cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/promapi/range.go
110lines · modecode
| 1 | package promapi |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "net" |
| 8 | "strings" |
| 9 | "time" |
| 10 | |
| 11 | "github.com/prometheus/client_golang/api" |
| 12 | v1 "github.com/prometheus/client_golang/api/prometheus/v1" |
| 13 | "github.com/prometheus/common/model" |
| 14 | "github.com/rs/zerolog/log" |
| 15 | ) |
| 16 | |
| 17 | type RangeQueryResult struct { |
| 18 | Samples []*model.SampleStream |
| 19 | Start time.Time |
| 20 | End time.Time |
| 21 | DurationSeconds float64 |
| 22 | } |
| 23 | |
| 24 | func RangeQuery(uri string, timeout time.Duration, expr string, start, end time.Time, step time.Duration, lockKey *string) (*RangeQueryResult, error) { |
| 25 | key := uri |
| 26 | if lockKey != nil { |
| 27 | key = *lockKey |
| 28 | } |
| 29 | |
| 30 | log.Debug(). |
| 31 | Str("key", key). |
| 32 | Str("uri", uri). |
| 33 | Str("query", expr). |
| 34 | Time("start", start). |
| 35 | Time("end", end). |
| 36 | Str("step", HumanizeDuration(step)). |
| 37 | Msg("Scheduling prometheus range query") |
| 38 | |
| 39 | km.Lock(key) |
| 40 | defer km.Unlock((key)) |
| 41 | |
| 42 | log.Debug().Str("uri", uri).Str("query", expr).Msg("Range query started") |
| 43 | |
| 44 | client, err := api.NewClient(api.Config{Address: uri}) |
| 45 | if err != nil { |
| 46 | log.Error().Err(err).Msg("Failed to setup new Prometheus API client") |
| 47 | return nil, err |
| 48 | } |
| 49 | |
| 50 | v1api := v1.NewAPI(client) |
| 51 | ctx, cancel := context.WithTimeout(context.Background(), timeout) |
| 52 | defer cancel() |
| 53 | |
| 54 | r := v1.Range{ |
| 55 | Start: start, |
| 56 | End: end, |
| 57 | Step: step, |
| 58 | } |
| 59 | qstart := time.Now() |
| 60 | result, _, err := v1api.QueryRange(ctx, expr, r) |
| 61 | duration := time.Since(qstart) |
| 62 | log.Debug(). |
| 63 | Str("uri", uri). |
| 64 | Str("query", expr). |
| 65 | Str("duration", HumanizeDuration(duration)). |
| 66 | Msg("Range query completed") |
| 67 | if err != nil { |
| 68 | log.Error().Err(err).Str("uri", uri).Str("query", expr).Msg("Range query failed") |
| 69 | if isRetryable(err) { |
| 70 | delta := end.Sub(start) / 2 |
| 71 | log.Warn().Str("delta", HumanizeDuration(delta)).Msg("Retrying request with smaller range") |
| 72 | b, _ := start.MarshalText() |
| 73 | newKey := fmt.Sprintf("%s/retry/%s", key, string(b)) |
| 74 | return RangeQuery(uri, timeout, expr, start.Add(delta), end, step, &newKey) |
| 75 | } |
| 76 | return nil, err |
| 77 | } |
| 78 | |
| 79 | qr := RangeQueryResult{ |
| 80 | DurationSeconds: duration.Seconds(), |
| 81 | Start: start, |
| 82 | End: end, |
| 83 | } |
| 84 | |
| 85 | switch result.Type() { |
| 86 | case model.ValMatrix: |
| 87 | samples := result.(model.Matrix) |
| 88 | qr.Samples = samples |
| 89 | |
| 90 | case model.ValString: |
| 91 | fmt.Println("ValString") |
| 92 | default: |
| 93 | log.Error().Err(err).Str("uri", uri).Str("query", expr).Msgf("Range query returned unknown result type: %v", result) |
| 94 | return nil, fmt.Errorf("unknown result type: %v", result) |
| 95 | } |
| 96 | log.Debug().Str("uri", uri).Str("query", expr).Int("samples", len(qr.Samples)).Msg("Parsed range response") |
| 97 | |
| 98 | return &qr, nil |
| 99 | } |
| 100 | |
| 101 | func isRetryable(err error) bool { |
| 102 | var neterr net.Error |
| 103 | if ok := errors.As(err, &neterr); ok && neterr.Timeout() { |
| 104 | return true |
| 105 | } |
| 106 | if strings.Contains(err.Error(), "query processing would load too many samples into memory in ") { |
| 107 | return true |
| 108 | } |
| 109 | return false |
| 110 | } |
| 111 | |