Using EOS RPC API to Transfer EOS
This tutorial mainly uses the RPC API of EOS to use the RPC interface to operate the issued tokens. The following experiments are based on the EOS of eosio/eos:20180521.
Deploy Token Contract
Create an account
cleos create account eosio eosio.token EOS5ySgzeHp9G7TqNDGpyzaCtahAeRcTvPRPJbFey5CmySL3vKYgE EOS5ySgzeHp9G7TqNDGpyzaCtahAeRcTvPRPJbFey5CmySL3vKYgE
Operation result:
executed transaction: 4a8b53ae6fa5e22ded33b50079e45550e39f3cb72ffa628e771ea21758844039 200 bytes 339 us
# eosio <= eosio::newaccount {"creator":"eosio","name":"eosio.token","owner":{"threshold":1,"keys":[{"key":"EOS5ySgzeHp9G7TqNDGpy...
Deployment Contract
cleos set contract eosio.token /opt/eosio/bin/data-dir/contracts/eosio.token -p eosio.token
result:
Reading WAST/WASM from /opt/eosio/bin/data-dir/contracts/eosio.token/eosio.token.wasm...
Using already assembled WASM...
Publishing contract...
executed transaction: 41677b5fd5c701ca67a153abb09f79c04085cc51a9d021436e7ee5afda1781bd 8048 bytes 1212 us
# eosio <= eosio::setcode {"account":"eosio.token","vmtype":0,"vmversion":0,"code":"0061736d01000000017f1560037f7e7f0060057f7e...
# eosio <= eosio::setabi {"account":"eosio.token","abi":"0e656f73696f3a3a6162692f312e30010c6163636f756e745f6e616d65046e616d65...
Creating EOS tokens
cleos push action eosio.token create '["eosio", "10000000000.0000 EOS",0,0,0]' -p eosio.token
result:
executed transaction: 566693cba0b0d5d11d85e40cdfb095d525612c5915e17ce75d309054e1912235 120 bytes 552 us
# eosio.token <= eosio.token::create {"issuer":"eosio","maximum_supply":"10000000000.0000 EOS"}
Send coins to eosio
cleos push action eosio.token issue '["eosio","1000000000.0000 EOS", "issue"]' -p eosio
result:
executed transaction: 73f72879d220c720fcefb16b6aaf3db0ba492bd62020853b2cd5051557d5fa87 128 bytes 677 us
# eosio.token <= eosio.token::issue {"to":"eosio","quantity":"1000000000.0000 EOS","memo":"issue"}
Check balance
If the above operation were correct, you should be able to query the balance:
cleos get currency balance eosio.token eosio
result:
1000000000.0000 EOS
Deploying System Contracts
Deploy the eosio.system contract
cleos set contract eosio.token /opt/eosio/bin/data-dir/contracts/eosio.system -p eosio.token
result:
Reading WAST/WASM from /opt/eosio/bin/data-dir/contracts/eosio.system/eosio.system.wasm...
Using already assembled WASM...
Publishing contract...
executed transaction: f6fab6802bf8089b3ba48705f899e36fd681e58c622661ba2032eb1a85ee2d64 40440 bytes 8081 us
# eosio <= eosio::setcode "00a6823403ea30550000809d070061736d0100000001ba022f60027f7e0060067f7e7e7f7f7f0060057f7e7e7f7f0060047...
# eosio <= eosio::setabi "00a6823403ea3055a8250e656f73696f3a3a6162692f312e30050c6163636f756e745f6e616d65046e616d650f7065726d6...
RPC usage of transfer
abi_json_to_bin
First we need to serialize the json of the transfer:
POST http://127.0.0.1:8888/v1/chain/abi_json_to_bin
Data:
{
"code": "eosio.token",
"action": "transfer",
"args": {
"from": "eosio",
"to": "noprom",
"quantity": "1.0000 EOS",
"memo": "created by noprom"
}
}
The meaning of the parameters are:
| Parameter Name | Parameter Type | Description |
|---|---|---|
| code | string | The name of the smart contract, used here is eosio.token |
| action | string | action in a smart contract, with a transfer here: transfer |
| from | string | transfer method parameters, from which account transfer |
| to | string | transfer method parameters, transfer to which account |
| quantity | string | transfer method parameters, number of transfers, token name here is EOS, there may be other tokens |
| memo | string | transfer method parameters, transfer notes |
This will get a binary string that will be used as the data parameter in the following steps:
{
"binargs": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
}
| Parameter Name | Parameter Type | Description |
|---|---|---|
| binargs | string | Serialized results as data request parameters in sign_transaction and push_transaction |
get_info
We use get_info to get the latest block number:
GET http://127.0.0.1:8888/v1/chain/get_info
| Parameter Name | Parameter Type | Description |
|---|---|---|
| head_block_num | number | latest block number |
Got the result:
{
"server_version": "4e99cf47",
"head_block_num": 246190,
"last_irreversible_block_num": 246189,
"last_irreversible_block_id": "0003c1ade32d4660e7872abaedb9413d7de2eefea63dd17eea6bd36dc3c11ac4",
"head_block_id": "0003c1ae3018e5cb2bda7c6897b418e60eaf8d1a00622d731d7337c264dca453",
"head_block_time": "2018-05-24T14:39:32",
"head_block_producer": "eosio",
"virtual_block_cpu_limit": 100000000,
"virtual_block_net_limit": 1048576000,
"block_cpu_limit": 99900,
"block_net_limit": 1048576
}
get_block
Use get_block to get the latest block specific information:
POST http://127.0.0.1:8888/v1/chain/get_block
DATA:
{"block_num_or_id":246190}
Request parameters:
| Parameter Name | Parameter Type | Description |
|---|---|---|
| Block_num_or_id | number | block number |
Got the result:
{
"timestamp": "2018-05-24T14:39:32.000",
"producer": "eosio",
"confirmed": 0,
"previous": "0003c1ade32d4660e7872abaedb9413d7de2eefea63dd17eea6bd36dc3c11ac4",
"transaction_mroot": "0000000000000000000000000000000000000000000000000000000000000000",
"action_mroot": "953a01dbf975cc120285e0c4e9fbe4be181189a821de7f2da467bcb373dce8f2",
"schedule_version": 0,
"new_producers": null,
"header_extensions": [],
"producer_signature": "SIG_K1_JvQ5qzgSJ4L1jYYZH2L7oM7D7hp37ejENN8UQL9AvnKpNvbCeF8gAzAKXUYvocH9fEUg2bxKGbU66QGRCjVGzxEXN7HTL6",
"transactions": [],
"block_extensions": [],
"id": "0003c1ae3018e5cb2bda7c6897b418e60eaf8d1a00622d731d7337c264dca453",
"block_num": 246190,
"ref_block_prefix": 1753012779
}
The meaning of the parameters:
| Parameter Name | Parameter Type | Description |
|---|---|---|
| Timestamp | string | Timestamp of the block |
| Block_num | number | block number as the ref_block_num request parameter in sign_transaction and push_transaction |
| ref_block_prefix | number | as ref_block_prefix request parameters in sign_transaction and push_transaction |
unlock
To unlock the wallet before signing the transaction:
POST http://127.0.0.1:8888/v1/wallet/unlock
Data:
["noprom", "PW5KExxxxxS1HQzF1qJtWbxxxEFqSxdWBpgYUsxxxxxoxVRmjVw7Y"]
Get the result, if it is empty return the following result:
{}
get_required_keys
We need to use this interface to get the required key
POST http://127.0.0.1:8888/v1/chain/get_required_keys
DATA:
{
"available_keys": [
"EOS5ySgzeHp9G7TqNDGpyzaCtahAeRcTvPRPJbFey5CmySL3vKYgE",
"EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV",
"EOS6gXwNz2SKUNAZcyjzVvg6KdNgA1bSuVzCr8c5yWkGij52JKx8V"
],
"transaction": {
"actions": [
{
"account": "eosio.token",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d",
"name": "transfer"
}
],
"context_free_actions": [
],
"context_free_data": [
],
"delay_sec": 0,
"expiration": "2018-05-24T15:20:30.500",
"max_kcpu_usage": 0,
"max_net_usage_words": 0,
"ref_block_num": 245107,
"ref_block_prefix": 801303063,
"signatures": [
]
}
}
Got the result:
{
"required_keys": [
"EOS6gXwNz2SKUNAZcyjzVvg6KdNgA1bSuVzCr8c5yWkGij52JKx8V"
]
}
The key in the result will be the key to sign_transaction
sign_transaction
Then we need to sign the transfer transaction:
POST http://127.0.0.1:8888/v1/wallet/sign_transaction
Data:
[
{
"ref_block_num": 246190,
"ref_block_prefix": 1753012779,
"expiration": "2018-05-24T15:30:32.000",
"actions": [
{
"account": "eosio.token",
"name": "transfer",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
}
],
"signatures": []
},
[
"EOS6gXwNz2SKUNAZcyjzVvg6KdNgA1bSuVzCr8c5yWkGij52JKx8V"
],
""
]
The meaning of the parameters:
| Parameter Name | Parameter Type | Description |
|---|---|---|
| ref_block_num | number | Latest block number obtained by get_block |
| ref_block_prefix | number | get_block Get the latest block number information |
| expiration | string | expiration time = timestamp plus time, eg 1 minute |
| Account | string | Call system smart contract account name, here is eosio.token |
| name | string | transfer method of eosio.token contract |
| Authorization. actor | string | user name to perform the operation |
| authorization. permission | string | permission to perform operations |
| data | string | abi_json_to_bin Serialized Values binargs |
| string | creator's public key |
Got the result:
{
"expiration": "2018-05-24T15:30:32",
"ref_block_num": 49582,
"ref_block_prefix": 1753012779,
"max_net_usage_words": 0,
"max_cpu_usage_ms": 0,
"delay_sec": 0,
"context_free_actions": [],
"actions": [
{
"account": "eosio.token",
"name": "transfer",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
}
],
"transaction_extensions": [],
"signatures": [
"SIG_K1_Khn918pY1NHmnbF41bsqFE7sPYrniZPtTns68qUo3m92jp6gbegkpRHYSp9RH95T3u82XUvjZLM33AP83ZqiGApBo7JnBF"
],
"context_free_data": []
}
push_transaction
The last is to send the transaction:
POST http://127.0.0.1:8888/v1/chain/push_transaction
Data:
{
"compression": "none",
"transaction": {
"expiration": "2018-05-24T15:30:32",
"ref_block_num": 49582,
"ref_block_prefix": 1753012779,
"context_free_actions": [],
"actions": [
{
"account": "eosio.token",
"name": "transfer",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
}
],
"transaction_extensions": []
},
"signatures": [
"SIG_K1_Khn918pY1NHmnbF41bsqFE7sPYrniZPtTns68qUo3m92jp6gbegkpRHYSp9RH95T3u82XUvjZLM33AP83ZqiGApBo7JnBF"
]
}
The meaning of the parameters:
| Parameter Name | Parameter Type | Description |
|---|---|---|
| ref_block_num | number | Latest block number obtained by get_block |
| ref_block_prefix | number | get_block Get the latest block number information |
| expiration | string | expiration time = timestamp plus time, eg 1 minute |
| account | string | Call system smart contract account name, here is eosio.token |
| name | string | transfer method of eosio.token contract |
| authorization. actor | string | user name to perform the operation |
| authorization. permission | string | permission to perform operations |
| signatures | string | sign_transaction Signed |
Got the result:
{
"transaction_id": "015ba92c7ad7294f0d70c772e7ba6ed678b11734418bf9ec48b001ce65c48e2f",
"processed": {
"id": "015ba92c7ad7294f0d70c772e7ba6ed678b11734418bf9ec48b001ce65c48e2f",
"receipt": {
"status": "executed",
"cpu_usage_us": 644,
"net_usage_words": 18
},
"elapsed": 644,
"net_usage": 144,
"scheduled": false,
"action_traces": [
{
"receipt": {
"receiver": "eosio.token",
"act_digest": "77d11fbbb7e6a5d67c28c2578bc2042704ed76d494d7e426eaecb54dceb0dc0b",
"global_sequence": 246506,
"recv_sequence": 12,
"auth_sequence": [
[
"eosio",
246499
]
],
"code_sequence": 1,
"abi_sequence": 1
},
"act": {
"account": "eosio.token",
"name": "transfer",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": {
"from": "eosio",
"to": "noprom",
"quantity": "1.0000 EOS",
"memo": "created by noprom"
},
"hex_data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
},
"elapsed": 446,
"cpu_usage": 0,
"console": "",
"total_cpu_usage": 0,
"trx_id": "015ba92c7ad7294f0d70c772e7ba6ed678b11734418bf9ec48b001ce65c48e2f",
"inline_traces": [
{
"receipt": {
"receiver": "eosio",
"act_digest": "77d11fbbb7e6a5d67c28c2578bc2042704ed76d494d7e426eaecb54dceb0dc0b",
"global_sequence": 246507,
"recv_sequence": 246488,
"auth_sequence": [
[
"eosio",
246500
]
],
"code_sequence": 1,
"abi_sequence": 1
},
"act": {
"account": "eosio.token",
"name": "transfer",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": {
"from": "eosio",
"to": "noprom",
"quantity": "1.0000 EOS",
"memo": "created by noprom"
},
"hex_data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
},
"elapsed": 3,
"cpu_usage": 0,
"console": "",
"total_cpu_usage": 0,
"trx_id": "015ba92c7ad7294f0d70c772e7ba6ed678b11734418bf9ec48b001ce65c48e2f",
"inline_traces": []
},
{
"receipt": {
"receiver": "noprom",
"act_digest": "77d11fbbb7e6a5d67c28c2578bc2042704ed76d494d7e426eaecb54dceb0dc0b",
"global_sequence": 246508,
"recv_sequence": 7,
"auth_sequence": [
[
"eosio",
246501
]
],
"code_sequence": 1,
"abi_sequence": 1
},
"act": {
"account": "eosio.token",
"name": "transfer",
"authorization": [
{
"actor": "eosio",
"permission": "active"
}
],
"data": {
"from": "eosio",
"to": "noprom",
"quantity": "1.0000 EOS",
"memo": "created by noprom"
},
"hex_data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
},
"elapsed": 4,
"cpu_usage": 0,
"console": "",
"total_cpu_usage": 0,
"trx_id": "015ba92c7ad7294f0d70c772e7ba6ed678b11734418bf9ec48b001ce65c48e2f",
"inline_traces": []
}
]
}
],
"except": null
}
}
This completes the function of transferring funds using the RPC API.
Github
This article is on GitHub now: Transfer-Tokens-Using-RPC
About US
This article is written by @EOSpace, the Leading EOS Block Producer Candidate from China.
We will publish more tutorials. If you want to learn more about EOS development related technologies, please join our telegram group: EOSpace