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d2da21121c
This also short-circuits optimize() for now, since it is complex to implement for the new operator, and ops generated by the query layer already fulfill the needed invariants. We should still investigate later whether to completely delete operator optimization code or extend it to support getValueRangeAtIntervalOp operators.
137 lines
4.5 KiB
Go
137 lines
4.5 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metric
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import (
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"sort"
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"time"
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clientmodel "github.com/prometheus/client_golang/model"
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)
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var (
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// firstSupertime is the smallest valid supertime that may be seeked to.
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firstSupertime = []byte{0, 0, 0, 0, 0, 0, 0, 0}
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// lastSupertime is the largest valid supertime that may be seeked to.
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lastSupertime = []byte{127, 255, 255, 255, 255, 255, 255, 255}
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)
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// Represents the summation of all datastore queries that shall be performed to
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// extract values. Each operation mutates the state of the builder.
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type ViewRequestBuilder interface {
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GetMetricAtTime(fingerprint *clientmodel.Fingerprint, time time.Time)
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GetMetricAtInterval(fingerprint *clientmodel.Fingerprint, from, through time.Time, interval time.Duration)
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GetMetricRange(fingerprint *clientmodel.Fingerprint, from, through time.Time)
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ScanJobs() scanJobs
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}
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// Contains the various unoptimized requests for data.
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type viewRequestBuilder struct {
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operations map[clientmodel.Fingerprint]ops
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}
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// Furnishes a ViewRequestBuilder for remarking what types of queries to perform.
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func NewViewRequestBuilder() *viewRequestBuilder {
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return &viewRequestBuilder{
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operations: make(map[clientmodel.Fingerprint]ops),
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}
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}
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// Gets for the given Fingerprint either the value at that time if there is an
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// match or the one or two values adjacent thereto.
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func (v *viewRequestBuilder) GetMetricAtTime(fingerprint *clientmodel.Fingerprint, time time.Time) {
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ops := v.operations[*fingerprint]
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ops = append(ops, &getValuesAtTimeOp{
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time: time,
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})
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v.operations[*fingerprint] = ops
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}
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// Gets for the given Fingerprint either the value at that interval from From
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// through Through if there is an match or the one or two values adjacent
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// for each point.
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func (v *viewRequestBuilder) GetMetricAtInterval(fingerprint *clientmodel.Fingerprint, from, through time.Time, interval time.Duration) {
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ops := v.operations[*fingerprint]
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ops = append(ops, &getValuesAtIntervalOp{
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from: from,
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through: through,
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interval: interval,
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})
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v.operations[*fingerprint] = ops
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}
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// Gets for the given Fingerprint the values that occur inclusively from From
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// through Through.
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func (v *viewRequestBuilder) GetMetricRange(fingerprint *clientmodel.Fingerprint, from, through time.Time) {
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ops := v.operations[*fingerprint]
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ops = append(ops, &getValuesAlongRangeOp{
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from: from,
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through: through,
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})
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v.operations[*fingerprint] = ops
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}
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// Gets value ranges at intervals for the given Fingerprint:
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//
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// |----| |----| |----| |----|
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// ^ ^ ^ ^ ^ ^
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// | \------------/ \----/ |
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// from interval rangeDuration through
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func (v *viewRequestBuilder) GetMetricRangeAtInterval(fingerprint *clientmodel.Fingerprint, from, through time.Time, interval, rangeDuration time.Duration) {
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ops := v.operations[*fingerprint]
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ops = append(ops, &getValueRangeAtIntervalOp{
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rangeFrom: from,
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rangeThrough: from.Add(rangeDuration),
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rangeDuration: rangeDuration,
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interval: interval,
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through: through,
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})
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v.operations[*fingerprint] = ops
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}
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// Emits the optimized scans that will occur in the data store. This
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// effectively resets the ViewRequestBuilder back to a pristine state.
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func (v *viewRequestBuilder) ScanJobs() (j scanJobs) {
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for fingerprint, operations := range v.operations {
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sort.Sort(startsAtSort{operations})
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fpCopy := fingerprint
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j = append(j, scanJob{
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fingerprint: &fpCopy,
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// BUG: Evaluate whether we need to implement an optimize() working also
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// for getValueRangeAtIntervalOp and use it here instead of just passing
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// through the list of ops as-is.
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operations: operations,
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})
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delete(v.operations, fingerprint)
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}
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sort.Sort(j)
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return
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}
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type view struct {
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*memorySeriesStorage
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}
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func (v view) appendSamples(fingerprint *clientmodel.Fingerprint, samples Values) {
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v.memorySeriesStorage.appendSamplesWithoutIndexing(fingerprint, samples)
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}
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func newView() view {
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return view{NewMemorySeriesStorage(MemorySeriesOptions{})}
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}
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