From b491fdc8b9d8367ee7d0b6f31bed66d38f932b06 Mon Sep 17 00:00:00 2001
From: Kristijan Mitrovic <kmitrovic@itekako.com>
Date: Tue, 28 Jul 2020 16:06:01 +0200
Subject: [PATCH] Use links to /dev/null when logs are turned off

---
 .../packer/roles/bubble/files/log_manager.sh  | 80 +++----------------
 1 file changed, 13 insertions(+), 67 deletions(-)

diff --git a/bubble-server/src/main/resources/packer/roles/bubble/files/log_manager.sh b/bubble-server/src/main/resources/packer/roles/bubble/files/log_manager.sh
index b3c21f0f..a7926231 100755
--- a/bubble-server/src/main/resources/packer/roles/bubble/files/log_manager.sh
+++ b/bubble-server/src/main/resources/packer/roles/bubble/files/log_manager.sh
@@ -4,77 +4,23 @@
 # https://getbubblenow.com/bubble-license/
 #
 
-function die {
-  echo 1>&2 "${1}"
-  exit 1
-}
-
 BUBBLE_LOGS_FOLDER=/var/log/bubble
 REDIS_LOG_FLAG_KEY="bubble.StandardSelfNodeService.bubble_server_logs_enabled"
 
-SUPERVISOR_CONFIG_DIR=/etc/supervisor/conf.d
-if [[ ! -d "${SUPERVISOR_CONFIG_DIR}" ]]; then
-  die "Cannot find folder with supervisor configuration files"
-fi
-
-# use bubble configuration as reference for current (previous) log flag state:
-SUPERVISOR_BUBBLE_CONFIG=${SUPERVISOR_CONFIG_DIR}/bubble.conf
-if [[ ! -f "${SUPERVISOR_BUBBLE_CONFIG}" ]]; then
-  die "Cannot find file with supervisor configuration for bubble process"
-fi
-
-BUBBLE_ERR_LOG=$(awk -F "=" '/stderr_logfile/ {print $2}' ${SUPERVISOR_BUBBLE_CONFIG} | xargs echo)
-SUPERVISOR_LOG_FLAG=$([[ ${BUBBLE_ERR_LOG} != NONE* ]] && echo true || echo false)
-
 REDIS_LOG_FLAG_VALUE=$(echo "get ${REDIS_LOG_FLAG_KEY}" | redis-cli | xargs echo | tr '[:upper:]' '[:lower:]')
-REDIS_LOG_FLAG=$([[ ${REDIS_LOG_FLAG_VALUE} == true ]] && echo true || echo false)
-
 
-function setLoggingForSupervisorConfig {
-  cfgFile="${1}"
-  logFlag="${2}"
-  tmpFile="$(mktemp /tmp/bubble.log_manager.XXXXXX)"
-
-  while IFS= read -r line; do
-    if [[ ${line} == std???_logfile* ]]; then
-      if [[ "${logFlag}" == "true" ]]; then
-        # the line should be `std???_logfile = NONE # <original value>` so just remove `NONE #`
-        echo "${line/_logfile = NONE # /_logfile = }" >> "${tmpFile}"
-      else
-        # truncate current log files:
-        logFile=$(echo "${line}" | awk -F "=" '{print $2}' | xargs echo)
-        # note that current log file will be truncated afterwards at the very end of this shell script together with
-        # other logs from this same folder (the log should be in ${BUBBLE_LOGS_FOLDER}).
-        # remove old logs if any:
-        rm "${logFile}.*"
-        # finally, set NONE got log output in supervisor config file's line:
-        if [[ ${line} != *"_logfile = NONE # "* ]]; then
-          # avoid adding multiple NONE in the line just in case with above test
-          echo "${line/_logfile = /_logfile = NONE # }" >> "${tmpFile}"
-        else
-          echo "${line}" >> "${tmpFile}"
-        fi
-      fi
-    else
-      echo "${line}" >> "${tmpFile}"
-    fi
-  done < "${cfgFile}"
-  cat "${tmpFile}" > "${cfgFile}"
-
-  rm "${tmpFile}"
-}
-
-
-if [[ "${SUPERVISOR_LOG_FLAG}" != "${REDIS_LOG_FLAG}" ]]; then
-  # change log setup on supervisor configs to match value from redis
-  for cfgFile in "${SUPERVISOR_CONFIG_DIR}"/* ; do
-    setLoggingForSupervisorConfig "${cfgFile}" "${REDIS_LOG_FLAG}"
+if [[ ${REDIS_LOG_FLAG_VALUE} == true ]]; then
+  is_reload_needed=false
+  for logFile in $(find "${BUBBLE_LOGS_FOLDER}"/* -type l); do
+    rm "${logFile}"
+    touch "${logFile}"
+    is_reload_needed=true
+  done
+  if [[ ${is_reload_needed} == true ]]; then
+    supervisorctl reload
+  fi
+else
+  for logFile in $(find "${BUBBLE_LOGS_FOLDER}"/* -type f); do
+    ln -sf /dev/null "${logFile}"
   done
-  supervisorctl reread
-  supervisorctl reload
-fi
-
-if [[ "${REDIS_LOG_FLAG}" != "true" ]]; then
-  # truncate tmp bubble log files each time as those might have some output in between:
-  ls ${BUBBLE_LOGS_FOLDER}/* | xargs truncate -c -s0
 fi