go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/web/rpcexplorer/src/data/testdata/gen.go (about)

     1  // Copyright 2023 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  // This file generates descriptor.ts. Run itself:
    18  //go:generate go run gen.go
    19  
    20  import (
    21  	"fmt"
    22  	"io"
    23  	"io/ioutil"
    24  	"os"
    25  	"os/exec"
    26  
    27  	"google.golang.org/protobuf/encoding/protojson"
    28  	"google.golang.org/protobuf/proto"
    29  	"google.golang.org/protobuf/types/descriptorpb"
    30  )
    31  
    32  func run() error {
    33  	descFile, err := ioutil.TempFile("", "desc")
    34  	if err != nil {
    35  		return err
    36  	}
    37  
    38  	protoc := exec.Command(
    39  		"protoc",
    40  		"--descriptor_set_out="+descFile.Name(),
    41  		"--include_source_info",
    42  		"types.proto")
    43  	protoc.Stdout = os.Stdout
    44  	protoc.Stderr = os.Stderr
    45  	if err := protoc.Run(); err != nil {
    46  		return fmt.Errorf("protoc: %s", err)
    47  	}
    48  
    49  	descBytes, err := io.ReadAll(descFile)
    50  	if err != nil {
    51  		return err
    52  	}
    53  	if len(descBytes) == 0 {
    54  		return fmt.Errorf("desc file was read as empty")
    55  	}
    56  
    57  	desc := &descriptorpb.FileDescriptorSet{}
    58  	if err := proto.Unmarshal(descBytes, desc); err != nil {
    59  		return fmt.Errorf("could not read descriptor file: %s", err)
    60  	}
    61  
    62  	m := protojson.MarshalOptions{Multiline: true, Indent: "  "}
    63  	blob, err := m.Marshal(desc)
    64  	if err != nil {
    65  		return err
    66  	}
    67  
    68  	out, err := os.Create("descriptor.ts")
    69  	if err != nil {
    70  		return err
    71  	}
    72  	_, err = fmt.Fprintf(out, `// Copyright 2023 The LUCI Authors.
    73  //
    74  // Licensed under the Apache License, Version 2.0 (the "License");
    75  // you may not use this file except in compliance with the License.
    76  // You may obtain a copy of the License at
    77  //
    78  //      http://www.apache.org/licenses/LICENSE-2.0
    79  //
    80  // Unless required by applicable law or agreed to in writing, software
    81  // distributed under the License is distributed on an "AS IS" BASIS,
    82  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    83  // See the License for the specific language governing permissions and
    84  // limitations under the License.
    85  
    86  // This file is generated by gen.go.
    87  // To update run "go generate .".
    88  
    89  export const TestDescriptor = %s;
    90  
    91  export default TestDescriptor;
    92  `, blob)
    93  	return err
    94  }
    95  
    96  func main() {
    97  	if err := run(); err != nil {
    98  		fmt.Fprintln(os.Stderr, err)
    99  		os.Exit(1)
   100  	}
   101  }