Re: Patch: Implement failover on libpq connect level.

> Hello, Victor.
> 
> > I'm sending new version of patch.
> > 
> > I've replaced readonly option with target_server_type (with JDBC
> > compatibility alias targetServerType), 
> > 
> > use logic of setting defaults based on number of hosts in the connect
> > string instead of complicated condition in the state machine,
> > 
> > added checks for return values of memory allocation function.
> > 
> > Also, I've solved pg_usleep problem by linking pgsleep.c into libpq
> > along with some other libpgport objects which are already linked there.
> > 
> > Thus client applications don't need to link with libpgport and libpq
> > shared library is self-containted.
> 
> This patch doesn't apply to master branch:
> 
> ```
> $ git apply ~/temp/libpq-failover-8.patch
> /home/eax/temp/libpq-failover-8.patch:184: trailing whitespace.
> check: 
> /home/eax/temp/libpq-failover-8.patch:252: trailing whitespace.
> 	/* 
> /home/eax/temp/libpq-failover-8.patch:253: trailing whitespace.
> 	 *  Validate target_server_mode option 
> /home/eax/temp/libpq-failover-8.patch:254: trailing whitespace.
> 	 */ 
> /home/eax/temp/libpq-failover-8.patch:306: trailing whitespace.
> 			appendPQExpBuffer(&conn->errorMessage, 
> error: src/interfaces/libpq/t/001-multihost.pl: already exists in
> working directory
> 
> $ git diff
> ```

Oops. Sorry, my mistake. I forgot to check for untracked files.
Everything is fine.

-- 
Best regards,
Aleksander Alekseev