implement tenants endpoint for victorialogs

app/vlselect/internalselect/internalselect.go

@@ -2,6 +2,7 @@ package internalselect
 
 import (
 	"context"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"net/http"
@@ -85,6 +86,7 @@ var requestHandlers = map[string]func(ctx context.Context, w http.ResponseWriter
 	"/internal/delete/run_task":            processDeleteRunTask,
 	"/internal/delete/stop_task":           processDeleteStopTask,
 	"/internal/delete/active_tasks":        processDeleteActiveTasks,
+	"/internal/select/tenant_ids":          processTenantIDsRequest,
 }
 
 func processQueryRequest(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
@@ -375,6 +377,41 @@ func processDeleteActiveTasks(ctx context.Context, w http.ResponseWriter, r *htt
 	return nil
 }
 
+func processTenantIDsRequest(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
+	start, err := getInt64FromRequest(r, "start")
+	if err != nil {
+		return err
+	}
+	end, err := getInt64FromRequest(r, "end")
+	if err != nil {
+		return err
+	}
+
+	disableCompression := false
+	if err := getBoolFromRequest(&disableCompression, r, "disable_compression"); err != nil {
+		return err
+	}
+
+	tenantIDs, err := vlstorage.GetTenantIDs(ctx, start, end)
+	if err != nil {
+		return fmt.Errorf("cannot obtain tenant IDs: %w", err)
+	}
+
+	// Marshal tenantIDs at first
+	b, err := json.Marshal(tenantIDs)
+	if err != nil {
+		return fmt.Errorf("cannot marshal tenantIDs: %w", err)
+	}
+	if !disableCompression {
+		b = zstd.CompressLevel(nil, b, 1)
+	}
+	w.Header().Set("Content-Type", "application/json")
+	if _, err := w.Write(b); err != nil {
+		return fmt.Errorf("cannot send response to the client: %w", err)
+	}
+	return nil
+}
+
 type commonParams struct {
 	TenantIDs []logstorage.TenantID
 	Query     *logstorage.Query

app/vlselect/logsql/logsql.go

@@ -2,6 +2,7 @@ package logsql
 
 import (
 	"context"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
@@ -1073,6 +1074,53 @@ func ProcessQueryRequest(ctx context.Context, w http.ResponseWriter, r *http.Req
 	writeResponseHeadersOnce()
 }
 
+// ProcessAdminTenantsRequest processes /select/tenant_ids request.
+func ProcessAdminTenantsRequest(ctx context.Context, w http.ResponseWriter, r *http.Request) {
+	start, okStart, err := getTimeNsec(r, "start")
+	if err != nil {
+		httpserver.Errorf(w, r, "%s", err)
+		return
+	}
+	end, okEnd, err := getTimeNsec(r, "end")
+	if err != nil {
+		httpserver.Errorf(w, r, "%s", err)
+		return
+	}
+	if !okStart {
+		start = math.MinInt64
+	}
+	if !okEnd {
+		end = math.MaxInt64
+	}
+
+	if start > end {
+		httpserver.Errorf(w, r, "'start' time must be less than 'end' time")
+		return
+	}
+
+	tenants, err := vlstorage.GetTenantIDs(ctx, start, end)
+	if err != nil {
+		httpserver.Errorf(w, r, "cannot obtain tenantIDs: %s", err)
+		return
+	}
+
+	t, err := json.Marshal(tenants)
+	if err != nil {
+		httpserver.Errorf(w, r, "cannot marshal tenantIDs to JSON: %s", err)
+		return
+	}
+
+	// Write response header
+	h := w.Header()
+
+	h.Set("Content-Type", "application/json")
+
+	if _, err := w.Write(t); err != nil {
+		httpserver.Errorf(w, r, "cannot send response to the client: %s", err)
+		return
+	}
+}
+
 type syncWriter struct {
 	mu sync.Mutex
 	w  io.Writer

app/vlselect/main.go

@@ -303,6 +303,10 @@ func processSelectRequest(ctx context.Context, w http.ResponseWriter, r *http.Re
 		logsql.ProcessStreamsRequest(ctx, w, r)
 		logsqlStreamsDuration.UpdateDuration(startTime)
 		return true
+	case "/select/tenant_ids":
+		logsqlAdminTenantsRequests.Inc()
+		logsql.ProcessAdminTenantsRequest(ctx, w, r)
+		return true
 	default:
 		return false
 	}
@@ -437,4 +441,6 @@ var (
 	deleteRunTaskRequests     = metrics.NewCounter(`vl_http_requests_total{path="/delete/run_task"}`)
 	deleteStopTaskRequests    = metrics.NewCounter(`vl_http_requests_total{path="/delete/stop_task"}`)
 	deleteActiveTasksRequests = metrics.NewCounter(`vl_http_requests_total{path="/delete/active_tasks"}`)
+
+	logsqlAdminTenantsRequests = metrics.NewCounter(`vl_http_requests_total{path="/select/tenant_ids"}`)
 )

app/vlstorage/main.go

@@ -568,6 +568,14 @@ func DeleteActiveTasks(ctx context.Context) ([]*logstorage.DeleteTask, error) {
 	return netstorageSelect.DeleteActiveTasks(ctx)
 }
 
+// GetTenantIDs returns tenantIDs from the storage by the given start and end.
+func GetTenantIDs(ctx context.Context, start, end int64) ([]logstorage.TenantID, error) {
+	if localStorage != nil {
+		return localStorage.GetTenantIDs(ctx, start, end)
+	}
+	return netstorageSelect.GetTenantIDs(ctx, start, end)
+}
+
 func writeStorageMetrics(w io.Writer, strg *logstorage.Storage) {
 	var ss logstorage.StorageStats
 	strg.UpdateStats(&ss)

app/vlstorage/netselect/netselect.go

@@ -2,6 +2,7 @@ package netselect
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -245,6 +246,22 @@ func (sn *storageNode) getStreamIDs(qctx *logstorage.QueryContext, limit uint64)
 	return sn.getValuesWithHits(qctx, "/internal/select/stream_ids", args)
 }
 
+func (sn *storageNode) getTenantIDs(ctx context.Context, start, end int64) ([]logstorage.TenantID, error) {
+	args := url.Values{}
+	args.Set("start", fmt.Sprintf("%d", start))
+	args.Set("end", fmt.Sprintf("%d", end))
+	args.Set("disable_compression", fmt.Sprintf("%v", sn.s.disableCompression))
+	b, err := sn.getResponseForPathAndArgs(ctx, "/internal/select/tenant_ids", args)
+	if err != nil {
+		return nil, err
+	}
+	var tIDs []logstorage.TenantID
+	if err := json.Unmarshal(b, &tIDs); err != nil {
+		return nil, fmt.Errorf("cannot unmarshal tenant IDs from %q: %w", b, err)
+	}
+	return tIDs, nil
+}
+
 func (sn *storageNode) getCommonArgs(version string, qctx *logstorage.QueryContext) url.Values {
 	// ATTENTION: the *ProtocolVersion consts must be incremented every time the set of common args changes or its format changes.
 
@@ -563,6 +580,55 @@ func (s *Storage) DeleteActiveTasks(ctx context.Context) ([]*logstorage.DeleteTa
 	return tasks, nil
 }
 
+// GetTenantIDs returns tenantIDs for the given start and end.
+func (s *Storage) GetTenantIDs(ctx context.Context, start, end int64) ([]logstorage.TenantID, error) {
+	return s.getTenantIDs(ctx, start, end)
+}
+
+func (s *Storage) getTenantIDs(ctx context.Context, start, end int64) ([]logstorage.TenantID, error) {
+	ctxWithCancel, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	results := make([][]logstorage.TenantID, len(s.sns))
+	errs := make([]error, len(s.sns))
+
+	var wg sync.WaitGroup
+	for i := range s.sns {
+		wg.Add(1)
+		go func(nodeIdx int) {
+			defer wg.Done()
+
+			sn := s.sns[nodeIdx]
+			tenantIDs, err := sn.getTenantIDs(ctxWithCancel, start, end)
+			results[nodeIdx] = tenantIDs
+			errs[nodeIdx] = err
+			if err != nil {
+				// Cancel the remaining parallel requests
+				cancel()
+			}
+		}(i)
+	}
+	wg.Wait()
+	if err := getFirstError(errs, false); err != nil {
+		return nil, err
+	}
+
+	unique := make(map[logstorage.TenantID]struct{})
+	for _, tenants := range results {
+		// Deduplicate tenantIDs
+		for _, tenant := range tenants {
+			unique[tenant] = struct{}{}
+		}
+	}
+
+	tenantIDs := make([]logstorage.TenantID, 0, len(unique))
+	for key := range unique {
+		tenantIDs = append(tenantIDs, key)
+	}
+
+	return tenantIDs, nil
+}
+
 func (s *Storage) getValuesWithHits(qctx *logstorage.QueryContext, limit uint64, resetHitsOnLimitExceeded bool,
 	callback func(ctx context.Context, sn *storageNode) ([]logstorage.ValueWithHits, error)) ([]logstorage.ValueWithHits, error) {
 

lib/logstorage/indexdb_test.go

@@ -112,7 +112,7 @@ func TestStorageSearchStreamIDs(t *testing.T) {
 	// non-existing-tag-re
 	f(`{job="job-0",instance="instance-0",non_existing_tag=~"foo.+"}`, nil)
 
-	//non-existing-non-empty-tag-re
+	// non-existing-non-empty-tag-re
 	f(`{job="job-0",instance="instance-0",non_existing_tag!~""}`, nil)
 
 	// match-job-instance