Added first draft version of cta-fst-gc

CMakeLists.txt

@@ -143,6 +143,7 @@ ELSE(DEFINED PackageOnly)
   add_subdirectory(eos)
   add_subdirectory(mediachanger)
   add_subdirectory(objectstore)
+  add_subdirectory(python)
   add_subdirectory(rdbms)
   add_subdirectory(scheduler)
   add_subdirectory(tapeserver)
@@ -169,6 +170,7 @@ if (${COMPILE_PACKAGING} STREQUAL "1")
     RPMTools_ADD_RPM_TARGETS(
       ${PROJECT_NAME} ${PROJECT_NAME}.spec.in)
   endif (RPMTools_FOUND)
+  add_dependencies(cta_rpm cta_python_package_rpm)
 endif (${COMPILE_PACKAGING} STREQUAL "1")
 
 #add_custom_target(test test/castorUnitTests

cmake/Findpython.cmake

+# The CERN Tape Archive(CTA) project
+# Copyright(C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This module will set the following variables:
+#     PYTHON_FOUND
+#     PYTHON_PROGRAM
+
+find_program(PYTHON_PROGRAM python)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(python DEFAULT_MSG
+  PYTHON_PROGRAM)

cta.spec.in

@@ -383,3 +383,26 @@ Common items such as the creation of the cta local user and /var/log/cta
 %files -n cta-common
 %defattr(-,root,root)
 %attr(0755,cta,tape) %dir /var/log/cta
+
+%package -n cta-fst-gcd
+Summary: Tape aware garbage collector daemon to run on an EOS FST
+Group: Application/CTA
+Requires: eos-client
+Requires: python
+Requires: python-cta = %{version}-%{release}
+%description -n cta-fst-gcd
+cta-fst-gcd is a daemon that runs on an EOS FST and garbage
+collects EOS disk copies that have been safely stored to tape.
+%files -n cta-fst-gcd
+%defattr(-,root,root)
+%attr(0755,root,root) /usr/bin/cta-fst-gcd
+%attr(0644,root,root) %doc /usr/share/man/man1/cta-fst-gcd.1cta.gz
+%attr(0644,root,root) %config(noreplace) /etc/systemd/system/cta-fst-gcd.service
+%post -n cta-fst-gcd
+%systemd_post cta-fst-gcd.service
+%systemdDaemonReload
+%preun -n cta-fst-gcd
+%systemd_preun cta-fst-gcd.service
+%postun -n cta-fst-gcd
+%systemd_postun cta-fst-gcd.service
+%systemdDaemonReload

python/CMakeLists.txt

+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+cmake_minimum_required (VERSION 2.6)
+
+#install (PROGRAMS cta-fst-gcd DESTINATION usr/bin)
+#install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/cta-fst-gcd.1cta DESTINATION /usr/share/man/man1)
+
+add_subdirectory(eosfstgcd)
+add_subdirectory(package)

python/eosfstgcd/CMakeLists.txt

+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+cmake_minimum_required (VERSION 2.6)
+
+install (PROGRAMS cta-fst-gcd DESTINATION usr/bin)
+install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/cta-fst-gcd.1cta DESTINATION /usr/share/man/man1)
+install (FILES cta-fst-gcd.service DESTINATION /etc/systemd/system)

python/eosfstgcd/cta-fst-gcd

+#!/bin/python
+
+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import cta.fst.gc
+
+cta.fst.gc.main()

python/eosfstgcd/cta-fst-gcd.1cta

+.\" The CERN Tape Archive (CTA) project
+.\" Copyright (C) 2015  CERN
+.\"
+.\" This program is free software: you can redistribute it and/or modify
+.\" it under the terms of the GNU General Public License as published by
+.\" the Free Software Foundation, either version 3 of the License, or
+.\" (at your option) any later version.
+.\"
+.\" This program is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+.\" GNU General Public License for more details.
+.\"
+.\" You should have received a copy of the GNU General Public License
+.\" along with this program.  If not, see <http://www.gnu.org/licenses/>.
+.TH CTA-CATALOGUE-SCHEMA-CREATE 1CTA "August 2016" CTA CTA
+.SH NAME
+cta-fst-gcd \- Tape aware garbage collector daemon to run on an EOS FST
+.SH SYNOPSIS
+.BI "cta-fst-gcd [options]"
+
+.SH DESCRIPTION
+\fBcta-fst-gcd\fP is a daemon that runs on an EOS FST and garbage
+collects EOS disk copies that have been safely stored to tape.
+.P
+The \fBcta-fst-gcd\fP daemon scans across every single EOS disk file on
+an FST.  A file is garbage collected if:
+.IP \[bu] 2
+The amount of free space on the corresponding file system is considered
+too low.
+.IP \[bu]
+The file is considered old enough to be garbage collected.
+.P
+The \fBcta-fst-gcd\fP daemon garbage collects an EOS disk file by
+extracting the hexadecimal EOS file identifier from the local disk
+filename and then running \fBeos stagerm fxid:<fid-hex>\fP.
+.P
+.SH OPTIONS
+.TP
+\fB\-h, \-\-help
+Prints the usage message.
+.SH RETURN VALUE
+Zero on success and non-zero on failure.
+
+.SH AUTHOR
+\fBCTA\fP Team

python/eosfstgcd/cta-fst-gcd.service

+[Unit]
+Description=Tape aware garbage collector daemon to run on an EOS FST
+
+[Service]
+ExecStart=/usr/bin/cta-fst-gcd
+LimitCORE=infinity
+Type=simple
+Restart=no
+User=daemon
+Group=daemon
+WorkingDirectory=/tmp
+
+[Install]
+WantedBy=default.target

python/package/CMakeLists.txt

+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+cmake_minimum_required (VERSION 2.6)
+
+find_package (python REQUIRED)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/setup.py.in
+  ${CMAKE_CURRENT_BINARY_DIR}/setup.py)
+
+set (CTA_PYTHON_PACKAGE_SRC_FILES
+  ${CMAKE_CURRENT_SOURCE_DIR}/cta/__init__.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/cta/fst/__init__.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/cta/fst/gc.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/cta/exceptions.py)
+
+set (CTA_PYTHON_PACKAGE_RPMS
+  ${CMAKE_CURRENT_BINARY_DIR}/dist/python-cta-${CTA_VERSION}.${CTA_RELEASE}.noarch.rpm
+  ${CMAKE_CURRENT_BINARY_DIR}/dist/python-cta-${CTA_VERSION}.${CTA_RELEASE}.src.rpm)
+
+add_custom_command(OUTPUT ${CTA_PYTHON_PACKAGE_RPMS}
+  COMMAND ${PYTHON_PROGRAM} ${CMAKE_CURRENT_BINARY_DIR}/setup.py bdist_rpm --release ${CTA_RELEASE}.el7.cern
+  DEPENDS ${CTA_PYTHON_PACKAGE_SRC_FILES})
+
+add_custom_target(cta_python_package_rpm DEPENDS ${CTA_PYTHON_PACKAGE_RPMS})

python/package/README

+The tape aware FST garbage collector implemented under the CERN Tape Archive (CTA) project.

python/package/cta/__init__.py

+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+

python/package/cta/exceptions.py

+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+class UserError(Exception):
+  pass

python/package/cta/fst/__init__.py

+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+

python/package/cta/fst/gc.py

+#!/bin/python
+
+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import datetime
+import getpass
+import logging
+import logging.config
+import os
+import re
+import socket
+import subprocess
+import sys
+import time
+
+from cta.exceptions import UserError
+
+class Gc:
+  def get_env_mgmhost(self):
+    if "EOS_MGM_URL" in self.env:
+      mgm_url = self.env["EOS_MGM_URL"]
+      if mgm_url:
+        return re.sub("^x?root://", "", mgm_url)
+
+  def get_sysconfig_file_mgmhost(self, sysconfig_file):
+    for line in sysconfig_file:
+      mgmhostline = re.match("^EOS_MGM_HOST=.*", line)
+      if mgmhostline:
+        splitmgmhostline = mgmhostline.group(0).split('=')
+        if 2 == len(splitmgmhostline):
+          return splitmgmhostline[1]
+
+  def get_syconfig_mgmhost(self):
+    if os.path.isfile("/etc/sysconfig/eos_env"):
+      sysconfig_file = open("/etc/sysconfig/eos_env", "r")
+      return self.get_sysconfig_file_mgmhost(sysconfig_file)
+
+  def setmgmhost(self):
+    if self.mgmhost:
+      return
+
+    self.mgmhost = self.get_env_mgmhost()
+    if self.mgmhost:
+      return
+
+    self.mgmhost = self.get_syconfig_mgmhost()
+    if self.mgmhost:
+      return
+
+    raise Exception("Failed to determine the MGM host")
+
+  def configureDummyLogging(self):
+    config = {
+      'version': 1,
+      'disable_existing_loggers': False,
+      'loggers': {
+        'gc' : {
+          'level': 'INFO'
+        }
+      }
+    }
+    logging.config.dictConfig(config)
+
+  def configureFileBasedLogging(self):
+    if None == self.logfilepath:
+      raise Exception("Cannot configure file based logging because the log file path has not been set")
+
+    loggingdir = os.path.dirname(self.logfilepath)
+    if not os.path.isdir(loggingdir):
+      raise UserError("The logging directory {} does is not a directory or does not exist".format(loggingdir))
+    if not os.access(loggingdir, os.W_OK):
+      raise UserError("The logging directory {} cannot be written to by {}".format(loggingdir, self.programname))
+
+    config = {
+      'version': 1,
+      'disable_existing_loggers': False,
+      'formatters': { 
+        'stdout': { 
+            'format': '%(asctime)s.%(msecs)03d000 %(levelname)s ' + self.programname +
+              ': LVL="%(levelname)s" PID="%(process)d" TID="%(process)d" MSG="%(message)s"',
+            'datefmt': '%Y/%m/%d %H:%M:%S'
+        }
+      },
+      'handlers': { 
+        'logfile': { 
+          'level': 'INFO',
+          'formatter': 'stdout',
+          'class': 'logging.handlers.TimedRotatingFileHandler',
+          'filename' : self.logfilepath,
+          'when' : 'midnight'
+        }
+      },
+      'loggers': {
+        'gc' : {
+          'handlers': ['logfile'],
+          'level': 'INFO'
+        }
+      }
+    }
+    # Failing to configure the logging system is usually a user error
+    try:
+      logging.config.dictConfig(config)
+    except Exception as err:
+      raise UserError(err)
+
+  def configureLogging(self):
+    if None == self.logfilepath:
+      self.configureDummyLogging()
+    else:
+      self.configureFileBasedLogging()
+
+  def __init__(self, programname, env, minfreebytes, gcagesecs, cmdline_mgmhost = None,
+    logfilepath = '/var/log/eos/fst/cta-fst-gcd.log'):
+    self.programname = programname
+    self.env = env
+    self.minfreebytes = minfreebytes
+    self.gcagesecs = gcagesecs
+    self.cmdline_mgmhost = cmdline_mgmhost
+    self.logfilepath = logfilepath
+    self.fqdn = socket.getfqdn()
+    self.mgmhost = cmdline_mgmhost
+    self.localfilesystempaths = []
+
+  def eosfsls(self, mgmhost):
+    mgmurl = "root://{}".format(mgmhost)
+    cmd = "eos -r 0 0 {} fs ls -m".format(mgmurl)
+    env = os.environ.copy()
+    env["XrdSecPROTOCOL"] = "sss"
+    process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
+    stdout,stderr = process.communicate()
+    if 0 != process.returncode:
+      raise Exception(
+        "\n"
+        "Failed to to execute: {}\n"
+        "Return code         : {}\n"
+        "Return code strerror: {}\n"
+        "Standard error      : {}".format(cmd, process.returncode, os.strerror(process.returncode), stderr))
+  
+    result = []
+    lines = stdout.splitlines();
+    for l in lines:
+      linedict = {}
+      pairs = l.split()
+      for p in pairs:
+        splitpair = p.split('=')
+        if 2 == len(splitpair):
+          linedict[splitpair[0]] = splitpair[1]
+      if linedict:
+        result.append(linedict)
+
+    return result
+
+  def eosstagerrm(self, mgmhost, fxid):
+    logger = logging.getLogger('gc')
+    mgmurl = "root://{}".format(mgmhost)
+    cmd = "eos {} stagerrm fxid:{}".format(mgmurl, fxid)
+    env = os.environ.copy()
+    env["XrdSecPROTOCOL"] = "sss"
+    process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
+    stdout,stderr = process.communicate()
+    if 0 == process.returncode:
+      logger.info("Executed {}".format(cmd))
+
+  def processfile(self, subdir, fstfile):
+    statvfs = os.statvfs(subdir)
+    spaceshouldefreed = statvfs.f_frsize * statvfs.f_bavail > self.minfreebytes
+
+    if spaceshouldefreed:
+      fullpath = os.path.join(subdir,fstfile)
+      statinfo = os.stat(fullpath)
+      now = time.time()
+      agesecs = now - statinfo.st_ctime
+      if agesecs > self.gcagesecs:
+        self.eosstagerrm(self.mgmhost, fstfile)
+
+  def processfssubdir(self, subdir):
+    logger = logging.getLogger('gc')
+    fstfiles = [f for f in os.listdir(subdir)
+      if re.match('^[0-9A-Fa-f]{8}$', f) and os.path.isfile(os.path.join(subdir, f))]
+    for fstfile in fstfiles:
+      self.processfile(subdir, fstfile)
+
+  def processfs(self, path):
+    fssubdirs = [os.path.join(path, f) for f in os.listdir(path)
+      if re.match('^[0-9A-Fa-f]{8}$', f) and os.path.isdir(os.path.join(path, f))]
+    for fssubdir in fssubdirs:
+      self.processfssubdir(fssubdir)
+
+  def logfilesystempaths(self):
+    logger = logging.getLogger('gc')
+    logger.info('Number of local file systems is {}'.format(len(self.localfilesystempaths)))
+    i = 0
+    for path in self.localfilesystempaths:
+      logger.info('Local file system {}: {}'.format(i, path))
+      i = i + 1
+
+  def processallfs(self):
+    filesystems = self.eosfsls(self.mgmhost)
+    newlocalfilesystempaths = [fs["path"] for fs in filesystems if "path" in fs and "host" in fs and self.fqdn == fs["host"]]
+    if newlocalfilesystempaths != self.localfilesystempaths:
+      self.localfilesystempaths = newlocalfilesystempaths
+      self.logfilesystempaths();
+    for path in self.localfilesystempaths:
+      self.processfs(path)
+
+  def logconf(self):
+    logger = logging.getLogger('gc')
+    logger.info("config minfreebytes={}".format(self.minfreebytes))
+    logger.info("config gcagesecs={}".format(self.gcagesecs))
+    logger.info("config mgmhost={}".format(self.mgmhost))
+    logger.info("config logfilepath={}".format(self.logfilepath))
+
+  def run(self):
+    username = getpass.getuser()
+    if 'daemon' != username:
+      raise UserError('{} must be executed as user daemon and not user {}'.format(self.programname, username))
+
+    self.setmgmhost()
+
+    self.configureLogging()
+    logger = logging.getLogger('gc')
+    logger.info('{} started'.format(self.programname))
+    logger.info('The fqdn of this machine is {}'.format(self.fqdn))
+    self.logconf()
+
+    minperiod = 300 # In seconds
+
+    while True:
+      before = time.time()
+      self.processallfs()
+      after = time.time()
+      period = after - before
+      if period < minperiod:
+        sleeptime = minperiod - period
+        logger.debug('Sleeping {} seconds'.format(sleeptime))
+        time.sleep(sleeptime)
+
+def main():
+  programname = 'cta-fst-gcd'
+
+  parser = argparse.ArgumentParser()
+  parser.add_argument("-f", "--minfreebytes", help="The minimum amount of free space in bytes", type=int, default=10*1000*1000*1000)
+  parser.add_argument("-a", "--gcagesecs", help="The age in seconds that a file must have in order to be considered for garbage collection", type=int, default=2*60*60)
+  parser.add_argument("-m", "--mgmhost", help="The EOS MGM host")
+  args = parser.parse_args()
+
+  gc = Gc(programname, os.environ, args.minfreebytes, args.mgmhost)
+
+  try:
+    gc.run()
+  except UserError as err:
+    print "User error: {}".format(err)
+
+if __name__ == '__main__':
+  main()

python/package/cta/fst/test_Gc.py

+#!/bin/python
+
+# The CERN Tape Archive (CTA) project
+# Copyright (C) 2015  CERN
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import cStringIO
+import unittest
+
+from cta.fst.gc import Gc
+
+class GcTestCase(unittest.TestCase):
+  def setUp(self):
+    self.programname = "test"
+    self.minfreebytes = 1
+    self.gcagesecs = 1
+    self.cmdline_mgmhost = None
+    self.logfilepath = None
+
+  def tearDown(self):
+    pass
+
+  def test_get_env_mgmhost_hostname(self):
+    hostname = "hostname";
+    env = {"EOS_MGM_URL" : hostname}
+    gc = Gc(self.programname, env, self.minfreebytes, self.gcagesecs, self.cmdline_mgmhost, self.logfilepath)
+    self.assertEqual(hostname, gc.get_env_mgmhost())
+
+  def test_get_env_mgmhost_root_hostname(self):
+    hostname = "hostname";
+    env = {"EOS_MGM_URL" : "root://" + hostname}
+    gc = Gc(self.programname, env, self.minfreebytes, self.gcagesecs, self.cmdline_mgmhost, self.logfilepath)
+