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err != nil

Chris Roche rodaine

err != nil
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View keybase.txt
### Keybase proof
I hereby claim:
* I am rodaine on github.
* I am rodaine ( on keybase.
* I have a public key whose fingerprint is E7D0 7DDE 4DF3 BB99 503C 5094 F3F3 7DC5 D98B EF21
To claim this, I am signing this object:
rodaine / bench.txt
Last active Dec 12, 2019
Code snippets for my blog post "The X-Files: Avoiding Concurrency Boilerplate with"
View bench.txt
BenchmarkMutexCache/10-8 10000000 180 ns/op 0 B/op 0 allocs/op
BenchmarkMutexCache/100-8 10000000 187 ns/op 0 B/op 0 allocs/op
BenchmarkMutexCache/1000-8 10000000 214 ns/op 0 B/op 0 allocs/op
BenchmarkMutexCache/10000-8 10000000 231 ns/op 0 B/op 0 allocs/op
BenchmarkMutexCache/100000-8 5000000 254 ns/op 2 B/op 0 allocs/op
BenchmarkMutexCache/1000000-8 1000000 1159 ns/op 102 B/op 1 allocs/op
BenchmarkMutexCache/10000000-8 1000000 1481 ns/op 184 B/op 2 allocs/op
BenchmarkMutexCache/100000000-8 1000000 1655 ns/op 187 B/op 3 allocs/op
BenchmarkSyncMapCache/10-8 5000000 221 ns/op 0 B/op 0 allocs/op
rodaine /
Last active Apr 7, 2019
Sniff (HTTP/2 | gRPC) Headers with tshark
#!/usr/bin/env bash
[ $# -eq 1 ] || (echo "Usage: ${0} PORT" && exit 1)
echo "capturing HTTP/2 headers on ${1}"
tshark -i lo0 \
-l -Q \
-T fields \
-E aggregator="|" \
-e tcp.port \
rodaine / fast.go
Last active Oct 11, 2018
Code snippets for my blog post "The X-Files: Controlling Throughput with rate.Limiter" (
View fast.go
// RateLimit middleware limits the throughput to h using TickerLimiter
// configured with the provided rps and burst. The request will idle
// for the passed in wait before cancelling if there is a queue.
func RateLimit(rps, burst int, wait time.Duration, h http.HandlerFunc) http.HandlerFunc {
l, _ := TickerLimiter(rps, burst)
return func(w http.ResponseWriter, r *http.Request) {
t := time.NewTimer(wait)
select {
case <-l:
rodaine /
Last active Sep 13, 2019
Tomorrow Night Eighties - Slack Theme

Based on the Tomorrow Night Eighties theme

Paste the following in the Preferences > Sidebar Theme > Custom Theme import/export field:

rodaine / bytesreader.go
Last active Jul 27, 2020
Code snippets for my blog post "Asynchronously Split an io.Reader in Go" (
View bytesreader.go
func handleUpload(u io.Reader) (err error) {
// capture all bytes from upload
b, err := ioutil.ReadAll(u)
if err != nil {
// wrap the bytes in a ReadSeeker
r := bytes.NewReader(b)
View gist:5afef69c5f8f546ec727
### Keybase proof
I hereby claim:
* I am rodaine on github.
* I am rodaine ( on keybase.
* I have a public key whose fingerprint is 3A81 0489 67F8 B7E0 1D4C 1198 00AD F8A1 DA5A D971
To claim this, I am signing this object:
rodaine / bar.php
Last active Aug 29, 2015
How to mock a protected property on an object (assume for class Baz, Baz#foo uses Baz::$bar which needs to be mocked)
View bar.php
class Bar
public function getSomething()
return 'something';
rodaine / Prism.markdown
Last active Dec 23, 2015
A Pen by Chris Roche.
View Prism.markdown


HTML5 Canvas based animations reminiscent of the Bezier screensaver from Windows. Essentially, it is a bunch of triangles of random color/opacity whose vertices translate independently. Tweak the values at in the config object at the top of the JS editor to affect the number of triangles, the speed of the animation, and the color pallette used.

Thanks to Paul Irish for his article on requestAnimationFrame (, and Bob Nystrom for his book on Game Programming Patterns ( which inspired the loop logic for this pen.

A Pen by Chris Roche on CodePen.


rodaine / functions.php
Created Sep 11, 2013
Gists for an upcoming blog post titled "Add A Custom Wordpress Admin Contextual Help Menu To Your Plugin Or Theme"
View functions.php
add_action('init', 'cjr_register_books_cpt');
add_action('admin_menu', 'cjr_add_book_settings');
* Registers the Books CPT to WordPress. Must be called in 'init' action hook.
function cjr_register_books_cpt()
You can’t perform that action at this time.