Catching Uncaught Error in my async await function - node.js

Question

I am trying to use async/await keywords with Redis and NodeJS. I can catch simple errors but I can't catch exceptions coming from getKeys function. Following mocha test fails. My catch block is also not called. I am using NodeJS v9.3.0 and bluebird v3.5.1 and redis 2.8.0
const redis = require("redis");
const bluebird = require("bluebird");
const assert = require('assert');
bluebird.promisifyAll(redis.RedisClient.prototype);
class RedisManager {
constructor(host) {
this.client = redis.createClient({'host':host});
}
async getKeys(key) {
let result = await this.client.hgetallAsync(key);
return result;
}
async simple(key) {
throw Error('Simple Error: ' + key)
}
}
describe('Redis Manager Test:', function() {
it('catches simple errors',function (done) {
let manager = new RedisManager('BOGUSHOST');
let key = 'testKey';
manager.simple(key)
.then(function (value) {
console.log('Value: ' + value);
done(value,null)
})
.catch(function (err) {
if (err = Error('Simple Error: ' + key)) {
done(null);
} else {
done(err);
}
})
});
it('catches Redis errors',function(done) {
let manager = new RedisManager('BOGUSHOST');
manager.getKeys('Some')
.then(function(value) {
console.log('Value: ' + value);
done(value,null)
})
.catch(function (err) {
console.log('Caught Error: ' + err);
done(err,null);
})
})
});

Answer 1

You should use try/catch block to handle Uncaught error rejection when using async/await.
async getKeys(key) {
let result = await this.client.hgetallAsync(key);
try {
return result;
}
catch (err) {
return err;
}
}