Returning custom grpc code when reaching series/chunk limits (thanos-…

…io#3903)

Signed-off-by: Alan Protasio <[email protected]>

CHANGELOG.md

@@ -13,6 +13,7 @@ We use _breaking :warning:_ to mark changes that are not backward compatible (re
 ## Unreleased
 
 ### Added
+- [#3903](https://github.com/thanos-io/thanos/pull/3903) Store: Returning custom grpc code when reaching series/chunk limits.
 
 ### Fixed
 - [#3204](https://github.com/thanos-io/thanos/pull/3204) Mixin: Use sidecar's metric timestamp for healthcheck.

pkg/store/bucket.go

@@ -1026,7 +1026,11 @@ func (s *BucketStore) Series(req *storepb.SeriesRequest, srv storepb.Store_Serie
 			err = g.Wait()
 		})
 		if err != nil {
-			return status.Error(codes.Aborted, err.Error())
+			code := codes.Aborted
+			if s, ok := status.FromError(errors.Cause(err)); ok {
+				code = s.Code()
+			}
+			return status.Error(code, err.Error())
 		}
 		stats.blocksQueried = len(res)
 		stats.getAllDuration = time.Since(begin)

pkg/store/bucket_e2e_test.go

@@ -14,10 +14,15 @@ import (
 	"time"
 
 	"github.com/go-kit/kit/log"
+	"github.com/gogo/status"
 	"github.com/oklog/ulid"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/prometheus/pkg/labels"
 	"github.com/prometheus/prometheus/pkg/relabel"
 	"github.com/prometheus/prometheus/pkg/timestamp"
+	"github.com/weaveworks/common/httpgrpc"
+	"google.golang.org/grpc/codes"
+
 	"github.com/thanos-io/thanos/pkg/block"
 	"github.com/thanos-io/thanos/pkg/block/metadata"
 	"github.com/thanos-io/thanos/pkg/model"
@@ -45,6 +50,20 @@ type swappableCache struct {
 	ptr storecache.IndexCache
 }
 
+type customLimiter struct {
+	limiter *Limiter
+	code    codes.Code
+}
+
+func (c *customLimiter) Reserve(num uint64) error {
+	err := c.limiter.Reserve(num)
+	if err != nil {
+		return httpgrpc.Errorf(int(c.code), err.Error())
+	}
+
+	return nil
+}
+
 func (c *swappableCache) SwapWith(ptr2 storecache.IndexCache) {
 	c.ptr = ptr2
 }
@@ -113,7 +132,25 @@ func prepareTestBlocks(t testing.TB, now time.Time, count int, dir string, bkt o
 	return
 }
 
-func prepareStoreWithTestBlocks(t testing.TB, dir string, bkt objstore.Bucket, manyParts bool, maxChunksLimit uint64, relabelConfig []*relabel.Config, filterConf *FilterConfig) *storeSuite {
+func newCustomChunksLimiterFactory(limit uint64, code codes.Code) ChunksLimiterFactory {
+	return func(failedCounter prometheus.Counter) ChunksLimiter {
+		return &customLimiter{
+			limiter: NewLimiter(limit, failedCounter),
+			code:    code,
+		}
+	}
+}
+
+func newCustomSeriesLimiterFactory(limit uint64, code codes.Code) SeriesLimiterFactory {
+	return func(failedCounter prometheus.Counter) SeriesLimiter {
+		return &customLimiter{
+			limiter: NewLimiter(limit, failedCounter),
+			code:    code,
+		}
+	}
+}
+
+func prepareStoreWithTestBlocks(t testing.TB, dir string, bkt objstore.Bucket, manyParts bool, chunksLimiterFactory ChunksLimiterFactory, seriesLimiterFactory SeriesLimiterFactory, relabelConfig []*relabel.Config, filterConf *FilterConfig) *storeSuite {
 	series := []labels.Labels{
 		labels.FromStrings("a", "1", "b", "1"),
 		labels.FromStrings("a", "1", "b", "2"),
@@ -151,8 +188,8 @@ func prepareStoreWithTestBlocks(t testing.TB, dir string, bkt objstore.Bucket, m
 		s.cache,
 		nil,
 		nil,
-		NewChunksLimiterFactory(maxChunksLimit),
-		NewSeriesLimiterFactory(0),
+		chunksLimiterFactory,
+		seriesLimiterFactory,
 		NewGapBasedPartitioner(PartitionerMaxGapSize),
 		false,
 		20,
@@ -425,7 +462,7 @@ func TestBucketStore_e2e(t *testing.T) {
 		testutil.Ok(t, err)
 		defer func() { testutil.Ok(t, os.RemoveAll(dir)) }()
 
-		s := prepareStoreWithTestBlocks(t, dir, bkt, false, 0, emptyRelabelConfig, allowAllFilterConf)
+		s := prepareStoreWithTestBlocks(t, dir, bkt, false, NewChunksLimiterFactory(0), NewSeriesLimiterFactory(0), emptyRelabelConfig, allowAllFilterConf)
 
 		if ok := t.Run("no index cache", func(t *testing.T) {
 			s.cache.SwapWith(noopCache{})
@@ -480,7 +517,7 @@ func TestBucketStore_ManyParts_e2e(t *testing.T) {
 		testutil.Ok(t, err)
 		defer func() { testutil.Ok(t, os.RemoveAll(dir)) }()
 
-		s := prepareStoreWithTestBlocks(t, dir, bkt, true, 0, emptyRelabelConfig, allowAllFilterConf)
+		s := prepareStoreWithTestBlocks(t, dir, bkt, true, NewChunksLimiterFactory(0), NewSeriesLimiterFactory(0), emptyRelabelConfig, allowAllFilterConf)
 
 		indexCache, err := storecache.NewInMemoryIndexCacheWithConfig(s.logger, nil, storecache.InMemoryIndexCacheConfig{
 			MaxItemSize: 1e5,
@@ -508,7 +545,7 @@ func TestBucketStore_TimePartitioning_e2e(t *testing.T) {
 	// The query will fetch 2 series from 2 blocks, so we do expect to hit a total of 4 chunks.
 	expectedChunks := uint64(2 * 2)
 
-	s := prepareStoreWithTestBlocks(t, dir, bkt, false, expectedChunks, emptyRelabelConfig, &FilterConfig{
+	s := prepareStoreWithTestBlocks(t, dir, bkt, false, NewChunksLimiterFactory(expectedChunks), NewSeriesLimiterFactory(0), emptyRelabelConfig, &FilterConfig{
 		MinTime: minTimeDuration,
 		MaxTime: filterMaxTime,
 	})
@@ -554,14 +591,28 @@ func TestBucketStore_Series_ChunksLimiter_e2e(t *testing.T) {
 
 	cases := map[string]struct {
 		maxChunksLimit uint64
+		maxSeriesLimit uint64
 		expectedErr    string
+		code           codes.Code
 	}{
 		"should succeed if the max chunks limit is not exceeded": {
 			maxChunksLimit: expectedChunks,
 		},
-		"should fail if the max chunks limit is exceeded": {
+		"should fail if the max chunks limit is exceeded - ResourceExhausted": {
 			maxChunksLimit: expectedChunks - 1,
 			expectedErr:    "exceeded chunks limit",
+			code:           codes.ResourceExhausted,
+		},
+		"should fail if the max chunks limit is exceeded - 422": {
+			maxChunksLimit: expectedChunks - 1,
+			expectedErr:    "exceeded chunks limit",
+			code:           422,
+		},
+		"should fail if the max series limit is exceeded - 422": {
+			maxChunksLimit: expectedChunks,
+			expectedErr:    "exceeded series limit",
+			maxSeriesLimit: 1,
+			code:           422,
 		},
 	}
 
@@ -575,7 +626,7 @@ func TestBucketStore_Series_ChunksLimiter_e2e(t *testing.T) {
 			testutil.Ok(t, err)
 			defer func() { testutil.Ok(t, os.RemoveAll(dir)) }()
 
-			s := prepareStoreWithTestBlocks(t, dir, bkt, false, testData.maxChunksLimit, emptyRelabelConfig, allowAllFilterConf)
+			s := prepareStoreWithTestBlocks(t, dir, bkt, false, newCustomChunksLimiterFactory(testData.maxChunksLimit, testData.code), newCustomSeriesLimiterFactory(testData.maxSeriesLimit, testData.code), emptyRelabelConfig, allowAllFilterConf)
 			testutil.Ok(t, s.store.SyncBlocks(ctx))
 
 			req := &storepb.SeriesRequest{
@@ -595,6 +646,9 @@ func TestBucketStore_Series_ChunksLimiter_e2e(t *testing.T) {
 			} else {
 				testutil.NotOk(t, err)
 				testutil.Assert(t, strings.Contains(err.Error(), testData.expectedErr))
+				status, ok := status.FromError(err)
+				testutil.Equals(t, true, ok)
+				testutil.Equals(t, testData.code, status.Code())
 			}
 		})
 	}
@@ -609,7 +663,7 @@ func TestBucketStore_LabelNames_e2e(t *testing.T) {
 		testutil.Ok(t, err)
 		defer func() { testutil.Ok(t, os.RemoveAll(dir)) }()
 
-		s := prepareStoreWithTestBlocks(t, dir, bkt, false, 0, emptyRelabelConfig, allowAllFilterConf)
+		s := prepareStoreWithTestBlocks(t, dir, bkt, false, NewChunksLimiterFactory(0), NewSeriesLimiterFactory(0), emptyRelabelConfig, allowAllFilterConf)
 
 		mint, maxt := s.store.TimeRange()
 		testutil.Equals(t, s.minTime, mint)
@@ -642,7 +696,7 @@ func TestBucketStore_LabelValues_e2e(t *testing.T) {
 		testutil.Ok(t, err)
 		defer func() { testutil.Ok(t, os.RemoveAll(dir)) }()
 
-		s := prepareStoreWithTestBlocks(t, dir, bkt, false, 0, emptyRelabelConfig, allowAllFilterConf)
+		s := prepareStoreWithTestBlocks(t, dir, bkt, false, NewChunksLimiterFactory(0), NewSeriesLimiterFactory(0), emptyRelabelConfig, allowAllFilterConf)
 
 		mint, maxt := s.store.TimeRange()
 		testutil.Equals(t, s.minTime, mint)