fix(txn): ensure that txn hash is set (#7782)

We were setting the hash after completing the transaction successfully. This leads to the failure of the commit as it won't contain the hash. This PR fixes that issue.

edgraph/server.go

@@ -1404,6 +1404,18 @@ func (s *Server) doQuery(ctx context.Context, req *Request) (
 		req.req.StartTs = worker.State.GetTimestamp(false)
 		qc.latency.AssignTimestamp = time.Since(start)
 	}
+	if x.WorkerConfig.AclEnabled {
+		ns, err := x.ExtractNamespace(ctx)
+		if err != nil {
+			return nil, err
+		}
+		defer func() {
+			if resp != nil && resp.Txn != nil {
+				// attach the hash, user must send this hash when further operating on this startTs.
+				resp.Txn.Hash = getHash(ns, resp.Txn.StartTs)
+			}
+		}()
+	}
 
 	var gqlErrs error
 	if resp, rerr = processQuery(ctx, qc); rerr != nil {
@@ -1437,14 +1449,6 @@ func (s *Server) doQuery(ctx context.Context, req *Request) (
 		EncodingNs:        uint64(l.Json.Nanoseconds()),
 		TotalNs:           uint64((time.Since(l.Start)).Nanoseconds()),
 	}
-	if x.WorkerConfig.AclEnabled {
-		// attach the hash, user should send this hash when further operating on this startTs.
-		ns, err := x.ExtractNamespace(ctx)
-		if err != nil {
-			return nil, err
-		}
-		resp.Txn.Hash = getHash(ns, resp.Txn.StartTs)
-	}
 	md := metadata.Pairs(x.DgraphCostHeader, fmt.Sprint(resp.Metrics.NumUids["_total"]))
 	grpc.SendHeader(ctx, md)
 	return resp, gqlErrs

worker/server_state.go

@@ -43,7 +43,6 @@ const (
 	CacheDefaults  = `size-mb=1024; percentage=0,65,35;`
 	CDCDefaults    = `file=; kafka=; sasl_user=; sasl_password=; ca_cert=; client_cert=; ` +
 		`client_key=; sasl-mechanism=PLAIN;`
-	CloudDefaults   = `disable-non-galaxy=false;`
 	GraphQLDefaults = `introspection=true; debug=false; extensions=true; poll-interval=1s; ` +
 		`lambda-url=;`
 	LimitDefaults = `mutations=allow; query-edge=1000000; normalize-node=10000; ` +