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Implement db-uri-read-replicas #3017

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Implement db-uri-read-replicas #3017

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Commits on Oct 27, 2023

  1. Implement db-uri-read-replicas 

    - takes a list of URIs to use as read replicas
- queries are routed based on the transaction mode,
  with read-mode queries going to the read replicas
  if any are configured
- we configure one pool per database uri, all with
  the same configuration
- which read replica to use is chosen randomly
- if you want the master to also be used for read-only
  queries, put it in both db-uri and db-uri-read-replicas

Test coverage is spotty and work-in-progress. It requires a
replicating setup which is not automated. With a locally set
up read replica, the integration test suite should pass as
follows:

PGHOSTREP='/tmp' PGPORTREP=5433 PGHOST='/tmp' PGPORT=5432 \
  postgrest-test-io

You can pass '-k test_readonly' for replication-specific tests.
    @robx
    robx committed Oct 27, 2023
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  2. shim the missing replica in integration tests

    @robx
    robx committed Oct 27, 2023
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    cdedf26 View commit details
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