ChuntaoLu

This doc proposes an abstraction to set fixture expectations for mock clients during a test run.

Overview

The goal is to treat fixtures management as first class citizen and maintain clean fixture semantics. Fixtures that belong to a specific client should reside in a centralized place associated with that client. It should be recognized that the mock client and its affinitivie fixtures together can become one functional unit. With this realization, the action of setting input/output expectations for a mock client method becomes implementation details and can be abstracted away by defining a method with the same expectation semantic on the combined functional unit. For example, instead of writing

import store "import/path/to/store/fixture"

// ad-hoc fixtures
userHeader := map[string]string{
	"x-client-version": "1.1.2",

ChuntaoLu

1. brew install gnupg21, pinentry-mac (this includes gpg-agent and pinentry)

2. Generate a key: $ gpg2 --gen-key

3. Take the defaults. Whatevs

4. Tell gpg-agent to use pinentry-mac:

   $ vim ~/.gnupg/gpg-agent.conf 
   

ChuntaoLu

HTTP Streaming (or Chunked vs Store & Forward)

The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.

However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on

ChuntaoLu

  --log_gc (Log heap samples on garbage collection for the hp2ps tool.)
        type: bool  default: false
  --expose_gc (expose gc extension)
        type: bool  default: false
  --max_new_space_size (max size of the new generation (in kBytes))
        type: int  default: 0
  --max_old_space_size (max size of the old generation (in Mbytes))
        type: int  default: 0
  --max_executable_size (max size of executable memory (in Mbytes))
        type: int  default: 0

ChuntaoLu

import os
import subprocess
import glob


# the shell command that embeds and subsets fonts in a pdf file
cmd = "gs -dSAFER -dNOPLATFONTS -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sPAPERSIZE=letter -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dCompatibilityLevel=1.4 -dMaxSubsetPct=100 -dSubsetFonts=true -dEmbedAllFonts=true -sOutputFile={} -f {}"

for file_path in glob.glob(os.path.join('unembedded_dir_path', '*.pdf')):
    target_path = os.path.join('embedded_dir_path', os.path.basename(file_path))

ChuntaoLu

## Useful Collections

def a_array
  (1..6).to_a
end

def a_hash
  {hello: "world", free: "of charge"}
end

ChuntaoLu

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

ChuntaoLu

# autoload concerns
module YourApp
  class Application < Rails::Application
    config.autoload_paths += %W(
      #{config.root}/app/controllers/concerns
      #{config.root}/app/models/concerns
    )
  end
end

ChuntaoLu

gem 'pg'
group :development do
	gem 'ruby-debug'
end
gem 'rake', '~> 0.8.7'
gem 'devise'
gem 'oa-oauth', :require => 'omniauth/oauth'
gem 'omniauth'
gem 'haml'
gem 'dynamic_form'

ChuntaoLu

• create a new redis .conf file

$ cp /etc/redis/6379.conf /etc/redis/6380.conf

• edit /etc/redis/6380.conf, illustrated as below

...