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complete_tags.go
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/
complete_tags.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 native
import (
"context"
"net/http"
"github.com/m3db/m3/src/query/api/v1/handler"
"github.com/m3db/m3/src/query/api/v1/handler/prometheus"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/util/logging"
"github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// CompleteTagsURL is the url for searching tags.
CompleteTagsURL = handler.RoutePrefixV1 + "/search"
// CompleteTagsHTTPMethod is the HTTP method used with this resource.
CompleteTagsHTTPMethod = http.MethodGet
)
// CompleteTagsHandler represents a handler for search tags endpoint.
type CompleteTagsHandler struct {
storage storage.Storage
fetchOptionsBuilder handler.FetchOptionsBuilder
}
// NewCompleteTagsHandler returns a new instance of handler.
func NewCompleteTagsHandler(
storage storage.Storage,
fetchOptionsBuilder handler.FetchOptionsBuilder,
) http.Handler {
return &CompleteTagsHandler{
storage: storage,
fetchOptionsBuilder: fetchOptionsBuilder,
}
}
func (h *CompleteTagsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := context.WithValue(r.Context(), handler.HeaderKey, r.Header)
logger := logging.WithContext(ctx)
w.Header().Set("Content-Type", "application/json")
query, rErr := prometheus.ParseTagCompletionParamsToQuery(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
opts, rErr := h.fetchOptionsBuilder.NewFetchOptions(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
result, err := h.storage.CompleteTags(ctx, query, opts)
if err != nil {
logger.Error("unable to complete tags", zap.Error(err))
xhttp.Error(w, err, http.StatusBadRequest)
return
}
// TODO: Support multiple result types
prometheus.RenderTagCompletionResultsJSON(w, result)
}