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read.go
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read.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"
"fmt"
"net/http"
"github.com/m3db/m3/src/cmd/services/m3query/config"
"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/block"
"github.com/m3db/m3/src/query/executor"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/storage"
"github.com/m3db/m3/src/query/ts"
"github.com/m3db/m3/src/query/util/logging"
"github.com/m3db/m3/src/x/instrument"
xhttp "github.com/m3db/m3/src/x/net/http"
xopentracing "github.com/m3db/m3/src/x/opentracing"
opentracingext "github.com/opentracing/opentracing-go/ext"
opentracinglog "github.com/opentracing/opentracing-go/log"
"github.com/uber-go/tally"
"go.uber.org/zap"
)
const (
// PromReadURL is the url for native prom read handler, this matches the
// default URL for the query range endpoint found on a Prometheus server
PromReadURL = handler.RoutePrefixV1 + "/query_range"
// PromReadHTTPMethod is the HTTP method used with this resource.
PromReadHTTPMethod = http.MethodGet
// TODO: Move to config
initialBlockAlloc = 10
)
var (
emptySeriesList = []*ts.Series{}
emptyReqParams = models.RequestParams{}
)
// PromReadHandler represents a handler for prometheus read endpoint.
type PromReadHandler struct {
engine executor.Engine
fetchOptionsBuilder handler.FetchOptionsBuilder
tagOpts models.TagOptions
limitsCfg *config.LimitsConfiguration
promReadMetrics promReadMetrics
timeoutOps *prometheus.TimeoutOpts
keepNans bool
instrumentOpts instrument.Options
}
type promReadMetrics struct {
fetchSuccess tally.Counter
fetchErrorsServer tally.Counter
fetchErrorsClient tally.Counter
fetchTimerSuccess tally.Timer
maxDatapoints tally.Gauge
}
func newPromReadMetrics(scope tally.Scope) promReadMetrics {
return promReadMetrics{
fetchSuccess: scope.Counter("fetch.success"),
fetchErrorsServer: scope.Tagged(map[string]string{"code": "5XX"}).Counter("fetch.errors"),
fetchErrorsClient: scope.Tagged(map[string]string{"code": "4XX"}).Counter("fetch.errors"),
fetchTimerSuccess: scope.Timer("fetch.success.latency"),
maxDatapoints: scope.Gauge("max_datapoints"),
}
}
// ReadResponse is the response that gets returned to the user
type ReadResponse struct {
Results []ts.Series `json:"results,omitempty"`
}
type blockWithMeta struct {
block block.Block
meta block.Metadata
}
// RespError wraps error and status code
type RespError struct {
Err error
Code int
}
// NewPromReadHandler returns a new instance of handler.
func NewPromReadHandler(
engine executor.Engine,
fetchOptionsBuilder handler.FetchOptionsBuilder,
tagOpts models.TagOptions,
limitsCfg *config.LimitsConfiguration,
timeoutOpts *prometheus.TimeoutOpts,
keepNans bool,
instrumentOpts instrument.Options,
) *PromReadHandler {
h := &PromReadHandler{
engine: engine,
fetchOptionsBuilder: fetchOptionsBuilder,
tagOpts: tagOpts,
limitsCfg: limitsCfg,
promReadMetrics: newPromReadMetrics(instrumentOpts.MetricsScope()),
timeoutOps: timeoutOpts,
keepNans: keepNans,
instrumentOpts: instrumentOpts,
}
h.promReadMetrics.maxDatapoints.Update(float64(limitsCfg.MaxComputedDatapoints()))
return h
}
func (h *PromReadHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
timer := h.promReadMetrics.fetchTimerSuccess.Start()
fetchOpts, rErr := h.fetchOptionsBuilder.NewFetchOptions(r)
if rErr != nil {
xhttp.Error(w, rErr.Inner(), rErr.Code())
return
}
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, params, respErr := h.ServeHTTPWithEngine(w, r, h.engine, queryOpts, fetchOpts)
if respErr != nil {
xhttp.Error(w, respErr.Err, respErr.Code)
return
}
w.Header().Set("Content-Type", "application/json")
if params.FormatType == models.FormatM3QL {
renderM3QLResultsJSON(w, result, params)
h.promReadMetrics.fetchSuccess.Inc(1)
timer.Stop()
return
}
h.promReadMetrics.fetchSuccess.Inc(1)
timer.Stop()
// TODO: Support multiple result types
renderResultsJSON(w, result, params, h.keepNans)
}
// ServeHTTPWithEngine returns query results from the storage
func (h *PromReadHandler) ServeHTTPWithEngine(
w http.ResponseWriter,
r *http.Request,
engine executor.Engine,
opts *executor.QueryOptions,
fetchOpts *storage.FetchOptions,
) ([]*ts.Series, models.RequestParams, *RespError) {
ctx := context.WithValue(r.Context(), handler.HeaderKey, r.Header)
logger := logging.WithContext(ctx, h.instrumentOpts)
params, rErr := parseParams(r, engine.Options(), h.timeoutOps, fetchOpts, h.instrumentOpts)
if rErr != nil {
h.promReadMetrics.fetchErrorsClient.Inc(1)
return nil, emptyReqParams, &RespError{Err: rErr.Inner(), Code: rErr.Code()}
}
if params.Debug {
logger.Info("Request params", zap.Any("params", params))
}
if err := h.validateRequest(¶ms); err != nil {
h.promReadMetrics.fetchErrorsClient.Inc(1)
return nil, emptyReqParams, &RespError{Err: err, Code: http.StatusBadRequest}
}
result, err := read(ctx, engine, opts, fetchOpts, h.tagOpts, w, params, h.instrumentOpts)
if err != nil {
sp := xopentracing.SpanFromContextOrNoop(ctx)
sp.LogFields(opentracinglog.Error(err))
opentracingext.Error.Set(sp, true)
logger.Error("unable to fetch data", zap.Error(err))
h.promReadMetrics.fetchErrorsServer.Inc(1)
return nil, emptyReqParams, &RespError{Err: err, Code: http.StatusInternalServerError}
}
// TODO: Support multiple result types
w.Header().Set("Content-Type", "application/json")
return result, params, nil
}
func (h *PromReadHandler) validateRequest(params *models.RequestParams) error {
// Impose a rough limit on the number of returned time series. This is intended to prevent things like
// querying from the beginning of time with a 1s step size.
// Approach taken directly from prom.
numSteps := int64(params.End.Sub(params.Start) / params.Step)
maxComputedDatapoints := h.limitsCfg.MaxComputedDatapoints()
if maxComputedDatapoints > 0 && numSteps > maxComputedDatapoints {
return fmt.Errorf(
"querying from %v to %v with step size %v would result in too many datapoints "+
"(end - start / step > %d). Either decrease the query resolution (?step=XX), decrease the time window, "+
"or increase the limit (`limits.maxComputedDatapoints`)",
params.Start, params.End, params.Step, maxComputedDatapoints,
)
}
return nil
}