I am playing the aws mobilehub with react-native and I was hoping that it can speed up the backend hosting for me.
However, I cannot get its backend API working. After a long run with their docs, I pin down the problem between its lambda function and dynamodb service.
Any thoughts are greatly appreciated!
As the titled says: my aws lambda functions can request its dynamodb but has no response. What went wrong here? Or how can I get debug info from AWS dynamodb? (I gg and enabled Cloudtrial but it doesn't seem to have operation logs of the dynamodb too.)
Here I have the simplest node.js 6.10 codes:
const AWS = require('aws-sdk');
AWS.config.update({region: 'us-east-2'});
const dynamodb = new AWS.DynamoDB.DocumentClient();
exports.handler = function(event, context, callback) {
var responseCode = 200;
var requestBody, httpMethod, res;
console.log("request: " + JSON.stringify(event));
// Request Body
requestBody = event.body;
/*testing dynamodb with put*/
console.log("PUT begins");
let putItemParams2 = {
TableName: "xxxx-mobilehub-xxxx-Test",//tableName
Item: {businessId:'putItemParams2r3',test:'yooo', hmm:'hhhh'}
};
console.log("putItemParams2: ",putItemParams2);
dynamodb.put(putItemParams2, (err, data) => {
console.log("putItemParams2");
if (err) console.log("dynamodb err: ",err, err.stack); // an error occurred
else console.log("dynamodb data: ",data); // successful response
});
console.log("PUT end");
var response = {
statusCode: responseCode
//....
};
...
//comment out context.succeed here to avoid program termination before intended.
//console.log("response: " + JSON.stringify(response))
//context.succeed(response);
};
When the previouse codes are triggered, from AWS CloudWatch I can see logs:
START RequestId: 3d7c5f7f-1b98-11e8-ad00-93a6d10c8f4e Version: $LATEST
[timestamp] PUT begins
[timestamp] putItemParams2: { TableName: 'xxx-mobilehub-xxxx-Test',
Item: { businessId: 'putItemParams2r3', test: 'yooo', hmm: 'hhhh'}}
[timestamp] put end
END RequestId: 3d7c5f7f-1b98-11e8-ad00-93a6d10c8f4e
So no err, no data, no response. I checked my dynamodb and there is nothing insert.
condition#1: this dynamodb table has public access since I want to rule out the auth problem.
condition#2: I ensure that my lambda function has access to these tables. e.g. arn:aws:dynamodb::xxxx:table/xxxx-mobilehub-xxxx- allow everything
condition#3: I build myself a simple node.js to execute the (aws-sdk)and this server works perfectly fine with the same code.. I am able to "get" &"put" items int & out from my dynamodb table.
my react-native code use 'aws-amplify-react-native'. Which the API.put is fine and the lambda function is at least receiving the api call (from problem#1).
However, API.get returns me 403 error, and the lambda function doesn't even has log for this operation..
async function getBusiness(){
const path = "/Test";
const api = "TestCRUD";
let queryGetBusiness = {body: {userId: "hmmm"}};
try {
let apiResponse = await API.get(api, path, queryGetBusiness)//.then((data)=>{console.log(data)});
let apiResponseJson = await JSON.stringify(apiResponse);
console.log("response from saving Business: " + apiResponseJson);
}
catch (e) {console.log(e);}
}
P.S.(AWS could do much better with this mobilehub.. their documentation is lacking details and awsmobile cloud-api invoke has some problems I guess.)
const AWS = require('aws-sdk');
AWS.config.update({ region: 'us-east-2' });
const dynamodb = new AWS.DynamoDB.DocumentClient();
exports.handler = function (event, context, callback) {
var responseCode = 200;
var requestBody, httpMethod, res;
console.log("request: " + JSON.stringify(event));
// Request Body
requestBody = event.body;
/*testing dynamodb with put*/
console.log("PUT begins");
let putItemParams2 = {
TableName: "xxxx-mobilehub-xxxx-Test",//tableName
Item: { businessId: 'putItemParams2r3', test: 'yooo', hmm: 'hhhh' }
};
console.log("putItemParams2: ", putItemParams2);
dynamodb.put(putItemParams2, (err, data) => {
console.log("putItemParams2");
if (err) console.log("dynamodb err: ", err, err.stack); // an error occurred
else {
console.log("dynamodb data: ", data);
context.succeed(response);
}
// Call these here
console.log("PUT end");
});
//console.log("response: " + JSON.stringify(response))
};
Make sure you call context.succeed
inside the callback function. Like above.
You can also just use the third argument to handler
function - callback
instead of context.succeed
like callback(null, response);
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