DBZ-8403 Fix PostgreSQL 17 compilation

When compiling against PG17 on Debian testing with gcc 14, building
fails because of incompatible-pointer-type error. This commit updates
the macros added in e1f8714 to handle the pointer types.

README.md

@@ -10,15 +10,17 @@
 A PostgreSQL logical decoder output plugin to deliver data as [Protocol Buffers](https://developers.google.com/protocol-buffers), adapted for Debezium
 
 ## Thanks to
-- The original [Decoderbufs Project](https://github.com/xstevens/decoderbufs) on which this is based 
+
+- The original [Decoderbufs Project](https://github.com/xstevens/decoderbufs) on which this is based
 - [The PostgreSQL Team](https://postgresql.org) for adding [logical decoding](http://www.postgresql.org/docs/9.4/static/logicaldecoding.html) support
 
 ## Dependencies
+
 This code depends on the following libraries and requires them for compilation:
 
-* [PostgreSQL](http://www.postgresql.org) 9.6+
-* [Protobuf-c](https://github.com/protobuf-c/protobuf-c) 1.2+ - used for data serialization
-* [PostGIS](http://www.postgis.net/) 2.1+ - used for Postgres geometric types support
+- [PostgreSQL](http://www.postgresql.org) 9.6+
+- [Protobuf-c](https://github.com/protobuf-c/protobuf-c) 1.2+ - used for data serialization
+- [PostGIS](http://www.postgis.net/) 2.1+ - used for Postgres geometric types support
 
 ## Building
 
@@ -26,43 +28,52 @@ This code depends on the following libraries and requires them for compilation:
 (for pg_config), PostgreSQL server development packages, protobuf-c for the Protocol Buffer support and some PostGIS development packages.
 
 ### Installing Dependencies
+
 #### Debian
 
-    # Core build utilities 
-    apt-get update && apt-get install -f -y software-properties-common build-essential pkg-config git postgresql-server-dev-9.6 
-    
-    # PostGIS dependency
-    apt-get install -f -y libproj-dev liblwgeom-dev
+```bash
+# Core build utilities 
+apt-get update && apt-get install -f -y software-properties-common build-essential pkg-config git postgresql-server-dev-9.6 
 
-    # Protobuf-c dependency (requires a non-stable Debian repo)
-    add-apt-repository "deb http://ftp.debian.org/debian testing main contrib" && apt-get update
-    apt-get install -y libprotobuf-c-dev=1.2.1-1+b1
+# PostGIS dependency
+apt-get install -f -y libproj-dev liblwgeom-dev
+
+# Protobuf-c dependency (requires a non-stable Debian repo)
+add-apt-repository "deb http://ftp.debian.org/debian testing main contrib" && apt-get update
+apt-get install -y libprotobuf-c-dev=1.2.1-1+b1
+```
 
 When updating the ProtoBuf definition, also install the ProtoBuf C compiler:
 
-    apt-get install -y protobuf-c-compiler=1.2.*
+```bash
+apt-get install -y protobuf-c-compiler=1.2.*
+```
 
 The above are taken from the Debezium [container images](https://github.com/debezium/docker-images).
 
 #### Other Linux distributions
 
-You just need to make sure the above software packages (_or some flavour thereof_) are installed for your distro. 
+You just need to make sure the above software packages (_or some flavour thereof_) are installed for your distro.
 Note that the last step from the above sequence is only required for Debian to be able to install `libprotobuf-c-dev:1.2.1`
 
 ### Getting the source code
 
 If you have all of the above prerequisites installed, clone this git repo to build from source:
 
-    git clone https://github.com/debezium/postgres-decoderbufs.git
-    cd postgres-decoderbufs
+```bash
+git clone https://github.com/debezium/postgres-decoderbufs.git
+cd postgres-decoderbufs
+```
 
 ### Optional: Re-generating ProtoBuf code
 
 This is only needed after changes to the ProtoBuf definition (_proto/pg_logicaldec.proto):
 
-    cd proto
-    protoc-c --c_out=../src/proto pg_logicaldec.proto
-    cd ..
+```bash
+cd proto
+protoc-c --c_out=../src/proto pg_logicaldec.proto
+cd ..
+```
 
 Commit the generated files to git then.
 
@@ -71,49 +82,58 @@ Commit the generated files to git then.
 If you have multiple Postgres versions installed, you can select which version to install decoderbufs into by altering your `$PATH` to point to the right version.
 Then `make` and `make install` for each version.  Here is an example:
 
-    # Install for Postgres 9.6 if I have multiple local versions
-    export PATH=/usr/lib/postgresql/9.6/bin:$PATH
-    make
-    make install
+```bash
+# Install for Postgres 9.6 if I have multiple local versions
+export PATH=/usr/lib/postgresql/9.6/bin:$PATH
+make
+make install
+```
 
 Once the extension has been installed you just need to enable it and logical replication in postgresql.conf:
 
-    # MODULES
-    shared_preload_libraries = 'decoderbufs'
-    
-    # REPLICATION
-    wal_level = logical             # minimal, archive, hot_standby, or logical (change requires restart)
-    max_wal_senders = 8             # max number of walsender processes (change requires restart)
-    wal_keep_segments = 4           # in logfile segments, 16MB each; 0 disables
-    #wal_sender_timeout = 60s       # in milliseconds; 0 disables
-    max_replication_slots = 4       # max number of replication slots (change requires restart)
+```bash
+# MODULES
+shared_preload_libraries = 'decoderbufs'
+
+# REPLICATION
+wal_level = logical             # minimal, archive, hot_standby, or logical (change requires restart)
+max_wal_senders = 8             # max number of walsender processes (change requires restart)
+wal_keep_segments = 4           # in logfile segments, 16MB each; 0 disables
+#wal_sender_timeout = 60s       # in milliseconds; 0 disables
+max_replication_slots = 4       # max number of replication slots (change requires restart)
+```
 
 In addition, permissions will have to be added for the user that connects to the DB to be able to replicate. This can be modified in _pg\_hba.conf_ like so:
 
-    local   replication     <youruser>                          trust
-    host    replication     <youruser>  127.0.0.1/32            trust
-    host    replication     <youruser>  ::1/128                 trust
-    
+```make
+local   replication     <youruser>                          trust
+host    replication     <youruser>  127.0.0.1/32            trust
+host    replication     <youruser>  ::1/128                 trust
+```
+
 And restart PostgreSQL.
 
 ## Usage
-    -- can use SQL for demo purposes
-    select * from pg_create_logical_replication_slot('decoderbufs_demo', 'decoderbufs');
-    
-    -- DO SOME TABLE MODIFICATIONS (see below about UPDATE/DELETE)
-    
-    -- peek at WAL changes using decoderbufs debug mode for SQL console
-    select data from pg_logical_slot_peek_changes('decoderbufs_demo', NULL, NULL, 'debug-mode', '1');
-    -- get WAL changes using decoderbufs to update the WAL position
-    select data from pg_logical_slot_get_changes('decoderbufs_demo', NULL, NULL, 'debug-mode', '1');
-    
-    -- check the WAL position of logical replicators
-    select * from pg_replication_slots where slot_type = 'logical';
+
+```sql
+-- can use SQL for demo purposes
+select * from pg_create_logical_replication_slot('decoderbufs_demo', 'decoderbufs');
+
+-- DO SOME TABLE MODIFICATIONS (see below about UPDATE/DELETE)
+
+-- peek at WAL changes using decoderbufs debug mode for SQL console
+select data from pg_logical_slot_peek_changes('decoderbufs_demo', NULL, NULL, 'debug-mode', '1');
+-- get WAL changes using decoderbufs to update the WAL position
+select data from pg_logical_slot_get_changes('decoderbufs_demo', NULL, NULL, 'debug-mode', '1');
+
+-- check the WAL position of logical replicators
+select * from pg_replication_slots where slot_type = 'logical';
+```
 
 If you're performing an UPDATE/DELETE on your table and you don't see results for those operations from logical decoding, make sure you have set [REPLICA IDENTITY](http://www.postgresql.org/docs/9.4/static/sql-altertable.html#SQL-CREATETABLE-REPLICA-IDENTITY) appropriately for your use case.
-    
+
 The binary format will be consumed by the Debezium Postgres Connector.
-          
+
 ## Type Mappings
 
 The following table shows how current PostgreSQL type OIDs are mapped to which decoderbuf fields:
@@ -144,5 +164,5 @@ The following table shows how current PostgreSQL type OIDs are mapped to which d
 
 ## Support
 
-File bug reports and feature requests using [Debezium's JIRA](https://issues.jboss.org/browse/DBZ) and the 
+File bug reports and feature requests using [Debezium's JIRA](https://issues.jboss.org/browse/DBZ) and the
 [postgresql-connector](https://issues.jboss.org/browse/DBZ/component/12323543) component

src/decoderbufs.c

@@ -60,6 +60,12 @@
 #error Expecting timestamps to be represented as integers, not as floating-point.
 #endif
 
+#if PG_VERSION_NUM >= 170000
+#define TUPLE_ACCESS(x) x
+#else
+#define TUPLE_ACCESS(x) &x->tuple
+#endif
+
 PG_MODULE_MAGIC;
 
 /* define a time macro to convert TimestampTz into something more sane,
@@ -622,13 +628,13 @@ static void pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
         rmsg.new_tuple =
             palloc(sizeof(Decoderbufs__DatumMessage*) * rmsg.n_new_tuple);
         tuple_to_tuple_msg(rmsg.new_tuple, relation,
-                           &change->data.tp.newtuple->tuple, tupdesc);
+                           TUPLE_ACCESS(change->data.tp.newtuple), tupdesc);
 
         rmsg.n_new_typeinfo = rmsg.n_new_tuple;
         rmsg.new_typeinfo =
             palloc(sizeof(Decoderbufs__TypeInfo*) * rmsg.n_new_typeinfo);
         add_metadata_to_msg(rmsg.new_typeinfo, relation,
-                           &change->data.tp.newtuple->tuple, tupdesc);
+                           TUPLE_ACCESS(change->data.tp.newtuple), tupdesc);
       }
       break;
     case REORDER_BUFFER_CHANGE_UPDATE:
@@ -643,7 +649,7 @@ static void pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
           rmsg.old_tuple =
               palloc(sizeof(Decoderbufs__DatumMessage*) * rmsg.n_old_tuple);
           tuple_to_tuple_msg(rmsg.old_tuple, relation,
-                             &change->data.tp.oldtuple->tuple, tupdesc);
+                             TUPLE_ACCESS(change->data.tp.oldtuple), tupdesc);
         }
         if (change->data.tp.newtuple != NULL) {
           elog(DEBUG1, "decoding new tuple information");
@@ -653,13 +659,13 @@ static void pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
           rmsg.new_tuple =
               palloc(sizeof(Decoderbufs__DatumMessage*) * rmsg.n_new_tuple);
           tuple_to_tuple_msg(rmsg.new_tuple, relation,
-                             &change->data.tp.newtuple->tuple, tupdesc);
+                             TUPLE_ACCESS(change->data.tp.newtuple), tupdesc);
 
           rmsg.n_new_typeinfo = rmsg.n_new_tuple;
           rmsg.new_typeinfo =
               palloc(sizeof(Decoderbufs__TypeInfo*) * rmsg.n_new_typeinfo);
           add_metadata_to_msg(rmsg.new_typeinfo, relation,
-                             &change->data.tp.newtuple->tuple, tupdesc);
+                             TUPLE_ACCESS(change->data.tp.newtuple), tupdesc);
         }
       }
       break;
@@ -675,7 +681,7 @@ static void pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
         rmsg.old_tuple =
             palloc(sizeof(Decoderbufs__DatumMessage*) *  rmsg.n_old_tuple);
         tuple_to_tuple_msg(rmsg.old_tuple, relation,
-                           &change->data.tp.oldtuple->tuple, tupdesc);
+                           TUPLE_ACCESS(change->data.tp.oldtuple), tupdesc);
       } else {
         elog(DEBUG1, "no information to decode from DELETE because either no PK is present or REPLICA IDENTITY NOTHING or invalid ");
       }