database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-12-21 05:21:08 +03:00
Code Activity

Use Enum for top level logical replication message types.

Browse Source 
Logical replication protocol uses a single byte character to identify a
message type in logical replication protocol. The code uses string
literals for the same. Use Enum so that

1. All the string literals used can be found at a single place. This
makes it easy to add more types without the risk of conflicts.

2. It's easy to locate the code handling a given message type.

3. When used with switch statements, it is easy to identify the missing
cases using -Wswitch.

Author: Ashutosh Bapat
Reviewed-by: Kyotaro Horiguchi, Andres Freund, Peter Smith and Amit Kapila
Discussion: https://postgr.es/m/CAExHW5uPzQ7L0oAd_ENyvaiYMOPgkrAoJpE+ZY5-obdcVT6NPg@mail.gmail.com
This commit is contained in:
Amit Kapila
2020-11-02 08:18:18 +05:30
parent a929e17e5a
commit 644f0d7cc9
3 changed files with 83 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/backend/replication/logical/proto.c
View File

@@ -44,7 +44,7 @@ static const char *logicalrep_read_namespace(StringInfo in);
void
logicalrep_write_begin(StringInfo out, ReorderBufferTXN *txn)
{
pq_sendbyte(out, 'B'); /* BEGIN */
pq_sendbyte(out, LOGICAL_REP_MSG_BEGIN);
/* fixed fields */
pq_sendint64(out, txn->final_lsn);
@@ -76,7 +76,7 @@ logicalrep_write_commit(StringInfo out, ReorderBufferTXN *txn,
{
uint8 flags = 0;
pq_sendbyte(out, 'C'); /* sending COMMIT */
pq_sendbyte(out, LOGICAL_REP_MSG_COMMIT);
/* send the flags field (unused for now) */
pq_sendbyte(out, flags);
@@ -112,7 +112,7 @@ void
logicalrep_write_origin(StringInfo out, const char *origin,
XLogRecPtr origin_lsn)
{
pq_sendbyte(out, 'O'); /* ORIGIN */
pq_sendbyte(out, LOGICAL_REP_MSG_ORIGIN);
/* fixed fields */
pq_sendint64(out, origin_lsn);
@@ -141,7 +141,7 @@ void
logicalrep_write_insert(StringInfo out, TransactionId xid, Relation rel,
HeapTuple newtuple, bool binary)
{
pq_sendbyte(out, 'I'); /* action INSERT */
pq_sendbyte(out, LOGICAL_REP_MSG_INSERT);
/* transaction ID (if not valid, we're not streaming) */
if (TransactionIdIsValid(xid))
@@ -185,7 +185,7 @@ void
logicalrep_write_update(StringInfo out, TransactionId xid, Relation rel,
HeapTuple oldtuple, HeapTuple newtuple, bool binary)
{
pq_sendbyte(out, 'U'); /* action UPDATE */
pq_sendbyte(out, LOGICAL_REP_MSG_UPDATE);
Assert(rel->rd_rel->relreplident == REPLICA_IDENTITY_DEFAULT ||
rel->rd_rel->relreplident == REPLICA_IDENTITY_FULL ||
@@ -263,7 +263,7 @@ logicalrep_write_delete(StringInfo out, TransactionId xid, Relation rel,
rel->rd_rel->relreplident == REPLICA_IDENTITY_FULL ||
rel->rd_rel->relreplident == REPLICA_IDENTITY_INDEX);
pq_sendbyte(out, 'D'); /* action DELETE */
pq_sendbyte(out, LOGICAL_REP_MSG_DELETE);
/* transaction ID (if not valid, we're not streaming) */
if (TransactionIdIsValid(xid))
@@ -317,7 +317,7 @@ logicalrep_write_truncate(StringInfo out,
int i;
uint8 flags = 0;
pq_sendbyte(out, 'T'); /* action TRUNCATE */
pq_sendbyte(out, LOGICAL_REP_MSG_TRUNCATE);
/* transaction ID (if not valid, we're not streaming) */
if (TransactionIdIsValid(xid))
@@ -369,7 +369,7 @@ logicalrep_write_rel(StringInfo out, TransactionId xid, Relation rel)
{
char *relname;
pq_sendbyte(out, 'R'); /* sending RELATION */
pq_sendbyte(out, LOGICAL_REP_MSG_RELATION);
/* transaction ID (if not valid, we're not streaming) */
if (TransactionIdIsValid(xid))
@@ -425,7 +425,7 @@ logicalrep_write_typ(StringInfo out, TransactionId xid, Oid typoid)
HeapTuple tup;
Form_pg_type typtup;
pq_sendbyte(out, 'Y'); /* sending TYPE */
pq_sendbyte(out, LOGICAL_REP_MSG_TYPE);
/* transaction ID (if not valid, we're not streaming) */
if (TransactionIdIsValid(xid))
@@ -755,7 +755,7 @@ void
logicalrep_write_stream_start(StringInfo out,
TransactionId xid, bool first_segment)
{
pq_sendbyte(out, 'S'); /* action STREAM START */
pq_sendbyte(out, LOGICAL_REP_MSG_STREAM_START);
Assert(TransactionIdIsValid(xid));
@@ -788,7 +788,7 @@ logicalrep_read_stream_start(StringInfo in, bool *first_segment)
void
logicalrep_write_stream_stop(StringInfo out)
{
pq_sendbyte(out, 'E'); /* action STREAM END */
pq_sendbyte(out, LOGICAL_REP_MSG_STREAM_END);
}
/*
@@ -800,7 +800,7 @@ logicalrep_write_stream_commit(StringInfo out, ReorderBufferTXN *txn,
{
uint8 flags = 0;
pq_sendbyte(out, 'c'); /* action STREAM COMMIT */
pq_sendbyte(out, LOGICAL_REP_MSG_STREAM_COMMIT);
Assert(TransactionIdIsValid(txn->xid));
@@ -849,7 +849,7 @@ void
logicalrep_write_stream_abort(StringInfo out, TransactionId xid,
TransactionId subxid)
{
pq_sendbyte(out, 'A'); /* action STREAM ABORT */
pq_sendbyte(out, LOGICAL_REP_MSG_STREAM_ABORT);
Assert(TransactionIdIsValid(xid) && TransactionIdIsValid(subxid));