Postgrex / CockroachDB connection stopped working

Man. No idea what’s going on.

Somehow, a very stable postgrex config just seemed to stop working.

I isolated it to a new, empty project to test config…

I can connect to cockroach db via psql no problem, but no so much via postgrex.

config = [
  username: System.get_env("CDB_USERNAME"),
  password: System.get_env("CDB_PASSWORD"),
  database: System.get_env("CDB_DATABASE"),
  parameters: [options: System.get_env("CDB_OPTIONS")],
  hostname: System.get_env("CDB_HOSTNAME"),
  port: String.to_integer(System.get_env("CDB_PORT")),
  ssl: [cacertfile: Path.expand("priv/certs/ca-cert.crt")],
  stacktrace: true,
  show_sensitive_data_on_connection_error: true
]

[
  username: "*******",
  password: "**************",
  database: "************",
  parameters: [options: "--cluster=*****"],
  hostname: "*****.aws-us-east-1.cockroachlabs.cloud",
  port: 26257,
  ssl: [cacertfile: "/Users/***/dev/***/***/priv/certs/ca-cert.crt"],
  stacktrace: true,
  show_sensitive_data_on_connection_error: true
]

Postgrex.start_link(config)

I get this error:

{:ok, #PID<0.215.0>}

15:40:42.385 [error] :gen_statem #PID<0.217.0> terminating
** (ArgumentError) errors were found at the given arguments:

  * 1st argument: not a binary

    (stdlib 6.2) :binary.copy(nil)
    (postgrex 0.19.3) lib/postgrex/types.ex:137: Postgrex.Types.build_type_info/1
    (postgrex 0.19.3) lib/postgrex/protocol.ex:1134: Postgrex.Protocol.bootstrap_recv/4
    (postgrex 0.19.3) lib/postgrex/protocol.ex:729: Postgrex.Protocol.handshake/3
    (postgrex 0.19.3) lib/postgrex/protocol.ex:209: Postgrex.Protocol.connect_endpoints/6
    (db_connection 2.7.0) lib/db_connection/connection.ex:74: DBConnection.Connection.handle_event/4
    (stdlib 6.2) gen_statem.erl:3737: :gen_statem.loop_state_callback/11
    (stdlib 6.2) proc_lib.erl:329: :proc_lib.init_p_do_apply/3
Queue: [internal: {:connect, :init}]
Postponed: []
State: Postgrex.Protocol
Callback mode: :handle_event_function, state_enter: false

I’ve confirmed that the all the envs are fine, I also used env vars to connect via psql. Also, the cert file is readable, if I change that I get a cert file error.

Any thoughts or clue as to how to troubleshoot would be most appreciated!

As I said, this has been stable for months. I have no idea what could have changed.