Golang Closures For Configuration
One common code smell is creating functions with a long list of parameters. Adding a new function usually starts out optimistically with a few inputs or known state that is needed. Over time you start adding more state and extending functionality of existing code and quickly it turns into something that is no longer maintainable or causes issues of other places in the codebase needed a larger list of dependencies and state to call these codepaths. Let’s look at one approach you can take with golang.
Serverless Events with Existing S3 Bucket
Serverless helps you with functions as a service across multiple providers. Using serverless with AWS allows you to tie these functions into your AWS infrastructure, or tie it into existing resources. Previously you couldn’t use existing S3 buckets for serverless lambda events. Today I learned that you can now use existing buckets.
Golang Debug Bytes
Terraform helps in creating cross-cloud immutable infrastructure with code. As with most code there is an ideal of having your codebase automated with tests and deploys. How can this work with terraform? Does it work in a sensible way to give you confidence in your changes and how they ultimately get applied? Trying to answer these questions led to the following approach that I’ve used to attempt to try having a CI/CD solution for a terrorm codebase.
Golang Printing Tabstopped Text into Aligned Columns
One of the strengths of Golang as a language is it has a pretty strong standard library of packages out of the box. Things like the httptest package and even the http package is strong enough that there are countless http servers open sourced built on top of it. One of the hidden convenient packages I’ve used is the tabwriter to help print out tabstopped text into aligned text.
Bash Say Command In CI
Sometimes you just need to
say it from a bash script and some times your
CI provider won’t be OK with that. Today I learned of one such provider, CircleCI
who didn’t want to play nicely with using
Golang Testing time.Now
Testing time objects can be a pain. Some languages offer some helpful libraries that can help like VCR in Ruby. Other tools to help are mocking libraries to where you can mock and stub out the time calls to what you want. In golang there is another way to help and that is using dependency injection to help make testing easier.
Momentjs Date Mutation
Ruby 2.6 Endless Range
For a today I learned moment I ran into the new endless range feature in ruby 2.6 by coming across some code that triggered this error message:
RangeError (cannot get the last element of endless range)
The code that was updated to the latest ruby 2.6 release had a dynamic range that was pulling fields from a database and doing something like this: