github.com/cloudwego/kitex@v0.9.0/tool/internal_pkg/util/dump.go (about)

     1  // Copyright 2023 CloudWeGo 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 util
    16  
    17  import (
    18  	"io/ioutil"
    19  	"os"
    20  )
    21  
    22  // ReadInput defaults to read from stdin.
    23  // If `KITEX_TOOL_STDIN_LOAD_FILE` is a valid path, it reads from the specified file;
    24  // If `KITEX_TOOL_STDIN_DUMP_FILE` is a valid path, it dumps what it read to the file;
    25  // This feature makes it easier to debug kitex tool.
    26  func ReadInput() ([]byte, error) {
    27  	if dumpFileName := os.Getenv("KITEX_TOOL_STDIN_LOAD_FILE"); dumpFileName != "" {
    28  		return ioutil.ReadFile(dumpFileName)
    29  	}
    30  	data, err := ioutil.ReadAll(os.Stdin)
    31  	if err == nil {
    32  		if dumpFileName := os.Getenv("KITEX_TOOL_STDIN_DUMP_FILE"); dumpFileName != "" {
    33  			ioutil.WriteFile(dumpFileName, data, 0o644)
    34  		}
    35  	}
    36  	return data, err
    37  }