topaz obsidian
I want to send json with TcpStream and I'm using something like this everytime:
let json_str = serde_json::to_string(&json)?;
stream.write(json_str.as_bytes()).await?;
I want to write an extension to WriteExt like this:
stream.write_json(&json);
And inside of it, it will do exactly written above. Can you give me any idea how can I do it? I tried to write a helper trait but couldn't manage. Thanks a lot!
low kettle
topaz obsidian
you want https://docs.rs/serde_json/latest/serde_json/fn.to_writer.html
Can you give an example?
low kettle
it would be serde_json::to_writer(&mut stream, &json)?;
topaz obsidian
Yeah that is a way, but I'm asking how can I write my own extension trait because I want to add some extra stuff too. For example print something everytime when I send a json. So when I called something like stream.write_json(&json).await?; it should run my custom extension codes and sends the json. Is it possible?
I found something like this bu in async WriteExt it becomes little bit a maze 😄
low kettle
I would recommend starting with writing your own functions
extension traits are another layer of complexity and they only give you .foo() syntax
they do not give you any more power
so just write a function that takes the stream and the json and does the two things you want
oh, I did misunderstand your original question
my answer was about "how can I avoid constructing a temporary string"