While making my personal Slack apps, I found room for improvement in the lazy listener mechanism. The issue can be easily reproduced by running the following code.

The occurrence conditions of this issue are:

• Add custom properties to context object
• Use lazy listeners

Thus, the usage that will be supported by #544 will be also affected.

app = App()

@app.middleware
def set_db_connection(context, next_):
    # When making a deep copy of context fails due to an error "cannot pickle SSLContext object" etc.
    context["s3"] = boto3.client("s3")
    next_()

def just_ack(ack):
    ack()

def do_something(client, body):
    pass

app.command(ack=just_ack, lazy=[do_something])

Category (place an x in each of the [ ])

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Others

Requirements

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