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SQLancer finds logic bugs in Database Management Systems through automatic testing
package sqlancer.mysql.gen;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import sqlancer.MainOptions;
import sqlancer.Randomly;
import sqlancer.common.query.SQLQueryAdapter;
import sqlancer.mysql.MySQLGlobalState;
public class MySQLSetGenerator {
private final Randomly r;
private final StringBuilder sb = new StringBuilder();
// currently, global options are only generated when a single thread is executed
private boolean isSingleThreaded;
public MySQLSetGenerator(Randomly r, MainOptions options) {
this.r = r;
this.isSingleThreaded = options.getNumberConcurrentThreads() == 1;
}
public static SQLQueryAdapter set(MySQLGlobalState globalState) {
return new MySQLSetGenerator(globalState.getRandomly(), globalState.getOptions()).get();
}
private enum Scope {
GLOBAL, SESSION
}
private enum Action {
AUTOCOMMIT("autocommit", (r) -> 1, Scope.GLOBAL, Scope.SESSION), //
BIG_TABLES("big_tables", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION), //
COMPLETION_TYPE("completion_type", (r) -> Randomly.fromOptions("'NO_CHAIN'", "'CHAIN'", "'RELEASE'", 0, 1, 2),
Scope.GLOBAL), //
BULK_INSERT_CACHE_SIZE("bulk_insert_buffer_size", (r) -> r.getLong(0, Long.MAX_VALUE), Scope.GLOBAL, //
Scope.SESSION), //
CONCURRENT_INSERT("concurrent_insert", (r) -> Randomly.fromOptions("NEVER", "AUTO", "ALWAYS", 0, 1, 2), //
Scope.GLOBAL), //
CTE_MAX_RECURSION_DEPTH("cte_max_recursion_depth", //
(r) -> r.getLong(0, 4294967295L), Scope.GLOBAL), //
DELAY_KEY_WRITE("delay_key_write", (r) -> Randomly.fromOptions("ON", "OFF", "ALL"), Scope.GLOBAL), //
EQ_RANGE_INDEX_DIVE_LIMIT("eq_range_index_dive_limit", (r) -> r.getLong(0, 4294967295L), Scope.GLOBAL), //
FLUSH("flush", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL), //
FOREIGN_KEY_CHECKS("foreign_key_checks", (r) -> Randomly.fromOptions(1, 0), Scope.GLOBAL, Scope.SESSION), //
HISTOGRAM_GENERATION_MAX_MEM_SIZE("histogram_generation_max_mem_size",
(r) -> r.getLong(1000000, Long.MAX_VALUE), Scope.GLOBAL, Scope.SESSION), //
HOST_CACHE_SIZE("host_cache_size", (r) -> r.getLong(0, 65536), Scope.GLOBAL), //
INTERNAL_TMP_MEM_STORAGE_ENGINE("internal_tmp_mem_storage_engine",
(r) -> Randomly.fromOptions("TempTable", "MEMORY"), Scope.GLOBAL, Scope.SESSION), //
JOIN_BUFFER_SIZE("join_buffer_size", (r) -> r.getLong(128, Long.MAX_VALUE), Scope.GLOBAL, Scope.SESSION),
/* disabled as a workaround for https://bugs.mysql.com/bug.php?id=95987 */
// KEY_BUFFER_SIZE("key_buffer_size", (r) -> r.getLong(8, Long.MAX_VALUE), Scope.GLOBAL),
// KEY_CACHE_AGE_THRESHOLD("key_cache_age_threshold", (r) -> r.getLong(100, Long.MAX_VALUE), Scope.GLOBAL),
// KEY_CACHE_BLOCK_SIZE("key_cache_block_size", (r) -> r.getLong(512, 16384), Scope.GLOBAL),
// KEY_CACHE_DIVISION_LIMIT("key_cache_division_limit", (r) -> r.getLong(1, 100), Scope.GLOBAL),
MAX_HEAP_TABLE_SIZE("max_heap_table_size", (r) -> r.getLong(16384, Long.MAX_VALUE), Scope.GLOBAL,
Scope.SESSION), //
MAX_LENGTH_FOR_SORT_DATA("max_length_for_sort_data", (r) -> r.getLong(4, 8388608), Scope.GLOBAL, Scope.SESSION), //
MAX_POINTS_IN_GEOMETRY("max_points_in_geometry", (r) -> r.getLong(4, 1048576), Scope.GLOBAL, Scope.SESSION), //
MAX_SEEKS_FOR_KEY("max_seeks_for_key", (r) -> r.getLong(1, Long.MAX_VALUE), Scope.GLOBAL, Scope.SESSION),
MAX_SORT_LENGTH("max_sort_length", (r) -> r.getLong(4, 8388608), Scope.GLOBAL, Scope.SESSION), //
MAX_SP_RECURSION_DEPTH("max_sp_recursion_depth", (r) -> r.getLong(0, 255), Scope.GLOBAL, Scope.SESSION), //
MYISAM_DATA_POINTER_SIZE("myisam_data_pointer_size", (r) -> r.getLong(2, 7), Scope.GLOBAL), //
MYISAM_MAX_SORT_FILE_SIZE("myisam_max_sort_file_size", (r) -> r.getLong(0, 9223372036854775807L), Scope.GLOBAL), //
MYISAM_REPAIR_THREADS("myisam_repair_threads", (r) -> r.getLong(1, Long.MAX_VALUE), Scope.GLOBAL,
Scope.SESSION), //
MYISAM_SORT_BUFFER_SIZE("myisam_sort_buffer_size", (r) -> r.getLong(4096, Long.MAX_VALUE), Scope.GLOBAL,
Scope.SESSION), //
MYISAM_STATS_METHOD("myisam_stats_method",
(r) -> Randomly.fromOptions("nulls_equal", "nulls_unequal", "nulls_ignored"), Scope.GLOBAL,
Scope.SESSION), //
MYISAM_USE_MMAP("myisam_use_mmap", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL),
OLD_ALTER_TABLE("old_alter_table", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION), //
OPTIMIZER_PRUNE_LEVEL("optimizer_prune_level", (r) -> Randomly.fromOptions(0, 1), Scope.GLOBAL, Scope.SESSION), //
OPTIMIZER_SEARCH_DEPTH("optimizer_search_depth", (r) -> r.getLong(0, 62), Scope.GLOBAL, Scope.SESSION), //
OPTIMIZER_SWITCH("optimizer_switch", (r) -> getOptimizerSwitchConfiguration(r), Scope.GLOBAL, Scope.SESSION), //
PARSER_MAX_MEM_SIZE("parser_max_mem_size", (r) -> r.getLong(10000000, Long.MAX_VALUE), Scope.GLOBAL,
Scope.SESSION), //
PRELOAD_BUFFER_SIZE("preload_buffer_size", (r) -> r.getLong(1024, 1073741824), Scope.GLOBAL, Scope.SESSION), //
QUERY_ALLOC_BLOCK_SIZE("query_alloc_block_size", (r) -> r.getLong(1024, 4294967295L), Scope.GLOBAL,
Scope.SESSION), //
QUERY_PREALLOC_SIZE("query_prealloc_size", (r) -> r.getLong(8192, Long.MAX_VALUE), Scope.GLOBAL, Scope.SESSION), //
RANGE_ALLOC_BLOCK_SIZE("range_alloc_block_size", (r) -> r.getLong(4096, Long.MAX_VALUE), Scope.GLOBAL,
Scope.SESSION), //
RANGE_OPTIMIZER_MAX_MEM_SIZE("range_optimizer_max_mem_size", (r) -> r.getLong(0, Long.MAX_VALUE), Scope.GLOBAL,
Scope.SESSION),
/*
* Removed Scope.GLOBAL as a workaround for https://bugs.mysql.com/bug.php?id=95985
*/
RBR_EXEC_MODE("rbr_exec_mode", (r) -> Randomly.fromOptions("IDEMPOTENT", "STRICT"), //
Scope.SESSION), //
READ_BUFFER_SIZE("read_buffer_size", (r) -> r.getLong(8200, 2147479552), Scope.GLOBAL, Scope.SESSION), //
READ_RND_BUFFER_SIZE("read_rnd_buffer_size", (r) -> r.getLong(1, 2147483647), Scope.GLOBAL, Scope.SESSION), //
SCHEMA_DEFINITION_CACHE("schema_definition_cache", (r) -> r.getLong(256, 524288), Scope.GLOBAL), //
SHOW_CREATE_TABLE_VERBOSITY("show_create_table_verbosity", (r) -> Randomly.fromOptions("OFF", "ON"),
Scope.GLOBAL, Scope.SESSION), //
SHOW_OLD_TEMPORALS("show_old_temporals", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION),
/*
* sort_buffer_size is commented out as a workaround for https://bugs.mysql.com/bug.php?id=95969
*/
// SORT_BUFFER_SIZE("sort_buffer_size", (r) -> r.getLong(32768,
// Long.MAX_VALUE)),
SQL_AUTO_IS_NULL("sql_auto_is_null", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION), //
SQL_BUFFER_RESULT("sql_buffer_result", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION), //
SQL_LOG_OFF("sql_log_off", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION), //
SQL_QUOTE_SHOW_CREATE("sql_quote_show_create", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL,
Scope.SESSION),
// SQL_REQUIRE_PRIMARY_KEY("sql_require_primary_key", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL),
TMP_TABLE_SIZE("tmp_table_size", (r) -> r.getLong(1024, Long.MAX_VALUE), Scope.GLOBAL, Scope.SESSION), //
UNIQUE_CHECKS("unique_checks", (r) -> Randomly.fromOptions("OFF", "ON"), Scope.GLOBAL, Scope.SESSION);
// TODO: https://dev.mysql.com/doc/refman/8.0/en/switchable-optimizations.html
private String name;
private Function prod;
private final Scope[] scopes;
Action(String name, Function prod, Scope... scopes) {
if (scopes.length == 0) {
throw new AssertionError(name);
}
this.name = name;
this.prod = prod;
this.scopes = scopes.clone();
}
/*
* @see https://dev.mysql.com/doc/refman/8.0/en/switchable-optimizations.html
*/
private static String getOptimizerSwitchConfiguration(Randomly r) {
StringBuilder sb = new StringBuilder();
sb.append("'");
String[] options = { "batched_key_access", "block_nested_loop", "condition_fanout_filter", "derived_merge",
"engine_condition_pushdown", "index_condition_pushdown", "use_index_extensions", "index_merge",
"index_merge_intersection", "index_merge_sort_union", "index_merge_union", "use_invisible_indexes",
"mrr", "mrr_cost_based", "skip_scan", "semijoin", "duplicateweedout", "firstmatch", "loosescan",
"materialization", "subquery_materialization_cost_based" };
List optionSubset = Randomly.nonEmptySubset(options);
sb.append(optionSubset.stream().map(s -> s + "=" + Randomly.fromOptions("on", "off"))
.collect(Collectors.joining(",")));
sb.append("'");
return sb.toString();
}
public boolean canBeUsedInScope(Scope session) {
for (Scope scope : scopes) {
if (scope == session) {
return true;
}
}
return false;
}
public Scope[] getScopes() {
return scopes.clone();
}
}
private SQLQueryAdapter get() {
sb.append("SET ");
Action a;
if (isSingleThreaded) {
a = Randomly.fromOptions(Action.values());
Scope[] scopes = a.getScopes();
Scope randomScope = Randomly.fromOptions(scopes);
switch (randomScope) {
case GLOBAL:
sb.append("GLOBAL");
break;
case SESSION:
sb.append("SESSION");
break;
default:
throw new AssertionError(randomScope);
}
} else {
do {
a = Randomly.fromOptions(Action.values());
} while (!a.canBeUsedInScope(Scope.SESSION));
sb.append("SESSION");
}
sb.append(" ");
sb.append(a.name);
sb.append(" = ");
sb.append(a.prod.apply(r));
return new SQLQueryAdapter(sb.toString());
}
}