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require "docker"
require "yaml" unless defined?(YAML)
require "concurrent"
class DockerRunner
def initialize(conf_path = nil)
@conf_path = conf_path || ENV["config"]
unless File.file?(@conf_path)
raise "Can't find configuration in #{@conf_path}"
end
@conf = YAML.load_file(@conf_path)
if @conf.nil? || @conf.empty?
raise "Can't read configuration in #{@conf_path}"
end
if @conf["images"].nil?
raise "You must configure test images in your #{@conf_path}"
end
@images = docker_images_by_tag
@image_pull_tickets = Concurrent::Semaphore.new(2)
@docker_run_tickets = Concurrent::Semaphore.new(5)
end
def run_all(&block)
raise "You must provide a block for run_all" unless block_given?
promises = @conf["images"].map do |id|
run_on_target(id, &block)
end
# wait for all tests to be finished
sleep(0.1) until promises.all?(&:fulfilled?)
# return resulting values
promises.map(&:value)
end
def run_on_target(name, &block)
pr = Concurrent::Promise.new do
begin
container = start_container(name)
res = yield(name, container)
# special rescue block to handle not implemented error
rescue NotImplementedError => err
raise err.message
end
# always stop the container
stop_container(container)
res
end.execute
# failure handling
pr.rescue do |err|
msg = "\033[31;1m#{err.message}\033[0m"
puts msg
msg + "\n" + err.backtrace.join("\n")
end
end
def provision_image(image, prov, files)
tries ||= 3
return image if prov["script"].nil?
path = File.join(File.dirname(@conf_path), prov["script"])
unless File.file?(path)
puts "Can't find script file #{path}"
return image
end
puts " script #{path}"
dst = "/bootstrap#{files.length}.sh"
files.push(dst)
image.insert_local("localPath" => path, "outputPath" => dst)
rescue StandardError => _
retry unless (tries -= 1) == 0
end
def bootstrap_image(name, image)
files = []
provisions = Array(@conf["provision"])
puts "--> provision docker #{name}" unless provisions.empty?
provisions.each do |prov|
image = provision_image(image, prov, files)
end
[image, files]
end
def start_container(name, version = nil)
unless name.include?(":")
version ||= "latest"
name = "#{name}:#{version}"
end
puts "--> schedule docker #{name}"
image = @images[name]
if image.nil?
puts "\033[35;1m--> pull docker images #{name} "\
"(this may take a while)\033[0m"
@image_pull_tickets.acquire(1)
puts "... start pull image #{name}"
image = Docker::Image.create("fromImage" => name)
@image_pull_tickets.release(1)
unless image.nil?
puts "\033[35;1m--> pull docker images finished for #{name}\033[0m"
end
end
raise "Can't find nor pull docker image #{name}" if image.nil?
@docker_run_tickets.acquire(1)
image, scripts = bootstrap_image(name, image)
puts "--> start docker #{name}"
container = Docker::Container.create(
"Cmd" => %w{sleep 3600},
"Image" => image.id,
"OpenStdin" => true
)
container.start
scripts.each do |script|
container.exec(%w{chmod +x}.push(script))
container.exec(%w{sh -c}.push(script))
end
container
end
def stop_container(container)
@docker_run_tickets.release(1)
puts "--> killrm docker #{container.id}"
container.kill
container.delete(force: true)
end
private
# get all docker image tags
def docker_images_by_tag
images = {}
Docker::Image.all.map do |img|
Array(img.info["RepoTags"]).each do |tag|
images[tag] = img
end
end
images
end
end
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