feature(logger): Add plain-text logger function

logger.sh

@@ -4,38 +4,47 @@ getTimeStamp() {
   (date -u +"%Y-%m-%dT%H:%M:%SZ")
 }
 
+getHostname() {
+  (hostname -s)
+}
+
 uppercase() {
   echo "$1" | tr '[:lower:] [:upper:]'
 }
 
+# modified syslog fmt: <ISO-8601 timestamp> <hostname> <tag>[pid]: [LEVEL:$2] [STATUS:$3] <MESSAGE:$1> (<OPERATION:$4>:<CODE:$5>)
+writePlainTextLog() {
+  # if no message is supplied, there is no purpose in generating a log message!
+  if [ -z "$1" ]; then
+    return
+  fi
+
+  printf "%s %s %s[%s]: [%s] [%s] %s (%s:%s)\n" \
+    "$(getTimeStamp)" "$(getHostname)" "$LOG_PROGRAM_NAME" "$$" \
+    "$2" "$3" "$1" "${4:UNSPECIFIED}" "${5:999}"
+}
+
 # $1: message, $2: level, $3: status, $4: operation, $5: code
 writeJsonLog() {
-  PROGRAM_NAME="cfddns"
-  DEFAULT_CODE=99
-  DEFAULT_LEVEL="info"
-  DEFAULT_MESSAGE="An unspecified error has occurred"
-  DEFAULT_OPERATION="unspecified"
-  DEFAULT_STATUS="ERR"
-
   if [ -z "$1" ]; then
     PROPS="$(
       jq --null-input \
         --arg level "err" \
-        --arg pName "$PROGRAM_NAME" \
-        --arg operation "$DEFAULT_OPERATION" \
-        --arg status "$DEFAULT_STATUS" \
-        --arg code "$DEFAULT_CODE" \
-        --arg message "$DEFAULT_MESSAGE" \
+        --arg pName "$LOG_PROGRAM_NAME" \
+        --arg operation "$LOG_DEFAULT_OPERATION" \
+        --arg status "$LOG_DEFAULT_STATUS" \
+        --arg code "$LOG_DEFAULT_CODE" \
+        --arg message "$LOG_DEFAULT_MESSAGE" \
         '{"level":$level, "programName":$pName, "status":$status, "operation":$operation, "code":$code, "message":$message}' \
     )"
   else
     PROPS="$(
       jq --null-input \
-        --arg level "${2:-$DEFAULT_LEVEL}" \
-        --arg pName "$PROGRAM_NAME" \
-        --arg status "$(uppercase "${3:-$DEFAULT_STATUS}")" \
-        --arg operation "${4:-$DEFAULT_OPERATION}" \
-        --arg code "${5:-$DEFAULT_CODE}" \
+        --arg level "${2:-$LOG_DEFAULT_LEVEL}" \
+        --arg pName "$LOG_PROGRAM_NAME" \
+        --arg status "$(uppercase "${3:-$LOG_DEFAULT_STATUS}")" \
+        --arg operation "${4:-$LOG_DEFAULT_OPERATION}" \
+        --arg code "${5:-$LOG_DEFAULT_CODE}" \
         --arg message "$1" \
         '{"level":$level, "programName":$pName, "status":$status, "operation":$operation, "code":$code, "message":$message}' \
     )"
@@ -47,13 +56,6 @@ writeJsonLog() {
 
 # $1: message, $2: level, $3: status, $4: operation, $5: code
 writeJournalLog() {
-  PROGRAM_NAME="cfddns"
-  DEFAULT_CODE=99
-  DEFAULT_LEVEL="info"
-  DEFAULT_MESSAGE="An unspecified error has occurred"
-  DEFAULT_OPERATION="unspecified"
-  DEFAULT_STATUS="ERR"
-
   # translate error levels
   if [ -z "$2" ]; then
     LOG_LEVEL=1
@@ -92,30 +94,37 @@ writeJournalLog() {
 MESSAGE_ID="$(systemd-id128 new)"
 SYSLOG_TIMESTAMP="$(getTimeStamp)"
 SYSLOG_FACILITY=3
-SYSLOG_IDENTIFIER="${PROGRAM_NAME}"
+SYSLOG_IDENTIFIER="${LOG_PROGRAM_NAME}"
 PRIORITY=4
-ERRNO="${DEFAULT_CODE}"
-OPERATION="${DEFAULT_OPERATION}"
-MESSAGE="${DEFAULT_MESSAGE}"
-STATUS="${DEFAULT_STATUS}"
+ERRNO="${LOG_DEFAULT_CODE}"
+OPERATION="${LOG_DEFAULT_OPERATION}"
+MESSAGE="${LOG_DEFAULT_MESSAGE}"
+STATUS="${LOG_DEFAULT_STATUS}"
 end
   else
     logger --journald <<end
 MESSAGE_ID="$(systemd-id128 new)"
 SYSLOG_TIMESTAMP="$(getTimeStamp)"
 SYSLOG_FACILITY=3
-SYSLOG_IDENTIFIER="${PROGRAM_NAME}"
+SYSLOG_IDENTIFIER="${LOG_PROGRAM_NAME}"
 PRIORITY="${LOG_LEVEL}"
-ERRNO="${5:-$DEFAULT_CODE}"
-OPERATION="${4:-$DEFAULT_OPERATION}"
+ERRNO="${5:-$LOG_DEFAULT_CODE}"
+OPERATION="${4:-$LOG_DEFAULT_OPERATION}"
 MESSAGE="$1"
-STATUS="${3:-$DEFAULT_STATUS}"
+STATUS="${3:-$LOG_DEFAULT_STATUS}"
 end
   fi
 
   return
 }
 
+LOG_PROGRAM_NAME="cfddns"
+LOG_DEFAULT_CODE=99
+LOG_DEFAULT_LEVEL="info"
+LOG_DEFAULT_MESSAGE="An unspecified error has occurred"
+LOG_DEFAULT_OPERATION="unspecified"
+LOG_DEFAULT_STATUS="ERR"
+
 if [ "$1" = "json" ]; then
   writeJsonLog # this will generate a generic error message
   writeJsonLog "This is a test message" # generate this message at the default level with the default code