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import os |
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import sys |
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# ---------------------------------------------------------------------------------------------------------------------- |
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HOME = os.path.realpath(os.path.dirname(os.path.realpath(__file__)) + '/../..') |
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CONTROLLER_PULL_END_POINT = 'tcp://127.0.0.1:7771' |
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CONTROLLER_LOCKSTEP_END_POINT = 'tcp://127.0.0.1:7772' |
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LOGGER_PULL_END_POINT = 'tcp://127.0.0.1:7773' |
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SPAWNER_PULL_END_POINT = 'tcp://127.0.0.1:7774' |
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MYSQL_HOSTNAME = '127.0.0.1' |
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MYSQL_USERNAME = 'enarksh_owner' |
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MYSQL_PASSWORD = 'cH5thast2stebeT3' |
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MYSQL_SCHEMA = 'enarksh' |
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MYSQL_PORT = 3306 |
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CHUNK_SIZE = 1024 * 1024 |
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ENK_RST_ID_COMPLETED = 3 |
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ENK_RST_ID_ERROR = 4 |
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ENK_RST_ID_QUEUED = 5 |
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ENK_RST_ID_RUNNING = 2 |
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ENK_RST_ID_WAITING = 1 |
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ENK_ACT_ID_TRIGGER = 1 |
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ENK_ACT_ID_RESTART = 2 |
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ENK_ACT_ID_RESTART_FAILED = 3 |
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ENK_PTT_ID_INPUT = 1 |
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ENK_PTT_ID_OUTPUT = 2 |
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ENK_RWS_ID_NONE = 1 |
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ENK_RWS_ID_READ = 2 |
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ENK_RWS_ID_WRITE = 3 |
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ENK_RTP_ID_COUNTING = 1 |
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ENK_RTP_ID_READ_WRITE = 2 |
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ENK_CTP_ID_COUNTING = 1 |
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ENK_CTP_ID_READ_WRITE = 2 |
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ENK_NTP_SCHEDULE = 1 |
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ENK_NTP_COMMAND_JOB = 2 |
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ENK_NTP_COMPOUND_JOB = 3 |
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ENK_NTP_MANUAL_TRIGGER = 4 |
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ENK_NTP_TERMINATOR = 5 |
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ENK_NTP_DYNAMIC_JOB = 6 |
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ENK_NTP_DYNAMIC_OUTER_WORKER = 7 |
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ENK_NTP_DYNAMIC_INNER_WORKER = 8 |
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ENK_MESSAGE_ADMIN_DIR = HOME + '/var/lib/message/admin' |
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ENK_MESSAGE_CONTROLLER_DIR = HOME + '/var/lib/message/controller' |
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ENK_MESSAGE_LOGGER_DIR = HOME + '/var/lib/message/logger' |
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ENK_MESSAGE_SPAWNER_DIR = HOME + '/var/lib/message/spawner' |
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ENK_LOCK_DIR = HOME + '/var/lock' |
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# ---------------------------------------------------------------------------------------------------------------------- |
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def daemonize(pid_filename, stdin, stdout, stderr): |
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""" |
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Turns the current process into a daemon process. |
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Note: Call this function before opening files or create (database) connections. |
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:param str pid_filename: The filename where the PID of the daemon process must be stored. |
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:param str stdin: |
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:param str stdout: |
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:param str stderr: |
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""" |
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if os.path.exists(pid_filename): |
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file = open(pid_filename, 'r') |
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pid = file.read() |
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try: |
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os.kill(int(pid), 0) |
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# No exception. This means a process with pid is already running. |
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raise RuntimeError('Already running') |
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except ProcessLookupError: |
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# Ignore No such process error. This means process it not running. |
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pass |
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# Fork the current process (detaches from parent) |
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if os.fork() > 0: |
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# Exit the parent process. |
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raise SystemExit(0) |
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# Change the working directory. |
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os.chdir(HOME) |
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# Reset the file mode mask. |
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os.umask(0) |
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# Become the session leader. |
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os.setsid() |
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# Flush I/O buffers |
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sys.stdout.flush() |
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sys.stderr.flush() |
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# Replace file descriptors for stdin, stdout, and stderr |
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with open(stdin, 'rb', 0) as f: |
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os.dup2(f.fileno(), sys.stdin.fileno()) |
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with open(stdout, 'ab', 0) as f: |
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os.dup2(f.fileno(), sys.stdout.fileno()) |
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with open(stderr, 'ab', 0) as f: |
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os.dup2(f.fileno(), sys.stderr.fileno()) |
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# Write the PID file |
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with open(pid_filename, 'w') as f: |
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print(os.getpid(), file=f) |
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# ---------------------------------------------------------------------------------------------------------------------- |
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SetBased /
py-enarksh
