lotus/gen/api/proxygen.go

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package main
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"io"
"os"
"path/filepath"
"strings"
"text/template"
"unicode"
"golang.org/x/xerrors"
)
type methodMeta struct {
node ast.Node
ftype *ast.FuncType
}
type Visitor struct {
Methods map[string]map[string]*methodMeta
Include map[string][]string
}
func (v *Visitor) Visit(node ast.Node) ast.Visitor {
st, ok := node.(*ast.TypeSpec)
if !ok {
return v
}
iface, ok := st.Type.(*ast.InterfaceType)
if !ok {
return v
}
if v.Methods[st.Name.Name] == nil {
v.Methods[st.Name.Name] = map[string]*methodMeta{}
}
for _, m := range iface.Methods.List {
switch ft := m.Type.(type) {
case *ast.Ident:
v.Include[st.Name.Name] = append(v.Include[st.Name.Name], ft.Name)
case *ast.FuncType:
v.Methods[st.Name.Name][m.Names[0].Name] = &methodMeta{
node: m,
ftype: ft,
}
}
}
return v
}
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func main() {
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// latest (v1)
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if err := generate("./api", "api", "api", "./api/proxy_gen.go"); err != nil {
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fmt.Println("error: ", err)
}
// v0
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if err := generate("./api/v0api", "v0api", "v0api", "./api/v0api/proxy_gen.go"); err != nil {
fmt.Println("error: ", err)
}
}
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func typeName(e ast.Expr, pkg string) (string, error) {
switch t := e.(type) {
case *ast.SelectorExpr:
return t.X.(*ast.Ident).Name + "." + t.Sel.Name, nil
case *ast.Ident:
pstr := t.Name
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if !unicode.IsLower(rune(pstr[0])) && pkg != "api" {
pstr = "api." + pstr // todo src pkg name
}
return pstr, nil
case *ast.ArrayType:
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subt, err := typeName(t.Elt, pkg)
if err != nil {
return "", err
}
return "[]" + subt, nil
case *ast.StarExpr:
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subt, err := typeName(t.X, pkg)
if err != nil {
return "", err
}
return "*" + subt, nil
case *ast.MapType:
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k, err := typeName(t.Key, pkg)
if err != nil {
return "", err
}
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v, err := typeName(t.Value, pkg)
if err != nil {
return "", err
}
return "map[" + k + "]" + v, nil
case *ast.StructType:
if len(t.Fields.List) != 0 {
return "", xerrors.Errorf("can't struct")
}
return "struct{}", nil
case *ast.InterfaceType:
if len(t.Methods.List) != 0 {
return "", xerrors.Errorf("can't interface")
}
return "interface{}", nil
case *ast.ChanType:
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subt, err := typeName(t.Value, pkg)
if err != nil {
return "", err
}
if t.Dir == ast.SEND {
subt = "->chan " + subt
} else {
subt = "<-chan " + subt
}
return subt, nil
default:
return "", xerrors.Errorf("unknown type")
}
}
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func generate(path, pkg, outpkg, outfile string) error {
fset := token.NewFileSet()
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apiDir, err := filepath.Abs(path)
if err != nil {
return err
}
outfile, err = filepath.Abs(outfile)
if err != nil {
return err
}
pkgs, err := parser.ParseDir(fset, apiDir, nil, parser.AllErrors|parser.ParseComments)
if err != nil {
return err
}
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ap := pkgs[pkg]
v := &Visitor{make(map[string]map[string]*methodMeta), map[string][]string{}}
ast.Walk(v, ap)
type methodInfo struct {
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Name string
node ast.Node
Tags map[string][]string
NamedParams, ParamNames, Results, DefRes string
}
type strinfo struct {
Name string
Methods map[string]*methodInfo
Include []string
}
type meta struct {
Infos map[string]*strinfo
Imports map[string]string
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OutPkg string
}
m := &meta{
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OutPkg: outpkg,
Infos: map[string]*strinfo{},
Imports: map[string]string{},
}
for fn, f := range ap.Files {
if strings.HasSuffix(fn, "gen.go") {
continue
}
//fmt.Println("F:", fn)
cmap := ast.NewCommentMap(fset, f, f.Comments)
for _, im := range f.Imports {
m.Imports[im.Path.Value] = im.Path.Value
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if im.Name != nil {
m.Imports[im.Path.Value] = im.Name.Name + " " + m.Imports[im.Path.Value]
}
}
for ifname, methods := range v.Methods {
if _, ok := m.Infos[ifname]; !ok {
m.Infos[ifname] = &strinfo{
Name: ifname,
Methods: map[string]*methodInfo{},
Include: v.Include[ifname],
}
}
info := m.Infos[ifname]
for mname, node := range methods {
filteredComments := cmap.Filter(node.node).Comments()
if _, ok := info.Methods[mname]; !ok {
var params, pnames []string
for _, param := range node.ftype.Params.List {
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pstr, err := typeName(param.Type, outpkg)
if err != nil {
return err
}
c := len(param.Names)
if c == 0 {
c = 1
}
for i := 0; i < c; i++ {
pname := fmt.Sprintf("p%d", len(params))
pnames = append(pnames, pname)
params = append(params, pname+" "+pstr)
}
}
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results := []string{}
for _, result := range node.ftype.Results.List {
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rs, err := typeName(result.Type, outpkg)
if err != nil {
return err
}
results = append(results, rs)
}
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defRes := ""
if len(results) > 1 {
defRes = results[0]
switch {
case defRes[0] == '*' || defRes[0] == '<', defRes == "interface{}":
defRes = "nil"
case defRes == "bool":
defRes = "false"
case defRes == "string":
defRes = `""`
case defRes == "int", defRes == "int64", defRes == "uint64", defRes == "uint":
defRes = "0"
default:
defRes = "*new(" + defRes + ")"
}
defRes += ", "
}
info.Methods[mname] = &methodInfo{
Name: mname,
node: node.node,
Tags: map[string][]string{},
NamedParams: strings.Join(params, ", "),
ParamNames: strings.Join(pnames, ", "),
Results: strings.Join(results, ", "),
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DefRes: defRes,
}
}
// try to parse tag info
if len(filteredComments) > 0 {
tagstr := filteredComments[len(filteredComments)-1].List[0].Text
tagstr = strings.TrimPrefix(tagstr, "//")
tl := strings.Split(strings.TrimSpace(tagstr), " ")
for _, ts := range tl {
tf := strings.Split(ts, ":")
if len(tf) != 2 {
continue
}
if tf[0] != "perm" { // todo: allow more tag types
continue
}
info.Methods[mname].Tags[tf[0]] = tf
}
}
}
}
}
/*jb, err := json.MarshalIndent(Infos, "", " ")
if err != nil {
return err
}
fmt.Println(string(jb))*/
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w, err := os.OpenFile(outfile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
if err != nil {
return err
}
err = doTemplate(w, m, `// Code generated by github.com/filecoin-project/lotus/gen/api. DO NOT EDIT.
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package {{.OutPkg}}
import (
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{{range .Imports}} {{.}}
{{end}}
)
`)
if err != nil {
return err
}
err = doTemplate(w, m, `
{{range .Infos}}
type {{.Name}}Struct struct {
{{range .Include}}
{{.}}Struct
{{end}}
Internal struct {
{{range .Methods}}
{{.Name}} func({{.NamedParams}}) ({{.Results}}) `+"`"+`{{range .Tags}}{{index . 0}}:"{{index . 1}}"{{end}}`+"`"+`
{{end}}
}
}
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type {{.Name}}Stub struct {
{{range .Include}}
{{.}}Stub
{{end}}
}
{{end}}
{{range .Infos}}
{{$name := .Name}}
{{range .Methods}}
func (s *{{$name}}Struct) {{.Name}}({{.NamedParams}}) ({{.Results}}) {
return s.Internal.{{.Name}}({{.ParamNames}})
}
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func (s *{{$name}}Stub) {{.Name}}({{.NamedParams}}) ({{.Results}}) {
return {{.DefRes}}xerrors.New("method not supported")
}
{{end}}
{{end}}
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{{range .Infos}}var _ {{.Name}} = new({{.Name}}Struct)
{{end}}
`)
return err
}
func doTemplate(w io.Writer, info interface{}, templ string) error {
t := template.Must(template.New("").
Funcs(template.FuncMap{}).Parse(templ))
return t.Execute(w, info)
}