资产是bitshares中重要的一部分，看下bitshares的资产数据和获取方法。
asset json数据结构
先看一下资产的json数据结构，便于与界面、类等对应。
BTS "1.3.0"
{
"id": "1.3.0",
"symbol": "BTS",
"precision": 5,
"issuer": "1.2.3",
"options": {
"max_supply": "360057050210207",
"market_fee_percent": 0,
"max_market_fee": "1000000000000000",
"issuer_permissions": 0,
"flags": 0,
"core_exchange_rate": {
"base": {
"amount": 1,
"asset_id": "1.3.0"
},
"quote": {
"amount": 1,
"asset_id": "1.3.0"
}
},
"whitelist_authorities": [],
"blacklist_authorities": [],
"whitelist_markets": [],
"blacklist_markets": [],
"description": "",
"extensions": []
},
"dynamic_asset_data_id": "2.3.0"
}
bitUSD "1.3.121"
{
"id": "1.3.121",
"symbol": "USD",
"precision": 4,
"issuer": "1.2.0",
"options": {
"max_supply": "1000000000000000",
"market_fee_percent": 10,
"max_market_fee": "1000000000000000",
"issuer_permissions": 511,
"flags": 129,
"core_exchange_rate": {
"base": {
"amount": 26150000,
"asset_id": "1.3.121"
},
"quote": {
"amount": 871200000,
"asset_id": "1.3.0"
}
},
"whitelist_authorities": [],
"blacklist_authorities": [],
"whitelist_markets": [],
"blacklist_markets": [],
"description": "{\"main\":\"1 United States dollar\",\"market\":\"\"}",
"extensions": []
},
"dynamic_asset_data_id": "2.3.121",
"bitasset_data_id": "2.4.21"
}
bitCNY "1.3.113"
{
"id": "1.3.113",
"symbol": "CNY",
"precision": 4,
"issuer": "1.2.0",
"options": {
"max_supply": "1000000000000000",
"market_fee_percent": 10,
"max_market_fee": "1000000000000000",
"issuer_permissions": 511,
"flags": 129,
"core_exchange_rate": {
"base": {
"amount": 1425,
"asset_id": "1.3.113"
},
"quote": {
"amount": 7504,
"asset_id": "1.3.0"
}
},
"whitelist_authorities": [],
"blacklist_authorities": [],
"whitelist_markets": [],
"blacklist_markets": [],
"description": "{\"main\":\"1 Chinese yuan\",\"market\":\"\"}",
"extensions": []
},
"dynamic_asset_data_id": "2.3.113",
"bitasset_data_id": "2.4.13"
}
再看用get_objects方法取到的资产数据：
dynamic_asset_data_id:2.3.0
{"id":"2.3.0","current_supply":"261744197937804","confidential_supply":"28808061460","accumulated_fees":0,"fee_pool":10100000}
dynamic_asset_data_id:2.3.121
{"id":"2.3.121","current_supply":"123892155618","confidential_supply":3459,"accumulated_fees":52087049,"fee_pool":"12833117715"}
bitasset_data_id:2.4.21
{
"id": "2.4.21",
"feeds": [
["1.2.167", ["2018-04-20T05:37:39", {
"settlement_price": {
"base": {
"amount": 23360000,
"asset_id": "1.3.121"
},
"quote": {
"amount": 946500000,
"asset_id": "1.3.0"
}
},
"maintenance_collateral_ratio": 1750,
"maximum_short_squeeze_ratio": 1100,
"core_exchange_rate": {
"base": {
"amount": 25860000,
"asset_id": "1.3.121"
},
"quote": {
"amount": 997900000,
"asset_id": "1.3.0"
}
}
}]],
"comment":"此处省掉很多喂价方信息",
"current_feed": {
"settlement_price": {
"base": {
"amount": 2479,
"asset_id": "1.3.121"
},
"quote": {
"amount": 99498,
"asset_id": "1.3.0"
}
},
"maintenance_collateral_ratio": 1750,
"maximum_short_squeeze_ratio": 1100,
"core_exchange_rate": {
"base": {
"amount": 26150000,
"asset_id": "1.3.121"
},
"quote": {
"amount": 871200000,
"asset_id": "1.3.0"
}
}
},
"current_feed_publication_time": "2018-04-19T18:14:30",
"options": {
"feed_lifetime_sec": 86400,
"minimum_feeds": 7,
"force_settlement_delay_sec": 86400,
"force_settlement_offset_percent": 100,
"maximum_force_settlement_volume": 50,
"short_backing_asset": "1.3.0",
"extensions": []
},
"force_settled_volume": 0,
"is_prediction_market": false,
"settlement_price": {
"base": {
"amount": 0,
"asset_id": "1.3.0"
},
"quote": {
"amount": 0,
"asset_id": "1.3.0"
}
},
"settlement_fund": 0
}
bitshares-core asset对象定义
graphene/chain/asset_object.hpp
asset_dynamic_data_object
asset_object
asset_bitasset_data_object
在这三个类中有asset对象定义，可以与数据一一对应。
bitshares-ui界面
从这个图中可以与数据、与对象对应起来。
bitshares-ui代码
AssetActions.js
getAssetList
直接调用api "list_assets"，取到资产列表。
每个资产加入dynamicIDS列表，如果是bitAssetIDS则加入bitAssetIDS列表。
再调用api "get_objects"取得资产详细数据。
几个名词
CR(collateral ratio)
担保比率=担保物价值 / 债务
CP(call price)
CP = 担保物价值 / (债务 * 维持担保比率)
CER(core exchange rate)
maintenance collateral ratio (MCR): A ratio defined by the witnesses as minimum required collateral ratio
maximum short squeeze ratio (MSQR): A ratio defined by the witnesses as to how far shorts are protected against short squeezes
short squeeze protection (SQP): Defines the most that a margin position will ever be forced to pay to cover
call price (CP): The price at which short/borrow positions are margin called
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