service_management.lib #1

# shellcheck shell=bash
           
#==============================================================================
# Copyright and license info is available in the LICENSE file included with
# the Server Deployment Package (SDP), and also available online:
# https://swarm.workshop.perforce.com/projects/perforce-software-sdp/view/main/LICENSE
#------------------------------------------------------------------------------

#==============================================================================
# This library contains functions related to service management.

#------------------------------------------------------------------------------
# Function: svc_is_up ($server, $instance)
#
# Input:
# $1 - server, one of 'p4d', 'p4p', or 'p4broker'
# $2 - instance, e.g. '1', 'xyz'
#
# Output: None
#
# Return Codes:
# 0: Server is up.
# 1: Server is down.
# 2: Bad usage.
#
# Server up/down status is checked using the appropriate init script.
#------------------------------------------------------------------------------
function svc_is_up () {
   local server="${1:-Unset}"
   local instance="${1:-Unset}"

   case "$server" in
      (p4d)
         "$P4DInitScript" status > /dev/null 2>&1
         return $?
      ;;
      (p4broker)
         "$P4BrokerInitScript" status > /dev/null 2>&1
         return $?
      ;;
      (p4p)
        "$P4ProxyInitScript" status > /dev/null 2>&1
         return $?
      ;;
      (Unset)
         errmsg "Internal Error: svc_is_up(): No server type specified."
         return  2
      ;;
      (*)
         errmsg "Internal Error: svc_is_up(): Unknown server specified: $server"
         return 2
      ;;
   esac
}

#------------------------------------------------------------------------------
# Shutdown p4d using systemd if configured for systemd. Otherwise call the
# underlying init script directly.
#
#------------------------------------------------------------------------------
function svc_stop_p4d () {
   msg "Shutting down the ${P4DBIN##*/} server."
   local -i maxStopDelay=${SDP_MAX_STOP_DELAY_P4D:-43200}
   local -i stopVerified=0
   local -i i=0
   local -i useSystemd=0
   local serviceName=

   if [[ -n "$(command -v systemctl)" && ! -r /.dockerenv ]]; then
      serviceName="${P4DBIN##*/}"
      if [[ -n "$(systemctl is-enabled "$serviceName" 2>/dev/null)" ]]; then
         useSystemd=1
      fi
   fi

   if [[ "$useSystemd" -eq 1 ]]; then
      sudo systemctl stop "${P4DBIN##*/}" ||\
         bail "Failed to execute: sudo systemctl stop ${P4DBIN##*/}"

      # With systemd, we must independently confirm service stop,
      # waiting if needed.
      stopVerified=0
      i=0; while [[ "$i" -lt "$maxStopDelay" ]]; do
         if svc_is_up p4d; then
            sleep 1
         else
            stopVerified=1
            break
         fi
         i+=1
      done
   else
      "$P4DInitScript" stop
      stopVerified=1
   fi

   if [[ "$stopVerified" -eq 1 ]]; then
      msg "Stopped ${P4DBIN##*/} server."
      return 0
   else
      errmsg "Server ${P4DBIN##*/} did not stop after $maxStopDelay seconds. Tailing $P4LOG:"
      tail "$P4LOG"
      bail "Aborting due to failed p4d stop."
   fi
}

#------------------------------------------------------------------------------
# Shutdown p4broker using systemd if configured for systemd. Otherwise call the
# underlying init script directly.
#
#------------------------------------------------------------------------------
function svc_stop_p4broker () {
   msg "Shutting down the ${P4BROKERBIN##*/} server."
   local -i maxStopDelay=${SDP_MAX_STOP_DELAY_P4BROKER:-600}
   local -i stopVerified=0
   local -i i=0
   local -i useSystemd=0
   local serviceName=

   if [[ -n "$(command -v systemctl)" ]]; then
      serviceName="${P4BROKERBIN##*/}"
      if [[ -n "$(systemctl is-enabled "$serviceName" 2>/dev/null)" ]]; then
         useSystemd=1
      fi
   fi

   if [[ "$useSystemd" -eq 1 ]]; then
      sudo systemctl stop "${P4BROKERBIN##*/}"
         bail "Failed to execute: sudo systemctl stop ${P4BROKERBIN##*/}"

      # With systemd, we must independently confirm service stop,
      # waiting if needed.
      stopVerified=0
      i=0; while [[ "$i" -lt "$maxStopDelay" ]]; do
         if svc_is_up p4broker; then
            sleep 1
         else
            stopVerified=1
            break
         fi
         i+=1
      done
   else
      "$P4BrokerInitScript" stop
      stopVerified=1
   fi

   if [[ "$stopVerified" -eq 1 ]]; then
      msg "Stopped ${P4BROKERBIN##*/} server."
      return 0
   else
      bail "Server ${P4BROKERBIN##*/} did not stop after $maxStopDelay seconds."
   fi
}

#------------------------------------------------------------------------------
# Shutdown p4p using systemd if configured for systemd. Otherwise call the
# underlying init script directly.
#
#------------------------------------------------------------------------------
function svc_stop_p4p () {
   msg "Shutting down the ${P4PBIN##*/} server."
   local -i maxStopDelay=${SDP_MAX_STOP_DELAY_P4P:-600}
   local -i stopVerified=0
   local -i i=0
   local -i useSystemd=0
   local serviceName=

   if [[ -n "$(command -v systemctl)" ]]; then
      serviceName="${P4PBIN##*/}"
      if [[ -n "$(systemctl is-enabled "$serviceName" 2>/dev/null)" ]]; then
         useSystemd=1
      fi
   fi

   if [[ "$useSystemd" -eq 1 ]]; then
      sudo systemctl stop "${P4PBIN##*/}"
         bail "Failed to execute: sudo systemctl stop ${P4PBIN##*/}"

      # With systemd, we must independently confirm service stop,
      # waiting if needed.
      stopVerified=0
      i=0; while [[ "$i" -lt "$maxStopDelay" ]]; do
         if svc_is_up p4p; then
            sleep 1
         else
            stopVerified=1
            break
         fi
         i+=1
      done
   else
      "$P4ProxyInitScript" stop
      stopVerified=1
   fi

   if [[ "$stopVerified" -eq 1 ]]; then
      msg "Stopped ${P4PBIN##*/} server."
      return 0
   else
      bail "Server ${P4PBIN##*/} did not stop after $maxStopDelay seconds."
   fi
}

#------------------------------------------------------------------------------
# Start p4d using systemd if configured for systemd. Otherwise call the
# underlying init script directly.
#
# This is a do-or-die function. It returns success upon successful server
# startup, or else dies.
#------------------------------------------------------------------------------
function svc_start_p4d () {
   msg "Starting the ${P4DBIN##*/} server."
   local -i maxStartDelay=${SDP_MAX_START_DELAY_P4D:-120}
   local -i startVerified=0
   local -i i=0
   local -i useSystemd=0
   local serviceName=

   if [[ -n "$(command -v systemctl)" && ! -r /.dockerenv ]]; then
      serviceName="${P4DBIN##*/}"
      if [[ -n "$(systemctl is-enabled "$serviceName" 2>/dev/null)" ]]; then
         useSystemd=1
      fi
   fi

   if [[ "$useSystemd" -eq 1 ]]; then
      { sudo systemctl start "${P4DBIN##*/}"; } ||\
         bail "Failed to execute: sudo systemctl start ${P4DBIN##*/}"
   else
      "$P4DInitScript" start
   fi

   # Confirm that p4d started, waiting if needed.
   startVerified=0
   i=0; while [[ "$i" -lt "$maxStartDelay" ]]; do
      if svc_is_up p4d; then
         startVerified=1
         break
      else
         sleep 1
      fi
      i+=1
   done

   if [[ "$startVerified" -eq 1 ]]; then
      msg "Server ${P4DBIN##*/} started successfully."
      return 0
   else
      errmsg "Server ${P4DBIN##*/} did not start after $maxStartDelay seconds. Tailing $P4LOG:"
      tail "$P4LOG"
      bail "Aborting due to failed p4d start."
   fi
}

#------------------------------------------------------------------------------
# Start p4broker using systemd if configured for systemd. Otherwise call the
# underlying init script directly.
#
# This is a do-or-die function. It returns success upon successful server
# startup, or else dies.
#------------------------------------------------------------------------------
function svc_start_p4broker () {
   msg "Starting the ${P4BROKERBIN##*/} server."
   local -i maxStartDelay=${SDP_MAX_START_DELAY_P4BROKER:-60}
   local -i startVerified=0
   local -i i=0
   local -i useSystemd=0
   local serviceName=

   if [[ -n "$(command -v systemctl)" ]]; then
      serviceName="${P4BROKERBIN##*/}"
      if [[ -n "$(systemctl is-enabled "$serviceName" 2>/dev/null)" ]]; then
         useSystemd=1
      fi
   fi

   if [[ "$useSystemd" -eq 1 ]]; then
      { sudo systemctl start "${P4BROKERBIN##*/}"; } ||\
         bail "Failed to execute: sudo systemctl start ${P4BROKERBIN##*/}"
   else
      "$P4BrokerInitScript" start
   fi

   # Confirm that p4broker started, waiting if needed.
   startVerified=0
   i=0; while [[ "$i" -lt "$maxStartDelay" ]]; do
      if svc_is_up p4broker; then
         startVerified=1
         break
      else
         sleep 1
      fi
      i+=1
   done

   if [[ "$startVerified" -eq 1 ]]; then
      msg "Server ${P4BROKERBIN##*/} started successfully."
      return 0
   else
      bail "Server ${P4BROKERBIN##*/} did not start after $maxStartDelay seconds."
   fi
}

#------------------------------------------------------------------------------
# Start p4p using systemd if configured for systemd. Otherwise call the
# underlying init script directly.
#
# This is a do-or-die function. It returns success upon successful server
# startup, or else dies.
#------------------------------------------------------------------------------
function svc_start_p4p () {
   msg "Starting the ${P4PBIN##*/} server."
   local -i maxStartDelay=${SDP_MAX_START_DELAY_P4P:-60}
   local -i startVerified=0
   local -i i=0
   local -i useSystemd=0
   local serviceName=

   if [[ -n "$(command -v systemctl)" ]]; then
      serviceName="${P4PBIN##*/}"
      if [[ -n "$(systemctl is-enabled "$serviceName" 2>/dev/null)" ]]; then
         useSystemd=1
      fi
   fi

   if [[ "$useSystemd" -eq 1 ]]; then
      { sudo systemctl start "${P4PBIN##*/}"; } ||\
         bail "Failed to execute: sudo systemctl start ${P4PBIN##*/}"
   else
      "$P4ProxyInitScript" start
   fi

   # Confirm that p4p started, waiting if needed.
   startVerified=0
   i=0; while [[ "$i" -lt "$maxStartDelay" ]]; do
      if svc_is_up p4p; then
         startVerified=1
         break
      else
         sleep 1
      fi
      i+=1
   done

   if [[ "$startVerified" -eq 1 ]]; then
      msg "Server ${P4PBIN##*/} started successfully."
      return 0
   else
      bail "Server ${P4PBIN##*/} did not start after $maxStartDelay seconds."
   fi
}