jamesmartin
/ fork_exec.rb
Created
May 4, 2015 06:21
Fork/exec a sub process, wait for it to rejoin and then print the status
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| # Runs exec inside the fork in order to capture the output of the subprocess | |
| pid = fork { exec('ssh 127.0.0.1') } | |
| _, status = Process.waitpid2(pid) | |
| puts status.success? |
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| exports.first = function(l) { | |
| return l[0] | |
| }; | |
| exports.rest = function(l) { | |
| return l.reduce(function(accumulator, item, index) { | |
| if(index > 0) { | |
| accumulator.push(item); | |
| } | |
| return accumulator; |
jamesmartin
/ safe_struct.rb
Last active
August 29, 2015 14:18
Define a struct-like object, with attributes that can be called normally, or yielded when they exist.
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| class SafeStruct | |
| def self.with_attributes(params) | |
| params.keys.map do |key| | |
| define_method(key) do |&block| | |
| ivar = instance_variable_get("@#{key}".to_sym) | |
| if block && !ivar.nil? | |
| block.call(ivar) | |
| end | |
| ivar | |
| end |
jamesmartin
/ descendants_spec.rb
Last active
August 29, 2015 14:17
Recursively collect all descendants of a Person
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| require 'rspec' | |
| require 'person' | |
| describe "descendants" do | |
| it "returns all its descendants" do | |
| sonny = Person.new('Sonny') | |
| pa = Person.new('Pa', sonny) | |
| grandpa = Person.new('Grandpa', pa) | |
| expect(Person.all_descendants_of(grandpa).map(&:name)).to eq ['Pa', 'Sonny'] |
jamesmartin
/ callable_conditions.rb
Created
February 9, 2015 19:47
Select from a list of values where arbitrary conditions are met
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| def has_foo? | |
| ->(thing) { thing == "foo" } | |
| end | |
| def has_bar? | |
| ->(thing) { thing == "bar" } | |
| end | |
| def has_baz? | |
| ->(thing) { thing == "baz" } |
jamesmartin
/ gist:a648b6ca27017c7d888b
Last active
November 6, 2020 06:10
Timezone Problems with Timecop and Circle CI
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| # System time zone is set to 'Australia/Sydney' | |
| # | |
| Time.zone = "Europe/Madrid" | |
| => "Europe/Madrid" | |
| Timecop.freeze(Time.zone.now) | |
| => 2015-02-06 23:36:46 +1100 # The "frozen" time. +1100 is Australia/Sydney. Oh dear. | |
| Time.zone.now | |
| => Fri, 06 Feb 2015 13:36:46 CET +01:00 # The time here is for the configured Time.zone; Europe/Madrid +01:00 |
jamesmartin
/ mask_subdomains
Last active
February 3, 2019 12:54
Varnish: Route requests to subdomains based on URL
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| backend insights { | |
| .host = "insights.example.com" | |
| .port = "3000"; | |
| } | |
| backend help { | |
| .host = "help.example.com" | |
| .port = "80"; | |
| } |
jamesmartin
/ application.js.coffee
Created
October 16, 2014 01:50
Uneasy Bedfellows: Rails, RequireJS and the Asset Pipeline
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| #= require jquery | |
| #= require jquery_ujs | |
| #= require turbolinks | |
| #= require bootstrap | |
| # | |
| #= require require-config | |
| #= require requirejs/require | |
| #= require_tree . | |
| # | |
| define "jquery", -> window.jQuery |
jamesmartin
/ runtime.sh
Last active
December 20, 2015 16:19
Calculate the duration (in seconds) of a process based on its log file entries.
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| timestamp() { | |
| date -j -f "%Y-%m-%d%H:%M:%S" $* +%s | |
| } | |
| extract_time_field(){ | |
| echo $* | awk '{print $1$2}' | awk -F',' '{print $1}' | |
| } | |
| for logfile in `ls *.log`; do | |
| starttime=$(extract_time_field $(cat $logfile | head -n1)) |
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| # target listens for connection | |
| nc -l <port> > /path/to/target/destination/file | |
| # host sends file | |
| nc <listener_ip> <port> < /path/to/source/file |