mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-15 16:30:55 +01:00
317 lines
7.6 KiB
Go
317 lines
7.6 KiB
Go
package promql
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import (
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"flag"
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"fmt"
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"math"
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"sort"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/netstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/metrics"
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"github.com/VictoriaMetrics/metricsql"
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)
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var (
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logSlowQueryDuration = flag.Duration("search.logSlowQueryDuration", 5*time.Second, "Log queries with execution time exceeding this value. Zero disables slow query logging")
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treatDotsAsIsInRegexps = flag.Bool("search.treatDotsAsIsInRegexps", false, "Whether to treat dots as is in regexp label filters used in queries. "+
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`For example, foo{bar=~"a.b.c"} will be automatically converted to foo{bar=~"a\\.b\\.c"}, i.e. all the dots in regexp filters will be automatically escaped `+
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`in order to match only dot char instead of matching any char. Dots in ".+", ".*" and ".{n}" regexps aren't escaped. `+
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`Such escaping can be useful when querying Graphite data`)
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)
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var slowQueries = metrics.NewCounter(`vm_slow_queries_total`)
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// Exec executes q for the given ec.
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func Exec(ec *EvalConfig, q string, isFirstPointOnly bool) ([]netstorage.Result, error) {
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if *logSlowQueryDuration > 0 {
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startTime := time.Now()
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defer func() {
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d := time.Since(startTime)
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if d >= *logSlowQueryDuration {
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logger.Warnf("slow query according to -search.logSlowQueryDuration=%s: duration=%.3f seconds, start=%d, end=%d, step=%d, accountID=%d, projectID=%d, query=%q",
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*logSlowQueryDuration, d.Seconds(), ec.Start/1000, ec.End/1000, ec.Step/1000, ec.AuthToken.AccountID, ec.AuthToken.ProjectID, q)
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slowQueries.Inc()
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}
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}()
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}
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ec.validate()
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e, err := parsePromQLWithCache(q)
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if err != nil {
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return nil, err
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}
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qid := activeQueriesV.Add(ec, q)
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rv, err := evalExpr(ec, e)
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activeQueriesV.Remove(qid)
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if err != nil {
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return nil, err
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}
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if isFirstPointOnly {
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// Remove all the points except the first one from every time series.
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for _, ts := range rv {
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ts.Values = ts.Values[:1]
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ts.Timestamps = ts.Timestamps[:1]
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}
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}
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maySort := maySortResults(e, rv)
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result, err := timeseriesToResult(rv, maySort)
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if err != nil {
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return nil, err
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}
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return result, err
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}
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func maySortResults(e metricsql.Expr, tss []*timeseries) bool {
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if len(tss) > 100 {
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// There is no sense in sorting a lot of results
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return false
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}
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fe, ok := e.(*metricsql.FuncExpr)
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if !ok {
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return true
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}
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switch fe.Name {
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case "sort", "sort_desc",
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"sort_by_label", "sort_by_label_desc":
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return false
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default:
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return true
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}
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}
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func timeseriesToResult(tss []*timeseries, maySort bool) ([]netstorage.Result, error) {
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tss = removeNaNs(tss)
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result := make([]netstorage.Result, len(tss))
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m := make(map[string]struct{}, len(tss))
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bb := bbPool.Get()
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for i, ts := range tss {
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bb.B = marshalMetricNameSorted(bb.B[:0], &ts.MetricName)
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if _, ok := m[string(bb.B)]; ok {
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return nil, fmt.Errorf(`duplicate output timeseries: %s`, stringMetricName(&ts.MetricName))
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}
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m[string(bb.B)] = struct{}{}
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rs := &result[i]
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rs.MetricNameMarshaled = append(rs.MetricNameMarshaled[:0], bb.B...)
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rs.MetricName.CopyFrom(&ts.MetricName)
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rs.Values = append(rs.Values[:0], ts.Values...)
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rs.Timestamps = append(rs.Timestamps[:0], ts.Timestamps...)
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}
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bbPool.Put(bb)
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if maySort {
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sort.Slice(result, func(i, j int) bool {
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return string(result[i].MetricNameMarshaled) < string(result[j].MetricNameMarshaled)
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})
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}
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return result, nil
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}
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func removeNaNs(tss []*timeseries) []*timeseries {
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rvs := tss[:0]
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for _, ts := range tss {
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allNans := true
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for _, v := range ts.Values {
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if !math.IsNaN(v) {
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allNans = false
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break
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}
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}
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if allNans {
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// Skip timeseries with all NaNs.
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continue
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}
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rvs = append(rvs, ts)
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}
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for i := len(rvs); i < len(tss); i++ {
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// Zero unused time series, so GC could reclaim them.
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tss[i] = nil
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}
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return rvs
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}
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func adjustCmpOps(e metricsql.Expr) metricsql.Expr {
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metricsql.VisitAll(e, func(expr metricsql.Expr) {
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be, ok := expr.(*metricsql.BinaryOpExpr)
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if !ok {
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return
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}
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if !metricsql.IsBinaryOpCmp(be.Op) {
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return
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}
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if _, ok := be.Left.(*metricsql.NumberExpr); !ok {
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return
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}
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// Convert 'num cmpOp query' expression to `query reverseCmpOp num` expression
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// like Prometheus does. For isntance, `0.5 < foo` must be converted to `foo > 0.5`
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// in order to return valid values for `foo` that are bigger than 0.5.
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be.Right, be.Left = be.Left, be.Right
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be.Op = getReverseCmpOp(be.Op)
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})
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return e
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}
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func getReverseCmpOp(op string) string {
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switch op {
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case ">":
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return "<"
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case "<":
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return ">"
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case ">=":
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return "<="
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case "<=":
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return ">="
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default:
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// there is no need in changing `==` and `!=`.
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return op
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}
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}
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func parsePromQLWithCache(q string) (metricsql.Expr, error) {
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pcv := parseCacheV.Get(q)
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if pcv == nil {
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e, err := metricsql.Parse(q)
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if err == nil {
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e = metricsql.Optimize(e)
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e = adjustCmpOps(e)
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if *treatDotsAsIsInRegexps {
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e = escapeDotsInRegexpLabelFilters(e)
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}
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}
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pcv = &parseCacheValue{
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e: e,
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err: err,
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}
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parseCacheV.Put(q, pcv)
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}
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if pcv.err != nil {
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return nil, pcv.err
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}
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return pcv.e, nil
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}
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func escapeDotsInRegexpLabelFilters(e metricsql.Expr) metricsql.Expr {
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metricsql.VisitAll(e, func(expr metricsql.Expr) {
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me, ok := expr.(*metricsql.MetricExpr)
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if !ok {
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return
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}
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for i := range me.LabelFilters {
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f := &me.LabelFilters[i]
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if f.IsRegexp {
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f.Value = escapeDots(f.Value)
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}
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}
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})
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return e
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}
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func escapeDots(s string) string {
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dotsCount := strings.Count(s, ".")
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if dotsCount <= 0 {
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return s
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}
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result := make([]byte, 0, len(s)+2*dotsCount)
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for i := 0; i < len(s); i++ {
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if s[i] == '.' && (i == 0 || s[i-1] != '\\') && (i+1 == len(s) || i+1 < len(s) && s[i+1] != '*' && s[i+1] != '+' && s[i+1] != '{') {
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// Escape a dot if the following conditions are met:
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// - if it isn't escaped already, i.e. if there is no `\` char before the dot.
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// - if there is no regexp modifiers such as '+', '*' or '{' after the dot.
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result = append(result, '\\', '.')
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} else {
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result = append(result, s[i])
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}
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}
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return string(result)
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}
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var parseCacheV = func() *parseCache {
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pc := &parseCache{
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m: make(map[string]*parseCacheValue),
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}
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metrics.NewGauge(`vm_cache_requests_total{type="promql/parse"}`, func() float64 {
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return float64(pc.Requests())
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})
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metrics.NewGauge(`vm_cache_misses_total{type="promql/parse"}`, func() float64 {
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return float64(pc.Misses())
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})
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metrics.NewGauge(`vm_cache_entries{type="promql/parse"}`, func() float64 {
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return float64(pc.Len())
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})
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return pc
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}()
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const parseCacheMaxLen = 10e3
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type parseCacheValue struct {
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e metricsql.Expr
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err error
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}
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type parseCache struct {
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// Move atomic counters to the top of struct for 8-byte alignment on 32-bit arch.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/212
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requests uint64
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misses uint64
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m map[string]*parseCacheValue
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mu sync.RWMutex
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}
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func (pc *parseCache) Requests() uint64 {
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return atomic.LoadUint64(&pc.requests)
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}
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func (pc *parseCache) Misses() uint64 {
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return atomic.LoadUint64(&pc.misses)
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}
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func (pc *parseCache) Len() uint64 {
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pc.mu.RLock()
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n := len(pc.m)
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pc.mu.RUnlock()
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return uint64(n)
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}
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func (pc *parseCache) Get(q string) *parseCacheValue {
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atomic.AddUint64(&pc.requests, 1)
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pc.mu.RLock()
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pcv := pc.m[q]
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pc.mu.RUnlock()
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if pcv == nil {
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atomic.AddUint64(&pc.misses, 1)
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}
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return pcv
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}
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func (pc *parseCache) Put(q string, pcv *parseCacheValue) {
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pc.mu.Lock()
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overflow := len(pc.m) - parseCacheMaxLen
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if overflow > 0 {
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// Remove 10% of items from the cache.
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overflow = int(float64(len(pc.m)) * 0.1)
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for k := range pc.m {
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delete(pc.m, k)
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overflow--
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if overflow <= 0 {
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break
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}
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}
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}
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pc.m[q] = pcv
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pc.mu.Unlock()
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}
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