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results_cache.go
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results_cache.go
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package queryrange
import (
"context"
"flag"
"fmt"
"net/http"
"sort"
"strings"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/gogo/protobuf/proto"
"github.com/gogo/protobuf/types"
"github.com/opentracing/opentracing-go"
otlog "github.com/opentracing/opentracing-go/log"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/model/timestamp"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/promql/parser"
"github.com/uber/jaeger-client-go"
"github.com/weaveworks/common/httpgrpc"
"github.com/cortexproject/cortex/pkg/chunk/cache"
"github.com/cortexproject/cortex/pkg/cortexpb"
"github.com/cortexproject/cortex/pkg/querier"
"github.com/cortexproject/cortex/pkg/querier/tripperware"
"github.com/cortexproject/cortex/pkg/tenant"
"github.com/cortexproject/cortex/pkg/util/flagext"
util_log "github.com/cortexproject/cortex/pkg/util/log"
"github.com/cortexproject/cortex/pkg/util/spanlogger"
"github.com/cortexproject/cortex/pkg/util/validation"
)
var (
// Value that cacheControlHeader has if the response indicates that the results should not be cached.
noStoreValue = "no-store"
// ResultsCacheGenNumberHeaderName holds name of the header we want to set in http response
ResultsCacheGenNumberHeaderName = "Results-Cache-Gen-Number"
)
type CacheGenNumberLoader interface {
GetResultsCacheGenNumber(tenantIDs []string) string
}
// ResultsCacheConfig is the config for the results cache.
type ResultsCacheConfig struct {
CacheConfig cache.Config `yaml:"cache"`
Compression string `yaml:"compression"`
CacheQueryableSamplesStats bool `yaml:"cache_queryable_samples_stats"`
}
// RegisterFlags registers flags.
func (cfg *ResultsCacheConfig) RegisterFlags(f *flag.FlagSet) {
cfg.CacheConfig.RegisterFlagsWithPrefix("frontend.", "", f)
f.StringVar(&cfg.Compression, "frontend.compression", "", "Use compression in results cache. Supported values are: 'snappy' and '' (disable compression).")
f.BoolVar(&cfg.CacheQueryableSamplesStats, "frontend.cache-queryable-samples-stats", false, "Cache Statistics queryable samples on results cache.")
//lint:ignore faillint Need to pass the global logger like this for warning on deprecated methods
flagext.DeprecatedFlag(f, "frontend.cache-split-interval", "Deprecated: The maximum interval expected for each request, results will be cached per single interval. This behavior is now determined by querier.split-queries-by-interval.", util_log.Logger)
}
func (cfg *ResultsCacheConfig) Validate(qCfg querier.Config) error {
switch cfg.Compression {
case "snappy", "":
// valid
default:
return errors.Errorf("unsupported compression type: %s", cfg.Compression)
}
if cfg.CacheQueryableSamplesStats && !qCfg.EnablePerStepStats {
return errors.New("frontend.cache-queryable-samples-stats may only be enabled in conjunction with querier.per-step-stats-enabled. Please set the latter")
}
return cfg.CacheConfig.Validate()
}
// Extractor is used by the cache to extract a subset of a response from a cache entry.
type Extractor interface {
// Extract extracts a subset of a response from the `start` and `end` timestamps in milliseconds in the `from` response.
Extract(start, end int64, from tripperware.Response) tripperware.Response
ResponseWithoutHeaders(resp tripperware.Response) tripperware.Response
ResponseWithoutStats(resp tripperware.Response) tripperware.Response
}
// PrometheusResponseExtractor helps extracting specific info from Query Response.
type PrometheusResponseExtractor struct{}
// Extract extracts response for specific a range from a response.
func (PrometheusResponseExtractor) Extract(start, end int64, from tripperware.Response) tripperware.Response {
promRes := from.(*PrometheusResponse)
return &PrometheusResponse{
Status: StatusSuccess,
Data: PrometheusData{
ResultType: promRes.Data.ResultType,
Result: extractMatrix(start, end, promRes.Data.Result),
Stats: extractStats(start, end, promRes.Data.Stats),
},
Headers: promRes.Headers,
}
}
// ResponseWithoutHeaders is useful in caching data without headers since
// we anyways do not need headers for sending back the response so this saves some space by reducing size of the objects.
func (PrometheusResponseExtractor) ResponseWithoutHeaders(resp tripperware.Response) tripperware.Response {
promRes := resp.(*PrometheusResponse)
return &PrometheusResponse{
Status: StatusSuccess,
Data: PrometheusData{
ResultType: promRes.Data.ResultType,
Result: promRes.Data.Result,
Stats: promRes.Data.Stats,
},
}
}
// ResponseWithoutStats is returns the response without the stats information
func (PrometheusResponseExtractor) ResponseWithoutStats(resp tripperware.Response) tripperware.Response {
promRes := resp.(*PrometheusResponse)
return &PrometheusResponse{
Status: StatusSuccess,
Data: PrometheusData{
ResultType: promRes.Data.ResultType,
Result: promRes.Data.Result,
},
Headers: promRes.Headers,
}
}
// CacheSplitter generates cache keys. This is a useful interface for downstream
// consumers who wish to implement their own strategies.
type CacheSplitter interface {
GenerateCacheKey(userID string, r tripperware.Request) string
}
// constSplitter is a utility for using a constant split interval when determining cache keys
type constSplitter time.Duration
// GenerateCacheKey generates a cache key based on the userID, Request and interval.
func (t constSplitter) GenerateCacheKey(userID string, r tripperware.Request) string {
currentInterval := r.GetStart() / int64(time.Duration(t)/time.Millisecond)
return fmt.Sprintf("%s:%s:%d:%d", userID, r.GetQuery(), r.GetStep(), currentInterval)
}
// ShouldCacheFn checks whether the current request should go to cache
// or not. If not, just send the request to next handler.
type ShouldCacheFn func(r tripperware.Request) bool
type resultsCache struct {
logger log.Logger
cfg ResultsCacheConfig
next tripperware.Handler
cache cache.Cache
limits tripperware.Limits
splitter CacheSplitter
extractor Extractor
minCacheExtent int64 // discard any cache extent smaller than this
merger tripperware.Merger
cacheGenNumberLoader CacheGenNumberLoader
shouldCache ShouldCacheFn
cacheQueryableSamplesStats bool
}
// NewResultsCacheMiddleware creates results cache middleware from config.
// The middleware cache result using a unique cache key for a given request (step,query,user) and interval.
// The cache assumes that each request length (end-start) is below or equal the interval.
// Each request starting from within the same interval will hit the same cache entry.
// If the cache doesn't have the entire duration of the request cached, it will query the uncached parts and append them to the cache entries.
// see `generateKey`.
func NewResultsCacheMiddleware(
logger log.Logger,
cfg ResultsCacheConfig,
splitter CacheSplitter,
limits tripperware.Limits,
merger tripperware.Merger,
extractor Extractor,
cacheGenNumberLoader CacheGenNumberLoader,
shouldCache ShouldCacheFn,
reg prometheus.Registerer,
) (tripperware.Middleware, cache.Cache, error) {
c, err := cache.New(cfg.CacheConfig, reg, logger)
if err != nil {
return nil, nil, err
}
if cfg.Compression == "snappy" {
c = cache.NewSnappy(c, logger)
}
if cacheGenNumberLoader != nil {
c = cache.NewCacheGenNumMiddleware(c)
}
return tripperware.MiddlewareFunc(func(next tripperware.Handler) tripperware.Handler {
return &resultsCache{
logger: logger,
cfg: cfg,
next: next,
cache: c,
limits: limits,
merger: merger,
extractor: extractor,
minCacheExtent: (5 * time.Minute).Milliseconds(),
splitter: splitter,
cacheGenNumberLoader: cacheGenNumberLoader,
shouldCache: shouldCache,
cacheQueryableSamplesStats: cfg.CacheQueryableSamplesStats,
}
}), c, nil
}
func (s resultsCache) Do(ctx context.Context, r tripperware.Request) (tripperware.Response, error) {
tenantIDs, err := tenant.TenantIDs(ctx)
respWithStats := r.GetStats() != "" && s.cacheQueryableSamplesStats
if err != nil {
return nil, httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
// If cache_queryable_samples_stats is enabled we always need request the status upstream
if s.cacheQueryableSamplesStats {
r = r.WithStats("all")
} else {
r = r.WithStats("")
}
if s.shouldCache != nil && !s.shouldCache(r) {
level.Debug(util_log.WithContext(ctx, s.logger)).Log("msg", "should not cache", "start", r.GetStart(), "spanID", jaegerSpanID(ctx))
return s.next.Do(ctx, r)
}
if s.cacheGenNumberLoader != nil {
ctx = cache.InjectCacheGenNumber(ctx, s.cacheGenNumberLoader.GetResultsCacheGenNumber(tenantIDs))
}
var (
key = s.splitter.GenerateCacheKey(tenant.JoinTenantIDs(tenantIDs), r)
extents []Extent
response tripperware.Response
)
maxCacheFreshness := validation.MaxDurationPerTenant(tenantIDs, s.limits.MaxCacheFreshness)
maxCacheTime := int64(model.Now().Add(-maxCacheFreshness))
if r.GetStart() > maxCacheTime {
level.Debug(util_log.WithContext(ctx, s.logger)).Log("msg", "cache miss", "start", r.GetStart(), "spanID", jaegerSpanID(ctx))
return s.next.Do(ctx, r)
}
cached, ok := s.get(ctx, key)
if ok {
response, extents, err = s.handleHit(ctx, r, cached, maxCacheTime)
} else {
response, extents, err = s.handleMiss(ctx, r, maxCacheTime)
}
if err == nil && len(extents) > 0 {
extents, err := s.filterRecentExtents(r, maxCacheFreshness, extents)
if err != nil {
return nil, err
}
s.put(ctx, key, extents)
}
if err == nil && !respWithStats {
response = s.extractor.ResponseWithoutStats(response)
}
return response, err
}
// shouldCacheResponse says whether the response should be cached or not.
func (s resultsCache) shouldCacheResponse(ctx context.Context, req tripperware.Request, r tripperware.Response, maxCacheTime int64) bool {
headerValues := getHeaderValuesWithName(r, cacheControlHeader)
for _, v := range headerValues {
if v == noStoreValue {
level.Debug(util_log.WithContext(ctx, s.logger)).Log("msg", fmt.Sprintf("%s header in response is equal to %s, not caching the response", cacheControlHeader, noStoreValue))
return false
}
}
if !s.isAtModifierCachable(ctx, req, maxCacheTime) {
return false
}
if s.cacheGenNumberLoader == nil {
return true
}
genNumbersFromResp := getHeaderValuesWithName(r, ResultsCacheGenNumberHeaderName)
genNumberFromCtx := cache.ExtractCacheGenNumber(ctx)
if len(genNumbersFromResp) == 0 && genNumberFromCtx != "" {
level.Debug(util_log.WithContext(ctx, s.logger)).Log("msg", fmt.Sprintf("we found results cache gen number %s set in store but none in headers", genNumberFromCtx))
return false
}
for _, gen := range genNumbersFromResp {
if gen != genNumberFromCtx {
level.Debug(util_log.WithContext(ctx, s.logger)).Log("msg", fmt.Sprintf("inconsistency in results cache gen numbers %s (GEN-FROM-RESPONSE) != %s (GEN-FROM-STORE), not caching the response", gen, genNumberFromCtx))
return false
}
}
return true
}
var errAtModifierAfterEnd = errors.New("at modifier after end")
// isAtModifierCachable returns true if the @ modifier result
// is safe to cache.
func (s resultsCache) isAtModifierCachable(ctx context.Context, r tripperware.Request, maxCacheTime int64) bool {
// There are 2 cases when @ modifier is not safe to cache:
// 1. When @ modifier points to time beyond the maxCacheTime.
// 2. If the @ modifier time is > the query range end while being
// below maxCacheTime. In such cases if any tenant is intentionally
// playing with old data, we could cache empty result if we look
// beyond query end.
query := r.GetQuery()
if !strings.Contains(query, "@") {
return true
}
expr, err := parser.ParseExpr(query)
if err != nil {
// We are being pessimistic in such cases.
level.Warn(util_log.WithContext(ctx, s.logger)).Log("msg", "failed to parse query, considering @ modifier as not cachable", "query", query, "err", err)
return false
}
// This resolves the start() and end() used with the @ modifier.
expr = promql.PreprocessExpr(expr, timestamp.Time(r.GetStart()), timestamp.Time(r.GetEnd()))
end := r.GetEnd()
atModCachable := true
parser.Inspect(expr, func(n parser.Node, _ []parser.Node) error {
switch e := n.(type) {
case *parser.VectorSelector:
if e.Timestamp != nil && (*e.Timestamp > end || *e.Timestamp > maxCacheTime) {
atModCachable = false
return errAtModifierAfterEnd
}
case *parser.MatrixSelector:
ts := e.VectorSelector.(*parser.VectorSelector).Timestamp
if ts != nil && (*ts > end || *ts > maxCacheTime) {
atModCachable = false
return errAtModifierAfterEnd
}
case *parser.SubqueryExpr:
if e.Timestamp != nil && (*e.Timestamp > end || *e.Timestamp > maxCacheTime) {
atModCachable = false
return errAtModifierAfterEnd
}
}
return nil
})
return atModCachable
}
func getHeaderValuesWithName(r tripperware.Response, headerName string) (headerValues []string) {
for name, hv := range r.HTTPHeaders() {
if name != headerName {
continue
}
headerValues = append(headerValues, hv...)
}
return
}
func (s resultsCache) handleMiss(ctx context.Context, r tripperware.Request, maxCacheTime int64) (tripperware.Response, []Extent, error) {
level.Debug(util_log.WithContext(ctx, s.logger)).Log("msg", "handle miss", "start", r.GetStart(), "spanID", jaegerSpanID(ctx))
response, err := s.next.Do(ctx, r)
if err != nil {
return nil, nil, err
}
if !s.shouldCacheResponse(ctx, r, response, maxCacheTime) {
return response, []Extent{}, nil
}
extent, err := toExtent(ctx, r, s.extractor.ResponseWithoutHeaders(response))
if err != nil {
return nil, nil, err
}
extents := []Extent{
extent,
}
return response, extents, nil
}
func (s resultsCache) handleHit(ctx context.Context, r tripperware.Request, extents []Extent, maxCacheTime int64) (tripperware.Response, []Extent, error) {
var (
reqResps []tripperware.RequestResponse
err error
)
log, ctx := spanlogger.New(ctx, "handleHit")
defer log.Finish()
level.Debug(util_log.WithContext(ctx, log)).Log("msg", "handle hit", "start", r.GetStart(), "spanID", jaegerSpanID(ctx))
requests, responses, err := s.partition(r, extents)
if err != nil {
return nil, nil, err
}
if len(requests) == 0 {
response, err := s.merger.MergeResponse(ctx, r, responses...)
// No downstream requests so no need to write back to the cache.
return response, nil, err
}
reqResps, err = tripperware.DoRequests(ctx, s.next, requests, s.limits)
if err != nil {
return nil, nil, err
}
for _, reqResp := range reqResps {
responses = append(responses, reqResp.Response)
if !s.shouldCacheResponse(ctx, r, reqResp.Response, maxCacheTime) {
continue
}
extent, err := toExtent(ctx, reqResp.Request, s.extractor.ResponseWithoutHeaders(reqResp.Response))
if err != nil {
return nil, nil, err
}
extents = append(extents, extent)
}
sort.Slice(extents, func(i, j int) bool {
if extents[i].Start == extents[j].Start {
// as an optimization, for two extents starts at the same time, we
// put bigger extent at the front of the slice, which helps
// to reduce the amount of merge we have to do later.
return extents[i].End > extents[j].End
}
return extents[i].Start < extents[j].Start
})
// Merge any extents - potentially overlapping
accumulator, err := newAccumulator(extents[0])
if err != nil {
return nil, nil, err
}
mergedExtents := make([]Extent, 0, len(extents))
for i := 1; i < len(extents); i++ {
if accumulator.End+r.GetStep() < extents[i].Start {
mergedExtents, err = merge(mergedExtents, accumulator)
if err != nil {
return nil, nil, err
}
accumulator, err = newAccumulator(extents[i])
if err != nil {
return nil, nil, err
}
continue
}
if accumulator.End >= extents[i].End {
continue
}
accumulator.TraceId = jaegerTraceID(ctx)
accumulator.End = extents[i].End
currentRes, err := extents[i].toResponse()
if err != nil {
return nil, nil, err
}
merged, err := s.merger.MergeResponse(ctx, r, accumulator.Response, currentRes)
if err != nil {
return nil, nil, err
}
accumulator.Response = merged
}
mergedExtents, err = merge(mergedExtents, accumulator)
if err != nil {
return nil, nil, err
}
response, err := s.merger.MergeResponse(ctx, r, responses...)
return response, mergedExtents, err
}
type accumulator struct {
tripperware.Response
Extent
}
func merge(extents []Extent, acc *accumulator) ([]Extent, error) {
any, err := types.MarshalAny(acc.Response)
if err != nil {
return nil, err
}
return append(extents, Extent{
Start: acc.Extent.Start,
End: acc.Extent.End,
Response: any,
TraceId: acc.Extent.TraceId,
}), nil
}
func newAccumulator(base Extent) (*accumulator, error) {
res, err := base.toResponse()
if err != nil {
return nil, err
}
return &accumulator{
Response: res,
Extent: base,
}, nil
}
func toExtent(ctx context.Context, req tripperware.Request, res tripperware.Response) (Extent, error) {
any, err := types.MarshalAny(res)
if err != nil {
return Extent{}, err
}
return Extent{
Start: req.GetStart(),
End: req.GetEnd(),
Response: any,
TraceId: jaegerTraceID(ctx),
}, nil
}
// partition calculates the required requests to satisfy req given the cached data.
// extents must be in order by start time.
func (s resultsCache) partition(req tripperware.Request, extents []Extent) ([]tripperware.Request, []tripperware.Response, error) {
var requests []tripperware.Request
var cachedResponses []tripperware.Response
start := req.GetStart()
for _, extent := range extents {
// If there is no overlap, ignore this extent.
if extent.GetEnd() < start || extent.Start > req.GetEnd() {
continue
}
// If this extent is tiny and request is not tiny, discard it: more efficient to do a few larger queries.
// Hopefully tiny request can make tiny extent into not-so-tiny extent.
// However if the step is large enough, the split_query_by_interval middleware would generate a query with same start and end.
// For example, if the step size is more than 12h and the interval is 24h.
// This means the extent's start and end time would be same, even if the timerange covers several hours.
if (req.GetStart() != req.GetEnd()) && (req.GetEnd()-req.GetStart() > s.minCacheExtent) && (extent.End-extent.Start < s.minCacheExtent) {
continue
}
// If there is a bit missing at the front, make a request for that.
if start < extent.Start {
r := req.WithStartEnd(start, extent.Start)
requests = append(requests, r)
}
res, err := extent.toResponse()
if err != nil {
return nil, nil, err
}
// extract the overlap from the cached extent.
cachedResponses = append(cachedResponses, s.extractor.Extract(start, req.GetEnd(), res))
start = extent.End
}
// Lastly, make a request for any data missing at the end.
if start < req.GetEnd() {
r := req.WithStartEnd(start, req.GetEnd())
requests = append(requests, r)
}
// If start and end are the same (valid in promql), start == req.GetEnd() and we won't do the query.
// But we should only do the request if we don't have a valid cached response for it.
if req.GetStart() == req.GetEnd() && len(cachedResponses) == 0 {
requests = append(requests, req)
}
return requests, cachedResponses, nil
}
func (s resultsCache) filterRecentExtents(req tripperware.Request, maxCacheFreshness time.Duration, extents []Extent) ([]Extent, error) {
maxCacheTime := (int64(model.Now().Add(-maxCacheFreshness)) / req.GetStep()) * req.GetStep()
for i := range extents {
// Never cache data for the latest freshness period.
if extents[i].End > maxCacheTime {
extents[i].End = maxCacheTime
res, err := extents[i].toResponse()
if err != nil {
return nil, err
}
extracted := s.extractor.Extract(extents[i].Start, maxCacheTime, res)
any, err := types.MarshalAny(extracted)
if err != nil {
return nil, err
}
extents[i].Response = any
}
}
return extents, nil
}
func (s resultsCache) get(ctx context.Context, key string) ([]Extent, bool) {
found, bufs, _ := s.cache.Fetch(ctx, []string{cache.HashKey(key)})
if len(found) != 1 {
return nil, false
}
var resp CachedResponse
log, ctx := spanlogger.New(ctx, "unmarshal-extent") //nolint:ineffassign,staticcheck
defer log.Finish()
log.LogFields(otlog.Int("bytes", len(bufs[0])))
if err := proto.Unmarshal(bufs[0], &resp); err != nil {
level.Error(log).Log("msg", "error unmarshalling cached value", "err", err)
log.Error(err)
return nil, false
}
if resp.Key != key {
return nil, false
}
// Refreshes the cache if it contains an old proto schema.
for _, e := range resp.Extents {
if e.Response == nil {
return nil, false
}
}
return resp.Extents, true
}
func (s resultsCache) put(ctx context.Context, key string, extents []Extent) {
buf, err := proto.Marshal(&CachedResponse{
Key: key,
Extents: extents,
})
if err != nil {
level.Error(util_log.WithContext(ctx, s.logger)).Log("msg", "error marshalling cached value", "err", err)
return
}
s.cache.Store(ctx, []string{cache.HashKey(key)}, [][]byte{buf})
}
func jaegerSpanID(ctx context.Context) string {
spanContext, ok := getSpanContext(ctx)
if !ok {
return ""
}
return spanContext.SpanID().String()
}
func jaegerTraceID(ctx context.Context) string {
spanContext, ok := getSpanContext(ctx)
if !ok {
return ""
}
return spanContext.TraceID().String()
}
func getSpanContext(ctx context.Context) (jaeger.SpanContext, bool) {
span := opentracing.SpanFromContext(ctx)
if span == nil {
return jaeger.SpanContext{}, false
}
spanContext, ok := span.Context().(jaeger.SpanContext)
if !ok {
return jaeger.SpanContext{}, false
}
return spanContext, true
}
// extractStats returns the stats for a given time range
// this function is similar to extractSampleStream
func extractStats(start, end int64, stats *tripperware.PrometheusResponseStats) *tripperware.PrometheusResponseStats {
if stats == nil || stats.Samples == nil {
return stats
}
result := &tripperware.PrometheusResponseStats{Samples: &tripperware.PrometheusResponseSamplesStats{}}
for _, s := range stats.Samples.TotalQueryableSamplesPerStep {
if start <= s.TimestampMs && s.TimestampMs <= end {
result.Samples.TotalQueryableSamplesPerStep = append(result.Samples.TotalQueryableSamplesPerStep, s)
result.Samples.TotalQueryableSamples += s.Value
}
}
return result
}
func extractMatrix(start, end int64, matrix []tripperware.SampleStream) []tripperware.SampleStream {
result := make([]tripperware.SampleStream, 0, len(matrix))
for _, stream := range matrix {
extracted, ok := extractSampleStream(start, end, stream)
if ok {
result = append(result, extracted)
}
}
return result
}
func extractSampleStream(start, end int64, stream tripperware.SampleStream) (tripperware.SampleStream, bool) {
result := tripperware.SampleStream{
Labels: stream.Labels,
Samples: make([]cortexpb.Sample, 0, len(stream.Samples)),
}
for _, sample := range stream.Samples {
if start <= sample.TimestampMs && sample.TimestampMs <= end {
result.Samples = append(result.Samples, sample)
}
}
if len(result.Samples) == 0 {
return tripperware.SampleStream{}, false
}
return result, true
}
func (e *Extent) toResponse() (tripperware.Response, error) {
msg, err := types.EmptyAny(e.Response)
if err != nil {
return nil, err
}
if err := types.UnmarshalAny(e.Response, msg); err != nil {
return nil, err
}
resp, ok := msg.(tripperware.Response)
if !ok {
return nil, fmt.Errorf("bad cached type")
}
return resp, nil
}