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Never output a leading comma before non-transactional messages by gclinch · Pull Request #101 · eulerto/wal2json · GitHub

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Never output a leading comma before non-transactional messages #101

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Never output a leading comma before non-transactional messages #101

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36 changes: 35 additions & 1 deletion expected/message.out
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,20 @@ SELECT 'msg10' FROM pg_logical_emit_message(true, 'wal2json', 'this is message #
msg10
(1 row)

COMMIT;
SELECT 'msg11' FROM pg_logical_emit_message(false, 'wal2json', 'this message is outside of a transaction');
?column?
----------
msg11
(1 row)

BEGIN;
SELECT 'msg12' FROM pg_logical_emit_message(true, 'wal2json', 'this message will be printed last');
?column?
----------
msg12
(1 row)

COMMIT;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'pretty-print', '1');
data
Expand Down Expand Up @@ -160,7 +174,27 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'pre
} +
] +
}
(8 rows)
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "this message is outside of a transaction" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": true, +
"prefix": "wal2json", +
"content": "this message will be printed last" +
} +
] +
}
(10 rows)

SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
?column?
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6 changes: 6 additions & 0 deletions sql/message.sql
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Expand Up @@ -23,6 +23,12 @@ SELECT 'msg9' FROM pg_logical_emit_message(false, 'wal2json', 'this message will
SELECT 'msg10' FROM pg_logical_emit_message(true, 'wal2json', 'this is message #2');
COMMIT;

SELECT 'msg11' FROM pg_logical_emit_message(false, 'wal2json', 'this message is outside of a transaction');

BEGIN;
SELECT 'msg12' FROM pg_logical_emit_message(true, 'wal2json', 'this message will be printed last');
COMMIT;

SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'pretty-print', '1');

SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
2 changes: 1 addition & 1 deletion wal2json.c
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Expand Up @@ -1040,7 +1040,7 @@ pg_decode_message(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,

appendStringInfo(ctx->out, "%s%s", data->ht, data->ht);

if (data->nr_changes > 1)
if (transactional && data->nr_changes > 1)
appendStringInfoChar(ctx->out, ',');

appendStringInfo(ctx->out, "{%s%s%s%s\"kind\":%s\"message\",%s", data->nl, data->ht, data->ht, data->ht, data->sp, data->nl);
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