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root@iZj6cgy98yiuluw41gz0aoZ:~# cleos -u http://eu1.eosdac.io get actions bcskillsurou
#  seq  when                              contract::action => receiver      trx id...   args

发帖时可用。
数据来源： eosfans

本篇文章演示基于EOS Tracker获取和展示EOS MongoDb 数据。
所需的EOS Tracker为一修改版本,支持MongoDb，原版发帖时只支持MySql。

安装php 7.2

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install php7.2

安装PHP扩展

sudo apt-get install php7.2-mongodb
sudo apt-get install php7.2-cli
sudo apt-get install php7.2-xml
sudo apt-get install php7.2-mbstring php7.2-intl php7.2-redis -y
apt-get install composer

获取代码

git clone https://github.com/FeeSimple/eos-tracker.git

开始部署EOS Tracker API

进入eos-tracker/eos-tracker-api，更新安装EOS Tracker API子项目

composer update
composer install

修改MongDB for eos-tracker-api的配置文件

app/config/parameters.yml

# This file is auto-generated during the composer install parameters:
secret: 123 //一般默认为空
mongodb_server: 'mongodb://localhost:27017'
db_name: EOStest

开始运行

php bin/console server:run 0.0.0.0:8000

开始部署EOS Tracker前端项目

进入eos-tracker/eos-tracker-frontend
安装项目依赖

npm i
npm install -g @angular/cli@6.0.8

EOS Tracker是一个基于Angular4的前端，连接到EOS Tracker API。
用于与eos-tracker-api交互的eos-tracker-frontend的配置文件：

src/environments/environment.ts

    export const environment = {
        production: false,
        walletUrl: '//www.bcskill.com',
        appName: 'EOS Tracker',
        logoUrl: '/assets/logo.png',
        apiUrl: '//www.bcskill.com:8000', //修改为与上面API地址和端口一致
        blockchainUrl: '//rpc.bcskill.com:8888' //修改为已同步全部EOS区块的RPC服务器地址
    };

开始启动

ng serve --host 0.0.0.0 --port 4200

常见问题

• Cannot read property 'write' of undefined

  npm uninstall -g @angular/cli
  npm install -g @angular/cli@6.0.8

• add-apt-repository: command not found

  sudo apt-get install python-software-properties
  sudo apt-get update
  sudo apt install software-properties-common 
  sudo apt-get update

  参考：stackoverflow

• ubuntu npm 升级到新版
  （打开连接）

方式一：从apt-get安装

1. 添加mongodb签名到APT

   sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927

2. 创建/etc/apt/sources.list.d/mongodb-org-3.2.list文件并写入命令

   echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list

3. 更新软件源列表

   sudo apt-get update

4. 安装mongodb（默认是安装稳定版）

   sudo apt-get install -y mongodb-org

   或者安装指定版本：

   sudo apt-get install -y mongodb-org=3.2.9 mongodb-org-server=3.2.9 mongodb-org-shell=3.2.9 mongodb-org-mongos=3.2.9 mongodb-org-tools=3.2.9

方式二：从 .tar.gz 二进制包安装

1. 下载最新安装包
   官网下载地址：https://www.mongodb.com/download-center?jmp=nav#community.

   curl -O https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1404-3.2.9.tgz

2. 解压

   tar -zxvf mongodb-linux-x86_64-ubuntu1404-3.2.9.tgz

3. 重命名并移动到安装目录（可自定义）

   sudo mv mongodb-linux-x86_64-3.0.6/ /usr/local/mongodb   # 将解压包拷贝到指定目录进行安装

4. 创建 mongo 的数据目录
   MongoDB 默认的数据目录是 /data/db/ ，就直接使用默认的。

   sudo mkdir -p /data/db    #创建数据存储目录
   sudo chmod 755 /data/*    #赋予目录权限

5. 启动

   mongod    #启动服务端
   mongo    #启动客户端

   配置MongoDB

   控制的配置文件在：/etc/mongodb.conf
   控制脚本在：/etc/init.d/mongodb
   MongoDB实例会把数据存放在：/var/lib/mongodb
   日志存放在：/var/log/mongodb
   默认由mongodb用户运行。
   如果如果显示目录不存在的话，需要运行下列命令指定文件夹：

   mongod --dbpath /var/lib/mongodb

   如果想要切换用户运行MongoDB的话，需要设置 /var/lib/mongodb 、 /var/log/mongodb两个目录的权限

   启动、停止、重启

   sudo service mongodb start
   sudo service mongodb stop
   sudo service mongodb restart

   通过mongodb shell测试安装结果

   mongodb

卸载MongoDB

1. 停止MongoDB

   sudo service mongod stop

2. 移除包文件

   sudo apt-get purge mongodb-org*

3. 删除存放数据的目录

   sudo rm -r /var/log/mongodbsudo rm -r /var/lib/mongodb

   参考文档

   MongoDB官方文档：https://docs.mongodb.com/getting-started/shell/tutorial/install-mongodb-on-ubuntu/
   Ubuntu下MongoDB 安装教程及简单操作：http://www.linuxidc.com/Linux/2016-07/133254.htm

当卖内存字节数按当时内存价格所值的EOS数，如果小于0.0001，则交易出错

root@iZj6cbx3duprxf6dasczbpZ:~# cleos system sellram dapp.exec 1
1483958ms thread-0   main.cpp:438                  create_action        ] result: {"binargs":"000040aa2b50ab490100000000000000"} arg: {"code":"eosio","action":"sellram","args":{"account":"dapp.exec","bytes":1}} 
Error 3050003: eosio_assert_message assertion failure
Error Details:
assertion failure with message: token amount received from selling ram is too low
pending console output:

void system_contract::sellram( account_name account, int64_t bytes ) {
      require_auth( account );
      eosio_assert( bytes > 0, "cannot sell negative byte" );

      user_resources_table  userres( _self, account );
      auto res_itr = userres.find( account );
      eosio_assert( res_itr != userres.end(), "no resource row" );
      eosio_assert( res_itr->ram_bytes >= bytes, "insufficient quota" );

      asset tokens_out;
      auto itr = _rammarket.find(S(4,RAMCORE));
      _rammarket.modify( itr, 0, [&]( auto& es ) {
          /// the cast to int64_t of bytes is safe because we certify bytes is <= quota which is limited by prior purchases
          tokens_out = es.convert( asset(bytes,S(0,RAM)), CORE_SYMBOL);
      });

      eosio_assert( tokens_out.amount > 1, "token amount received from selling ram is too low" );

当按EOS买内存时，如果所支出的EOS扣除0.5%手续费后的余额，按当时内存价格所购买的字节数小于1，则出错"must reserve a positive amount"

void system_contract::buyram( account_name payer, account_name receiver, asset quant )
   {
      require_auth( payer );
      eosio_assert( quant.amount > 0, "must purchase a positive amount" );

      auto fee = quant;
      fee.amount = ( fee.amount + 199 ) / 200; /// .5% fee (round up)
      // fee.amount cannot be 0 since that is only possible if quant.amount is 0 which is not allowed by the assert above.
      // If quant.amount == 1, then fee.amount == 1,
      // otherwise if quant.amount > 1, then 0 < fee.amount < quant.amount.
      auto quant_after_fee = quant;
      quant_after_fee.amount -= fee.amount;
      // quant_after_fee.amount should be > 0 if quant.amount > 1.
      // If quant.amount == 1, then quant_after_fee.amount == 0 and the next inline transfer will fail causing the buyram action to fail.

      INLINE_ACTION_SENDER(eosio::token, transfer)( N(eosio.token), {payer,N(active)},
         { payer, N(eosio.ram), quant_after_fee, std::string("buy ram") } );

      if( fee.amount > 0 ) {
         INLINE_ACTION_SENDER(eosio::token, transfer)( N(eosio.token), {payer,N(active)},
                                                       { payer, N(eosio.ramfee), fee, std::string("ram fee") } );
      }

      int64_t bytes_out;

      const auto& market = _rammarket.get(S(4,RAMCORE), "ram market does not exist");
      _rammarket.modify( market, 0, [&]( auto& es ) {
          bytes_out = es.convert( quant_after_fee,  S(0,RAM) ).amount;
      });

      eosio_assert( bytes_out > 0, "must reserve a positive amount" );

当按字节数买内存时，内部会先按当时内存价格计算出所需的EOS价格，如果计算出的EOS扣除0.5%手续费后的余额，按当时内存价格所购买的字节数小于1，也会出错"must reserve a positive amount"

{
    "id": "fe804e9a9ab2a9f8b674bb490ac2c89d4f70247f82bc506adc7285cb82e3c991",
    "trx": {
        "receipt": {
            "status": "executed",
            "cpu_usage_us": 688,
            "net_usage_words": 16,
            "trx": [
                1,
                {
                    "signatures": [
                        "SIG_K1_KUypLM5YSdRRZMTuTDUAu4fr4V3FhabKJdGdNcZTaTj5zbsB1xfta3FvL5XEGkaduako2yVaHhQxLc5hm8TjpmGarXDRoM"
                    ],
                    "compression": "none",
                    "packed_context_free_data": "",
                    "packed_trx": "d27c555bc5a54ba71421000000000100a6823403ea3055000000572d3ccdcd0130c618630c05a77900000000a8ed32322130c618630c05a77990b1cadec45aab49204e00000000000004454f53000000000000"
                }
            ]
        },
        "trx": {
            "expiration": "2018-07-23T06:59:30",
            "ref_block_num": 42437,
            "ref_block_prefix": 555001675,
            "max_net_usage_words": 0,
            "max_cpu_usage_ms": 0,
            "delay_sec": 0,
            "context_free_actions": [],
            "actions": [
                {
                    "account": "eosio.token",
                    "name": "transfer",
                    "authorization": [
                        {
                            "actor": "bcskill3333333",
                            "permission": "active"
                        }
                    ],
                    "data": {
                        "from": "bcskill3333333",
                        "to": "dappplaytest",
                        "quantity": "2.0000 EOS",
                        "memo": ""
                    },
                    "hex_data": "30c618630c05a77990b1cadec45aab49204e00000000000004454f530000000000"
                }
            ],
            "transaction_extensions": [],
            "signatures": [
                "SIG_K1_KUypLM5YSdRRZMTuTDUAu4fr4V3FhabKJdGdNcZTaTj5zbsB1xfta3FvL5XEGkaduako2yVaHhQxLc5hm8TjpmGarXDRoM"
            ],
            "context_free_data": []
        }
    },
    "block_time": "2018-07-23T06:58:32.000",
    "block_num": 7317258,
    "last_irreversible_block": 8006080,
    "traces": [
        {
            "receipt": {
                "receiver": "eosio.token",
                "act_digest": "c6c9aa38acd0c3940de511b6ee69b1831f047f895b4aa94a6cde8ae80dfdd6a5",
                "global_sequence": 74737287,
                "recv_sequence": 2145761,
                "auth_sequence": [
                    [
                        "bcskill3333333",
                        6
                    ]
                ],
                "code_sequence": 1,
                "abi_sequence": 1
            },
            "act": {
                "account": "eosio.token",
                "name": "transfer",
                "authorization": [
                    {
                        "actor": "bcskill3333333",
                        "permission": "active"
                    }
                ],
                "data": {
                    "from": "bcskill3333333",
                    "to": "dappplaytest",
                    "quantity": "2.0000 EOS",
                    "memo": ""
                },
                "hex_data": "30c618630c05a77990b1cadec45aab49204e00000000000004454f530000000000"
            },
            "elapsed": 42,
            "cpu_usage": 0,
            "console": "",
            "total_cpu_usage": 0,
            "trx_id": "fe804e9a9ab2a9f8b674bb490ac2c89d4f70247f82bc506adc7285cb82e3c991",
            "inline_traces": [
                {
                    "receipt": {
                        "receiver": "bcskill3333333",
                        "act_digest": "c6c9aa38acd0c3940de511b6ee69b1831f047f895b4aa94a6cde8ae80dfdd6a5",
                        "global_sequence": 74737288,
                        "recv_sequence": 19,
                        "auth_sequence": [
                            [
                                "bcskill3333333",
                                7
                            ]
                        ],
                        "code_sequence": 1,
                        "abi_sequence": 1
                    },
                    "act": {
                        "account": "eosio.token",
                        "name": "transfer",
                        "authorization": [
                            {
                                "actor": "bcskill3333333",
                                "permission": "active"
                            }
                        ],
                        "data": {
                            "from": "bcskill3333333",
                            "to": "dappplaytest",
                            "quantity": "2.0000 EOS",
                            "memo": ""
                        },
                        "hex_data": "30c618630c05a77990b1cadec45aab49204e00000000000004454f530000000000"
                    },
                    "elapsed": 3,
                    "cpu_usage": 0,
                    "console": "",
                    "total_cpu_usage": 0,
                    "trx_id": "fe804e9a9ab2a9f8b674bb490ac2c89d4f70247f82bc506adc7285cb82e3c991",
                    "inline_traces": []
                },
                {
                    "receipt": {
                        "receiver": "dappplaytest",
                        "act_digest": "c6c9aa38acd0c3940de511b6ee69b1831f047f895b4aa94a6cde8ae80dfdd6a5",
                        "global_sequence": 74737289,
                        "recv_sequence": 1,
                        "auth_sequence": [
                            [
                                "bcskill3333333",
                                8
                            ]
                        ],
                        "code_sequence": 1,
                        "abi_sequence": 1
                    },
                    "act": {
                        "account": "eosio.token",
                        "name": "transfer",
                        "authorization": [
                            {
                                "actor": "bcskill3333333",
                                "permission": "active"
                            }
                        ],
                        "data": {
                            "from": "bcskill3333333",
                            "to": "dappplaytest",
                            "quantity": "2.0000 EOS",
                            "memo": ""
                        },
                        "hex_data": "30c618630c05a77990b1cadec45aab49204e00000000000004454f530000000000"
                    },
                    "elapsed": 5,
                    "cpu_usage": 0,
                    "console": "",
                    "total_cpu_usage": 0,
                    "trx_id": "fe804e9a9ab2a9f8b674bb490ac2c89d4f70247f82bc506adc7285cb82e3c991",
                    "inline_traces": []
                }
            ]
        },
        {
            "receipt": {
                "receiver": "bcskill3333333",
                "act_digest": "c6c9aa38acd0c3940de511b6ee69b1831f047f895b4aa94a6cde8ae80dfdd6a5",
                "global_sequence": 74737288,
                "recv_sequence": 19,
                "auth_sequence": [
                    [
                        "bcskill3333333",
                        7
                    ]
                ],
                "code_sequence": 1,
                "abi_sequence": 1
            },
            "act": {
                "account": "eosio.token",
                "name": "transfer",
                "authorization": [
                    {
                        "actor": "bcskill3333333",
                        "permission": "active"
                    }
                ],
                "data": {
                    "from": "bcskill3333333",
                    "to": "dappplaytest",
                    "quantity": "2.0000 EOS",
                    "memo": ""
                },
                "hex_data": "30c618630c05a77990b1cadec45aab49204e00000000000004454f530000000000"
            },
            "elapsed": 3,
            "cpu_usage": 0,
            "console": "",
            "total_cpu_usage": 0,
            "trx_id": "fe804e9a9ab2a9f8b674bb490ac2c89d4f70247f82bc506adc7285cb82e3c991",
            "inline_traces": []
        },
        {
            "receipt": {
                "receiver": "dappplaytest",
                "act_digest": "c6c9aa38acd0c3940de511b6ee69b1831f047f895b4aa94a6cde8ae80dfdd6a5",
                "global_sequence": 74737289,
                "recv_sequence": 1,
                "auth_sequence": [
                    [
                        "bcskill3333333",
                        8
                    ]
                ],
                "code_sequence": 1,
                "abi_sequence": 1
            },
            "act": {
                "account": "eosio.token",
                "name": "transfer",
                "authorization": [
                    {
                        "actor": "bcskill3333333",
                        "permission": "active"
                    }
                ],
                "data": {
                    "from": "bcskill3333333",
                    "to": "dappplaytest",
                    "quantity": "2.0000 EOS",
                    "memo": ""
                },
                "hex_data": "30c618630c05a77990b1cadec45aab49204e00000000000004454f530000000000"
            },
            "elapsed": 5,
            "cpu_usage": 0,
            "console": "",
            "total_cpu_usage": 0,
            "trx_id": "fe804e9a9ab2a9f8b674bb490ac2c89d4f70247f82bc506adc7285cb82e3c991",
            "inline_traces": []
        }
    ]
}

traces里面的你可以理解为是给参与这次交易的各个角色的发票清单 每一次EOS的转账都涉及到3个角色：转账方、接受方、执行转账操作的token发行方,如果是收款方查到的只是其中一个