coderfi

The new 1.10 version of hdf5 library is stable. You can now install from the source to use this new capability.

The installation process has a few caveats, so here is how to do it.

Note:

1. you need to first remove the hdf5 libraries currently installed in ubuntu.
2. Then you need to reinstall h5py.
3. when you reinstall h5py via pip, use the --no-binary flag. This is because the h5py wheel comes with its own hdf5 binary.

Instructions:

coderfi

//
// The new assembly support in Solidity makes writing helpers easy.
// Many have complained how complex it is to use `ecrecover`, especially in conjunction
// with the `eth_sign` RPC call. Here is a helper, which makes that a matter of a single call.
//
// Sample input parameters:
// (with v=0)
// "0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad",
// "0xaca7da997ad177f040240cdccf6905b71ab16b74434388c3a72f34fd25d6439346b2bac274ff29b48b3ea6e2d04c1336eaceafda3c53ab483fc3ff12fac3ebf200",
// "0x0e5cb767cce09a7f3ca594df118aa519be5e2b5a"

coderfi

#!/usr/bin/env python3

import json
from datetime import datetime
from urllib.request import urlopen

# todo: https://github.com/ethereum/go-ethereum/blob/release/1.8/params/bootnodes.go

url = 'https://github.com/paritytech/parity-ethereum/blob/v1.11.11/ethcore/res/ethereum/foundation.json?raw=true'
with urlopen(url) as rs:

coderfi

#!/usr/bin/env python3

from datetime import datetime
import dns.resolver
import time

# pip install --user dnspython
# https://bitcoin.stackexchange.com/questions/14371/what-is-a-dns-seed-node-vs-a-seed-node
# https://bitcoin.stackexchange.com/questions/2027/how-does-the-bitcoin-client-make-the-initial-connection-to-the-bitcoin-network/2030#2030

coderfi

#!/usr/bin/env bash

INGRESS_HOST=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')

if [[ "${INGRESS_HOST}" == "" ]]; then
  # assume minikube
  INGRESS_HOST=$(minikube ip)
  INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].nodePort}')
else
  INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].port}')

coderfi

#!/usr/bin/env bash

# Usage:
#     eval $(bash ./gateway-env.sh)
# Author:  coderfi@gmail.com

INGRESS_HOST=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')

if [[ "${INGRESS_HOST}" == "" ]]; then
    # assume minikube

coderfi

{
    "Statement": [
        {
            "Action": [
                "apigateway:*",
                "appsync:CreateApiKey",
                "appsync:CreateDataSource",
                "appsync:CreateFunction",
                "appsync:CreateGraphqlApi",
                "appsync:CreateResolver",

coderfi

service: service-name

provider:
  name: aws
  runtime: nodejs6.10

functions:
  myfunc:
    handler: handler.myfunc

coderfi

#!/usr/bin/env python3

import base64
import datetime
import json
import logging
import os
import sys
import time
import traceback

coderfi

LambdaContext

Here is the raw output from examining the LambdaContext context object in a AWS Lambda function when called from a CloudFormation stack. More information on the context object can be found here : http://docs.aws.amazon.com/lambda/latest/dg/python-context-object.html

LambdaContext object : print(context)

<__main__.LambdaContext object at 0x7fd706780710>

LambdaContext vars : vars(context)