Module: Einhorn
- Defined in:
- lib/einhorn.rb,
lib/einhorn/event.rb,
lib/einhorn/third.rb,
lib/einhorn/client.rb,
lib/einhorn/compat.rb,
lib/einhorn/worker.rb,
lib/einhorn/command.rb,
lib/einhorn/version.rb,
lib/einhorn/worker_pool.rb
Defined Under Namespace
Modules: AbstractState, Command, Compat, Event, State, Third, TransientState, Worker, WorkerPool
Classes: Client
Constant Summary
collapse
- VERSION =
'0.7.4'
Class Method Summary
collapse
-
.bind(addr, port, flags) ⇒ Object
-
.can_safely_reload? ⇒ Boolean
Returns true if a reload of the einhorn master via re-execing is not likely to be completely unsafe (that is, the new process’s environment won’t prevent it from loading its code on exec).
-
.dump_environment_info ⇒ Object
Log info about the environment as observed by ruby on startup.
-
.initialize_reload_environment ⇒ Object
Set up the environment for reloading the einhorn master: 1.
-
.is_script(file) ⇒ Object
Not really a thing, but whatever.
-
.log_debug(msg, tag = nil) ⇒ Object
Implement these ourselves so it plays nicely with state persistence.
-
.log_error(msg, tag = nil) ⇒ Object
-
.log_info(msg, tag = nil) ⇒ Object
-
.master_ps_name ⇒ Object
-
.preload ⇒ Object
-
.print_state ⇒ Object
-
.renice_self ⇒ Object
-
.restore_state(state) ⇒ Object
-
.run ⇒ Object
-
.send_tagged_message(tag, message, last = false) ⇒ Object
-
.set_argv(cmd, set_ps_name) ⇒ Object
-
.set_master_ps_name ⇒ Object
-
.socketify!(cmd) ⇒ Object
This duplicates some code from the environment path, but is deprecated so that’s ok.
-
.socketify_env! ⇒ Object
-
.update_state(store, store_name, old_state) ⇒ Object
-
.upgrade_commandline(einhorn_flags = []) ⇒ Object
Construct and a command and args that can be used to re-exec Einhorn for upgrades.
-
.which(cmd) ⇒ Object
-
.worker_ps_name ⇒ Object
Class Method Details
.bind(addr, port, flags) ⇒ Object
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# File 'lib/einhorn.rb', line 147
def self.bind(addr, port, flags)
log_info("Binding to #{addr}:#{port} with flags #{flags.inspect}")
sd = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
Einhorn::Compat.cloexec!(sd, false)
if flags.include?('r') || flags.include?('so_reuseaddr')
sd.setsockopt(Socket::SOL_SOCKET, Socket::SO_REUSEADDR, 1)
end
sd.bind(Socket.pack_sockaddr_in(port, addr))
sd.listen(Einhorn::State.config[:backlog])
if flags.include?('n') || flags.include?('o_nonblock')
fl = sd.fcntl(Fcntl::F_GETFL)
sd.fcntl(Fcntl::F_SETFL, fl | Fcntl::O_NONBLOCK)
end
Einhorn::TransientState.socket_handles << sd
sd.fileno
end
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.can_safely_reload? ⇒ Boolean
Returns true if a reload of the einhorn master via re-execing is not likely to be completely unsafe (that is, the new process’s environment won’t prevent it from loading its code on exec).
.dump_environment_info ⇒ Object
Log info about the environment as observed by ruby on startup. Currently, this means the bundler and rbenv versions.
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# File 'lib/einhorn.rb', line 375
def self.dump_environment_info
log_info("Running under Ruby #{RUBY_VERSION}", :environment)
log_info("Rbenv ruby version: #{ENV['RBENV_VERSION']}", :environment) if ENV['RBENV_VERSION']
begin
bundler_gem = Gem::Specification.find_by_name('bundler')
log_info("Using Bundler #{bundler_gem.version.to_s}", :environment)
rescue Gem::LoadError
end
end
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.initialize_reload_environment ⇒ Object
Set up the environment for reloading the einhorn master:
-
Clear the current process’s environment,
-
Set it to the environmment at startup
-
Delete all variables marked to be dropped via ‘–drop-env-var`
This method is safe to call in the master only before ‘exec`ing something.
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# File 'lib/einhorn.rb', line 365
def self.initialize_reload_environment
ENV.clear
ENV.update(Einhorn::TransientState.environ)
Einhorn::State.drop_environment_variables.each do |var|
ENV.delete(var)
end
end
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.is_script(file) ⇒ Object
Not really a thing, but whatever.
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# File 'lib/einhorn.rb', line 217
def self.is_script(file)
File.open(file) do |f|
bytes = f.read(2)
bytes == '#!'
end
end
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.log_debug(msg, tag = nil) ⇒ Object
Implement these ourselves so it plays nicely with state persistence
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# File 'lib/einhorn.rb', line 169
def self.log_debug(msg, tag=nil)
$stderr.puts("#{log_tag} DEBUG: #{msg}\n") if Einhorn::State.verbosity <= 0
self.send_tagged_message(tag, msg) if tag
end
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.log_error(msg, tag = nil) ⇒ Object
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# File 'lib/einhorn.rb', line 177
def self.log_error(msg, tag=nil)
$stderr.puts("#{log_tag} ERROR: #{msg}\n") if Einhorn::State.verbosity <= 2
self.send_tagged_message(tag, "ERROR: #{msg}") if tag
end
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.log_info(msg, tag = nil) ⇒ Object
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# File 'lib/einhorn.rb', line 173
def self.log_info(msg, tag=nil)
$stderr.puts("#{log_tag} INFO: #{msg}\n") if Einhorn::State.verbosity <= 1
self.send_tagged_message(tag, msg) if tag
end
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.master_ps_name ⇒ Object
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# File 'lib/einhorn.rb', line 278
def self.master_ps_name
"einhorn: #{worker_ps_name}"
end
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.preload ⇒ Object
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# File 'lib/einhorn.rb', line 224
def self.preload
if path = Einhorn::State.path
set_argv(Einhorn::State.cmd, false)
begin
if !path.end_with?('.rb') && File.exists?(path)
log_info("Loading #{path} (if this hangs, make sure your code can be properly loaded as a library)", :upgrade)
load path
else
log_info("Requiring #{path} (if this hangs, make sure your code can be properly loaded as a library)", :upgrade)
require path
end
rescue Exception => e
log_info("Proceeding with postload -- could not load #{path}: #{e} (#{e.class})\n #{e.backtrace.join("\n ")}", :upgrade)
else
if defined?(einhorn_main)
log_info("Successfully loaded #{path}", :upgrade)
Einhorn::TransientState.preloaded = true
else
log_info("Proceeding with postload -- loaded #{path}, but no einhorn_main method was defined", :upgrade)
end
end
end
end
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.print_state ⇒ Object
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# File 'lib/einhorn.rb', line 143
def self.print_state
log_info(Einhorn::State.state.pretty_inspect)
end
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.renice_self ⇒ Object
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# File 'lib/einhorn.rb', line 286
def self.renice_self
whatami = Einhorn::TransientState.whatami
return unless nice = Einhorn::State.nice[whatami]
pid = $$
unless nice.kind_of?(Fixnum)
raise "Nice must be a fixnum: #{nice.inspect}"
end
cmd = "#{Einhorn::State.nice[:renice_cmd]} #{nice} -p #{pid}"
log_info("Running #{cmd.inspect} to renice self to level #{nice}")
`#{cmd}`
unless $?.exitstatus == 0
log_error("Renice command exited with status: #{$?.inspect}, but continuing on anyway.")
end
end
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.restore_state(state) ⇒ Object
.send_tagged_message(tag, message, last = false) ⇒ Object
.set_argv(cmd, set_ps_name) ⇒ Object
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# File 'lib/einhorn.rb', line 250
def self.set_argv(cmd, set_ps_name)
idx = 0
if cmd[0] =~ /(^|\/)ruby$/
idx = 1
elsif !is_script(cmd[0])
log_info("WARNING: Going to set $0 to #{cmd[idx]}, but it doesn't look like a script")
end
if set_ps_name
$0 = worker_ps_name
end
ARGV[0..-1] = cmd[idx+1..-1]
log_info("Set#{set_ps_name ? " $0 = #{$0.inspect}, " : nil} ARGV = #{ARGV.inspect}")
end
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.set_master_ps_name ⇒ Object
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# File 'lib/einhorn.rb', line 274
def self.set_master_ps_name
$0 = master_ps_name
end
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.socketify!(cmd) ⇒ Object
This duplicates some code from the environment path, but is deprecated so that’s ok.
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# File 'lib/einhorn.rb', line 314
def self.socketify!(cmd)
cmd.map! do |arg|
if arg =~ /^(.*=|)srv:([^:]+):(\d+)((?:,\w+)*)$/
log_error("Using deprecated command-line configuration for Einhorn; should upgrade to the environment variable interface.")
opt = $1
host = $2
port = $3
flags = $4.split(',').select {|flag| flag.length > 0}.map {|flag| flag.downcase}
fd = (Einhorn::State.sockets[[host, port]] ||= bind(host, port, flags))
"#{opt}#{fd}"
else
arg
end
end
end
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.socketify_env! ⇒ Object
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# File 'lib/einhorn.rb', line 305
def self.socketify_env!
Einhorn::State.bind.each do |host, port, flags|
fd = bind(host, port, flags)
Einhorn::State.bind_fds << fd
end
end
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.update_state(store, store_name, old_state) ⇒ Object
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# File 'lib/einhorn.rb', line 102
def self.update_state(store, store_name, old_state)
message = []
updated_state = old_state.dup
if store == Einhorn::State && updated_state[:children]
dead = []
updated_state[:children].each do |pid, v|
begin
pid = Process.wait(pid, Process::WNOHANG)
dead << pid if pid
rescue Errno::ECHILD
dead << pid
end
end
Einhorn::Event::Timer.open(0) do
dead.each {|pid| Einhorn::Command.mourn(pid)}
end
end
default = store.default_state
added_keys = default.keys - updated_state.keys
deleted_keys = updated_state.keys - default.keys
return [updated_state, message.first] if added_keys.length == 0 && deleted_keys.length == 0
added_keys.each {|key| updated_state[key] = default[key]}
deleted_keys.each {|key| updated_state.delete(key)}
message << "adding default values for #{added_keys.inspect}"
message << "deleting values for #{deleted_keys.inspect}"
message = "State format for #{store_name} has changed: #{message.join(', ')}"
[updated_state, message]
end
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.upgrade_commandline(einhorn_flags = []) ⇒ Object
Construct and a command and args that can be used to re-exec Einhorn for upgrades.
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# File 'lib/einhorn.rb', line 332
def self.upgrade_commandline(einhorn_flags=[])
cmdline = []
if Einhorn::State.reexec_commandline
cmdline += Einhorn::State.reexec_commandline
else
cmdline << Einhorn::TransientState.script_name
end
cmdline += einhorn_flags
cmdline << '--'
cmdline += Einhorn::State.cmd
[cmdline[0], cmdline[1..-1]]
end
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.which(cmd) ⇒ Object
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# File 'lib/einhorn.rb', line 203
def self.which(cmd)
if cmd.include?('/')
return cmd if File.exists?(cmd)
raise "Could not find #{cmd}"
else
ENV['PATH'].split(':').each do |f|
abs = File.join(f, cmd)
return abs if File.exists?(abs)
end
raise "Could not find #{cmd} in PATH"
end
end
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