Hive Developer Portal
Resource Credit System Developer Guide
The goal of this guide is to demystify how resources and RC’s work. The intended audience is developers working on Hive user interfaces, applications, and client libraries.
Full, runnable src of Power Up Hive can be downloaded as part of: tutorials/python (or download just this tutorial: devportal-master-tutorials-python-36_rcdemo.zip).
Statelessness
First of all, a word about statelessness. A great deal of effort has gone into carefully separating stateful from stateless computations. The reason for this is so that UI’s and client libraries can execute stateless algorithms locally. Local computation is always to be preferred to RPC-API for performance, stability, scalability and security.
Unfortunately, client library support for RC algorithms is lacking. This tutorial, and its accompanying script, are intended to provide guidance to UI and client library maintainers about how to add support for the RC system.
Also see:
The RC demo script
To get up and running, I (theoretical
) have transcribed some key algorithms from C++ to Python. For example, how many resources
are consumed by a vote transaction? The rcdemo
script allows us to find out:
>>> from rcdemo import *
>>> count = count_resources(vote_tx, vote_tx_size)
>>> count["resource_state_bytes"]
499232
>>> print(json.dumps(count))
{"resource_count": {"resource_history_bytes": 133, "resource_new_accounts": 0, "resource_market_bytes": 0, "resource_state_bytes": 499232, "resource_execution_time": 0}}
The count_resources()
function is stateless. That means all of the information needed to do the calculation is contained in the transaction itself. It doesn’t
depend on what’s happening on the blockchain, or what other users are doing. [1] [2] [3]
[1] Although it is possible that the calculation will change in future versions of hived
, for example to correct the bug where execution time is always reported as zero.
[2] For convenience, some of the constants used in the calculation are exposed by the size_info
member of rc_api.get_resource_params()
. Only a hived
version upgrade can change any values returned by rc_api.get_resource_params()
, so it is probably okay to query that API once, on startup or when first needed, and then cache the result forever. Or even embed the result of rc_api.get_resource_params()
in the source code of your library or application.
[3] rcdemo.py
requires you to also input the transaction size into count_resources()
. This is because rcdemo.py
was created to be a standalone script, without a dependence on any particular client library. If you are integrating rcdemo.py
into a client library, you might consider using your library’s serializer to calculate the transaction size automatically, so the caller of count_resources()
doesn’t have to specify it.
Resources
Let’s go into details on the different kinds of resources which are limited by the RC system.
resource_history_bytes
: Number of bytes consumed by the transaction.resource_new_accounts
: Number of accounts created by the transaction.resource_market_bytes
: Number of bytes consumed by the transaction if it contains market operations.resource_state_bytes
: Number of bytes of chain state needed to support the transaction.resource_execution_time
: An estimate of how long the transaction will take to execute. Zero for now due to #2972.
The resources have different scales. The resources use fixed-point arithmetic where one “tick” of the resource value is a “fractional” value of the resource. Right now, the resource scales are scattered in different places. The count_resources()
result has the following scale:
resource_history_bytes
: One byte is equal to1
.resource_new_accounts
: One account is equal to1
.resource_market_bytes
: One byte is equal to1
.resource_state_bytes
: One byte which must be stored forever is equal to thehived
compile-time constantSTATE_BYTES_SCALE
, which is10000
. Bytes which must be stored for a bounded amount of time are worth less than10000
, depending on how long they need to be stored. The specific constants used in various cases are specified in theresource_params["size_info"]["resource_state_bytes"]
fields.resource_execution_time
: One nanosecond of CPU time is equal to1
. The values are based on benchmark measurements made on a machine similar tohive.blog
servers. Some rounding was performed, and a few operations’ timings were adjusted to account for additional processing of the virtual operations they cause.
Resource pool levels
Each resource has a global pool which is the number of resources remaining. The pool code supports fractional resources, the denominator is represented by the resource_unit
parameter. So for example, since resource_params["resource_params"]["resource_market_bytes"]["resource_dynamics_params"]["resource_unit"]
is 10
, a pool level of 15,000,000,000
actually represents 1,500,000,000
bytes.
Resource credits
The RC cost of each resource depends on the following information:
- How many resources are in the corresponding resource pool
- The global RC regeneration rate, which may be calculated as
total_vesting_shares
/ (HIVE_RC_REGEN_TIME
/HIVE_BLOCK_INTERVAL
)` - The price curve parameters in the corresponding
price_curve_params
object
For convenience, rcdemo.py
contains an RCModel
class with all of this information in its fields.
>>> print(json.dumps(model.get_transaction_rc_cost( vote_tx, vote_tx_size )))
{"usage": {"resource_count": {"resource_history_bytes": 133, "resource_new_accounts": 0, "resource_market_bytes": 0, "resource_state_bytes": 499232, "resource_execution_time": 0}}, "cost": {"resource_history_bytes": 42136181, "resource_new_accounts": 0, "resource_market_bytes": 0, "resource_state_bytes": 238436287, "resource_execution_time": 0}}
>>> sum(model.get_transaction_rc_cost( vote_tx, vote_tx_size )["cost"].values())
280572468
The model
object created in rcdemo.py
is an instance of RCModel
which uses hardcoded values for its pool levels and global RC regeneration rate. These values were taken from the live network and hardcoded in the rcdemo.py
source code in late September 2018. So the RC cost calculation provided out-of-the-box by rcdemo.py
are approximately correct as of late September 2018, but will become inaccurate as the “live” values drift away from the hardcoded values. When integrating the rcdemo.py
code into an application, client library, or another situation where RPC access is feasible, you should understand how your code will query a hived
RPC endpoint for current values. (Some libraries will probably choose to do this RPC automagically, other libraries may want to leave this plumbing to user code.)
Transaction limits
Suppose an account has 15 Hive Power. How much can it vote?
>>> vote_cost = sum(model.get_transaction_rc_cost( vote_tx, vote_tx_size )["cost"].values())
>>> vote_cost
280572468
>>> vote_cost * total_vesting_fund_hive / total_vesting_shares
138.88697555075086
This is the amount of Hive Power (in satoshis) that would be needed by an account to transact once per 5 days (HIVE_RC_REGEN_TIME
).
Our 15 HP account has 15000 HP, so it would be able to do 15000 / 138
, or about 108
, such transactions per 5 days.
You can regard the number 138
(or 0.138
) as the “cost” of a “standardized” vote transaction. It plays an analogous role to a
transaction fee in Bitcoin, but it is not exactly a fee. Because the word “fee” implies giving up a permanent token with a limited,
controlled emission rate. It is the amount of HP which will allow a user an additional vote transaction every 5 days (but it might
be slightly more or less, if your vote transactions use a slightly different amount of resources.)
Integrating the demo script
The rcdemo.py
script is a standalone Python script with no dependencies, no network access, and no transaction serializer. It is a port
of the algorithms, and a few example transactions for demo purposes.
Eventually, client library maintainers should integrate rcdemo.py
or equivalent functionality into each Hive client library. Such integration
depends on the idioms and conventions of each particular client library, for example:
- A client library with a minimalist, “explicit is better than implicit” philosophy may simply rename
rcdemo
, delete the example code, add a tiny bit of glue code, and give it to clients largely as-is. - A client library with an automagic, “invisible RPC” philosophy might provide a transaction may make substantial modifications to
rcdemo
or expose an interface likeget_rc_cost(tx)
which would conveniently return the RC cost of a transaction. Since the RC cost depends on chain state, thisget_rc_cost()
function would callhived
RPC’s (or use cached values) to get additional inputs needed by stateless algorithms, such as resource pools,total_vesting_shares
, etc. - A client library which has a general policy of hard-coding constants from the
hived
C++ source code might distributerc_api.get_resource_parameters()
as part of its source code, asrc_api.get_resource_parameters()
results can only change in a new version ofhived
. (Perhaps this kind of thing is somehow automated in the library’s build scripts.) - A client library whose maintainers don’t want to be obligated to make new releases when values in
hived
change as part of a new release, might instead choose to callrc_api.get_resource_parameters()
. Adding extra performance and security overhead in exchange for the convenience of askinghived
to report these values. - A client library with its own
Transaction
class might choose to implement class methods instead of standalone functions. - A client library in JavaScript, Ruby or Go might transcribe the algorithms in
rcdemo.py
into a different language.
As you can see, integrating support for the RC system into a Hive client library involves a number of architectural and technical decisions.
Final code:
#!/usr/bin/env python3
import collections
class CountOperationVisitor(object):
def __init__(self, size_info, exec_info):
self.market_op_count = 0
self.new_account_op_count = 0
self.state_bytes_count = 0
self.execution_time_count = 0
self.size_info = size_info
self.exec_info = exec_info
def get_authority_byte_count( self, auth ):
return (self.size_info.authority_base_size
+ self.size_info.authority_account_member_size * len(auth["account_auths"])
+ self.size_info.authority_key_member_size * len(auth["key_auths"])
)
def visit_account_create_operation( self, op ):
self.state_bytes_count += (
self.size_info.account_object_base_size
+ self.size_info.account_authority_object_base_size
+ self.get_authority_byte_count( op["owner"] )
+ self.get_authority_byte_count( op["active"] )
+ self.get_authority_byte_count( op["posting"] )
)
self.execution_time_count += self.exec_info.account_create_operation_exec_time
def visit_account_create_with_delegation_operation( self, op ):
self.state_bytes_count += (
self.size_info.account_object_base_size
+ self.size_info.account_authority_object_base_size
+ self.get_authority_byte_count( op["owner"] )
+ self.get_authority_byte_count( op["active"] )
+ self.get_authority_byte_count( op["posting"] )
+ self.size_info.vesting_delegation_object_base_size
)
self.execution_time_count += self.exec_info.account_create_with_delegation_operation_exec_time
def visit_account_witness_vote_operation( self, op ):
self.state_bytes_count += self.size_info.witness_vote_object_base_size
self.execution_time_count += self.exec_info.account_witness_vote_operation_exec_time
def visit_comment_operation( self, op ):
self.state_bytes_count += (
self.size_info.comment_object_base_size
+ self.size_info.comment_object_permlink_char_size * len(op["permlink"].encode("utf8"))
+ self.size_info.comment_object_parent_permlink_char_size * len(op["parent_permlink"].encode("utf8"))
)
self.execution_time_count += self.exec_info.comment_operation_exec_time
def visit_comment_payout_beneficiaries( self, bens ):
self.state_bytes_count += self.size_info.comment_object_beneficiaries_member_size * len(bens["beneficiaries"])
def visit_comment_options_operation( self, op ):
for e in op["extensions"]:
getattr(self, "visit_"+e["type"])(e["value"])
self.execution_time_count += self.exec_info.comment_options_operation_exec_time
def visit_convert_operation( self, op ):
self.state_bytes_count += self.size_info.convert_request_object_base_size
self.execution_time_count += self.exec_info.convert_operation_exec_time
def visit_create_claimed_account_operation( self, op ):
self.state_bytes_count += (
self.size_info.account_object_base_size
+ self.size_info.account_authority_object_base_size
+ self.get_authority_byte_count( op["owner"] )
+ self.get_authority_byte_count( op["active"] )
+ self.get_authority_byte_count( op["posting"] )
)
self.execution_time_count += self.exec_info.create_claimed_account_operation_exec_time
def visit_decline_voting_rights_operation( self, op ):
self.state_bytes_count += self.size_info.decline_voting_rights_request_object_base_size
self.execution_time_count += self.exec_info.decline_voting_rights_operation_exec_time
def visit_delegate_vesting_shares_operation( self, op ):
self.state_bytes_count += max(
self.size_info.vesting_delegation_object_base_size,
self.size_info.vesting_delegation_expiration_object_base_size
)
self.execution_time_count += self.exec_info.delegate_vesting_shares_operation_exec_time
def visit_escrow_transfer_operation( self, op ):
self.state_bytes_count += self.size_info.escrow_object_base_size
self.execution_time_count += self.exec_info.escrow_transfer_operation_exec_time
def visit_limit_order_create_operation( self, op ):
self.state_bytes_count += 0 if op["fill_or_kill"] else self.size_info.limit_order_object_base_size
self.execution_time_count += self.exec_info.limit_order_create_operation_exec_time
self.market_op_count += 1
def visit_limit_order_create2_operation( self, op ):
self.state_bytes_count += 0 if op["fill_or_kill"] else self.size_info.limit_order_object_base_size
self.execution_time_count += self.exec_info.limit_order_create2_operation_exec_time
self.market_op_count += 1
def visit_request_account_recovery_operation( self, op ):
self.state_bytes_count += self.size_info.account_recovery_request_object_base_size
self.execution_time_count += self.exec_info.request_account_recovery_operation_exec_time
def visit_set_withdraw_vesting_route_operation( self, op ):
self.state_bytes_count += self.size_info.withdraw_vesting_route_object_base_size
self.execution_time_count += self.exec_info.set_withdraw_vesting_route_operation_exec_time
def visit_vote_operation( self, op ):
self.state_bytes_count += self.size_info.comment_vote_object_base_size
self.execution_time_count += self.exec_info.vote_operation_exec_time
def visit_witness_update_operation( self, op ):
self.state_bytes_count += (
self.size_info.witness_object_base_size
+ self.size_info.witness_object_url_char_size * len(op["url"].encode("utf8"))
)
self.execution_time_count += self.exec_info.witness_update_operation_exec_time
def visit_transfer_operation( self, op ):
self.execution_time_count += self.exec_info.transfer_operation_exec_time
self.market_op_count += 1
def visit_transfer_to_vesting_operation( self, op ):
self.execution_time_count += self.exec_info.transfer_to_vesting_operation_exec_time
self.market_op_count += 1
def visit_transfer_to_savings_operation( self, op ):
self.execution_time_count += self.exec_info.transfer_to_savings_operation_exec_time
def visit_transfer_from_savings_operation( self, op ):
self.state_bytes_count += self.size_info.savings_withdraw_object_byte_size
self.execution_time_count += self.exec_info.transfer_from_savings_operation_exec_time
def visit_claim_reward_balance_operation( self, op ):
self.execution_time_count += self.exec_info.claim_reward_balance_operation_exec_time
def visit_withdraw_vesting_operation( self, op ):
self.execution_time_count += self.exec_info.withdraw_vesting_operation_exec_time
def visit_account_update_operation( self, op ):
self.execution_time_count += self.exec_info.account_update_operation_exec_time
def visit_account_witness_proxy_operation( self, op ):
self.execution_time_count += self.exec_info.account_witness_proxy_operation_exec_time
def visit_cancel_transfer_from_savings_operation( self, op ):
self.execution_time_count += self.exec_info.cancel_transfer_from_savings_operation_exec_time
def visit_change_recovery_account_operation( self, op ):
self.execution_time_count += self.exec_info.change_recovery_account_operation_exec_time
def visit_claim_account_operation( self, op ):
self.execution_time_count += self.exec_info.claim_account_operation_exec_time
if int(op["fee"]["amount"]) == 0:
self.new_account_op_count += 1
def visit_custom_operation( self, op ):
self.execution_time_count += self.exec_info.custom_operation_exec_time
def visit_custom_json_operation( self, op ):
self.execution_time_count += self.exec_info.custom_json_operation_exec_time
def visit_custom_binary_operation( self, op ):
self.execution_time_count += self.exec_info.custom_binary_operation_exec_time
def visit_delete_comment_operation( self, op ):
self.execution_time_count += self.exec_info.delete_comment_operation_exec_time
def visit_escrow_approve_operation( self, op ):
self.execution_time_count += self.exec_info.escrow_approve_operation_exec_time
def visit_escrow_dispute_operation( self, op ):
self.execution_time_count += self.exec_info.escrow_dispute_operation_exec_time
def visit_escrow_release_operation( self, op ):
self.execution_time_count += self.exec_info.escrow_release_operation_exec_time
def visit_feed_publish_operation( self, op ):
self.execution_time_count += self.exec_info.feed_publish_operation_exec_time
def visit_limit_order_cancel_operation( self, op ):
self.execution_time_count += self.exec_info.limit_order_cancel_operation_exec_time
def visit_witness_set_properties_operation( self, op ):
self.execution_time_count += self.exec_info.witness_set_properties_operation_exec_time
def visit_claim_reward_balance2_operation( self, op ):
self.execution_time_count += self.exec_info.claim_reward_balance2_operation_exec_time
def visit_smt_setup_operation( self, op ):
self.execution_time_count += self.exec_info.smt_setup_operation_exec_time
def visit_smt_cap_reveal_operation( self, op ):
self.execution_time_count += self.exec_info.smt_cap_reveal_operation_exec_time
def visit_smt_refund_operation( self, op ):
self.execution_time_count += self.exec_info.smt_refund_operation_exec_time
def visit_smt_setup_emissions_operation( self, op ):
self.execution_time_count += self.exec_info.smt_setup_emissions_operation_exec_time
def visit_smt_set_setup_parameters_operation( self, op ):
self.execution_time_count += self.exec_info.smt_set_setup_parameters_operation_exec_time
def visit_smt_set_runtime_parameters_operation( self, op ):
self.execution_time_count += self.exec_info.smt_set_runtime_parameters_operation_exec_time
def visit_smt_create_operation( self, op ):
self.execution_time_count += self.exec_info.smt_create_operation_exec_time
def visit_allowed_vote_assets( self, op ):
pass
def visit_recover_account_operation( self, op ): pass
def visit_pow_operation( self, op ): pass
def visit_pow2_operation( self, op ): pass
def visit_report_over_production_operation( self, op ): pass
def visit_reset_account_operation( self, op ): pass
def visit_set_reset_account_operation( self, op ): pass
# Virtual ops
def visit_fill_convert_request_operation( self, op ): pass
def visit_author_reward_operation( self, op ): pass
def visit_curation_reward_operation( self, op ): pass
def visit_comment_reward_operation( self, op ): pass
def visit_liquidity_reward_operation( self, op ): pass
def visit_interest_operation( self, op ): pass
def visit_fill_vesting_withdraw_operation( self, op ): pass
def visit_fill_order_operation( self, op ): pass
def visit_shutdown_witness_operation( self, op ): pass
def visit_fill_transfer_from_savings_operation( self, op ): pass
def visit_hardfork_operation( self, op ): pass
def visit_comment_payout_update_operation( self, op ): pass
def visit_return_vesting_delegation_operation( self, op ): pass
def visit_comment_benefactor_reward_operation( self, op ): pass
def visit_producer_reward_operation( self, op ): pass
def visit_clear_null_account_balance_operation( self, op ): pass
class SizeInfo(object):
pass
class ExecInfo(object):
pass
class ResourceCounter(object):
def __init__(self, resource_params):
self.resource_params = resource_params
self.resource_name_to_index = {}
self._size_info = None
self._exec_info = None
self.resource_names = self.resource_params["resource_names"]
self.STEEM_NUM_RESOURCE_TYPES = len(self.resource_names)
for i, resource_name in enumerate(self.resource_names):
self.resource_name_to_index[ resource_name ] = i
self._size_info = SizeInfo()
for k, v in self.resource_params["size_info"]["resource_state_bytes"].items():
setattr(self._size_info, k, v)
self._exec_info = ExecInfo()
for k, v in self.resource_params["size_info"]["resource_execution_time"].items():
setattr(self._exec_info, k, v)
return
def __call__( self, tx=None, tx_size=-1 ):
if tx_size < 0:
ser = Serializer()
ser.signed_transaction(tx)
tx_size = len(ser.flush())
result = collections.OrderedDict(
(("resource_count", collections.OrderedDict((
("resource_history_bytes", 0),
("resource_new_accounts", 0),
("resource_market_bytes", 0),
("resource_state_bytes", 0),
("resource_execution_time", 0),
))),)
)
resource_count = result["resource_count"]
resource_count["resource_history_bytes"] += tx_size
vtor = CountOperationVisitor(self._size_info, self._exec_info)
for op in tx["operations"]:
getattr(vtor, "visit_"+op["type"])(op["value"])
resource_count["resource_new_accounts"] += vtor.new_account_op_count
if vtor.market_op_count > 0:
resource_count["resource_market_bytes"] += tx_size
resource_count["resource_state_bytes"] += (
self._size_info.transaction_object_base_size
+ self._size_info.transaction_object_byte_size * tx_size
+ vtor.state_bytes_count )
# resource_count["resource_execution_time"] += vtor.execution_time_count
return result
def compute_rc_cost_of_resource( curve_params=None, current_pool=0, resource_count=0, rc_regen=0 ):
if resource_count <= 0:
if resource_count < 0:
return -compute_rc_cost_of_resource( curve_params, current_pool, -resource_count, rc_regen )
return 0
num = rc_regen
num *= int(curve_params["coeff_a"])
num >>= int(curve_params["shift"])
num += 1
num *= resource_count
denom = int(curve_params["coeff_b"])
denom += max(current_pool, 0)
num_denom = num // denom
return num_denom+1
def rd_compute_pool_decay(
decay_params,
current_pool,
dt,
):
if current_pool < 0:
return -rd_compute_pool_decay( decay_params, -current_pool, dt )
decay_amount = int(decay_params["decay_per_time_unit"]) * dt
decay_amount *= current_pool
decay_amount >>= int(decay_params["decay_per_time_unit_denom_shift"])
result = decay_amount
return min(result, current_pool)
class RCModel(object):
def __init__(self, resource_params=None, resource_pool=None, rc_regen=0 ):
self.resource_params = resource_params
self.resource_pool = resource_pool
self.rc_regen = rc_regen
self.count_resources = ResourceCounter(resource_params)
self.resource_names = self.resource_params["resource_names"]
def get_transaction_rc_cost(self, tx=None, tx_size=-1):
usage = self.count_resources( tx, tx_size )
total_cost = 0
cost = collections.OrderedDict()
for resource_name in self.resource_params["resource_names"]:
params = self.resource_params["resource_params"][resource_name]
pool = int(self.resource_pool[resource_name]["pool"])
usage["resource_count"][resource_name] *= params["resource_dynamics_params"]["resource_unit"]
cost[resource_name] = compute_rc_cost_of_resource( params["price_curve_params"], pool, usage["resource_count"][resource_name], self.rc_regen)
total_cost += cost[resource_name]
# TODO: Port get_resource_user()
return collections.OrderedDict( (("usage", usage), ("cost", cost)) )
def apply_rc_pool_dynamics(self, count):
block_info = collections.OrderedDict((
("dt", collections.OrderedDict()),
("decay", collections.OrderedDict()),
("budget", collections.OrderedDict()),
("usage", collections.OrderedDict()),
("adjustment", collections.OrderedDict()),
("pool", collections.OrderedDict()),
("new_pool", collections.OrderedDict()),
))
for resource_name in self.resource_params["resource_names"]:
params = self.resource_params["resource_params"][resource_name]["resource_dynamics_params"]
pool = int(self.resource_pool[resource_name]["pool"])
dt = 1
block_info["pool"][resource_name] = pool
block_info["dt"][resource_name] = dt
block_info["budget"][resource_name] = int(params["budget_per_time_unit"]) * dt
block_info["usage"][resource_name] = count[resource_name] * params["resource_unit"]
block_info["decay"][resource_name] = rd_compute_pool_decay( params["decay_params"], pool - block_info["usage"][resource_name], dt )
block_info["new_pool"][resource_name] = pool - block_info["decay"][resource_name] + block_info["budget"][resource_name] - block_info["usage"][resource_name]
return block_info
# These are constants #define in the code
STEEM_RC_REGEN_TIME = 60*60*24*5
STEEM_BLOCK_INTERVAL = 3
# This is the result of rc_api.get_resource_params()
resource_params = {
"resource_names": [
"resource_history_bytes",
"resource_new_accounts",
"resource_market_bytes",
"resource_state_bytes",
"resource_execution_time"
],
"resource_params": {
"resource_history_bytes": {
"resource_dynamics_params": {
"resource_unit": 1,
"budget_per_time_unit": 347222,
"pool_eq": "216404314004",
"max_pool_size": "432808628007",
"decay_params": {
"decay_per_time_unit": 3613026481,
"decay_per_time_unit_denom_shift": 51
},
"min_decay": 0
},
"price_curve_params": {
"coeff_a": "12981647055416481792",
"coeff_b": 1690658703,
"shift": 49
}
},
"resource_new_accounts": {
"resource_dynamics_params": {
"resource_unit": 10000,
"budget_per_time_unit": 797,
"pool_eq": 157691079,
"max_pool_size": 157691079,
"decay_params": {
"decay_per_time_unit": 347321,
"decay_per_time_unit_denom_shift": 36
},
"min_decay": 0
},
"price_curve_params": {
"coeff_a": "16484671763857882971",
"coeff_b": 1231961,
"shift": 51
}
},
"resource_market_bytes": {
"resource_dynamics_params": {
"resource_unit": 10,
"budget_per_time_unit": 578704,
"pool_eq": "16030041350",
"max_pool_size": "32060082699",
"decay_params": {
"decay_per_time_unit": 2540365427,
"decay_per_time_unit_denom_shift": 46
},
"min_decay": 0
},
"price_curve_params": {
"coeff_a": "9231393461629499392",
"coeff_b": 125234698,
"shift": 53
}
},
"resource_state_bytes": {
"resource_dynamics_params": {
"resource_unit": 1,
"budget_per_time_unit": 231481481,
"pool_eq": "144269542669147",
"max_pool_size": "288539085338293",
"decay_params": {
"decay_per_time_unit": 3613026481,
"decay_per_time_unit_denom_shift": 51
},
"min_decay": 0
},
"price_curve_params": {
"coeff_a": "12981647055416481792",
"coeff_b": "1127105802103",
"shift": 49
}
},
"resource_execution_time": {
"resource_dynamics_params": {
"resource_unit": 1,
"budget_per_time_unit": 82191781,
"pool_eq": "51225569123068",
"max_pool_size": "102451138246135",
"decay_params": {
"decay_per_time_unit": 3613026481,
"decay_per_time_unit_denom_shift": 51
},
"min_decay": 0
},
"price_curve_params": {
"coeff_a": "12981647055416481792",
"coeff_b": "400199758774",
"shift": 49
}
}
},
"size_info": {
"resource_state_bytes": {
"authority_base_size": 40000,
"authority_account_member_size": 180000,
"authority_key_member_size": 350000,
"account_object_base_size": 4800000,
"account_authority_object_base_size": 400000,
"account_recovery_request_object_base_size": 320000,
"comment_object_base_size": 2010000,
"comment_object_permlink_char_size": 10000,
"comment_object_parent_permlink_char_size": 20000,
"comment_object_beneficiaries_member_size": 180000,
"comment_vote_object_base_size": 470000,
"convert_request_object_base_size": 480000,
"decline_voting_rights_request_object_base_size": 280000,
"escrow_object_base_size": 1190000,
"limit_order_object_base_size": 147440,
"savings_withdraw_object_byte_size": 14656,
"transaction_object_base_size": 6090,
"transaction_object_byte_size": 174,
"vesting_delegation_object_base_size": 600000,
"vesting_delegation_expiration_object_base_size": 440000,
"withdraw_vesting_route_object_base_size": 430000,
"witness_object_base_size": 2660000,
"witness_object_url_char_size": 10000,
"witness_vote_object_base_size": 400000,
"STATE_BYTES_SCALE": 10000
},
"resource_execution_time": {
"account_create_operation_exec_time": 57700,
"account_create_with_delegation_operation_exec_time": 57700,
"account_update_operation_exec_time": 14000,
"account_witness_proxy_operation_exec_time": 117000,
"account_witness_vote_operation_exec_time": 23000,
"cancel_transfer_from_savings_operation_exec_time": 11500,
"change_recovery_account_operation_exec_time": 12000,
"claim_account_operation_exec_time": 10000,
"claim_reward_balance_operation_exec_time": 50300,
"comment_operation_exec_time": 114100,
"comment_options_operation_exec_time": 13200,
"convert_operation_exec_time": 15700,
"create_claimed_account_operation_exec_time": 57700,
"custom_operation_exec_time": 228000,
"custom_json_operation_exec_time": 228000,
"custom_binary_operation_exec_time": 228000,
"decline_voting_rights_operation_exec_time": 5300,
"delegate_vesting_shares_operation_exec_time": 19900,
"delete_comment_operation_exec_time": 51100,
"escrow_approve_operation_exec_time": 9900,
"escrow_dispute_operation_exec_time": 11500,
"escrow_release_operation_exec_time": 17200,
"escrow_transfer_operation_exec_time": 19100,
"feed_publish_operation_exec_time": 6200,
"limit_order_cancel_operation_exec_time": 9600,
"limit_order_create_operation_exec_time": 31700,
"limit_order_create2_operation_exec_time": 31700,
"request_account_recovery_operation_exec_time": 54400,
"set_withdraw_vesting_route_operation_exec_time": 17900,
"transfer_from_savings_operation_exec_time": 17500,
"transfer_operation_exec_time": 9600,
"transfer_to_savings_operation_exec_time": 6400,
"transfer_to_vesting_operation_exec_time": 44400,
"vote_operation_exec_time": 26500,
"withdraw_vesting_operation_exec_time": 10400,
"witness_set_properties_operation_exec_time": 9500,
"witness_update_operation_exec_time": 9500
}
}
}
# This is the result of get_resource_pool
resource_pool = {
"resource_history_bytes": {
"pool": "199290410749"
},
"resource_new_accounts": {
"pool": 24573481
},
"resource_market_bytes": {
"pool": "15970580402"
},
"resource_state_bytes": {
"pool": "132161364601521"
},
"resource_execution_time": {
"pool": "47263115029450"
}
}
# The value of total_vesting_shares is available from get_dynamic_global_properties()
total_vesting_shares = 397114288290855167
total_vesting_fund_hive = 196576920519
example_transactions = {
"vote" : {"tx" : {
"ref_block_num": 12345,
"ref_block_prefix": 31415926,
"expiration": "2018-09-28T01:02:03",
"operations": [
{
"type": "vote_operation",
"value": {
"voter": "alice1234567890",
"author": "bobob9876543210",
"permlink": "hello-world-its-bob",
"weight": 10000
}
}
],
"extensions": [],
"signatures": [
"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f40"
]
}, "tx_size" : 133},
"transfer" : {"tx" : {
"ref_block_num": 12345,
"ref_block_prefix": 31415926,
"expiration": "2018-09-28T01:02:03",
"operations": [
{
"type": "transfer_operation",
"value": {
"from": "alice1234567890",
"to": "bobob9876543210",
"amount" : {"amount":"50000111","precision":3,"nai":"@@000000013"},
"memo" : "#"+152*"x",
"permlink": "hello-world-its-bob",
"weight": 10000
}
}
],
"extensions": [],
"signatures": [
"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f40"
]
}, "tx_size" : 282},
"long_post" : {"tx" : {
"ref_block_num": 12345,
"ref_block_prefix": 31415926,
"expiration": "2018-09-28T01:02:03",
"operations":[{"type":"comment_operation","value":{
"parent_author":"alice1234567890",
"parent_permlink":"itsover9000",
"author":"bobob9876543210",
"permlink":40*"p",
"title":40*"t",
"body":7000*"x",
"json_metadata":2000*"m"
}},
{"type":"comment_options_operation",
"value":{"author":"bobob9876543210",
"permlink":40*"p",
"max_accepted_payout":{"amount":"1000000000","precision":3,"nai":"@@000000013"},
"percent_hive_dollars":10000,
"allow_votes":True,
"allow_curation_rewards":True,
"extensions":[{"type":"comment_payout_beneficiaries","value":{"beneficiaries":[{"account":"coolui1997","weight":1000}]}}]
}}],
"extensions":[],
"signatures":["1f3de3651752238dcaa8ecfbc3a5c49bca50769b0f1af7d01def32578cf33184eb3258572754eefd036cb62adf797d6e3950fb943b5301fc6d6add64adcbe85f94"]
}, "tx_size" : 9303},
"short_post" : {"tx":{
"ref_block_num": 12345,
"ref_block_prefix": 31415926,
"expiration": "2018-09-28T01:02:03",
"operations":[{"type":"comment_operation","value":{
"parent_author":"alice1234567890",
"parent_permlink":10*"p",
"author":"bobob9876543210",
"permlink":40*"p",
"title":40*"t",
"body":500*"x",
"json_metadata":150*"m"
}},
{"type":"comment_options_operation",
"value":{"author":"bobob9876543210",
"permlink":40*"p",
"max_accepted_payout":{"amount":"1000000000","precision":3,"nai":"@@000000013"},
"percent_hive_dollars":10000,
"allow_votes":True,
"allow_curation_rewards":True,
"extensions":[{"type":"comment_payout_beneficiaries","value":{"beneficiaries":[{"account":"coolui1997","weight":1000}]}}]
}}],
"extensions":[],
"signatures":["1f3de3651752238dcaa8ecfbc3a5c49bca50769b0f1af7d01def32578cf33184eb3258572754eefd036cb62adf797d6e3950fb943b5301fc6d6add64adcbe85f94"]},
"tx_size" : 952}
}
vote_tx = example_transactions["vote"]["tx"]
vote_tx_size = example_transactions["vote"]["tx_size"]
import json
count_resources = ResourceCounter(resource_params)
rc_regen = total_vesting_shares // (STEEM_RC_REGEN_TIME // STEEM_BLOCK_INTERVAL)
model = RCModel( resource_params=resource_params, resource_pool=resource_pool, rc_regen=rc_regen )
if __name__ == "__main__":
for example_name, etx in sorted(example_transactions.items()):
tx = etx["tx"]
tx_size = etx["tx_size"]
tx_cost = model.get_transaction_rc_cost(tx, tx_size)
total_cost = sum(tx_cost["cost"].values())
print("{:20} {:6.3f}".format(example_name, total_cost * total_vesting_fund_hive / (1000.0 * total_vesting_shares)))
To Run the tutorial
- review dev requirements
git clone https://gitlab.syncad.com/hive/devportal.git
cd devportal/tutorials/python/36_rcdemo
python rcdemo.py