Fatal error when connecting to DynamoDB.

[ADGrant]

Get Fatal error: Unexpectedly found nil while unwrapping an Optional val

#7 0x00000001018a2f4c in Signers.V4.signedHeaders(url:headers:method:date:bodyData:) at .build/checkouts/aws-sdk-swift-core.git--8673986503349919441/Sources/AWSSDKSwiftCore/Signers/V4.swift:96
#8 0x000000010181e60d in AWSClient.nioRequestWithSignedHeader(:) at .build/checkouts/aws-sdk-swift-core.git--8673986503349919441/Sources/AWSSDKSwiftCore/AWSClient.swift:217
#9 0x000000010181de57 in AWSClient.createNIORequestWithSignedHeader(:) at .build/checkouts/aws-sdk-swift-core.git--8673986503349919441/Sources/AWSSDKSwiftCore/AWSClient.swift:190
#10 0x0000000101819737 in AWSClient.createNioRequest(:) at .build/checkouts/aws-sdk-swift-core.git--8673986503349919441/Sources/AWSSDKSwiftCore/AWSClient.swift:243
#11 0x000000010181d70f in AWSClient.send<A, B>(operation:path:httpMethod:input:) at .build/checkouts/aws-sdk-swift-core.git--8673986503349919441/Sources/AWSSDKSwiftCore/AWSClient.swift:171
#12 0x0000000101094273 in DynamoDB.getItem(:) at .build/checkouts/aws-sdk-swift.git--2129101693774578373/Sources/AWSSDKSwift/Services/DynamoDB/DynamoDB_API.swift:91

code in signedHeaders(url: URL, headers: [String: String], method: String, date: Date = Date(), bodyData: Data) -> [String: String]

      var headersForSign = [
            "x-amz-content-sha256": hexEncodedBodyHash(bodyData),
            "x-amz-date": datetime,
            "Host": url.hostWithPort!, // Forced unwrap fatal error is here 
        ]

[jonnymacs]

@ADGrant can you share your code to initialize DynamoDB? Are you setting the endpoint by any chance?

[ADGrant]

@jonnymacs see the code below. I am setting the end point.

connection = DynamoDB(accessKeyId: "", secretAccessKey: "*", region: .useast1, endpoint: "dynamodb.us-east-1.amazonaws.com")

let userAttr = DynamoDB.AttributeValue(s: user.name)
let query = DynamoDB.GetItemInput(key: ["user" : userAttr], tableName: "people_users")
let result = try connection?.getItem(query);

[jonnymacs]

@ADGrant ok that's what I suspected. Try initializing without the endpoint. This is an optional parameter that is set automatically based on the service and region.

region is also optional, and you can leave it out. The default is .useast1 so you should be good, but if you need to specify a different region this is ideally set by an env variable AWS_DEFAULT_REGION.

If you must set an endpoint (and this is true for any of the services) it must include the protocol. ex: https://dynamodb.us-east-1.amazonaws.com So this is another option.

Meanwhile, there's an argument that force unwrap here is not a good idea. So I will add a guard around this code in a future release to surface a more helpful error.

[ADGrant]

Thanks, I will try that. I agree that force unwrap is not a good idea here (or in most places, particularly on server side code). One thing that would be helpful would be some simple examples using these APIs.

[ADGrant]

Works now. Thank you for the prompt assistance.

[jonnymacs]

@ADGrant you're welcome.

And good suggestion on examples. We'll work on this.

PRs are always welcome too 😃

[adam-fowler]

Closing as I don’t think there is anything to add here