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"""Return the current machine shard value.
This should match the get_shard function from
import hashlib
import objc
from Foundation import NSBundle
def get_serial():
"""Return the machine serial number."""
IOKit_bundle = NSBundle.bundleWithIdentifier_("")
functions = [
("IOServiceGetMatchingService", b"II@"),
("IOServiceMatching", b"@*"),
("IORegistryEntryCreateCFProperty", b"@I@@I"),
objc.loadBundleFunctions(IOKit_bundle, globals(), functions)
kIOMasterPortDefault = 0
kIOPlatformSerialNumberKey = "IOPlatformSerialNumber"
kCFAllocatorDefault = None
platformExpert = IOServiceGetMatchingService(
kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice")
serial = IORegistryEntryCreateCFProperty(
platformExpert, kIOPlatformSerialNumberKey, kCFAllocatorDefault, 0
return serial
def fact():
"""Return the machine shard value based off the serial number."""
serial = get_serial()
if serial is None:
return 0
shard = int(int(hashlib.md5(serial).hexdigest(), 16) % 100)
# we don't want to have a zero shard
return {"shard": shard + 1}
if __name__ == "__main__":