121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// +build ignore
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package main
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import (
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"bufio"
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"bytes"
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"flag"
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"fmt"
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"go/format"
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"io/ioutil"
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"os"
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"strings"
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"github.com/elastic/beats/libbeat/asset"
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"github.com/elastic/beats/licenses"
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)
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var (
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pkg string
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input string
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output string
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name string
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license = "ASL2"
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)
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func init() {
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flag.StringVar(&pkg, "pkg", "", "Package name")
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flag.StringVar(&input, "in", "-", "Source of input. \"-\" means reading from stdin")
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flag.StringVar(&output, "out", "-", "Output path. \"-\" means writing to stdout")
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flag.StringVar(&license, "license", "ASL2", "License header for generated file.")
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flag.StringVar(&name, "name", "", "Asset name")
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}
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func main() {
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flag.Parse()
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args := flag.Args()
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var (
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file, beatName string
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data []byte
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err error
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)
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if input == "-" {
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if len(args) != 2 {
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fmt.Fprintln(os.Stderr, "File path must be set")
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os.Exit(1)
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}
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file = args[0]
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beatName = args[1]
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r := bufio.NewReader(os.Stdin)
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data, err = ioutil.ReadAll(r)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error while reading from stdin: %v\n", err)
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os.Exit(1)
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}
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} else {
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file = input
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beatName = args[0]
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data, err = ioutil.ReadFile(input)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Invalid file path: %s\n", input)
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os.Exit(1)
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}
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}
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// Depending on OS or tools configuration, files can contain carriages (\r),
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// what leads to different results, remove them before encoding.
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encData, err := asset.EncodeData(strings.Replace(string(data), "\r", "", -1))
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error encoding the data: %s\n", err)
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os.Exit(1)
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}
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licenseHeader, err := licenses.Find(license)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Invalid license: %s\n", err)
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os.Exit(1)
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}
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var buf bytes.Buffer
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if name == "" {
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name = file
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}
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asset.Template.Execute(&buf, asset.Data{
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Beat: beatName,
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Name: name,
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Data: encData,
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License: licenseHeader,
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Package: pkg,
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})
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bs, err := format.Source(buf.Bytes())
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if err != nil {
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panic(err)
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}
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if output == "-" {
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os.Stdout.Write(bs)
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} else {
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ioutil.WriteFile(output, bs, 0640)
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}
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}
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