中移链（基于EOS）实战：如何调用RPC接口组装交易、签名、上链以及查询上链结果
id:BSN_2021
公众号：BSN研习社
红枣科技何来亮
背景：今年3月开放联盟链“中移链”在区块链服务网络（BSN[1]）中完成适配并上线发布,吸引了大批开发者，部分开发者提出了一些共性问题
目的：本篇文章是为了让读者了解如何在中移链(基于EOS)上调用RPC接口组装交易、签名、上链以及查询上链结果
适用对象：适用于BSN开放联盟链--中移链(基于EOS)开发者
1. 准备
•需要现在bsn[2]创建项目和创建一个账户，可以参考：https://bsnbase.com/static/tmpFile/bzsc/openper/7-3-6.html
•可以获取到eos 端点：https://opbningxia.bsngate.com:18602/api/aecb28acfd154cfeb90d0b6a8ecab1e7/rpc
•eos账户/合约地址：helailiang14
•为账户购买足够的资源(cpu、net、ram)
•安装EOSIO开发环境：需要安装cleos和keosd, 可以参考：https://developers.eos.io/welcome/latest/getting-started-guide/local-development-environment/installing-eosio-binaries •部署eos合约: hello.cpp
#include <eosio/eosio.hpp>
#include <eosio/transaction.hpp>
using namespace eosio;
// 通过[[eosio::contract]]标注这个类是一个合约
class [[eosio::contract]] hello : public contract
{
public:
using contract::contract;
// 在构造函数进行表对象的实例化, 标准合约构造函数,receiver也就是我们的合约账号(一般情况下)，code就是我们的action名称，ds就是数据流
// get_self() 合约所在的账号 get_code() 当前交易请求的action方法名 get_datastream() 当前数据流
hello(name receiver, name code, datastream<const char *> ds) : contract(receiver, code, ds), friend_table(get_self(), get_self().value)
{
}
// 用[[eosio::action]]标注这个方法是一个合约action就行
// 注意：action的名称要求符合name类型的规则
[[eosio::action]] void hi(name user)
{
print("Hello, ", user);
print("get_self,", get_self().value);
// print("get_code,", get_code().value);
uint32_t now = current_time_point().sec_since_epoch();
auto friend_itr = friend_table.find(user.value);
// 数据不存在
if (friend_itr == friend_table.end())
{
// 第一个参数就是内存使用的对象，第二个参数就是添加表对象时的委托方法。
friend_table.emplace(get_self(), [&](auto &f) {
f.friend_name = user;
f.visit_time = now;
});
}
else
{
// 第一个参数是传递需要修改的数据指针，第二个参数是内存使用的对象，第二个参数就是表对象修改时的委托方法
friend_table.modify(friend_itr, get_self(), [&](auto &f) {
f.visit_time = now;
});
}
}
[[eosio::action]] void nevermeet(name user)
{
print("Never see you again, ", user);
auto friend_itr = friend_table.find(user.value);
check(friend_itr != friend_table.end(), "I don't know who you are.");
// 只有一个参数，就是要删除的对象指针
friend_table.erase(friend_itr);
}
[[eosio::action]] void meetagain()
{
uint32_t now = current_time_point().sec_since_epoch();
auto time_idx = friend_table.get_index<"time"_n>();
auto last_meet_itr = time_idx.begin();
check(last_meet_itr != time_idx.end(), "I don't have a friend.");
time_idx.modify(last_meet_itr, get_self(), [&](auto &f) {
f.visit_time = now;
});
}
private:
// 定义一个结构体，然后用[[eosio::table]]标注这个结构体是一个合约表。在结构体里定义一个函数名primary_key，返回uint64_t类型，作为主键的定义
struct [[eosio::table]] my_friend
{
name friend_name;
uint64_t visit_time;
uint64_t primary_key() const { return friend_name.value; }
double by_secondary() const { return -visit_time; }
};
// 定义表名和查询索引 "friends"_n就是定义表名，所以使用了name类型，之后my_friend是表的结构类
typedef eosio::multi_index<"friends"_n, my_friend> friends;
friends friend_table;
};
2. rpc调用流程
1. 将交易信息由JSON格式序列化为BIN格式字符串
curl -X POST 'https://opbningxia.bsngate.com:18602/api/{您的开放联盟链项目ID/rpc/v1/chain/abi_json_to_bin'
-d '{
"code": "helailiang14",
"action": "hi",
"args": {
"user": "helloworld"
}
}'
------------------
return
{"binargs":"00408a97721aa36a"}
2. 获取当前最新的区块编号
curl GET 'https://opbningxia.bsngate.com:18602/api/{您的开放联盟链项目ID/rpc/v1/chain/get_info'
------------------
return
{
"server_version":"11d35f0f",
"chain_id":"9b4c6015f8b73b2d7ee3ebd92d249a1aba06a614e9990dcf54f7cf2e3d5172e1",
"head_block_num":15134328,
"last_irreversible_block_num":15134262,
"last_irreversible_block_id":"00e6ee360b5e7680a526ddea45db1be15c4be2cd2389020688218fe765be6db7",
"head_block_id":"00e6ee7889523875a28284effecdd1199cc960adb14c14c36cd1bd52afed6824",
"head_block_time":"2022-04-27T09:08:08.500",
"head_block_producer":"prod.b",
"virtual_block_cpu_limit":200000000,
"virtual_block_net_limit":1048576000,
"block_cpu_limit":199900,
"block_net_limit":1048576,
"server_version_string":"v3af0a20",
"fork_db_head_block_num":15134328,
"fork_db_head_block_id":"00e6ee7889523875a28284effecdd1199cc960adb14c14c36cd1bd52afed6824",
"server_full_version_string":"v3af0a20",
"last_irreversible_block_time":"2022-04-27T09:07:35.500"
}获取到head_block_num : 15134328
引用
获取 head_block_id：00e6ee7889523875a28284effecdd1199cc960adb14c14c36cd1bd52afed6824
引用
获取 chain_id: 9b4c6015f8b73b2d7ee3ebd92d249a1aba06a614e9990dcf54f7cf2e3d5172e1
3. 根据区块编号获取区块详情
curl -X POST 'https://opbningxia.bsngate.com:18602/api/{您的开放联盟链项目ID/rpc/v1/chain/get_block'
-d '{
"block_num_or_id": "15130610"
}'
------------------
return
{
"timestamp": "2022-04-27T09:08:08.500",
"producer": "prod.b",
"confirmed": 0,
"previous": "00e6ee77f2655528739622d2c9235026d4f10138b9821e46ea35165cb086d12d",
"transaction_mroot": "0000000000000000000000000000000000000000000000000000000000000000",
"action_mroot": "665584b582b234bf58d3708b31da20e14d266713e3bc6ce79ea3187cc2ffa5a4",
"schedule_version": 2,
"new_producers": null,
"producer_signature": "SIG_K1_KiYCDLMgE6gE1nNqQQL2jEEF3VVd6iaspAePvvJMjKwgg2Yf6GiTYcznrkymAdtZUAUFh28N8r9RzX936cASKDB6JW6ga3",
"transactions": [],
"id": "00e6ee7889523875a28284effecdd1199cc960adb14c14c36cd1bd52afed6824",
"block_num": 15134328,
"ref_block_prefix": 4018438818
}获取到
timestamp: 2022-04-27T09:08:08
4. 签署交易
使用EOSIO提供的签名工具实现签名：启动keosd后，才会提供签名服务
curl -X POST POST 'http://192.168.1.46:8800/v1/wallet/sign_transaction'
-d '[
{
"expiration": "2022-04-27T10:08:08",
"ref_block_num": 61048,
"ref_block_prefix": 4018438818,
"max_net_usage_words": 0,
"max_cpu_usage_ms": 0,
"delay_sec": 0,
"context_free_actions": [],
"actions": [
{
"account": "helailiang14",
"name": "hi",
"authorization": [
{
"actor": "helailiang14",
"permission": "active"
}
],
"data": "00408a97721aa36a"
}
],
"transaction_extensions": [],
"signatures": [],
"context_free_data": []
},
[
"EOS6F6PRkSaPyijTDBYskFbsxpGz53JMTFbEhua94fQEyf7pAMc7Y"
],
"9b4c6015f8b73b2d7ee3ebd92d249a1aba06a614e9990dcf54f7cf2e3d5172e1"
]'
------------------
return :
{
"expiration":"2022-04-27T10:08:08",
"ref_block_num":61048,
"ref_block_prefix":4018438818,
"max_net_usage_words":0,
"max_cpu_usage_ms":0,
"delay_sec":0,
"context_free_actions":[
],
"actions":[
{
"account":"helailiang14",
"name":"hi",
"authorization":[
{
"actor":"helailiang14",
"permission":"active"
}
],
"data":"00408a97721aa36a"
}
],
"transaction_extensions":[
],
"signatures":[
"SIG_K1_K2AzV2Pk4SP3PQhcdQ1bYgGZgr7PUUcJkAGowvncFV1ngrZufeCQpveAUBRYvNA5uyxFk2hKiot3Mu7FCW5rqqeoU5SVTo"
],
"context_free_data":[
]
}•
expiration过期时间。这里将timestamp加上了60分钟.•
ref_block_num: 由第二步返回的head_block_id 16进制的 然后字段截取前八位低4位 转10进制， ee78 ==> 61048•
ref_block_prefix：由第二步返回的head_block_id 16进制的 然后字段截取16到24 然后两个字节反转（a28284ef反转为ef8482a2） 转10进制, ef8482a2 ==> 4018438818•
account合约名称,即部署合约的账户•
name调用的合约方法。•
actor调用者。签名者•
data：第一步生成的bin字符串•
permission使用的权限类型•
EOS6F6PRkSaPyijTDBYskFbsxpGz53JMTFbEhua94fQEyf7pAMc7Y：签署此交易的公钥。实际上是由钱包中对应的私钥来签•
9b4c6015f8b73b2d7ee3ebd92d249a1aba06a614e9990dcf54f7cf2e3d5172e1: 是第二步获取的chain_id•
signatures: 签名结果SIG_K1_K2AzV2Pk4SP3PQhcdQ1bYgGZgr7PUUcJkAGowvncFV1ngrZufeCQpveAUBRYvNA5uyxFk2hKiot3Mu7FCW5rqqeoU5SVTo
5. 打包交易
使用 cleos convert pack_transaction将交易报文转换成 packed 格式
cleos convert pack_transaction '{
"expiration":"2022-04-27T10:08:08",
"ref_block_num":61048,
"ref_block_prefix":4018438818,
"max_net_usage_words": 0,
"max_cpu_usage_ms": 0,
"delay_sec": 0,
"context_free_actions": [],
"actions": [
{
"account": "helailiang14",
"name": "hi",
"authorization": [
{
"actor": "helailiang14",
"permission": "active"
}
],
"data": "00408a97721aa36a"
}
],
"transaction_extensions": []
}'
------------------
return：
{
"signatures": [],
"compression": "none",
"packed_context_free_data": "",
"packed_trx": "0816696278eea28284ef000000000140029bc64567a26a000000000000806b0140029bc64567a26a00000000a8ed32320800408a97721aa36a00"
}
packed_trx: 为交易报文的 packed 格式
6. 提交交易
curl -X POST 'https://opbningxia.bsngate.com:18602/api/{您的开放联盟链项目ID/rpc/v1/chain/push_transaction'
-d '{
"signatures": [
"SIG_K1_K2AzV2Pk4SP3PQhcdQ1bYgGZgr7PUUcJkAGowvncFV1ngrZufeCQpveAUBRYvNA5uyxFk2hKiot3Mu7FCW5rqqeoU5SVTo"
],
"compression": "none",
"packed_context_free_data": "",
"packed_trx": "0816696278eea28284ef000000000140029bc64567a26a000000000000806b0140029bc64567a26a00000000a8ed32320800408a97721aa36a00"
}'
------------------
return:
{
"transaction_id":"a69d03f6b1bab4bd8908124eef5e59d3e47df4063e697a07487308cde63a9f79",
"processed":{
"id":"a69d03f6b1bab4bd8908124eef5e59d3e47df4063e697a07487308cde63a9f79",
"block_num":15136664,
"block_time":"2022-04-27T09:27:36.500",
"producer_block_id":null,
"receipt":{
"status":"executed",
"cpu_usage_us":272,
"net_usage_words":13
},
"elapsed":272,
"net_usage":104,
"scheduled":false,
"action_traces":[
{
"action_ordinal":1,
"creator_action_ordinal":0,
"closest_unnotified_ancestor_action_ordinal":0,
"receipt":{
"receiver":"helailiang14",
"act_digest":"31ff1ecb2b0b0c89911b74c7930f08ecfefbd24ba59ef30a905d44068d2d8910",
"global_sequence":15199315,
"recv_sequence":2,
"auth_sequence":[
[
"helailiang14",
4
]
],
"code_sequence":1,
"abi_sequence":1
},
"receiver":"helailiang14",
"act":{
"account":"helailiang14",
"name":"hi",
"authorization":[
{
"actor":"helailiang14",
"permission":"active"
}
],
"data":{
"user":"helloworld"
},
"hex_data":"00408a97721aa36a"
},
"context_free":false,
"elapsed":63,
"console":"Hello, helloworldget_self,7683817463629939264",
"trx_id":"a69d03f6b1bab4bd8908124eef5e59d3e47df4063e697a07487308cde63a9f79",
"block_num":15136664,
"block_time":"2022-04-27T09:27:36.500",
"producer_block_id":null,
"account_ram_deltas":[
],
"account_disk_deltas":[
],
"except":null,
"error_code":null,
"return_value_hex_data":"",
"inline_traces":[
]
}
],
"account_ram_delta":null,
"except":null,
"error_code":null
}
}
signatures: 为第4步签名的结果
packed_trx: 为第5步的报文转换结果
7. 查询表数据
curl -X POST 'https://opbningxia.bsngate.com:18602/api/{您的开放联盟链项目ID/rpc/v1/chain/get_table_rows'
-d'{
"code": "helailiang14",
"table": "friends",
"scope": "helailiang14",
"json": true
}'
------------------
return:
{
"rows":[
{
"friend_name":"helloworld",
"visit_time":1651051656
}
],
"more":false,
"next_key":"",
"next_key_bytes":""
}数据[helloworld]已经写到table中
References
[1] BSN: https://bsnbase.com/[2] bsn: https://bsnbase.com/p/home/Openalliance/projectManagement
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