Better handling of commands.
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3ca16cfcce
commit
bdeb23c275
308
src/service.cr
308
src/service.cr
@ -13,17 +13,6 @@ args = [] of String
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parser = OptionParser.parse do |parser|
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parser.banner = "usage: service <command> [options]\n" +
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"\n" +
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"commands:\n" +
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" start Starts a stopped or dead service.\n" +
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" stop Stops a running service.\n" +
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" status Shows the current state of a service.\n" +
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" show Describe a service in detail.\n" +
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" add Add a service to an environment.\n" +
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" del Remove a service from an environment.\n" +
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" add-environment Creates a new, empty environment.\n" +
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" list-environments Lists registered environments.\n" +
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"\n" +
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"options:\n"
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parser.on "-h", "--help", "Prints this help message." do
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@ -35,9 +24,177 @@ parser = OptionParser.parse do |parser|
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end
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end
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command = args[0]?
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alias Command = Proc(Array(String), Nil)
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alias CommandTuple = Tuple(String, String, Command)
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class CommandsList
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def initialize
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@commands = Array(CommandTuple).new
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end
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def push(name : String, description : String, &proc : Command)
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@commands << Tuple.new(name, description, proc)
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end
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def find(&block : Proc(CommandTuple, Bool))
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@commands.find do |tuple|
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if block.call tuple
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next true
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end
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end
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end
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def to_s
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"commands:\n\n"+ @commands.map do |tuple|
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" %-32s %s" % [tuple[0], tuple[1]]
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end.join "\n"
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end
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end
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commands = CommandsList.new
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commands.push "add", "Adds a service to an environment." do |args|
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providers = Hash(String, String).new
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environment, service = Service.parse_id args[0]
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args.each_with_index do |arg, i|
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next if i == 0
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match = arg.match /(.*)=(.*)/
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if match.nil?
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raise ::Service::Exception.new "usage: service add <service> <token=provider>"
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next
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end
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providers[match[1]] = match[2]
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end
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Service.new(service, environment).tap do |service|
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service.consumes.each do |token|
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provider = providers[token.token]?
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if provider.nil?
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provider = service.get_default_provider token.token
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end
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if provider.nil?
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STDERR.puts "This service consumes a “#{token.token}” token, but you have not specified what other service is supposed to provide it."
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STDERR.puts "Use the `service add #{args[1]} #{token.token}=<provider>` syntax to specify it."
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exit 1
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end
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service.providers[token.token] = provider
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end
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pp! service.providers
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end.write RC_DIRECTORY
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end
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commands.push "del", "Removes a service from an environment." do |args|
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Service.new(args[0], args[1]?).remove RC_DIRECTORY
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end
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commands.push "start", "Starts a service." do
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services = args.map do |arg|
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service = Service.get_by_id(arg)
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unless service
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raise Service::Exception.new "Service '#{arg}' does not exist."
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end
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service
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end
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services.each do |service|
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service.dependency_tree.flatten.reverse.each do |service|
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next if service.running? PID_DIRECTORY
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puts "starting #{service.to_s}"
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service.start PID_DIRECTORY, LOG_DIRECTORY
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end
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end
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end
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commands.push "stop", "Stops a running service." do |args|
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services = args.map do |arg|
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service = Service.get_by_id(arg)
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unless service
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raise Service::Exception.new "Service '#{arg}' does not exist."
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end
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service
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end
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services.each do |service|
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# FIXME: Build revdep tree and stop services started as dependencies?
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next if ! service.running? PID_DIRECTORY
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# FIXME: Should we remove duplicate services from the
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# tree once flattened?
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service.reverse_dependency_tree.flatten.reverse.each do |service|
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next if ! service.running? PID_DIRECTORY
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puts "stopping #{service.to_s}"
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service.stop PID_DIRECTORY
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end
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end
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end
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commands.push "status", "Prints the status of services." do |args|
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child = Process.run "#{OWN_LIBEXEC_DIR}/status", args,
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output: Process::Redirect::Inherit,
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error: Process::Redirect::Inherit
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return_value = (child.exit_status / 256).to_i
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# Errors not registered here should probably be verbose in `status`.
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if return_value == 1
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STDERR << "No such service.\n"
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end
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exit return_value
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end
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commands.push "show", "Shows a service's configuration and state." do |args|
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service = Service.all.find do |service|
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unless service.name == args[0]
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next false
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end
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env = args[1]? || "root"
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if service.environment.name != env
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next false
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end
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true
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end
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if service
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puts service.summary
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else
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STDERR << "No such service is registered.\n"
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exit 2
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end
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end
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commands.push "add-environment", "Creates a new (empty) environment." do |arg|
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Environment.new(args[9]).write ENVIRONMENTS_DIRECTORY
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end
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commands.push "list-environments", "Lists all currently defined environments.s", do |arg|
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Environment.all.map do |env|
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puts env.to_s
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end
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end
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commands.push "help", "Prints this help message." do
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puts parser
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puts
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puts commands.to_s
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end
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command = commands.find &.[0].==(args[0]?)
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if command.nil?
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STDERR << parser << "\n"
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STDERR << "\n"
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STDERR << commands.to_s << "\n"
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exit 1
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end
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@ -46,131 +203,8 @@ Environment.load ENVIRONMENTS_DIRECTORY
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Service.load RC_DIRECTORY
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begin
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if args[0] == "help"
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puts parser
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elsif args[0] == "add"
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providers = Hash(String, String).new
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environment, service = Service.parse_id args[1]
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args.shift
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args.each_with_index do |arg, i|
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next if i == 0
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match = arg.match /(.*)=(.*)/
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if match.nil?
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raise ::Service::Exception.new "usage: service add <service> <token=provider>"
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next
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end
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providers[match[1]] = match[2]
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end
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Service.new(service, environment).tap do |service|
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service.consumes.each do |token|
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provider = providers[token.token]?
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if provider.nil?
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provider = service.get_default_provider token.token
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end
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if provider.nil?
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STDERR.puts "This service consumes a “#{token.token}” token, but you have not specified what other service is supposed to provide it."
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STDERR.puts "Use the `service add #{args[1]} #{token.token}=<provider>` syntax to specify it."
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exit 1
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end
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service.providers[token.token] = provider
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end
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pp! service.providers
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end.write RC_DIRECTORY
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elsif args[0] == "del"
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Service.new(args[1], args[2]?).remove RC_DIRECTORY
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elsif args[0] == "start"
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services = args[1..args.size].map do |arg|
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service = Service.get_by_id(arg)
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unless service
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raise Service::Exception.new "Service '#{arg}' does not exist."
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end
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service
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end
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services.each do |service|
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service.dependency_tree.flatten.reverse.each do |service|
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next if service.running? PID_DIRECTORY
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puts "starting #{service.to_s}"
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service.start PID_DIRECTORY, LOG_DIRECTORY
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end
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end
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elsif args[0] == "stop"
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services = args[1..args.size].map do |arg|
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service = Service.get_by_id(arg)
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unless service
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raise Service::Exception.new "Service '#{arg}' does not exist."
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end
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service
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end
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services.each do |service|
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# FIXME: Build revdep tree and stop services started as dependencies?
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next if ! service.running? PID_DIRECTORY
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# FIXME: Should we remove duplicate services from the
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# tree once flattened?
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service.reverse_dependency_tree.flatten.reverse.each do |service|
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next if ! service.running? PID_DIRECTORY
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puts "stopping #{service.to_s}"
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service.stop PID_DIRECTORY
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end
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end
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elsif args[0] == "status"
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args.shift
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child = Process.run "#{OWN_LIBEXEC_DIR}/status", args,
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output: Process::Redirect::Inherit,
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error: Process::Redirect::Inherit
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return_value = (child.exit_status / 256).to_i
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# Errors not registered here should probably be verbose in `status`.
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if return_value == 1
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STDERR << "No such service.\n"
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end
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exit return_value
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elsif args[0] == "show"
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service = Service.all.find do |service|
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unless service.name == args[1]
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next false
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end
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env = args[2]? || "root"
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if service.environment.name != env
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next false
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end
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true
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end
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if service
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puts service.summary
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else
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STDERR << "No such service is registered.\n"
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exit 2
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end
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elsif args[0] == "add-environment"
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Environment.new(args[1]).write ENVIRONMENTS_DIRECTORY
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elsif args[0] == "list-environments"
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Environment.all.map do |env|
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puts env.to_s
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end
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else
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STDERR << parser << "\n"
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exit 1
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end
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args.shift
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command.[2].call(args)
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rescue e : Service::Exception
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STDERR << e.message << "\n"
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exit 2
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