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More realistic error log message

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David Tolnay 2017-05-23 14:19:15 -07:00
parent e9f7a5c519
commit 94689a54d3
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1 changed files with 29 additions and 5 deletions
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src/app.md
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@ -172,20 +172,44 @@ DEBUG:main: Executing query: DROP TABLE students
[![log-badge]][log] [![env_logger-badge]][env_logger] [![cat-debugging-badge]][cat-debugging] [![log-badge]][log] [![env_logger-badge]][env_logger] [![cat-debugging-badge]][cat-debugging]
```rust ```rust
#[macro_use] extern crate log; #[macro_use]
extern crate log;
extern crate env_logger; extern crate env_logger;
#
# #[macro_use]
# extern crate error_chain;
#
# error_chain! {
# foreign_links {
# SetLogger(log::SetLoggerError);
# }
# }
fn main() { fn execute_query(_query: &str) -> Result<()> {
env_logger::init().unwrap(); // Do the thing, or maybe not
error!("this is an error {}", "message"); bail!("I'm afraid I can't do that")
} }
fn run() -> Result<()> {
env_logger::init()?;
let response = execute_query("DROP TABLE students");
if let Err(err) = response {
// Log the error message and continue
error!("Failed to execute query: {}", err);
}
Ok(())
}
#
# quick_main!(run);
``` ```
Run this code with `cargo run` and you should see the following line: Run this code with `cargo run` and you should see the following line:
``` ```
DEBUG:main: this is a debug message DEBUG:main: Failed to execute query: I'm afraid I can't do that
``` ```
[ex-log-mod]: #ex-log-mod [ex-log-mod]: #ex-log-mod