Log Parser Tool

Flow

The application should find all the log messages with the level error and print them into the output file. Formats of input and outfit files are described below.

get log file location by parsing input flag (process argv)
get output file location by parsing input flag (process argv)
reads the log file line by line as ReadStream,
Parse and convert to Log object.
Publish selected log level(s) with observers. (Log level is dynamically changeable by updating filter.)
Json Exporter which is one of observer of Log Reader will export logs in JSON format as WriteStream.

Input Format

<ISO Date> - <Log Level> - {"transactionId: "<UUID>", "details": "<message event/action description>", "err": "<Optionall, error description>", ...<additional log information>}

Output Format

[{"timestamp": <Epoch Unix Timestamp>, "loglevel": "<loglevel>", "transactionId: "<UUID>", "err": "<Error message>" }]

Configuration

Before start program you have to add flags to script that is for running the application

Flag	Example	Description
`--input`	./app.log	log file that will be parsed
`--output`	./errors.json	json file that is created after process

Setup

install all dependencies via npm

npm install

Build Script

build the app

npm run build

Run Script

after installation ready to run program.

node dist/src/parser.js --input ./app.log --output ./errors.json

EryegitS / log-parser