github.com/m3db/m3@v1.5.0/src/ctl/service/r2/io.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package r2
    22  
    23  import (
    24  	"encoding/json"
    25  	"fmt"
    26  	"io"
    27  	"net/http"
    28  	"reflect"
    29  	"strings"
    30  
    31  	"github.com/m3db/m3/src/metrics/rules/view/changes"
    32  
    33  	validator "gopkg.in/go-playground/validator.v9"
    34  )
    35  
    36  // TODO(dgromov): Make this return a list of validation errors
    37  func parseRequest(s interface{}, body io.ReadCloser) error {
    38  	if err := json.NewDecoder(body).Decode(s); err != nil {
    39  		return NewBadInputError(fmt.Sprintf("Malformed Json: %s", err.Error()))
    40  	}
    41  
    42  	// Invoking the validation explictely to have control over the format of the error output.
    43  	validate := validator.New()
    44  	validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
    45  		parts := strings.SplitN(fld.Tag.Get("json"), ",", 2)
    46  		if len(parts) > 0 {
    47  			return parts[0]
    48  		}
    49  		return fld.Name
    50  	})
    51  
    52  	var required []string
    53  	if err := validate.Struct(s); err != nil {
    54  		for _, e := range err.(validator.ValidationErrors) {
    55  			if e.ActualTag() == "required" {
    56  				required = append(required, e.Namespace())
    57  			}
    58  		}
    59  	}
    60  
    61  	if len(required) > 0 {
    62  		return NewBadInputError(fmt.Sprintf("Required: [%v]", strings.Join(required, ", ")))
    63  	}
    64  	return nil
    65  }
    66  
    67  func writeAPIResponse(w http.ResponseWriter, code int, msg string) error {
    68  	j, err := json.Marshal(apiResponse{Code: code, Message: msg})
    69  	if err != nil {
    70  		return err
    71  	}
    72  	return sendResponse(w, j, code)
    73  }
    74  
    75  func sendResponse(w http.ResponseWriter, data []byte, status int) error {
    76  	w.Header().Set("Content-Type", "application/json")
    77  	w.WriteHeader(status)
    78  	_, err := w.Write(data)
    79  	return err
    80  }
    81  
    82  type apiResponse struct {
    83  	Code    int    `json:"code"`
    84  	Message string `json:"message"`
    85  }
    86  
    87  type updateRuleSetRequest struct {
    88  	RuleSetChanges changes.RuleSetChanges `json:"rulesetChanges"`
    89  	RuleSetVersion int                    `json:"rulesetVersion"`
    90  }