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#![crate_name = "file_api"] #![crate_type = "lib"] extern crate hyper; #[macro_use] extern crate log; extern crate reqwest; pub mod buffer; pub mod reader; pub mod file_reader; pub mod http_reader; use std::io::SeekFrom; #[derive(Debug)] pub struct MainReader { pub http_reader: Option<http_reader::HttpReader>, pub file_reader: Option<file_reader::FileReader>, } impl reader::Reader for MainReader { fn new() -> MainReader { MainReader { http_reader: None, file_reader: None, } } fn open(&mut self, filename: &str) -> Result<(), String> { match detect_kind(filename) { ReaderKind::Http => { let mut reader = http_reader::HttpReader::new(); match reader.open(filename) { Ok(()) => { self.http_reader = Some(reader); Ok(()) } Err(msg) => Err(msg), } } ReaderKind::File => { let mut reader = file_reader::FileReader::new(); match reader.open(filename) { Ok(()) => { self.file_reader = Some(reader); Ok(()) } Err(msg) => Err(msg), } } } } fn get_cache_size(&self) -> Option<usize> { if let Some(ref reader) = self.http_reader { return reader.get_cache_size(); } if let Some(ref reader) = self.file_reader { return reader.get_cache_size(); } None } fn set_cache_size(&mut self, cache_size: Option<usize>) { if let Some(ref mut reader) = self.http_reader { reader.set_cache_size(cache_size) } if let Some(ref mut reader) = self.file_reader { reader.set_cache_size(cache_size) } } fn get_max_end_position(&self) -> Option<u64> { if let Some(ref reader) = self.http_reader { return reader.get_max_end_position(); } if let Some(ref reader) = self.file_reader { return reader.get_max_end_position(); } None } fn set_max_end_position(&mut self, max_end_position: Option<u64>) { if let Some(ref mut reader) = self.http_reader { return reader.set_max_end_position(max_end_position); } if let Some(ref mut reader) = self.file_reader { return reader.set_max_end_position(max_end_position); } } fn get_position(&mut self) -> Result<u64, String> { if let Some(ref mut reader) = self.http_reader { return reader.get_position(); } if let Some(ref mut reader) = self.file_reader { return reader.get_position(); } Err("no reader configured".to_string()) } fn get_size(&mut self) -> Result<u64, String> { if let Some(ref mut reader) = self.http_reader { return reader.get_size(); } if let Some(ref mut reader) = self.file_reader { return reader.get_size(); } Err("no reader configured".to_string()) } fn read(&mut self, size: usize) -> Result<Vec<u8>, String> { if let Some(ref mut reader) = self.http_reader { return reader.read(size); } if let Some(ref mut reader) = self.file_reader { return reader.read(size); } Err("no reader configured".to_string()) } fn seek(&mut self, seek: SeekFrom) -> Result<u64, String> { if let Some(ref mut reader) = self.http_reader { return reader.seek(seek); } if let Some(ref mut reader) = self.file_reader { return reader.seek(seek); } Err("no reader configured".to_string()) } } #[derive(Debug, PartialEq, Eq)] enum ReaderKind { Http, File, } fn detect_kind(filename: &str) -> ReaderKind { if filename.starts_with("http://") || filename.starts_with("https://") { return ReaderKind::Http; } ReaderKind::File } pub fn exists(filename: &str) -> bool { match detect_kind(filename) { ReaderKind::Http => http_reader::exists(filename), ReaderKind::File => file_reader::exists(filename), } } #[test] fn detect_file_kind() { let filename = "filename.txt".to_string(); let kind = detect_kind(&filename); assert_eq!(kind, ReaderKind::File); } #[test] fn detect_http_kind() { let filename = "http://source/filename.txt".to_string(); let kind = detect_kind(&filename); assert_eq!(kind, ReaderKind::Http); let filename_https = "https://source/filename.txt".to_string(); let kind_https = detect_kind(&filename_https); assert_eq!(kind_https, ReaderKind::Http); }