Make all store/db interactions async #6194
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Instead of reexporting from the graph crate, declare tokio once in the workspace and use it as needed
We need to make sure that all tests usea single runtime. See the comment on TEST_RUNTIME for why that's needed
That ensures that all tests use the same runtime, and we therefore don't have issues with closed connections because a second runtime was dropped.
The test assumed that the chain is in the primary, which is not necessarily true when tests are run against a sharded setup
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deadpool seems to get much more use and is udated more frequently. It also provides better insights on various size etc. metrics
For now, this is just a copy of AsyncDieselConnectionManager
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We have a lot of places where we do blocking database work from a non-blocking tokio task. This PR addresses this longstanding issue by using async database connections and
diesel_async. With that, we don't need to rely on error-prone approaches that require spawning blocking tasks whenever we do database work.Most of this PR is concerned with sprinkling async/await throughout the code base. There are a lot of commits, but most of them are boring, and I tried to structure it so that many of them just add async/await in a few places to make them easy to review individually.
Since switching to async connections also requires changing the connection pool, towards the end of the PR there are changes to recreate the instrumentation we had with r2d2 with deadpool.
There are still places in the codebase where
spawn_blockingis used, but those can be removed in separate PR's as this one is already crazy long. My apologies to the reviewer(s)I made sure that
cargo checkpassed after each commit; in addition, I ran CI after every few (say 5-10) commits and made sure that passed, too, up to the commit markedSQUASH FROM HEREas it was not possible to pass CI from that point on untilCI PASSES AGAINas theAsyncConnectionWrapperusesblock_onfor db interactions, and too many of them happen on the main tokio threads. For those, tokio panics as you are not allowed to useblock_onon those threads.Fixes #905