dry_run的时候，显示token的变化量和余额

[wk3368]

提醒用户，防止恶意的合约造成用户损失。

[wk3368]

一个转账的交易：

curl --location --request POST 'https://barnard-seed.starcoin.org'
--header 'Content-Type: application/json'
--data-raw '{
"id":200,
"jsonrpc":"2.0",
"method":"contract.dry_run",
"params":[
{
"chain_id": 251,
"gas_unit_price": 1,
"sender": "0x3f19d5422824f47e6c021978cee98f35",
"sender_public_key": "0xc51dada886afe59d4651f36b56f3c4a1a84da53dfbddf396d81a5b36ab5cdc26",
"sequence_number": 325,
"max_gas_amount": 10000000,
"script": {
"code": "0x1::TransferScripts::peer_to_peer_v2",
"type_args": ["0x1::STC::STC"],
"args": ["0xd42cce7f1afe838b9f40a6583da07693", "10000000u128"]
}
}
]
}'

这是dry_run的rensponse：

{
    "jsonrpc": "2.0",
    "result": {
        "events": [
            {
                "data": "0x000000000000000000000000000000010353544303535443",
                "event_key": "0x0200000000000000d42cce7f1afe838b9f40a6583da07693",
                "event_seq_number": "0",
                "type_tag": "0x00000000000000000000000000000001::Account::AcceptTokenEvent"
            },
            {
                "data": "0x8096980000000000000000000000000000000000000000000000000000000001035354430353544300",
                "event_key": "0x00000000000000003f19d5422824f47e6c021978cee98f35",
                "event_seq_number": "211",
                "type_tag": "0x00000000000000000000000000000001::Account::WithdrawEvent"
            },
            {
                "data": "0x8096980000000000000000000000000000000000000000000000000000000001035354430353544300",
                "event_key": "0x0100000000000000d42cce7f1afe838b9f40a6583da07693",
                "event_seq_number": "0",
                "type_tag": "0x00000000000000000000000000000001::Account::DepositEvent"
            }
        ],
        "explained_status": "Executed",
        "gas_used": "284531",
        "status": "Executed",
        "write_set": [
            {
                "access_path": "0x00000000000000000000000000000001/1/0x00000000000000000000000000000001::TransactionFee::TransactionFee<0x00000000000000000000000000000001::STC::STC>",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "fee": {
                                "value": 284531
                            }
                        },
                        "raw": "0x73570400000000000000000000000000"
                    }
                }
            },
            {
                "access_path": "0x3f19d5422824f47e6c021978cee98f35/1/0x00000000000000000000000000000001::Account::Account",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "accept_token_events": {
                                "counter": 9,
                                "guid": "0x02000000000000003f19d5422824f47e6c021978cee98f35"
                            },
                            "authentication_key": "0xc804cb6c5652488f61386a0107bc88cd3f19d5422824f47e6c021978cee98f35",
                            "deposit_events": {
                                "counter": 932,
                                "guid": "0x01000000000000003f19d5422824f47e6c021978cee98f35"
                            },
                            "key_rotation_capability": {
                                "vec": [
                                    {
                                        "account_address": "0x3f19d5422824f47e6c021978cee98f35"
                                    }
                                ]
                            },
                            "sequence_number": 326,
                            "withdraw_events": {
                                "counter": 212,
                                "guid": "0x00000000000000003f19d5422824f47e6c021978cee98f35"
                            },
                            "withdrawal_capability": {
                                "vec": [
                                    {
                                        "account_address": "0x3f19d5422824f47e6c021978cee98f35"
                                    }
                                ]
                            }
                        },
                        "raw": "0x20c804cb6c5652488f61386a0107bc88cd3f19d5422824f47e6c021978cee98f35013f19d5422824f47e6c021978cee98f35013f19d5422824f47e6c021978cee98f35d4000000000000001800000000000000003f19d5422824f47e6c021978cee98f35a4030000000000001801000000000000003f19d5422824f47e6c021978cee98f3509000000000000001802000000000000003f19d5422824f47e6c021978cee98f354601000000000000"
                    }
                }
            },
            {
                "access_path": "0x3f19d5422824f47e6c021978cee98f35/1/0x00000000000000000000000000000001::Account::Balance<0x00000000000000000000000000000001::STC::STC>",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "token": {
                                "value": 1367306027555
                            }
                        },
                        "raw": "0x2342ca593e0100000000000000000000"
                    }
                }
            },
            {
                "access_path": "0xd42cce7f1afe838b9f40a6583da07693/1/0x00000000000000000000000000000001::Account::Account",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "accept_token_events": {
                                "counter": 1,
                                "guid": "0x0200000000000000d42cce7f1afe838b9f40a6583da07693"
                            },
                            "authentication_key": "0x0000000000000000000000000000000000000000000000000000000000000000",
                            "deposit_events": {
                                "counter": 1,
                                "guid": "0x0100000000000000d42cce7f1afe838b9f40a6583da07693"
                            },
                            "key_rotation_capability": {
                                "vec": [
                                    {
                                        "account_address": "0xd42cce7f1afe838b9f40a6583da07693"
                                    }
                                ]
                            },
                            "sequence_number": 0,
                            "withdraw_events": {
                                "counter": 0,
                                "guid": "0x0000000000000000d42cce7f1afe838b9f40a6583da07693"
                            },
                            "withdrawal_capability": {
                                "vec": [
                                    {
                                        "account_address": "0xd42cce7f1afe838b9f40a6583da07693"
                                    }
                                ]
                            }
                        },
                        "raw": "0x20000000000000000000000000000000000000000000000000000000000000000001d42cce7f1afe838b9f40a6583da0769301d42cce7f1afe838b9f40a6583da076930000000000000000180000000000000000d42cce7f1afe838b9f40a6583da076930100000000000000180100000000000000d42cce7f1afe838b9f40a6583da076930100000000000000180200000000000000d42cce7f1afe838b9f40a6583da076930000000000000000"
                    }
                }
            },
            {
                "access_path": "0xd42cce7f1afe838b9f40a6583da07693/1/0x00000000000000000000000000000001::Account::AutoAcceptToken",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "enable": true
                        },
                        "raw": "0x01"
                    }
                }
            },
            {
                "access_path": "0xd42cce7f1afe838b9f40a6583da07693/1/0x00000000000000000000000000000001::Account::Balance<0x00000000000000000000000000000001::STC::STC>",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "token": {
                                "value": 10000000
                            }
                        },
                        "raw": "0x80969800000000000000000000000000"
                    }
                }
            },
            {
                "access_path": "0xd42cce7f1afe838b9f40a6583da07693/1/0x00000000000000000000000000000001::Event::EventHandleGenerator",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "addr": "0xd42cce7f1afe838b9f40a6583da07693",
                            "counter": 3
                        },
                        "raw": "0x0300000000000000d42cce7f1afe838b9f40a6583da07693"
                    }
                }
            }
        ]
    },
    "id": 200
}

1. 把events数组里面的每一条记录给解析出来？
2. dry_run和 dry_run_raw的response是一样的，对不？

[jolestar]

主要是通过 access_path 来判断，比如：

     {
                "access_path": "0xd42cce7f1afe838b9f40a6583da07693/1/0x00000000000000000000000000000001::Account::Balance<0x00000000000000000000000000000001::STC::STC>",
                "action": "Value",
                "value": {
                    "Resource": {
                        "json": {
                            "token": {
                                "value": 10000000
                            }
                        },
                        "raw": "0x80969800000000000000000000000000"
                    }
                }
            },

这个就是用户 stc 余额的变化。相当于通过 dry run 的 output 和用户当前的状态进行比较，发现 diff。感觉这个可以提供成 js sdk 的方法，别的地方应该也可以用到。

[jolestar]

感觉 Event 也可以利用一下，但没想好怎么用。

[wk3368]

"access_path": "0xd42cce7f1afe838b9f40a6583da07693/1/0x00000000000000000000000000000001::Account::Balance<0x00000000000000000000000000000001::STC::STC>",

这个access_path的路径有规律吗？

/1/0x00000000000000000000000000000001::Account::Balance 是这样的规律吗？

[jolestar]

address/1代表resource/StructTag value 是 resource bcs 二进制
address/0代表code/ModuleName value 是 module bytecode

[wk3368]

swap的交易确认页面，效果如图，包括了token的图标，名字，余额前后的值和变化量，鼠标滑过token图标，会显示tokenCode的全称。

[wk3368]

Supported in V4.6.0