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instance.go
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instance.go
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package ingester
import (
"context"
"sync"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/cortexproject/cortex/pkg/ingester/client"
"github.com/cortexproject/cortex/pkg/ingester/index"
cutil "github.com/cortexproject/cortex/pkg/util"
"github.com/grafana/loki/pkg/helpers"
"github.com/grafana/loki/pkg/iter"
"github.com/grafana/loki/pkg/logproto"
"github.com/grafana/loki/pkg/logql"
"github.com/grafana/loki/pkg/querier"
"github.com/grafana/loki/pkg/util"
)
const queryBatchSize = 128
// Errors returned on Query.
var (
ErrStreamMissing = errors.New("Stream missing")
)
var (
streamsCreatedTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "ingester_streams_created_total",
Help: "The total number of streams created per tenant.",
}, []string{"tenant"})
streamsRemovedTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "loki",
Name: "ingester_streams_removed_total",
Help: "The total number of streams removed per tenant.",
}, []string{"tenant"})
)
type instance struct {
streamsMtx sync.RWMutex
streams map[model.Fingerprint]*stream
index *index.InvertedIndex
instanceID string
streamsCreatedTotal prometheus.Counter
streamsRemovedTotal prometheus.Counter
blockSize int
}
func newInstance(instanceID string, blockSize int) *instance {
return &instance{
streams: map[model.Fingerprint]*stream{},
index: index.New(),
instanceID: instanceID,
streamsCreatedTotal: streamsCreatedTotal.WithLabelValues(instanceID),
streamsRemovedTotal: streamsRemovedTotal.WithLabelValues(instanceID),
blockSize: blockSize,
}
}
func (i *instance) Push(ctx context.Context, req *logproto.PushRequest) error {
i.streamsMtx.Lock()
defer i.streamsMtx.Unlock()
var appendErr error
for _, s := range req.Streams {
labels, err := util.ToClientLabels(s.Labels)
if err != nil {
appendErr = err
continue
}
fp := client.FastFingerprint(labels)
stream, ok := i.streams[fp]
if !ok {
stream = newStream(fp, labels, i.blockSize)
i.index.Add(labels, fp)
i.streams[fp] = stream
i.streamsCreatedTotal.Inc()
}
if err := stream.Push(ctx, s.Entries); err != nil {
appendErr = err
continue
}
}
return appendErr
}
func (i *instance) Query(req *logproto.QueryRequest, queryServer logproto.Querier_QueryServer) error {
expr, err := logql.ParseExpr(req.Query)
if err != nil {
return err
}
if req.Regex != "" {
expr = logql.NewFilterExpr(expr, labels.MatchRegexp, req.Regex)
}
querier := logql.QuerierFunc(func(matchers []*labels.Matcher) (iter.EntryIterator, error) {
iters, err := i.lookupStreams(req, matchers)
if err != nil {
return nil, err
}
return iter.NewHeapIterator(iters, req.Direction), nil
})
iter, err := expr.Eval(querier)
if err != nil {
return err
}
defer helpers.LogError("closing iterator", iter.Close)
return sendBatches(iter, queryServer, req.Limit)
}
func (i *instance) Label(ctx context.Context, req *logproto.LabelRequest) (*logproto.LabelResponse, error) {
var labels []string
if req.Values {
values := i.index.LabelValues(req.Name)
labels = make([]string, len(values))
for i := 0; i < len(values); i++ {
labels[i] = values[i]
}
} else {
names := i.index.LabelNames()
labels = make([]string, len(names))
for i := 0; i < len(names); i++ {
labels[i] = names[i]
}
}
return &logproto.LabelResponse{
Values: labels,
}, nil
}
func (i *instance) lookupStreams(req *logproto.QueryRequest, matchers []*labels.Matcher) ([]iter.EntryIterator, error) {
i.streamsMtx.RLock()
defer i.streamsMtx.RUnlock()
filters, matchers := cutil.SplitFiltersAndMatchers(matchers)
ids := i.index.Lookup(matchers)
iterators := make([]iter.EntryIterator, 0, len(ids))
outer:
for _, streamID := range ids {
stream, ok := i.streams[streamID]
if !ok {
return nil, ErrStreamMissing
}
lbs := client.FromLabelAdaptersToLabels(stream.labels)
for _, filter := range filters {
if !filter.Matches(lbs.Get(filter.Name)) {
continue outer
}
}
iter, err := stream.Iterator(req.Start, req.End, req.Direction)
if err != nil {
return nil, err
}
iterators = append(iterators, iter)
}
return iterators, nil
}
func isDone(ctx context.Context) bool {
select {
case <-ctx.Done():
return true
default:
return false
}
}
func sendBatches(i iter.EntryIterator, queryServer logproto.Querier_QueryServer, limit uint32) error {
sent := uint32(0)
for sent < limit && !isDone(queryServer.Context()) {
batch, batchSize, err := querier.ReadBatch(i, helpers.MinUint32(queryBatchSize, limit-sent))
if err != nil {
return err
}
sent += batchSize
if len(batch.Streams) == 0 {
return nil
}
if err := queryServer.Send(batch); err != nil {
return err
}
}
return nil
}