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list_tags.go
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/
list_tags.go
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// Copyright (c) 2019 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 (
"fmt"
"io/ioutil"
"net/http"
"github.com/m3db/m3/src/query/api/v1/handler/prometheus"
"github.com/m3db/m3/src/query/api/v1/handler/prometheus/handleroptions"
"github.com/m3db/m3/src/query/api/v1/options"
"github.com/m3db/m3/src/query/api/v1/route"
"github.com/m3db/m3/src/query/errors"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser/promql"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/util/logging"
xerrors "github.com/m3db/m3/src/x/errors"
"github.com/m3db/m3/src/x/instrument"
xhttp "github.com/m3db/m3/src/x/net/http"
xtime "github.com/m3db/m3/src/x/time"
"go.uber.org/zap"
)
const (
// ListTagsURL is the url for listing tags.
ListTagsURL = route.LabelNamesURL
)
// ListTagsHTTPMethods are the HTTP methods for this handler.
var ListTagsHTTPMethods = []string{http.MethodGet, http.MethodPost}
// ListTagsHandler represents a handler for list tags endpoint.
type ListTagsHandler struct {
storage storage.Storage
fetchOptionsBuilder handleroptions.FetchOptionsBuilder
parseOpts promql.ParseOptions
instrumentOpts instrument.Options
tagOpts models.TagOptions
}
// NewListTagsHandler returns a new instance of handler.
func NewListTagsHandler(opts options.HandlerOptions) http.Handler {
return &ListTagsHandler{
storage: opts.Storage(),
fetchOptionsBuilder: opts.FetchOptionsBuilder(),
parseOpts: promql.NewParseOptions().
SetRequireStartEndTime(opts.Config().Query.RequireLabelsEndpointStartEndTime).
SetNowFn(opts.NowFn()),
instrumentOpts: opts.InstrumentOpts(),
tagOpts: opts.TagOptions(),
}
}
func (h *ListTagsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set(xhttp.HeaderContentType, xhttp.ContentTypeJSON)
ctx, opts, rErr := h.fetchOptionsBuilder.NewFetchOptions(r.Context(), r)
if rErr != nil {
xhttp.WriteError(w, rErr)
return
}
start, end, err := prometheus.ParseStartAndEnd(r, h.parseOpts)
if err != nil {
xhttp.WriteError(w, err)
return
}
tagMatchers := models.Matchers{{Type: models.MatchAll}}
reqTagMatchers, ok, err := prometheus.ParseMatch(r, h.parseOpts, h.tagOpts)
if err != nil {
err = xerrors.NewInvalidParamsError(err)
xhttp.WriteError(w, err)
return
}
if ok {
if n := len(reqTagMatchers); n != 1 {
err = xerrors.NewInvalidParamsError(fmt.Errorf(
"only single tag matcher allowed: actual=%d", n))
xhttp.WriteError(w, err)
return
}
tagMatchers = reqTagMatchers[0].Matchers
}
query := &storage.CompleteTagsQuery{
CompleteNameOnly: true,
TagMatchers: tagMatchers,
Start: xtime.ToUnixNano(start),
End: xtime.ToUnixNano(end),
}
logger := logging.WithContext(ctx, h.instrumentOpts)
result, err := h.storage.CompleteTags(ctx, query, opts)
if err != nil {
logger.Error("unable to complete tags", zap.Error(err))
if errors.IsTimeout(err) {
err = errors.NewErrQueryTimeout(err)
}
xhttp.WriteError(w, err)
return
}
err = handleroptions.AddDBResultResponseHeaders(w, result.Metadata, opts)
if err != nil {
logger.Error("error writing database limit headers", zap.Error(err))
xhttp.WriteError(w, err)
return
}
// First write out results to zero output to check if will limit
// results and if so then write the header about truncation if occurred.
var (
noopWriter = ioutil.Discard
renderOpts = prometheus.RenderSeriesMetadataOptions{
ReturnedSeriesMetadataLimit: opts.ReturnedSeriesMetadataLimit,
}
)
renderResult, err := prometheus.RenderListTagResultsJSON(noopWriter, result, renderOpts)
if err != nil {
logger.Error("unable to render list tags results", zap.Error(err))
xhttp.WriteError(w, err)
return
}
limited := &handleroptions.ReturnedMetadataLimited{
Results: renderResult.Results,
TotalResults: renderResult.TotalResults,
Limited: renderResult.LimitedMaxReturnedData,
}
if err := handleroptions.AddReturnedLimitResponseHeaders(w, nil, limited); err != nil {
logger.Error("unable to write returned limit response headers", zap.Error(err))
xhttp.WriteError(w, err)
return
}
_, err = prometheus.RenderListTagResultsJSON(w, result, renderOpts)
if err != nil {
logger.Error("unable to render list tags results", zap.Error(err))
}
}