# Common definitions for all test suites in test/*

testdefs_sh=$(abspath "${BASH_SOURCE[0]}")
servald_source_root="${testdefs_sh%/*}"
servald_build_root="$servald_source_root"

declare -a instance_stack=()

# Some useful regular expressions.  These must work in grep(1) as basic
# expressions, and also in sed(1).
rexp_sid='[0-9a-fA-F]\{64\}'

# Utility function for creating servald fixtures:
#  - set $servald variable (executable under test)
#  - set the current instance to be "Z"
setup_servald() {
   servald=$(abspath "$servald_build_root/dna") # The servald executable under test
   if ! [ -x "$servald" ]; then
      error "servald executable not present: $servald"
      return 1
   fi
   servald_basename="${servald##*/}"
   set_instance +Z
}

# Utility function for running servald and asserting no errors:
#  - executes $servald with the given arguments
#  - asserts that standard error contains no error messages
executeOk_servald() {
   executeOk --executable="$servald" "$@"
   assertStderrGrep --matches=0 --message='stderr of $executed contains no error messages' '^ERROR:'
}

# Utility function:
#  - if the argument is a prefixed instance name "+X", then call set_instance
#    "X" and return 0, otherwise leave the current instance unchanged and return 1
# Designed for use in functions that take an optional instance name as their
# first argument:
#     func() {
#        push_instance
#        set_instance_fromarg "$1" && shift
#        ...
#        pop_instance
#     }
# would be invoked as:
#     func +A blah blah
#     func +B wow wow
#     func foo bar
set_instance_fromarg() {
   case "$1" in
   +[A-Z]) set_instance "$1"; return 0;;
   esac
   return 1
}

# Utility function:
#  - push the current instance on the instance stack
push_instance() {
   instance_stack+=("$instance_name")
}

# Utility function:
#  - pop an instance off the instance stack
pop_instance() {
   local n=${#instance_stack[*]}
   [ $n -eq 0 ] && error "instance stack underflow"
   let --n
   unset instance_stack[$n]
}

# Utility function:
#  - create a temporary directory to contain all per-instance test files
#  - set SERVALINSTANCE_PATH environment variable to name a directory within
#    the per-instance test directory (but do not create it)
#  - set other environment variables to support other functions defined in this
#    script
set_instance() {
   case "$1" in
   '')
      error "missing instance name argument"
      ;;
   +[A-Z])
      instance_name="${1#+}"
      echo "# set instance = $instance_name"
      export instance_dir="$TFWTMP/instance/$instance_name"
      mkdir -p "$instance_dir"
      export instance_servald_log="$instance_dir/servald.log"
      export SERVALINSTANCE_PATH="$instance_dir/servald"
      export instance_servald_pidfile="$SERVALINSTANCE_PATH/servald.pid"
      ;;
   *)
      error "malformed instance name argument, must be in form +[A-Z]"
      ;;
   esac
}

# Utility function for setting up servald JNI fixtures:
#  - check that libservald.so is present
#  - set LD_LIBRARY_PATH so that libservald.so can be found
setup_servald_so() {
   assert [ -r "$servald_build_root/libservald.so" ]
   export LD_LIBRARY_PATH="$servald_build_root"
}

# Utility function for setting up a fixture with a servald server process:
#  - Ensure that no servald processes are running
#  - Start a servald server process
#  - Ensure that it is still running after one second
start_servald_server() {
   push_instance
   set_instance_fromarg "$1" && shift
   executeOk $servald config set logfile "$instance_servald_log"
   # Start servald server
   local -a before_pids
   local -a after_pids
   get_servald_pids before_pids
   echo "# before_pids=$before_pids"
   unset SERVALD_OUTPUT_DELIMITER
   executeOk $servald start "$@"
   tfw_cat --stdout
   get_servald_pids after_pids
   echo "# after_pids=$after_pids"
   # Assert that the servald pid file is present.
   assert --message="servald pidfile was created" [ -s "$instance_servald_pidfile" ]
   servald_pid=$(cat "$instance_servald_pidfile")
   assert --message="servald pidfile contains a valid pid" --dump-on-fail="$instance_servald_log" kill -0 "$servald_pid"
   # Assert that there is at least one new servald process running.
   local apid bpid
   local new_pids=
   local pidfile_running=false
   for apid in ${after_pids[*]}; do
      local isnew=true
      for bpid in ${before_pids[*]}; do
         if [ "$apid" -eq "$bpid" ]; then
            isnew=false
            break
         fi
      done
      if [ "$apid" -eq "$servald_pid" ]; then
         echo "# started servald process: pid=$servald_pid"
         new_pids="$new_pids $apid"
         pidfile_running=true
      elif $isnew; then
         echo "# unknown new servald process: pid=$apid"
         new_pids="$new_pids $apid"
      fi
   done
   assert --message="a new servald process is running" --dump-on-fail="$instance_servald_log" [ -n "$new_pids" ]
   assert --message="servald pidfile process is running" --dump-on-fail="$instance_servald_log" $pidfile_running
   echo "# Started servald server process $instance_name, pid=$servald_pid"
   pop_instance
}

# Utility function:
#  - stop a servald server process instance in an orderly fashion
#  - cat its log file into the test log
stop_servald_server() {
   push_instance
   set_instance_fromarg "$1" && shift
   # Stop servald server
   servald_pid=$(cat "$instance_servald_pidfile")
   local -a before_pids
   local -a after_pids
   get_servald_pids before_pids
   echo "# before_pids=$before_pids"
   unset SERVALD_OUTPUT_DELIMITER
   executeOk $servald stop "$@"
   tfw_cat --stdout
   echo "# Stopped servald server process $instance_name, pid=${servald_pid:-unknown}"
   get_servald_pids after_pids
   echo "# after_pids=$after_pids"
   # Assert that the servald pid file is gone.
   assert --message="servald pidfile was removed" [ ! -e "$instance_servald_pidfile" ]
   # Assert that the servald process identified by the pidfile is no longer running.
   local apid bpid
   if [ -n "$servald_pid" ]; then
      for apid in ${after_pids[*]}; do
         assert --message="servald process still running" [ "$apid" -ne "$servald_pid" ]
      done
   fi
   # Append the server log file to the test log.
   [ -s "$instance_servald_log" ] && tfw_cat "$instance_servald_log"
   # Check there is at least one fewer servald processes running.
   for bpid in ${before_pids[*]}; do
      local isgone=true
      for apid in ${after_pids[*]}; do
         if [ "$apid" -eq "$bpid" ]; then
            isgone=false
            break
         fi
      done
      if $isgone; then
         echo "# ended servald process: pid=$bpid"
      fi
   done
   pop_instance
}

# Utility function for tearing down servald fixtures:
#  - stop all servald server process instances in an orderly fashion
stop_all_servald_servers() {
   push_instance
   if pushd "$TFWTMP/instance" >/dev/null; then
      for name in *; do
         set_instance "+$name"
         stop_servald_server
      done
      popd >/dev/null
   fi
   pop_instance
}

# Utility function for tearing down servald fixtures:
#  - send a given signal to all running servald processes, identified by name
#  - return 1 if no processes were present, 0 if any signal was sent
signal_all_servald_processes() {
   local sig="$1"
   local servald_pids
   get_servald_pids servald_pids
   local pid
   local ret=1
   for pid in $servald_pids; do
      if kill -$sig "$pid"; then
         echo "# Sent SIG$sig to servald process pid=$pid"
         ret=0
      else
         echo "# servald process pid=$pid not running -- SIG$sig not sent"
      fi
   done
   return $ret
}

# Utility function for tearing down servald fixtures:
#  - wait while any servald processes remain
#  - return 0 if no processes are present
#  - 1 if the timeout elapses first
wait_all_servald_processes() {
   local timeout="${1:-1000000}"
   sleep $timeout &
   sleep_pid=$!
   while get_servald_pids; do
      kill -0 $sleep_pid 2>/dev/null || return 1
      sleep 0.1
      _tfw_echo -n .
   done
   kill -TERM $sleep_pid 2>/dev/null
   return 0
}

# Utility function for tearing down servald fixtures:
#  - terminate all running servald processes, identified by name, by sending
#    two SIGHUPs 100ms apart, then another SIGHUP after 2 seconds, finally
#    SIGKILL after 2 seconds
#  - return 0 if no more processes are running, nonzero otherwise
kill_all_servald_processes() {
   for delay in 0.1 2 2; do
      signal_all_servald_processes HUP || return 0
      wait_all_servald_processes $delay && return 0
   done
   signal_all_servald_processes KILL || return 0
   return 1
}

# Utility function:
#  - return the PIDs of all servald processes the current user is running in the
#    named array variable (if no name given, do not set any variable)
#  - return 0 if there are any servald processes running, 1 if not
get_servald_pids() {
   local var="$1"
   if [ -z "$servald" ]; then
      error "\$servald is not set"
      return 1
   fi
   local mypid=$$
   # XXX The following line will not find any PIDs if there are spaces in "$servald".
   local pids=$(ps -u$UID -o pid,args | awk -v mypid="$mypid" -v servald="$servald" '$1 != mypid && $2 == servald {print $1}')
   [ -n "$var" ] && eval "$var=($pids)"
   [ -n "$pids" ]
}

# Assertion function:
#  - assert there are no existing servald server processes
assert_no_servald_processes() {
   local pids
   get_servald_pids pids
   assert --message="$servald_basename process(es) running: $pids" [ -z "$pids" ]
   return 0
}

# Assertion function:
#  - assert the given instance's servald server log contains no errors
assert_servald_server_no_errors() {
   assertStderrGrep --matches=0 --message='stderr of $executed contains no error messages' '^ERROR:'
}