/
finder.go
149 lines (125 loc) · 3.26 KB
/
finder.go
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package service
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"io/fs"
"strconv"
"strings"
"github.com/chitoku-k/kubernetes-field-selector-extractor/domain"
"github.com/sirupsen/logrus"
)
var (
noop = func(fs.FileInfo) bool { return true }
)
type finderService struct {
dir string
}
type FinderService interface {
Do() ([]domain.FieldSelector, error)
}
func NewFinderService(dir string) FinderService {
return &finderService{
dir: dir,
}
}
func (f *finderService) Do() ([]domain.FieldSelector, error) {
var result []domain.FieldSelector
set := token.NewFileSet()
pkgs, err := parser.ParseDir(set, f.dir, noop, parser.Mode(0))
if err != nil {
return nil, fmt.Errorf("failed to parse: %w", err)
}
for name, pkg := range pkgs {
if strings.HasSuffix(name, "_test") {
continue
}
logrus.Debugf("Package: %q", pkg.Name)
for filename, file := range pkg.Files {
logrus.Debugf("| Filename: %q", filename)
ast.Inspect(file, func(node ast.Node) bool {
call, ok := node.(*ast.CallExpr)
if !ok {
return true
}
selectorExpr, ok := call.Fun.(*ast.SelectorExpr)
if !ok {
return true
}
if selectorExpr.Sel.Name != "AddFieldLabelConversionFunc" {
return false
}
if len(call.Args) != 2 {
logrus.Warnf("| | Invalid number of arguments passed to AddFieldLabelConversionFunc()")
return false
}
kindExpr, ok := call.Args[0].(*ast.CallExpr)
if !ok {
logrus.Warnf("| | Unexpected expression for gvk: %#v", call.Args[0])
return false
}
if len(kindExpr.Args) != 1 {
logrus.Warnf("| | Invalid number of arguments passed to WithKind()")
return false
}
var kind string
kindArg, ok := kindExpr.Args[0].(*ast.BasicLit)
if !ok {
logrus.Warnf("| | Unexpected expression for kind: %#v", kindExpr.Args[0])
kind = fmt.Sprintf("%#v", kindExpr.Args[0])
} else {
kind, err = strconv.Unquote(kindArg.Value)
if err != nil {
logrus.Warnf("| | Failed to unquote kind: %v", kindArg.Value)
return false
}
}
logrus.Debugf("| | Kind: %v", kind)
selector := domain.FieldSelector{
File: filename,
Kind: kind,
Labels: []string{},
}
funcExpr, ok := call.Args[1].(*ast.FuncLit)
if !ok {
logrus.Warnf("| | Unexpected expression for conversionFunc: %#v", call.Args[1])
return false
}
var foundSwitchExpr bool
for _, stmt := range funcExpr.Body.List {
switchExpr, ok := stmt.(*ast.SwitchStmt)
if !ok {
continue
}
foundSwitchExpr = true
for _, expr := range switchExpr.Body.List {
caseClause, ok := expr.(*ast.CaseClause)
if !ok {
continue
}
for _, caseExpr := range caseClause.List {
labelExpr, ok := caseExpr.(*ast.BasicLit)
if !ok {
continue
}
label, err := strconv.Unquote(labelExpr.Value)
if err != nil {
logrus.Warnf("| | | Failed to unquote: %v", labelExpr.Value)
continue
}
logrus.Debugf("| | | Found: %q", label)
selector.Labels = append(selector.Labels, label)
}
}
}
if !foundSwitchExpr {
logrus.Warnf("| | | Not found switch expr")
}
result = append(result, selector)
return false
})
}
}
return result, err
}