/**
 * @file load_balancing.cpp Checks how Maxscale balances load
 *
 * - also used for 'load_balancing_pers1' and 'load_balancing_pers10' tests (with 'persistpoolmax=1' and 'persistpoolmax=10' for all servers)
 *
 * - start two groups of threads: each group consists of 25 threads, each thread creates connections to RWSplit,
 * threads from first group try to execute as many SELECTs as possible, from second group - one query per second
 * - after 100 seconds all threads are stopped
 * - check number of connections to every slave: test PASSED if COM_SELECT difference between slaves is not greater then 3 times and no
 * more then 10% of quesries went to Master
 */



#include "testconnections.h"
#include "sql_t1.h"
#include "get_com_select_insert.h"

#include "big_load.h"

int main(int argc, char *argv[])
{

    TestConnections * Test = new TestConnections(argc, argv);
    Test->set_timeout(20);
    long int q;
    int threads_num = 25;

    long int selects[256];
    long int inserts[256];
    long int new_selects[256];
    long int new_inserts[256];
    long int i1, i2;

    if (Test->smoke)
    {
        threads_num = 15;
    }
    Test->tprintf("Increasing connection and error limits on backend nodes.\n");
    Test->repl->connect();
    for (int i = 0; i < Test->repl->N; i++)
    {
        execute_query(Test->repl->nodes[i], (char *) "set global max_connections = 300;");
        execute_query(Test->repl->nodes[i], (char *) "set global max_connect_errors = 100000;");
    }
    Test->repl->close_connections();

    Test->tprintf("Creating query load with %d threads...\n", threads_num);
    Test->set_timeout(1200);
    load(&new_inserts[0], &new_selects[0], &selects[0], &inserts[0], threads_num, Test, &i1, &i2, 1, false, true);

    long int avr = (i1 + i2 ) / (Test->repl->N);
    Test->tprintf("average number of quries per node %ld\n", avr);
    long int min_q = avr / 3;
    long int max_q = avr * 3;
    Test->tprintf("Acceplable value for every node from %ld until %ld\n", min_q, max_q);

    for (int i = 1; i < Test->repl->N; i++)
    {
        q = new_selects[i] - selects[i];
        if ((q > max_q) || (q < min_q))
        {
            Test->add_result(1, "number of queries for node %d is %ld\n", i + 1, q);
        }
    }

    if ((new_selects[0] - selects[0]) > avr / 3 )
    {
        Test->add_result(1,
                         "number of queries for master greater then 30%% of averange number of queries per node\n");
    }

    Test->tprintf("Restoring nodes\n");
    Test->repl->connect();
    for (int i = 0; i < Test->repl->N; i++)
    {
        execute_query(Test->repl->nodes[i], (char *) "flush hosts;");
        execute_query(Test->repl->nodes[i], (char *) "set global max_connections = 151;");
    }
    Test->repl->close_connections();


    Test->check_maxscale_alive(0);

    Test->repl->start_replication();

    int rval = Test->global_result;
    delete Test;
    return rval;
}