Class: RQ::QDB

Inherits:
Object
  • Object
show all
Includes:
Logging, Util
Defined in:
lib/rq-3.0.0/qdb.rb

Defined Under Namespace

Classes: AbortedTransactionError, RollbackTransactionError

Constant Summary collapse

FIELDS =
%w(
  jid priority state 
  submitted started finished elapsed
  submitter runner
  stdin stdout stderr
  pid exit_status
  tag restartable command
)
PRAGMAS =
<<-sql
  PRAGMA default_synchronous = FULL;
sql
SCHEMA =
<<-sql
  create table jobs
  (
    jid integer primary key,
    #{ FIELDS[1..-1].join ",\n          " }
  );
  create table attributes
  (
    key,
    value,
    primary key (key)
  );
sql
DEFAULT_LOGGER =
Logger::new(STDERR)
DEFAULT_SQL_DEBUG =
false
DEFAULT_TRANSACTION_RETRIES =
4
DEFAULT_AQUIRE_LOCK_SC =
SleepCycle::new(2, 16, 2)
DEFAULT_TRANSACTION_RETRIES_SC =
SleepCycle::new(8, 24, 8)
DEFAULT_ATTEMPT_LOCKD_RECOVERY =
true
DEFAULT_LOCKD_RECOVER_WAIT =
3600
DEFAULT_AQUIRE_LOCK_LOCKFILE_STALE_AGE =
21600
DEFAULT_AQUIRE_LOCK_REFRESH_RATE =
30

Constants included from Logging

Logging::DIV0, Logging::DIV1, Logging::DIV2, Logging::DIV3, Logging::EOL, Logging::SEC0, Logging::SEC1, Logging::SEC2, Logging::SEC3

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logging

append_features

Methods included from Logging::LogMethods

#debug, #error, #fatal, #info, #logerr, #logger, #logger=, #warn

Methods included from Util

#alive?, append_features, #btrace, #columnize, #defval, #emsg, #erreq, #errmsg, #escape, #escape!, #exec, export, #fork, #getopt, #hashify, #hms, #host, #hostname, #klass, #maim, #mcp, #realpath, #stamptime, #system, #timestamp, #tmpnam, #uncache, #which_ruby

Constructor Details

#initialize(path, opts = {}) ⇒ QDB

Returns a new instance of QDB.


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# File 'lib/rq-3.0.0/qdb.rb', line 185

def initialize path, opts = {}
#--{{{
  @path = path
  @opts = opts

  @logger = 
    Util::getopt('logger', @opts) || 
    klass.logger || 
    DEFAULT_LOGGER

  @sql_debug = 
    Util::getopt('sql_debug', @opts) || 
    klass.sql_debug || 
    ENV['RQ_SQL_DEBUG'] || 
    DEFAULT_SQL_DEBUG

  @transaction_retries = 
    Util::getopt('transaction_retries', @opts) || 
    klass.transaction_retries ||
    DEFAULT_TRANSACTION_RETRIES

  @aquire_lock_sc =
    Util::getopt('aquire_lock_sc', @opts) ||
    klass.aquire_lock_sc ||
    DEFAULT_AQUIRE_LOCK_SC

  @transaction_retries_sc = 
    Util::getopt('transaction_retries_sc', @opts) ||
    klass.transaction_retries_sc ||
    DEFAULT_TRANSACTION_RETRIES_SC

  @attempt_lockd_recovery = 
    Util::getopt('attempt_lockd_recovery', @opts) ||
    klass.attempt_lockd_recovery ||
    DEFAULT_ATTEMPT_LOCKD_RECOVERY

  @lockd_recover_wait = 
    Util::getopt('lockd_recover_wait', @opts) ||
    klass.lockd_recover_wait ||
    DEFAULT_LOCKD_RECOVER_WAIT

  @aquire_lock_lockfile_stale_age = 
    Util::getopt('aquire_lock_lockfile_stale_age', @opts) ||
    klass.aquire_lock_lockfile_stale_age ||
    DEFAULT_AQUIRE_LOCK_LOCKFILE_STALE_AGE

  @aquire_lock_refresh_rate = 
    Util::getopt('aquire_lock_refresh_rate', @opts) ||
    klass.aquire_lock_refresh_rate ||
    DEFAULT_AQUIRE_LOCK_REFRESH_RATE


  @schema = "#{ @path }.schema"
  @dirname = File::dirname(path).gsub(%r|/+\s*$|,'')
  @basename = File::basename(path)
  @waiting_w = File::join(@dirname, "#{ Util::hostname }.#{ $$ }.waiting.w") 
  @waiting_r = File::join(@dirname, "#{ Util::hostname }.#{ $$ }.waiting.r") 
  @lock_w = File::join(@dirname, "#{ Util::hostname }.#{ $$ }.lock.w") 
  @lock_r = File::join(@dirname, "#{ Util::hostname }.#{ $$ }.lock.r") 
  @lockfile = File::join(@dirname, 'lock') 
  @lockf = Lockfile::new("#{ @path }.lock") 
  @fields = FIELDS
  @in_transaction = false
  @in_ro_transaction = false
  @db = nil

  @lockd_recover = "#{ @dirname }.lockd_recover"
  @lockd_recover_lockf = Lockfile::new "#{ @lockd_recover }.lock"
  @lockd_recovered = false
#--}}}
end

Class Attribute Details

.aquire_lock_lockfile_stale_ageObject

Returns the value of attribute aquire_lock_lockfile_stale_age


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# File 'lib/rq-3.0.0/qdb.rb', line 81

def aquire_lock_lockfile_stale_age
  @aquire_lock_lockfile_stale_age
end

.aquire_lock_refresh_rateObject

Returns the value of attribute aquire_lock_refresh_rate


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# File 'lib/rq-3.0.0/qdb.rb', line 82

def aquire_lock_refresh_rate
  @aquire_lock_refresh_rate
end

.aquire_lock_scObject

Returns the value of attribute aquire_lock_sc


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# File 'lib/rq-3.0.0/qdb.rb', line 77

def aquire_lock_sc
  @aquire_lock_sc
end

.attempt_lockd_recoveryObject

Returns the value of attribute attempt_lockd_recovery


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# File 'lib/rq-3.0.0/qdb.rb', line 79

def attempt_lockd_recovery
  @attempt_lockd_recovery
end

.lockd_recover_waitObject

Returns the value of attribute lockd_recover_wait


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# File 'lib/rq-3.0.0/qdb.rb', line 80

def lockd_recover_wait
  @lockd_recover_wait
end

.sql_debugObject

Returns the value of attribute sql_debug


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# File 'lib/rq-3.0.0/qdb.rb', line 75

def sql_debug
  @sql_debug
end

.transaction_retriesObject

Returns the value of attribute transaction_retries


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# File 'lib/rq-3.0.0/qdb.rb', line 76

def transaction_retries
  @transaction_retries
end

.transaction_retries_scObject

Returns the value of attribute transaction_retries_sc


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# File 'lib/rq-3.0.0/qdb.rb', line 78

def transaction_retries_sc
  @transaction_retries_sc
end

Instance Attribute Details

#aquire_lock_lockfile_stale_ageObject

Returns the value of attribute aquire_lock_lockfile_stale_age


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# File 'lib/rq-3.0.0/qdb.rb', line 181

def aquire_lock_lockfile_stale_age
  @aquire_lock_lockfile_stale_age
end

#aquire_lock_refresh_rateObject

Returns the value of attribute aquire_lock_refresh_rate


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# File 'lib/rq-3.0.0/qdb.rb', line 182

def aquire_lock_refresh_rate
  @aquire_lock_refresh_rate
end

#aquire_lock_scObject

Returns the value of attribute aquire_lock_sc


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# File 'lib/rq-3.0.0/qdb.rb', line 177

def aquire_lock_sc
  @aquire_lock_sc
end

#attempt_lockd_recoveryObject

Returns the value of attribute attempt_lockd_recovery


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# File 'lib/rq-3.0.0/qdb.rb', line 179

def attempt_lockd_recovery
  @attempt_lockd_recovery
end

#dirnameObject (readonly)

Returns the value of attribute dirname


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# File 'lib/rq-3.0.0/qdb.rb', line 170

def dirname
  @dirname
end

#fieldsObject (readonly)

Returns the value of attribute fields


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# File 'lib/rq-3.0.0/qdb.rb', line 172

def fields
  @fields
end

#lockd_recover_waitObject

Returns the value of attribute lockd_recover_wait


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# File 'lib/rq-3.0.0/qdb.rb', line 180

def lockd_recover_wait
  @lockd_recover_wait
end

#lockfileObject (readonly)

Returns the value of attribute lockfile


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# File 'lib/rq-3.0.0/qdb.rb', line 174

def lockfile
  @lockfile
end

#mutexObject (readonly)

Returns the value of attribute mutex


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# File 'lib/rq-3.0.0/qdb.rb', line 173

def mutex
  @mutex
end

#optsObject (readonly)

Returns the value of attribute opts


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# File 'lib/rq-3.0.0/qdb.rb', line 169

def opts
  @opts
end

#pathObject (readonly)

Returns the value of attribute path


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# File 'lib/rq-3.0.0/qdb.rb', line 168

def path
  @path
end

#schemaObject (readonly)

Returns the value of attribute schema


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# File 'lib/rq-3.0.0/qdb.rb', line 171

def schema
  @schema
end

#sql_debugObject

Returns the value of attribute sql_debug


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# File 'lib/rq-3.0.0/qdb.rb', line 175

def sql_debug
  @sql_debug
end

#transaction_retriesObject

Returns the value of attribute transaction_retries


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# File 'lib/rq-3.0.0/qdb.rb', line 176

def transaction_retries
  @transaction_retries
end

#transaction_retries_scObject

Returns the value of attribute transaction_retries_sc


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# File 'lib/rq-3.0.0/qdb.rb', line 178

def transaction_retries_sc
  @transaction_retries_sc
end

Class Method Details

.create(path, opts = {}) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 143

def create path, opts = {}
#--{{{
  qdb = new path, opts
  FileUtils::touch qdb.lockfile
  create_schema qdb.schema
  qdb.transaction do 
    qdb.execute PRAGMAS
    qdb.execute SCHEMA
  end
  qdb
#--}}}
end

.create_schema(path) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 155

def create_schema path
#--{{{
  tmp = "#{ path }.tmp"
  open(tmp,'w') do |f| 
    f.puts PRAGMAS 
    f.puts SCHEMA
  end
  FileUtils::mv tmp, path
#--}}}
end

.fieldsObject


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# File 'lib/rq-3.0.0/qdb.rb', line 84

def fields
#--{{{
  FIELDS
#--}}}
end

.h2t(h) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 118

def h2t h
#--{{{
  t = tuple
  FIELDS.each{|f| t[f] = h[f]}
  t
#--}}}
end

.integrity_check(dbpath) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 89

def integrity_check dbpath
#--{{{
  ret = false 
  tuple = nil
  begin
    db = 
      begin
        SQLite::Database::new dbpath, 0
      rescue
        SQLite::Database::new dbpath
      end
    opened = true
    db.use_array = true rescue nil
    tuple = db.execute 'PRAGMA integrity_check;'
    ret = (tuple and tuple.first and (tuple.first["integrity_check"] =~ /^\s*ok\s*$/io))
  ensure
    db.close if opened
    db = nil
  end
  ret
#--}}}
end

.q(tuple) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 132

def q tuple
#--{{{
  [ tuple ].flatten.map do |f| 
    if f and not f.to_s.empty?
      "'" << Util.escape(f,"'","'") << "'"
    else
      'NULL'
    end
  end
#--}}}
end

.t2h(tuple) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 111

def t2h tuple
#--{{{
  h = {}
  FIELDS.each_with_index{|f,i| h[f] = tuple[i]}
  h
#--}}}
end

.tupleObject


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# File 'lib/rq-3.0.0/qdb.rb', line 125

def tuple
#--{{{
  t = Array::new FIELDS.size
  t.fields = FIELDS
  t
#--}}}
end

Instance Method Details

#abort_transaction(*a) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 410

def abort_transaction(*a)
#--{{{
  raise AbortedTransactionError, *a
#--}}}
end

#aquire_lock(opts = {}) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 437

def aquire_lock opts = {} 
#--{{{
  ro = Util::getopt 'read_only', opts
  ret = nil

  @aquire_lock_sc.reset
    
  waiting, ltype, lfile =
    if ro
      [@waiting_r, File::LOCK_SH | File::LOCK_NB, @lock_r]
    else
      [@waiting_w, File::LOCK_EX | File::LOCK_NB, @lock_w]
    end
    
  ltype_s = (ltype == File::LOCK_EX ? 'write' : 'read')
  ltype ||= File::LOCK_NB

  aquired = false

  until aquired
    begin
      debug{ "aquiring lock" }
      #@lockf.lock unless ro

      open(@lockfile, 'a+') do |lf|

        locked = false
        refresher = nil
        sc = nil

        begin
          FileUtils::touch waiting
          # poll
          42.times do
            locked = lf.posixlock(ltype | File::LOCK_NB)
            break if locked
            sleep rand
          end

          if locked
            aquired = true
            refresher = Refresher::new @lockfile, @aquire_lock_refresh_rate
            debug{ "refresher pid <#{ refresher.pid }> refresh_rate <#{ @aquire_lock_refresh_rate }>" }
            FileUtils::rm_f waiting rescue nil
            FileUtils::touch lfile rescue nil
            debug{ "aquired lock" }
            ret = yield
            debug{ "released lock" }
          else
            aquired = false 
            stat = File::stat @lockfile
            mtime = stat.mtime
            stale = mtime < (Time::now - @aquire_lock_lockfile_stale_age)
            if stale
              Util::uncache @lockfile rescue nil
              stat = File::stat @lockfile
              mtime = stat.mtime
              stale = mtime < (Time::now - @aquire_lock_lockfile_stale_age)
              if stale
                warn{ "detected stale lockfile of mtime <#{ mtime }>" }
                lockd_recover if @attempt_lockd_recovery
              end
            end
            sc = @aquire_lock_sc.next
            debug{ "failed to aquire lock - sleep(#{ sc })" }
            sleep sc 
          end

        ensure
          if locked
            unlocked = false
            begin
              42.times do
                unlocked = lf.posixlock(File::LOCK_UN | File::LOCK_NB)
                break if unlocked
                sleep rand
              end
            ensure
              lf.posixlock File::LOCK_UN unless unlocked
            end
          end
          refresher.kill if refresher
          FileUtils::rm_f waiting rescue nil
          FileUtils::rm_f lfile rescue nil 
        end
      end
    ensure
      #@lockf.unlock rescue nil unless read_only
    end
  end
  ret
#--}}}
end

#connectObject


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# File 'lib/rq-3.0.0/qdb.rb', line 530

def connect
#--{{{
  ret = nil
  opened = nil
  begin
    raise 'db has no schema' unless test ?e, @schema
    debug{"connecting to db <#{ @path }>..."}
    $db = @db = 
      begin
        SQLite::Database::new(@path, 0)
      rescue
        SQLite::Database::new(@path)
      end
    debug{"connected."}
    opened = true
    @db.use_array = true rescue nil
    ret = yield @db
  ensure
    @db.close if opened
    $db = @db = nil
    debug{"disconnected from db <#{ @path }>"}
  end
  ret
#--}}}
end

#execute(sql, &block) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 555

def execute sql, &block
#--{{{
  raise 'not in transaction' unless @in_transaction
  if @sql_debug
    logger << "SQL:\n#{ sql }\n"
  end
  #ret = retry_if_locked{ @db.execute sql, &block }
  ret = @db.execute sql, &block
  if @sql_debug and ret and Array === ret and ret.first
    logger << "RESULT:\n#{ ret.first.inspect }\n...\n"
  end
  ret
#--}}}
end

#integrity_check(path = @path) ⇒ Object

–}}}


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# File 'lib/rq-3.0.0/qdb.rb', line 702

def integrity_check path = @path
#--{{{
  debug{ "running integrity_check on <#{ path }>" }
  klass.integrity_check(path)  
#--}}}
end

#lock(opts = {}) ⇒ Object Also known as: write_lock

–}}}


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# File 'lib/rq-3.0.0/qdb.rb', line 708

def lock opts = {} 
#--{{{
  ret = nil
  lockd_recover_wrap do
    aquire_lock(opts) do
      ret = yield 
    end
  end
  ret
#--}}}
end

#lockd_recoverObject


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# File 'lib/rq-3.0.0/qdb.rb', line 611

def lockd_recover
#--{{{
  return nil unless @attempt_lockd_recovery
  warn{ "attempting lockd recovery" }
  time = Time::now
  ret = nil

  @lockd_recover_lockf.lock do
    Util::uncache @dirname rescue nil
    Util::uncache @path rescue nil
    Util::uncache @lockfile rescue nil
    Util::uncache @lockd_recover rescue nil
    mtime = File::stat(@lockd_recover).mtime rescue time

    if mtime > time 
      warn{ "skipping lockd recovery (another node has already recovered)" }
      ret = true
    else
      moved = false
      begin
        FileUtils::touch @lockd_recover 
        @lockd_recovered = false 

        begin
          report = <<-msg
            hostname : #{ Util::hostname }
            pid      : #{ Process.pid }
            time     : #{ Time::now }
            q        : 
              path : #{ @dirname }
              stat : #{ File::stat(@dirname).inspect }
            db       : 
              path : #{ @path }
              stat : #{ File::stat(@path).inspect }
            lockfile : 
              path : #{ @lockfile }
              stat : #{ File::stat(@lockfile).inspect }
          msg
          info{ "LOCKD RECOVERY REPORT" }
          logger << report
          cmd = "mail -s LOCKD_RECOVERY [email protected] <<eof\n#{ report }\neof"
          Util::system cmd
        rescue
          nil
        end

        warn{ "sleeping #{ @lockd_recover_wait }s before continuing..." }
        sleep @lockd_recover_wait 

        tmp = "#{ @dirname }.tmp"
        FileUtils::rm_rf tmp
        FileUtils::mv @dirname, tmp
        moved = true

        rfiles = [@path, @lockfile].map{|f| File::join(tmp,File::basename(f))}
        rfiles.each do |f|
          ftmp = "#{ f }.tmp"
          FileUtils::rm_rf ftmp
          FileUtils::cp f, ftmp 
          FileUtils::rm f 
          FileUtils::mv ftmp, f 
        end

        dbtmp = File::join(tmp,File::basename(@path))

        if integrity_check(dbtmp)
          FileUtils::mv tmp, @dirname
          FileUtils::cp @lockd_recover_lockf.path, @lockd_recover 
          @lockd_recovered = true 
          Util::uncache @dirname rescue nil
          Util::uncache @path rescue nil
          Util::uncache @lockfile rescue nil
          Util::uncache @lockd_recover rescue nil
          warn{ "lockd recovery complete" }
        else
          FileUtils::mv tmp, @dirname
          @lockd_recovered = false 
          error{ "lockd recovery failed" }
        end

        ret = @lockd_recovered 
      ensure
        if moved and not @lockd_recovered and tmp and test(?d, tmp)
          FileUtils::mv tmp, @dirname
        end
      end
    end
  end
  ret
#--}}}
end

#lockd_recover_wrap(opts = {}) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 327

def lockd_recover_wrap opts = {}
#--{{{
  ret = nil
  try_again = false
  begin
    begin
      @lockd_recovered = false
      old_mtime = 
        begin
          Util::uncache @lockd_recover rescue nil
          File::stat(@lockd_recover).mtime
        rescue
          Time::now 
        end
      ret = yield
    ensure
      new_mtime =
        begin
          Util::uncache @lockd_recover rescue nil
          File::stat(@lockd_recover).mtime
        rescue
          old_mtime
        end

      if new_mtime and old_mtime and new_mtime > old_mtime and not @lockd_recovered
        try_again = true
      end
    end
  rescue
    if try_again
      warn{ "a remote lockd recovery has invalidated this transaction!" }
      warn{ "retrying..."}
      sleep 120
      retry
    else
      raise
    end
  end
  ret
#--}}}
end

#read_lock(opts = {}, &block) ⇒ Object Also known as: rlock


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# File 'lib/rq-3.0.0/qdb.rb', line 721

def read_lock(opts = {}, &block)
#--{{{
  opts['read_only'] = true
  lock opts, &block
#--}}}
end

#recover!Object


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# File 'lib/rq-3.0.0/qdb.rb', line 597

def recover!
#--{{{
  raise 'nested transaction' if @in_transaction
  begin 
    @in_transaction = true
    connect{ execute 'vacuum' }
    require 'timeout'
    Timeout::timeout(60){ system "sqlite #{ @path } .tables >/dev/null 2>&1" }
  ensure
    @in_transaction = false
  end
  integrity_check
#--}}}
end

#retry_if_lockedObject


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# File 'lib/rq-3.0.0/qdb.rb', line 572

def retry_if_locked
#--{{{
  ret = nil
  begin
    ret = yield 
  rescue SQLite::BusyException
    warn{ "database locked - waiting(1.0) and retrying" }
    sleep 1.0 
    retry
  end
  ret
#--}}}
end

#ro_transaction(opts = {}, &block) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 256

def ro_transaction(opts = {}, &block)
#--{{{
  opts['read_only'] = true
  transaction(opts, &block)
#--}}}
end

#rollback_transaction(*a) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 415

def rollback_transaction(*a)
#--{{{
  raise RollbackTransactionError, *a
#--}}}
end

#sillyclean(opts = {}) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 420

def sillyclean opts = {} 
#--{{{
  ro = Util::getopt 'read_only', opts
  ret = nil
  if ro
    ret = yield
  else
    glob = File::join @dirname,'.nfs*'
    orgsilly = Dir[glob]
    ret = yield
    newsilly = Dir[glob]
    silly = newsilly - orgsilly 
    silly.each{|path| FileUtils::rm_rf path}
  end
  ret
#--}}}
end

#transaction(opts = {}) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 262

def transaction opts = {} 
#--{{{
  raise 'nested transaction' if @in_transaction
  ro = Util::getopt 'read_only', opts 
  ret = nil
  begin 
    @in_transaction = true
    lockd_recover_wrap(opts) do
      transaction_wrap(opts) do
        aquire_lock(opts) do
          #sillyclean(opts) do
            connect do
              execute 'begin' unless ro
              ret = yield 
              execute 'commit' unless ro
            end
          #end
        end
      end
    end
  ensure
    @in_transaction = false
  end
  ret
#--}}}
end

#transaction_wrap(opts = {}) ⇒ Object


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# File 'lib/rq-3.0.0/qdb.rb', line 373

def transaction_wrap opts = {} 
#--{{{
  ro = Util::getopt 'read_only', opts
  ret = nil
  if ro
    ret = yield 
  else
    errors = []
    @transaction_retries_sc.reset
    begin
      ret = yield 
    rescue => e
    #rescue SQLite::DatabaseException, SQLite::SQLException, SystemCallError => e
      case e
        when AbortedTransactionError 
          raise
        when RollbackTransactionError 
          raise
        else
          if @transaction_retries == 0
            raise
          elsif errors.size >= @transaction_retries
            error{ "MAXIMUM TRANSACTION RETRIES SURPASSED" }
            raise
          else
            warn{ e } if(errors.empty? or not Util::erreq(errors[-1], e))
            errors << e
            warn{ "retry <#{ errors.size }>..." }
          end
          sleep @transaction_retries_sc.next
          retry
        end
    end
  end
  ret
#--}}}
end

#vacuumObject


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# File 'lib/rq-3.0.0/qdb.rb', line 585

def vacuum
#--{{{
  raise 'nested transaction' if @in_transaction
  begin 
    @in_transaction = true
    connect{ execute 'vacuum' }
  ensure
    @in_transaction = false
  end
  self
#--}}}
end