/
prom.go
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/
prom.go
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// Copyright (c) 2020 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 prom
import (
"errors"
"net/http"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/promql/parser"
promstorage "github.com/prometheus/prometheus/storage"
"github.com/m3db/m3/src/query/api/v1/options"
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/storage/prometheus"
)
// opts defines options for PromQL handler.
type opts struct {
promQLEngine *promql.Engine
instant bool
queryable promstorage.Queryable
newQueryFn NewQueryFn
}
// Option is a Prometheus handler option.
type Option func(*opts) error
// WithEngine sets the PromQL engine.
func WithEngine(promQLEngine *promql.Engine) Option {
return withEngine(promQLEngine, false)
}
// WithInstantEngine sets the PromQL instant engine.
func WithInstantEngine(promQLEngine *promql.Engine) Option {
return withEngine(promQLEngine, true)
}
func withEngine(promQLEngine *promql.Engine, instant bool) Option {
return func(o *opts) error {
if promQLEngine == nil {
return errors.New("invalid engine")
}
o.instant = instant
o.promQLEngine = promQLEngine
o.newQueryFn = newRangeQueryFn(promQLEngine, o.queryable)
if instant {
o.newQueryFn = newInstantQueryFn(promQLEngine, o.queryable)
}
return nil
}
}
func newDefaultOptions(hOpts options.HandlerOptions) opts {
queryable := prometheus.NewPrometheusQueryable(
prometheus.PrometheusOptions{
Storage: hOpts.Storage(),
InstrumentOptions: hOpts.InstrumentOpts(),
})
return opts{
promQLEngine: hOpts.PrometheusEngine(),
queryable: queryable,
instant: false,
newQueryFn: newRangeQueryFn(hOpts.PrometheusEngine(), queryable),
}
}
// NewReadHandler creates a handler to handle PromQL requests.
func NewReadHandler(hOpts options.HandlerOptions, options ...Option) (http.Handler, error) {
opts := newDefaultOptions(hOpts)
for _, optionFn := range options {
if err := optionFn(&opts); err != nil {
return nil, err
}
}
return newReadHandler(hOpts, opts)
}
// ApplyRangeWarnings applies warnings encountered during execution.
func ApplyRangeWarnings(
query string, meta *block.ResultMetadata,
) error {
expr, err := parser.ParseExpr(query)
if err != nil {
return err
}
parser.Inspect(expr, func(node parser.Node, path []parser.Node) error {
if n, ok := node.(*parser.MatrixSelector); ok {
meta.VerifyTemporalRange(n.Range)
}
return nil
})
return nil
}