def test_pricefeed(self):
feed = objects.PriceFeed(
**{
"settlement_price":
objects.Price(
base=objects.Asset(amount=214211, asset_id="1.3.0"),
quote=objects.Asset(amount=1241, asset_id="1.3.14"),
),
"core_exchange_rate":
objects.Price(
base=objects.Asset(amount=1241, asset_id="1.3.0"),
quote=objects.Asset(amount=6231, asset_id="1.3.14"),
),
"maximum_short_squeeze_ratio":
1100,
"maintenance_collateral_ratio":
1750,
})
self.op = operations.Asset_publish_feed(
fee=objects.Asset(amount=100, asset_id="1.3.0"),
publisher="1.2.0",
asset_id="1.3.3",
feed=feed,
)
self.cm = ("f68585abf4dce7c8045701136400000000000000000003c344030"
"00000000000d9040000000000000ed6064c04d904000000000000"
"0057180000000000000e0000012009e13f9066fedc3c8c1eb2ac3"
"3b15dc67ecebf708890d0f8ab62ec8283d1636002315a189f1f5a"
"a8497b41b8e6bb7c4dc66044510fae25d8f6aebb02c7cdef10")
self.doit()
def test_pricefeed(self):
feed = objects.PriceFeed(
**{
"settlement_price":
objects.Price(
base=objects.Asset(amount=214211, asset_id="1.3.0"),
quote=objects.Asset(amount=1241, asset_id="1.3.14"),
),
"core_exchange_rate":
objects.Price(
base=objects.Asset(amount=1241, asset_id="1.3.0"),
quote=objects.Asset(amount=6231, asset_id="1.3.14"),
),
"maximum_short_squeeze_ratio":
1100,
"maintenance_collateral_ratio":
1750,
})
op = operations.Asset_publish_feed(fee=objects.Asset(amount=100,
asset_id="1.3.0"),
publisher="1.2.0",
asset_id="1.3.3",
feed=feed)
ops = [Operation(op)]
tx = Signed_Transaction(ref_block_num=ref_block_num,
ref_block_prefix=ref_block_prefix,
expiration=expiration,
operations=ops)
tx = tx.sign([wif], chain=prefix)
tx.verify([PrivateKey(wif).pubkey], "BTS")
txWire = hexlify(bytes(tx)).decode("ascii")
compare = ("f68585abf4dce7c8045701136400000000000000000003c344030"
"00000000000d9040000000000000ed6064c04d904000000000000"
"0057180000000000000e0000012009e13f9066fedc3c8c1eb2ac3"
"3b15dc67ecebf708890d0f8ab62ec8283d1636002315a189f1f5a"
"a8497b41b8e6bb7c4dc66044510fae25d8f6aebb02c7cdef10")
self.assertEqual(compare[:-130], txWire[:-130])
def publish_price_feed(self,
symbol,
settlement_price,
cer=None,
mssr=110,
mcr=200,
account=None):
""" Publish a price feed for a market-pegged asset
:param str symbol: Symbol of the asset to publish feed for
:param bitshares.price.Price settlement_price: Price for settlement
:param bitshares.price.Price cer: Core exchange Rate (default ``settlement_price + 5%``)
:param float mssr: Percentage for max short squeeze ratio (default: 110%)
:param float mcr: Percentage for maintenance collateral ratio (default: 200%)
:param str account: (optional) the account to allow access
to (defaults to ``default_account``)
.. note:: The ``account`` needs to be allowed to produce a
price feed for ``symbol``. For witness produced
feeds this means ``account`` is a witness account!
"""
assert isinstance(
settlement_price, Price
), "settlement_price needs to be instance of `bitshares.price.Price`!"
if not account:
if "default_account" in config:
account = config["default_account"]
if not account:
raise ValueError("You need to provide an account")
account = Account(account, bitshares_instance=self)
asset = Asset(symbol, bitshares_instance=self, full=True)
assert asset["id"] == settlement_price["base"]["asset"]["id"] or \
asset["id"] == settlement_price["quote"]["asset"]["id"], \
"Price needs to contain the asset of the symbol you'd like to produce a feed for!"
assert asset.is_bitasset, "Symbol needs to be a bitasset!"
assert settlement_price["base"]["asset"]["id"] == asset["bitasset_data"]["options"]["short_backing_asset"] or \
settlement_price["quote"]["asset"]["id"] == asset["bitasset_data"]["options"]["short_backing_asset"], \
"The Price needs to be relative to the backing collateral!"
# Base needs to be short backing asset
if settlement_price["base"]["asset"]["id"] == asset["bitasset_data"][
"options"]["short_backing_asset"]:
settlement_price = settlement_price.invert()
if cer:
if cer["base"]["asset"]["id"] == asset["bitasset_data"]["options"][
"short_backing_asset"]:
cer = cer.invert()
else:
cer = settlement_price * 1.05
op = operations.Asset_publish_feed(
**{
"fee": {
"amount": 0,
"asset_id": "1.3.0"
},
"publisher": account["id"],
"asset_id": asset["id"],
"feed": {
"settlement_price": settlement_price.json(),
"core_exchange_rate": cer.json(),
"maximum_short_squeeze_ratio": int(mssr * 10),
"maintenance_collateral_ratio": int(mcr * 10),
},
"prefix": self.rpc.chain_params["prefix"]
})
return self.finalizeOp(op, account["name"], "active")
