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| 1 | +#!/usr/bin/env python2 |
| 2 | + |
| 3 | +try: |
| 4 | + import imp |
| 5 | + import signal |
| 6 | + import subprocess |
| 7 | + import sys |
| 8 | + import syslog |
| 9 | + from swsscommon import swsscommon |
| 10 | +except ImportError, e: |
| 11 | + raise ImportError (str(e) + " - required module not found") |
| 12 | + |
| 13 | +#============================= Constants ============================= |
| 14 | + |
| 15 | +# Platform root directory inside docker |
| 16 | +PLATFORM_ROOT_DOCKER = "/usr/share/sonic/platform" |
| 17 | +SONIC_CFGGEN_PATH = '/usr/local/bin/sonic-cfggen' |
| 18 | +HWSKU_KEY = 'DEVICE_METADATA.localhost.hwsku' |
| 19 | +PLATFORM_KEY = 'DEVICE_METADATA.localhost.platform' |
| 20 | + |
| 21 | +class DaemonBase(object): |
| 22 | + # Redis DB information |
| 23 | + redis_hostname = "localhost" |
| 24 | + redis_port = 6379 |
| 25 | + redis_timeout_msecs = 0 |
| 26 | + |
| 27 | + def __init__(self): |
| 28 | + self.log_info("Starting up...") |
| 29 | + # Register our signal handlers |
| 30 | + signal.signal(signal.SIGHUP, self.signal_handler) |
| 31 | + signal.signal(signal.SIGINT, self.signal_handler) |
| 32 | + signal.signal(signal.SIGTERM, self.signal_handler) |
| 33 | + |
| 34 | + def __del__(self): |
| 35 | + self.log_error("Return from daemon, exiting...") |
| 36 | + |
| 37 | + def run(self): |
| 38 | + raise NotImplementedError() |
| 39 | + |
| 40 | + # ========================== Connect to DB ============================ |
| 41 | + def db_connect(self, db): |
| 42 | + return swsscommon.DBConnector(db, |
| 43 | + self.redis_hostname, |
| 44 | + self.redis_port, |
| 45 | + self.redis_timeout_msecs) |
| 46 | + |
| 47 | + # ========================== Syslog wrappers ========================== |
| 48 | + def log_info(self, msg): |
| 49 | + syslog.openlog() |
| 50 | + syslog.syslog(syslog.LOG_INFO, msg) |
| 51 | + syslog.closelog() |
| 52 | + |
| 53 | + def log_warning(self, msg): |
| 54 | + syslog.openlog() |
| 55 | + syslog.syslog(syslog.LOG_WARNING, msg) |
| 56 | + syslog.closelog() |
| 57 | + |
| 58 | + def log_error(self, msg): |
| 59 | + syslog.openlog() |
| 60 | + syslog.syslog(syslog.LOG_ERR, msg) |
| 61 | + syslog.closelog() |
| 62 | + |
| 63 | + #========================== Signal Handling ========================== |
| 64 | + def signal_handler(self, sig, frame): |
| 65 | + if sig == signal.SIGHUP: |
| 66 | + self.log_info("Caught SIGHUP - ignoring...") |
| 67 | + return |
| 68 | + elif sig == signal.SIGINT: |
| 69 | + self.log_info("Caught SIGINT - exiting...") |
| 70 | + sys.exit(128 + sig) |
| 71 | + elif sig == signal.SIGTERM: |
| 72 | + self.log_info("Caught SIGTERM - exiting...") |
| 73 | + sys.exit(128 + sig) |
| 74 | + else: |
| 75 | + self.log_warning("Caught unhandled signal '" + sig + "'") |
| 76 | + return |
| 77 | + |
| 78 | + #============ Functions to load platform-specific classes ============ |
| 79 | + # Returns platform and HW SKU |
| 80 | + def get_platform_and_hwsku(self): |
| 81 | + try: |
| 82 | + proc = subprocess.Popen([SONIC_CFGGEN_PATH, '-H', '-v', PLATFORM_KEY], |
| 83 | + stdout=subprocess.PIPE, |
| 84 | + shell=False, |
| 85 | + stderr=subprocess.STDOUT) |
| 86 | + stdout = proc.communicate()[0] |
| 87 | + proc.wait() |
| 88 | + platform = stdout.rstrip('\n') |
| 89 | + |
| 90 | + proc = subprocess.Popen([SONIC_CFGGEN_PATH, '-d', '-v', HWSKU_KEY], |
| 91 | + stdout=subprocess.PIPE, |
| 92 | + shell=False, |
| 93 | + stderr=subprocess.STDOUT) |
| 94 | + stdout = proc.communicate()[0] |
| 95 | + proc.wait() |
| 96 | + hwsku = stdout.rstrip('\n') |
| 97 | + except OSError, e: |
| 98 | + self.log_error("Cannot to detect platform") |
| 99 | + raise OSError("Cannot detect platform") |
| 100 | + |
| 101 | + return (platform, hwsku) |
| 102 | + |
| 103 | + # Returns path to hwsku |
| 104 | + def get_path_to_platform_and_hwsku(self): |
| 105 | + # Get platform and hwsku |
| 106 | + (platform, hwsku) = self.get_platform_and_hwsku() |
| 107 | + |
| 108 | + # Load platform module from source |
| 109 | + platform_path = PLATFORM_ROOT_DOCKER |
| 110 | + hwsku_path = "/".join([platform_path, hwsku]) |
| 111 | + |
| 112 | + return (platform_path, hwsku_path) |
| 113 | + |
| 114 | + # Loads platform specific psuutil module from source |
| 115 | + def load_platform_util(self, module_name, class_name): |
| 116 | + platform_util = None |
| 117 | + |
| 118 | + # Get path to platform and hwsku |
| 119 | + (platform_path, hwsku_path) = self.get_path_to_platform_and_hwsku() |
| 120 | + |
| 121 | + try: |
| 122 | + module_file = "/".join([platform_path, "plugins", module_name + ".py"]) |
| 123 | + module = imp.load_source(module_name, module_file) |
| 124 | + except IOError, e: |
| 125 | + self.log_error("Failed to load platform module '%s': %s" % (module_name, str(e))) |
| 126 | + return None |
| 127 | + |
| 128 | + try: |
| 129 | + platform_util_class = getattr(module, class_name) |
| 130 | + platform_util = platform_util_class() |
| 131 | + except AttributeError, e: |
| 132 | + self.log_error("Failed to instantiate '%s' class: %s" % (class_name, str(e))) |
| 133 | + return None |
| 134 | + |
| 135 | + return platform_util |
| 136 | + |
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