pycolonies/examples/des_executor.py at main · colonyos/pycolonies · GitHub

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from pycolonies import Crypto
from pycolonies import colonies_client
import signal
import os

def calc_ndvi(polygon, product, time):
    print("Calculation NDVI for polygon", polygon, "product", product, "time", time)
    return [0.1, 0.2, 0.3, 0.4, 0.5]

class PythonExecutor:
    def __init__(self):
        colonies, colonyname, colony_prvkey, _, _ = colonies_client()
        self.colonies = colonies
        self.colonyname = colonyname
        self.colony_prvkey = colony_prvkey
        self.executorname = "des-executor"
        self.executortype = "des-executor"

        crypto = Crypto()
        self.executor_prvkey = crypto.prvkey()
        self.executorid = crypto.id(self.executor_prvkey)

        self.register()

    def register(self):
        executor = {
            "executorname": self.executorname,
            "executorid": self.executorid,
            "colonyname": self.colonyname,
            "executortype": self.executortype
        }

        try:
            executor = self.colonies.add_executor(executor, self.colony_prvkey)
            self.colonies.approve_executor(self.colonyname, self.executorname, self.colony_prvkey)

            self.colonies.add_function(self.colonyname,
                                       self.executorname,
                                       "calc_ts",
                                       self.executor_prvkey)
        except Exception as err:
            print(err)
            os._exit(0)

        print("Executor", self.executorname, "registered")

    def start(self):
        while (True):
            try:
                process = self.colonies.assign(self.colonyname, 3, self.executor_prvkey)
                print("Process", process.processid, "is assigned to executor")

                self.colonies.add_log(process.processid, "Calculating NDVI\n", self.executor_prvkey)

                if process.spec is None or len(process.spec.kwargs) == 0:
                    print("invalid process")
                    continue

                polygon = process.spec.kwargs["polygon"]
                product = process.spec.kwargs["product"]
                time = process.spec.kwargs["time"]

                ndvi_serie = calc_ndvi(polygon, product, time)

                if process.spec.funcname == "calc_ts":
                    self.colonies.close(process.processid, ndvi_serie, self.executor_prvkey)
            except Exception as err:
                pass

    def unregister(self):
        self.colonies.remove_executor(self.colonyname, self.executorname, self.colony_prvkey)
        print("Executor", self.executorname, "unregistered")
        os._exit(0)

def sigint_handler(signum, frame):
    executor.unregister()

if __name__ == '__main__':
    signal.signal(signal.SIGINT, sigint_handler)
    executor = PythonExecutor()
    executor.start()