Class: Riemann::Tools::ConsulHealth

Inherits:
Object
  • Object
show all
Includes:
Riemann::Tools
Defined in:
lib/riemann/tools/consul_health.rb

Constant Summary

Constants included from Riemann::Tools

VERSION

Instance Attribute Summary

Attributes included from Riemann::Tools

#argv

Instance Method Summary collapse

Methods included from Riemann::Tools

#attributes, #endpoint_name, included, #options, #report, #riemann, #run

Constructor Details

#initialize ⇒ ConsulHealth

Returns a new instance of ConsulHealth.



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# File 'lib/riemann/tools/consul_health.rb', line 22

def initialize
  super

  @hostname = opts[:consul_host]
  @prefix = opts[:prefix]
  @minimum_services_per_node = opts[:minimum_services_per_node]
  @underlying_ip = IPSocket.getaddress(@hostname)
  @consul_leader_url = URI.parse("http://#{opts[:consul_host]}:#{opts[:consul_port]}/v1/status/leader")
  @consul_services_url = URI.parse("http://#{opts[:consul_host]}:#{opts[:consul_port]}/v1/catalog/services")
  @consul_nodes_url = URI.parse("http://#{opts[:consul_host]}:#{opts[:consul_port]}/v1/catalog/nodes")
  @consul_health_url_prefix = "http://#{opts[:consul_host]}:#{opts[:consul_port]}/v1/health/service/"

  @last_services_read = {}
end

Instance Method Details

#alert(hostname, service, state, metric, description) ⇒ Object 



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# File 'lib/riemann/tools/consul_health.rb', line 37

def alert(hostname, service, state, metric, description)
  opts = {
    host: hostname,
    service: service.to_s,
    state: state.to_s,
    metric: metric,
    description: description,
  }

  report(opts)
end

#get(url) ⇒ Object 



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# File 'lib/riemann/tools/consul_health.rb', line 49

def get(url)
  ::Net::HTTP.new(url.host, url.port).get(url, { 'user-agent' => opts[:user_agent] }).body
end

#tick ⇒ Object 



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# File 'lib/riemann/tools/consul_health.rb', line 53

def tick
  leader = JSON.parse(get(@consul_leader_url))
  leader_hostname = URI.parse("http://#{leader}").hostname

  return unless leader_hostname == @underlying_ip

  nodes = JSON.parse(get(@consul_nodes_url))
  services = JSON.parse(get(@consul_services_url))
  services_by_nodes = {}

  nodes.each do |node|
    node_name = node['Node']
    services_by_nodes[node_name] = 0
  end

  # For every service
  services.each do |service|
    service_name = service[0]
    health_url = URI.parse(@consul_health_url_prefix + service_name)
    health_nodes = JSON.parse(get(health_url))

    total_count = 0
    ok_count = 0

    health_nodes.each do |node|
      hostname = node['Node']['Node']
      ok = node['Checks'].all? { |check| check['Status'] == 'passing' }
      alert(hostname, "#{@prefix}#{service_name}", ok ? :ok : :critical, ok ? 1 : 0, JSON.generate(node))
      total_count += 1
      ok_count += ok ? 1 : 0

      last_services_by_nodes = services_by_nodes[hostname].to_i
      services_by_nodes[hostname] = last_services_by_nodes + 1
    end

    unless @last_services_read[service_name].nil?
      last_ok = @last_services_read[service_name]
      if last_ok != ok_count
        alert(
          'total', "#{@prefix}#{service_name}-count", ok_count >= last_ok ? :ok : :critical, ok_count,
          "Number of passing #{service_name} is: #{ok_count}/#{total_count}, Last time it was: #{last_ok}",
        )
      end
    end

    @last_services_read[service_name] = ok_count
  end

  # For every node
  services_by_nodes.each do |node, count|
    alert(
      node, "#{@prefix}total-services", count >= @minimum_services_per_node ? :ok : :critical, count,
      "#{count} services in the specified node",
    )
  end
end