/** * @file test_ffto_pgsql_errors-t.cpp * @brief FFTO E2E TAP test — PostgreSQL error handling. * * Validates that PgSQLFFTO gracefully handles ErrorResponse ('E') * messages from the PostgreSQL backend. When an error occurs, FFTO * should report partial stats for the failed query and cleanly * transition back to IDLE state for subsequent queries. * * @par Test scenarios * 1. Syntax error followed by successful query — recovery * 2. Constraint violation (duplicate key) — recovery * 3. Error within transaction — ROLLBACK tracked * * @pre ProxySQL running with a PostgreSQL backend. * * @see PgSQLFFTO.cpp — process_server_message() handles 'E' (ErrorResponse) */ #include #include #include #include #include #include #include "libpq-fe.h" #include "mysql.h" #include "tap.h" #include "command_line.h" #include "utils.h" /** * @brief Total number of planned TAP assertions. * * Breakdown: * - Setup: 1 (connect) * - Scenario 1 (syntax): 3 (recovery query digest) * - Scenario 2 (constraint): 3 (successful INSERT after failure) * - Scenario 3 (txn error): 3 (ROLLBACK digest) * Total = 10 */ static constexpr int kPlannedTests = 10; #define FAIL_AND_SKIP_REMAINING(cleanup_label, fmt, ...) \ do { \ diag(fmt, ##__VA_ARGS__); \ int remaining = kPlannedTests - tests_last(); \ if (remaining > 0) { \ skip(remaining, "Skipping remaining assertions after setup failure"); \ } \ goto cleanup_label; \ } while (0) #define EXEC_PG_QUERY(conn, q) \ { \ PGresult* res_exec = PQexec(conn, q); \ if (!res_exec) { \ ok(0, "PG Query failed: %s", q); \ FAIL_AND_SKIP_REMAINING(cleanup, "No result: %s", PQerrorMessage(conn)); \ } \ if (PQresultStatus(res_exec) != PGRES_COMMAND_OK && \ PQresultStatus(res_exec) != PGRES_TUPLES_OK) { \ ok(0, "PG Query failed: %s", q); \ PQclear(res_exec); \ FAIL_AND_SKIP_REMAINING(cleanup, "Failed: %s", PQerrorMessage(conn)); \ } \ PQclear(res_exec); \ } /** @brief Verify PgSQL digest with polling. Emits 3 assertions. */ void verify_pg_digest(MYSQL* admin, const char* template_text, int expected_count, uint64_t expected_rows_affected = 0, uint64_t expected_rows_sent = 0) { char query[1024]; snprintf(query, sizeof(query), "SELECT count_star, sum_rows_affected, sum_rows_sent, digest_text " "FROM stats_pgsql_query_digest WHERE digest_text LIKE '%%%s%%'", template_text); MYSQL_RES* res = NULL; MYSQL_ROW row = NULL; for (int attempt = 0; attempt < 20; attempt++) { int rc = run_q(admin, query); if (rc != 0) { usleep(100000); continue; } res = mysql_store_result(admin); if (!res) { usleep(100000); continue; } row = mysql_fetch_row(res); if (row) break; mysql_free_result(res); res = NULL; usleep(100000); } if (row) { int count = atoi(row[0]); uint64_t ra = strtoull(row[1], NULL, 10); uint64_t rs = strtoull(row[2], NULL, 10); ok(count >= expected_count, "PG digest '%s': count=%d (>= %d)", row[3], count, expected_count); ok(ra == expected_rows_affected, "PG rows_affected '%s': %llu (== %llu)", row[3], (unsigned long long)ra, (unsigned long long)expected_rows_affected); ok(rs == expected_rows_sent, "PG rows_sent '%s': %llu (== %llu)", row[3], (unsigned long long)rs, (unsigned long long)expected_rows_sent); } else { ok(0, "PG digest NOT found: %s", template_text); ok(0, "Skipping rows_affected"); ok(0, "Skipping rows_sent"); diag("Dumping stats_pgsql_query_digest:"); run_q(admin, "SELECT digest_text, count_star FROM stats_pgsql_query_digest"); MYSQL_RES* dr = mysql_store_result(admin); MYSQL_ROW drw; while (dr && (drw = mysql_fetch_row(dr))) diag(" %s count:%s", drw[0], drw[1]); if (dr) mysql_free_result(dr); } if (res) mysql_free_result(res); } static void clear_pg_stats(MYSQL* admin) { mysql_query(admin, "SELECT * FROM stats_pgsql_query_digest_reset"); MYSQL_RES* r = mysql_store_result(admin); if (r) mysql_free_result(r); } int main(int argc, char** argv) { CommandLine cl; if (cl.getEnv()) { diag("Failed to get env vars."); return -1; } diag("=== FFTO PostgreSQL Error Handling Test ==="); plan(kPlannedTests); MYSQL* admin = mysql_init(NULL); PGconn* conn = NULL; if (!mysql_real_connect(admin, cl.host, cl.admin_username, cl.admin_password, NULL, cl.admin_port, NULL, 0)) { diag("Admin connection failed"); return -1; } MYSQL_QUERY(admin, "UPDATE global_variables SET variable_value='true' " "WHERE variable_name='pgsql-ffto_enabled'"); MYSQL_QUERY(admin, "UPDATE global_variables SET variable_value='1048576' " "WHERE variable_name='pgsql-ffto_max_buffer_size'"); MYSQL_QUERY(admin, "LOAD PGSQL VARIABLES TO RUNTIME"); { char eu[2 * strlen(cl.pgsql_root_username) + 1]; char ep[2 * strlen(cl.pgsql_root_password) + 1]; mysql_real_escape_string(admin, eu, cl.pgsql_root_username, strlen(cl.pgsql_root_username)); mysql_real_escape_string(admin, ep, cl.pgsql_root_password, strlen(cl.pgsql_root_password)); char uq[1024]; snprintf(uq, sizeof(uq), "INSERT OR REPLACE INTO pgsql_users (username, password, fast_forward) " "VALUES ('%s', '%s', 1)", eu, ep); MYSQL_QUERY(admin, uq); MYSQL_QUERY(admin, "LOAD PGSQL USERS TO RUNTIME"); } { char sq[1024]; snprintf(sq, sizeof(sq), "INSERT OR REPLACE INTO pgsql_servers (hostgroup_id, hostname, port) " "VALUES (0, '%s', %d)", cl.pgsql_server_host, cl.pgsql_server_port); MYSQL_QUERY(admin, sq); MYSQL_QUERY(admin, "LOAD PGSQL SERVERS TO RUNTIME"); } { char ci[1024]; snprintf(ci, sizeof(ci), "host=%s port=%d user=%s password=%s dbname=postgres sslmode=disable", cl.pgsql_host, cl.pgsql_port, cl.pgsql_root_username, cl.pgsql_root_password); conn = PQconnectdb(ci); } if (PQstatus(conn) != CONNECTION_OK) { diag("PG connection failed: %s", PQerrorMessage(conn)); FAIL_AND_SKIP_REMAINING(cleanup, "PG connection failed"); } ok(conn != NULL, "Connected to PostgreSQL via ProxySQL"); EXEC_PG_QUERY(conn, "DROP TABLE IF EXISTS ffto_pg_err"); EXEC_PG_QUERY(conn, "CREATE TABLE ffto_pg_err (id INT PRIMARY KEY, val TEXT)"); EXEC_PG_QUERY(conn, "INSERT INTO ffto_pg_err VALUES (1, 'existing')"); /* ================================================================ * Scenario 1: Syntax error followed by successful query * ================================================================ */ diag("--- Scenario 1: syntax error recovery ---"); clear_pg_stats(admin); { PGresult* rs = PQexec(conn, "SELEC BAD SYNTAX HERE"); if (rs) { diag("Error status: %s", PQresStatus(PQresultStatus(rs))); PQclear(rs); } } { PGresult* rs = PQexec(conn, "SELECT val FROM ffto_pg_err WHERE id = 1"); if (rs) PQclear(rs); } verify_pg_digest(admin, "SELECT val FROM ffto_pg_err WHERE id", 1, 0, 1); /* ================================================================ * Scenario 2: Constraint violation — duplicate key * ================================================================ */ diag("--- Scenario 2: constraint violation recovery ---"); clear_pg_stats(admin); { PGresult* rs = PQexec(conn, "INSERT INTO ffto_pg_err VALUES (1, 'duplicate')"); if (rs) { diag("Dup key: %s", PQresStatus(PQresultStatus(rs))); PQclear(rs); } } EXEC_PG_QUERY(conn, "INSERT INTO ffto_pg_err VALUES (2, 'new_row')"); verify_pg_digest(admin, "INSERT INTO ffto_pg_err VALUES", 1, 1, 0); /* ================================================================ * Scenario 3: Error within transaction — ROLLBACK tracked * ================================================================ */ diag("--- Scenario 3: error in transaction ---"); clear_pg_stats(admin); EXEC_PG_QUERY(conn, "BEGIN"); { PGresult* rs = PQexec(conn, "INSERT INTO ffto_pg_err VALUES (1, 'dup_txn')"); if (rs) PQclear(rs); } EXEC_PG_QUERY(conn, "ROLLBACK"); verify_pg_digest(admin, "ROLLBACK", 1, 0, 0); cleanup: if (conn) PQfinish(conn); if (admin) mysql_close(admin); return exit_status(); }