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[#22] Get LSN #23

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[#22] Get LSN #23

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1 change: 1 addition & 0 deletions doc/manual/user-02-functions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -27,3 +27,4 @@ ALTER USER repl WITH NOSUPERUSER;
| `pgmoneta_ext_get_oids()` | Default | None | Return all OIDs on the current server.|
| `pgmoneta_ext_get_file()`| SUPERUSER | path/to/file | Return the bytes of the specified file that is passed in.|
| `pgmoneta_ext_get_files()` | SUPERUSER | path/to/dir | Return all file paths in the specified directory passed in.|
| `pgmoneta_ext_get_lsn()` | Default | None | Return the location of the last write of WAL.|
6 changes: 5 additions & 1 deletion sql/pgmoneta_ext--0.1.0.sql
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Expand Up @@ -28,6 +28,10 @@ CREATE FUNCTION pgmoneta_ext_get_file(file_path TEXT) RETURNS TEXT
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;

CREATE OR REPLACE FUNCTION pgmoneta_ext_get_files(file_path TEXT) RETURNS text[]
CREATE FUNCTION pgmoneta_ext_get_files(file_path TEXT) RETURNS text[]
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;

CREATE FUNCTION pgmoneta_ext_get_lsn() RETURNS text
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;
14 changes: 14 additions & 0 deletions src/pgmoneta_ext/lib.c
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Expand Up @@ -76,6 +76,7 @@ PG_FUNCTION_INFO_V1(pgmoneta_ext_get_oid);
PG_FUNCTION_INFO_V1(pgmoneta_ext_get_oids);
PG_FUNCTION_INFO_V1(pgmoneta_ext_get_file);
PG_FUNCTION_INFO_V1(pgmoneta_ext_get_files);
PG_FUNCTION_INFO_V1(pgmoneta_ext_get_lsn);

Datum
pgmoneta_ext_version(PG_FUNCTION_ARGS)
Expand Down Expand Up @@ -449,3 +450,16 @@ list_files(const char* name, ArrayBuildState* astate)
}
closedir(dir);
}

Datum
pgmoneta_ext_get_lsn(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn;
char lsn_str[64];

lsn = GetXLogWriteRecPtr();

snprintf(lsn_str, sizeof(lsn_str), "%X/%X", (uint32)(lsn >> 32), (uint32)lsn);

PG_RETURN_TEXT_P(cstring_to_text(lsn_str));
}
11 changes: 11 additions & 0 deletions test/lib/pgmoneta_ext_test.c
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Expand Up @@ -38,6 +38,7 @@
#define PGMONETA_EXT_GET_FILES_REGEX "^\\{((\\/[^,]+,?\\s*)*)\\}$"
#define PGMONETA_EXT_GET_OID_REGEX "^[1-9][0-9]*$"
#define PGMONETA_EXT_GET_OIDS_REGEX "^\\([1-9][0-9]*,[a-zA-Z0-9]+\\)$"
#define PGMONETA_EXT_GET_LSN_REGEX "^[A-Za-z0-9]+/[A-Za-z0-9]+$"

#define PGMONETA_EXT_GET_FILE_PATH "/pgsql/logfile"
#define PGMONETA_EXT_GET_FILES_PATH "/conf"
Expand Down Expand Up @@ -120,6 +121,15 @@ START_TEST(test_pgmoneta_ext_get_oids)
}
END_TEST

START_TEST(test_pgmoneta_ext_get_lsn)
{
char output[BUFFER_SIZE];
int result = execute_command("psql -h localhost -p 5432 -U repl -d postgres -t -c 'SELECT pgmoneta_ext_get_lsn();'", output, BUFFER_SIZE);
ck_assert_int_eq(result, 0);
ck_assert_msg(regex_match(output, PGMONETA_EXT_GET_LSN_REGEX) == 0, "Expected WAL switch result not found in output: %s", output);
}
END_TEST

Suite*
pgmoneta_ext_suite(void)
{
Expand All @@ -137,6 +147,7 @@ pgmoneta_ext_suite(void)
tcase_add_test(tc_core, test_pgmoneta_ext_get_files);
tcase_add_test(tc_core, test_pgmoneta_ext_get_oid);
tcase_add_test(tc_core, test_pgmoneta_ext_get_oids);
tcase_add_test(tc_core, test_pgmoneta_ext_get_lsn);
suite_add_tcase(s, tc_core);

return s;
Expand Down