change_mpa.py

from grapheneapi.grapheneapi import GrapheneAPI
import json

perm = {}
perm["charge_market_fee"] = 0x01
perm["white_list"] = 0x02
perm["override_authority"] = 0x04
perm["transfer_restricted"] = 0x08
perm["disable_force_settle"] = 0x10
perm["global_settle"] = 0x20
perm["disable_confidential"] = 0x40
perm["witness_fed_asset"] = 0x80
perm["committee_fed_asset"] = 0x100
GRAPHENE_100_PERCENT = 10000
GRAPHENE_1_PERCENT = GRAPHENE_100_PERCENT / 100


if __name__ == '__main__':
    rpc = GrapheneAPI("localhost", 8092)

    issuer = "faucet"
    symbol = "PEG.LAST" # LAST, RANDOM, PARITY
    backing = "1.3.0"

    account = rpc.get_account(issuer)
    asset = rpc.get_asset(symbol)

    permissions = {"charge_market_fee" : True,
                   "white_list" : True,
                   "override_authority" : True,
                   "transfer_restricted" : True,
                   "disable_force_settle" : True,
                   "global_settle" : True,
                   "disable_confidential" : True,
                   "witness_fed_asset" : True,
                   "committee_fed_asset" : True,
                   }
    flags       = {"charge_market_fee" : False,
                   "white_list" : False,
                   "override_authority" : False,
                   "transfer_restricted" : False,
                   "disable_force_settle" : False,
                   "global_settle" : False,
                   "disable_confidential" : False,
                   "witness_fed_asset" : True,
                   "committee_fed_asset" : False,
                   }
    permissions_int = 0
    for p in permissions :
        if permissions[p]:
            permissions_int += perm[p]
    flags_int = 0
    for p in permissions :
        if flags[p]:
            flags_int += perm[p]
    options = {"max_supply" : 1000000000000000,
               "market_fee_percent" : 0,
               "max_market_fee" : 1000000000000000,
               "issuer_permissions" : permissions_int,
               "flags" : flags_int,
               "core_exchange_rate" : {
                   "base": {
                       "amount": 10,
                       "asset_id": "1.3.0"},
                   "quote": {
                       "amount": 10,
                       "asset_id": asset["id"]}},
               "whitelist_authorities" : [],
               "blacklist_authorities" : [],
               "whitelist_markets" : [],
               "blacklist_markets" : [],
               "description" : "Feed: Last Trade Price - every 15 minutes"
               }
    tx = rpc.update_asset(symbol, None, options, True)
    print(json.dumps(tx, indent=4))