| docker run -d --name ipfs-node -p 8080:8080 -p 8081:8081 -p 4001:4001 -p 127.0.0.1:5001:5001 ipfs/go-ipfs:v0.4.22 |
| docker run -it -p 28000:27017 --name mongoContainer mongo:3.6.13 mongo "mongodb+srv://<HOST>/<DB>" --username <USERNAME> |
| from eth_keys import keys | |
| from eth_utils import decode_hex | |
| # Private key here | |
| priv_key_bytes = decode_hex('0xfbef6fd0f61d054be68aa044d033d83b87ed1bbde658dfa0b4bfdb06e39f6af6') | |
| priv_key = keys.PrivateKey(priv_key_bytes) | |
| pub_key = priv_key.public_key | |
| print(pub_key) | |
| print(pub_key.to_address()) |
| <!DOCTYPE html> | |
| <html> | |
| <head lang="en"> | |
| <meta charset="utf-8" /> | |
| <title>BIP39 - Mnemonic Code</title> | |
| <style>/*! | |
| * Bootstrap v3.3.7 (http://getbootstrap.com) | |
| * Copyright 2011-2016 Twitter, Inc. | |
| * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) | |
| */ |
| from web3 import Web3 | |
| import requests | |
| CONTRACT_ADDRESS = '0x39aa39c021dfbae8fac545936693ac917d5e7563' | |
| def main(): | |
| w3 = Web3(Web3.HTTPProvider('https://mainnet.infura.io/v3/<YOUR PROJECT ID>')) | |
| r = requests.get(f'https://api.etherscan.io/api?module=contract&action=getabi&address={CONTRACT_ADDRESS}') | |
| checksummed_address = w3.toChecksumAddress(CONTRACT_ADDRESS) |
| if (total_borrow / total_supply) > 0.65 or liquidity < 10000000000000: | |
| r = requests.post( | |
| 'https://api.mailgun.net/v3/<YOUR DOMAIN>/messages', | |
| auth=('api', '<YOUR API KEY>'), | |
| data={'from': 'DeFi Alerts <alerts@defi.com>', | |
| 'to': ['<YOUR EMAIL ADDRESS>'], | |
| 'subject': "High utilization or low liquidity", | |
| 'text': f"Current rate {total_borrow / total_supply}\n" + | |
| f"Current liquidity {liquidity / 1000000}"}) |
For those who have no idea what the title says, I offer my apology here. Finance by itself is a deep topic with many trade-offs, similar to the world of engineering. According to a greate economists Thomas Sowell
There are no solutions, only trade-offs
In the DeFi (Decentralized Finance) sense, as much as we all love the high interest rates, the trade-offs aren't always clear in this nascent industry. The underlying concept is really simple and sound. It goes something like this:
| apiVersion: batch/v1beta1 | |
| kind: CronJob | |
| metadata: | |
| namespace: dev | |
| name: steven-cron | |
| labels: | |
| app: steven-cron | |
| spec: | |
| schedule: "* * * * *" | |
| jobTemplate: |
| apiVersion: kops.k8s.io/v1alpha2 | |
| kind: InstanceGroup | |
| metadata: | |
| labels: | |
| kops.k8s.io/cluster: steven.k8s.com | |
| name: frequent-cronjob-nodes | |
| spec: | |
| image: kope.io/k8s-1.13-debian-stretch | |
| machineType: m4.xlarge | |
| maxSize: 2 |
All right folks, I intend to keep this one short and that's what I will do. I mean, it's supposed to be easy but the official documentations(1, 2) make it unnecessary confusing. So I think maybe I can help filling in the gap.
I will be using one of our business requirements at Buffer in this project, as the example for this blog post.
So, we need a few nodes that are dedicated to running cronjobs, and nothing else. At the same time we want to make sure the cornjobs are scheduled to these nodes, and nowhere else. This means we need 2 things