合约说明
System合约是eosforce系统关键功能的实现合约，替换原eosio.system系统合约。 包括投票、分红等，对eos原有逻辑的修改。 改合约使用eosio账户发布，固定在初始化代码中。
合约方法 action
转账
void transfer( const account_name from, const account_name to, const asset quantity, const string memo );
参数：
from : 转账账号
to : 收款账号
quantity : 金额，必须是 EOS资产
memo : 备注, 必须小于256字节
设置BP（区块生产者）
void updatebp( const account_name bpname, const public_key producer_key, const uint32_t commission_rate, const std::string & url );
添加、修改节点信息
参数：
bpnbame : 节点账号
producer_key : 节点公钥
commission_rate : 分红比列 单位:万分之1, 范围:大于等于1，小于等于10000
url : 官网链接， 不超过64字节
投票
void vote( const account_name voter, const account_name bpname, const asset stake );
给超级节点投票
参数:
voter : 投票者
bpbame : 节点
statke : 票数（eos金额）
逻辑:
设置用户的投票信息： 投票数大于当前票数，增加投票； 投票数小于当前票数，撤回投票；
根据投票数减少相应用户余额
增加节点的总票数， 结算节点当前总票龄
解冻
void unfreeze( const account_name voter, const account_name bpname );
撤回投票要冻结3天(根据块数确定，每3秒一块)，3天后可执行解冻。
逻辑：
将撤回票数 加到可用余额中。清空撤回票数。
领取分红
void claim( const account_name voter, const account_name bpname );
参数:
voter : 投票者
bpname : 节点名
逻辑:
计算投票账号最新票龄：上次票龄+票数*(当前块高度-上次结算时块高度)
计算节点的总票龄：上次票龄+票数*(当前块高度-节点上次结算时块高度)
计算分红数：节点奖池总数*投票者总票龄/节点总票龄
增加投票账号余额 +=分红数
投票信息票龄清零，更新结算块高度
减少节点奖池 -=分红数，总票龄减少账号票龄，更新计算块高度
出块回调函数 (系统内部使用)
void onblock(…const account_name bpname,const uint32_t schedule_version);
参数:
bpname : 节点名
schedule_version : 节点排行换届版本
逻辑:
出块节点bpname，producer.amount出块数加1
每个出块奖励9个EOS，按分红比例，将奖励加入出块节点余额，并将剩余分红加入出块节点的奖池中。
每个出块将奖励1个EOS给b1账号(block.one)
每100个块(即5分钟)更新一次超级节点排行. 刷新选举的23个超级节点，遍历所有bp查前23个，调用wasm接口set_proposed_producers重置BP,修改数据库数据
扣除手续费 (系统内部使用)
void onfee( const account_name actor, const asset fee, const account_name bpname );
所有操作的手续费最终调此action执行，根据手续费扣除账号余额，并增加到打包此区块的节点余额中。
参数:
actor : 执行者
fee : 手续费
bpname : 打包的节点名
设置链紧急状态
void setemergency( const account_name bpname, const bool emergency );
超过三分之二的节点设置紧急状态，则链将处于紧急状态。将紧急停用所有功能。 参数:
bpname : 节点
emergency : 紧急状态
abi
System
"tables": [ { "name":"accounts", "type":"account_info", "index_type": "i64", "key_names" : ["name"], "key_types" : ["account_name"] },{ "name":"bps", "type":"bp_info", "index_type":"i64", "key_names": ["name"], "key_types": ["account_name"] },{ "name":"votes", "type":"vote_info", "index_type":"i64", "key_names": ["bpname"], "key_types": ["account_name"] },{ "name":"chainstatus", "type":"chain_status", "index_type":"i64", "key_names": ["name"], "key_types": ["account_name"] },{ "name":"schedules", "type":"schedule_info", "index_type":"i64", "key_names": ["version"], "key_types": ["uint64"] } ]
"structs": [{ "name": "transfer", "base": "", "fields": [ {"name":"from", "type":"account_name"}, {"name":"to", "type":"account_name"}, {"name":"quantity", "type":"asset"}, {"name":"memo", "type":"string"} ] },{ "name": "updatebp", "base": "", "fields": [ {"name":"bpname", "type":"account_name"}, {"name":"block_signing_key", "type":"public_key"}, {"name":"commission_rate", "type":"uint32"}, {"name":"url", "type":"string"} ] },{ "name": "unfreeze", "base": "", "fields": [ {"name":"voter", "type":"account_name"}, {"name":"bpname", "type":"account_name"} ] },{ "name": "claim", "base": "", "fields": [ {"name":"voter", "type":"account_name"}, {"name":"bpname", "type":"account_name"} ] },{ "name": "account_info", "base": "", "fields": [ {"name":"name", "type":"account_name"}, {"name":"available", "type":"asset"} ] },{ "name": "vote_parameter", "base": "", "fields": [ {"name":"voter", "type":"account_name"}, {"name":"bpname", "type":"account_name"}, {"name":"stake", "type":"asset"} ] },{ "name": "vote_info", "base": "", "fields": [ {"name":"bpname", "type":"account_name"}, {"name":"staked", "type":"asset"}, {"name":"voteage", "type":"int64"}, {"name":"voteage_update_height", "type":"uint32"}, {"name":"unstaking", "type":"asset"}, {"name":"unstake_height", "type":"uint32"} ] },{ "name": "bp_info", "base": "", "fields": [ {"name":"name", "type":"account_name"}, {"name":"block_signing_key", "type":"public_key"}, {"name":"commission_rate", "type":"uint32"}, {"name":"total_staked", "type":"int64"}, {"name":"rewards_pool", "type":"asset"}, {"name":"total_voteage", "type":"int64"}, {"name":"voteage_update_height","type":"uint32"}, {"name":"url", "type":"string"}, {"name":"emergency", "type":"bool"} ] },{ "name": "setemergency", "base": "", "fields": [ {"name":"bpname", "type":"account_name"}, {"name":"emergency", "type":"bool"} ] },{ "name": "chain_status", "base": "", "fields": [ {"name":"name", "type":"account_name"}, {"name":"emergency", "type":"bool"} ] },{ "name": "producer", "base": "", "fields": [ {"name":"bpname", "type":"account_name"}, {"name":"amount", "type":"uint32"} ] },{ "name": "schedule_info", "base": "", "fields": [ {"name":"version", "type":"uint64"}, {"name":"block_height","type":"uint32"}, {"name":"producers", "type":"producer[]"} ] } ]
END
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