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ingester_querier.go
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ingester_querier.go
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package querier
import (
"context"
"net/http"
"strings"
"time"
cortex_distributor "github.com/cortexproject/cortex/pkg/distributor"
"github.com/cortexproject/cortex/pkg/ring"
ring_client "github.com/cortexproject/cortex/pkg/ring/client"
util_log "github.com/cortexproject/cortex/pkg/util/log"
"github.com/cortexproject/cortex/pkg/util/services"
"github.com/pkg/errors"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/weaveworks/common/httpgrpc"
"github.com/grafana/loki/pkg/ingester/client"
"github.com/grafana/loki/pkg/iter"
"github.com/grafana/loki/pkg/logproto"
"github.com/grafana/loki/pkg/logql"
"github.com/grafana/loki/pkg/logql/stats"
)
type responseFromIngesters struct {
addr string
response interface{}
}
// IngesterQuerier helps with querying the ingesters.
type IngesterQuerier struct {
ring ring.ReadRing
pool *ring_client.Pool
extraQueryDelay time.Duration
}
func NewIngesterQuerier(clientCfg client.Config, ring ring.ReadRing, extraQueryDelay time.Duration) (*IngesterQuerier, error) {
factory := func(addr string) (ring_client.PoolClient, error) {
return client.New(clientCfg, addr)
}
return newIngesterQuerier(clientCfg, ring, extraQueryDelay, factory)
}
// newIngesterQuerier creates a new IngesterQuerier and allows to pass a custom ingester client factory
// used for testing purposes
func newIngesterQuerier(clientCfg client.Config, ring ring.ReadRing, extraQueryDelay time.Duration, clientFactory ring_client.PoolFactory) (*IngesterQuerier, error) {
iq := IngesterQuerier{
ring: ring,
pool: cortex_distributor.NewPool(clientCfg.PoolConfig, ring, clientFactory, util_log.Logger),
extraQueryDelay: extraQueryDelay,
}
err := services.StartAndAwaitRunning(context.Background(), iq.pool)
if err != nil {
return nil, errors.Wrap(err, "querier pool")
}
return &iq, nil
}
// forAllIngesters runs f, in parallel, for all ingesters
// TODO taken from Cortex, see if we can refactor out an usable interface.
func (q *IngesterQuerier) forAllIngesters(ctx context.Context, f func(logproto.QuerierClient) (interface{}, error)) ([]responseFromIngesters, error) {
replicationSet, err := q.ring.GetReplicationSetForOperation(ring.Read)
if err != nil {
return nil, err
}
return q.forGivenIngesters(ctx, replicationSet, f)
}
// forGivenIngesters runs f, in parallel, for given ingesters
// TODO taken from Cortex, see if we can refactor out an usable interface.
func (q *IngesterQuerier) forGivenIngesters(ctx context.Context, replicationSet ring.ReplicationSet, f func(logproto.QuerierClient) (interface{}, error)) ([]responseFromIngesters, error) {
results, err := replicationSet.Do(ctx, q.extraQueryDelay, func(ctx context.Context, ingester *ring.InstanceDesc) (interface{}, error) {
client, err := q.pool.GetClientFor(ingester.Addr)
if err != nil {
return nil, err
}
resp, err := f(client.(logproto.QuerierClient))
if err != nil {
return nil, err
}
return responseFromIngesters{ingester.Addr, resp}, nil
})
if err != nil {
return nil, err
}
responses := make([]responseFromIngesters, 0, len(results))
for _, result := range results {
responses = append(responses, result.(responseFromIngesters))
}
return responses, err
}
func (q *IngesterQuerier) SelectLogs(ctx context.Context, params logql.SelectLogParams) ([]iter.EntryIterator, error) {
resps, err := q.forAllIngesters(ctx, func(client logproto.QuerierClient) (interface{}, error) {
return client.Query(ctx, params.QueryRequest, stats.CollectTrailer(ctx))
})
if err != nil {
return nil, err
}
iterators := make([]iter.EntryIterator, len(resps))
for i := range resps {
iterators[i] = iter.NewQueryClientIterator(resps[i].response.(logproto.Querier_QueryClient), params.Direction)
}
return iterators, nil
}
func (q *IngesterQuerier) SelectSample(ctx context.Context, params logql.SelectSampleParams) ([]iter.SampleIterator, error) {
resps, err := q.forAllIngesters(ctx, func(client logproto.QuerierClient) (interface{}, error) {
return client.QuerySample(ctx, params.SampleQueryRequest, stats.CollectTrailer(ctx))
})
if err != nil {
return nil, err
}
iterators := make([]iter.SampleIterator, len(resps))
for i := range resps {
iterators[i] = iter.NewSampleQueryClientIterator(resps[i].response.(logproto.Querier_QuerySampleClient))
}
return iterators, nil
}
func (q *IngesterQuerier) Label(ctx context.Context, req *logproto.LabelRequest) ([][]string, error) {
resps, err := q.forAllIngesters(ctx, func(client logproto.QuerierClient) (interface{}, error) {
return client.Label(ctx, req)
})
if err != nil {
return nil, err
}
results := make([][]string, 0, len(resps))
for _, resp := range resps {
results = append(results, resp.response.(*logproto.LabelResponse).Values)
}
return results, nil
}
func (q *IngesterQuerier) Tail(ctx context.Context, req *logproto.TailRequest) (map[string]logproto.Querier_TailClient, error) {
resps, err := q.forAllIngesters(ctx, func(client logproto.QuerierClient) (interface{}, error) {
return client.Tail(ctx, req)
})
if err != nil {
return nil, err
}
tailClients := make(map[string]logproto.Querier_TailClient)
for i := range resps {
tailClients[resps[i].addr] = resps[i].response.(logproto.Querier_TailClient)
}
return tailClients, nil
}
func (q *IngesterQuerier) TailDisconnectedIngesters(ctx context.Context, req *logproto.TailRequest, connectedIngestersAddr []string) (map[string]logproto.Querier_TailClient, error) {
// Build a map to easily check if an ingester address is already connected
connected := make(map[string]bool)
for _, addr := range connectedIngestersAddr {
connected[addr] = true
}
// Get the current replication set from the ring
replicationSet, err := q.ring.GetReplicationSetForOperation(ring.Read)
if err != nil {
return nil, err
}
// Look for disconnected ingesters or new one we should (re)connect to
reconnectIngesters := []ring.InstanceDesc{}
for _, ingester := range replicationSet.Ingesters {
if _, ok := connected[ingester.Addr]; ok {
continue
}
// Skip ingesters which are leaving or joining the cluster
if ingester.State != ring.ACTIVE {
continue
}
reconnectIngesters = append(reconnectIngesters, ingester)
}
if len(reconnectIngesters) == 0 {
return nil, nil
}
// Instance a tail client for each ingester to re(connect)
reconnectClients, err := q.forGivenIngesters(ctx, ring.ReplicationSet{Ingesters: reconnectIngesters}, func(client logproto.QuerierClient) (interface{}, error) {
return client.Tail(ctx, req)
})
if err != nil {
return nil, err
}
reconnectClientsMap := make(map[string]logproto.Querier_TailClient)
for _, client := range reconnectClients {
reconnectClientsMap[client.addr] = client.response.(logproto.Querier_TailClient)
}
return reconnectClientsMap, nil
}
func (q *IngesterQuerier) Series(ctx context.Context, req *logproto.SeriesRequest) ([][]logproto.SeriesIdentifier, error) {
resps, err := q.forAllIngesters(ctx, func(client logproto.QuerierClient) (interface{}, error) {
return client.Series(ctx, req)
})
if err != nil {
return nil, err
}
var acc [][]logproto.SeriesIdentifier
for _, resp := range resps {
acc = append(acc, resp.response.(*logproto.SeriesResponse).Series)
}
return acc, nil
}
func (q *IngesterQuerier) TailersCount(ctx context.Context) ([]uint32, error) {
replicationSet, err := q.ring.GetAllHealthy(ring.Read)
if err != nil {
return nil, err
}
// we want to check count of active tailers with only active ingesters
ingesters := make([]ring.InstanceDesc, 0, 1)
for i := range replicationSet.Ingesters {
if replicationSet.Ingesters[i].State == ring.ACTIVE {
ingesters = append(ingesters, replicationSet.Ingesters[i])
}
}
if len(ingesters) == 0 {
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "no active ingester found")
}
responses, err := q.forGivenIngesters(ctx, replicationSet, func(querierClient logproto.QuerierClient) (interface{}, error) {
resp, err := querierClient.TailersCount(ctx, nil)
if err != nil {
return nil, err
}
return resp.Count, nil
})
// We are only checking active ingesters, and any error returned stops checking other ingesters
// so return that error here as well.
if err != nil {
return nil, err
}
counts := make([]uint32, len(responses))
for _, resp := range responses {
counts = append(counts, resp.response.(uint32))
}
return counts, nil
}
func (q *IngesterQuerier) GetChunkIDs(ctx context.Context, from, through model.Time, matchers ...*labels.Matcher) ([]string, error) {
resps, err := q.forAllIngesters(ctx, func(querierClient logproto.QuerierClient) (interface{}, error) {
return querierClient.GetChunkIDs(ctx, &logproto.GetChunkIDsRequest{
Matchers: convertMatchersToString(matchers),
Start: from.Time(),
End: through.Time(),
})
})
if err != nil {
return nil, err
}
var chunkIDs []string
for i := range resps {
chunkIDs = append(chunkIDs, resps[i].response.(*logproto.GetChunkIDsResponse).ChunkIDs...)
}
return chunkIDs, nil
}
func convertMatchersToString(matchers []*labels.Matcher) string {
out := strings.Builder{}
out.WriteRune('{')
for idx, m := range matchers {
if idx > 0 {
out.WriteRune(',')
}
out.WriteString(m.String())
}
out.WriteRune('}')
return out.String()
}