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momlib.py
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momlib.py
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from collections import namedtuple
import json
import time
import requests
import asyncio
import grpc
import messages_pb2
import messages_pb2_grpc
MoMInfo = namedtuple("MoMInfo", ["host", "port"])
Channel = namedtuple("Channel", ["id", "topic"])
class MoMClient:
_http_host = None
_http_port = None
def __init__(self, http_host, http_port):
self._http_host = http_host
self._http_port = http_port
def create_queue(self, queue_label):
response = requests.post(f"{self.root()}/queues/{queue_label}")
print(f"Response Status: {response.status_code}")
print(f"Response body: {response.text}")
def delete_queue(self, queue_label):
response = requests.delete(f"{self.root()}/queues/{queue_label}")
print(f"Response Status: {response.status_code}")
print(f"Response body: {response.text}")
def create_channel(self, queue_label, topic="__none__"):
headers = {"Content-type": "application/json"}
response = requests.put(
f"{self.root()}/queues/{queue_label}/channels/{topic}", headers=headers
)
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return (
MoMInfo(data["host"], data["port"]),
Channel(data["id"], data["topic"]),
)
except:
return None
def delete_channel(self, channel_id):
response = requests.delete(f"{self.root()}/channels/{channel_id}")
print(f"Response Status: {response.status_code}")
print(f"Response body: {response.text}")
def get_channel_info(self, channel_id):
response = requests.get(f"{self.root()}/channels/{channel_id}")
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return (
MoMInfo(data["host"], data["port"]),
Channel(data["id"], data["topic"]),
)
except:
return None
def get_queue_info(self, queue_label):
response = requests.get(f"{self.root()}/queues/{queue_label}")
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return (data["label"], MoMInfo(data["host"], data["port"]))
except:
return None
def get_queue_topics(self, queue_label):
response = requests.get(f"{self.root()}/queue/{queue_label}/topics")
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return data
except:
return None
def list_channels(self):
response = requests.get(f"{self.root()}/channels")
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return data
except:
return None
def list_queues(self):
response = requests.get(f"{self.root()}/queues")
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return data
except:
return None
def list_channels(self):
response = requests.get(f"{self.root()}/channels")
print(f"Response Status: {response.status_code}")
try:
data = response.json()
print(f"Response body: {data}")
return data
except:
return None
# Helpers
def root(self):
return f"http://{self._http_host}:{self._http_port}"
class Pusher:
_pusher = None
_grpc_channel = None
def __init__(self, mom_info):
self._grpc_channel = grpc.insecure_channel(f"{mom_info.host}:{mom_info.port}")
self._pusher = messages_pb2_grpc.MessageStreamStub(self._grpc_channel)
self._pusher.GetHeartbeat(messages_pb2.HeartbeatRequest())
def push(self, content, queue_label, topic="__none__"):
self._pusher.PushToQueue(
messages_pb2.Push(content=content, topic=topic, queue_label=queue_label)
)
print("Message pushed...")
def close(self):
self._grpc_channel.close()
class Subscriber:
_mom_info = None
_channel_id = None
def __init__(self, mom_info, channel):
self._mom_info = mom_info
self._channel_id = channel.id
def consume(self, on_message):
async def run():
async with grpc.aio.insecure_channel(
f"{self._mom_info.host}:{self._mom_info.port}"
) as channel:
stub = messages_pb2_grpc.MessageStreamStub(channel)
message_stream = stub.SubscribeToChannel(
messages_pb2.SubscriptionRequest(channel_id=self._channel_id)
)
while True:
res = await message_stream.read()
if res == grpc.aio.EOF:
break
on_message({"id": res.id, "content": res.content})
asyncio.run(run())