.P("buf.EncodeString(", name, ", ", length, ")")
default:
logrus.Panicf("// ??? %s %s\n", name, typ)
}
if isArray {
switch typ {
case I8, U8, I16, U16, I32, U32, I64, U64, F64, BOOL:
g.P("}")
}
}
}
func genMessageUnmarshal(g *GenFile, name string, fields []*Field) {
g.P("func (m *", name, ") Unmarshal(b []byte) error {")
if len(fields) > 0 {
g.P("buf := ", govppCodecPkg.Ident("NewBuffer"), "(b)")
decodeFields(g, fields, "m", 0)
}
g.P("return nil")
g.P("}")
}
func decodeFields(g *GenFile, fields []*Field, parentName string, lvl int) {
getFieldName := func(name string) string {
return fmt.Sprintf("%s.%s", parentName, name)
}
for _, field := range fields {
name := getFieldName(field.GoName)
decodeField(g, field, name, getFieldName, lvl)
}
}
func decodeField(g *GenFile, field *Field, name string, getFieldName func(string) string, lvl int) {
var sizeFromName string
if field.FieldSizeFrom != nil {
sizeFromName = getFieldName(field.FieldSizeFrom.GoName)
}
if _, ok := BaseTypesGo[field.Type]; ok {
decodeBaseType(g, field.Type, fieldGoType(g, field), name, field.Length, sizeFromName, true)
return
}
if field.Array {
index := fmt.Sprintf("j%d", lvl)
if field.Length > 0 {
g.P("for ", index, " := 0; ", index, " < ", field.Length, ";", index, "++ {")
} else if field.SizeFrom != "" {
g.P(name, " = make(", getFieldType(g, field), ", ", sizeFromName, ")")
g.P("for ", index, " := 0; ", index, " < len(", name, ");", index, "++ {")
}
name = fmt.Sprintf("%s[%s]", name, index)
}
if enum := field.TypeEnum; enum != nil {
if _, ok := BaseTypesGo[enum.Type]; ok {
decodeBaseType(g, enum.Type, fieldGoType(g, field), name, 0, "", false)
} else {
logrus.Panicf("\t// ??? ENUM %s %s\n", name, enum.Type)
}
} else if alias := field.TypeAlias; alias != nil {
if typ := alias.TypeStruct; typ != nil {
decodeFields(g, typ.Fields, name, lvl+1)
} else {
if alias.Length > 0 {
decodeBaseType(g, alias.Type, BaseTypesGo[alias.Type], name, alias.Length, "", false)
} else {
decodeBaseType(g, alias.Type, fieldGoType(g, field), name, 0, "", false)
}
}
} else if typ := field.TypeStruct; typ != nil {
decodeFields(g, typ.Fields, name, lvl+1)
} else if union := field.TypeUnion; union != nil {
maxSize := getUnionSize(union)
g.P("copy(", name, ".", fieldUnionData, "[:], buf.DecodeBytes(", maxSize, "))")
} else {
logrus.Panicf("\t// ??? %s (%v)\n", field.GoName, field.Type)
}
if field.Array {
g.P("}")
}
}
func decodeBaseType(g *GenFile, typ, orig, name string, length int, sizefrom string, alloc bool) {
isArray := length > 0 || sizefrom != ""
if isArray {
var size string
switch {
case length > 0:
size = strconv.Itoa(length)
case sizefrom != "":
size = sizefrom
}
switch typ {
case U8:
if alloc {
g.P(name, " = make([]byte, ", size, ")")
g.P("copy(", name, ", buf.DecodeBytes(len(", name, ")))")
} else {
g.P("copy(", name, "[:], buf.DecodeBytes(", size, "))")
}
return
case I8, I16, U16, I32, U32, I64, U64, F64, BOOL:
if alloc {
g.P(name, " = make([]", orig, ", ", size, ")")
}
g.P("for i := 0; i < len(", name, "); i++ {")
name = fmt.Sprintf("%s[i]", name)
}
}
conv := func(s string) string {
if gotype, ok := BaseTypesGo[typ]; !ok || gotype != orig {
return fmt.Sprintf("%s(%s)", orig, s)
}
return s
}
switch typ {
case I8, I16, I32, I64:
typsize := BaseTypeSizes[typ]
g.P(name, " = ", conv(fmt.Sprintf("buf.DecodeInt%d()", typsize*8)))
case U8, U16, U32, U64:
typsize := BaseTypeSizes[typ]
g.P(name, " = ", conv(fmt.Sprintf("buf.DecodeUint%d()", typsize*8)))
case F64:
g.P(name, " = ", conv("buf.DecodeFloat64()"))
case BOOL:
g.P(name, " = buf.DecodeBool()")
case STRING:
g.P(name, " = buf.DecodeString(", length, ")")
default:
logrus.Panicf("\t// ??? %s %s\n", name, typ)
}
if isArray {
switch typ {
case I8, U8, I16, U16, I32, U32, I64, U64, F64, BOOL:
g.P("}")
}
}
}
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