/
match.go
145 lines (127 loc) · 5.1 KB
/
match.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 remote
import (
"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/block"
"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"
"github.com/m3db/m3/src/x/instrument"
xhttp "github.com/m3db/m3/src/x/net/http"
"go.uber.org/zap"
)
const (
// PromSeriesMatchURL is the url for remote prom series matcher handler.
PromSeriesMatchURL = route.Prefix + "/series"
)
// PromSeriesMatchHTTPMethods are the HTTP methods for this handler.
var PromSeriesMatchHTTPMethods = []string{http.MethodGet, http.MethodPost}
// PromSeriesMatchHandler represents a handler for
// the prometheus series matcher endpoint.
type PromSeriesMatchHandler struct {
storage storage.Storage
tagOptions models.TagOptions
fetchOptionsBuilder handleroptions.FetchOptionsBuilder
instrumentOpts instrument.Options
parseOpts promql.ParseOptions
}
// NewPromSeriesMatchHandler returns a new instance of handler.
// TODO: Remove series match handler, not part of Prometheus HTTP API
// and not used anywhere or documented.
func NewPromSeriesMatchHandler(opts options.HandlerOptions) http.Handler {
return &PromSeriesMatchHandler{
tagOptions: opts.TagOptions(),
storage: opts.Storage(),
fetchOptionsBuilder: opts.FetchOptionsBuilder(),
instrumentOpts: opts.InstrumentOpts(),
parseOpts: opts.Engine().Options().ParseOptions().
SetRequireStartEndTime(opts.Config().Query.RequireSeriesEndpointStartEndTime),
}
}
func (h *PromSeriesMatchHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set(xhttp.HeaderContentType, xhttp.ContentTypeJSON)
w.Header().Set("Access-Control-Allow-Origin", "*")
ctx, opts, rErr := h.fetchOptionsBuilder.NewFetchOptions(r.Context(), r)
if rErr != nil {
xhttp.WriteError(w, rErr)
return
}
logger := logging.WithContext(ctx, h.instrumentOpts)
queries, err := prometheus.ParseSeriesMatchQuery(r, h.parseOpts, h.tagOptions)
if err != nil {
logger.Error("unable to parse series match values to query", zap.Error(err))
xhttp.WriteError(w, err)
return
}
results := make([]models.Metrics, len(queries))
meta := block.NewResultMetadata()
for i, query := range queries {
result, err := h.storage.SearchSeries(ctx, query, opts)
if err != nil {
logger.Error("unable to get matched series", zap.Error(err))
xhttp.WriteError(w, err)
return
}
results[i] = result.Metrics
meta = meta.CombineMetadata(result.Metadata)
}
err = handleroptions.AddDBResultResponseHeaders(w, meta, 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.RenderSeriesMatchResultsJSON(noopWriter, results, renderOpts)
if err != nil {
logger.Error("unable to render match series 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 returned data headers", zap.Error(err))
xhttp.WriteError(w, err)
return
}
// TODO: Support multiple result types
_, err = prometheus.RenderSeriesMatchResultsJSON(w, results, renderOpts)
if err != nil {
logger.Error("unable to render match series", zap.Error(err))
}
}