Log parser app

Develop the command line node.js application, which parses the input log file. 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.

Requirements:

• TypeScript project.
• Designed in accordance with OOD principles (DRY, SLAP, SOLID, etc).
• Unit-testing ready (or partially covered by tests)
• Flexibility of the architecture. Application should be easy to extend and modify.

Usage:

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

Input

Format: - - {"transactionId: "", "details": "<message event/action description>", "err": "<Optionall, error description>", ...}

Example

2021-08-09T02:12:51.253Z - info - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","details":"Service is started"} 2021-08-09T02:12:51.254Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","details":"About to request the user information","userId": 10} 2021-08-09T02:12:51.254Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","details":"About to request user orders list","userId": 10} 2021-08-09T02:12:51.255Z - info - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e821","details":"Service is started"} 2021-08-09T02:12:51.257Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e821","details":"About to request the user information","userId": 16} 2021-08-09T02:12:51.257Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","details":"User information is gathered","user":{"id":10,"name":"Alice"}} 2021-08-09T02:12:51.258Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e821","details":"About to request user orders list","userId":16} 2021-08-09T02:12:51.259Z - error - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","details":"Cannot find user orders list","code": 404,"err":"Not found"} 2021-08-09T02:12:51.259Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e821","details":"User information is retrieved","user": {"id": 16, "name": "Michael"}} 2021-08-09T02:12:51.262Z - debug - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e821","details":"User information is retrieved","user":{"id":16,"orders":[{"id":472,"items":{"id":7,"price":7.12}}]}} 2021-08-09T02:12:51.264Z - warn - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","details":"Service finished with error","code":404,"err":"Cannot find user orders list"} 2021-08-09T02:12:51.265Z - info - {"transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e821","details":"Service is successfully finished"}

Output

Format: [{"timestamp": , "loglevel": "", "transactionId: "", "err": "" }]

Example

[{"timestamp":1628475171259,"loglevel":"error","transactionId":"9abc55b2-807b-4361-9dbe-aa88b1b2e978","err":"Not found"}]

Setup

Requirements using Docker

• Docker (https://docs.docker.com/engine/install/)
• Docker compose (https://docs.docker.com/compose/install/)

Requirements without Docker

• NodeJS 14 or higher (https://nodejs.org/en/)
• NPM (Installed by NodeJS) or Yarn (https://classic.yarnpkg.com/en/docs/install)

Installing with Docker

git clone git@github.com:adamaraujodelima/log-parser-app.git
cd log-parser-app && docker-compose up -d
docker exec logparserapp sh -c "cd /app && yarn && yarn tsc"

Installing without docker

git clone git@github.com:adamaraujodelima/log-parser-app.git
cd log-parser-app && yarn && yarn tsc

Usage

Runing with docker

Running tests

docker exec logparserapp sh -c "cd /app && yarn test" 

Running parser

docker exec logparserapp sh -c "cd /app && node dist/parser.js --input {directory_of_file} --output {directory_with_name_fle}"

Runing without Docker

Running tests

yarn test 

Running parser

node dist/parser.js --input {directory_of_file} --output {directory_with_name_fle}