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Prevent crash while executing concurrent mixed queries (#874) 

limit parallel query execution to 1 at a time
This commit is contained in:
Michael Mandrus 2023-05-18 10:25:20 -04:00 committed by Horst Gutmann
parent f4c04d4055
commit f1178e0b81
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1 changed files with 4 additions and 1 deletions
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5
pkg/services/query/query.go
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@ -101,7 +101,10 @@ func (s *ServiceImpl) QueryData(ctx context.Context, user *user.SignedInUser, sk
// executeConcurrentQueries executes queries to multiple datasources concurrently and returns the aggregate result.
func (s *ServiceImpl) executeConcurrentQueries(ctx context.Context, user *user.SignedInUser, skipDSCache bool, reqDTO dtos.MetricRequest, queriesbyDs map[string][]parsedQuery) (*backend.QueryDataResponse, error) {
g, ctx := errgroup.WithContext(ctx)
g.SetLimit(8) // arbitrary limit to prevent too many concurrent requests
// TODO: Temporarily limiting concurrency here to 1 to avoid concurrent map writes in the plugin middleware that crash the app
// This is a workaround to mitigate the security issue. We will implement a more thread-safe way of handling concurrent queries as a next step.
g.SetLimit(1)
// g.SetLimit(8) // arbitrary limit to prevent too many concurrent requests
rchan := make(chan backend.Responses, len(queriesbyDs))
// Create panic recovery function for loop below