金庆的专栏

【代码】Rust Closure Variable Capture。

【代码】Convert IO traits between tokio, hyper and futures。

Change。

【代码】Rust integration tests in a separate crate。

【代码】Separate Rust Unit Test。

【代码】Compare smol-hyper and hyper-futures for impl Read。

【代码】Inventing the Service Trait。

【代码】How to set_default() using config-rs crate。

【代码】Return Consumed Argument on Error。

【代码】【无标题】

【代码】async Lifetimes。

(Jin Qing’s Column, Sep., 2024)From: https://doc.rust-lang.org/std/pin/index.htmlRust can pin data location in memory, that means its address can not be changed.Pinned data guarantees the memory location is always valid.Safe code can not move pinned data

【代码】mvcc_cell code review。

【代码】Inline the hot call。

(Jin Qing’s Column, Jan., 2024)From: https://github.com/rust-lang/api-guidelines/discussions/28If the trait has a single self-explanatory method (or a set of nearly identical methods), name it after the method: Clone, Hash, Default, Into, Write, ToOwned, A

【代码】Using anyhow::ensure!()

【代码】Snapshot test with insta。

(Jin Qing’s Column, Jun., 2023)See: https://doc.rust-lang.org/reference/types/impl-trait.htmlGeneric type parameter and parameter are almost equivalent: is just a syntactic sugar for generic type parameter.It is a little simpler by omitting the generic

【代码】Unity WebGL Calls Rust Wasm。

【代码】Implementation of user data in cursive::Cursive。

Rust sometimes needs manual type annotation(Jin Qing’s Column, Apr., 2022)This code compiles error:trait MyCallback: FnMut(&u32) -> () { }impl<F: FnMut(&u32) -> ()> MyCallback for F { }fn process_data(mut f: impl MyCallback) -&gt

How to work around rustup-init failure(Jin Qing’s Column, Mar., 2022)rustup-init.exe may fail if some anti-virus software is running with realtime protection.The error message is like this after many retries:error: could not rename component file from

Closure as the function parameter(Jin Qing’s Column, Mar., 2022)It is best to let the function take a closure trait as the parameter instead of function pointer.fn foo(f: fn()) { f()}fn main() { foo(|| println!("hello")); let a = 123;

deadlock detection must not run as tokio taskparking_lot has an experimental feature: deadlock_detection.See: https://amanieu.github.io/parking_lot/parking_lot/deadlock/index.htmluse std::thread;use std::time::Duration;use parking_lot::deadlock;// C

Tracing usage(Jin Qing’s Column, Jan., 2022)Tracing is Rust log crate: https://github.com/tokio-rs/tracingThis example code output log to stdcout and file, using a log filter file,which can automatically reload on change.https://gitee.com/jinq0123/tra

Try tracing(Jin Qing’s Column, Dec., 2021)https://github.com/tokio-rs/tracingUsage on githubSwitch to tag tracing-0.1.29 first. The master’s examples can not build.Subscriber is renaming to collector on master.tracing::subscriber in 0.1.29 has been r

Box doesn’t implement the traitFrom: https://bennetthardwick.com/dont-use-boxed-trait-objects-for-struct-internals/By default a Box doesn’t implement the trait of the object it contains. This means that trying to construct PeopleZoo<Box> won’t work

建议日志 slog 改换 tracing(金庆的专栏 2021.11)slog 不是立即写盘，最后的几行日志会丢失tracing 不会丢日志slog 不支持运行中动态更改日志等级tracing with_filter_reloading()examples/tower-loadslog 不支持不同包设置不同日志等级tracing 可单独打开某个模块的日志发现一次 slog panic: panicked at 'slog::Fuse Drain: Fatal(Cu

Named parameters in Rust(Jin Qing’s Column, Nov. 18, 2021)There is no “named function parameters” in Rust,but there is an idiom for this case.If a function needs many parameters, we can define a typewith all these parameters as fields, and implement D

Rust traits act as generic constraints(Jin Qing’s Column, Nov. 18, 2021)Rust traits are different from interfaces of C++/Java/Go.See: https://stevedonovan.github.io/rustifications/2018/09/08/common-rust-traits.htmlRust traits are mechanism for adding b

GLIBC_2.29 not found(Jin Qing’s Column, Nov. 4, 2021)My Rust program failed when running in docker:root@a26b49c91efb:/myapp# ldd libmyapp_py.so./libmyapp_py.so: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by ./libmyapp_py.

Display Non-UTF-8 output(Jin Qing’s Column, Oct. 27, 2021)Cargo build output Non-UTF-8. Use python to decode it as gbk and print.C:\Users\jinqing01>python>>> s = b'Non-UTF-8 output: \xd5\xfd\xd4\xda\xb4\xb4\xbd\xa8\xbf\xe2 E:\\gitlab\\myp

Advice for library writersFrom: https://blog.burntsushi.net/rust-error-handling/Idioms for Rust libraries are still forming, but if your library needs to report custom errors, then you should probably define your own error type. It’s up to you whether or

How to show the first few errors of rustc(Jin Qing’s Column, Sep. 1, 2021)When using VS Code to develop Rust, “cargo check” output maybe thousands of lines.Use “cargo check --color=always 2>&1 | head -n100” to limit the output.Change powershell

&'a mut self is restrictiveFrom https://github.com/pretzelhammer/rust-blog/blob/master/posts/common-rust-lifetime-misconceptions.md#5-if-it-compiles-then-my-lifetime-annotations-are-correct#[derive(Debug)]struct NumRef<'a>(&'a i32);impl&

Rust callback idiomCode is from: https://stackoverflow.com/questions/41081240/idiomatic-callbacks-in-rustandhttps://morestina.net/blog/793/closure-lifetimes-in-ruststruct Processor<'a> { callback: Box<dyn FnMut() + 'a>,}impl<'a&gt

Rust variable rebinding for closureFrom: https://rust-unofficial.github.io/patterns/idioms/pass-var-to-closure.htmlRust closure captures variables by reference by default.You can use “move” keyword to change to move variables.In most cases, some variab