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feat: storage-diff.sh (#1054)
* feat: storage-diff.sh * refactor: storage-diff.sh * refactor: storage-diff.sh * refactor: storage-diff.sh * refactor: storage-diff.sh * refactor: storage-diff.sh
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‎bin/storage-diff.sh‎

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#!/bin/bash
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# Default values
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RPC_URL="https://eth.llamarpc.com"
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ETHERSCAN_API_KEY="1234567890123456789012345678901234567890"
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INPUT_FILE="contracts.json"
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QUIET=false
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TOTAL_ISSUES=0
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# Help message
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usage() {
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cat << EOF
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Usage: bash $0 --rpc-url $RPC_URL --etherscan-key $ETHERSCAN_API_KEY --input $INPUT_FILE [--quiet] [--help]
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Detects storage layout incompatibilities that could cause issues during upgrades.
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Required:
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-r, --rpc-url <url> RPC endpoint URL for the target network (default: https://eth.llamarpc.com).
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-e, --etherscan-key <key> API key for Etherscan to fetch contract data.
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Options:
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-i, --input <file> JSON file containing contract details, see format below (default: contracts.json).
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If not provided, reads from stdin.
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-q, --quiet Suppress informational output.
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-h, --help Show this help message.
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Input JSON format:
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{
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"contracts": [
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{
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"name": "AVSDirectory",
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"address": "0x135dda560e946695d6f155dacafc6f1f25c1f5af"
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},
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{
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"name": "DelegationManager",
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"address": "0x39053D51B77DC0d36036Fc1fCc8Cb819df8Ef37A"
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}
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]
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}
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EOF
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exit 1
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}
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# Process command line arguments using a while loop and case statement.
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while [[ $# -gt 0 ]]; do
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case $1 in
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-r|--rpc-url)
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RPC_URL="$2"
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shift 2
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;;
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-e|--etherscan-key)
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ETHERSCAN_API_KEY="$2"
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shift 2
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;;
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-i|--input)
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INPUT_FILE="$2"
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shift 2
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;;
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-q|--quiet)
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QUIET=true
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shift
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;;
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-h|--help)
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usage
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;;
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*)
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echo "Unknown option: $1"
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usage
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;;
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esac
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done
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# Validate required arguments
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if [ -z "$RPC_URL" ] || [ -z "$ETHERSCAN_API_KEY" ]; then
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echo "Error: RPC URL and Etherscan API key are required"
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usage
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fi
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# Read JSON input
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if [ -n "$INPUT_FILE" ]; then
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if [ ! -f "$INPUT_FILE" ]; then
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echo "Error: Input file not found: $INPUT_FILE"
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exit 1
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fi
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json_input=$(cat "$INPUT_FILE")
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else
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json_input=$(cat)
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fi
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# Parse JSON values using jq
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CONTRACTS=$(echo "$json_input" | jq -c '.contracts[]')
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# Verify contracts are specified
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if [ -z "$CONTRACTS" ]; then
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echo "Error: No contracts specified in JSON input"
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exit 1
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fi
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# Function to calculate number of slots a variable type occupies
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calculate_slots() {
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local var_type=$1
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# Handle basic types
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case $var_type in
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*"uint256"*|*"int256"*|*"bytes32"*|*"address"*)
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echo 1
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;;
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*"mapping"*)
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echo 1 # Mappings use 1 slot for the starting position
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;;
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*"bytes"*|*"string"*)
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echo 1 # Dynamic types use 1 slot for length/pointer
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;;
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*"array"*)
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echo 1 # Arrays use 1 slot for length/pointer, need to figure out how to parse slots consumed.
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;;
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*)
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# Default to 1 slot if unknown
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echo 1
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;;
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esac
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}
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# Function to analyze storage changes
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analyze_storage_changes() {
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local onchain_file=$1
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local local_file=$2
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local contract_name=$3
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local issues_found=0
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# Get the storage layouts as arrays
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local onchain_slots=$(jq -r '.storage[] | "\(.slot)|\(.label)|\(.offset)|\(.type)"' "$onchain_file")
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local local_slots=$(jq -r '.storage[] | "\(.slot)|\(.label)|\(.offset)|\(.type)"' "$local_file")
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echo "Storage Layout Analysis for $contract_name:"
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echo "----------------------------------------"
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# Create temporary files for our data structures
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local onchain_map_file=$(mktemp)
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local local_map_file=$(mktemp)
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local processed_slots_file=$(mktemp)
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local renamed_vars_file=$(mktemp)
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# Parse onchain slots
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echo "$onchain_slots" | while IFS='|' read -r slot label offset type; do
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if [[ -n "$slot" ]]; then
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echo "${slot}|${label}|${offset}|${type}" >> "$onchain_map_file"
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fi
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done
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# Parse local slots
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echo "$local_slots" | while IFS='|' read -r slot label offset type; do
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if [[ -n "$slot" ]]; then
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echo "${slot}|${label}|${offset}|${type}" >> "$local_map_file"
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fi
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done
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# First pass: Check for renames (same slot, same type, different name)
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while IFS='|' read -r slot local_label local_offset local_type; do
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if [[ -z "$slot" ]]; then continue; fi
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# Look for matching slot in onchain
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onchain_line=$(grep "^${slot}|" "$onchain_map_file")
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if [[ -n "$onchain_line" ]]; then
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IFS='|' read -r _ onchain_label onchain_offset onchain_type <<< "$onchain_line"
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if [[ "$local_label" != "$onchain_label" && "$local_type" == "$onchain_type" && "$local_offset" == "$onchain_offset" ]]; then
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echo "${slot}|${onchain_label}|${local_label}|${local_type}" >> "$renamed_vars_file"
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echo "$slot" >> "$processed_slots_file"
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issues_found=$((issues_found + 1))
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fi
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fi
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done < "$local_map_file"
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# Print renames first
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while IFS='|' read -r slot old_name new_name type; do
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if [[ -n "$slot" ]]; then
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echo -e "\033[36m📝 Variable renamed at slot $slot:\033[0m"
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echo -e "\033[36m $old_name -> $new_name ($type)\033[0m"
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fi
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done < "$renamed_vars_file"
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# Analyze other differences
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while IFS='|' read -r slot local_label local_offset local_type; do
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if [[ -z "$slot" ]]; then continue; fi
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# Skip if this slot was processed as a rename
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if grep -q "^${slot}$" "$processed_slots_file"; then
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continue
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fi
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# Look for matching slot in onchain
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onchain_line=$(grep "^${slot}|" "$onchain_map_file")
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if [[ -z "$onchain_line" ]]; then
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# New variable added
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slots_needed=$(calculate_slots "$local_type")
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echo -e "\033[32m✨ New variable added: $local_label ($local_type) at slot $slot\033[0m"
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issues_found=$((issues_found + 1))
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if [ "$slots_needed" -gt 1 ]; then
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echo -e "\033[33m 📦 This variable occupies $slots_needed slots\033[0m"
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fi
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else
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IFS='|' read -r _ onchain_label onchain_offset onchain_type <<< "$onchain_line"
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if [[ "$local_label" != "$onchain_label" ]]; then
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echo -e "\033[31m🚨 Storage slot override detected at slot $slot:\033[0m"
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echo -e "\033[31m Previous: $onchain_label ($onchain_type)\033[0m"
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echo -e "\033[32m New: $local_label ($local_type)\033[0m"
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issues_found=$((issues_found + 1))
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# Calculate potential impact
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old_slots=$(calculate_slots "$onchain_type")
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new_slots=$(calculate_slots "$local_type")
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slot_diff=$((new_slots - old_slots))
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if [ "$slot_diff" -gt 0 ]; then
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echo -e "\033[33m ⚠️ This change will shift subsequent storage slots by +$slot_diff positions\033[0m"
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elif [ "$slot_diff" -lt 0 ]; then
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echo -e "\033[33m 💡 This change will reduce storage usage by $((slot_diff * -1)) slots\033[0m"
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fi
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elif [[ "$local_type" != "$onchain_type" ]]; then
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echo -e "\033[33m🔄 Type change detected for $local_label at slot $slot:\033[0m"
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echo -e "\033[31m Previous: $onchain_type\033[0m"
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echo -e "\033[32m New: $local_type\033[0m"
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issues_found=$((issues_found + 1))
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fi
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fi
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echo "$slot" >> "$processed_slots_file"
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done < "$local_map_file"
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# Check for removed variables
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while IFS='|' read -r slot onchain_label onchain_offset onchain_type; do
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if [[ -z "$slot" ]]; then continue; fi
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# Skip if this slot was processed as a rename or already handled
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if grep -q "^${slot}$" "$processed_slots_file"; then
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continue
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fi
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# Look for matching slot in local
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if ! grep -q "^${slot}|" "$local_map_file"; then
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echo -e "\033[31m➖ Variable removed: $onchain_label ($onchain_type) from slot $slot\033[0m"
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issues_found=$((issues_found + 1))
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fi
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done < "$onchain_map_file"
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# Cleanup temporary files
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rm -f "$onchain_map_file" "$local_map_file" "$processed_slots_file" "$renamed_vars_file"
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echo "Issues found in $contract_name: $issues_found"
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return $issues_found
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}
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# Function to process a single contract
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process_contract() {
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local contract_name=$1
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local contract_address=$2
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local issues_found=0
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# Create directories for storing layouts and diffs
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mkdir -p "storage-report/layouts" "storage-report/diffs"
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local local_file="storage-report/layouts/${contract_name}_local.json"
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local onchain_file="storage-report/layouts/${contract_name}_onchain.json"
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local diff_file="storage-report/diffs/${contract_name}.diff"
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# Generate storage layouts
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if ! forge inspect "$contract_name" storage --json > "$local_file" 2>/dev/null; then
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echo "Error: forge inspect failed for contract: $contract_name"
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return 1
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fi
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if ! cast storage "$contract_address" --rpc-url "$RPC_URL" --etherscan-api-key "$ETHERSCAN_API_KEY" --json > "$onchain_file" 2>/dev/null; then
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echo "Error: cast storage failed for address: $contract_address"
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return 1
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fi
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# Delete the first line of $onchain_file
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sed '1d' "$onchain_file" > "$onchain_file.tmp" && mv "$onchain_file.tmp" "$onchain_file"
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# Filter out astId and contract fields from local and onchain files, and normalize type identifiers
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jq 'del(.types, .values, .storage[].astId, .storage[].contract) | .storage[].type |= gsub("\\([^)]+\\)[0-9]+"; "")' "$local_file" > "${local_file}.tmp" && mv "${local_file}.tmp" "$local_file"
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jq 'del(.types, .values, .storage[].astId, .storage[].contract) | .storage[].type |= gsub("\\([^)]+\\)[0-9]+"; "")' "$onchain_file" > "${onchain_file}.tmp" && mv "${onchain_file}.tmp" "$onchain_file"
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if [ "$QUIET" = false ]; then
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echo "----------------------------------------"
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echo "Local contract: $contract_name"
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echo "Chain address: $contract_address"
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echo "Network RPC: $RPC_URL"
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echo "JSON files stored in: storage-report/layouts/"
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echo "Diffs stored in: storage-report/diffs/"
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echo "----------------------------------------"
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fi
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# Generate and store diff
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diff -u "$onchain_file" "$local_file" > "$diff_file" 2>/dev/null || true
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# Analyze storage changes
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analyze_storage_changes "$onchain_file" "$local_file" "$contract_name"
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issues_found=$?
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return $issues_found
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}
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# Process each contract from the JSON input
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while IFS= read -r contract; do
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contract_name=$(echo "$contract" | jq -r '.name')
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contract_address=$(echo "$contract" | jq -r '.address')
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if [ -z "$contract_name" ] || [ -z "$contract_address" ]; then
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echo "Error: Each contract must specify both name and address"
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continue
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fi
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if [ "$QUIET" = false ]; then
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echo "Processing contract: $contract_name at $contract_address"
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fi
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process_contract "$contract_name" "$contract_address"
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TOTAL_ISSUES=$((TOTAL_ISSUES + $?))
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done <<< "$CONTRACTS"
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if [ "$TOTAL_ISSUES" -gt 0 ]; then
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echo -e "\n\033[31m🚨 Total storage layout issues found: $TOTAL_ISSUES\033[0m"
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exit 1
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else
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echo -e "\n\033[32m✅ No storage layout issues found\033[0m"
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exit 0
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fi

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