[svn-commits] markm: trunk r300882 - /trunk/res/res_config_pgsql.c
SVN commits to the Digium repositories
svn-commits at lists.digium.com
Fri Jan 7 01:47:43 UTC 2011
Author: markm
Date: Fri Jan 7 01:47:36 2011
New Revision: 300882
URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=300882
Log:
Added support for postgres database retry query on disconnection to res_config_pgsql
If your postgres connection died suddenly in between res_config_pgsql
queries, the next query will fail because the query is executed on a
disconnected/disconnecting handle. The query is abandoned and is
returned from in error.
Now we will reconnect and try again if a query was run on a
disconnected connection.
(closes issue #18071)
Modified:
trunk/res/res_config_pgsql.c
Modified: trunk/res/res_config_pgsql.c
URL: http://svnview.digium.com/svn/asterisk/trunk/res/res_config_pgsql.c?view=diff&rev=300882&r1=300881&r2=300882
==============================================================================
--- trunk/res/res_config_pgsql.c (original)
+++ trunk/res/res_config_pgsql.c Fri Jan 7 01:47:36 2011
@@ -125,13 +125,134 @@
ast_free(table);
}
-static struct tables *find_table(const char *orig_tablename)
+/*! \brief Helper function for pgsql_exec. For running querys, use pgsql_exec()
+ *
+ * Connect if not currently connected. Run the given query.
+ *
+ * \param database database name we are connected to (used for error logging)
+ * \param tablename table name we are connected to (used for error logging)
+ * \param sql sql query string to execute
+ * \param result pointer for where to store the result handle
+ *
+ * \return -1 on fatal query error
+ * \return -2 on query failure that resulted in disconnection
+ * \return 0 on success
+ *
+ * \example see pgsql_exec for full example
+ */
+static int _pgsql_exec(const char *database, const char *tablename, const char *sql, PGresult **result)
+{
+ ExecStatusType result_status;
+
+ if (!pgsqlConn) {
+ ast_debug(1, "PostgreSQL connection not defined, connecting\n");
+
+ if (pgsql_reconnect(database) != 1) {
+ ast_log(LOG_NOTICE, "reconnect failed\n");
+ *result = NULL;
+ return -1;
+ }
+
+ ast_debug(1, "PostgreSQL connection successful\n");
+ }
+
+ *result = PQexec(pgsqlConn, sql);
+ result_status = PQresultStatus(*result);
+ if (result_status != PGRES_COMMAND_OK
+ && result_status != PGRES_TUPLES_OK
+ && result_status != PGRES_NONFATAL_ERROR) {
+
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: Failed to query '%s@%s'.\n", tablename, database);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: Query Failed: %s\n", sql);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
+ PQresultErrorMessage(*result),
+ PQresStatus(result_status));
+
+ /* we may have tried to run a command on a disconnected/disconnecting handle */
+ /* are we no longer connected to the database... if not try again */
+ if (PQstatus(pgsqlConn) != CONNECTION_OK) {
+ PQfinish(pgsqlConn);
+ pgsqlConn = NULL;
+ return -2;
+ }
+
+ /* connection still okay, which means the query is just plain bad */
+ return -1;
+ }
+
+ ast_debug(1, "PostgreSQL query successful: %s\n", sql);
+ return 0;
+}
+
+/*! \brief Do a postgres query, with reconnection support
+ *
+ * Connect if not currently connected. Run the given query
+ * and if we're disconnected afterwards, reconnect and query again.
+ *
+ * \param database database name we are connected to (used for error logging)
+ * \param tablename table name we are connected to (used for error logging)
+ * \param sql sql query string to execute
+ * \param result pointer for where to store the result handle
+ *
+ * \return -1 on query failure
+ * \return 0 on success
+ *
+ * \example
+ * int i, rows;
+ * PGresult *result;
+ * char *field_name, *field_type, *field_len, *field_notnull, *field_default;
+ *
+ * pgsql_exec("db", "table", "SELECT 1", &result)
+ *
+ * rows = PQntuples(result);
+ * for (i = 0; i < rows; i++) {
+ * field_name = PQgetvalue(result, i, 0);
+ * field_type = PQgetvalue(result, i, 1);
+ * field_len = PQgetvalue(result, i, 2);
+ * field_notnull = PQgetvalue(result, i, 3);
+ * field_default = PQgetvalue(result, i, 4);
+ * }
+ *
+ */
+static int pgsql_exec(const char *database, const char *tablename, const char *sql, PGresult **result)
+{
+ int attempts = 0;
+ int res;
+
+ /* Try the query, note failure if any */
+ /* On first failure, reconnect and try again (_pgsql_exec handles reconnect) */
+ /* On second failure, treat as fatal query error */
+
+ while (attempts++ < 2) {
+ ast_debug(1, "PostgreSQL query attempt %d\n", attempts);
+ res = _pgsql_exec(database, tablename, sql, result);
+
+ if (res == 0) {
+ if (attempts > 1) {
+ ast_log(LOG_NOTICE, "PostgreSQL RealTime: Query finally succeeded: %s\n", sql);
+ }
+
+ return 0;
+ }
+
+ if (res == -1) {
+ return -1; /* Still connected to db, but could not process query (fatal error) */
+ }
+
+ /* res == -2 (query on a disconnected handle) */
+ ast_debug(1, "PostgreSQL query attempt %d failed, trying again\n", attempts);
+ }
+
+ return -1;
+}
+
+static struct tables *find_table(const char *database, const char *orig_tablename)
{
struct columns *column;
struct tables *table;
struct ast_str *sql = ast_str_thread_get(&findtable_buf, 330);
- char *pgerror;
- PGresult *result;
+ PGresult *result;
+ int exec_result;
char *fname, *ftype, *flen, *fnotnull, *fdef;
int i, rows;
@@ -209,11 +330,10 @@
ast_str_set(&sql, 0, "SELECT a.attname, t.typname, a.attlen, a.attnotnull, d.adsrc, a.atttypmod FROM pg_class c, pg_type t, pg_attribute a LEFT OUTER JOIN pg_attrdef d ON a.atthasdef AND d.adrelid = a.attrelid AND d.adnum = a.attnum WHERE c.oid = a.attrelid AND a.atttypid = t.oid AND (a.attnum > 0) AND c.relname = '%s' ORDER BY c.relname, attnum", orig_tablename);
}
- result = PQexec(pgsqlConn, ast_str_buffer(sql));
+ exec_result = pgsql_exec(database, orig_tablename, ast_str_buffer(sql), &result);
ast_debug(1, "Query of table structure complete. Now retrieving results.\n");
- if (PQresultStatus(result) != PGRES_TUPLES_OK) {
- pgerror = PQresultErrorMessage(result);
- ast_log(LOG_ERROR, "Failed to query database columns: %s\n", pgerror);
+ if (exec_result != 0) {
+ ast_log(LOG_ERROR, "Failed to query database columns for table %s\n", orig_tablename);
PQclear(result);
AST_LIST_UNLOCK(&psql_tables);
return NULL;
@@ -327,7 +447,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
va_end(ap);
return NULL;
}
@@ -342,7 +462,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
va_end(ap);
return NULL;
}
@@ -353,32 +473,11 @@
/* We now have our complete statement; Lets connect to the server and execute it. */
ast_mutex_lock(&pgsql_lock);
- if (!pgsql_reconnect(database)) {
+
+ if (pgsql_exec(database, tablename, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
return NULL;
- }
-
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query '%s@%s'. Check debug for more info.\n", tablename, database);
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
- ast_mutex_unlock(&pgsql_lock);
- return NULL;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query '%s@%s'. Check debug for more info.\n", tablename, database);
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return NULL;
- }
- }
+ }
ast_debug(1, "PostgreSQL RealTime: Result=%p Query: %s\n", result, ast_str_buffer(sql));
@@ -477,7 +576,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
va_end(ap);
return NULL;
}
@@ -492,7 +591,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
va_end(ap);
return NULL;
}
@@ -508,32 +607,11 @@
/* We now have our complete statement; Lets connect to the server and execute it. */
ast_mutex_lock(&pgsql_lock);
- if (!pgsql_reconnect(database)) {
+
+ if (pgsql_exec(database, table, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
- return NULL;
- }
-
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query %s@%s. Check debug for more info.\n", table, database);
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
- ast_mutex_unlock(&pgsql_lock);
- return NULL;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query %s@%s. Check debug for more info.\n", table, database);
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return NULL;
- }
- }
+ return NULL;
+ }
ast_debug(1, "PostgreSQL RealTime: Result=%p Query: %s\n", result, ast_str_buffer(sql));
@@ -599,7 +677,7 @@
return -1;
}
- if (!(table = find_table(tablename))) {
+ if (!(table = find_table(database, tablename))) {
ast_log(LOG_ERROR, "Table '%s' does not exist!!\n", tablename);
return -1;
}
@@ -636,7 +714,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
va_end(ap);
release_table(table);
return -1;
@@ -653,7 +731,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
va_end(ap);
release_table(table);
return -1;
@@ -666,7 +744,7 @@
ESCAPE_STRING(escapebuf, lookup);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", lookup);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", lookup);
va_end(ap);
return -1;
}
@@ -677,31 +755,10 @@
/* We now have our complete statement; Lets connect to the server and execute it. */
ast_mutex_lock(&pgsql_lock);
- if (!pgsql_reconnect(database)) {
+
+ if (pgsql_exec(database, tablename, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
return -1;
- }
-
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
- ast_mutex_unlock(&pgsql_lock);
- return -1;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return -1;
- }
}
numrows = atoi(PQcmdTuples(result));
@@ -741,7 +798,7 @@
return -1;
}
- if (!(table = find_table(tablename))) {
+ if (!(table = find_table(database, tablename))) {
ast_log(LOG_ERROR, "Table '%s' does not exist!!\n", tablename);
return -1;
}
@@ -759,7 +816,7 @@
newval = va_arg(ap, const char *);
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
release_table(table);
ast_free(sql);
return -1;
@@ -792,7 +849,7 @@
ESCAPE_STRING(escapebuf, newval);
if (pgresult) {
- ast_log(LOG_ERROR, "Postgres detected invalid input: '%s'\n", newval);
+ ast_log(LOG_ERROR, "PostgreSQL RealTime: detected invalid input: '%s'\n", newval);
release_table(table);
ast_free(sql);
return -1;
@@ -807,33 +864,10 @@
ast_debug(1, "PostgreSQL RealTime: Update SQL: %s\n", ast_str_buffer(sql));
/* We now have our complete statement; connect to the server and execute it. */
- ast_mutex_lock(&pgsql_lock);
- if (!pgsql_reconnect(database)) {
+ if (pgsql_exec(database, tablename, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
- return -1;
- }
-
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
- ast_mutex_unlock(&pgsql_lock);
- return -1;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return -1;
- }
- }
+ return -1;
+ }
numrows = atoi(PQcmdTuples(result));
ast_mutex_unlock(&pgsql_lock);
@@ -906,27 +940,10 @@
ast_debug(1, "PostgreSQL RealTime: Insert SQL: %s\n", ast_str_buffer(sql1));
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql1)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql1));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
+ if (pgsql_exec(database, table, ast_str_buffer(sql1), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
- return -1;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql1));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return -1;
- }
- }
+ return -1;
+ }
insertid = PQoidValue(result);
ast_mutex_unlock(&pgsql_lock);
@@ -997,27 +1014,10 @@
ast_debug(1, "PostgreSQL RealTime: Delete SQL: %s\n", ast_str_buffer(sql));
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
+ if (pgsql_exec(database, table, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
- return -1;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return -1;
- }
- }
+ return -1;
+ }
numrows = atoi(PQcmdTuples(result));
ast_mutex_unlock(&pgsql_lock);
@@ -1057,39 +1057,18 @@
}
ast_str_set(&sql, 0, "SELECT category, var_name, var_val, cat_metric FROM %s "
- "WHERE filename='%s' and commented=0"
+ "WHERE filename='%s' and commented=0 "
"ORDER BY cat_metric DESC, var_metric ASC, category, var_name ", table, file);
ast_debug(1, "PostgreSQL RealTime: Static SQL: %s\n", ast_str_buffer(sql));
+ ast_mutex_lock(&pgsql_lock);
+
/* We now have our complete statement; Lets connect to the server and execute it. */
- ast_mutex_lock(&pgsql_lock);
- if (!pgsql_reconnect(database)) {
+ if (pgsql_exec(database, table, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
- return NULL;
- }
-
- if (!(result = PQexec(pgsqlConn, ast_str_buffer(sql)))) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query '%s@%s'. Check debug for more info.\n", table, database);
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s\n", PQerrorMessage(pgsqlConn));
- ast_mutex_unlock(&pgsql_lock);
- return NULL;
- } else {
- ExecStatusType result_status = PQresultStatus(result);
- if (result_status != PGRES_COMMAND_OK
- && result_status != PGRES_TUPLES_OK
- && result_status != PGRES_NONFATAL_ERROR) {
- ast_log(LOG_WARNING,
- "PostgreSQL RealTime: Failed to query database. Check debug for more info.\n");
- ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
- ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
- PQresultErrorMessage(result), PQresStatus(result_status));
- ast_mutex_unlock(&pgsql_lock);
- return NULL;
- }
- }
+ return NULL;
+ }
if ((num_rows = PQntuples(result)) > 0) {
int rowIndex = 0;
@@ -1135,7 +1114,7 @@
static int require_pgsql(const char *database, const char *tablename, va_list ap)
{
struct columns *column;
- struct tables *table = find_table(tablename);
+ struct tables *table = find_table(database, tablename);
char *elm;
int type, size, res = 0;
@@ -1236,15 +1215,13 @@
ast_debug(1, "About to lock pgsql_lock (running alter on table '%s' to add column '%s')\n", tablename, elm);
ast_mutex_lock(&pgsql_lock);
- if (!pgsql_reconnect(database)) {
+ ast_debug(1, "About to run ALTER query on table '%s' to add column '%s'\n", tablename, elm);
+
+ if (pgsql_exec(database, tablename, ast_str_buffer(sql), &result) != 0) {
ast_mutex_unlock(&pgsql_lock);
- ast_log(LOG_ERROR, "Unable to add column: %s\n", ast_str_buffer(sql));
- ast_free(sql);
- continue;
- }
-
- ast_debug(1, "About to run ALTER query on table '%s' to add column '%s'\n", tablename, elm);
- result = PQexec(pgsqlConn, ast_str_buffer(sql));
+ return -1;
+ }
+
ast_debug(1, "Finished running ALTER query on table '%s'\n", tablename);
if (PQresultStatus(result) != PGRES_COMMAND_OK) {
ast_log(LOG_ERROR, "Unable to add column: %s\n", ast_str_buffer(sql));
@@ -1537,7 +1514,7 @@
AST_LIST_UNLOCK(&psql_tables);
} else if (a->argc == 5) {
/* List of columns */
- if ((cur = find_table(a->argv[4]))) {
+ if ((cur = find_table(cur->name, a->argv[4]))) {
struct columns *col;
ast_cli(a->fd, "Columns for Table Cache '%s':\n", a->argv[4]);
ast_cli(a->fd, "%-20.20s %-20.20s %-3.3s %-8.8s\n", "Name", "Type", "Len", "Nullable");
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