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s

Sung Kim

07/09/2023, 6:42 AM
@Marvin how do i create secret block using python
m

Marvin

07/09/2023, 6:42 AM
Ah, the secret's out! Here's how you can create a Secret block in Prefect using Python:
Copy code
python
from prefect import task
from prefect.blocks.system import Secret

@task
def save_secret(name, value):
    Secret(value=value).save(name=name, overwrite=True)

@task
def load_secret(name):
    return Secret.load(name)

@flow
def save_and_load_secret():
    save_secret("my-super-secret", "super secret contents")

    secret: Secret = load_secret("my-super-secret")
    assert secret.get() == "super secret contents", secret

if __name__ == "__main__":
    save_and_load_secret()
This script defines two tasks:
save_secret
and
load_secret
. The
save_secret
task creates a new Secret block with a given name and value, and the
load_secret
task loads a Secret block by its name. The
save_and_load_secret
flow demonstrates how to use these tasks to save a secret and then load it. You can find more details in the Prefect documentation and the source code on GitHub. Remember, with great power comes great responsibility. Use your secrets wisely, or else they might not be secrets for long.
s

Sung Kim

07/11/2023, 4:48 AM
@Marvin Why am I getting this error? Validation of flow parameters failed with error: Traceback (most recent call last): File "/home/sungkim/miniconda3/envs/etl/lib/python3.9/site-packages/prefect/engine.py", line 423, in retrieve_flow_then_begin_flow_run parameters = flow.validate_parameters(flow_run.parameters) File "/home/sungkim/miniconda3/envs/etl/lib/python3.9/site-packages/prefect/flows.py", line 394, in validate_parameters raise ParameterTypeError.from_validation_error(exc) from None prefect.exceptions.ParameterTypeError: Flow run received invalid parameters: - mongodb_host: field required - mongodb_port: field required - mongodb_db: field required - mongodb_collection: field required - rest_url: field required
m

Marvin

07/11/2023, 4:48 AM
Ah, the classic case of missing parameters. It seems your flow is expecting certain parameters that it's not receiving. The parameters in question are
mongodb_host
,
mongodb_port
,
mongodb_db
,
mongodb_collection
, and
rest_url
. When you run your flow, you need to provide these parameters. Here's an example of how you might do this:
Copy code
python
flow.run(
    parameters={
        "mongodb_host": "your_mongodb_host",
        "mongodb_port": "your_mongodb_port",
        "mongodb_db": "your_mongodb_db",
        "mongodb_collection": "your_mongodb_collection",
        "rest_url": "your_rest_url",
    }
)
Replace
"your_mongodb_host"
,
"your_mongodb_port"
,
"your_mongodb_db"
,
"your_mongodb_collection"
, and
"your_rest_url"
with your actual values. Remember, the parameters you pass to
flow.run()
must match the parameters your flow expects. If you're still having trouble, you might want to double-check your flow definition to make sure you've defined all the parameters correctly. And remember, humans, always keep track of your parameters. It's not like they're going to remember themselves.
s

Sung Kim

07/11/2023, 6:05 AM
@Marvin flow.run( AttributeError: 'function' object has no attribute 'run'
m

Marvin

07/11/2023, 6:06 AM
Ah, the elusive attribute error. It's like trying to find a black cat in a coal cellar at midnight. It seems you're trying to call the
run
method on a function object, which doesn't have such an attribute. In Prefect, the
run
method is typically called on a
Flow
object, not a function. Here's an example of how you might define and run a flow:
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python
from prefect import Flow, Parameter

# Define your flow
with Flow("My Flow") as flow:
    x = Parameter("x")

# Run your flow
flow.run(parameters={"x": 42})
In this example,
flow
is an instance of the
Flow
class, which does have a
run
method. If you're still seeing this error, it might be because you're trying to call
run
on a function that's meant to be a task within your flow. In that case, you'll need to include that function in your flow definition and then call
run
on the flow itself. Remember, it's all fun and games until someone loses an attribute.