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413
src/main.cr
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413
src/main.cr
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require "option_parser"
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require "yaml"
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# TODO:
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# - Be more declarative about the definition of commands.
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def split_command(string)
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args = string.split /\ (?=([^\"]*\"[^\"]*\")*[^\"]*$)/
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command = args[0]
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args.delete_at 0
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return command, args
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end
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class ServiceDefinition
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struct Consumes
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YAML.mapping({
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token: String,
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optional: {
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type: Bool,
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default: false
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}
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})
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end
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struct Provides
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YAML.mapping({
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token: String
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})
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end
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YAML.mapping({
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name: String,
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command: String,
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stop_command: {
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type: String?,
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key: "stop-command"
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},
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directory: String?, # Place to chdir to before running @command.
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environment: {
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type: Environment,
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default: Environment.root
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},
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provides: {
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type: Array(Provides),
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default: [] of Provides
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},
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consumes: {
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type: Array(Consumes),
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default: [] of Consumes
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}
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})
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def self.new(name)
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Service.from_yaml File.read "#{name}.yaml"
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end
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class_getter all = [] of ServiceDefinition
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def self.load(path)
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Dir.each_child path do |child|
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unless child.match /\.yaml$/
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next
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end
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@@all << ServiceDefinition.from_yaml File.read "#{path}/#{child}"
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end
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end
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def self.get(name) : ServiceDefinition
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_def = @@all.find &.name.==(name)
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if _def.nil?
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raise Exception.new "Service '#{name}' does not exist."
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end
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_def
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end
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def to_s
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name
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end
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end
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class Environment
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enum Type
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Native
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RootFileSystem
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end
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YAML.mapping({
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name: String,
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type: {
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type: Type,
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default: Type::Native
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},
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domain_name: {
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type: String?,
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key: "domain-name"
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}
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})
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def initialize()
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@name = "root"
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@type = Type::Native
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end
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class_getter root = Environment.new
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class_getter all = [@@root] of Environment
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def self.load(path)
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Dir.each_child path do |child|
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unless child.match /\.yaml$/
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next
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end
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@@all << Environment.from_yaml File.read "#{path}/#{child}"
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end
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end
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def self.get(name)
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_def = @@all.find &.name.==(name)
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if _def.nil?
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raise Exception.new "Environment '#{name}' does not exist."
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end
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_def
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end
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def to_s
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"#{name} (#{type.to_s.downcase})"
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end
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end
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class Service
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getter environment : Environment
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getter providers = ProvidersList.new
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class ProvidersList < Hash(String, String)
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def []?(name)
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super(name).try { |x| Service.get_by_id x}
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end
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end
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struct AsYAML
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YAML.mapping({
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name: String,
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environment: String,
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consumes: {
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type: Array(YAMLConsumes),
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default: [] of YAMLConsumes
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}
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})
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end
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struct YAMLConsumes
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YAML.mapping({
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token: String,
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from: String
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})
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end
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def initialize(name, environment_name : String?, @consumes = [] of YAMLConsumes)
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@reference = ServiceDefinition.get name
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@environment = if environment_name.nil? || environment_name == ""
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Environment.root
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else
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Environment.get environment_name
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end
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consumes.map do |consume|
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@providers[consume.token] = consume.from
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end
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end
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def self.from_yaml(yaml)
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yaml = AsYAML.from_yaml yaml
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self.new yaml.name, yaml.environment, yaml.consumes
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end
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def to_yaml
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{
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name: name,
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environment: @environment.name
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}.to_yaml
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end
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# FIXME: At this point, macros would be both more readable and shorter.
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def name
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@reference.name
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end
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def type
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@reference.type
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end
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def command
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@reference.command
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end
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def stop_command
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@reference.stop_command
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end
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def provides
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@reference.provides
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end
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def start(log_dir : String)
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command, args = split_command command
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process = Process.fork do
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base_log_name = "#{log_dir}/#{name}.#{@environment.name}"
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stdout_file = File.open "#{base_log_name}.out", "w"
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stderr_file = File.open "#{base_log_name}.err", "w"
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LibC.dup2 stdout_file.fd, 1
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LibC.dup2 stderr_file.fd, 2
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Process.exec command, args, chdir: @reference.directory
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end
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self.pid = process.pid
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end
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# TODO:
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# - Custom shutdown commands.
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# - Should we wait for the process to die?
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def stop
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_pid = pid
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if _pid
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command = stop_command
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if command
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command, args = split_command command
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Process.run(command, args)
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else
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Process.kill Signal::TERM, _pid
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end
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else
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# Already stopped or dead, nothing to be done here.
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end
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end
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def get_pid_file
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"#{name}.pid"
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end
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def pid
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File.read(get_pid_file).to_i
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rescue e # pid file missing, corrupted or otherwise not readable
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nil
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end
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def pid=(new_pid)
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File.write get_pid_file, new_pid
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end
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enum Status
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Running
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Dead
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Stopped
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end
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def status
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_pid = pid
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if _pid
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if Process.exists? _pid
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Status::Running
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else
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Status::Dead
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end
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else
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Status::Stopped
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end
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end
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def to_s
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"#{name} (in #{@environment.name})"
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end
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def summary
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"Name: #{name}\n" +
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"Environment: #{environment.name} (#{environment.type.to_s.downcase})\n" +
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"Provides:\n" +
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(provides.map { |x| " - " + x.token + "\n" }).join +
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"Consumes:\n" +
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(@reference.consumes.map { |x|
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provider = @providers[x.token]?
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if provider
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" - #{x.token} (from #{provider.to_s})\n"
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else
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" - #{x.token} (NOT CURRENTLY PROVIDED)\n"
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end
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}).join
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end
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class_getter all = [] of Service
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def self.load(path)
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Dir.each_child path do |child|
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unless child.match /\.yaml$/
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next
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end
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@@all << Service.from_yaml File.read "#{path}/#{child}"
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end
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end
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def write(path)
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File.write "#{path}/#{name}.#{@environment.name}.yaml", to_yaml
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end
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def remove(path)
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File.delete "#{path}/#{name}.#{@environment.name}.yaml"
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end
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def self.get_by_id(id)
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matches = id.match /[^\/]*/
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unless matches
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raise Exception.new "FIXME"
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end
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environment_name = matches[0]
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service_name = id.sub 0..matches[0].size, ""
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@@all.find do |service|
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service.name == service_name
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end
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end
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end
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args = [] of String
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parser = OptionParser.parse! do |parser|
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parser.banner = "usage: yunoservice <command> [options]\n" +
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"\n" +
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"commands:\n" +
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" start\n" +
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" stop\n" +
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" status\n" +
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" show\n" +
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" add\n" +
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" del\n" +
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" list\n" +
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" list-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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puts parser
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exit 0
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end
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parser.unknown_args do |x|
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args = x
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end
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end
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command = args[0]?
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if command.nil?
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STDERR << parser << "\n"
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exit 1
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end
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ServiceDefinition.load "services"
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Environment.load "environments"
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Service.load "rc"
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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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Service.new(args[1], args[2]?).write "rc"
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elsif args[0] == "del"
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Service.new(args[1], args[2]?).remove "rc"
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elsif args[0] == "start"
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Service.new(args[1], args[2]?).start "log"
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elsif args[0] == "stop"
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Service.new(args[1], args[2]?).stop
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elsif args[0] == "status"
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puts Service.new(args[1], args[2]?).status
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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] == "list"
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Service.all.map do |service|
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puts service.to_s
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end
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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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rescue e
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STDERR << e.message << "\n"
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exit 2
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end
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