india-isin-data/fetch.sh

#!/bin/bash

export PUP_BINARY="$(which pup)"

if ! command -v pup &> /dev/null
then
  wget https://github.com/ericchiang/pup/releases/download/v0.4.0/pup_v0.4.0_linux_amd64.zip -O pup.zip
  echo "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  pup.zip" | sha256sum --check 
  unzip pup.zip
  rm pup.zip
  chmod +x ./pup
  export PUP_BINARY="$(pwd)/pup"
fi

# Call with INX Page_num file_name
function fetch_page() {
  echo "[+] $1/$2"
  curl "https://nsdl.co.in/master_search_res.php" \
    --user-agent "Mozilla/Gecko/Firefox/58.0" \
    --silent \
    --retry 3 \
    --connect-timeout 10 \
    --retry-max-time 30 \
    --data cnum=$1 \
    --data "page_no=$2" | $PUP_BINARY '#nsdl-tables tr json{}' | \
  # generate 6 lines (second column has a link, so parse that) with raw output
  jq --raw-output '.[] | [.children[1].children[0].text, .children[2].text, .children[3].text,.children[4].text,.children[5].text]|.[]' | \
  # and create a CSV from every 5 lines
  paste -d, - - - - -  | \
  # and we don't need the first row
  tail -n +2 >> "$3"
}
function fetch_total_pages() {
  curl "https://nsdl.co.in/master_search_res.php" \
    --user-agent "Mozilla/Gecko/Firefox/58.0" \
    --silent \
    --data cnum=$1 \
    --data "page_no=1" |
  $PUP_BINARY 'input[name=total_page] attr{value}'
}
export -f fetch_page

function fetch_class() {
  for i in $(seq 1 $2); do
    sem -j 10 --timeout 500% fetch_page $1 $i "$1.csv"
  done
}

for i in E F 9; do
  total=$(fetch_total_pages "IN$i")
  echo "::group::IN$i (Total=$total)"
  rm "IN$i.csv"
  fetch_class "IN$i" $total
  echo "::endgroup::"
  # Sort the file in place
  sort -o "IN$i.csv" "IN$i.csv"
done

sem --wait