Connections parameters overridden by hard-coded values

[Dov Murik]

It seems that function pglogical_connect_base overrides the values of the following connection-string parameters, if given by the user:

• connect_timeout
• keepalives
• keepalives_idle
• keepalives_interval
• keepalives_count

This means that as of pglogical 2.4.4 there's no way to change the value of these parameters for a pglogical connection.

For example, if I set connect_timeout to an illegal non-numeric value (zzzzzz) I get no error:

SELECT pglogical.create_subscription(
  subscription_name := 'sub1',
  provider_dsn := 'host=localhost port=5432 dbname=src user=repuser password=password123 connect_timeout=zzzzzz'
);

because the illegal value is overridden by the hard-coded value of 30 that appears in pglogical.c.

If I try using such illegal value for a parameter that is not overridden (such as tcp_user_timeout), I get the expected error message:

SELECT pglogical.create_subscription(
  subscription_name := 'sub1',
  provider_dsn := 'host=localhost port=5432 dbname=src user=repuser password=password123 tcp_user_timeout=zzzzzz'
);

ERROR:  could not connect to the postgresql server: connection to server at "localhost" (127.0.0.1), port 5432 failed: invalid integer value "zzzzzz" for connection option "tcp_user_timeout"
connection to server at "localhost" (::1), port 5432 failed: invalid integer value "zzzzzz" for connection option "tcp_user_timeout"

---

Related:

It is not clear to me where pglogical.extra_connection_options is used: it is appended to s here:

pglogical/pglogical.c

Lines 278 to 285 in bff71f2

 initStringInfo(&s); 
 appendStringInfoString(&s, pglogical_extra_connection_options); 
 appendStringInfoChar(&s, ' '); 
 appendStringInfoString(&s, connstr); 
  
 keys[i] = "dbname"; 
 vals[i] = connstr; 
 i++; 

but that s is never used. Maybe s.data should be used instead of connstr on line 284.