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In reference to:
http://archives.postgresql.org/message-id/6534f7ae0811181547v1dc1f096g6222e8273b461...@mail.gmail.com
Had to fix a lot of bit rot, but otherwise looks good. My updated patch
attached. Will commit in a day or so if no objections.
BTW, some commitfest procedural comments/questions:
1) I couldn't figure out how to attach my patch to the commitfest page
short of cut-n-paste into the small comment text box -- is that my only
choice?
2) It would be nice if the mail archive web page of the original message
had a "Reply To" button. Otherwise I guess I can do what I've done above.
3) I couldn't see any way to assign myself as the committer.
Joe
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Index: contrib/dblink/dblink.c
===================================================================
RCS file: /opt/src/cvs/pgsql/contrib/dblink/dblink.c,v
retrieving revision 1.82
diff -c -r1.82 dblink.c
*** contrib/dblink/dblink.c 11 Jun 2009 14:48:50 -0000 1.82
--- contrib/dblink/dblink.c 4 Aug 2009 01:05:49 -0000
***************
*** 1635,1640 ****
--- 1635,1681 ----
PG_RETURN_DATUM(current_query(fcinfo));
}
+ /*
+ * Retrieve async notifications for a connection.
+ *
+ * Returns an array of notifications, or NULL if none recieved.
+ * Can optionally take a named connection as parameter, but uses the unnamed connection per default.
+ *
+ */
+ PG_FUNCTION_INFO_V1(dblink_get_notify);
+ Datum
+ dblink_get_notify(PG_FUNCTION_ARGS)
+ {
+ PGconn *conn = NULL;
+ remoteConn *rconn = NULL;
+ ArrayBuildState *astate = NULL;
+ PGnotify *notify;
+
+ DBLINK_INIT;
+ if (PG_NARGS() == 1)
+ DBLINK_GET_NAMED_CONN;
+ else
+ conn = pconn->conn;
+
+ PQconsumeInput(conn);
+
+ while ((notify = PQnotifies(conn)) != NULL)
+ {
+ /* stash away current value */
+ astate = accumArrayResult(astate,
+ PointerGetDatum(cstring_to_text(notify->relname)),
+ false, TEXTOID, CurrentMemoryContext);
+ PQfreemem(notify);
+ PQconsumeInput(conn);
+ }
+
+ if (astate)
+ PG_RETURN_ARRAYTYPE_P(makeArrayResult(astate,
+ CurrentMemoryContext));
+ else
+ PG_RETURN_NULL();
+ }
+
/*************************************************************
* internal functions
*/
Index: contrib/dblink/dblink.h
===================================================================
RCS file: /opt/src/cvs/pgsql/contrib/dblink/dblink.h,v
retrieving revision 1.22
diff -c -r1.22 dblink.h
*** contrib/dblink/dblink.h 9 Jun 2009 17:41:02 -0000 1.22
--- contrib/dblink/dblink.h 4 Aug 2009 00:56:56 -0000
***************
*** 57,61 ****
--- 57,62 ----
extern Datum dblink_build_sql_delete(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_update(PG_FUNCTION_ARGS);
extern Datum dblink_current_query(PG_FUNCTION_ARGS);
+ extern Datum dblink_get_notify(PG_FUNCTION_ARGS);
#endif /* DBLINK_H */
Index: contrib/dblink/dblink.sql.in
===================================================================
RCS file: /opt/src/cvs/pgsql/contrib/dblink/dblink.sql.in,v
retrieving revision 1.18
diff -c -r1.18 dblink.sql.in
*** contrib/dblink/dblink.sql.in 9 Jun 2009 17:41:02 -0000 1.18
--- contrib/dblink/dblink.sql.in 4 Aug 2009 00:58:52 -0000
***************
*** 202,204 ****
--- 202,214 ----
RETURNS text
AS 'MODULE_PATHNAME', 'dblink_error_message'
LANGUAGE C STRICT;
+
+ CREATE OR REPLACE FUNCTION dblink_get_notify()
+ RETURNS text[]
+ AS 'MODULE_PATHNAME', 'dblink_get_notify'
+ LANGUAGE C STRICT;
+
+ CREATE OR REPLACE FUNCTION dblink_get_notify(conname text)
+ RETURNS text[]
+ AS 'MODULE_PATHNAME', 'dblink_get_notify'
+ LANGUAGE C STRICT;
Index: contrib/dblink/uninstall_dblink.sql
===================================================================
RCS file: /opt/src/cvs/pgsql/contrib/dblink/uninstall_dblink.sql,v
retrieving revision 1.7
diff -c -r1.7 uninstall_dblink.sql
*** contrib/dblink/uninstall_dblink.sql 5 Apr 2008 02:26:14 -0000 1.7
--- contrib/dblink/uninstall_dblink.sql 4 Aug 2009 00:56:56 -0000
***************
*** 76,78 ****
--- 76,82 ----
DROP FUNCTION dblink_is_busy(text);
DROP FUNCTION dblink_send_query(text, text);
+
+ DROP FUNCTION dblink_get_notify();
+
+ DROP FUNCTION dblink_get_notify(text);
Index: contrib/dblink/expected/dblink.out
===================================================================
RCS file: /opt/src/cvs/pgsql/contrib/dblink/expected/dblink.out,v
retrieving revision 1.25
diff -c -r1.25 dblink.out
*** contrib/dblink/expected/dblink.out 6 Jun 2009 21:27:56 -0000 1.25
--- contrib/dblink/expected/dblink.out 4 Aug 2009 01:20:09 -0000
***************
*** 827,829 ****
--- 827,864 ----
DROP USER MAPPING FOR public SERVER fdtest;
DROP SERVER fdtest;
DROP FOREIGN DATA WRAPPER postgresql;
+ -- test asynchronous notifications
+ SELECT dblink_connect('dbname=contrib_regression');
+ dblink_connect
+ ----------------
+ OK
+ (1 row)
+
+ --should return listen
+ SELECT dblink_exec('LISTEN regression');
+ dblink_exec
+ -------------
+ LISTEN
+ (1 row)
+
+ NOTIFY regression;
+ --should return {regression}
+ SELECT dblink_get_notify();
+ dblink_get_notify
+ -------------------
+ {regression}
+ (1 row)
+
+ --should return null
+ SELECT dblink_get_notify();
+ dblink_get_notify
+ -------------------
+
+ (1 row)
+
+ SELECT dblink_disconnect();
+ dblink_disconnect
+ -------------------
+ OK
+ (1 row)
+
Index: contrib/dblink/sql/dblink.sql
===================================================================
RCS file: /opt/src/cvs/pgsql/contrib/dblink/sql/dblink.sql,v
retrieving revision 1.21
diff -c -r1.21 dblink.sql
*** contrib/dblink/sql/dblink.sql 6 Jun 2009 21:27:56 -0000 1.21
--- contrib/dblink/sql/dblink.sql 4 Aug 2009 01:19:48 -0000
***************
*** 389,391 ****
--- 389,407 ----
DROP USER MAPPING FOR public SERVER fdtest;
DROP SERVER fdtest;
DROP FOREIGN DATA WRAPPER postgresql;
+
+ -- test asynchronous notifications
+ SELECT dblink_connect('dbname=contrib_regression');
+
+ --should return listen
+ SELECT dblink_exec('LISTEN regression');
+
+ NOTIFY regression;
+
+ --should return {regression}
+ SELECT dblink_get_notify();
+
+ --should return null
+ SELECT dblink_get_notify();
+
+ SELECT dblink_disconnect();
Index: doc/src/sgml/dblink.sgml
===================================================================
RCS file: /opt/src/cvs/pgsql/doc/src/sgml/dblink.sgml,v
retrieving revision 1.8
diff -c -r1.8 dblink.sgml
*** doc/src/sgml/dblink.sgml 18 Jun 2009 14:34:36 -0000 1.8
--- doc/src/sgml/dblink.sgml 4 Aug 2009 00:52:09 -0000
***************
*** 1260,1265 ****
--- 1260,1339 ----
</refsect1>
</refentry>
+ <refentry id="CONTRIB-DBLINK-GET-NOTIFY">
+ <refnamediv>
+ <refname>dblink_get_notify</refname>
+ <refpurpose>retrieve async notifications on a connection</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <synopsis>
+ dblink_get_notify() returns text[]
+ dblink_get_notify(text connname) returns text[]
+ </synopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>
+ <function>dblink_get_notify</> retrieves notifications on either
+ the unnamed connection, or on a named connection if specified.
+ To receive notifications via dblink, <function>LISTEN</> must
+ first be issued, using <function>dblink_exec</>.
+ For details see <xref linkend="sql-listen"> and <xref linkend="sql-notify">.
+ </para>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Arguments</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><parameter>conname</parameter></term>
+ <listitem>
+ <para>
+ The name of a named connection to get notifications on.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+ <para>Returns a text array of notification names, or NULL if none.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Example</title>
+
+ <programlisting>
+ test=# SELECT dblink_exec('LISTEN virtual');
+ dblink_exec
+ -------------
+ LISTEN
+ (1 row)
+
+ test=# SELECT dblink_get_notify();
+ dblink_get_notify
+ -------------------
+
+ (1 row)
+
+ test=# NOTIFY virtual;
+ NOTIFY
+
+ test=# SELECT dblink_get_notify();
+ dblink_get_notify
+ -------------------
+ {virtual}
+ (1 row)
+ </programlisting>
+ </refsect1>
+ </refentry>
+
<refentry id="CONTRIB-DBLINK-GET-RESULT">
<refmeta>
<refentrytitle>dblink_get_result</refentrytitle>
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