Class: Lusnoc::Watcher

Inherits:
Object
  • Object
show all
Includes:
Helper
Defined in:
lib/lusnoc/watcher.rb

Instance Method Summary collapse

Methods included from Helper

#build_url, #logger

Constructor Details

#initialize(base_url, timeout: 0, eclass: Lusnoc::TimeoutError, emessage: 'watch timeout') ⇒ Watcher

Returns a new instance of Watcher.



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# File 'lib/lusnoc/watcher.rb', line 10

def initialize(base_url,
               timeout: 0,
               eclass: Lusnoc::TimeoutError,
               emessage: 'watch timeout')
  @base_url = base_url
  @timeout  = timeout
  @eclass   = eclass
  @emessage = emessage
end

Instance Method Details

#build_wait_condition(_url, time_left, max_consul_wait) ⇒ Object 



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# File 'lib/lusnoc/watcher.rb', line 41

def build_wait_condition(_url, time_left, max_consul_wait)
  if time_left
    max = [time_left.to_i, max_consul_wait.to_i].max
    "&wait=#{max}s"
  elsif max_consul_wait
    "&wait=#{max_consul_wait.to_i}s"
  else
    ''
  end
end

#run(max_consul_wait: nil) ⇒ Object

run Consul blocking request in a loop with timeout support. break condition yielded by block call with response body



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# File 'lib/lusnoc/watcher.rb', line 22

def run(max_consul_wait: nil)
  logger.debug "Watch #{@base_url} with #{@timeout.inspect} timeout"
  last_x_consul_index = 1

  Timeouter.loop!(@timeout, eclass: @eclass, message: @emessage) do |t|
    wait_condition = build_wait_condition(@base_url, t.left, max_consul_wait)
    url = "#{@base_url}?index=#{last_x_consul_index}#{wait_condition}"

    resp = Lusnoc.http_get(url, timeout: t.left)
    return true if yield(resp.body)

    logger.debug "Watch #{@base_url} response: #{resp.body}"

    index = [Integer(resp['x-consul-index']), 1].max
    last_x_consul_index = (index < last_x_consul_index ? 1 : index)
    sleep 0.4
  end
end