Class: Deployer

Inherits:
Object
  • Object
show all
Defined in:
lib/deployer.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(root = nil) ⇒ Deployer 



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# File 'lib/deployer.rb', line 27

def initialize(root = nil)
  @specs = {}
  @root = root || Dir.pwd
  load_config
  self.branch = default_branch
end

Instance Attribute Details

#branch ⇒ Object

Returns the value of attribute branch.



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# File 'lib/deployer.rb', line 13

def branch
  @branch
end

#commit ⇒ Object (readonly)

Returns the value of attribute commit.



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# File 'lib/deployer.rb', line 13

def commit
  @commit
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/deployer.rb', line 12

def config
  @config
end

#image_tag ⇒ Object (readonly)

Returns the value of attribute image_tag.



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# File 'lib/deployer.rb', line 13

def image_tag
  @image_tag
end

#root ⇒ Object (readonly)

Returns the value of attribute root.



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# File 'lib/deployer.rb', line 12

def root
  @root
end

#spec_dir ⇒ Object

Returns the value of attribute spec_dir.



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# File 'lib/deployer.rb', line 14

def spec_dir
  @spec_dir
end

Class Method Details

.docker ⇒ Object 



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# File 'lib/deployer.rb', line 19

def self.docker
  @docker_path ||= File.which('docker') || File.which('podman')
end

.podman? ⇒ Boolean 



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# File 'lib/deployer.rb', line 23

def self.podman?
  docker.include?('podman')
end

Instance Method Details

#deploy!(context) ⇒ Object 



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# File 'lib/deployer.rb', line 85

def deploy!(context)
  context = (context || default_context).to_s
  specs = deploy_specs(context).presence  or raise "No kubernetes specs to deploy"
  stdout, stderr, _success = kubectl(context, 'apply -f -', YAML.dump_stream(*specs))
  puts stdout  if stdout.present?
  puts stderr  if stderr.present?
  notify!(context)
end

#deploy_specs(context = nil) ⇒ Object 



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# File 'lib/deployer.rb', line 94

def deploy_specs(context = nil)
  dspecs = []
  specs(context).deep_dup.each do |spec|
    containers =
      Array(spec.dig('spec', 'template', 'spec', 'containers')) +                       # deployments/statefulsets
      Array(spec.dig('spec', 'jobTemplate', 'spec', 'template', 'spec', 'containers'))  # cronjobs

    containers.each do |container|
      image = images.detect { |image|  image.remote_repo == container['image'] }
      if image
        container['image'] = image.remote_image
        dspecs << spec  unless dspecs.include?(spec)
      elsif !container['image'].include?(':')
        raise "Unknown image #{container['image']}"
      end
    end
  end
  dspecs
end

#kubectl(context, cmd, data = nil) ⇒ Object 



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# File 'lib/deployer.rb', line 124

def kubectl(context, cmd, data = nil)
  cmd = "kubectl --context #{context} #{cmd}"

  if ssh_host.blank?
    stdout, stderr, cmd_status = Open3.capture3(cmd, stdin_data: data)
    [ stdout, stderr, cmd_status.success? ]
  else
    require 'net/ssh'
    exit_code = -1
    stdout = String.new
    stderr = String.new

    ssh = Net::SSH.start(ssh_host)
    ssh.open_channel do |channel|
      channel.exec(cmd) do |_ch, success|
        success or raise "FAILED: couldn't execute command on #{ssh_host}: #{cmd.inspect}"
        channel.on_data { |_ch, in_data|  stdout << in_data }
        channel.on_extended_data { |_ch, _type, in_data|  stderr << in_data }
        channel.on_request('exit-status') { |_ch, in_data|  exit_code = in_data.read_long }
        channel.send_data(data)  if data
        channel.eof!
      end
    end
    ssh.loop
    [ stdout, stderr, exit_code.zero? ]
  end
end

#specs(context = nil) ⇒ Object 



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# File 'lib/deployer.rb', line 114

def specs(context = nil)
  spec_dir = self.spec_dir.presence || (context || default_context).to_s
  @specs[spec_dir] ||= begin
    spec_dir = "platform/#{spec_dir}/"
    paths = git.ls_tree(commit, spec_dir)['blob'].keys
    raise "No specs found in #{spec_dir}"  unless paths.present?
    paths.map { |path| YAML.load_stream( git.show(commit, path) ) }.flatten.compact
  end
end

#specs_running(context = nil) ⇒ Object 



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# File 'lib/deployer.rb', line 47

def specs_running(context = nil)
  context = (context || default_context).to_s
  specs = deploy_specs(context)

  cmd = String.new "--output=json"
  if (namespace = specs.first.dig('metadata', 'namespace'))
    cmd += " --namespace #{namespace}"
  end
  cmd += " get"
  specs.each do |spec|
    cmd += " #{spec['kind'].downcase}/#{spec.dig('metadata', 'name')}"
  end

  statuses, stderr, success = kubectl(context, cmd)
  unless (success || stderr.match(/not found/)) && statuses.present?
    puts stderr  if stderr.present?
    return nil
  end

  spec_status = specs.map { |spec|  [ spec, nil ] }.to_h
  statuses = JSON.parse(statuses)
  statuses = statuses['items']  if statuses.key?('items')
  Array.wrap(statuses).each do |item|
    containers = Array(item.dig('spec', 'template', 'spec', 'containers')) +
                 Array(item.dig('spec', 'jobTemplate', 'spec', 'template', 'spec', 'containers'))
    version = containers.first['image'].split(':').last               # FIXME: support multiple containers
    status = item.delete('status').with_indifferent_access

    spec = specs.detect do |s|
      (item['kind'] == s['kind']) &&
      (item.dig('metadata', 'name') == s.dig('metadata', 'name')) &&
      (item.dig('metadata', 'namespace') == (s.dig('metadata', 'namespace') || 'default'))
    end
    spec_status[spec] = { spec: item, version: version, status: status }
  end
  spec_status
end