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read_instantaneous.go
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/
read_instantaneous.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/executor"
"github.com/m3db/m3/src/query/models"
"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 (
// PromReadInstantURL is the url for native instantaneous prom read
// handler, this matches the default URL for the query endpoint
// found on a Prometheus server
PromReadInstantURL = handler.RoutePrefixV1 + "/query"
// PromReadInstantHTTPMethod is the HTTP method used with this resource.
PromReadInstantHTTPMethod = http.MethodGet
)
// PromReadInstantHandler represents a handler for prometheus instantaneous read endpoint.
type PromReadInstantHandler struct {
engine executor.Engine
fetchOptionsBuilder handler.FetchOptionsBuilder
tagOpts models.TagOptions
timeoutOpts *prometheus.TimeoutOpts
instrumentOpts instrument.Options
}
// NewPromReadInstantHandler returns a new instance of handler.
func NewPromReadInstantHandler(
engine executor.Engine,
fetchOptionsBuilder handler.FetchOptionsBuilder,
tagOpts models.TagOptions,
timeoutOpts *prometheus.TimeoutOpts,
instrumentOpts instrument.Options,
) *PromReadInstantHandler {
return &PromReadInstantHandler{
engine: engine,
fetchOptionsBuilder: fetchOptionsBuilder,
tagOpts: tagOpts,
timeoutOpts: timeoutOpts,
instrumentOpts: instrumentOpts,
}
}
func (h *PromReadInstantHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := context.WithValue(r.Context(), handler.HeaderKey, r.Header)
logger := logging.WithContext(ctx, h.instrumentOpts)
fetchOpts, rErr := h.fetchOptionsBuilder.NewFetchOptions(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
params, rErr := parseInstantaneousParams(r, h.engine.Options(),
h.timeoutOpts, fetchOpts, h.instrumentOpts)
if rErr != nil {
xhttp.Error(w, rErr, rErr.Code())
return
}
if params.Debug {
logger.Info("request params", zap.Any("params", params))
}
queryOpts := &executor.QueryOptions{
QueryContextOptions: models.QueryContextOptions{
LimitMaxTimeseries: fetchOpts.Limit,
}}
if restrictOpts := fetchOpts.RestrictFetchOptions; restrictOpts != nil {
restrict := &models.RestrictFetchTypeQueryContextOptions{
MetricsType: uint(restrictOpts.MetricsType),
StoragePolicy: restrictOpts.StoragePolicy,
}
queryOpts.QueryContextOptions.RestrictFetchType = restrict
}
result, err := read(ctx, h.engine, queryOpts, fetchOpts, h.tagOpts, w, params, h.instrumentOpts)
if err != nil {
logger.Error("unable to fetch data", zap.Error(err))
xhttp.Error(w, err, http.StatusInternalServerError)
return
}
// TODO: Support multiple result types
w.Header().Set("Content-Type", "application/json")
renderResultsInstantaneousJSON(w, result)
}