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io.go
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io.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package r2
import (
"encoding/json"
"fmt"
"io"
"net/http"
"reflect"
"strings"
"github.com/m3db/m3/src/metrics/rules/view/changes"
validator "gopkg.in/go-playground/validator.v9"
)
// TODO(dgromov): Make this return a list of validation errors
func parseRequest(s interface{}, body io.ReadCloser) error {
if err := json.NewDecoder(body).Decode(s); err != nil {
return NewBadInputError(fmt.Sprintf("Malformed Json: %s", err.Error()))
}
// Invoking the validation explictely to have control over the format of the error output.
validate := validator.New()
validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
parts := strings.SplitN(fld.Tag.Get("json"), ",", 2)
if len(parts) > 0 {
return parts[0]
}
return fld.Name
})
var required []string
if err := validate.Struct(s); err != nil {
for _, e := range err.(validator.ValidationErrors) {
if e.ActualTag() == "required" {
required = append(required, e.Namespace())
}
}
}
if len(required) > 0 {
return NewBadInputError(fmt.Sprintf("Required: [%v]", strings.Join(required, ", ")))
}
return nil
}
func writeAPIResponse(w http.ResponseWriter, code int, msg string) error {
j, err := json.Marshal(apiResponse{Code: code, Message: msg})
if err != nil {
return err
}
return sendResponse(w, j, code)
}
func sendResponse(w http.ResponseWriter, data []byte, status int) error {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
_, err := w.Write(data)
return err
}
type apiResponse struct {
Code int `json:"code"`
Message string `json:"message"`
}
type updateRuleSetRequest struct {
RuleSetChanges changes.RuleSetChanges `json:"rulesetChanges"`
RuleSetVersion int `json:"rulesetVersion"`
}