How to trace the cause of an error result?
If you use anyhow you can get this for free! You enable an environment variable: RUST_BACKTRACE=1 cargo +nightly run Also enable the backtrace crate feature.
error-handling
Handling bad messages using Kafka’s Streams API
Right now, Kafka Streams offers only limited error handling capabilities. There is work in progress to simplify this. For now, your overall approach seems to be a good way to go. One comment about handling de/serialization errors: handling those error manually, requires you to do de/serialization “manually”. This means, you need to configure ByteArraySerdes for … Read more
What is the idiomatic way to return an error from a function with no result if successful?
Use fn do_work() -> Result<(), WorkError>. Result<(), WorkError> means you want the work to be done, but it may fail. Option<WorkError> means you want to get an error, but it may be absent. You probably want the work to be done but not to get an error when you write do_work(), so Result<(), WorkError> is … Read more
What is the Rust equivalent to a try-catch statement?
There is no try catch statement in Rust. The closest approach is the ? operator. However, you do not have to create a function and a match statement to resolve it in the end. You can define a closure in your scope and use ? operator inside the closure. Then throws are held in the … Read more
Custom error pages for 404, 500 but where is the default 500 error message coming from?
Our exception_handler gem can be used for Ruby on Rails custom error pages. How It Works All Ruby on Rails exceptions are handled with config.exceptions_app. This is assigned in the config/application.rb or config/environments/*.rb files – it needs to be a callback: config.exceptions_app sets the exceptions application invoked by the ShowException middleware when an exception happens. … Read more
UnhandledPromiseRejectionWarning: Error: You must `await server.start()` before calling `server.applyMiddleware()` at ApolloServer
This is a known bug with an open issue and a merged PR to fix it. For now, you can downgrade to apollo-server-express@^2
How to debug “exit status 1” error when running exec.Command in Golang
The solution is to use the Stderr property of the Command object. This can be done like this: cmd := exec.Command(“find”, “https://stackoverflow.com/”, “-maxdepth”, “1”, “-exec”, “wc”, “-c”, “{}”, “\\”) var out bytes.Buffer var stderr bytes.Buffer cmd.Stdout = &out cmd.Stderr = &stderr err := cmd.Run() if err != nil { fmt.Println(fmt.Sprint(err) + “: ” + stderr.String()) … Read more
How do you define custom `Error` types in Rust?
You implement Error exactly like you would any other trait; there’s nothing extremely special about it: pub trait Error: Debug + Display { fn description(&self) -> &str { /* … */ } fn cause(&self) -> Option<&Error> { /* … */ } fn source(&self) -> Option<&(Error + ‘static)> { /* … */ } } description, cause, … Read more
Go checking for the type of a custom Error
Reading the Blog post further exposes a bit of Go like this: serr, ok := err.(*model.ModelMissingError) This is the comma ok idiom, clearly I need to re do my go lang tour
iOS9 storyboard what is unhandled action (handleNonLaunchSpecificActions)?
There is nothing wrong with your code. This is a logging message internal to Apple, and you should file a radar about it. There are two hints that show that this is probably Apple’s code: The underscore leading the method name _handleNonLaunchSpecificActions:forScene:withTransitionContext:completion is a convention indicating that the method is private/internal to the class that … Read more