# Foundry / cast 工具链

## 必须用 foundry-zksync

不是标准 foundry！需要 `--zksync` flag 才能编译 zkSync system contract。

```bash
# 安装
curl -L https://raw.githubusercontent.com/matter-labs/foundry-zksync/main/install-foundry-zksync | bash
```

## 关键 cast 命令

```bash
# Chain id (验证 chain 391 LIVE)
cast chain-id --rpc-url https://rpc-testnet.axblade.io

# 调 view 函数
cast call $POB "getBatchCount()(uint256)" --rpc-url $RPC

# 调 state-mutating 函数
cast send $POB "submitBatch(...)" --private-key $KEY --rpc-url $RPC

# Estimate gas
cast estimate $POB "submitBatch(...)" --rpc-url $RPC
```

## 已知坑

* `cast call` 返回科学记数 `[5e17]` — 用 `awk '{print $1}'` 截
* foundry-zksync 还在 v0.1.x，部分 forge feature 未支持


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