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Host filter #567

Merged
merged 6 commits into from Oct 4, 2022
Merged

Host filter #567

merged 6 commits into from Oct 4, 2022

Commits on Oct 4, 2022

  1. transport: add the host_filter module 

    Introduces the host_filter module. Host filters will be used for
restricting the set of nodes towards which the driver should open
connections. The following filters are implemented for the time being:

- AcceptAllHostFilter: accepts all nodes,
- AllowListHostFilter: only nodes from the provided list are accepted,
- DcHostfilter: only nodes from given DC are accepted.
    @piodul
    piodul committed Oct 4, 2022
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  2. {session,session_config}: add host filter to session builder and config 

    Now, it is possible to provide a HostFilter for a Session via
SessionConfig or SessionBuilder.
    @piodul
    piodul committed Oct 4, 2022
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  3. node: make it possible to disable node's pool 

    In order to make host filters effective the connection pool in Node is
wrapped in an optional. Nodes disabled by the session's host filters
will have the connection pool set to None.
    @piodul
    piodul committed Oct 4, 2022
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  4. cluster: use host filter by cluster worker 

    Now, on topology refresh, nodes that are not accepted by the host
filtered are created in disabled mode, i.e. they do not create a
connection pool and do not establish any connections to the node.
    @piodul
    piodul committed Oct 4, 2022
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  5. topology: filter hosts for the control connection 

    Now, the control connection is aware of the host filter and carefully
tries to omit filtered out nodes.

If the initial nodes list contained a node that is not accepted by the
host filter and a control connection has been established to it, a
warning will be printed and the driver will try to re-establish it to
one of the accepted nodes.

Additionally, in case of a mistake where an incorrect host filter is
provided and all nodes are filtered out, a message is printed which
points out the problem.
    @piodul
    piodul committed Oct 4, 2022
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  6. lib.rs: re-export transport::host_filter for convenience

    @piodul
    piodul committed Oct 4, 2022
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