Vamshi Surabhi ce243f5899 multiplexed subscriptions (#1934) ... * add types to represent unparsed http gql requests This will help when we add caching of frequently used ASTs * query plan caching * move livequery to execute * add multiplexed module * session variable can be customised depending on the context Previously the value was always "current_setting('hasura.user')" * get rid of typemap requirement in reusable plan * subscriptions are multiplexed when possible * use lazytx for introspection to avoid acquiring a pg connection * refactor to make execute a completely decoupled module * don't issue a transaction for a query * don't use current setting for explained sql * move postgres related types to a different module * validate variableValues on postgres before multiplexing subs * don't user current_setting for queries over ws * plan_cache is only visible when developer flag is enabled * introduce 'batch size' when multiplexing subscriptions * bump stackage to 13.16 * fix schema_stitching test case error code * store hashes instead of actual responses for subscriptions * internal api to dump subscriptions state * remove PlanCache from SchemaCacheRef * allow live query options to be configured on server startup * capture metrics for multiplexed subscriptions * more metrics captured for multiplexed subs * switch to tvar based hashmap for faster snapshotting * livequery modules do not expose internal details * fix typo in live query env vars * switch to hasura's pg-client-hs		2019-04-17 15:18:41 +05:30
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Extended.hs	multiplexed subscriptions (#1934)	2019-04-17 15:18:41 +05:30