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DJ - Play with delayed jobs
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############################################################################### | |
# DJ - Play with Delayed Jobs | |
# | |
# ('∀`) | |
# _ ノ )>_ | |
# /.◎。/◎。/| | |
# | ̄ ̄ ̄ ̄ ̄| | |
# | |
# API: | |
# | |
# sample - Fetch a snapshot of the current Delayed::Job records | |
# echo - Pretty print the current desk | |
# monitor - Sample every 5 seconds until enter is pressed | |
# track(id) - Load the retrieved delayed job as current | |
# play - Invoke the current delayed job | |
# rewind - Reset last_error and attempts attributes of the current job | |
# scratch - Inspect the last error and handler of the current job | |
# eject - Delete the current delayed job | |
# eject_all - Delete all delayed jobs | |
# | |
############################################################################### | |
class DJ | |
PAD_ROW = "-%12s | %-30s | %-2s\n".freeze | |
def initialize | |
@deck = nil | |
@current = nil | |
sample | |
end | |
attr_reader :deck, :current | |
def sample | |
@deck = fetch_deck | |
echo | |
end | |
def echo | |
printf(PAD_ROW, "ID", "QUEUE", "ATTEMPTS") | |
deck.each do |row| | |
printf(PAD_ROW, row[0], row[1], row[2]) | |
end | |
log("Size: #{deck.size}") | |
end | |
def monitor | |
t = Thread.new do | |
loop do | |
sample | |
sleep 5 | |
end | |
end | |
gets | |
t.kill | |
end | |
def track(id) | |
@current = load_delayed_job(id) | |
@current | |
end | |
def play | |
current.try(:invoke_job) | |
end | |
def rewind | |
current.try(:update_columns, attempts: 0, last_error: 0) | |
end | |
def scratch | |
return unless current | |
info = { | |
handler: YAML.load(current.handler), | |
error: current.last_error.split("\n")[0..4] | |
} | |
log(info) | |
end | |
def eject | |
return unless current | |
current.delete | |
deck.delete_if { |t| t[0] == current.id } | |
@current = nil | |
end | |
def eject_all | |
log 'Are you sure you want to eject all your desk? (y/n)' | |
confirm = gets | |
return log('Phew!') unless confirm[0] == "y" | |
ids = deck.map { |j| j[0] } | |
Delayed::Job.where(id: ids).delete_all | |
log('Boom!') | |
end | |
private | |
def fetch_deck | |
Delayed::Job.order(attempts: :desc, created_at: :desc).pluck(:id, :queue, :attempts) | |
end | |
def load_delayed_job(id) | |
Delayed::Job.find(id) | |
rescue ActiveRecord::RecordNotFound => e | |
log('Not found!') | |
nil | |
end | |
def log(msg) | |
pp(msg);0 | |
end | |
end |
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