1// Go support for Protocol Buffers - Google's data interchange format
2//
3// Copyright 2010 The Go Authors.  All rights reserved.
4// https://github.com/golang/protobuf
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met:
9//
10//     * Redistributions of source code must retain the above copyright
11// notice, this list of conditions and the following disclaimer.
12//     * Redistributions in binary form must reproduce the above
13// copyright notice, this list of conditions and the following disclaimer
14// in the documentation and/or other materials provided with the
15// distribution.
16//     * Neither the name of Google Inc. nor the names of its
17// contributors may be used to endorse or promote products derived from
18// this software without specific prior written permission.
19//
20// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31
32// protoc-gen-go is a plugin for the Google protocol buffer compiler to generate
33// Go code.  Run it by building this program and putting it in your path with
34// the name
35// 	protoc-gen-go
36// That word 'go' at the end becomes part of the option string set for the
37// protocol compiler, so once the protocol compiler (protoc) is installed
38// you can run
39// 	protoc --go_out=output_directory input_directory/file.proto
40// to generate Go bindings for the protocol defined by file.proto.
41// With that input, the output will be written to
42// 	output_directory/file.pb.go
43//
44// The generated code is documented in the package comment for
45// the library.
46//
47// See the README and documentation for protocol buffers to learn more:
48// 	https://developers.google.com/protocol-buffers/
49package main
50
51import (
52	"io/ioutil"
53	"os"
54
55	"github.com/golang/protobuf/proto"
56	"github.com/golang/protobuf/protoc-gen-go/generator"
57)
58
59func main() {
60	// Begin by allocating a generator. The request and response structures are stored there
61	// so we can do error handling easily - the response structure contains the field to
62	// report failure.
63	g := generator.New()
64
65	data, err := ioutil.ReadAll(os.Stdin)
66	if err != nil {
67		g.Error(err, "reading input")
68	}
69
70	if err := proto.Unmarshal(data, g.Request); err != nil {
71		g.Error(err, "parsing input proto")
72	}
73
74	if len(g.Request.FileToGenerate) == 0 {
75		g.Fail("no files to generate")
76	}
77
78	g.CommandLineParameters(g.Request.GetParameter())
79
80	// Create a wrapped version of the Descriptors and EnumDescriptors that
81	// point to the file that defines them.
82	g.WrapTypes()
83
84	g.SetPackageNames()
85	g.BuildTypeNameMap()
86
87	g.GenerateAllFiles()
88
89	// Send back the results.
90	data, err = proto.Marshal(g.Response)
91	if err != nil {
92		g.Error(err, "failed to marshal output proto")
93	}
94	_, err = os.Stdout.Write(data)
95	if err != nil {
96		g.Error(err, "failed to write output proto")
97	}
98}
99