Class: Lockfile
- Inherits:
-
Object
- Object
- Lockfile
- Defined in:
- lib/lockfile.rb
Defined Under Namespace
Classes: LockError, MaxTriesLockError, NFSLockError, SleepCycle, StackingLockError, StatLockError, StolenLockError, TimeoutLockError, UnLockError
Constant Summary collapse
- VERSION =
'2.0.1'
- HOSTNAME =
Socket.gethostname
- DEFAULT_RETRIES =
maximum number of attempts
nil
- DEFAULT_TIMEOUT =
the longest we will try
nil
- DEFAULT_MAX_AGE =
lockfiles older than this are stale
3600
- DEFAULT_SLEEP_INC =
sleep cycle is this much longer each time
2
- DEFAULT_MIN_SLEEP =
shortest sleep time
2
- DEFAULT_MAX_SLEEP =
longest sleep time
32
- DEFAULT_SUSPEND =
iff we steal a lock wait this long before we go on
1800
- DEFAULT_REFRESH =
how often we touch/validate the lock
8
- DEFAULT_DONT_CLEAN =
iff we leave lock files lying around
false
- DEFAULT_POLL_RETRIES =
this many polls makes one ‘try’
16
- DEFAULT_POLL_MAX_SLEEP =
the longest we’ll sleep between polls
0.08
- DEFAULT_DONT_SWEEP =
if we cleanup after other process on our host
false
- DEFAULT_DONT_USE_LOCK_ID =
if we dump lock info into lockfile
false
- DEFAULT_DEBUG =
ENV['LOCKFILE_DEBUG'] || false
Class Attribute Summary collapse
-
.debug ⇒ Object
Returns the value of attribute debug.
-
.dont_clean ⇒ Object
Returns the value of attribute dont_clean.
-
.dont_sweep ⇒ Object
Returns the value of attribute dont_sweep.
-
.dont_use_lock_id ⇒ Object
Returns the value of attribute dont_use_lock_id.
-
.max_age ⇒ Object
Returns the value of attribute max_age.
-
.max_sleep ⇒ Object
Returns the value of attribute max_sleep.
-
.min_sleep ⇒ Object
Returns the value of attribute min_sleep.
-
.poll_max_sleep ⇒ Object
Returns the value of attribute poll_max_sleep.
-
.poll_retries ⇒ Object
Returns the value of attribute poll_retries.
-
.refresh ⇒ Object
Returns the value of attribute refresh.
-
.retries ⇒ Object
Returns the value of attribute retries.
-
.sleep_inc ⇒ Object
Returns the value of attribute sleep_inc.
-
.suspend ⇒ Object
Returns the value of attribute suspend.
-
.timeout ⇒ Object
Returns the value of attribute timeout.
Instance Attribute Summary collapse
-
#basename ⇒ Object
readonly
Returns the value of attribute basename.
-
#clean ⇒ Object
readonly
Returns the value of attribute clean.
-
#debug ⇒ Object
(also: #debug?)
Returns the value of attribute debug.
-
#dirname ⇒ Object
readonly
Returns the value of attribute dirname.
-
#dont_clean ⇒ Object
readonly
Returns the value of attribute dont_clean.
-
#dont_sweep ⇒ Object
readonly
Returns the value of attribute dont_sweep.
-
#dont_use_lock_id ⇒ Object
readonly
Returns the value of attribute dont_use_lock_id.
-
#klass ⇒ Object
readonly
Returns the value of attribute klass.
-
#locked ⇒ Object
(also: #locked?)
readonly
Returns the value of attribute locked.
-
#max_age ⇒ Object
readonly
Returns the value of attribute max_age.
-
#max_sleep ⇒ Object
readonly
Returns the value of attribute max_sleep.
-
#min_sleep ⇒ Object
readonly
Returns the value of attribute min_sleep.
-
#opts ⇒ Object
readonly
Returns the value of attribute opts.
-
#path ⇒ Object
readonly
Returns the value of attribute path.
-
#poll_max_sleep ⇒ Object
readonly
Returns the value of attribute poll_max_sleep.
-
#poll_retries ⇒ Object
readonly
Returns the value of attribute poll_retries.
-
#refresh ⇒ Object
readonly
Returns the value of attribute refresh.
-
#refresher ⇒ Object
readonly
Returns the value of attribute refresher.
-
#retries ⇒ Object
readonly
Returns the value of attribute retries.
-
#sleep_inc ⇒ Object
readonly
Returns the value of attribute sleep_inc.
-
#suspend ⇒ Object
readonly
Returns the value of attribute suspend.
-
#thief ⇒ Object
(also: #thief?)
readonly
Returns the value of attribute thief.
-
#timeout ⇒ Object
readonly
Returns the value of attribute timeout.
Class Method Summary collapse
Instance Method Summary collapse
- #alive?(pid) ⇒ Boolean
- #attempt ⇒ Object
- #create(path) ⇒ Object
- #create_tmplock ⇒ Object
- #dump_lock_id(lock_id = @lock_id) ⇒ Object
- #errmsg(e) ⇒ Object
- #gen_lock_id ⇒ Object
- #getopt(key, default = nil) ⇒ Object
- #give_up! ⇒ Object
-
#initialize(path, opts = {}, &block) ⇒ Lockfile
constructor
A new instance of Lockfile.
- #load_lock_id(buf) ⇒ Object
- #lock ⇒ Object
- #new_refresher ⇒ Object
- #sweep ⇒ Object
- #timestamp ⇒ Object
- #tmpnam(dir, seed = File.basename($0)) ⇒ Object
- #to_str ⇒ Object (also: #to_s)
- #touch(path) ⇒ Object
- #trace(s = nil) ⇒ Object
- #try_again! ⇒ Object (also: #again!)
- #uncache(file) ⇒ Object
- #unlock ⇒ Object
- #validlock? ⇒ Boolean
- #version ⇒ Object
Constructor Details
#initialize(path, opts = {}, &block) ⇒ Lockfile
Returns a new instance of Lockfile.
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# File 'lib/lockfile.rb', line 166 def initialize(path, opts = {}, &block) @klass = self.class @path = path @opts = opts @retries = getopt 'retries' , @klass.retries @max_age = getopt 'max_age' , @klass.max_age @sleep_inc = getopt 'sleep_inc' , @klass.sleep_inc @min_sleep = getopt 'min_sleep' , @klass.min_sleep @max_sleep = getopt 'max_sleep' , @klass.max_sleep @suspend = getopt 'suspend' , @klass.suspend @timeout = getopt 'timeout' , @klass.timeout @refresh = getopt 'refresh' , @klass.refresh @dont_clean = getopt 'dont_clean' , @klass.dont_clean @poll_retries = getopt 'poll_retries' , @klass.poll_retries @poll_max_sleep = getopt 'poll_max_sleep' , @klass.poll_max_sleep @dont_sweep = getopt 'dont_sweep' , @klass.dont_sweep @dont_use_lock_id = getopt 'dont_use_lock_id' , @klass.dont_use_lock_id @debug = getopt 'debug' , @klass.debug @sleep_cycle = SleepCycle.new @min_sleep, @max_sleep, @sleep_inc @clean = @dont_clean ? nil : lambda{ File.unlink @path rescue nil } @dirname = File.dirname @path @basename = File.basename @path @thief = false @locked = false @refrsher = nil lock(&block) if block end |
Class Attribute Details
.debug ⇒ Object
Returns the value of attribute debug.
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# File 'lib/lockfile.rb', line 83 def debug @debug end |
.dont_clean ⇒ Object
Returns the value of attribute dont_clean.
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# File 'lib/lockfile.rb', line 84 def dont_clean @dont_clean end |
.dont_sweep ⇒ Object
Returns the value of attribute dont_sweep.
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# File 'lib/lockfile.rb', line 87 def dont_sweep @dont_sweep end |
.dont_use_lock_id ⇒ Object
Returns the value of attribute dont_use_lock_id.
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# File 'lib/lockfile.rb', line 88 def dont_use_lock_id @dont_use_lock_id end |
.max_age ⇒ Object
Returns the value of attribute max_age.
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# File 'lib/lockfile.rb', line 76 def max_age @max_age end |
.max_sleep ⇒ Object
Returns the value of attribute max_sleep.
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# File 'lib/lockfile.rb', line 79 def max_sleep @max_sleep end |
.min_sleep ⇒ Object
Returns the value of attribute min_sleep.
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# File 'lib/lockfile.rb', line 78 def min_sleep @min_sleep end |
.poll_max_sleep ⇒ Object
Returns the value of attribute poll_max_sleep.
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# File 'lib/lockfile.rb', line 86 def poll_max_sleep @poll_max_sleep end |
.poll_retries ⇒ Object
Returns the value of attribute poll_retries.
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# File 'lib/lockfile.rb', line 85 def poll_retries @poll_retries end |
.refresh ⇒ Object
Returns the value of attribute refresh.
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# File 'lib/lockfile.rb', line 82 def refresh @refresh end |
.retries ⇒ Object
Returns the value of attribute retries.
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# File 'lib/lockfile.rb', line 75 def retries @retries end |
.sleep_inc ⇒ Object
Returns the value of attribute sleep_inc.
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# File 'lib/lockfile.rb', line 77 def sleep_inc @sleep_inc end |
.suspend ⇒ Object
Returns the value of attribute suspend.
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# File 'lib/lockfile.rb', line 80 def suspend @suspend end |
.timeout ⇒ Object
Returns the value of attribute timeout.
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# File 'lib/lockfile.rb', line 81 def timeout @timeout end |
Instance Attribute Details
#basename ⇒ Object (readonly)
Returns the value of attribute basename.
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# File 'lib/lockfile.rb', line 121 def basename @basename end |
#clean ⇒ Object (readonly)
Returns the value of attribute clean.
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# File 'lib/lockfile.rb', line 122 def clean @clean end |
#debug ⇒ Object Also known as: debug?
Returns the value of attribute debug.
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# File 'lib/lockfile.rb', line 137 def debug @debug end |
#dirname ⇒ Object (readonly)
Returns the value of attribute dirname.
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# File 'lib/lockfile.rb', line 120 def dirname @dirname end |
#dont_clean ⇒ Object (readonly)
Returns the value of attribute dont_clean.
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# File 'lib/lockfile.rb', line 131 def dont_clean @dont_clean end |
#dont_sweep ⇒ Object (readonly)
Returns the value of attribute dont_sweep.
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# File 'lib/lockfile.rb', line 134 def dont_sweep @dont_sweep end |
#dont_use_lock_id ⇒ Object (readonly)
Returns the value of attribute dont_use_lock_id.
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# File 'lib/lockfile.rb', line 135 def dont_use_lock_id @dont_use_lock_id end |
#klass ⇒ Object (readonly)
Returns the value of attribute klass.
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# File 'lib/lockfile.rb', line 114 def klass @klass end |
#locked ⇒ Object (readonly) Also known as: locked?
Returns the value of attribute locked.
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# File 'lib/lockfile.rb', line 117 def locked @locked end |
#max_age ⇒ Object (readonly)
Returns the value of attribute max_age.
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# File 'lib/lockfile.rb', line 124 def max_age @max_age end |
#max_sleep ⇒ Object (readonly)
Returns the value of attribute max_sleep.
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# File 'lib/lockfile.rb', line 127 def max_sleep @max_sleep end |
#min_sleep ⇒ Object (readonly)
Returns the value of attribute min_sleep.
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# File 'lib/lockfile.rb', line 126 def min_sleep @min_sleep end |
#opts ⇒ Object (readonly)
Returns the value of attribute opts.
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# File 'lib/lockfile.rb', line 116 def opts @opts end |
#path ⇒ Object (readonly)
Returns the value of attribute path.
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# File 'lib/lockfile.rb', line 115 def path @path end |
#poll_max_sleep ⇒ Object (readonly)
Returns the value of attribute poll_max_sleep.
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# File 'lib/lockfile.rb', line 133 def poll_max_sleep @poll_max_sleep end |
#poll_retries ⇒ Object (readonly)
Returns the value of attribute poll_retries.
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# File 'lib/lockfile.rb', line 132 def poll_retries @poll_retries end |
#refresh ⇒ Object (readonly)
Returns the value of attribute refresh.
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# File 'lib/lockfile.rb', line 129 def refresh @refresh end |
#refresher ⇒ Object (readonly)
Returns the value of attribute refresher.
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# File 'lib/lockfile.rb', line 119 def refresher @refresher end |
#retries ⇒ Object (readonly)
Returns the value of attribute retries.
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# File 'lib/lockfile.rb', line 123 def retries @retries end |
#sleep_inc ⇒ Object (readonly)
Returns the value of attribute sleep_inc.
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# File 'lib/lockfile.rb', line 125 def sleep_inc @sleep_inc end |
#suspend ⇒ Object (readonly)
Returns the value of attribute suspend.
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# File 'lib/lockfile.rb', line 128 def suspend @suspend end |
#thief ⇒ Object (readonly) Also known as: thief?
Returns the value of attribute thief.
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# File 'lib/lockfile.rb', line 118 def thief @thief end |
#timeout ⇒ Object (readonly)
Returns the value of attribute timeout.
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# File 'lib/lockfile.rb', line 130 def timeout @timeout end |
Class Method Details
.create(path, *a, &b) ⇒ Object
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# File 'lib/lockfile.rb', line 143 def Lockfile.create(path, *a, &b) opts = { 'retries' => 0, 'min_sleep' => 0, 'max_sleep' => 1, 'sleep_inc' => 1, 'max_age' => nil, 'suspend' => 0, 'refresh' => nil, 'timeout' => nil, 'poll_retries' => 0, 'dont_clean' => true, 'dont_sweep' => false, 'dont_use_lock_id' => true, } begin new(path, opts).lock rescue LockError raise Errno::EEXIST, path end open(path, *a, &b) end |
.description ⇒ Object
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# File 'lib/lockfile.rb', line 13 def Lockfile.description 'a ruby library for creating perfect and NFS safe lockfiles' end |
.init ⇒ Object
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# File 'lib/lockfile.rb', line 90 def init @retries = DEFAULT_RETRIES @max_age = DEFAULT_MAX_AGE @sleep_inc = DEFAULT_SLEEP_INC @min_sleep = DEFAULT_MIN_SLEEP @max_sleep = DEFAULT_MAX_SLEEP @suspend = DEFAULT_SUSPEND @timeout = DEFAULT_TIMEOUT @refresh = DEFAULT_REFRESH @dont_clean = DEFAULT_DONT_CLEAN @poll_retries = DEFAULT_POLL_RETRIES @poll_max_sleep = DEFAULT_POLL_MAX_SLEEP @dont_sweep = DEFAULT_DONT_SWEEP @dont_use_lock_id = DEFAULT_DONT_USE_LOCK_ID @debug = DEFAULT_DEBUG STDOUT.sync = true if @debug STDERR.sync = true if @debug end |
Instance Method Details
#alive?(pid) ⇒ Boolean
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# File 'lib/lockfile.rb', line 343 def alive? pid pid = Integer("#{ pid }") begin Process.kill 0, pid true rescue Errno::ESRCH false end end |
#attempt ⇒ Object
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# File 'lib/lockfile.rb', line 519 def attempt ret = nil loop{ break unless catch('attempt'){ ret = yield } == 'try_again' } ret end |
#create(path) ⇒ Object
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# File 'lib/lockfile.rb', line 483 def create(path) umask = nil f = nil begin umask = File.umask 022 f = open path, File::WRONLY|File::CREAT|File::EXCL, 0644 ensure File.umask umask if umask end return(block_given? ? begin; yield f; ensure; f.close; end : f) end |
#create_tmplock ⇒ Object
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# File 'lib/lockfile.rb', line 423 def create_tmplock tmplock = tmpnam @dirname begin create(tmplock) do |f| unless dont_use_lock_id @lock_id = gen_lock_id dumped = dump_lock_id trace{"lock_id <\n#{ @lock_id.inspect }\n>"} f.write dumped f.flush end yield f end ensure begin; File.unlink tmplock; rescue Errno::ENOENT; end if tmplock end end |
#dump_lock_id(lock_id = @lock_id) ⇒ Object
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# File 'lib/lockfile.rb', line 457 def dump_lock_id(lock_id = @lock_id) "host: %s\npid: %s\nppid: %s\ntime: %s\n" % lock_id.values_at('host','pid','ppid','time') end |
#errmsg(e) ⇒ Object
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# File 'lib/lockfile.rb', line 515 def errmsg(e) "%s (%s)\n%s\n" % [e.class, e., e.backtrace.join("\n")] end |
#gen_lock_id ⇒ Object
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# File 'lib/lockfile.rb', line 441 def gen_lock_id Hash[ 'host' => "#{ HOSTNAME }", 'pid' => "#{ Process.pid }", 'ppid' => "#{ Process.ppid }", 'time' => , ] end |
#getopt(key, default = nil) ⇒ Object
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# File 'lib/lockfile.rb', line 499 def getopt(key, default = nil) [ key, key.to_s, key.to_s.intern ].each do |k| return @opts[k] if @opts.has_key?(k) end return default end |
#give_up! ⇒ Object
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# File 'lib/lockfile.rb', line 530 def give_up! throw 'attempt', 'give_up' end |
#load_lock_id(buf) ⇒ Object
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# File 'lib/lockfile.rb', line 462 def load_lock_id(buf) lock_id = {} kv = %r/([^:]+):(.*)/o buf.each_line do |line| m = kv.match line k, v = m[1], m[2] next unless m and k and v lock_id[k.strip] = v.strip end lock_id end |
#lock ⇒ Object
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# File 'lib/lockfile.rb', line 198 def lock raise StackingLockError, "<#{ @path }> is locked!" if @locked sweep unless @dont_sweep ret = nil attempt do begin @sleep_cycle.reset create_tmplock do |f| begin Timeout.timeout(@timeout) do tmp_path = f.path tmp_stat = f.lstat n_retries = 0 trace{ "attempting to lock <#{ @path }>..." } begin i = 0 begin trace{ "polling attempt <#{ i }>..." } begin File.link tmp_path, @path rescue Errno::ENOENT try_again! end lock_stat = File.lstat @path raise StatLockError, "stat's do not agree" unless tmp_stat.rdev == lock_stat.rdev and tmp_stat.ino == lock_stat.ino trace{ "aquired lock <#{ @path }>" } @locked = true rescue => e i += 1 unless i >= @poll_retries t = [rand(@poll_max_sleep), @poll_max_sleep].min trace{ "poll sleep <#{ t }>..." } sleep t retry end raise end rescue => e n_retries += 1 trace{ "n_retries <#{ n_retries }>" } case validlock? when true raise MaxTriesLockError, "surpased retries <#{ @retries }>" if @retries and n_retries >= @retries trace{ "found valid lock" } sleeptime = @sleep_cycle.next trace{ "sleep <#{ sleeptime }>..." } sleep sleeptime when false trace{ "found invalid lock and removing" } begin File.unlink @path @thief = true warn "<#{ @path }> stolen by <#{ Process.pid }> at <#{ }>" trace{ "i am a thief!" } rescue Errno::ENOENT end trace{ "suspending <#{ @suspend }>" } sleep @suspend when nil raise MaxTriesLockError, "surpased retries <#{ @retries }>" if @retries and n_retries >= @retries end retry end # begin end # timeout rescue Timeout::Error raise TimeoutLockError, "surpassed timeout <#{ @timeout }>" end # begin end # create_tmplock if block_given? stolen = false @refresher = (@refresh ? new_refresher : nil) begin begin ret = yield @path rescue StolenLockError stolen = true raise end ensure begin @refresher.kill if @refresher and @refresher.status @refresher = nil ensure unlock unless stolen end end else @refresher = (@refresh ? new_refresher : nil) ObjectSpace.define_finalizer self, @clean if @clean ret = self end rescue Errno::ESTALE, Errno::EIO => e raise(NFSLockError, errmsg(e)) end end return ret end |
#new_refresher ⇒ Object
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# File 'lib/lockfile.rb', line 370 def new_refresher Thread.new(Thread.current, @path, @refresh, @dont_use_lock_id) do |thread, path, refresh, dont_use_lock_id| loop do begin touch path trace{"touched <#{ path }> @ <#{ Time.now.to_f }>"} unless dont_use_lock_id loaded = load_lock_id(IO.read(path)) trace{"loaded <\n#{ loaded.inspect }\n>"} raise unless loaded == @lock_id end sleep refresh rescue Exception => e trace{errmsg e} thread.raise StolenLockError Thread.exit end end end end |
#sweep ⇒ Object
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# File 'lib/lockfile.rb', line 305 def sweep begin glob = File.join(@dirname, ".*lck") paths = Dir[glob] paths.each do |path| begin basename = File.basename path pat = %r/^\s*\.([^_]+)_([^_]+)/o if pat.match(basename) host, pid = $1, $2 else next end host.gsub!(%r/^\.+|\.+$/,'') quad = host.split %r/\./ host = quad.first pat = %r/^\s*#{ host }/i if pat.match(HOSTNAME) and %r/^\s*\d+\s*$/.match(pid) unless alive?(pid) trace{ "process <#{ pid }> on <#{ host }> is no longer alive" } trace{ "sweeping <#{ path }>" } FileUtils.rm_f path else trace{ "process <#{ pid }> on <#{ host }> is still alive" } trace{ "ignoring <#{ path }>" } end else trace{ "ignoring <#{ path }> generated by <#{ host }>" } end rescue next end end rescue => e warn(errmsg(e)) end end |
#timestamp ⇒ Object
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# File 'lib/lockfile.rb', line 450 def time = Time.now usec = time.usec.to_s usec << '0' while usec.size < 6 "#{ time.strftime('%Y-%m-%d %H:%M:%S') }.#{ usec }" end |
#tmpnam(dir, seed = File.basename($0)) ⇒ Object
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# File 'lib/lockfile.rb', line 474 def tmpnam(dir, seed = File.basename($0)) pid = Process.pid time = Time.now sec = time.to_i usec = time.usec "%s%s.%s_%d_%s_%d_%d_%d.lck" % [dir, File::SEPARATOR, HOSTNAME, pid, seed, sec, usec, rand(sec)] end |
#to_str ⇒ Object Also known as: to_s
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# File 'lib/lockfile.rb', line 506 def to_str @path end |
#touch(path) ⇒ Object
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# File 'lib/lockfile.rb', line 495 def touch(path) FileUtils.touch path end |
#trace(s = nil) ⇒ Object
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# File 'lib/lockfile.rb', line 511 def trace(s = nil) STDERR.puts((s ? s : yield)) if @debug end |
#try_again! ⇒ Object Also known as: again!
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# File 'lib/lockfile.rb', line 525 def try_again! throw 'attempt', 'try_again' end |
#uncache(file) ⇒ Object
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# File 'lib/lockfile.rb', line 405 def uncache file refresh = nil begin is_a_file = File === file path = (is_a_file ? file.path : file.to_s) stat = (is_a_file ? file.stat : File.stat(file.to_s)) refresh = tmpnam(File.dirname(path)) File.link path, refresh File.chmod stat.mode, path File.utime stat.atime, stat.mtime, path ensure begin File.unlink refresh if refresh rescue Errno::ENOENT end end end |
#unlock ⇒ Object
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# File 'lib/lockfile.rb', line 353 def unlock raise UnLockError, "<#{ @path }> is not locked!" unless @locked @refresher.kill if @refresher and @refresher.status @refresher = nil begin File.unlink @path rescue Errno::ENOENT raise StolenLockError, @path ensure @thief = false @locked = false ObjectSpace.undefine_finalizer self if @clean end end |
#validlock? ⇒ Boolean
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# File 'lib/lockfile.rb', line 391 def validlock? if @max_age uncache @path rescue nil begin return((Time.now - File.stat(@path).mtime) < @max_age) rescue Errno::ENOENT return nil end else exist = File.exist?(@path) return(exist ? true : nil) end end |