earthgecko · earthgecko · Nov 1, 2020 · Nov 1, 2020
diff --git a/bin/snab_flux_load_test.d b/bin/snab_flux_load_test.d
@@ -0,0 +1,397 @@
+#!/bin/bash
+
+# This is used to start the python daemon_runner and issue kill to the parent
+# process.  Originally a stop call was made to the python daemon_runner which
+# initiated a new instance of the agent and the agent's main module, this often
+# resulted in the daemon_runner overwritting to the Skyline app log file due to
+# complexities in the python logging context relating to log handlers and the
+# use of multiprocessing.  These stop calls are no longer made directly to the
+# agent and they are made directly to the parent pid.  In terms of the
+# python-daemon this is exactly what initiating a new agent does, the
+# python-daemon simply issues a os.kill pid, however initiating a new instance
+# of the application results in a new daemon_runner that cannot preserve the
+# log file object of the running daemon_runner in terms of:
+# daemon_context.files_preserve = [handler.stream]
+# which results in the log file being overwritten.
+
+CURRENT_DIR=$(dirname "${BASH_SOURCE[0]}")
+#BASEDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )/.."
+BASEDIR=$(dirname "$CURRENT_DIR")
+
+RETVAL=0
+
+SERVICE_NAME="snab"
+SUB_SERVICE_NAME="${SERVICE_NAME}_flux_load_test"
+
+PID=$$
+
+# Python virtualenv support
+# A skyline.conf can be used for passing any additional variables to this script
+# This was specifically added to allow for the operator to run in a virtualenv
+# environment with whichever version of python they choose to run.  Some simple
+# sanity checks are made if a virtualenv is used
+if [ -f /etc/skyline/skyline.conf ]; then
+  # Test the config file has sensible variables
+  bash -n /etc/skyline/skyline.conf
+  if [ $? -eq 0 ]; then
+    . /etc/skyline/skyline.conf
+  else
+    echo "error: There is a syntax error in /etc/skyline/skyline.conf, try bash -n /etc/skyline/skyline.conf"
+    exit 1
+  fi
+fi
+USE_VIRTUALENV=0
+if [ "$PYTHON_VIRTUALENV" == "true" ]; then
+  if [ ! -f "$USE_PYTHON" ]; then
+    echo "error: The python binary specified does not exists as specified as USE_PYTHON in /etc/skyline/skyline.conf"
+    exit 1
+  fi
+# Test the python binary
+  $USE_PYTHON --version > /dev/null 2>&1
+  if [ $? -eq 0 ]; then
+    USE_VIRTUALENV=1
+  else
+    echo "error: The python binary specified does not execute as expected as specified as USE_PYTHON in /etc/skyline/skyline.conf"
+    exit 1
+  fi
+fi
+
+# Determine LOG and PID PATHs from the settings.py
+if [ ! -f "$BASEDIR/skyline/settings.py" ]; then
+  echo "error: The Skyline settings.py was not found at $BASEDIR/skyline/settings.py"
+  exit 1
+fi
+LOG_PATH=$(cat "$BASEDIR/skyline/settings.py" | grep -v "^#" | grep "^LOG_PATH = " | sed -e "s/.*= //;s/'//g" | sed -e 's/"//g')
+if [ ! -d "$LOG_PATH" ]; then
+  echo "error: The LOG_PATH directory in $BASEDIR/skyline/settings.py does not exist"
+  exit 1
+fi
+PID_PATH=$(cat "$BASEDIR/skyline/settings.py" | grep -v "^#" | grep "^PID_PATH = " | sed -e "s/.*= //;s/'//g" | sed -e 's/"//g')
+if [ ! -d "$PID_PATH" ]; then
+  echo "error: The PID_PATH directory in $BASEDIR/skyline/settings.py does not exist"
+  exit 1
+fi
+SKYLINE_TMP_DIR=$(cat "$BASEDIR/skyline/settings.py" | grep -v "^#" | grep "^SKYLINE_TMP_DIR = " | sed -e "s/.*= //;s/'//g" | sed -e 's/"//g')
+if [ ! -d "$SKYLINE_TMP_DIR" ]; then
+  echo "notice: The SKYLINE_TMP_DIR directory in $BASEDIR/skyline/settings.py does not exist, creating"
+  mkdir -p "$SKYLINE_TMP_DIR"
+fi
+
+# @added 20200415 - Branch #3262: py3
+# Handle using a skyline user that does not have sudo access
+CURRENT_USER=$(whoami)
+USE_SUDO="sudo"
+if [ "$CURRENT_USER" == "skyline" ]; then
+  USE_SUDO=""
+fi
+
+# Check if it is running and if so its state
+RESTART=0
+RUNNING=0
+VALID_PIDFILE=0
+VALID_PID=0
+PROCESS_STALLED=0
+if [ -f "$PID_PATH/${SUB_SERVICE_NAME}.pid" ]; then
+  RUNNING=1
+  RUNNING_PID=$(cat "$PID_PATH/${SUB_SERVICE_NAME}.pid" | head -n 1)
+  # Is the RUNNING_PID a valid number?
+  # shellcheck disable=SC2065
+  test "$RUNNING_PID" -gt 1 > /dev/null 2>&1
+  if [ $? -eq 0 ]; then
+    VALID_PIDFILE=1
+  fi
+  if [ $VALID_PIDFILE -eq 1 ]; then
+    if [ -f "/proc/$RUNNING_PID/status" ]; then
+      RUNNING=1
+      VALID_PID=1
+    else
+      PROCESS_STALLED=1
+    fi
+  fi
+fi
+
+status () {
+
+# As per http://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
+# 0	program is running or service is OK
+# 1	program is dead and /var/run pid file exists
+# 2	program is dead and /var/lock lock file exists
+# 3	program is not running
+# 4	program or service status is unknown
+
+    if [[ $RUNNING -eq 1 && $VALID_PIDFILE -eq 1 ]]; then
+      echo "${SUB_SERVICE_NAME} is running with pid $RUNNING_PID"
+      return 0
+    fi
+
+    if [ $PROCESS_STALLED -eq 1 ]; then
+      echo "${SUB_SERVICE_NAME} is dead and pid file exists - $PID_PATH/${SUB_SERVICE_NAME}.pid"
+      return 1
+    fi
+
+    if [ $RUNNING -eq 0 ]; then
+      echo "${SUB_SERVICE_NAME} is not running"
+      return 3
+    fi
+
+}
+
+start () {
+
+    if [ $RESTART -eq 1 ]; then
+      # These a reset for the restart context
+      RUNNING=0
+      VALID_PIDFILE=0
+      VALID_PID=0
+      PROCESS_STALLED=0
+    fi
+
+    if [ $PROCESS_STALLED -eq 1 ]; then
+      echo "${SUB_SERVICE_NAME} is dead but pid file exists - $PID_PATH/${SUB_SERVICE_NAME}.pid"
+      return 1
+    fi
+
+    if [[ $RUNNING -eq 1 && $VALID_PIDFILE -eq 0 ]]; then
+      echo "error: A pid file exists for ${SUB_SERVICE_NAME} with no valid pid $PID_PATH/${SUB_SERVICE_NAME}.pid"
+      return 1
+    fi
+
+    if [[ $RUNNING -eq 1 && $VALID_PID -eq 1 ]]; then
+      echo "${SUB_SERVICE_NAME} is already running with pid $RUNNING_PID"
+      return 0
+    fi
+
+    rm -f "$BASEDIR/skyline/${SERVICE_NAME}/*.pyc"
+    if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log" ]; then
+      cat "$LOG_PATH/${SUB_SERVICE_NAME}.log" > "$LOG_PATH/${SUB_SERVICE_NAME}.log.last"
+    fi
+
+    touch "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock"
+    touch "$LOG_PATH/${SUB_SERVICE_NAME}.log.wait"
+
+    if [ -f "$BASEDIR/skyline/settings.pyc" ]; then
+      rm -f "$BASEDIR/skyline/settings.pyc"
+    fi
+
+    if [ $USE_VIRTUALENV -eq 0 ]; then
+      /usr/bin/env python "$BASEDIR/skyline/${SERVICE_NAME}/snab_flux_load_test_agent.py" start
+    else
+      $USE_PYTHON "$BASEDIR/skyline/${SERVICE_NAME}/snab_flux_load_test_agent.py" start
+    fi
+    RETVAL=$?
+
+    if [ $RETVAL -ne 0 ]; then
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.last" ]; then
+        cat "$LOG_PATH/${SUB_SERVICE_NAME}.log.last" "$LOG_PATH/${SUB_SERVICE_NAME}.log" > "$LOG_PATH/${SUB_SERVICE_NAME}.log.new"
+        cat "$LOG_PATH/${SUB_SERVICE_NAME}.log.new" > "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.last"
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.new"
+      fi
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.wait" ]; then
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.wait"
+      fi
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock" ]; then
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock"
+      fi
+      echo "error - failed to start ${SUB_SERVICE_NAME}"
+      return $RETVAL
+    fi
+
+    PROCESS_WAITING=0
+    NOW=$(date +%s)
+    WAIT_FOR=$((NOW+5))
+    while [ $NOW -lt $WAIT_FOR ];
+    do
+      if [ ! -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.wait" ]; then
+        NOW=$((WAIT_FOR+1))
+        PROCESS_WAITING=1
+        echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: process removed log.wait file, starting log management" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      else
+        sleep .2
+        NOW=$(date +%s)
+      fi
+    done
+
+    if [ -f "$PID_PATH/${SUB_SERVICE_NAME}.pid" ]; then
+      RUNNING_PID=$(cat "$PID_PATH/${SUB_SERVICE_NAME}.pid" | head -n 1)
+    else
+      RUNNING_PID="unknown"
+    fi
+
+    if [ $PROCESS_WAITING -eq 0 ]; then
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.wait" ]; then
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.wait"
+      fi
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock" ]; then
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock"
+      fi
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: error - log management failed" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      echo "${SUB_SERVICE_NAME} started with pid $RUNNING_PID, but log management failed"
+    fi
+
+    if [ $PROCESS_WAITING -eq 1 ]; then
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.last" ]; then
+        cat "$LOG_PATH/${SUB_SERVICE_NAME}.log.last" "$LOG_PATH/${SUB_SERVICE_NAME}.log" > "$LOG_PATH/${SUB_SERVICE_NAME}.log.new"
+        cat "$LOG_PATH/${SUB_SERVICE_NAME}.log.new" > "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.last"
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.new"
+      fi
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: log management done" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      if [ -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock" ]; then
+        rm -f "$LOG_PATH/${SUB_SERVICE_NAME}.log.lock"
+      fi
+      echo "${SUB_SERVICE_NAME} started with pid $RUNNING_PID"
+    fi
+
+    return $RETVAL
+}
+
+stop () {
+
+    if [ $PROCESS_STALLED -eq 1 ]; then
+      echo "${SUB_SERVICE_NAME} is dead but pid file exists - $PID_PATH/${SUB_SERVICE_NAME}.pid"
+      return 1
+    fi
+
+    if [[ $RUNNING -eq 1 && $VALID_PIDFILE -eq 0 ]]; then
+      echo "error: A pid file exists for ${SUB_SERVICE_NAME} with no valid pid $PID_PATH/${SUB_SERVICE_NAME}.pid"
+      return 1
+    fi
+
+    if [ $RUNNING -eq 0 ]; then
+      echo "${SUB_SERVICE_NAME} is not running"
+      return 0
+    fi
+
+# Originally a stop call was made to the python daemon_runner which
+# initiated a new instance of the agent and the agent's main module, this often
+# resulted in the daemon_runner overwritting to the Skyline app log file due to
+# complexities in the python logging context relating to log handlers and the
+# use of multiprocessing.  These stop calls are no longer made directly to the
+# agent and they are made directly to the parent pid.  In terms of the
+# python-daemon this is exactly what initiating a new agent does, the
+# python-daemon simply issues a os.kill pid, however initiating a new instance
+# of the application results in a new daemon_runner that cannot preserve the
+# log file object of the running daemon_runner in terms of:
+# daemon_context.files_preserve = [handler.stream]
+# which results in the log file being overwritten.
+#    if [ $USE_VIRTUALENV -eq 0 ]; then
+#      /usr/bin/env python "$BASEDIR/skyline/${SERVICE_NAME}/agent.py" stop
+#    else
+#      $USE_PYTHON "$BASEDIR/skyline/${SERVICE_NAME}/agent.py" stop
+#    fi
+#    RETVAL=$?
+#    if [[ $RETVAL -eq 0 ]]; then
+#        echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SERVICE_NAME}.d :: stopped ${SERVICE_NAME}-agent"
+#    else
+#        echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SERVICE_NAME}.d :: error - failed to stop ${SERVICE_NAME}-agent"
+#    fi
+
+    SERVICE_PID=$RUNNING_PID
+    SERVICE_RELATED_PID=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | grep -c "$SERVICE_PID")
+    if [ $SERVICE_RELATED_PID -eq 1 ]; then
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: stopping process $SERVICE_PID" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+# @added 20200415 - Branch #3262: py3
+# Handle using a skyline user that does not have sudo access
+      $USE_SUDO kill $SERVICE_PID
+    fi
+
+    PROCESS_COUNT=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | wc -l)
+    if [ $PROCESS_COUNT -gt 0 ]; then
+      sleep 1
+    fi
+
+  # TODO: write a real kill script
+    PROCESS_COUNT=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | wc -l)
+    if [ $PROCESS_COUNT -gt 0 ]; then
+      # kill -15
+      ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | while read i_pid
+      do
+        SERVICE_RELATED_PID=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | grep -c "$i_pid")
+        if [ $SERVICE_RELATED_PID -eq 1 ]; then
+          echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: cleaning up process $i_pid" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+# @added 20200415 - Branch #3262: py3
+# Handle using a skyline user that does not have sudo access
+          $USE_SUDO kill $i_pid
+        fi
+      done
+
+      PROCESS_COUNT=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | wc -l)
+      if [ $PROCESS_COUNT -gt 0 ]; then
+        # kill -9
+        ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | while read i_pid
+        do
+          SERVICE_RELATED_PID=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | grep -c "$i_pid")
+          if [ $SERVICE_RELATED_PID -eq 1 ]; then
+            echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: kill -9 process $i_pid" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+# @added 20200415 - Branch #3262: py3
+# Handle using a skyline user that does not have sudo access
+            $USE_SUDO kill -9 $i_pid
+          fi
+        done
+      fi
+    fi
+
+    PROCESS_COUNT=$(ps aux | grep "${SERVICE_NAME}/snab_flux_load_test_agent.py start" | grep "$SUB_SERVICE_NAME" | grep -v grep | awk '{print $2 }' | wc -l)
+    if [[ ! -f "$PID_PATH/${SUB_SERVICE_NAME}.pid" && $PROCESS_COUNT -eq 0 ]]; then
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: all ${SUB_SERVICE_NAME} processes have been stopped - OK" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      echo "$SUB_SERVICE_NAME has been stopped"
+      RETVAL=0
+      return $RETVAL
+    fi
+    if [[ -f "$PID_PATH/${SUB_SERVICE_NAME}.pid" && $PROCESS_COUNT -eq 0 ]]; then
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: error - stopped all ${SUB_SERVICE_NAME} processes, but a pid file remains" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      rm -f "$PID_PATH/${SUB_SERVICE_NAME}.pid"
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: pid file removed" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      echo "$SUB_SERVICE_NAME has been stopped"
+      RETVAL=1
+    fi
+    if [[ -f "$PID_PATH/${SUB_SERVICE_NAME}.pid" && $PROCESS_COUNT -gt 0 ]]; then
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: error - failed to stop all ${SUB_SERVICE_NAME} processes and pid file remains" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      echo "$(date +"%Y-%m-%d %H:%M:%S") :: $PID :: ${SUB_SERVICE_NAME}.d :: error - there maybe zombies or multiple instances running" >> "$LOG_PATH/${SUB_SERVICE_NAME}.log"
+      echo "$SUB_SERVICE_NAME.d falied to stop all $SUB_SERVICE_NAME processes, there maybe zombies or multiple instances running"
+      RETVAL=1
+    fi
+
+    # These are reset for the restart context
+    RUNNING=0
+    VALID_PIDFILE=0
+    VALID_PID=0
+    PROCESS_STALLED=0
+
+    return $RETVAL
+}
+
+run () {
+    echo "running ${SUB_SERVICE_NAME}"
+    if [ $USE_VIRTUALENV -eq 0 ]; then
+      /usr/bin/env python "$BASEDIR/skyline/${SERVICE_NAME}/snab_flux_load_test_agent.py" run
+    else
+      $USE_PYTHON "$BASEDIR/skyline/${SERVICE_NAME}/snab_flux_load_test_agent.py" run
+    fi
+}
+
+# See how we were called.
+case "$1" in
+  start)
+    start
+        ;;
+  stop)
+    stop
+        ;;
+  restart)
+    RESTART=1
+    stop
+    start
+       ;;
+  run)
+    run
+      ;;
+  status)
+    status
+        ;;
+  *)
+        echo $"Usage: $0 {start|stop|run|status}"
+        exit 2
+        ;;
+esac