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 



27
28
29
30
31
32
 
# 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



22
23
24
 
# File 'lib/docker/compose/session.rb', line 22

def dir
  @dir
end

#file ⇒ Object (readonly)

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



25
26
27
 
# 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 



213
214
215
216
217
218
 
# File 'lib/docker/compose/session.rb', line 213

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

Raises:

  • (Error) —

    if command fails



37
38
39
40
 
# 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



100
101
102
 
# File 'lib/docker/compose/session.rb', line 100

def down
  run!('down')
end

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

Forcibly stop running services.

See Also:

  • for a list of acceptable signal names


161
162
163
164
 
# File 'lib/docker/compose/session.rb', line 161

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.

Raises:

  • (Error) —

    if command fails



46
47
48
49
 
# File 'lib/docker/compose/session.rb', line 46

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

#pause(*services) ⇒ Object

Pause running services.



138
139
140
 
# File 'lib/docker/compose/session.rb', line 138

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.

Raises:

  • (Error) —

    if command fails

See Also:



181
182
183
184
185
186
187
188
189
190
 
# File 'lib/docker/compose/session.rb', line 181

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 



51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
 
# 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



106
107
108
 
# File 'lib/docker/compose/session.rb', line 106

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

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



131
132
133
134
 
# File 'lib/docker/compose/session.rb', line 131

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

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



110
111
112
113
 
# 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) ⇒ Object

Idempotently run an arbitrary command with a service container.

Raises:

  • (Error) —

    if command fails



125
126
127
128
129
 
# File 'lib/docker/compose/session.rb', line 125

def run(service, *cmd, detached: false, no_deps: false, env: [], rm: false)
  o = opts(detached: [detached, false], no_deps: [no_deps, false], env: [env, []], rm: [rm, false])
  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.

Raises:

  • (Error) —

    if command fails

See Also:

  • Docker::Compose::Shell#command


229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
 
# File 'lib/docker/compose/session.rb', line 229

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.



93
94
95
96
97
 
# 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.

Raises:

  • (Error) —

    if command fails



152
153
154
155
 
# File 'lib/docker/compose/session.rb', line 152

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

#unpause(*services) ⇒ Object

Unpause running services.



144
145
146
 
# File 'lib/docker/compose/session.rb', line 144

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.

Raises:

  • (Error) —

    if command fails



79
80
81
82
83
84
85
86
87
88
 
# 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.

Raises:

  • (Error) —

    if command fails



197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
 
# File 'lib/docker/compose/session.rb', line 197

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