summaryrefslogtreecommitdiffstats
path: root/cmd/binapi-generator/main.go
blob: b73a6993e41475e85db81ab57c982a847921afa4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
// 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 JSON file.")
	inputDir        = flag.String("input-dir", ".", "Input directory with JSON files.")
	outputDir       = flag.String("output-dir", ".", "Output directory where package folders will be generated.")
	includeAPIVer   = flag.Bool("include-apiver", false, "Whether to include VlAPIVersion in generated file.")
	debug           = flag.Bool("debug", false, "Turn on debug mode.")
	continueOnError = flag.Bool("continue-onerror", false, "Wheter to continue with next file on error.")
)

func init() {
	flag.Parse()
	if *debug {
		logrus.SetLevel(logrus.DebugLevel)
	}
}

func logf(f string, v ...interface{}) {
	if *debug {
		logrus.Debugf(f, v...)
	}
}

var log = logrus.Logger{
	Level:     logrus.InfoLevel,
	Formatter: &logrus.TextFormatter{},
	Out:       os.Stdout,
}

func main() {
	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
	}

	// 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
}