fix(gql_websocket_link): Fix race condition causing exception and double complete #471
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Hi! I just merged #466, which now causes a merge conflict. Can you take a look please? |
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There is a race condition in the
subscribefunction of the _Client class. If the dispose function returned by thesubscribemethod is called which calls thereleaser()method, and then aCompleteMessageis received on the websocket while thereleaser()is awaiting to compose its ownCompleteMessage, thenreleaser()is called twice and the request is double released causing an exception. I've added a flag to avoid a double release.The second patch simply avoids the situation where a websocket is already closed when an error occurs, causing an already completed exception when
completeError()is called on the completer.