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split_by_interval.go
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split_by_interval.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
// This is a modified copy from
// https://github.com/cortexproject/cortex/blob/master/pkg/querier/queryrange/split_by_interval.go.
package queryfrontend
import (
"context"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/thanos-io/thanos/internal/cortex/querier/queryrange"
)
// SplitByIntervalMiddleware creates a new Middleware that splits requests by a given interval.
func SplitByIntervalMiddleware(interval queryrange.IntervalFn, limits queryrange.Limits, merger queryrange.Merger, registerer prometheus.Registerer) queryrange.Middleware {
return queryrange.MiddlewareFunc(func(next queryrange.Handler) queryrange.Handler {
return splitByInterval{
next: next,
limits: limits,
merger: merger,
interval: interval,
splitByCounter: promauto.With(registerer).NewCounter(prometheus.CounterOpts{
Namespace: "thanos",
Name: "frontend_split_queries_total",
Help: "Total number of underlying query requests after the split by interval is applied",
}),
}
})
}
type splitByInterval struct {
next queryrange.Handler
limits queryrange.Limits
merger queryrange.Merger
interval queryrange.IntervalFn
// Metrics.
splitByCounter prometheus.Counter
}
func (s splitByInterval) Do(ctx context.Context, r queryrange.Request) (queryrange.Response, error) {
// First we're going to build new requests, one for each day, taking care
// to line up the boundaries with step.
reqs, err := splitQuery(r, s.interval(r))
if err != nil {
return nil, err
}
s.splitByCounter.Add(float64(len(reqs)))
reqResps, err := queryrange.DoRequests(ctx, s.next, reqs, s.limits)
if err != nil {
return nil, err
}
resps := make([]queryrange.Response, 0, len(reqResps))
for _, reqResp := range reqResps {
resps = append(resps, reqResp.Response)
}
response, err := s.merger.MergeResponse(r, resps...)
if err != nil {
return nil, err
}
return response, nil
}
func splitQuery(r queryrange.Request, interval time.Duration) ([]queryrange.Request, error) {
var reqs []queryrange.Request
if _, ok := r.(*ThanosQueryRangeRequest); ok {
// Replace @ modifier function to their respective constant values in the query.
// This way subqueries will be evaluated at the same time as the parent query.
query, err := queryrange.EvaluateAtModifierFunction(r.GetQuery(), r.GetStart(), r.GetEnd())
if err != nil {
return nil, err
}
if start := r.GetStart(); start == r.GetEnd() {
reqs = append(reqs, r.WithStartEnd(start, start))
} else {
for ; start < r.GetEnd(); start = nextIntervalBoundary(start, r.GetStep(), interval) + r.GetStep() {
end := nextIntervalBoundary(start, r.GetStep(), interval)
if end+r.GetStep() >= r.GetEnd() {
end = r.GetEnd()
}
reqs = append(reqs, r.WithQuery(query).WithStartEnd(start, end))
}
}
} else {
dur := int64(interval / time.Millisecond)
for start := r.GetStart(); start < r.GetEnd(); start = start + dur {
end := start + dur
if end > r.GetEnd() {
end = r.GetEnd()
}
reqs = append(reqs, r.WithStartEnd(start, end))
}
}
return reqs, nil
}
// Round up to the step before the next interval boundary.
func nextIntervalBoundary(t, step int64, interval time.Duration) int64 {
msPerInterval := int64(interval / time.Millisecond)
startOfNextInterval := ((t / msPerInterval) + 1) * msPerInterval
// ensure that target is a multiple of steps away from the start time
target := startOfNextInterval - ((startOfNextInterval - t) % step)
if target == startOfNextInterval {
target -= step
}
return target
}