Jeff Terrell kyptin

Keybase proof

I hereby claim:

I am kyptin on github.
I am kyptin (https://keybase.io/kyptin) on keybase.
I have a public key ASDD9FgPd0WBlTnf1EGJJlzQ2wQ_WhmtuNRrB5eVH5ZSgwo

To claim this, I am signing this object:

If you're running a Rails app in Google App Engine's flexible environment, it takes a bit of setup to get to a rails console attached to your deployed environment. I wanted to document the steps for my own reference and also as an aid to others.

Open the Google App Engine -> instances section of the Google Cloud Platform (GCP) console.
Select the "SSH" drop-down for a running instance. (Which instance? Both of my instances are in the same cluster, and both are running Rails, so it didn't matter for me. YMMV.) You have a choice about how to connect via ssh.
1. Choose "Open in browser window" to open a web-based SSH session, which is convenient but potentially awkward.
2. Choose "View gcloud command" to view and copy a gcloud command that you can use from a terminal, which lets you use your favorite terminal app but may require the extra steps of installing the gcloud command and authenticating the gcloud command with GCP.

	#!/bin/bash

	# Referenced in Leiningen Issue #1180, here:
	# https://github.com/technomancy/leiningen/issues/1180

	if [ ! -z `ls -A \| egrep -v '^(main\|child\|grandchild\|setup-nested-lein-projects.sh)$'` ]; then
	echo "Cowardly refusing to continue in a directory with unrecognized files."
	exit 0
	fi

	#!/bin/bash

	# Referenced in Leiningen Issue #1190, here:
	# https://github.com/technomancy/leiningen/issues/1190

	if [ ! -z `ls -A \| egrep -v '^(main\|child\|grandchild\|greatgrandchild\|setup-3level-lein-checkouts.sh)$'` ]; then
	echo "Cowardly refusing to continue in a directory with unrecognized files."
	exit 0
	fi

	(ns perftest.core
	(:require
	[clojure.java.io :as io]))

	(defn perftest
	[]
	(with-open [writer (io/writer "times.out")]
	(let [bigseq (range 1e8)]
	(doall
	(for [item bigseq]

	ec2-ssh ()
	{
	local host="ec2-user@$1";
	local opts;
	opts="-i $HOME/TestKeyPair.pem";
	opts="$opts -o UserKnownHostsFile=/dev/null";
	opts="$opts -o StrictHostKeyChecking=no";
	scp $opts ~/aws-bashrc $host:.bashrc && ssh $opts ec2-user@$@
	}

	(ns s3-presigned-url
	"You can pre-sign an S3 path to allow users to access it without credentials.
	This gives fine-grained access control with expiration to 'anonymous' (from
	the perspective of S3) users. It's a convenient mechanism, if you can get it
	to work.

	There are some relatively well-trod paths for doing pre-signed S3 URLs, e.g.
	when giving read-only access via an HTTP GET request. These paths have more
	convenient and well-known mechanisms out there.

	(defn make-cdf
	"Given a seq of numbers, return a plottable vector of [x,y] pairs
	representing the cumulative distribution function.
	Ex:
	(cdf-data [1 2 1 3])
	; => [[1 0] [1 1/2] [2 3/4] [3 1]]"
	[xs]
	{:pre [(sequential? xs)]}
	(let [n (count xs)
	uniq-xs (->> xs frequencies (into (sorted-map)))

	(defn entropy
	"Calculate the Shannon entropy, a.k.a. amount of information, in a
	distribution. Uses the log-base-2 version, so the result can be thought of as
	the number of bits of information. Accepts either a seq of numbers or a map of
	freqencies like that returned by the `clojure.core/freqencies` function.
	Ex:
	(entropy [1]) ; => 0.0
	(entropy [0 1 0 1]) ; => 1.0
	(entropy [0 1 2 3]) ; => 2.0
	(entropy {0 2, 1 2}) ; => 1.0