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QUESTION
I have a struct Foo
which I want to be serialised as a single two-part string in JSON, e.g. "01abcdef:42"
, but as normal in bincode.
(I need it to be serialized normally in bincode for size reasons. In some cases Bar
or Baz
are large arrays of bytes which take up more than twice the space in hex.)
My current code does just what I want:
...ANSWER
Answered 2021-May-15 at 11:40Something like this should work. You still use the derive to generate a deserialize
function. But since it is a remote derive the type will not implement Deserialize
, but gain an inherent function, which you can call inside the manual Deserialize
implementation.
QUESTION
Suppose I have a trait representing a pure function; memory has been provided for the outputs, and both inputs and outputs are expected to be serde/bincode encoded. Is it possible to make this do what I want, or restructure things to enable the same end idiomatically?
...ANSWER
Answered 2021-May-12 at 06:26There are two issues with your code. First, if you want to be able to mutate the inner references, then you must have a mutable outer reference. IOW, your pure
function should take a &mut[&mut [u8]]
for parameter.
Second, in order to pass the mutable reference to deserialize_into
, you need to reborrow it, to make it clear to the compiler that you are not permanently taking it out of output
:
QUESTION
I'm currently using serde-hex.
...ANSWER
Answered 2021-Apr-18 at 12:37The implementation of a function usable with serde's with-attribute is mostly boilerplate and looks like this. This only differentiates between human-readable and other formats. If you need more fine-grained control, you could branch on a thread-local variable instead.
QUESTION
I have defined the following structs with custom load/save methods using serde and bincode:
...ANSWER
Answered 2021-Mar-24 at 08:59The Read::read()
function pulls some bytes from the source, but it is in no way guaranteed to read all of them. The only guarantee you get is that you will get some bytes if there are any left (at least if your buffer doesn't have length zero).
The easiest way to fix this is to use the std::fs::read()
function instead:
QUESTION
I'm quite new to Rust, I'm mainly a C#, javascript and python developer, so I like to approach things in a OOP way, however I still can't wrap my head around ownership in rust. Especially when it comes to OOP.
I'm writing a TCP server. I have a struct that contains connections (streams) and I read the sockets asynchronously using the mio crate. I understand what the error is telling me, but I have no clue how to fix it. I tried changing the read_message method into a function (without the reference to self), which worked, but the problem with this is that I'll need to access the connections and whatnot from the struct (to relay messages between sockets for example), so this workaround won't be plausible in later versions. Is there an easy fix for this, or is the design inherently flawed?
Here's a snippet that shows what my problem is:
...ANSWER
Answered 2021-Jan-29 at 16:28You are holding a mutable borrow on sock
, which is part of self
, at the moment you try to call self.read_message
. Since you indicated that read_message
needs mutable access to all of self
, you need to make sure you don't have a mutable borrow on sock
anymore at that point.
Fortunately, thanks to non-lexical lifetimes in Rust 2018, that's not hard to do; simply fetch sock
inside the loop:
QUESTION
I want to write a vscode extension that displays the content of a large binary file, written with bincode
:
ANSWER
Answered 2020-Dec-11 at 12:38The issue here is that you are using new PyMyStruct()
instead of PyMyStruct.new()
. In wasm-bindgen's debug mode you will get an error about this at runtime. Using .new()
will fix your issue:
QUESTION
I'm trying to get this custom method in my Model to work:
Model:
...ANSWER
Answered 2020-Nov-03 at 11:00try laravel Appending Values To JSON
ref link https://laravel.com/docs/8.x/eloquent-serialization#appending-values-to-json
QUESTION
I've recently got to grips with custom serialisation/deserialisation: https://stackoverflow.com/a/63846824/129805
I want to use this custom "stringy" serialisation (and des.) only for JSON and RON, while using the #[derive(Serialisation, ...
for all the binary serialisations, such as bincode. (Inflating a two-byte (100, 200)
to seven or more bytes of "100:200"
is pointlessly wasteful.)
I need to do this within a single executable, as server/server comms will be bincode or protobufs, while client/server comms will be JSON.
Both server/server and client/server comms will use the same serialisable structs. i.e. I want a single set of structs for all comms, but they should use custom serialisation for JSON/RON but derived serialisation for bin/protobufs.
How can I do this?
Update:
Here is working code with tests which pass:
...ANSWER
Answered 2020-Sep-15 at 07:08If you're using nightly and are willing to turn on the specialization
feature you can write a function that will tell you if the generic parameter S
is a serde_json::Serializer
QUESTION
There seem to be two similar ways to structure data in Rust:
...ANSWER
Answered 2020-Jul-17 at 06:30Generics usually have better performance since the compiler can generate specialized code for each variant. They also take up slightly less memory, since enums need to store a discriminant to keep track of which variant is currently in use.
OTOH, enums don't need to know the type at compile-time and can even change content-types on the fly during execution.
Another option if you don't want to repeat the ts
field is to use either
:
QUESTION
I have a Rust dynamic library which is intended to be called from any language. The arguments to the exported function are two char *
pointers to memory and two lengths for each piece of memory.
The problem is that from_raw_parts
reduces to a memcpy and can segfault in a variety of dangerous ways if for example the lengths are wrong. I'm then using bincode::deserialize
on the slices to use them as Rust objects. Is there any safer option to deal with incoming raw pointers to memory?
ANSWER
Answered 2020-Jul-01 at 18:24No.
What you are asking doesn't make sense. To some level, the entire reason that Rust the language exists is because raw pointers are inherently dangerous. Rust's references (and their related lifetimes) are a structured way of performing compile-time checks to ensure that a pointer is valid and safe to use.
Once you start using raw pointers, the compiler can no longer help you with those pointers and it's now up to you to ensure that safety is guaranteed.
from_raw_parts
reduces to a memcpy
This doesn't seem correct. No memory should be copied to create a slice. A Rust slice is effectively just a pair of (pointer, length)
— the same things that you are passing in separately. I'd expect those each to be register-sized, so calling memcpy
would be overkill.
Using the resulting slice could possibly involve copying the data, but that's not due to from_raw_parts
anymore.
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