# tracing-shared-rs
Share a logger between a dylib/cdylib and the main binary
## Usage
```toml
[dependencies]
tracing-shared = "0.1"
```
checkout examples/example.rs
### cdylib's case
```rust
use tracing_shared::SharedLogger;
fn main() {
let dylib = unsafe { libloading::Library::new(dylib) }.expect("error loading dylib");
let setup_logger: FnSetupLogger = unsafe { *dylib.get(b"setup_shared_logger_ref").unwrap() };
let run: FnRun = unsafe { *dylib.get(b"run").unwrap() };
let logger = SharedLogger::new();
setup_logger(&logger);
run("cdylib")
}
```
### dylib's case
```rust
use tracing_shared::SharedLogger;
fn main() {
let logger = SharedLogger::new();
example_lib::setup_shared_logger_ref(&logger);
example_lib::run("dylib");
}
```
### Exported entry points
When you expose functions from your shared library so the host binary can `dlsym`/`GetProcAddress` them, add `#[no_mangle]` to keep the symbol names predictable.
```rust
#[no_mangle]
pub fn run(src: &str) {
println!(
"{} feature = log is enabled: {}",
src,
cfg!(feature = "log")
);
println!("{} println!", src);
tracing::info!("{} tracing::info!", src);
#[cfg(feature = "log")]
log::info!("{} log::info!", src);
}
```