I am trying to run an azure function locally on my laptop using the Azure Functions Core Tools. Notice that this function is configured as a cosmosDB trigger
I was partially inspired by the instructions in this tutorial
I started by creating a function called MyFirstFunction with the following commands (and inserting the required inputs when prompted):
func init
func start
My generated javascript function is (the same the Azure portal creates for the same kind of template function):
module.exports = function (context, documents) {
if (!!documents && documents.length > 0) {
context.log('Document Id: ', documents[0].id);
}
context.done();
}
My generated function.json is:
{
"bindings":
[
{
"type": "cosmosDBTrigger",
"name": "documents",
"direction": "in",
"leaseCollectionName": "leases"
}
]
}
My generated local.settings.json is
{
"IsEncrypted": false,
"Values": {
"FUNCTIONS_WORKER_RUNTIME": "node",
"AzureWebJobsStorage": "UseDevelopmentStorage=true"
}
}
Given this setup I try to run the function by executing:
func host start
Everything runs fine in the console output until the error message: Unable to configure binding 'documents' of type 'cosmosDBTrigger'. This may indicate invalid function.json properties. Can't figure out which ctor to call.
What I missing? I was supposed to trigger the function through an http POST to:
http://localhost:{port}/admin/functions/{function_name}
as explained in the tutorial linked above (being this function a cosmosDB trigger) but the function cannot even be loaded after this error.
What am I missing to run a cosmosDB trigger locally?
Many thanks.