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extern crate libc; extern crate time; pub mod cpu; pub mod disk_stats; pub mod disk_usage; mod error; pub mod load; pub mod memory; pub mod network; pub mod process_memory; use std::fs; use std::io; use std::io::BufRead; use std::io::Read; use std::path::Path; use std::result; pub use crate::error::ProbeError; pub type Result<T> = result::Result<T, error::ProbeError>; #[inline] fn file_to_string(path: &Path) -> Result<String> { let mut file = fs::File::open(path).map_err(|e| ProbeError::IO(e, path_to_string(path)))?; let mut read = String::new(); file.read_to_string(&mut read) .map_err(|e| ProbeError::IO(e, path_to_string(path)))?; Ok(read) } #[inline] fn file_to_buf_reader(path: &Path) -> Result<io::BufReader<fs::File>> { fs::File::open(path) .map_err(|e| ProbeError::IO(e, path_to_string(path))) .and_then(|f| Ok(io::BufReader::new(f))) } #[inline] fn path_to_string(path: &Path) -> String { path.to_string_lossy().to_string() } #[inline] fn calculate_time_difference(first_time: u64, second_time: u64) -> Result<u64> { if first_time > second_time { Err(ProbeError::InvalidInput(format!( "first time {} was after second time {}", first_time, second_time ))) } else { Ok(second_time - first_time) } } #[inline] fn time_adjusted( field_name: &str, first_value: u64, second_value: u64, time_difference_ns: u64, ) -> Result<u64> { if first_value < second_value { Err(ProbeError::UnexpectedContent(format!( "First value {} was lower than second value {} for '{}'", first_value, second_value, field_name ))) } else { Ok( ((first_value - second_value) as f64 / time_difference_ns as f64 * 60_000_000_000.0) as u64, ) } } #[inline] fn parse_u64(segment: &str) -> Result<u64> { segment .parse() .map_err(|_| ProbeError::UnexpectedContent(format!("Could not parse '{}' as u64", segment))) } #[inline] fn dir_exists(path: &Path) -> bool { path.exists() && path.is_dir() } #[inline] fn read_file_value_as_u64(path: &Path) -> Result<u64> { let mut reader = file_to_buf_reader(path)?; let mut line = String::new(); reader .read_line(&mut line) .map_err(|e| ProbeError::IO(e, path_to_string(path)))?; parse_u64(&line.trim()) } #[cfg(test)] mod tests { use crate::error::ProbeError; #[test] fn test_calculate_time_difference() { assert_eq!(100, super::calculate_time_difference(100, 200).unwrap()); assert!(super::calculate_time_difference(200, 100).is_err()); } #[test] fn test_time_adjusted() { assert_eq!( 1200, super::time_adjusted("field", 2400, 1200, 60_000_000_000).unwrap() ); assert_eq!( 2400, super::time_adjusted("field", 2400, 1200, 30_000_000_000).unwrap() ); assert_eq!( 4800, super::time_adjusted("field", 2400, 1200, 15_000_000_000).unwrap() ); } #[test] fn test_time_adjusted_first_higher_than_lower() { match super::time_adjusted("field", 1200, 2400, 60_000_000_000) { Err(ProbeError::UnexpectedContent(_)) => (), r => panic!("Unexpected result: {:?}", r), } } #[test] fn test_parse_u64() { assert_eq!(100, super::parse_u64("100").unwrap()); assert!(super::parse_u64("something").is_err()); } }