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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