crates.io | The Rust package registry | DevOps library
kandi X-RAY | crates.io Summary
kandi X-RAY | crates.io Summary
Source code for the default Cargo registry. Viewable online at crates.io.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of crates.io
crates.io Key Features
crates.io Examples and Code Snippets
Community Discussions
Trending Discussions on crates.io
QUESTION
I'm implementing a simple task queue using redis in Rust, but am struggling to deserialize the returned values from redis into my custom types.
In total I thought of 3 approches:
- Deserializing using serde-redis
- Manually implementing the
FromRedisValue
trait - Serializing to String using serde-json > sending as string > then deserializing from string
The 3rd approach worked but feels artificial. I'd like to figure out either 1 or 2, both of which I'm failing at.
Approach 1 - serde-redisI have a simple Task definition:
...ANSWER
Answered 2021-Jun-15 at 09:55Redis doesn't define structured serialization formats. It mostly store strings and integers. So you have to choose or define your format for your struct.
A popular one is JSON, as you noticed, but if you just want to (de)serialize simple pairs of (id, description), it's not very readable nor convenient.
In such a case, you can define your own format, for example the id and the description with a dash in between:
QUESTION
Hey, I am working on putting up a rocket
rest api with a mongodb
database.
I have been able to create a successful connection to the MongoDB Atlas
and put the resulting client into the state management of rocket
via the manage
builder function like this:
ANSWER
Answered 2021-Jun-14 at 20:39This has been resolved. See above for the solution. It is marked with a header saying solution.
QUESTION
ANSWER
Answered 2021-Jun-13 at 18:47In order to understand what's going on, I'll reformat the code a bit in order to make it more clear and explicit:
Your original code:
QUESTION
I am trying to build a POST handler, that receives JSON data with rocket
(version: 0.5.0-rc.1).
This is the code I wrote:
...ANSWER
Answered 2021-Jun-13 at 12:00Your problem is not about lifetimes, you are using the wrong Json
struct. You are using rocket::response::content::Json
, this can be used to set the Content-Type
of a response (see for example this). You want to use rocket::serde::json::Json
:
QUESTION
I am working in an environment where I cannot use heap memory but only stack memory. To not be constrained by the #[no_std]
enviroment I tried to use stack memory as heap memory with the linked-list-allocator crate. This was my approach.
ANSWER
Answered 2021-Apr-02 at 10:11After looking into the code and finding what looks a lot like the default entry point I'll put what I think is the confirmation of my guess as an answer: the global_allocator
must be fully initialised before main
, because the default entry point relies on it and allocates: https://github.com/rust-lang/rust/blob/master/library/std/src/rt.rs#L40-L45
QUESTION
I have some utility functions in tests/utils/mod.rs
that are used by my integration tests, but I also want to create a testing binary that isn't run as part of cargo test
but can use the functions in tests/utils/mod.rs
. It's a utility that is useful for manual testing, but it only makes sense to run it manually; not using libtest.
The only solution I can think of is to put tests/utils/mod.rs
in its own crate, but I'd really like to avoid that because publishing multi-crate workspaces to crates.io is a real pain. Another option would be to just move tests/utils/mod.rs
to src/test_utils/mod.rs
but that is a bit gross.
Is there a better solution? Maybe something using harness
somehow?
ANSWER
Answered 2021-Jun-10 at 17:59If you have a library crate with the following set up, for instance:
QUESTION
Suppose we have two std::collections::HashMap
-s, say HashMap
and HashMap
, and a function Fn(V1, V2) -> R
.
How do I perform an inner join on these hashmaps so that I get HashMap
on their shared keys as a result? Here's a reference implementation to illustrate what I mean:
ANSWER
Answered 2021-Jun-06 at 01:58As the answer you linked mentions, for a hash table, which does not have an inherent ordering, there is no way to do this more efficiently. (Using the hash codes of the objects do not help, because unless you've used an alternate hasher, every HashMap
uses a different hash function, to prevent denial-of-service attacks which submit deliberately colliding hash keys.)
There is one high-level improvement you can make to the algorithm: iterate over the smaller of the two hash tables, since that requires the fewest lookups.
If you have a sorted collection, such as a BTreeMap
, then itertools::Itertools::merge_join_by
can help you implement a merge of sorted data:
QUESTION
I'm using the sqlx crate to interact with a Postgres instance.
I have the following function:
...ANSWER
Answered 2021-Jun-04 at 19:23The macros are only usable with a constant SQL.
If your sql is dynamic, use the query
function:
QUESTION
I'm currently trying to learn Rust (for embedded specifically), coming from a background of C for embedded systems and Python. So far, I've been reading Rust Programming Language and Rust for Embedded, and read a few blog posts on the web.
I want my first project to be a simple "Blinky", where an LED blinks infinitely. I've got an STM32L152CDISCOVERY board with an STM32L152 chip in it (basically same as STM32L151), which is a Cortex M3.
Instead of implementing everything from scratch, I want to leverage existing crates and HALs. I've found two that seem promising: stm32l1 and stm32l1xx-hal. I've tried to read the documentation of each of them and also part of the source code, but I still can't figure out how to use them correctly.
Got a few questions about Rust and about the crates:
I see that
stm32l1xx-hal
has a dependency onstm32l1
. Do I need to add both as a dependency in myCargo.toml
file? Or will that create problems related to ownership?Is this the correct way to add them? Why is the second one added like that
...[dependencies.stm32l1]
?
ANSWER
Answered 2021-May-29 at 19:32I got some help from a Discord community. The answers were (modified a bit by me):
stm32l1xx-hal
already depends onstm32l1
as seen here. There's no need to import it twice. It is enough to add to Cargo.toml:
QUESTION
I added this to my cargo toml file, following the instructions here
...ANSWER
Answered 2021-May-13 at 20:49I am getting this error on Linux as well. This appears to be an issue in the clickhouse crate, but it can be fixed in your Cargo.toml. #[tokio::test]
refers to a macro which requires both the "rt" and "macros" features, but the Cargo.toml file in the clickhouse crate only includes the "rt" feature. In order to add this feature so that the crate will compile, you can add a line to your Cargo.toml for tokio that enables that feature:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install crates.io
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page