在Promise链中调用两种方法

Question

I've the following promise which work well

troces.run(value, "../logs/env.txt")
    .then(function (data) {
        console.log(data);
        return updadeUser(val, arg, args[1])
        // Now here I need to add new method updateAddress(host,port,addr)

    }).catch(function (err) {
        console.error(err);
    });

Now I need to add additional method call inside the the first .then that the update user and the updateAddress will work together

My question are

1. assume that updateUser will need to start 10 ms after the update address How is it recommended to do so?

2. in aspects of error handling if one of the process failed (send error message ) I Need to exit ( process.exit(1); )

Answer 1

Use .all :

troces.run(value, "../logs/env.txt")
.then(data => {
    console.log(data);
    return Promise.all([updadeUser(val, arg, args[1]),
                        updateAddress(host,port,addr)]);
}); // no need to add catches bluebird will log errors automatically

If you really need the 10ms delay, you can do:

troces.run(value, "../logs/env.txt")
.then(data => {
    console.log(data);
    return Promise.all([updadeUser(val, arg, args[1]),
                        Promise.delay(10).then(x => updateAddress(host,port,addr))]);
}); // no need to add catches bluebird will log errors automatically

Although I suspect that you really just want updateUser to happen before updateAddress which can be easily solved with:

troces.run(value, "../logs/env.txt")
.then(data => {
    console.log(data);
    return updadeUser(val, arg, args[1]).then(_ => updateAddress(host,port,addr));
}); // no need to add catches bluebird will log errors automatically

If you need to exit on promise error, you can do:

process.on("unhandledRejection", () => process.exit(1)); 

Although I warmly recommend you create meaningful error messages, just a non-zero process exit code is hard to debug.