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lambda_function.py
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lambda_function.py
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"""
This sample demonstrates a simple skill built with the Amazon Alexa Skills Kit.
The Intent Schema and Sample Utterances for this skill, as well
as testing instructions are located at https://github.com/EthVentures/AlexaSatori
"""
from __future__ import print_function
from satori.rtm.client import make_client, SubscriptionMode
import sys
import time
import threading
import math
endpoint = "wss://open-data.api.satori.com"
appkey = "YOUR-KEY-HERE" #https://developer.satori.com/#/signup
channel = "complete-ethereum-market-data"
# --------------- Helpers that build all of the responses ----------------------
def build_speechlet_response(title, output, reprompt_text, should_end_session):
return {
'outputSpeech': {
'type': 'PlainText',
'text': output
},
'card': {
'type': 'Simple',
'title': title,
'content': output
},
'reprompt': {
'outputSpeech': {
'type': 'PlainText',
'text': reprompt_text
}
},
'shouldEndSession': should_end_session
}
def build_response(session_attributes, speechlet_response):
return {
'version': '1.0',
'sessionAttributes': session_attributes,
'response': speechlet_response
}
# --------------- Functions that control the skill's behavior ------------------
def get_welcome_response():
""" If we wanted to initialize the session to have some attributes we could
add those here
"""
session_attributes = {}
card_title = "Welcome"
speech_output = "Welcome to Streaming Ether, an Alexa Skill powered by Satori Lyve Data. "
# If the user either does not reply to the welcome message or says something
# that is not understood, they will be prompted again with this text.
reprompt_text = "To get the market prices of ether, you may ask for the latest prices. "
should_end_session = False
return build_response(session_attributes, build_speechlet_response(
card_title, speech_output, reprompt_text, should_end_session))
def handle_session_end_request():
card_title = "Session Ended"
speech_output = "Goodbye"
# Setting this to true ends the session and exits the skill.
should_end_session = True
return build_response({}, build_speechlet_response(
card_title, speech_output, None, should_end_session))
def create_ether_tick():
with make_client(endpoint=endpoint, appkey=appkey) as client:
tick = []
event = threading.Event()
def read_callback(reply):
tick.append(reply)
event.set()
client.read(channel, callback=read_callback)
if not event.wait(2):
print('Read request timed out')
else:
price = tick[0]['body']['message']['price']
exchange = tick[0]['body']['message']['exchange']
print(price)
print(exchange)
print("Prices updated")
return
def ask_support_exchanges(intent, session):
""" responds support exchanges.
"""
session_attributes = {}
reprompt_text = None
card_title = intent['name']
session_attributes = {}
should_end_session = False
speech_output = "Latest prices are updated from all major crypto currency exchanges."
return build_response(session_attributes, build_speechlet_response(
card_title, speech_output, reprompt_text, should_end_session))
def ask_price_ether(intent, session):
with make_client(endpoint=endpoint, appkey=appkey) as client:
dollars, cents = 0, 0
tick = []
event = threading.Event()
def read_callback(reply):
tick.append(reply)
event.set()
client.read(channel, callback=read_callback)
if not event.wait(2):
print('Read request timed out')
else:
price = tick[0]['body']['message']['price']
exchange = tick[0]['body']['message']['exchange']
dollars = int(price)
cents = int((price - dollars)*100) #room for improvement, truncates for now instead of rounding fractional pennies
session_attributes = {}
reprompt_text = None
speech_output = "Last Price was " + str(dollars) + \
" dollars and " + str(cents) + " cents, reported by the " + exchange + " exchange."
should_end_session = False
return build_response(session_attributes, build_speechlet_response(
intent['name'], speech_output, reprompt_text, should_end_session))
# --------------- Events ------------------
def on_session_started(session_started_request, session):
""" Called when the session starts """
session_attributes = {}
print("on_session_started requestId=" + session_started_request['requestId']
+ ", sessionId=" + session['sessionId'])
def on_launch(launch_request, session):
""" Called when the user launches the skill without specifying what they
want
"""
print("on_launch requestId=" + launch_request['requestId'] +
", sessionId=" + session['sessionId'])
# Dispatch to your skill's launch
return get_welcome_response()
def on_intent(intent_request, session):
""" Called when the user specifies an intent for this skill """
print("on_intent requestId=" + intent_request['requestId'] +
", sessionId=" + session['sessionId'])
intent = intent_request['intent']
intent_name = intent_request['intent']['name']
# Dispatch to your skill's intent handlers
if intent_name == "AskPriceEther":
return ask_price_ether(intent, session)
elif intent_name == "AskSupportedExchanges":
return ask_support_exchanges(intent, session)
elif intent_name == "AMAZON.HelpIntent":
return get_welcome_response()
elif intent_name == "AMAZON.CancelIntent" or intent_name == "AMAZON.StopIntent":
return handle_session_end_request()
else:
raise ValueError("Invalid intent")
def on_session_ended(session_ended_request, session):
""" Called when the user ends the session.
Is not called when the skill returns should_end_session=true
"""
print("on_session_ended requestId=" + session_ended_request['requestId'] +
", sessionId=" + session['sessionId'])
# add cleanup logic here
# --------------- Main handler ------------------
def lambda_handler(event, context):
""" Route the incoming request based on type (LaunchRequest, IntentRequest,
etc.) The JSON body of the request is provided in the event parameter.
"""
print("event.session.application.applicationId=" +
event['session']['application']['applicationId'])
"""
Uncomment this if statement and populate with your skill's application ID to
prevent someone else from configuring a skill that sends requests to this
function.
"""
# if (event['session']['application']['applicationId'] !=
# "amzn1.echo-sdk-ams.app.[unique-value-here]"):
# raise ValueError("Invalid Application ID")
if event['session']['new']:
on_session_started({'requestId': event['request']['requestId']},
event['session'])
if event['request']['type'] == "LaunchRequest":
return on_launch(event['request'], event['session'])
elif event['request']['type'] == "IntentRequest":
return on_intent(event['request'], event['session'])
elif event['request']['type'] == "SessionEndedRequest":
return on_session_ended(event['request'], event['session'])