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// yt - A fully featured command line YouTube client
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Yt.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
// This file is taken from: https://github.com/dylanbstorey/pyo3-pylogger/blob/d89e0d6820ebc4f067647e3b74af59dbc4941dd5/src/lib.rs
// It is licensed under the Apache 2.0 License, copyright up to 2024 by Dylan Storey
// It was modified by Benedikt Peetz 2024, 2025
use log::{Level, MetadataBuilder, Record, logger};
use rustpython::vm::{
PyObjectRef, PyRef, PyResult, VirtualMachine,
builtins::{PyInt, PyList, PyStr},
convert::ToPyObject,
function::FuncArgs,
};
/// Consume a Python `logging.LogRecord` and emit a Rust `Log` instead.
fn host_log(mut input: FuncArgs, vm: &VirtualMachine) -> PyResult<()> {
let record = input.args.remove(0);
let rust_target = {
let base: PyRef<PyStr> = input.args.remove(0).downcast().expect("Should be a string");
base.as_str().to_owned()
};
let level = {
let level: PyRef<PyInt> = record
.get_attr("levelno", vm)?
.downcast()
.expect("Should always be an int");
level.as_u32_mask()
};
let message = {
let get_message = record.get_attr("getMessage", vm)?;
let message: PyRef<PyStr> = get_message
.call((), vm)?
.downcast()
.expect("Downcasting works");
message.as_str().to_owned()
};
let pathname = {
let pathname: PyRef<PyStr> = record
.get_attr("pathname", vm)?
.downcast()
.expect("Is a string");
pathname.as_str().to_owned()
};
let lineno = {
let lineno: PyRef<PyInt> = record
.get_attr("lineno", vm)?
.downcast()
.expect("Is a number");
lineno.as_u32_mask()
};
let logger_name = {
let name: PyRef<PyStr> = record
.get_attr("name", vm)?
.downcast()
.expect("Should be a string");
name.as_str().to_owned()
};
let full_target: Option<String> = if logger_name.trim().is_empty() || logger_name == "root" {
None
} else {
// Libraries (ex: tracing_subscriber::filter::Directive) expect rust-style targets like foo::bar,
// and may not deal well with "." as a module separator:
let logger_name = logger_name.replace('.', "::");
Some(format!("{rust_target}::{logger_name}"))
};
let target = full_target.as_deref().unwrap_or(&rust_target);
// error
let error_metadata = if level >= 40 {
MetadataBuilder::new()
.target(target)
.level(Level::Error)
.build()
} else if level >= 30 {
MetadataBuilder::new()
.target(target)
.level(Level::Warn)
.build()
} else if level >= 20 {
MetadataBuilder::new()
.target(target)
.level(Level::Info)
.build()
} else if level >= 10 {
MetadataBuilder::new()
.target(target)
.level(Level::Debug)
.build()
} else {
MetadataBuilder::new()
.target(target)
.level(Level::Trace)
.build()
};
logger().log(
&Record::builder()
.metadata(error_metadata)
.args(format_args!("{}", &message))
.line(Some(lineno))
.file(None)
.module_path(Some(&pathname))
.build(),
);
Ok(())
}
/// Registers the `host_log` function in rust as the event handler for Python's logging logger
/// This function needs to be called from within a pyo3 context as early as possible to ensure logging messages
/// arrive to the rust consumer.
///
/// # Panics
/// Only if internal assertions fail.
#[allow(clippy::module_name_repetitions)]
pub(super) fn setup_logging(vm: &VirtualMachine, target: &str) -> PyResult<PyObjectRef> {
let logging = vm.import("logging", 0)?;
let scope = vm.new_scope_with_builtins();
for (key, value) in logging.dict().expect("Should be a dict") {
let key: PyRef<PyStr> = key.downcast().expect("Is a string");
scope.globals.set_item(key.as_str(), value, vm)?;
}
scope
.globals
.set_item("host_log", vm.new_function("host_log", host_log).into(), vm)?;
let local_scope = scope.clone();
vm.run_code_string(
local_scope,
format!(
r#"
class HostHandler(Handler):
def __init__(self, level=0):
super().__init__(level=level)
def emit(self, record):
host_log(record,"{target}")
oldBasicConfig = basicConfig
def basicConfig(*pargs, **kwargs):
if "handlers" not in kwargs:
kwargs["handlers"] = [HostHandler()]
return oldBasicConfig(*pargs, **kwargs)
"#
)
.as_str(),
"<embedded logging inintializing code>".to_owned(),
)?;
let all: PyRef<PyList> = logging
.get_attr("__all__", vm)?
.downcast()
.expect("Is a list");
all.borrow_vec_mut().push(vm.new_pyobj("HostHandler"));
// {
// let logging_dict = logging.dict().expect("Exists");
//
// for (key, val) in scope.globals {
// let key: PyRef<PyStr> = key.downcast().expect("Is a string");
//
// if !logging_dict.contains_key(key.as_str(), vm) {
// logging_dict.set_item(key.as_str(), val, vm)?;
// }
// }
//
// for (key, val) in scope.locals {
// let key: PyRef<PyStr> = key.downcast().expect("Is a string");
//
// if !logging_dict.contains_key(key.as_str(), vm) {
// logging_dict.set_item(key.as_str(), val, vm)?;
// }
// }
// }
Ok(scope.globals.to_pyobject(vm))
}
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