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bee/autorouter.go

282 lines
6.9 KiB

// Copyright 2013 bee authors
//
// 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 main
import (
"bytes"
"errors"
"fmt"
"go/ast"
gobuild "go/build"
"go/doc"
"go/parser"
"go/token"
"io"
"io/ioutil"
"os"
"path"
"runtime"
"strings"
"time"
)
var cmdRouter = &Command{
UsageLine: "router",
Short: "auto-generate routers for the app controllers",
Long: `
`,
}
func init() {
cmdRouter.Run = autoRouter
}
func autoRouter(cmd *Command, args []string) {
fmt.Println("[INFO] Starting auto-generating routers...")
}
// getControllerInfo returns controllers that embeded "beego.controller"
// and their methods of package in given path.
func getControllerInfo(path string) (map[string][]string, error) {
now := time.Now()
path = strings.TrimSuffix(path, "/")
dir, err := os.Open(path)
if err != nil {
return nil, err
}
fis, err := dir.Readdir(0)
if err != nil {
return nil, err
}
files := make([]*source, 0, len(fis))
for _, fi := range fis {
// Only load go files.
if strings.HasSuffix(fi.Name(), ".go") {
f, err := os.Open(path + "/" + fi.Name())
if err != nil {
return nil, err
}
p := make([]byte, fi.Size())
_, err = f.Read(p)
if err != nil {
return nil, err
}
f.Close()
files = append(files, &source{
name: path + "/" + fi.Name(),
data: p,
})
}
}
rw := &routerWalker{
pdoc: &Package{
ImportPath: path,
},
}
cm := make(map[string][]string)
pdoc, err := rw.build(files)
for _, t := range pdoc.Types {
// Check if embeded "beego.Controller".
if strings.Index(t.Decl, "beego.Controller") > -1 {
for _, f := range t.Methods {
cm[t.Name] = append(cm[t.Name], f.Name)
}
}
}
fmt.Println(time.Since(now))
return cm, nil
}
// A source describles a source code file.
type source struct {
name string
data []byte
}
func (s *source) Name() string { return s.name }
func (s *source) Size() int64 { return int64(len(s.data)) }
func (s *source) Mode() os.FileMode { return 0 }
func (s *source) ModTime() time.Time { return time.Time{} }
func (s *source) IsDir() bool { return false }
func (s *source) Sys() interface{} { return nil }
// A routerWalker holds the state used when building the documentation.
type routerWalker struct {
pdoc *Package
srcs map[string]*source // Source files.
fset *token.FileSet
buf []byte // scratch space for printNode method.
}
// Package represents full information and documentation for a package.
type Package struct {
ImportPath string
// Top-level declarations.
Types []*Type
}
// Type represents structs and interfaces.
type Type struct {
Name string // Type name.
Decl string
Methods []*Func // Exported methods.
}
// Func represents functions
type Func struct {
Name string
}
// build generates data from source files.
func (w *routerWalker) build(srcs []*source) (*Package, error) {
// Add source files to walker, I skipped references here.
w.srcs = make(map[string]*source)
for _, src := range srcs {
w.srcs[src.name] = src
}
w.fset = token.NewFileSet()
// Find the package and associated files.
ctxt := gobuild.Context{
GOOS: runtime.GOOS,
GOARCH: runtime.GOARCH,
CgoEnabled: true,
JoinPath: path.Join,
IsAbsPath: path.IsAbs,
SplitPathList: func(list string) []string { return strings.Split(list, ":") },
IsDir: func(path string) bool { panic("unexpected") },
HasSubdir: func(root, dir string) (rel string, ok bool) { panic("unexpected") },
ReadDir: func(dir string) (fi []os.FileInfo, err error) { return w.readDir(dir) },
OpenFile: func(path string) (r io.ReadCloser, err error) { return w.openFile(path) },
Compiler: "gc",
}
bpkg, err := ctxt.ImportDir(w.pdoc.ImportPath, 0)
// Continue if there are no Go source files; we still want the directory info.
_, nogo := err.(*gobuild.NoGoError)
if err != nil {
if nogo {
err = nil
} else {
return nil, errors.New("routerWalker.build -> " + err.Error())
}
}
// Parse the Go files
files := make(map[string]*ast.File)
for _, name := range append(bpkg.GoFiles, bpkg.CgoFiles...) {
file, err := parser.ParseFile(w.fset, name, w.srcs[name].data, parser.ParseComments)
if err != nil {
return nil, errors.New("routerWalker.build -> parse go files: " + err.Error())
}
files[name] = file
}
apkg, _ := ast.NewPackage(w.fset, files, simpleImporter, nil)
mode := doc.Mode(0)
if w.pdoc.ImportPath == "builtin" {
mode |= doc.AllDecls
}
pdoc := doc.New(apkg, w.pdoc.ImportPath, mode)
w.pdoc.Types = w.types(pdoc.Types)
return w.pdoc, err
}
func (w *routerWalker) funcs(fdocs []*doc.Func) []*Func {
var result []*Func
for _, d := range fdocs {
result = append(result, &Func{
Name: d.Name,
})
}
return result
}
func (w *routerWalker) types(tdocs []*doc.Type) []*Type {
var result []*Type
for _, d := range tdocs {
result = append(result, &Type{
Decl: w.printDecl(d.Decl),
Name: d.Name,
Methods: w.funcs(d.Methods),
})
}
return result
}
func (w *routerWalker) printDecl(decl ast.Node) string {
var d Code
d, w.buf = printDecl(decl, w.fset, w.buf)
return d.Text
}
func (w *routerWalker) readDir(dir string) ([]os.FileInfo, error) {
if dir != w.pdoc.ImportPath {
panic("unexpected")
}
fis := make([]os.FileInfo, 0, len(w.srcs))
for _, src := range w.srcs {
fis = append(fis, src)
}
return fis, nil
}
func (w *routerWalker) openFile(path string) (io.ReadCloser, error) {
if strings.HasPrefix(path, w.pdoc.ImportPath+"/") {
if src, ok := w.srcs[path[len(w.pdoc.ImportPath)+1:]]; ok {
return ioutil.NopCloser(bytes.NewReader(src.data)), nil
}
}
panic("unexpected")
}
func simpleImporter(imports map[string]*ast.Object, path string) (*ast.Object, error) {
pkg := imports[path]
if pkg == nil {
// Guess the package name without importing it. Start with the last
// element of the path.
name := path[strings.LastIndex(path, "/")+1:]
// Trim commonly used prefixes and suffixes containing illegal name
// runes.
name = strings.TrimSuffix(name, ".go")
name = strings.TrimSuffix(name, "-go")
name = strings.TrimPrefix(name, "go.")
name = strings.TrimPrefix(name, "go-")
name = strings.TrimPrefix(name, "biogo.")
// It's also common for the last element of the path to contain an
// extra "go" prefix, but not always. TODO: examine unresolved ids to
// detect when trimming the "go" prefix is appropriate.
pkg = ast.NewObj(ast.Pkg, name)
pkg.Data = ast.NewScope(nil)
imports[path] = pkg
}
return pkg, nil
}