Getting AWS Dynamodb query result as internel server error code : 502 - amazon-web-services

Question

This is my table "odo":
I want to retrive data where deviceId == 'A233' Between two timestamps. I run query inside Lamda Function and testing with API Gateway.
This is query I ran to get the result:
var params = {
TableName: "odo",
KeyConditionExpression: "#deviceId = :deviceIdVal AND #timestamp BETWEEN :sdate AND :edate",
ExpressionAttributeNames: {
"#deviceId": "deviceId",
"#timestamp": "timestamp"
},
ExpressionAttributeValues: {
":deviceIdVal": 'A233',
":sdate": 1110601808,
":edate": 1522902606
}
};
But I get a error as "Internal Server Error" and Error Code : 502
Why this query won't work? What am I missing?
When I ran another query using id field,it work.
module.exports.handler = function (event, context, callback) {
console.log(event);
let _response = "";
let invalid_path_err = {
"Error": "Invalid path request " + event.resource + ', ' +
event.httpMethod
};
if(event.resource === '/odos' && event.httpMethod === "GET"){
var params = {
TableName: "odo",
KeyConditionExpression: "#id = :id",
ExpressionAttributeNames: {
"#id": "id"
},
ExpressionAttributeValues: {
":id": 7
}
};
docClient.query(params, function(err, data) {
if (err) {
console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
} else {
console.log("Query succeeded.",data);
_response = buildOutput(200, data);
return callback(null, _response);
}
});
}
else {
_response = buildOutput(500, {"error 500" : "invalid_path_err"});
return callback(_response, null);
}
};
/* Utility function to build HTTP response for the microservices output */
function buildOutput(statusCode, data) {
let _response = {
statusCode: statusCode,
headers: {
"Access-Control-Allow-Origin": "*"
},
body: JSON.stringify(data)
};
return _response;
};
This is the success result in test method execution in API Gateway:

Answer 1

The problem is that your query is trying to use a table partition key of deviceid and a range key of timestamp. In fact you have a parition key called id and no range key.
You can only use KeyConditionExpression on attributes that are a key, which in your case is the attribute id.
To do your 'query' you need to change KeyConditionExpression to FilterExpression and change query to scan
EDIT:
module.exports.handler = function (event, context, callback) {
console.log(event);
let _response = "";
let invalid_path_err = {
"Error": "Invalid path request " + event.resource + ', ' +
event.httpMethod
};
if(event.resource === '/odos' && event.httpMethod === "GET"){
var params = {
TableName: "odo",
FilterExpression: "#deviceId = :deviceIdVal AND #timestamp BETWEEN :sdate AND :edate",
ExpressionAttributeNames: {
"#deviceId": "deviceId",
"#timestamp": "timestamp"
},
ExpressionAttributeValues: {
":deviceIdVal": 'A233',
":sdate": 1110601808,
":edate": 1522902606
}
};
docClient.scan(params, function(err, data) {
if (err) {
console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
} else {
console.log("Query succeeded.",data);
_response = buildOutput(200, data);
return callback(null, _response);
}
});
}
else {
_response = buildOutput(500, {"error 500" : "invalid_path_err"});
return callback(_response, null);
}
};
/* Utility function to build HTTP response for the microservices output */
function buildOutput(statusCode, data) {
let _response = {
statusCode: statusCode,
headers: {
"Access-Control-Allow-Origin": "*"
},
body: JSON.stringify(data)
};
return _response;
};