Parsing log strings in Bark

Bark contains a client library which can be imported in a Golang project. Now, logs in bark are actually structured. They have a Level, a LMID and the actual message. So we wrote a parser which tries parse the log message and if it fits the formats, it would set the level and LMID along with the Log message.

The Format and Behaviour

The general format of the Log message which the parser understands (and expects) is like this:

<LVL_CHAR>#<LMID> - <LOG_MESSAGE>

These fields are:

1. LVL_CHAR: is a single character indicating the log severity level. The accepted characters are basically the first character of their names:
   • P: Panic
   • A: Alert
   • E: Error
   • W: Warning
   • N: Notice
   • I: Info
   • D: Debug
2. LMID: Is the Log Message Identifier. It is separated on the left from LVL_CHAR by a # and on the right from the LOG_MESSAGE by a -. The spaces around - are optional but recommended to be left as it is.
3. LOG_MESSAGE: This is the actual Log Message which the user wants to save.

It is worth noting that:

• If the LVL_CHAR is set to anything else, it will automatically be set to the default log level set by the user when creating the client.
• <LVL_CHAR># (the LVL_CHAR along with #) is optional. When it is missing, the default log level will be used instead.

It is best to demonstrate the behavior with examples.

Examples

Here is how it behaves with various inputs:

Input string	Level	Log Message ID	Log message
D#LMID1 - Log message	DEBUG	LMID1	Log message
I#LMID2 - Log message2	INFO	LMID2	Log message2
N#LMID3 - Log message3	NOTICE	LMID3	Log message3
W#LMID4 - Log message4	WARN	LMID4	Log message4
E#LMID5 - Log message5	ERROR	LMID5	Log message5
A#LMID6 - Log message6	ALERT	LMID6	Log message6
P#LMID7 - Log message7	ERROR	LMID7	Log message7
LMID2 - Log message8	INFO	LMID2	Log message8
Log message9	INFO	000000	Log message9
- Log message10	INFO	000000	- Log message10
# - Log message11	INFO	000000	# - Log message11
X# - Log message12	INFO	000000	X# - Log message12
XX# - Log message13	INFO	000000	XX# - Log message13
XX#LMID14 - Log message14	INFO	000000	XX#LMID14 - Log message14
XX#LMIDINTHISCASEISVERYVERYLONG - Log message15	INFO	000000	XX#LMIDINTHISCASEISVERYVERYLONG - Log message15
#LMIDINTHISCASEISVERYVERYLONG - Log message16	INFO	000000	#LMIDINTHISCASEISVERYVERYLONG - Log message16
#LMID17 - Log message17	INFO	000000	#LMID17 - Log message17
D#LMID18 - Log message18	DEBUG	LMID18	Log message18
D # LMID19 - Log message19	DEBUG	LMID19	Log message19
(blank string)	INFO	000000	(blank string)
(whitespace)	INFO	000000	(blank string)