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// Copyright (c) 2018 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 main
import (
"bufio"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/bennyscetbun/jsongo"
"github.com/sirupsen/logrus"
)
var (
inputFile = flag.String("input-file", "", "Input file with VPP API in JSON format.")
inputDir = flag.String("input-dir", ".", "Input directory with VPP API files in JSON format.")
outputDir = flag.String("output-dir", ".", "Output directory where package folders will be generated.")
includeAPIVer = flag.Bool("include-apiver", false, "Include APIVersion constant for each module.")
includeComments = flag.Bool("include-comments", false, "Include JSON API source in comments for each object.")
continueOnError = flag.Bool("continue-onerror", false, "Continue with next file on error.")
debug = flag.Bool("debug", false, "Enable debug mode.")
)
var log = logrus.Logger{
Level: logrus.InfoLevel,
Formatter: &logrus.TextFormatter{},
Out: os.Stdout,
}
func main() {
flag.Parse()
if *debug {
logrus.SetLevel(logrus.DebugLevel)
}
if *inputFile == "" && *inputDir == "" {
fmt.Fprintln(os.Stderr, "ERROR: input-file or input-dir must be specified")
os.Exit(1)
}
if *inputFile != "" {
// process one input file
if err := generateFromFile(*inputFile, *outputDir); err != nil {
fmt.Fprintf(os.Stderr, "ERROR: code generation from %s failed: %v\n", *inputFile, err)
os.Exit(1)
}
} else {
// process all files in specified directory
files, err := getInputFiles(*inputDir)
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: code generation failed: %v\n", err)
os.Exit(1)
}
for _, file := range files {
if err := generateFromFile(file, *outputDir); err != nil {
fmt.Fprintf(os.Stderr, "ERROR: code generation from %s failed: %v\n", file, err)
if *continueOnError {
continue
}
os.Exit(1)
}
}
}
}
// getInputFiles returns all input files located in specified directory
func getInputFiles(inputDir string) (res []string, err error) {
files, err := ioutil.ReadDir(inputDir)
if err != nil {
return nil, fmt.Errorf("reading directory %s failed: %v", inputDir, err)
}
for _, f := range files {
if strings.HasSuffix(f.Name(), inputFileExt) {
res = append(res, filepath.Join(inputDir, f.Name()))
}
}
return res, nil
}
// generateFromFile generates Go package from one input JSON file
func generateFromFile(inputFile, outputDir string) error {
logf("generating from file: %q", inputFile)
defer logf("--------------------------------------")
ctx, err := getContext(inputFile, outputDir)
if err != nil {
return err
}
ctx.includeAPIVersionCrc = *includeAPIVer
ctx.includeComments = *includeComments
// read input file contents
ctx.inputData, err = readFile(inputFile)
if err != nil {
return err
}
// parse JSON data into objects
jsonRoot, err := parseJSON(ctx.inputData)
if err != nil {
return err
}
ctx.packageData, err = parsePackage(ctx, jsonRoot)
if err != nil {
return err
}
// create output directory
packageDir := filepath.Dir(ctx.outputFile)
if err := os.MkdirAll(packageDir, 0777); err != nil {
return fmt.Errorf("creating output directory %q failed: %v", packageDir, err)
}
// open output file
f, err := os.Create(ctx.outputFile)
if err != nil {
return fmt.Errorf("creating output file %q failed: %v", ctx.outputFile, err)
}
defer f.Close()
// generate Go package code
w := bufio.NewWriter(f)
if err := generatePackage(ctx, w); err != nil {
return err
}
// go format the output file (fail probably means the output is not compilable)
cmd := exec.Command("gofmt", "-w", ctx.outputFile)
if output, err := cmd.CombinedOutput(); err != nil {
return fmt.Errorf("gofmt failed: %v\n%s", err, string(output))
}
// count number of lines in generated output file
cmd = exec.Command("wc", "-l", ctx.outputFile)
if output, err := cmd.CombinedOutput(); err != nil {
log.Warnf("wc command failed: %v\n%s", err, string(output))
} else {
logf("generated lines: %s", output)
}
return nil
}
// readFile reads content of a file into memory
func readFile(inputFile string) ([]byte, error) {
inputData, err := ioutil.ReadFile(inputFile)
if err != nil {
return nil, fmt.Errorf("reading data from file failed: %v", err)
}
return inputData, nil
}
// parseJSON parses a JSON data into an in-memory tree
func parseJSON(inputData []byte) (*jsongo.JSONNode, error) {
root := jsongo.JSONNode{}
if err := json.Unmarshal(inputData, &root); err != nil {
return nil, fmt.Errorf("unmarshalling JSON failed: %v", err)
}
return &root, nil
}
func logf(f string, v ...interface{}) {
if *debug {
logrus.Debugf(f, v...)
}
}
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