tokio-core | I/O primitives and event loop for async I/O in Rust | Reactive Programming library
kandi X-RAY | tokio-core Summary
kandi X-RAY | tokio-core Summary
I/O primitives and event loop for async I/O in Rust
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Trending Discussions on tokio-core
QUESTION
I am dabbling in tokio-core and can figure out how to spawn an event loop. However there are two things i am not sure of - how to gracefully exit the event loop and how to exit a stream running inside an event loop. For e.g consider this simple piece of code which spawns two listeners into the event loop and waits for another thread to indicate an exit condition:
...ANSWER
Answered 2017-Feb-26 at 16:13The event loop (core) is not being turned any more (e.g. by run()) or is forgotten (drop()ed). There is no synchronous exit. core.run() returns and stops turning the loop when the Future passed to it completes.
A Stream completes by yielding None (marked with (3) in the code below).
When e.g. a TCP connection is closed the Stream representing it completes and the other way around.
QUESTION
With included debug info, my binary becomes 400 MB about. This happens because Rust includes debug info for all dependencies. Is there any way to include debug info only for my code?
...ANSWER
Answered 2019-Oct-30 at 17:49If you're willing to use unstable cargo features with a nightly toolchain, this is possible through the cargo profile dependencies feature, like so:
QUESTION
I got this error:
...ANSWER
Answered 2019-Oct-21 at 13:42You should only include a dependency in a feature list if the dependency is optional. If the dependency is not optional, solely include it in the [dependencies] section.
QUESTION
I am trying to write a simple TCP client in Rust using Tokio crate. My code is pretty close to this example minus the TLS:
...ANSWER
Answered 2018-Nov-22 at 20:46TL;DR: remove the semicolon after io::write_all.
Review the definition of and_then:
QUESTION
I can't seem to figure out how to get Rust to accept a client and proxied client in the same variable. While I am still new to Rust, I have a basic understanding of programming. So far I have tried structs (but no impl's though), type casting, uninitialized variables, but nothing is working.
...ANSWER
Answered 2018-Jun-11 at 14:38This solution is not pretty, but it does work.
We start by creating an enum to handle the two cases:
QUESTION
I'm building a service that periodically makes an HTTP request. I'm using tokio::timer::Delay as a periodic trigger and hyper to make the HTTP call.
Using them together gives me the following error:
...ANSWER
Answered 2018-Jun-04 at 16:45One primary conceptual issue I see is that you should not be creating arbitrary Cores. You want to share these as much as possible because that's how Tokio communicates between different futures.
Creating a single core and using it for the HTTP request and the overall command is the right thing to do.
hyper 0.11hyper 0.11 is not compatible with the tokio crate. Instead, you need to use the component pieces of Tokio:
QUESTION
I'm trying to wrap my head around futures in Rust but I am confused by this code which is supposed to send messages arriving at rx to sink:
ANSWER
Answered 2018-Feb-12 at 05:49QUESTION
I want to make a client request with Hyper 0.11 after I get an incoming request from a user which I handle with rocket and use as few resources as possible. If I can't reuse the Core or the Client, I would have to create them each time Rocket ignites a request. This would take too many resources in an high performance environment to create a Core and a Client each time the server answers a request. so I am using the State to make the object available to all 'ignitions'. In Hyper 0.10.13 it works, but in Hyper 0.11 with Tokio I am getting massive error messages.
Cargo.toml:
...ANSWER
Answered 2017-Dec-03 at 15:44No, you cannot share a hyper::Client between threads. However, you can share a tokio_core Remote:
QUESTION
I want to implement a blocking function that sends a POST request with a JSON body and returns the JSON object of the response:
...ANSWER
Answered 2017-Oct-27 at 09:47request.set_body() takes a parameter that needs to be convertible into hyper::Body (the default for B in hyper::client::Request).
If you take a look at the list of From (the "dual" trait for Into) implementations for hyper::Body you'll see impl From<&'static [u8]> for Body - this is where you're static lifetime requirement comes from (there is no impl<'a> From<&'a [u8]> for Body that would take any other reference to "bytes").
But you'll also see impl From for Body - so it should be fine to just pass msg (which should be a String as far as I can tell) instead of msg.as_bytes() to request.set_body(). It will take ownership of the string msg, so you can't use it yourself afterwards anymore.
QUESTION
I am using tokio's UdpCodec trait:
ANSWER
Answered 2017-Feb-07 at 19:21Expanding on @Josh's suggestion, I would suggest using interning.
Depending on how memory or CPU intensive your task is, make your pick between:
- A double hash-map:
ID<->String, shared between components - A single hash-map:
String->Rc
If you can afford the latter, I definitely advise it. Also note that you can likely fold MetricType within the Rc: Rc<(MetricType, str)>.
Then you still need to call clone left and right, but each is just a cheap non-atomic increment operation... and moving to multithread is as simple as swapping Arc for Rc.
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