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/* Copyright (c) 2007-2019, Mark Wong */
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "display.h"
#include "pg.h"
#include "pg_top.h"
#define QUERY_PROCESSES \
"WITH lock_activity AS\n" \
"(\n" \
" SELECT pid, count(*) AS lock_count\n" \
" FROM pg_locks\n" \
" WHERE relation IS NOT NULL\n" \
" GROUP BY pid\n" \
")\n" \
"SELECT a.pid, query, state, usename,\n" \
" extract(EPOCH FROM age(clock_timestamp(),\n" \
" xact_start))::BIGINT,\n" \
" extract(EPOCH FROM age(clock_timestamp(),\n" \
" query_start))::BIGINT,\n" \
" coalesce(lock_count, 0) AS lock_count\n" \
"FROM pg_stat_activity a LEFT OUTER JOIN lock_activity b\n" \
" ON a.pid = b.pid;"
#define QUERY_PROCESSES_9_1 \
"SELECT procpid, current_query\n" \
"FROM pg_stat_activity;"
#define CURRENT_QUERY \
"SELECT query\n" \
"FROM pg_stat_activity\n" \
"WHERE pid = %d;"
#define CURRENT_QUERY_9_1 \
"SELECT current_query\n" \
"FROM pg_stat_activity\n" \
"WHERE procpid = %d;"
#define REPLICATION \
"SELECT pid, usename, application_name, client_addr, state,\n" \
" pg_current_wal_insert_lsn() AS primary,\n" \
" sent_lsn, write_lsn, flush_lsn,\n" \
" replay_lsn, \n" \
" pg_wal_lsn_diff(pg_current_wal_insert_lsn(),\n" \
" sent_lsn) as sent_lag,\n" \
" pg_wal_lsn_diff(pg_current_wal_insert_lsn(),\n" \
" write_lsn) as write_lag,\n" \
" pg_wal_lsn_diff(pg_current_wal_insert_lsn(),\n" \
" flush_lsn) as flush_lag,\n" \
" pg_wal_lsn_diff(pg_current_wal_insert_lsn(),\n" \
" replay_lsn) as replay_lag\n" \
" FROM pg_stat_replication;"
#define REPLICATION_9_6 \
"SELECT pid, usename, application_name, client_addr, state,\n" \
" pg_current_xlog_insert_location() AS primary,\n" \
" sent_location, write_location, flush_location,\n" \
" replay_location, \n" \
" pg_xlog_location_diff(pg_current_xlog_insert_location(),\n" \
" sent_location) as sent_lag,\n" \
" pg_xlog_location_diff(pg_current_xlog_insert_location(),\n" \
" write_location) as write_lag,\n" \
" pg_xlog_location_diff(pg_current_xlog_insert_location(),\n" \
" flush_location) as flush_lag,\n" \
" pg_xlog_location_diff(pg_current_xlog_insert_location(),\n" \
" replay_location) as replay_lag\n" \
" FROM pg_stat_replication;"
#define GET_LOCKS \
"SELECT datname, nspname, r.relname, i.relname, mode, granted\n" \
"FROM pg_stat_activity, pg_locks\n" \
"LEFT OUTER JOIN pg_class r \n" \
" ON relation = r.oid\n"\
" AND r.relkind = 'r'\n" \
"LEFT OUTER JOIN pg_class i \n" \
" ON relation = i.oid\n"\
" AND i.relkind = 'i'\n" \
"LEFT OUTER JOIN pg_namespace nsp\n" \
" ON coalesce(r.relnamespace, i.relnamespace) = nsp.oid\n" \
"WHERE pg_stat_activity.pid = %d\n" \
" AND pg_stat_activity.pid = pg_locks.pid\n" \
" AND relation IS NOT NULL;"
#define GET_LOCKS_9_1 \
"SELECT datname, nspname, r.relname, i.relname, mode, granted\n" \
"FROM pg_stat_activity, pg_locks\n" \
"LEFT OUTER JOIN pg_class r \n" \
" ON relation = r.oid\n"\
" AND r.relkind = 'r'\n" \
"LEFT OUTER JOIN pg_class i \n" \
" ON relation = i.oid\n"\
" AND i.relkind = 'i'\n" \
"LEFT OUTER JOIN pg_namespace nsp\n" \
" ON coalesce(r.relnamespace, i.relnamespace) = nsp.oid\n" \
"WHERE procpid = %d\n" \
" AND procpid = pid\n" \
" AND relation IS NOT NULL;"
int pg_version(PGconn *);
void
connect_to_db(struct pg_conninfo_ctx *conninfo)
{
int i;
const char *keywords[6] = {"host", "port", "user", "password", "dbname",
NULL};
if (conninfo->persistent && PQsocket(conninfo->connection) >= 0)
return;
conninfo->connection = PQconnectdbParams(keywords, conninfo->values, 1);
if (PQstatus(conninfo->connection) != CONNECTION_OK)
{
new_message(MT_standout | MT_delayed, " %s",
PQerrorMessage(conninfo->connection));
PQfinish(conninfo->connection);
conninfo->connection = NULL;
return;
}
if (conninfo->persistent)
for (i = 0; i < 5; i++)
if (conninfo->values[i] != NULL)
free((void *) conninfo->values[i]);
PQexec(conninfo->connection,
"SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL " \
"READ UNCOMMITTED;");
}
void
disconnect_from_db(struct pg_conninfo_ctx *conninfo)
{
if (conninfo->persistent)
return;
PQfinish(conninfo->connection);
}
PGresult *
pg_locks(PGconn *pgconn, int procpid)
{
char *sql;
PGresult *pgresult;
if (pg_version(pgconn) >= 902)
{
sql = (char *) malloc(strlen(GET_LOCKS) + 7);
sprintf(sql, GET_LOCKS, procpid);
}
else
{
sql = (char *) malloc(strlen(GET_LOCKS) + 7);
sprintf(sql, GET_LOCKS_9_1, procpid);
}
pgresult = PQexec(pgconn, sql);
free(sql);
return pgresult;
}
PGresult *
pg_processes(PGconn *pgconn)
{
PGresult *pgresult;
PQexec(pgconn, "BEGIN;");
PQexec(pgconn, "SET statement_timeout = '2s';");
if (pg_version(pgconn) >= 902)
{
pgresult = PQexec(pgconn, QUERY_PROCESSES);
}
else
{
pgresult = PQexec(pgconn, QUERY_PROCESSES_9_1);
}
PQexec(pgconn, "ROLLBACK;;");
return pgresult;
}
PGresult *
pg_replication(PGconn *pgconn)
{
PGresult *pgresult;
PQexec(pgconn, "BEGIN;");
PQexec(pgconn, "SET statement_timeout = '2s';");
if (pg_version(pgconn) >= 1000) {
pgresult = PQexec(pgconn, REPLICATION);
} else {
pgresult = PQexec(pgconn, REPLICATION_9_6);
}
PQexec(pgconn, "ROLLBACK;");
return pgresult;
}
PGresult *
pg_query(PGconn *pgconn, int procpid)
{
char *sql;
PGresult *pgresult;
if (pg_version(pgconn) >= 902)
{
sql = (char *) malloc(strlen(CURRENT_QUERY) + 7);
sprintf(sql, CURRENT_QUERY, procpid);
}
else
{
sql = (char *) malloc(strlen(CURRENT_QUERY_9_1) + 7);
sprintf(sql, CURRENT_QUERY_9_1, procpid);
}
pgresult = PQexec(pgconn, sql);
free(sql);
return pgresult;
}
int
pg_version(PGconn *pgconn)
{
return PQserverVersion(pgconn) / 100;
}
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