Function parseRequest

edgraph/server.go:1722–1773

parseRequest parses the incoming request

(ctx context.Context, qc *queryContext)

// parseRequest parses the incoming request
func parseRequest(ctx context.Context, qc *queryContext) error {
	start := time.Now()
	defer func() {
		qc.latency.Parsing = time.Since(start)
	}()

	var needVars []string
	upsertQuery := qc.req.Query
	if len(qc.req.Mutations) > 0 {
		// parsing mutations
		qc.gmuList = make([]*dql.Mutation, 0, len(qc.req.Mutations))
		for _, mu := range qc.req.Mutations {
			gmu, err := ParseMutationObject(ctx, mu)
			if err != nil {
				return err
			}

			qc.gmuList = append(qc.gmuList, gmu)
		}

		if err := addQueryIfUnique(ctx, qc); err != nil {
			return err
		}

		qc.uidRes = make(map[string][]string)
		qc.valRes = make(map[string]*types.ShardedMap)
		var err error
		upsertQuery, err = buildUpsertQuery(qc)
		if err != nil {
			return err
		}
		needVars = findMutationVars(qc)
		if upsertQuery == "" {
			if len(needVars) > 0 {
				return errors.Errorf("variables %v not defined", needVars)
			}

			return nil
		}
	}

	// parsing the updated query
	var err error
	qc.dqlRes, err = dql.ParseWithNeedVars(dql.Request{
		Str:       upsertQuery,
		Variables: qc.req.Vars,
	}, needVars)
	if err != nil {
		return err
	}
	return validateQuery(qc.dqlRes.Query)
}

// verifyUnique verifies uniqueness of mutation
func verifyUnique(qc *queryContext, qr query.Request) error {