Python - topic.subscribe()
Subscribes to a topic.
from nitric.resources import topic
from nitric.application import Nitric
from nitric.context import MessageContext
updates = topic("updates")
@updates.subscribe
async def updates_sub(ctx: MessageContext):
print(ctx.req.data)
Nitric.run()
Parameters
- Name
middleware- Required
- Required
- Type
- Middleware
- Description
The middleware (code) to be triggered by the topic.
Examples
Subscribe to a topic
from nitric.resources import topic
from nitric.application import Nitric
from nitric.context import MessageContext
updates = topic("updates")
@updates.subscribe
async def updates_sub(ctx: MessageContext):
print(ctx.req.data)
Nitric.run()
Notes
- A function may only subscribe to a topic once, if multiple subscribers are required, create them in different services.
- A function may subscribe to OR publish to a topic but not both. This is in place to stop services calling themselves infinitely.