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write.go
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write.go
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// Copyright (c) 2018 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 json
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/m3db/m3/src/query/api/v1/handler"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/ts"
"github.com/m3db/m3/src/query/util"
"github.com/m3db/m3/src/query/util/logging"
"github.com/m3db/m3/src/x/net/http"
xtime "github.com/m3db/m3x/time"
"go.uber.org/zap"
)
const (
// WriteJSONURL is the url for the write json handler
WriteJSONURL = handler.RoutePrefixV1 + "/json/write"
// JSONWriteHTTPMethod is the HTTP method used with this resource.
JSONWriteHTTPMethod = http.MethodPost
)
// WriteJSONHandler represents a handler for the write json endpoint
type WriteJSONHandler struct {
store storage.Storage
}
// NewWriteJSONHandler returns a new instance of handler.
func NewWriteJSONHandler(store storage.Storage) http.Handler {
return &WriteJSONHandler{
store: store,
}
}
// WriteQuery represents the write request from the user
// NB(braskin): support only writing one datapoint for now
// TODO: build this out to be a legitimate batched endpoint, change
// Tags to take a list of tag structs
type WriteQuery struct {
Tags map[string]string `json:"tags" validate:"nonzero"`
Timestamp string `json:"timestamp" validate:"nonzero"`
Value float64 `json:"value" validate:"nonzero"`
}
func (h *WriteJSONHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
req, rErr := h.parseRequest(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
writeQuery, err := newStorageWriteQuery(req)
if err != nil {
logging.WithContext(r.Context()).Error("Parsing error", zap.Any("err", err))
xhttp.Error(w, err, http.StatusInternalServerError)
}
if err := h.store.Write(r.Context(), writeQuery); err != nil {
logging.WithContext(r.Context()).Error("Write error", zap.Any("err", err))
xhttp.Error(w, err, http.StatusInternalServerError)
}
}
func newStorageWriteQuery(req *WriteQuery) (*storage.WriteQuery, error) {
parsedTime, err := util.ParseTimeString(req.Timestamp)
if err != nil {
return nil, err
}
tags := models.NewTags(len(req.Tags), nil)
for n, v := range req.Tags {
tags = tags.AddTag(models.Tag{Name: []byte(n), Value: []byte(v)})
}
return &storage.WriteQuery{
Tags: tags,
Datapoints: ts.Datapoints{
{
Timestamp: parsedTime,
Value: req.Value,
},
},
Unit: xtime.Millisecond,
Annotation: nil,
}, nil
}
func (h *WriteJSONHandler) parseRequest(r *http.Request) (*WriteQuery, *xhttp.ParseError) {
body := r.Body
if r.Body == nil {
err := fmt.Errorf("empty request body")
return nil, xhttp.NewParseError(err, http.StatusBadRequest)
}
defer body.Close()
js, err := ioutil.ReadAll(body)
if err != nil {
return nil, xhttp.NewParseError(err, http.StatusInternalServerError)
}
var writeQuery *WriteQuery
if err = json.Unmarshal(js, &writeQuery); err != nil {
return nil, xhttp.NewParseError(err, http.StatusBadRequest)
}
return writeQuery, nil
}