satellite/metabase: add unique unversioned constraint for tests

While the index shouldn't be necessary as long as our implementation is
correct, it still provides some additional checks for mistakes in the
implementation.

Change-Id: I7ed71ac99a979e375d7f94c8898e6f83ac623cb6

satellite/metabase/db.go

@@ -36,6 +36,8 @@ type Config struct {
 	// TODO remove this flag when server-side copy implementation will be finished
 	ServerSideCopy         bool
 	ServerSideCopyDisabled bool
+
+	TestingUniqueUnversioned bool
 }
 
 // DB implements a database for storing objects and segments.
@@ -306,18 +308,18 @@ func (db *DB) TestMigrateToLatest(ctx context.Context) error {
 						bucket_name  BYTEA NOT NULL,
 						object_key   BYTEA NOT NULL,
 						stream_id    BYTEA NOT NULL,
-					
+
 						created_at TIMESTAMPTZ NOT NULL default now(),
 						expires_at TIMESTAMPTZ,
-					
+
 						encrypted_metadata_nonce         BYTEA default NULL,
 						encrypted_metadata               BYTEA default NULL,
 						encrypted_metadata_encrypted_key BYTEA default NULL,
-					
+
 						encryption INT8 NOT NULL default 0,
-					
+
 						zombie_deletion_deadline TIMESTAMPTZ default now() + '1 day',
-					
+
 						PRIMARY KEY (project_id, bucket_name, object_key, stream_id)
 					)`,
 					`
@@ -341,6 +343,19 @@ func (db *DB) TestMigrateToLatest(ctx context.Context) error {
 			},
 		},
 	}
+
+	if db.config.TestingUniqueUnversioned {
+		// This is only part of testing, because we do not want to affect the production performance.
+		migration.Steps = append(migration.Steps, &migrate.Step{
+			DB:          &db.db,
+			Description: "Constraint for ensuring our metabase correctness.",
+			Version:     18,
+			Action: migrate.SQL{
+				`CREATE UNIQUE INDEX objects_one_unversioned_per_location ON objects (project_id, bucket_name, object_key) WHERE status IN ` + statusesUnversioned + `;`,
+			},
+		})
+	}
+
 	return migration.Run(ctx, db.log.Named("migrate"))
 }
 

satellite/metabase/db_test.go

@@ -4,12 +4,15 @@
 package metabase_test
 
 import (
+	"strconv"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/require"
 
 	"storj.io/common/testcontext"
+	"storj.io/common/testrand"
+	"storj.io/private/dbutil/pgutil/pgerrcode"
 	"storj.io/storj/satellite/metabase"
 	"storj.io/storj/satellite/metabase/metabasetest"
 )
@@ -22,3 +25,44 @@ func TestNow(t *testing.T) {
 		require.WithinDuration(t, sysnow, now, 5*time.Second)
 	})
 }
+
+func TestDisallowDoubleUnversioned(t *testing.T) {
+	metabasetest.Run(t, func(ctx *testcontext.Context, t *testing.T, db *metabase.DB) {
+		// This checks that TestingUniqueUnversioned=true indeed works as needed.
+		objStream := metabasetest.RandObjectStream()
+		obj := metabasetest.CreateObject(ctx, t, db, objStream, 0)
+
+		internaldb := db.UnderlyingTagSQL()
+		_, err := internaldb.Exec(ctx, `
+			INSERT INTO objects (
+				project_id, bucket_name, object_key, version, stream_id,
+				status
+			) VALUES (
+				$1, $2, $3, $4, $5,
+				`+strconv.Itoa(int(metabase.CommittedUnversioned))+`
+			)
+		`, obj.ProjectID, []byte(obj.BucketName), obj.ObjectKey, obj.Version+1, testrand.UUID(),
+		)
+		require.True(t, pgerrcode.IsConstraintViolation(err))
+		require.ErrorContains(t, err, "objects_one_unversioned_per_location")
+
+		_, err = internaldb.Exec(ctx, `
+			INSERT INTO objects (
+				project_id, bucket_name, object_key, version, stream_id,
+				status
+			) VALUES (
+				$1, $2, $3, $4, $5,
+				`+strconv.Itoa(int(metabase.DeleteMarkerUnversioned))+`
+			)
+		`, obj.ProjectID, []byte(obj.BucketName), obj.ObjectKey, obj.Version+1, testrand.UUID(),
+		)
+		require.True(t, pgerrcode.IsConstraintViolation(err))
+		require.ErrorContains(t, err, "objects_one_unversioned_per_location")
+
+		metabasetest.Verify{
+			Objects: []metabase.RawObject{
+				metabase.RawObject(obj),
+			},
+		}.Check(ctx, t, db)
+	})
+}

satellite/metabase/metabasetest/run.go

@@ -84,11 +84,14 @@ func Run(t *testing.T, fn func(ctx *testcontext.Context, t *testing.T, db *metab
 	)
 
 	RunWithConfig(t, metabase.Config{
-		ApplicationName:        "satellite-metabase-test",
-		MinPartSize:            config.MinPartSize,
-		MaxNumberOfParts:       config.MaxNumberOfParts,
+		ApplicationName:  "satellite-metabase-test",
+		MinPartSize:      config.MinPartSize,
+		MaxNumberOfParts: config.MaxNumberOfParts,
+
 		ServerSideCopy:         config.ServerSideCopy,
 		ServerSideCopyDisabled: config.ServerSideCopyDisabled,
+
+		TestingUniqueUnversioned: true,
 	}, fn)
 }