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Allow pgoutput to send logical decoding messages.

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The output plugin accepts a new parameter (messages) that controls if
logical decoding messages are written into the replication stream. It is
useful for those clients that use pgoutput as an output plugin and needs
to process messages that were written by pg_logical_emit_message().

Although logical streaming replication protocol supports logical
decoding messages now, logical replication does not use this feature yet.

Author: David Pirotte, Euler Taveira
Reviewed-by: Euler Taveira, Andres Freund, Ashutosh Bapat, Amit Kapila
Discussion: https://postgr.es/m/CADK3HHJ-+9SO7KuRLH=9Wa1rAo60Yreq1GFNkH_kd0=CdaWM+A@mail.gmail.com
This commit is contained in:
Amit Kapila
2021-04-06 08:40:47 +05:30
parent 531737ddad
commit ac4645c015
7 changed files with 312 additions and 0 deletions
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9
src/backend/replication/logical/worker.c
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@@ -1939,6 +1939,15 @@ apply_dispatch(StringInfo s)
apply_handle_origin(s);
return;
case LOGICAL_REP_MSG_MESSAGE:
/*
* Logical replication does not use generic logical messages yet.
* Although, it could be used by other applications that use this
* output plugin.
*/
return;
case LOGICAL_REP_MSG_STREAM_START:
apply_handle_stream_start(s);
return;