import requests
from ...errors import NetworkException
[docs]class BlockcypherFeeEstimator:
"""
A class representing a Litecoin fee rate estimator using Blockcypher.
"""
[docs] def __init__(self, request_interval=(3, 1), api_key=None):
"""
Initializes an instance of the BlockcypherFeeEstimator class.
Args:
request_interval (tuple): A pair of integers indicating the number
of requests allowed during a particular amount of seconds.
Set to (0, N) for no rate limiting, where N > 0.
api_key (str): The API key for accessing the Blockcypher API.
"""
self.requests, self.interval_sec = request_interval
self.api_key = api_key
[docs] def get_fee_rate(self):
"""
Retrieves the current fee rate for Litecoin transactions.
Raises:
NetworkException: If the API request fails or the fee rate cannot be retrieved
"""
# Define the default API URL within the method for Blockcypher Litecoin:
api_url = "https://api.blockcypher.com/v1/ltc/main" # Adjust the endpoint for Litecoin
params = None
if self.api_key:
params = {
"token": self.api_key
} # Fix the assignment of the API key parameter
# Get the current fee rate from the specified API:
for attempt in range(3, -1, -1):
if attempt == 0:
raise NetworkException("Network request failure")
try:
response = requests.get(api_url, params=params, timeout=60)
break
except requests.RequestException:
pass
except requests.exceptions.JSONDecodeError:
pass
if response.status_code == 200:
data = response.json()
fee_rate_kb = data["high_fee_per_kb"]
fee_rate_vbyte = fee_rate_kb / 1000 # Convert to sats/vByte
return fee_rate_vbyte
else:
raise NetworkException(
"Failed to retrieve current fee rate from Blockcypher for Litecoin"
)