def invoke_function(func, interaction_model, env):
"""
Start a gRPC Server to invoke the function
:param func: the function
:param interaction_model: indicates interaction model: None is single value parameter and return type, 'stream' indicates input and output are generators
:param env: a dict containing the runtime environment, usually os.environ
:return: None
"""
grpc_server.run(func, interaction_model, env.get("GRPC_PORT", 10382))
def start_grpc():
# We need to do this because `gunicorn` will spawn a new subprocess ( a worker )
# when running `Flask` server. If we start `gRPC` server before the spawn of
# the subprocess, it's nearly impossible to share the `database` with the new
# subprocess because Python will copy everything in the memory from the parent
# process to the subprocess ( So we have 2 separate instance of `database` ).
# The endpoint will start the `gRPC` server in the same subprocess so there is
# only one instance of `database`.
global grpc_port
if grpc_port == 0:
port = flask.request.args.get("port", "0")
grpc_port = grpc_server.run(port, db)
return str(grpc_port)
return str(grpc_port)
def invoke_function(func):
grpc_server.run(func, os.environ.get("GRPC_PORT", "10382"))
