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search.go
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search.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 handler
import (
"context"
"encoding/json"
"io/ioutil"
"net/http"
"strconv"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/util/logging"
xhttp "github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// SearchURL is the url to search for metric ids
SearchURL = "/search"
// SearchHTTPMethod is the HTTP method used with this resource.
SearchHTTPMethod = http.MethodPost
defaultLimit = 1000
)
// SearchHandler represents a handler for the search endpoint
type SearchHandler struct {
store storage.Storage
fetchOptionsBuilder FetchOptionsBuilder
}
// NewSearchHandler returns a new instance of handler
func NewSearchHandler(
storage storage.Storage,
fetchOptionsBuilder FetchOptionsBuilder,
) http.Handler {
return &SearchHandler{
store: storage,
fetchOptionsBuilder: fetchOptionsBuilder,
}
}
func (h *SearchHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
logger := logging.WithContext(r.Context())
query, parseBodyErr := h.parseBody(r)
opts, parseURLParamsErr := h.parseURLParams(r)
if err := firstParseError(parseBodyErr, parseURLParamsErr); err != nil {
logger.Error("unable to parse request", zap.Error(err.Inner()))
xhttp.Error(w, err.Inner(), err.Code())
return
}
results, err := h.search(r.Context(), query, opts)
if err != nil {
logger.Error("unable to fetch data", zap.Error(err))
xhttp.Error(w, err, http.StatusBadRequest)
return
}
xhttp.WriteJSONResponse(w, results, logger)
}
func (h *SearchHandler) parseBody(r *http.Request) (*storage.FetchQuery, *xhttp.ParseError) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, xhttp.NewParseError(err, http.StatusBadRequest)
}
defer r.Body.Close()
var fetchQuery storage.FetchQuery
if err := json.Unmarshal(body, &fetchQuery); err != nil {
return nil, xhttp.NewParseError(err, http.StatusBadRequest)
}
return &fetchQuery, nil
}
func (h *SearchHandler) parseURLParams(r *http.Request) (*storage.FetchOptions, *xhttp.ParseError) {
fetchOpts, parseErr := h.fetchOptionsBuilder.NewFetchOptions(r)
if parseErr != nil {
return nil, parseErr
}
if str := r.URL.Query().Get("limit"); str != "" {
var err error
fetchOpts.Limit, err = strconv.Atoi(str)
if err != nil {
return nil, xhttp.NewParseError(err, http.StatusBadRequest)
}
}
return fetchOpts, nil
}
func (h *SearchHandler) search(
ctx context.Context,
query *storage.FetchQuery,
opts *storage.FetchOptions,
) (*storage.SearchResults, error) {
return h.store.SearchSeries(ctx, query, opts)
}
func firstParseError(errs ...*xhttp.ParseError) *xhttp.ParseError {
for _, err := range errs {
if err != nil {
return err
}
}
return nil
}