Using Node AWS SDK which supports callbacks and promises.. https://aws.amazon.com/blogs/developer/support-for-promises-in-the-sdk/
Using q as promise library..
AWS.config.setPromisesDependency(q);
const headObjProm = this.s3Client.headObject(headParams).promise();
headObjProm
.then(ret => {
//ret is promise..
})
console logging ret shows..
(resolve, reject) {
self.on('complete', function(resp) {
if (resp.error) {
reject(resp.error);
} else {
resolve(resp.data);
}
});
I was under impression ret would be data or error message?
The documentation on AWS is all done in callback style.
How to use this with promises?
When you're initializing the Q package as the Promise to use, you need to specify the Promise property from Q.
AWS.config.setPromisesDependency(require('Q').Promise);
Since const headObjProm = this.s3Client.headObject(headParams).promise(); is asynchronous, how about say you have this in an async function and use await like so:
`const resolveHeadObject = async()=> await s3Client.headObject(headParams).promise()`
I use the await/async syntax and it works for me.
Don't forget to add .Promise to your Q require as well, if that's necessary.