Rocket - Logging to a file using log4rs

---

• Add log4rs to the dependencies.

examples/rocket/logging-with-log4rs-to-file/Cargo.toml

[package]
name = "logging"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
log4rs = "1.3.0"
rocket = "0.5"

• Create a configuration file:

examples/rocket/logging-with-log4rs-to-file/log4rs.yaml

appenders:
  stdout:
    kind: console
  all:
    kind: file
    path: "all.log"
    encoder:
      pattern: "{d} - {l} {f}:{L} {m}{n}"

root:
  level: debug
  appenders:
    #- stdout
    - all

• Initiate the logging

examples/rocket/logging-with-log4rs-to-file/src/main.rs

#[macro_use]
extern crate rocket;

#[get("/")]
fn index() -> &'static str {
    rocket::trace!("Trace from Hello World");
    rocket::debug!("Debug from Hello World");
    rocket::info!("Info from Hello World");
    rocket::warn!("Warning from Hello World");
    rocket::error!("Error from Hello World");
    "Hello, world!"
}

#[launch]
fn rocket() -> _ {
    log4rs::init_file("log4rs.yaml", Default::default()).unwrap();
    rocket::build().mount("/", routes![index])
}