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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"
"io/ioutil"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"github.com/sirupsen/logrus"
"go.fd.io/govpp/binapigen/vppapi"
)
type Options struct {
OutputDir string // output directory for generated files
ImportPrefix string // prefix for import paths
NoVersionInfo bool // disables generating version info
NoSourcePathInfo bool // disables the 'source: /path' comment
}
func Run(apiDir string, filesToGenerate []string, opts Options, f func(*Generator) error) {
if err := run(apiDir, filesToGenerate, opts, f); err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", filepath.Base(os.Args[0]), err)
os.Exit(1)
}
}
func run(apiDir string, filesToGenerate []string, opts Options, fn func(*Generator) error) error {
apiFiles, err := vppapi.ParseDir(apiDir)
if err != nil {
return err
}
if opts.ImportPrefix == "" {
opts.ImportPrefix, err = resolveImportPath(opts.OutputDir)
if err != nil {
return fmt.Errorf("cannot resolve import path for output dir %s: %w", opts.OutputDir, err)
}
logrus.Debugf("resolved import path prefix: %s", opts.ImportPrefix)
}
gen, err := New(opts, apiFiles, filesToGenerate)
if err != nil {
return err
}
gen.vppVersion = vppapi.ResolveVPPVersion(apiDir)
if gen.vppVersion == "" {
gen.vppVersion = "unknown"
}
if fn == nil {
GenerateDefault(gen)
} else {
if err := fn(gen); err != nil {
return err
}
}
if err = gen.Generate(); err != nil {
return err
}
return nil
}
func GenerateDefault(gen *Generator) {
for _, file := range gen.Files {
if !file.Generate {
continue
}
GenerateAPI(gen, file)
GenerateRPC(gen, file)
}
}
var Logger = logrus.New()
func init() {
if debug := os.Getenv("DEBUG_GOVPP"); strings.Contains(debug, "binapigen") {
Logger.SetLevel(logrus.DebugLevel)
logrus.SetLevel(logrus.DebugLevel)
}
}
func logf(f string, v ...interface{}) {
Logger.Debugf(f, v...)
}
// resolveImportPath tries to resolve import path for a directory.
func resolveImportPath(dir string) (string, error) {
absPath, err := filepath.Abs(dir)
if err != nil {
return "", err
}
modRoot := findGoModuleRoot(absPath)
if modRoot == "" {
return "", err
}
modPath, err := readModulePath(path.Join(modRoot, "go.mod"))
if err != nil {
return "", err
}
relDir, err := filepath.Rel(modRoot, absPath)
if err != nil {
return "", err
}
return filepath.Join(modPath, relDir), nil
}
// findGoModuleRoot looks for enclosing Go module.
func findGoModuleRoot(dir string) (root string) {
dir = filepath.Clean(dir)
for {
if fi, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil && !fi.IsDir() {
return dir
}
d := filepath.Dir(dir)
if d == dir {
break
}
dir = d
}
return ""
}
var modulePathRE = regexp.MustCompile(`module[ \t]+([^ \t\r\n]+)`)
// readModulePath reads module path from go.mod file.
func readModulePath(gomod string) (string, error) {
data, err := ioutil.ReadFile(gomod)
if err != nil {
return "", err
}
m := modulePathRE.FindSubmatch(data)
if m == nil {
return "", err
}
return string(m[1]), nil
}
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