Class: Docker::Compose::Session

Inherits:
Object
  • Object
show all
Defined in:
lib/docker/compose/session.rb

Overview

A Ruby OOP interface to a docker-compose session. A session is bound to a particular directory and docker-compose file (which are set at initialize time) and invokes whichever docker-compose command is resident in $PATH.

Run docker-compose commands by calling instance methods of this class and passing kwargs that are equivalent to the CLI options you would pass to the command-line tool.

Note that the Ruby command methods usually expose a subset of the options allowed by the docker-compose CLI, and that options are sometimes renamed for clarity, e.g. the “-d” flag always becomes the “detached:” kwarg.

Constant Summary collapse

ANSI =

A Regex that matches all ANSI escape sequences.

/\033\[([0-9];?)+[a-z]/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(shell = Backticks::Runner.new(buffered: [:stderr], interactive: true), dir: Dir.pwd, file: 'docker-compose.yml') ⇒ Session

Returns a new instance of Session.



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# File 'lib/docker/compose/session.rb', line 27

def initialize(shell = Backticks::Runner.new(buffered: [:stderr], interactive: true),
               dir: Dir.pwd, file: 'docker-compose.yml')
  @shell = shell
  @dir = dir
  @file = file
end

Instance Attribute Details

#dir ⇒ Object (readonly)

Working directory (determines compose project name); default is Dir.pwd



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# File 'lib/docker/compose/session.rb', line 22

def dir
  @dir
end

#file ⇒ Object (readonly)

Project file; default is ‘docker-compose.yml’



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# File 'lib/docker/compose/session.rb', line 25

def file
  @file
end

Instance Method Details

#build(*services, force_rm: false, no_cache: false, pull: false) ⇒ Object 



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# File 'lib/docker/compose/session.rb', line 215

def build(*services, force_rm: false, no_cache: false, pull: false)
  o = opts(force_rm: [force_rm, false],
           no_cache: [no_cache, false],
           pull: [pull, false])
  result = run!('build', o, services)
end

#config(*args) ⇒ Hash

Validate docker-compose file and return it as Hash

Returns:

  • (Hash) —

    the docker-compose config file

Raises:

  • (Error) —

    if command fails



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# File 'lib/docker/compose/session.rb', line 37

def config(*args)
  config = run!('config', *args)
  YAML.load(config)
end

#down ⇒ Object

Take the stack down



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# File 'lib/docker/compose/session.rb', line 100

def down
  run!('down')
end

#kill(*services, signal: 'KILL') ⇒ Object

Forcibly stop running services.

Parameters:

  • services (Array) —

    list of String service names to stop

  • name (String) —

    of murderous signal to use, default is ‘KILL’

See Also:

  • for a list of acceptable signal names


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# File 'lib/docker/compose/session.rb', line 163

def kill(*services, signal: 'KILL')
  o = opts(signal: [signal, 'KILL'])
  run!('kill', o, services)
end

#logs(*services) ⇒ true

Monitor the logs of one or more containers.

Parameters:

  • services (Array) —

    list of String service names to show logs for

Returns:

  • (true) —

    always returns true

Raises:

  • (Error) —

    if command fails



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# File 'lib/docker/compose/session.rb', line 46

def logs(*services)
  run!('logs', services)
  true
end

#pause(*services) ⇒ Object

Pause running services.

Parameters:

  • services (Array) —

    list of String service names to run



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# File 'lib/docker/compose/session.rb', line 140

def pause(*services)
  run!('pause', *services)
end

#port(service, port, protocol: 'tcp', index: 1) ⇒ String?

Figure out which interface(s) and port a given service port has been published to.

NOTE: if Docker Compose is communicating with a remote Docker host, this method returns IP addresses from the point of view of that host and its interfaces. If you need to know the address as reachable from localhost, you probably want to use ‘Mapper`.

Parameters:

  • service (String) —

    name of service from docker-compose.yml

  • port (Integer) —

    number of port

  • protocol (String) (defaults to: 'tcp') —

    ‘tcp’ or ‘udp’

  • index (Integer) (defaults to: 1) —

    of container (if multiple instances running)

Returns:

  • (String, nil) —

    an ip:port pair such as “0.0.0.0:32176” or nil if the service is not running

Raises:

  • (Error) —

    if command fails

See Also:



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# File 'lib/docker/compose/session.rb', line 183

def port(service, port, protocol: 'tcp', index: 1)
  inter = @shell.interactive
  @shell.interactive = false

  o = opts(protocol: [protocol, 'tcp'], index: [index, 1])
  s = strip_ansi(run!('port', o, service, port).strip)
  (!s.empty? && s) || nil
ensure
  @shell.interactive = inter
end

#ps(*services) ⇒ Object 



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# File 'lib/docker/compose/session.rb', line 51

def ps(*services)
  inter = @shell.interactive
  @shell.interactive = false

  lines = run!('ps', {q: true}, services).split(/[\r\n]+/)
  containers = Collection.new

  lines.each do |id|
    containers << docker_ps(strip_ansi(id))
  end

  containers
ensure
  @shell.interactive = inter
end

#pull(*services) ⇒ Object

Pull images of services

Parameters:

  • services (Array) —

    list of String service names to pull



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# File 'lib/docker/compose/session.rb', line 106

def pull(*services)
  run!('pull', *services)
end

#restart(*services, timeout: 10) ⇒ Object 



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# File 'lib/docker/compose/session.rb', line 133

def restart(*services, timeout:10)
  o = opts(timeout: [timeout, 10])
  run!('restart', o, *services)
end

#rm(*services, force: false, volumes: false) ⇒ Object 



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# File 'lib/docker/compose/session.rb', line 110

def rm(*services, force: false, volumes: false)
  o = opts(f: [force, false], v: [volumes, false])
  run!('rm', o, services)
end

#run(service, *cmd, detached: false, no_deps: false, env: [], rm: false, no_tty: false, user: nil) ⇒ Object

Idempotently run an arbitrary command with a service container.

Parameters:

  • service (String) —

    name to run

  • cmd (String) —

    command statement to run

  • detached (Boolean) (defaults to: false) —

    if true, to start services in the background; otherwise, monitor logs in the foreground and shutdown on Ctrl+C

  • no_deps (Boolean) (defaults to: false) —

    if true, just run specified services without running the services that they depend on

  • env (Array) (defaults to: []) —

    a list of environment variables (see: -e flag)

  • rm (Boolean) (defaults to: false) —

    remove the container when done

  • no_tty (Boolean) (defaults to: false) —

    disable pseudo-tty allocation (see: -T flag)

  • user (String) (defaults to: nil) —

    run as specified username or uid (see: -u flag)

Raises:

  • (Error) —

    if command fails



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# File 'lib/docker/compose/session.rb', line 127

def run(service, *cmd, detached: false, no_deps: false, env: [], rm: false, no_tty: false, user: nil)
  o = opts(d: [detached, false], no_deps: [no_deps, false], rm: [rm, false], T: [no_tty, false], u: [user, nil])
  env_params = env.map { |v| { e: v } }
  run!('run', o, *env_params, service, cmd)
end

#run!(*args) ⇒ String

Run a docker-compose command without validating that the CLI parameters make sense. Prepend project and file options if suitable.

Parameters:

  • args (Array) —

    command-line arguments in the format accepted by Backticks::Runner#command

Returns:

  • (String) —

    output of the command

Raises:

  • (Error) —

    if command fails

See Also:

  • Docker::Compose::Shell#command


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# File 'lib/docker/compose/session.rb', line 231

def run!(*args)
  file_args = case @file
  when 'docker-compose.yml'
    []
  when Array
    # backticks sugar can't handle array values; build a list of hashes
    # IMPORTANT: preserve the order of the files so overrides work correctly
    file_args = @file.map { |filepath| { :file => filepath } }
  else
    # a single String (or Pathname, etc); use normal sugar to add it
    [{ file: @file.to_s }]
  end

  @shell.chdir = dir
  cmd = @shell.run('docker-compose', *file_args, *args).join
  status = cmd.status
  out = cmd.captured_output
  err = cmd.captured_error
  status.success? || fail(Error.new(args.first, status, out+err))
  out
end

#scale(container_count, timeout: 10) ⇒ Object

Idempotently scales the number of containers for given services in the project.

Parameters:

  • container_count (Hash) —

    per service, e.g. 2, worker: 3

  • timeout (Integer) (defaults to: 10) —

    how long to wait for each service to scale



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# File 'lib/docker/compose/session.rb', line 93

def scale(container_count, timeout: 10)
  args = container_count.map {|service, count| "#{service}=#{count}"}
  o = opts(timeout: [timeout, 10])
  run!('scale', o, *args)
end

#stop(*services, timeout: 10) ⇒ Object

Stop running services.

Parameters:

  • services (Array) —

    list of String service names to stop

  • timeout (Integer) (defaults to: 10) —

    how long to wait for each service to stop

Raises:

  • (Error) —

    if command fails



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# File 'lib/docker/compose/session.rb', line 154

def stop(*services, timeout: 10)
  o = opts(timeout: [timeout, 10])
  run!('stop', o, services)
end

#unpause(*services) ⇒ Object

Unpause running services.

Parameters:

  • services (Array) —

    list of String service names to run



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# File 'lib/docker/compose/session.rb', line 146

def unpause(*services)
  run!('unpause', *services)
end

#up(*services, detached: false, timeout: 10, build: false, no_build: false, no_deps: false) ⇒ true

Idempotently up the given services in the project.

Parameters:

  • services (Array) —

    list of String service names to run

  • detached (Boolean) (defaults to: false) —

    if true, to start services in the background; otherwise, monitor logs in the foreground and shutdown on Ctrl+C

  • timeout (Integer) (defaults to: 10) —

    how long to wait for each service to start

  • build (Boolean) (defaults to: false) —

    if true, build images before starting containers

  • no_build (Boolean) (defaults to: false) —

    if true, don’t build images, even if they’re missing

  • no_deps (Boolean) (defaults to: false) —

    if true, just run specified services without running the services that they depend on

Returns:

  • (true) —

    always returns true

Raises:

  • (Error) —

    if command fails



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# File 'lib/docker/compose/session.rb', line 79

def up(*services,
       detached: false, timeout: 10, build: false, no_build: false, no_deps: false)
  o = opts(d: [detached, false],
           timeout: [timeout, 10],
           build: [build, false],
           no_build: [no_build, false],
           no_deps: [no_deps, false])
  run!('up', o, services)
  true
end

#version(short: false) ⇒ String, Hash

Determine the installed version of docker-compose.

Parameters:

  • short (Boolean) (defaults to: false) —

    whether to return terse version information

Returns:

  • (String, Hash) —

    if short==true, returns a version string; otherwise, returns a Hash of component-name strings to version strings

Raises:

  • (Error) —

    if command fails



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# File 'lib/docker/compose/session.rb', line 199

def version(short: false)
  o = opts(short: [short, false])
  result = run!('version', o, file: false, dir: false)

  if short
    result.strip
  else
    lines = result.split(/[\r\n]+/)
    lines.inject({}) do |h, line|
      kv = line.split(/: +/, 2)
      h[kv.first] = kv.last
      h
    end
  end
end