#!/bin/bash

# core.COMM.PID-TID
sysctl kernel.core_pattern='core.%e.%p-%P'

OK="\tOK\t\\N\t"
FAIL="\tFAIL\t\\N\t"

FAILURE_CONTEXT_LINES=100
FAILURE_CONTEXT_MAX_LINE_WIDTH=300

function escaped()
{
    # That's the simplest way I found to escape a string in bash. Yep, bash is the most convenient programming language.
    # Also limit lines width just in case (too long lines are not really useful usually)
    clickhouse local -S 's String' --input-format=LineAsString -q "select substr(s, 1, $FAILURE_CONTEXT_MAX_LINE_WIDTH)
      from table format CustomSeparated settings format_custom_row_after_delimiter='\\\\\\\\n'"
}

function head_escaped()
{
    head -n $FAILURE_CONTEXT_LINES $1 | escaped
}

function unts()
{
    grep -Po "[0-9][0-9]:[0-9][0-9] \K.*"
}

function trim_server_logs()
{
    head -n $FAILURE_CONTEXT_LINES "/test_output/$1" | grep -Eo " \[ [0-9]+ \] \{.*" | escaped
}

function install_packages()
{
    dpkg -i $1/clickhouse-common-static_*.deb
    dpkg -i $1/clickhouse-common-static-dbg_*.deb
    dpkg -i $1/clickhouse-server_*.deb
    dpkg -i $1/clickhouse-client_*.deb
}

function configure()
{
    # install test configs
    export USE_DATABASE_ORDINARY=1
    export EXPORT_S3_STORAGE_POLICIES=1
    /usr/share/clickhouse-test/config/install.sh

    # avoid too slow startup
    sudo cat /etc/clickhouse-server/config.d/keeper_port.xml \
      | sed "s|<snapshot_distance>100000</snapshot_distance>|<snapshot_distance>10000</snapshot_distance>|" \
      > /etc/clickhouse-server/config.d/keeper_port.xml.tmp
    sudo mv /etc/clickhouse-server/config.d/keeper_port.xml.tmp /etc/clickhouse-server/config.d/keeper_port.xml
    sudo chown clickhouse /etc/clickhouse-server/config.d/keeper_port.xml
    sudo chgrp clickhouse /etc/clickhouse-server/config.d/keeper_port.xml

    # for clickhouse-server (via service)
    echo "ASAN_OPTIONS='malloc_context_size=10 verbosity=1 allocator_release_to_os_interval_ms=10000'" >> /etc/environment
    # for clickhouse-client
    export ASAN_OPTIONS='malloc_context_size=10 allocator_release_to_os_interval_ms=10000'

    # since we run clickhouse from root
    sudo chown root: /var/lib/clickhouse

    # Set more frequent update period of asynchronous metrics to more frequently update information about real memory usage (less chance of OOM).
    echo "<clickhouse><asynchronous_metrics_update_period_s>1</asynchronous_metrics_update_period_s></clickhouse>" \
        > /etc/clickhouse-server/config.d/asynchronous_metrics_update_period_s.xml

    local total_mem
    total_mem=$(awk '/MemTotal/ { print $(NF-1) }' /proc/meminfo) # KiB
    total_mem=$(( total_mem*1024 )) # bytes

    # Set maximum memory usage as half of total memory (less chance of OOM).
    #
    # But not via max_server_memory_usage but via max_memory_usage_for_user,
    # so that we can override this setting and execute service queries, like:
    # - hung check
    # - show/drop database
    # - ...
    #
    # So max_memory_usage_for_user will be a soft limit, and
    # max_server_memory_usage will be hard limit, and queries that should be
    # executed regardless memory limits will use max_memory_usage_for_user=0,
    # instead of relying on max_untracked_memory

    max_server_memory_usage_to_ram_ratio=0.5
    echo "Setting max_server_memory_usage_to_ram_ratio to ${max_server_memory_usage_to_ram_ratio}"
    cat > /etc/clickhouse-server/config.d/max_server_memory_usage.xml <<EOL
<clickhouse>
    <max_server_memory_usage_to_ram_ratio>${max_server_memory_usage_to_ram_ratio}</max_server_memory_usage_to_ram_ratio>
</clickhouse>
EOL

    local max_users_mem
    max_users_mem=$((total_mem*30/100)) # 30%
    echo "Setting max_memory_usage_for_user=$max_users_mem and max_memory_usage for queries to 10G"
    cat > /etc/clickhouse-server/users.d/max_memory_usage_for_user.xml <<EOL
<clickhouse>
    <profiles>
        <default>
            <max_memory_usage>10G</max_memory_usage>
            <max_memory_usage_for_user>${max_users_mem}</max_memory_usage_for_user>
        </default>
    </profiles>
</clickhouse>
EOL

    cat > /etc/clickhouse-server/config.d/core.xml <<EOL
<clickhouse>
    <core_dump>
        <!-- 100GiB -->
        <size_limit>107374182400</size_limit>
    </core_dump>
    <!-- NOTE: no need to configure core_path,
         since clickhouse is not started as daemon (via clickhouse start)
    -->
    <core_path>$PWD</core_path>
</clickhouse>
EOL

    # Analyzer is not yet ready for testing
    cat > /etc/clickhouse-server/users.d/no_analyzer.xml <<EOL
<clickhouse>
    <profiles>
        <default>
            <constraints>
                <allow_experimental_analyzer>
                    <readonly/>
                </allow_experimental_analyzer>
            </constraints>
        </default>
    </profiles>
</clickhouse>
EOL

}

function stop()
{
    local max_tries="${1:-90}"
    local check_hang="${2:-true}"
    local pid
    # Preserve the pid, since the server can hung after the PID will be deleted.
    pid="$(cat /var/run/clickhouse-server/clickhouse-server.pid)"

    clickhouse stop --max-tries "$max_tries" --do-not-kill && return

    if [ $check_hang == true ]
    then
      # We failed to stop the server with SIGTERM. Maybe it hang, let's collect stacktraces.
      # Add a special status just in case, so it will be possible to find in the CI DB
      echo -e "Warning: server did not stop yet$OK" >> /test_output/test_results.tsv
      kill -TERM "$(pidof gdb)" ||:
      sleep 5

      # The server could finally stop while we were terminating gdb, let's recheck if it's still running
      kill -s 0 $pid || return
      echo -e "Possible deadlock on shutdown (see gdb.log)$FAIL" >> /test_output/test_results.tsv
      echo "thread apply all backtrace (on stop)" >> /test_output/gdb.log
      timeout 30m gdb -batch -ex 'thread apply all backtrace' -p "$pid" | ts '%Y-%m-%d %H:%M:%S' >> /test_output/gdb.log
      clickhouse stop --force
    fi
}

function start()
{
    counter=0
    until clickhouse-client --query "SELECT 1"
    do
        if [ "$counter" -gt ${1:-120} ]
        then
            echo "Cannot start clickhouse-server"
            rg --text "<Error>.*Application" /var/log/clickhouse-server/clickhouse-server.log > /test_output/application_errors.txt ||:
            echo -e "Cannot start clickhouse-server$FAIL$(trim_server_logs application_errors.txt)" >> /test_output/test_results.tsv
            cat /var/log/clickhouse-server/stdout.log
            tail -n100 /var/log/clickhouse-server/stderr.log
            tail -n100000 /var/log/clickhouse-server/clickhouse-server.log | rg -F -v -e '<Warning> RaftInstance:' -e '<Information> RaftInstance' | tail -n100
            break
        fi
        # use root to match with current uid
        clickhouse start --user root >/var/log/clickhouse-server/stdout.log 2>>/var/log/clickhouse-server/stderr.log
        sleep 0.5
        counter=$((counter + 1))
    done

    attach_gdb_to_clickhouse
}

function check_server_start()
{
    clickhouse-client --query "SELECT 'Server successfully started', 'OK', NULL, ''" >> /test_output/test_results.tsv \
        || (rg --text "<Error>.*Application" /var/log/clickhouse-server/clickhouse-server.log > /test_output/application_errors.txt \
        && echo -e "Server failed to start (see application_errors.txt and clickhouse-server.clean.log)$FAIL$(trim_server_logs application_errors.txt)" \
        >> /test_output/test_results.tsv)

    # Remove file application_errors.txt if it's empty
    [ -s /test_output/application_errors.txt ] || rm /test_output/application_errors.txt
}

function check_logs_for_critical_errors()
{
    # Sanitizer asserts
    rg -Fa "==================" /var/log/clickhouse-server/stderr.log | rg -v "in query:" >> /test_output/tmp
    rg -Fa "WARNING" /var/log/clickhouse-server/stderr.log >> /test_output/tmp
    rg -Fav -e "ASan doesn't fully support makecontext/swapcontext functions" -e "DB::Exception" /test_output/tmp > /dev/null \
        && echo -e "Sanitizer assert (in stderr.log)$FAIL$(head_escaped /test_output/tmp)" >> /test_output/test_results.tsv \
        || echo -e "No sanitizer asserts$OK" >> /test_output/test_results.tsv
    rm -f /test_output/tmp

    # OOM
    rg -Fa " <Fatal> Application: Child process was terminated by signal 9" /var/log/clickhouse-server/clickhouse-server*.log > /dev/null \
        && echo -e "Signal 9 in clickhouse-server.log$FAIL" >> /test_output/test_results.tsv \
        || echo -e "No OOM messages in clickhouse-server.log$OK" >> /test_output/test_results.tsv

    # Logical errors
    rg -Fa "Code: 49. DB::Exception: " /var/log/clickhouse-server/clickhouse-server*.log > /test_output/logical_errors.txt \
        && echo -e "Logical error thrown (see clickhouse-server.log or logical_errors.txt)$FAIL$(head_escaped /test_output/logical_errors.txt)" >> /test_output/test_results.tsv \
        || echo -e "No logical errors$OK" >> /test_output/test_results.tsv
    # Remove file logical_errors.txt if it's empty
    [ -s /test_output/logical_errors.txt ] || rm /test_output/logical_errors.txt

    # No such key errors
    rg --text "Code: 499.*The specified key does not exist" /var/log/clickhouse-server/clickhouse-server*.log > /test_output/no_such_key_errors.txt \
        && echo -e "S3_ERROR No such key thrown (see clickhouse-server.log or no_such_key_errors.txt)$FAIL$(trim_server_logs no_such_key_errors.txt)" >> /test_output/test_results.tsv \
        || echo -e "No lost s3 keys$OK" >> /test_output/test_results.tsv

    # Remove file no_such_key_errors.txt if it's empty
    [ -s /test_output/no_such_key_errors.txt ] || rm /test_output/no_such_key_errors.txt

    # Crash
    rg -Fa "########################################" /var/log/clickhouse-server/clickhouse-server*.log > /dev/null \
        && echo -e "Killed by signal (in clickhouse-server.log)$FAIL" >> /test_output/test_results.tsv \
        || echo -e "Not crashed$OK" >> /test_output/test_results.tsv

    # It also checks for crash without stacktrace (printed by watchdog)
    rg -Fa " <Fatal> " /var/log/clickhouse-server/clickhouse-server*.log > /test_output/fatal_messages.txt \
        && echo -e "Fatal message in clickhouse-server.log (see fatal_messages.txt)$FAIL$(trim_server_logs fatal_messages.txt)" >> /test_output/test_results.tsv \
        || echo -e "No fatal messages in clickhouse-server.log$OK" >> /test_output/test_results.tsv

    # Remove file fatal_messages.txt if it's empty
    [ -s /test_output/fatal_messages.txt ] || rm /test_output/fatal_messages.txt

    rg -Faz "########################################" /test_output/* > /dev/null \
      && echo -e "Killed by signal (output files)$FAIL" >> /test_output/test_results.tsv

    function get_gdb_log_context()
    {
        rg -A50 -Fa " received signal " /test_output/gdb.log | head_escaped
    }

    rg -Fa " received signal " /test_output/gdb.log > /dev/null \
        && echo -e "Found signal in gdb.log$FAIL$(get_gdb_log_context)" >> /test_output/test_results.tsv

    dmesg -T > /test_output/dmesg.log

    # OOM in dmesg -- those are real
    grep -q -F -e 'Out of memory: Killed process' -e 'oom_reaper: reaped process' -e 'oom-kill:constraint=CONSTRAINT_NONE' /test_output/dmesg.log \
        && echo -e "OOM in dmesg$FAIL$(head_escaped /test_output/dmesg.log)" >> /test_output/test_results.tsv \
        || echo -e "No OOM in dmesg$OK" >> /test_output/test_results.tsv
}

function collect_query_and_trace_logs()
{
    for table in query_log trace_log
    do
        clickhouse-local --path /var/lib/clickhouse/ --only-system-tables -q "select * from system.$table format TSVWithNamesAndTypes" | zstd --threads=0 > /test_output/$table.tsv.zst ||:
    done
}

function collect_core_dumps()
{
  find . -type f -maxdepth 1 -name 'core.*' | while read core; do
      zstd --threads=0 $core
      mv $core.zst /test_output/
  done
}