Multiple EOS transfers in a single transaction

Question

Is it possible to pack a few transfers of EOS token to different accounts inside of single transaction? I know it's possible to pack multiple arbitrary actions inside one tx, but what about EOS token transfers specifically?

Answer 1

In a smart contract, you could do this by emplacing multiple actions into a single transaction, as follows:

transaction transfer;
transfer.actions.emplace_back(eosio::permission_level {_self, N(active) }, N(eosio.token), N(transfer), std::make_tuple(from_account, to_account_1, quantity_to_send, std::string("memo")));
transfer.actions.emplace_back(eosio::permission_level {_self, N(active) }, N(eosio.token), N(transfer), std::make_tuple(from_account, to_account_2, quantity_to_send, std::string("memo")));
transfer.actions.emplace_back(eosio::permission_level {_self, N(active) }, N(eosio.token), N(transfer), std::make_tuple(from_account, to_account_3, quantity_to_send, std::string("memo")));
transfer.send(0, _self, false);

You can do it with cleos by creating the json for each transfer, as follows:

cleos transfer from_account, to_account quantity memo -d -j -s 

This creates json output do this for all the transfers you want to do it for, it should look like this:

{
  "expiration": "2018-10-20T10:54:37",
    "ref_block_num": 92,
    "ref_block_prefix": 276911189,
    "max_net_usage_words": 0,
    "max_cpu_usage_ms": 0,
    "delay_sec": 0,
    "context_free_actions": [],
    "actions": [{
      "account": "eosio.token",
      "name": "transfer",
      "authorization": [{
        "actor": "fromaccount",
        "permission": "active"
      }
      ],
      "data": "00f2d4142123e95d0040c85353840ccd102700000000000004454f5300000000046d656d6f"
    }
    ],
    "transaction_extensions": [],
    "signatures": [],
    "context_free_data": []
}

{
  "expiration": "2018-10-20T10:54:42",
    "ref_block_num": 102,
    "ref_block_prefix": 3271438144,
    "max_net_usage_words": 0,
    "max_cpu_usage_ms": 0,
    "delay_sec": 0,
    "context_free_actions": [],
    "actions": [{
      "account": "eosio.token",
      "name": "transfer",
      "authorization": [{
        "actor": "fromaccount",
        "permission": "active"
      }
      ],
      "data": "00f2d4142123e95d0080c85353840ccd102700000000000004454f5300000000046d656d6f"
    }
    ],
    "transaction_extensions": [],
    "signatures": [],
    "context_free_data": []
}

{
  "expiration": "2018-10-20T10:54:45",
    "ref_block_num": 109,
    "ref_block_prefix": 718898287,
    "max_net_usage_words": 0,
    "max_cpu_usage_ms": 0,
    "delay_sec": 0,
    "context_free_actions": [],
    "actions": [{
      "account": "eosio.token",
      "name": "transfer",
      "authorization": [{
        "actor": "fromaccount",
        "permission": "active"
      }
      ],
      "data": "00f2d4142123e95d00c0c85353840ccd102700000000000004454f5300000000046d656d6f"
    }
    ],
    "transaction_extensions": [],
    "signatures": [],
    "context_free_data": []
}

To make this into one transaction, copy and paste each of the actions into the first json output, as follows:

{
  "expiration": "2018-10-20T10:54:37",
    "ref_block_num": 92,
    "ref_block_prefix": 276911189,
    "max_net_usage_words": 0,
    "max_cpu_usage_ms": 0,
    "delay_sec": 0,
    "context_free_actions": [],
    "actions": [{
      "account": "eosio.token",
      "name": "transfer",
      "authorization": [{
        "actor": "fromaccount",
        "permission": "active"
      }
      ],
      "data": "00f2d4142123e95d0040c85353840ccd102700000000000004454f5300000000046d656d6f"
    },{
      "account": "eosio.token",
      "name": "transfer",
      "authorization": [{
        "actor": "fromaccount",
        "permission": "active"
      }
      ],
      "data": "00f2d4142123e95d0080c85353840ccd102700000000000004454f5300000000046d656d6f"
    },{
      "account": "eosio.token",
      "name": "transfer",
      "authorization": [{
        "actor": "fromaccount",
        "permission": "active"
      }
      ],
      "data": "00f2d4142123e95d00c0c85353840ccd102700000000000004454f5300000000046d656d6f"
    }
    ],
    "transaction_extensions": [],
    "signatures": [],
    "context_free_data": []
}

Finally, save this json file, and execute it as follows:

cleos push transaction my_json_file.json

Answer 2

If you use python, you can try this code transactions

from ut import runcleos
import json


def _push_transaction(d):
    cmd = [
        "cleos",
        "-u",
        "https://api.eosbeijing.one",
        "push",
        "transaction",
        json.dumps(d),
    ]
    return runcleos(cmd)


def getaction(contract, action, data, f, p=False):
    """
    contract :要玩的合约地址
    action: 玩的方法
    data : 详细信息
    f :账号
    """
    cmd = [
        "cleos",
        "push",
        "action",
        contract,
        action,
        json.dumps(data),
        "-d",
        "-s",
        "-p",
        f,
    ]
    return json.loads(runcleos(cmd))


def push_transaction(actions):
    """
    actions是 由多个action组成
    每个action由 [合约账号,调用方法,调用参数,签名者] 组成
    """
    # actions = [
    #     ["eosio.token","transfer",["eosbocaira12", "redredredred", "1.0000 EOS", "save"],"eosbocaira12"],
    #     ["eosio.token","transfer",["eosbocaira12", "redredredred", "1.0000 EOS", "save"],"eosbocaira12"],
    #     ["eosio.token","transfer",["eosbocaira12", "redredredred", "1.0000 EOS", "save"],"eosbocaira12"],
    # ]
    for i in range(len(actions)):
        action = getaction(*actions[i])
        if i == 0:
            ret = action
        else:
            ret["actions"].extend(action["actions"])
    return _push_transaction(ret)


if __name__ == "__main__":
    actions = [
        [
            "eosio.token",
            "transfer",
            ["eosbocaira12", "redredredred", "1.0000 EOS", "save"],
            "eosbocaira12",
        ],
        [
            "eosio.token",
            "transfer",
            ["eosbocaira12", "redredredred", "1.0000 EOS", "save"],
            "eosbocaira12",
        ],
        [
            "eosio.token",
            "transfer",
            ["eosbocaira12", "redredredred", "1.0000 EOS", "save"],
            "eosbocaira12",
        ],
    ]
    print(push_transaction(actions))

Answer 3

You need to make different token contract for that which accepts more than one receivers and only one sender

For example current transfer function is

                        transfer(account_name from,
                        account_name to,
                        asset        quantity,
                        string       memo ) 

You need to modify that function like

                    transfer(account_name from,
                    account_name to1,
                    account_name to2,
                    .
                    .
                    .
                    account_name ton,
                    asset        quantity,
                    string       memo )