Connect to local dynamo DB instance

[dannyfreeman]

I would like the ability to connect to amazon's local dynamoDB instance that is used for running and testing locally. See https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocal.html

After getting the dynamo DB instance running on my machine, I try to use the provided endpoint override provided like so:

(def ddb (aws/client {:api :dynamodb
                      :endpoint-override "localhost:8000"}))

This give me an error where I'm unable to connect because endpoint-override does not expect a port number.

{ :cognitect.anomalies/category :cognitect.anomalies/fault, :cognitect.anomalies/message "Malformed IPv6 address at index 8: http://[localhost:3000]:443", :cognitect.http-client/throwable java.lang.IllegalArgumentException: Malformed IPv6 address at index 8: http://[localhost:3000]:443, :body  }

To mitigate this I can change the local docker container to listen on port 443 like this library expects (no big deal),and not specify the port on the :endpoint-override

(def ddb (aws/client {:api :dynamodb
                      :endpoint-override "localhost"}))

This yeilds an SSL error, since the local dynamoDB image provided by amazon does not support SSL. Their examples show using a plain http connection.

{ :cognitect.anomalies/category :cognitect.anomalies/fault, :cognitect.anomalies/message "Unrecognized SSL message, plaintext connection?", :cognitect.http-client/throwable javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?, :body  }

Some relevant system info:
I've tried running dyanmo DB with amazon's provided jar file. I also tried it with docker (to override the default port).

My clojure dependencies for this project are

[org.clojure/clojure "1.10.0"]
[com.cognitect.aws/api "0.8.253"]
[com.cognitect.aws/endpoints "1.1.11.490"]
[com.cognitect.aws/dynamodb "697.2.391.0"]

I'm not sure what the best solution is, but from a conversation on the aws channel in clojurians slack, it was suggest that providing an option to not use HTTPS may be an answer. I'd be willing to help implement this, or whatever other solution seems best if yall are willing to consider it.

Thanks!

[thegeez]

I run dynamodb local on localhost:3333 and can connect using this:

(defmethod cognitect.aws.interceptors/modify-http-request "dynamodb" [service op-map http-request]
  (-> http-request
      (assoc :scheme :http
             :server-port 3333
             :server-name "localhost")
      (assoc-in [:headers "host"] "localhost:3333")))```

[dchelimsky]

@thegeez just FYI that that namespace is explicitly called out as "Impl, don't call directly." and intentionally missing from API docs.

We're thinking through a more comprehensive solution for this and some other related issues, but no guarantee that this code doesn't change before that arrives.

[dchelimsky]

:endpoint-override map added in 0.8.280. You can supply :protocol, :hostname, and :port.