Class: MobyDerp::Container

Inherits:
Object
  • Object
show all
Includes:
LoggingHelpers
Defined in:
lib/moby_derp/container.rb

Instance Method Summary collapse

Constructor Details

#initialize(pod:, container_config:, root_container: false) ⇒ Container

Returns a new instance of Container.



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# File 'lib/moby_derp/container.rb', line 14

def initialize(pod:, container_config:, root_container: false)
	@logger = pod.logger

	@pod, @config, @root_container = pod, container_config, root_container
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/moby_derp/container.rb', line 20

def run
	container_name = @root_container ? @pod.name : @config.name
	@logger.debug(logloc) { "Calculated container name is #{container_name} (@root_container: #{@root_container.inspect}, @config.name: #{@config.name}, @pod.name: #{@pod.name})" }

	begin
		existing_container = Docker::Container.get(container_name)
		@logger.debug(logloc) { "Config hash for existing container #{container_name} is #{existing_container.info["Config"]["Labels"]["org.hezmatt.moby-derp.config-hash"].inspect}" }
		@logger.debug(logloc) { "New config hash is #{params_hash(container_creation_parameters).inspect}" }

		if existing_container.info["Config"]["Labels"]["org.hezmatt.moby-derp.config-hash"] == params_hash(container_creation_parameters)
			# Container is up-to-date
			@logger.info(logloc) { "Container #{container_name} is up-to-date" }
			@logger.debug(logloc) { "Container #{container_name} has restart=#{@config.restart}, state is #{existing_container.info.dig("State", "Status")}" }

			if @config.restart == "always" && existing_container.info.dig("State", "Status") != "running"
				existing_container.start
			end

			return existing_container.id
		end

		if existing_container.info["Config"]["Labels"]["org.hezmatt.moby-derp.pod-name"] != @pod.name
			raise ContainerError,
			      "container #{container_name} is not tagged as being part of this pod"
		end
		@logger.info(logloc) { "Deleting container #{container_name} (#{existing_container.id[0..11]}) because it is out-of-date" }
		existing_container.delete(force: true)
		@logger.info(logloc) { "Creating new container #{container_name}" }
	rescue Docker::Error::NotFoundError
		@logger.info(logloc) { "Container #{container_name} does not exist; creating it" }
		# Container doesn't exist, need to create it
	end

	begin
		c = Docker::Container.create(hash_labelled(container_creation_parameters))
		c.start!.object_id

		if @config.startup_health_check
			attempts = @config.startup_health_check[:attempts]

			while attempts > 0
				stdout, stderr, exitstatus = c.exec(@config.startup_health_check[:command])
				if exitstatus > 0
					stdout_lines = stdout.empty? ? [] : ["stdout:"] + stdout.join("\n").split("\n").map { |l| "  #{l}" }
					stderr_lines = stderr.empty? ? [] : ["stderr:"] + stderr.join("\n").split("\n").map { |l| "  #{l}" }
					output_lines = stdout_lines + stderr_lines
					@logger.warn(logloc) { "Startup health check failed on #{container_name} with status #{exitstatus}." + (output_lines.empty? ? "" : (["  Output:"] + output_lines.join("\n  "))) }

					attempts -= 1
					sleep @config.startup_health_check[:interval]
				else
					@logger.info(logloc) { "Startup health check passed." }
					break
				end
			end

			if attempts == 0
				raise MobyDerp::StartupHealthCheckError,
					"Container #{container_name} has failed the startup health check command #{@config.startup_health_check[:attempts]} times.  Aborting."
			end
		end

		c.id
	rescue Docker::Error::ClientError => ex
		raise MobyDerp::ContainerError,
		      "moby daemon returned error: #{ex.message}"
	end
end