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Granting privileges in Postgres

Steps

Below are some common ways to grant access to a PostgreSQL user:

1. Grant CONNECT to the database:

GRANT CONNECT ON DATABASE database_name TO username;

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Grouping results and removing unwanted ones

Here we want to scrape product name, price and rating from ebay product pages:

url = 'https://www.ebay.com/itm/Sony-PlayStation-4-PS4-Pro-1TB-4K-Console-Black/203084236670' 

wanted_list = ['Sony PlayStation 4 PS4 Pro 1TB 4K Console - Black', 'US $349.99', '4.8'] 

scraper.build(url, wanted_list)

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FastAPI and Uvicorn Logging

When running FastAPI app, all the logs in console are from Uvicorn and they do not have timestamp and other useful information. As Uvicorn applies python logging module, we can override Uvicorn logging formatter by applying a new logging configuration.

Meanwhile, it's able to unify the your endpoints logging with the Uvicorn logging by configuring all of them in the config file log_conf.yaml.

Before overriding:

uvicorn main:app --reload

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How to Install Let's Encrypt SSL on Ubuntu with Certbot

Install snapd

The apt version of certbot is usually not up-to-date, so it's preferable to install it with snap.

sudo systemctl status snapd

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Docker Scout CLI notes

1. Analyze local files

• Get an at-a-glance vulnerability summary of the source code in the current working directory

  docker scout quickview fs://.
  

• View the details of vulnerabilities found in your local source code

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Find dependent objects for a table or view in Postgresql or Redshift

SELECT dependent_ns.nspname as dependent_schema
, dependent_view.relname as dependent_view 
, source_ns.nspname as source_schema
, source_table.relname as source_table
, pg_attribute.attname as column_name
FROM pg_depend 
JOIN pg_rewrite ON pg_depend.objid = pg_rewrite.oid 

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RabbitMQ Tips

Installation

Mac

brew update
brew install rabbitmq

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import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;

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How to create a read-only PostgreSQL user

1. Create a new user in PostgreSQL

   CREATE USER <username> WITH PASSWORD '<password>';
   

2. GRANT CONNECT access

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How to resolve git error: Unable to append to .git/logs/refs/remotes/origin/master: Permission denied

It appears git was run locally as root, thus changing the ownership on some of the files tracking the location of the origin branch.

Fixing the file ownership should resolve the issue:

# run this from the root of the git working tree
sudo chown -R "${USER:-$(id -un)}" .