X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning-persister%2Fsrc%2Futil.rs;h=25bd00f5e9539ee8b486b79cb7436278015a5698;hb=637fb88037fa329363e4b6462e9ad01f25cb4e41;hp=73b28985bfff6ae8b484e5f0d76c62e4091b3541;hpb=75f77a57088fbb2eac786ed4bae951df16dc7c03;p=rust-lightning diff --git a/lightning-persister/src/util.rs b/lightning-persister/src/util.rs index 73b28985..25bd00f5 100644 --- a/lightning-persister/src/util.rs +++ b/lightning-persister/src/util.rs @@ -2,26 +2,20 @@ extern crate winapi; use std::fs; -use std::path::{Path, PathBuf}; +use std::path::PathBuf; +use std::io::BufWriter; #[cfg(not(target_os = "windows"))] use std::os::unix::io::AsRawFd; +use lightning::util::ser::Writeable; + #[cfg(target_os = "windows")] use { std::ffi::OsStr, std::os::windows::ffi::OsStrExt }; -pub(crate) trait DiskWriteable { - fn write_to_file(&self, writer: &mut fs::File) -> Result<(), std::io::Error>; -} - -pub(crate) fn get_full_filepath(mut filepath: PathBuf, filename: String) -> String { - filepath.push(filename); - filepath.to_str().unwrap().to_string() -} - #[cfg(target_os = "windows")] macro_rules! call { ($e: expr) => ( @@ -39,45 +33,43 @@ fn path_to_windows_str>(path: T) -> Vec(path: PathBuf, filename: String, data: &D) -> std::io::Result<()> { - fs::create_dir_all(path.clone())?; +pub(crate) fn write_to_file(dest_file: PathBuf, data: &W) -> std::io::Result<()> { + let mut tmp_file = dest_file.clone(); + tmp_file.set_extension("tmp"); + + let parent_directory = dest_file.parent().unwrap(); + fs::create_dir_all(parent_directory)?; // Do a crazy dance with lots of fsync()s to be overly cautious here... // We never want to end up in a state where we've lost the old data, or end up using the // old data on power loss after we've returned. // The way to atomically write a file on Unix platforms is: // open(tmpname), write(tmpfile), fsync(tmpfile), close(tmpfile), rename(), fsync(dir) - let filename_with_path = get_full_filepath(path, filename); - let tmp_filename = format!("{}.tmp", filename_with_path.clone()); - { // Note that going by rust-lang/rust@d602a6b, on MacOS it is only safe to use // rust stdlib 1.36 or higher. - let mut f = fs::File::create(&tmp_filename)?; - data.write_to_file(&mut f)?; - f.sync_all()?; + let mut buf = BufWriter::new(fs::File::create(&tmp_file)?); + data.write(&mut buf)?; + buf.into_inner()?.sync_all()?; } // Fsync the parent directory on Unix. #[cfg(not(target_os = "windows"))] { - fs::rename(&tmp_filename, &filename_with_path)?; - let path = Path::new(&filename_with_path).parent().unwrap(); - let dir_file = fs::OpenOptions::new().read(true).open(path)?; + fs::rename(&tmp_file, &dest_file)?; + let dir_file = fs::OpenOptions::new().read(true).open(parent_directory)?; unsafe { libc::fsync(dir_file.as_raw_fd()); } } #[cfg(target_os = "windows")] { - let src = PathBuf::from(tmp_filename.clone()); - let dst = PathBuf::from(filename_with_path.clone()); - if Path::new(&filename_with_path.clone()).exists() { + if dest_file.exists() { unsafe {winapi::um::winbase::ReplaceFileW( - path_to_windows_str(dst).as_ptr(), path_to_windows_str(src).as_ptr(), std::ptr::null(), + path_to_windows_str(dest_file).as_ptr(), path_to_windows_str(tmp_file).as_ptr(), std::ptr::null(), winapi::um::winbase::REPLACEFILE_IGNORE_MERGE_ERRORS, std::ptr::null_mut() as *mut winapi::ctypes::c_void, std::ptr::null_mut() as *mut winapi::ctypes::c_void )}; } else { call!(unsafe {winapi::um::winbase::MoveFileExW( - path_to_windows_str(src).as_ptr(), path_to_windows_str(dst).as_ptr(), + path_to_windows_str(tmp_file).as_ptr(), path_to_windows_str(dest_file).as_ptr(), winapi::um::winbase::MOVEFILE_WRITE_THROUGH | winapi::um::winbase::MOVEFILE_REPLACE_EXISTING )}); } @@ -87,15 +79,17 @@ pub(crate) fn write_to_file(path: PathBuf, filename: String, d #[cfg(test)] mod tests { - use super::{DiskWriteable, get_full_filepath, write_to_file}; + use lightning::util::ser::{Writer, Writeable}; + + use super::{write_to_file}; use std::fs; use std::io; use std::io::Write; use std::path::PathBuf; struct TestWriteable{} - impl DiskWriteable for TestWriteable { - fn write_to_file(&self, writer: &mut fs::File) -> Result<(), io::Error> { + impl Writeable for TestWriteable { + fn write(&self, writer: &mut W) -> Result<(), std::io::Error> { writer.write_all(&[42; 1]) } } @@ -113,7 +107,9 @@ mod tests { let mut perms = fs::metadata(path.to_string()).unwrap().permissions(); perms.set_readonly(true); fs::set_permissions(path.to_string(), perms).unwrap(); - match write_to_file(PathBuf::from(path.to_string()), filename, &test_writeable) { + let mut dest_file = PathBuf::from(path); + dest_file.push(filename); + match write_to_file(dest_file, &test_writeable) { Err(e) => assert_eq!(e.kind(), io::ErrorKind::PermissionDenied), _ => panic!("Unexpected error message") } @@ -131,10 +127,12 @@ mod tests { fn test_rename_failure() { let test_writeable = TestWriteable{}; let filename = "test_rename_failure_filename"; - let path = PathBuf::from("test_rename_failure_dir"); + let path = "test_rename_failure_dir"; + let mut dest_file = PathBuf::from(path); + dest_file.push(filename); // Create the channel data file and make it a directory. - fs::create_dir_all(get_full_filepath(path.clone(), filename.to_string())).unwrap(); - match write_to_file(path.clone(), filename.to_string(), &test_writeable) { + fs::create_dir_all(dest_file.clone()).unwrap(); + match write_to_file(dest_file, &test_writeable) { Err(e) => assert_eq!(e.raw_os_error(), Some(libc::EISDIR)), _ => panic!("Unexpected Ok(())") } @@ -144,16 +142,18 @@ mod tests { #[test] fn test_diskwriteable_failure() { struct FailingWriteable {} - impl DiskWriteable for FailingWriteable { - fn write_to_file(&self, _writer: &mut fs::File) -> Result<(), std::io::Error> { + impl Writeable for FailingWriteable { + fn write(&self, _writer: &mut W) -> Result<(), std::io::Error> { Err(std::io::Error::new(std::io::ErrorKind::Other, "expected failure")) } } let filename = "test_diskwriteable_failure"; - let path = PathBuf::from("test_diskwriteable_failure_dir"); + let path = "test_diskwriteable_failure_dir"; let test_writeable = FailingWriteable{}; - match write_to_file(path.clone(), filename.to_string(), &test_writeable) { + let mut dest_file = PathBuf::from(path); + dest_file.push(filename); + match write_to_file(dest_file, &test_writeable) { Err(e) => { assert_eq!(e.kind(), std::io::ErrorKind::Other); assert_eq!(e.get_ref().unwrap().to_string(), "expected failure"); @@ -170,12 +170,13 @@ mod tests { fn test_tmp_file_creation_failure() { let test_writeable = TestWriteable{}; let filename = "test_tmp_file_creation_failure_filename".to_string(); - let path = PathBuf::from("test_tmp_file_creation_failure_dir"); - - // Create the tmp file and make it a directory. - let tmp_path = get_full_filepath(path.clone(), format!("{}.tmp", filename.clone())); - fs::create_dir_all(tmp_path).unwrap(); - match write_to_file(path, filename, &test_writeable) { + let path = "test_tmp_file_creation_failure_dir"; + let mut dest_file = PathBuf::from(path); + dest_file.push(filename); + let mut tmp_file = dest_file.clone(); + tmp_file.set_extension("tmp"); + fs::create_dir_all(tmp_file).unwrap(); + match write_to_file(dest_file, &test_writeable) { Err(e) => { #[cfg(not(target_os = "windows"))] assert_eq!(e.raw_os_error(), Some(libc::EISDIR));