check RPC status

clear

# Function to center text in a given width (default 55)
center() {
  local str="$1"
  local width="${2:-55}"
  local len=${#str}
  local pad=$(( (width - len) / 2 ))
  printf "%*s%s%*s\n" $pad "" "$str" $pad ""
}

# Max label length for alignment
max_label_len=11

# Fetch Execution sync status
EXEC_RESPONSE=$(curl -s -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' http://localhost:8545)
syncing=$(echo "$EXEC_RESPONSE" | grep -o '"result":[^},]*' | cut -d: -f2 | tr -d '[:space:]')
if [[ "$syncing" == "false" ]]; then
  syncing_status="SYNCED  ✓"
  syncing_value="false"
else
  syncing_status="SYNCING ✗"
  syncing_value="true"
  current_block=$(echo "$EXEC_RESPONSE" | grep -o '"currentBlock":"[^"]*"' | cut -d: -f2 | tr -d '" ,')
  highest_block=$(echo "$EXEC_RESPONSE" | grep -o '"highestBlock":"[^"]*"' | cut -d: -f2 | tr -d '" ,')
fi

# Fetch Execution block number
BLOCK_NUM_RESPONSE=$(curl -s -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' http://localhost:8545)
block_number_hex=$(echo "$BLOCK_NUM_RESPONSE" | grep -o '"result":"[^"]*"' | cut -d: -f2 | tr -d '" ,')
block_number_int=$((16#${block_number_hex#0x}))

# Output Execution block
echo "───────────────────────────────────────────────────────"
center "Execution Client - Sepolia (Port 8545)"
echo "───────────────────────────────────────────────────────"
echo "● Status: $syncing_status"
printf "    %-${max_label_len}s : %s\n" "Syncing" "$syncing_value"
if [[ "$syncing_value" == "true" ]]; then
  printf "    %-${max_label_len}s : %s\n" "CurrentBlock" "$current_block"
  printf "    %-${max_label_len}s : %s\n" "HighestBlock" "$highest_block"
fi
printf "    %-${max_label_len}s : %d\n" "Block" "$block_number_int"
echo "───────────────────────────────────────────────────────"

# Add 3 blank lines
for i in {1..3}; do echo; done

# Fetch Prysm status
PRYSM_RESPONSE=$(curl -s http://localhost:3500/eth/v1/node/syncing 2>/dev/null)
if [[ -z "$PRYSM_RESPONSE" ]]; then
  PRYSM_ERROR="Consensus endpoint unreachable"
else
  is_syncing=$(echo "$PRYSM_RESPONSE" | grep -o '"is_syncing":[^,}]*' | cut -d: -f2 | tr -d '[:space:]')
  is_syncing=${is_syncing:-null}
  is_optimistic=$(echo "$PRYSM_RESPONSE" | grep -o '"is_optimistic":[^,}]*' | cut -d: -f2 | tr -d '[:space:]')
  is_optimistic=${is_optimistic:-null}
  el_offline=$(echo "$PRYSM_RESPONSE" | grep -o '"el_offline":[^,}]*' | cut -d: -f2 | tr -d '[:space:]')
  el_offline=${el_offline:-null}
  if [[ "$is_syncing" == "true" ]]; then
    consensus_status="SYNCING ✗"
  else
    consensus_status="SYNCED  ✓"
  fi
fi

# Output Prysm block
echo "───────────────────────────────────────────────────────"
center "Consensus Client - Beacon (Port 3500)"
echo "───────────────────────────────────────────────────────"
if [[ -n "$PRYSM_ERROR" ]]; then
  echo "● Error: $PRYSM_ERROR"
else
  echo "● Status: $consensus_status"
  printf "    %-${max_label_len}s : %s\n" "Syncing" "$is_syncing"
  printf "    %-${max_label_len}s : %s\n" "Optimistic" "$is_optimistic"
  printf "    %-${max_label_len}s : %s\n" "EL Offline" "$el_offline"
fi
echo "───────────────────────────────────────────────────────"