i had developed a external adapter that make a http get request to cryptocompare api and get latest eth-usd price for me.
from bridge import Bridge
class Adapter:
base_url = 'https://min-api.cryptocompare.com/data/price'
from_params = ['base', 'from', 'coin']
to_params = ['quote', 'to', 'market']
def __init__(self, input):
self.id = input.get('id', '1')
self.request_data = input.get('data')
if self.validate_request_data():
self.bridge = Bridge()
self.set_params()
self.create_request()
else:
self.result_error('No data provided')
def validate_request_data(self):
if self.request_data is None:
return False
if self.request_data == {}:
return False
return True
def set_params(self):
for param in self.from_params:
self.from_param = self.request_data.get(param)
if self.from_param is not None:
break
for param in self.to_params:
self.to_param = self.request_data.get(param)
if self.to_param is not None:
break
def create_request(self):
try:
params = {
'fsym': self.from_param,
'tsyms': self.to_param,
}
response = self.bridge.request(self.base_url, params)
data = response.json()
self.result = data[self.to_param]
data['result'] = self.result
self.result_success(data)
except Exception as e:
self.result_error(e)
finally:
self.bridge.close()
def result_success(self, data):
self.result = {
'jobRunID': self.id,
'data': data,
'result': self.result,
'statusCode': 200,
}
def result_error(self, error):
self.result = {
'jobRunID': self.id,
'status': 'errored',
'error': f'There was an error: {error}',
'statusCode': 500,
}
i was successful in getting eth-usd price. Here is the question that can i use smtp protocol in smart contract?
smtp mail sending code
# the first step is always the same: import all necessary components:
import smtplib
from socket import gaierror
now you can play with your code. Let’s define the SMTP server separately here:
port = 2525
smtp_server = "smtp.mailtrap.io"
login = "1a2b3c4d5e6f7g" # paste your login generated by Mailtrap
password = "1a2b3c4d5e6f7g" # paste your password generated by Mailtrap
specify the sender’s and receiver’s email addresses
sender = "from@example.com"
receiver = "mailtrap@example.com"
type your message: use two newlines (\n) to separate the subject from the message body, and use 'f' to automatically insert variables in the text
message = f"""
Subject: Hi Mailtrap
To: {receiver}
From: {sender}
This is my first message with Python."""
try:
#send your message with credentials specified above
with smtplib.SMTP(smtp_server, port) as server:
server.login(login, password)
server.sendmail(sender, receiver, message)
# tell the script to report if your message was sent or which errors need to be fixed
print('Sent')
except (gaierror, ConnectionRefusedError):
print('Failed to connect to the server. Bad connection settings?')
except smtplib.SMTPServerDisconnected:
print('Failed to connect to the server. Wrong user/password?')
except smtplib.SMTPException as e:
print('SMTP error occurred: ' + str(e))
