/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2012-2015, Magnus Edenhill
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "test.h"

/* Typical include path would be <librdkafka/rdkafka.h>, but this program
 * is built from within the librdkafka source tree and thus differs. */
#include "rdkafka.h" /* for Kafka driver */


/**
 * Consumer: various offset commit constellations, matrix:
 *   enable.auto.commit, enable.auto.offset.store, async
 */

static char *topic;
static const int msgcnt    = 100;
static const int partition = 0;
static uint64_t testid;

static int64_t expected_offset  = 0;
static int64_t committed_offset = -1;


static void offset_commit_cb(rd_kafka_t *rk,
                             rd_kafka_resp_err_t err,
                             rd_kafka_topic_partition_list_t *offsets,
                             void *opaque) {
        rd_kafka_topic_partition_t *rktpar;

        TEST_SAYL(3, "Offset committed: %s:\n", rd_kafka_err2str(err));
        if (err == RD_KAFKA_RESP_ERR__NO_OFFSET)
                return;

        test_print_partition_list(offsets);
        if (err)
                TEST_FAIL("Offset commit failed: %s", rd_kafka_err2str(err));
        if (offsets->cnt == 0)
                TEST_FAIL(
                    "Expected at least one partition in offset_commit_cb");

        /* Find correct partition */
        if (!(rktpar = rd_kafka_topic_partition_list_find(offsets, topic,
                                                          partition)))
                return;

        if (rktpar->err)
                TEST_FAIL("Offset commit failed for partitioń : %s",
                          rd_kafka_err2str(rktpar->err));

        if (rktpar->offset > expected_offset)
                TEST_FAIL("Offset committed %" PRId64
                          " > expected offset %" PRId64,
                          rktpar->offset, expected_offset);

        if (rktpar->offset < committed_offset)
                TEST_FAIL("Old offset %" PRId64
                          " (re)committed: "
                          "should be above committed_offset %" PRId64,
                          rktpar->offset, committed_offset);
        else if (rktpar->offset == committed_offset)
                TEST_SAYL(1, "Current offset re-committed: %" PRId64 "\n",
                          rktpar->offset);
        else
                committed_offset = rktpar->offset;

        if (rktpar->offset < expected_offset) {
                TEST_SAYL(3,
                          "Offset committed %" PRId64
                          " < expected offset %" PRId64 "\n",
                          rktpar->offset, expected_offset);
                return;
        }

        TEST_SAYL(3, "Expected offset committed: %" PRId64 "\n",
                  rktpar->offset);
}


static void do_offset_test(const char *what,
                           int auto_commit,
                           int auto_store,
                           int async,
                           int subscribe) {
        test_timing_t t_all;
        char groupid[64];
        rd_kafka_t *rk;
        rd_kafka_conf_t *conf;
        rd_kafka_topic_conf_t *tconf;
        int cnt             = 0;
        const int extra_cnt = 5;
        rd_kafka_resp_err_t err;
        rd_kafka_topic_partition_list_t *parts;
        rd_kafka_topic_partition_t *rktpar;
        int64_t next_offset = -1;

        SUB_TEST_QUICK("%s", what);

        test_conf_init(&conf, &tconf, subscribe ? 30 : 10);
        test_conf_set(conf, "session.timeout.ms", "6000");
        test_conf_set(conf, "enable.auto.commit",
                      auto_commit ? "true" : "false");
        test_conf_set(conf, "enable.auto.offset.store",
                      auto_store ? "true" : "false");
        test_conf_set(conf, "auto.commit.interval.ms", "500");
        rd_kafka_conf_set_offset_commit_cb(conf, offset_commit_cb);
        test_topic_conf_set(tconf, "auto.offset.reset", "smallest");
        test_str_id_generate(groupid, sizeof(groupid));
        test_conf_set(conf, "group.id", groupid);
        rd_kafka_conf_set_default_topic_conf(conf, tconf);

        TIMING_START(&t_all, "%s", what);

        expected_offset  = 0;
        committed_offset = -1;

        /* MO:
         *  - Create consumer.
         *  - Start consuming from beginning
         *  - Perform store & commits according to settings
         *  - Stop storing&committing when half of the messages are consumed,
         *  - but consume 5 more to check against.
         *  - Query position.
         *  - Destroy consumer.
         *  - Create new consumer with same group.id using stored offsets
         *  - Should consume the expected message.
         */

        /* Create kafka instance */
        rk = test_create_handle(RD_KAFKA_CONSUMER, rd_kafka_conf_dup(conf));

        rd_kafka_poll_set_consumer(rk);

        if (subscribe) {
                test_consumer_subscribe(rk, topic);
        } else {
                parts = rd_kafka_topic_partition_list_new(1);
                rd_kafka_topic_partition_list_add(parts, topic, partition);
                test_consumer_assign("ASSIGN", rk, parts);
                rd_kafka_topic_partition_list_destroy(parts);
        }

        while (cnt - extra_cnt < msgcnt / 2) {
                rd_kafka_message_t *rkm;

                rkm = rd_kafka_consumer_poll(rk, 10 * 1000);
                if (!rkm)
                        continue;

                if (rkm->err == RD_KAFKA_RESP_ERR__TIMED_OUT)
                        TEST_FAIL("%s: Timed out waiting for message %d", what,
                                  cnt);
                else if (rkm->err)
                        TEST_FAIL("%s: Consumer error: %s", what,
                                  rd_kafka_message_errstr(rkm));

                /* Offset of next message. */
                next_offset = rkm->offset + 1;

                if (cnt < msgcnt / 2) {
                        if (!auto_store) {
                                err = rd_kafka_offset_store(
                                    rkm->rkt, rkm->partition, rkm->offset);
                                if (err)
                                        TEST_FAIL(
                                            "%s: offset_store failed: %s\n",
                                            what, rd_kafka_err2str(err));
                        }
                        expected_offset = rkm->offset + 1;
                        if (!auto_commit) {
                                test_timing_t t_commit;
                                TIMING_START(&t_commit, "%s @ %" PRId64,
                                             async ? "commit.async"
                                                   : "commit.sync",
                                             rkm->offset + 1);
                                err = rd_kafka_commit_message(rk, rkm, async);
                                TIMING_STOP(&t_commit);
                                if (err)
                                        TEST_FAIL("%s: commit failed: %s\n",
                                                  what, rd_kafka_err2str(err));
                        }

                } else if (auto_store && auto_commit)
                        expected_offset = rkm->offset + 1;

                rd_kafka_message_destroy(rkm);
                cnt++;
        }

        TEST_SAY("%s: done consuming after %d messages, at offset %" PRId64
                 ", next_offset %" PRId64 "\n",
                 what, cnt, expected_offset, next_offset);

        if ((err = rd_kafka_assignment(rk, &parts)))
                TEST_FAIL("%s: failed to get assignment(): %s\n", what,
                          rd_kafka_err2str(err));

        /* Verify position */
        if ((err = rd_kafka_position(rk, parts)))
                TEST_FAIL("%s: failed to get position(): %s\n", what,
                          rd_kafka_err2str(err));
        if (!(rktpar =
                  rd_kafka_topic_partition_list_find(parts, topic, partition)))
                TEST_FAIL("%s: position(): topic lost\n", what);
        if (rktpar->offset != next_offset)
                TEST_FAIL("%s: Expected position() offset %" PRId64
                          ", got %" PRId64,
                          what, next_offset, rktpar->offset);
        TEST_SAY("%s: Position is at %" PRId64 ", good!\n", what,
                 rktpar->offset);

        /* Pause messages while waiting so we can serve callbacks
         * without having more messages received. */
        if ((err = rd_kafka_pause_partitions(rk, parts)))
                TEST_FAIL("%s: failed to pause partitions: %s\n", what,
                          rd_kafka_err2str(err));
        rd_kafka_topic_partition_list_destroy(parts);

        /* Fire off any enqueued offset_commit_cb */
        test_consumer_poll_no_msgs(what, rk, testid, 0);

        TEST_SAY("%s: committed_offset %" PRId64 ", expected_offset %" PRId64
                 "\n",
                 what, committed_offset, expected_offset);

        if (!auto_commit && !async) {
                /* Sync commits should be up to date at this point. */
                if (committed_offset != expected_offset)
                        TEST_FAIL("%s: Sync commit: committed offset %" PRId64
                                  " should be same as expected offset "
                                  "%" PRId64,
                                  what, committed_offset, expected_offset);
        } else {

                /* Wait for offset commits to catch up */
                while (committed_offset < expected_offset) {
                        TEST_SAYL(2,
                                  "%s: Wait for committed offset %" PRId64
                                  " to reach expected offset %" PRId64 "\n",
                                  what, committed_offset, expected_offset);
                        test_consumer_poll_no_msgs(what, rk, testid, 1000);
                }
        }

        TEST_SAY(
            "%s: phase 1 complete, %d messages consumed, "
            "next expected offset is %" PRId64 "\n",
            what, cnt, expected_offset);

        /* Issue #827: cause committed() to return prematurely by specifying
         *             low timeout. The bug (use after free) will only
         *             be catched by valgrind.
         *
         * rusage: this triggers a bunch of protocol requests which
         *         increase .ucpu, .scpu, .ctxsw.
         */
        do {
                parts = rd_kafka_topic_partition_list_new(1);
                rd_kafka_topic_partition_list_add(parts, topic, partition);
                err = rd_kafka_committed(rk, parts, 1);
                rd_kafka_topic_partition_list_destroy(parts);
                if (err)
                        TEST_SAY("Issue #827: committed() returned %s\n",
                                 rd_kafka_err2str(err));
        } while (err != RD_KAFKA_RESP_ERR__TIMED_OUT);

        /* Query position */
        parts = rd_kafka_topic_partition_list_new(1);
        rd_kafka_topic_partition_list_add(parts, topic, partition);

        err = rd_kafka_committed(rk, parts, tmout_multip(5 * 1000));
        if (err)
                TEST_FAIL("%s: committed() failed: %s", what,
                          rd_kafka_err2str(err));
        if (!(rktpar =
                  rd_kafka_topic_partition_list_find(parts, topic, partition)))
                TEST_FAIL("%s: committed(): topic lost\n", what);
        if (rktpar->offset != expected_offset)
                TEST_FAIL("%s: Expected committed() offset %" PRId64
                          ", got %" PRId64,
                          what, expected_offset, rktpar->offset);
        TEST_SAY("%s: Committed offset is at %" PRId64 ", good!\n", what,
                 rktpar->offset);

        rd_kafka_topic_partition_list_destroy(parts);
        test_consumer_close(rk);
        rd_kafka_destroy(rk);



        /* Fire up a new consumer and continue from where we left off. */
        TEST_SAY("%s: phase 2: starting new consumer to resume consumption\n",
                 what);
        rk = test_create_handle(RD_KAFKA_CONSUMER, conf);
        rd_kafka_poll_set_consumer(rk);

        if (subscribe) {
                test_consumer_subscribe(rk, topic);
        } else {
                parts = rd_kafka_topic_partition_list_new(1);
                rd_kafka_topic_partition_list_add(parts, topic, partition);
                test_consumer_assign("ASSIGN", rk, parts);
                rd_kafka_topic_partition_list_destroy(parts);
        }

        while (cnt < msgcnt) {
                rd_kafka_message_t *rkm;

                rkm = rd_kafka_consumer_poll(rk, 10 * 1000);
                if (!rkm)
                        continue;

                if (rkm->err == RD_KAFKA_RESP_ERR__TIMED_OUT)
                        TEST_FAIL("%s: Timed out waiting for message %d", what,
                                  cnt);
                else if (rkm->err)
                        TEST_FAIL("%s: Consumer error: %s", what,
                                  rd_kafka_message_errstr(rkm));

                if (rkm->offset != expected_offset)
                        TEST_FAIL("%s: Received message offset %" PRId64
                                  ", expected %" PRId64 " at msgcnt %d/%d\n",
                                  what, rkm->offset, expected_offset, cnt,
                                  msgcnt);

                rd_kafka_message_destroy(rkm);
                expected_offset++;
                cnt++;
        }


        TEST_SAY("%s: phase 2: complete\n", what);
        test_consumer_close(rk);
        rd_kafka_destroy(rk);

        TIMING_STOP(&t_all);

        SUB_TEST_PASS();
}


static void empty_offset_commit_cb(rd_kafka_t *rk,
                                   rd_kafka_resp_err_t err,
                                   rd_kafka_topic_partition_list_t *offsets,
                                   void *opaque) {
        rd_kafka_resp_err_t expected = *(rd_kafka_resp_err_t *)opaque;
        int valid_offsets            = 0;
        int i;

        TEST_SAY(
            "Offset commit callback for %d partitions: %s (expecting %s)\n",
            offsets ? offsets->cnt : 0, rd_kafka_err2str(err),
            rd_kafka_err2str(expected));

        if (expected != err)
                TEST_FAIL("Offset commit cb: expected %s, got %s",
                          rd_kafka_err2str(expected), rd_kafka_err2str(err));

        for (i = 0; i < offsets->cnt; i++) {
                TEST_SAY("committed: %s [%" PRId32 "] offset %" PRId64 ": %s\n",
                         offsets->elems[i].topic, offsets->elems[i].partition,
                         offsets->elems[i].offset,
                         rd_kafka_err2str(offsets->elems[i].err));

                if (expected == RD_KAFKA_RESP_ERR_NO_ERROR)
                        TEST_ASSERT(offsets->elems[i].err == expected);
                if (offsets->elems[i].offset > 0)
                        valid_offsets++;
        }

        if (expected == RD_KAFKA_RESP_ERR_NO_ERROR) {
                /* If no error is expected we instead expect one proper offset
                 * to have been committed. */
                TEST_ASSERT(valid_offsets > 0);
        }
}


/**
 * Trigger an empty cgrp commit (issue #803)
 */
static void do_empty_commit(void) {
        rd_kafka_t *rk;
        char group_id[64];
        rd_kafka_conf_t *conf;
        rd_kafka_topic_conf_t *tconf;
        rd_kafka_resp_err_t err, expect;

        SUB_TEST_QUICK();

        test_conf_init(&conf, &tconf, 20);
        test_conf_set(conf, "enable.auto.commit", "false");
        test_topic_conf_set(tconf, "auto.offset.reset", "earliest");
        test_str_id_generate(group_id, sizeof(group_id));

        TEST_SAY(_C_MAG "[ do_empty_commit group.id %s ]\n", group_id);

        rk = test_create_consumer(group_id, NULL, conf, tconf);

        test_consumer_subscribe(rk, topic);

        test_consumer_poll("consume", rk, testid, -1, -1, 100, NULL);

        TEST_SAY("First commit\n");
        expect = RD_KAFKA_RESP_ERR_NO_ERROR;
        err    = rd_kafka_commit_queue(rk, NULL, NULL, empty_offset_commit_cb,
                                    &expect);
        if (err != expect)
                TEST_FAIL("commit failed: %s", rd_kafka_err2str(err));
        else
                TEST_SAY("First commit returned %s\n", rd_kafka_err2str(err));

        TEST_SAY("Second commit, should be empty\n");
        expect = RD_KAFKA_RESP_ERR__NO_OFFSET;
        err    = rd_kafka_commit_queue(rk, NULL, NULL, empty_offset_commit_cb,
                                    &expect);
        if (err != RD_KAFKA_RESP_ERR__NO_OFFSET)
                TEST_FAIL("unexpected commit result, wanted NO_OFFSET, got: %s",
                          rd_kafka_err2str(err));
        else
                TEST_SAY("Second commit returned %s\n", rd_kafka_err2str(err));

        test_consumer_close(rk);

        rd_kafka_destroy(rk);

        SUB_TEST_PASS();
}


/**
 * Commit non-existent topic (issue #704)
 */
static void nonexist_offset_commit_cb(rd_kafka_t *rk,
                                      rd_kafka_resp_err_t err,
                                      rd_kafka_topic_partition_list_t *offsets,
                                      void *opaque) {
        int i;
        int failed_offsets = 0;

        TEST_SAY("Offset commit callback for %d partitions: %s\n",
                 offsets ? offsets->cnt : 0, rd_kafka_err2str(err));

        TEST_ASSERT(offsets != NULL);

        for (i = 0; i < offsets->cnt; i++) {
                TEST_SAY("committed: %s [%" PRId32 "] offset %" PRId64 ": %s\n",
                         offsets->elems[i].topic, offsets->elems[i].partition,
                         offsets->elems[i].offset,
                         rd_kafka_err2str(offsets->elems[i].err));
                failed_offsets += offsets->elems[i].err ? 1 : 0;
        }

        TEST_ASSERT(err == RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART,
                    "expected unknown Topic or partition, not %s",
                    rd_kafka_err2str(err));
        TEST_ASSERT(offsets->cnt == 2, "expected %d offsets", offsets->cnt);
        TEST_ASSERT(failed_offsets == offsets->cnt,
                    "expected %d offsets to have failed, got %d", offsets->cnt,
                    failed_offsets);
}

static void do_nonexist_commit(void) {
        rd_kafka_t *rk;
        char group_id[64];
        rd_kafka_conf_t *conf;
        rd_kafka_topic_conf_t *tconf;
        rd_kafka_topic_partition_list_t *offsets;
        const char *unk_topic = test_mk_topic_name(__FUNCTION__, 1);
        rd_kafka_resp_err_t err;

        SUB_TEST_QUICK();

        test_conf_init(&conf, &tconf, 20);
        /* Offset commit deferrals when the broker is down is limited to
         * session.timeout.ms. With 0.9 brokers and api.version.request=true
         * the initial connect to all brokers will take 10*2 seconds
         * and the commit_queue() below will time out too quickly.
         * Set the session timeout high here to avoid it. */
        test_conf_set(conf, "session.timeout.ms", "60000");

        test_str_id_generate(group_id, sizeof(group_id));
        test_conf_set(conf, "group.id", group_id);

        rd_kafka_conf_set_default_topic_conf(conf, tconf);

        TEST_SAY(_C_MAG "[ do_nonexist_commit group.id %s ]\n", group_id);

        rk = test_create_handle(RD_KAFKA_CONSUMER, conf);
        rd_kafka_poll_set_consumer(rk);

        TEST_SAY("Try nonexist commit\n");
        offsets = rd_kafka_topic_partition_list_new(2);
        rd_kafka_topic_partition_list_add(offsets, unk_topic, 0)->offset = 123;
        rd_kafka_topic_partition_list_add(offsets, unk_topic, 1)->offset = 456;

        err = rd_kafka_commit_queue(rk, offsets, NULL,
                                    nonexist_offset_commit_cb, NULL);
        TEST_SAY("nonexist commit returned %s\n", rd_kafka_err2str(err));
        if (err != RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART)
                TEST_FAIL("commit() should give UnknownTopicOrPart, not: %s",
                          rd_kafka_err2str(err));

        rd_kafka_topic_partition_list_destroy(offsets);

        test_consumer_close(rk);

        rd_kafka_destroy(rk);

        SUB_TEST_PASS();
}


int main_0030_offset_commit(int argc, char **argv) {

        topic  = rd_strdup(test_mk_topic_name(__FUNCTION__, 1));
        testid = test_produce_msgs_easy(topic, 0, partition, msgcnt);

        do_empty_commit();

        do_nonexist_commit();

        do_offset_test("AUTO.COMMIT & AUTO.STORE", 1 /* enable.auto.commit */,
                       1 /* enable.auto.offset.store */, 0 /* not used. */,
                       1 /* use subscribe */);

        do_offset_test("MANUAL.COMMIT.ASYNC & AUTO.STORE",
                       0 /* enable.auto.commit */,
                       1 /* enable.auto.offset.store */, 1 /* async */,
                       1 /* use subscribe */);

        do_offset_test("AUTO.COMMIT.ASYNC & AUTO.STORE & ASSIGN",
                       1 /* enable.auto.commit */,
                       1 /* enable.auto.offset.store */, 0 /* not used. */,
                       0 /* use assign */);

        if (test_quick) {
                rd_free(topic);
                return 0;
        }

        do_offset_test("AUTO.COMMIT & MANUAL.STORE", 1 /* enable.auto.commit */,
                       0 /* enable.auto.offset.store */, 0 /* not used */,
                       1 /* use subscribe */);

        do_offset_test("MANUAL.COMMIT.SYNC & AUTO.STORE",
                       0 /* enable.auto.commit */,
                       1 /* enable.auto.offset.store */, 0 /* async */,
                       1 /* use subscribe */);

        do_offset_test("MANUAL.COMMIT.ASYNC & MANUAL.STORE",
                       0 /* enable.auto.commit */,
                       0 /* enable.auto.offset.store */, 1 /* sync */,
                       1 /* use subscribe */);

        do_offset_test("MANUAL.COMMIT.SYNC & MANUAL.STORE",
                       0 /* enable.auto.commit */,
                       0 /* enable.auto.offset.store */, 0 /* sync */,
                       1 /* use subscribe */);

        rd_free(topic);

        return 0;
}
