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The previous protocol expected a set of matching characters to check if a message sent was the last one or not, that changed depending on the destination wanted: - 't' and 'f' tracked the last message of a log sent to stderr. - 'T' and 'F' tracked the last message of a log sent to csvlog. This could be extended with more characters when introducing new destinations, but using a bitmask is much more elegant. This commit changes the protocol so as a bitmask is used in the header of a log chunk message sent to the syslogger, with the following options available for now: - log_destination as stderr. - log_destination as csvlog. - if a message is the last chunk of a message. Sehrope found this issue in a patch set to introduce JSON as an option for log_destination, but his patch made the size of the protocol header larger. This commit keeps the same size as the original, and adapts the protocol as wanted. Thanks also to Andrew Dunstan and Greg Stark for the discussion. Author: Michael Paquier, Sehrope Sarkuni Discussion: https://postgr.es/m/CAH7T-aqswBM6JWe4pDehi1uOiufqe06DJWaU5=X7dDLyqUExHg@mail.gmail.com |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.