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rearrange some methods to make structure clearer

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This commit is contained in:
Damien Elmes 2020-01-30 11:46:42 +10:00
parent 01470c4854
commit 10f64d54b8
2 changed files with 335 additions and 330 deletions
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334
rslib/src/media/files.rs
View File

@ -1,14 +1,10 @@
// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
use crate::err::Result;
use crate::media::database::MediaEntry;
use crate::media::MediaManager;
use lazy_static::lazy_static;
use regex::Regex;
use sha1::Sha1;
use std::borrow::Cow;
use std::collections::HashMap;
use std::io::Read;
use std::path::Path;
use std::{fs, io, time};
@ -18,10 +14,10 @@ use unicode_normalization::{is_nfc_quick, IsNormalized, UnicodeNormalization};
/// with the rest of the path, the full path needs to be under ~240 chars
/// on some platforms, and some filesystems like eCryptFS will increase
/// the length of the filename.
static MAX_FILENAME_LENGTH: usize = 120;
pub(super) static MAX_FILENAME_LENGTH: usize = 120;
/// Media syncing does not support files over 100MiB.
static MEDIA_SYNC_FILESIZE_LIMIT: usize = 100 * 1024 * 1024;
pub(super) static MEDIA_SYNC_FILESIZE_LIMIT: usize = 100 * 1024 * 1024;
lazy_static! {
static ref WINDOWS_DEVICE_NAME: Regex = Regex::new(
@ -38,7 +34,7 @@ lazy_static! {
"#
)
.unwrap();
static ref NONSYNCABLE_FILENAME: Regex = Regex::new(
pub(super) static ref NONSYNCABLE_FILENAME: Regex = Regex::new(
r#"(?xi)
^
(:?
@ -199,7 +195,7 @@ fn existing_file_sha1(path: &Path) -> io::Result<Option<[u8; 20]>> {
}
/// Return the SHA1 of a file, failing if it doesn't exist.
fn sha1_of_file(path: &Path) -> io::Result<[u8; 20]> {
pub(super) fn sha1_of_file(path: &Path) -> io::Result<[u8; 20]> {
let mut file = fs::File::open(path)?;
let mut hasher = Sha1::new();
let mut buf = [0; 64 * 1024];
@ -226,14 +222,7 @@ pub(crate) fn sha1_of_data(data: &[u8]) -> [u8; 20] {
hasher.digest().bytes()
}
struct FilesystemEntry {
fname: String,
sha1: Option<[u8; 20]>,
mtime: i64,
is_new: bool,
}
fn mtime_as_i64<P: AsRef<Path>>(path: P) -> io::Result<i64> {
pub(super) fn mtime_as_i64<P: AsRef<Path>>(path: P) -> io::Result<i64> {
Ok(path
.as_ref()
.metadata()?
@ -243,226 +232,14 @@ fn mtime_as_i64<P: AsRef<Path>>(path: P) -> io::Result<i64> {
.as_secs() as i64)
}
impl MediaManager {
/// Add a file to the media folder.
///
/// If a file with differing contents already exists, a hash will be
/// appended to the name.
///
/// Also notes the file in the media database.
pub fn add_file<'a>(&mut self, desired_name: &'a str, data: &[u8]) -> Result<Cow<'a, str>> {
let pre_add_folder_mtime = mtime_as_i64(&self.media_folder)?;
// add file to folder
let data_hash = sha1_of_data(data);
let chosen_fname =
add_data_to_folder_uniquely(&self.media_folder, desired_name, data, data_hash)?;
let file_mtime = mtime_as_i64(self.media_folder.join(chosen_fname.as_ref()))?;
let post_add_folder_mtime = mtime_as_i64(&self.media_folder)?;
// add to the media DB
self.transact(|ctx| {
let existing_entry = ctx.get_entry(&chosen_fname)?;
let new_sha1 = Some(data_hash);
let entry_update_required = match existing_entry {
Some(existing) if existing.sha1 == new_sha1 => false,
_ => true,
};
if entry_update_required {
ctx.set_entry(&MediaEntry {
fname: chosen_fname.to_string(),
sha1: new_sha1,
mtime: file_mtime,
sync_required: true,
})?;
}
let mut meta = ctx.get_meta()?;
if meta.folder_mtime == pre_add_folder_mtime {
// if media db was in sync with folder prior to this add,
// we can keep it in sync
meta.folder_mtime = post_add_folder_mtime;
ctx.set_meta(&meta)?;
} else {
// otherwise, leave it alone so that other pending changes
// get picked up later
}
Ok(())
})?;
Ok(chosen_fname)
}
/// Note any added/changed/deleted files.
///
/// In the future, we could register files in the media DB as they
/// are added, meaning that for users who don't modify files externally, the
/// folder scan could be skipped.
pub fn register_changes(&mut self) -> Result<()> {
// folder mtime unchanged?
let dirmod = mtime_as_i64(&self.media_folder)?;
let mut meta = self.get_meta()?;
if dirmod == meta.folder_mtime {
return Ok(());
} else {
meta.folder_mtime = dirmod;
}
let mtimes = self.query(|ctx| ctx.all_mtimes())?;
let (changed, removed) = self.media_folder_changes(mtimes)?;
self.add_updated_entries(changed)?;
self.remove_deleted_files(removed)?;
self.set_meta(&meta)?;
Ok(())
}
/// Scan through the media folder, finding changes.
/// Returns (added/changed files, removed files).
///
/// Checks for invalid filenames and unicode normalization are deferred
/// until syncing time, as we can't trust the entries previous Anki versions
/// wrote are correct.
fn media_folder_changes(
&self,
mut mtimes: HashMap<String, i64>,
) -> Result<(Vec<FilesystemEntry>, Vec<String>)> {
let mut added_or_changed = vec![];
// loop through on-disk files
for dentry in self.media_folder.read_dir()? {
let dentry = dentry?;
// skip folders
if dentry.file_type()?.is_dir() {
continue;
}
// if the filename is not valid unicode, skip it
let fname_os = dentry.file_name();
let fname = match fname_os.to_str() {
Some(s) => s,
None => continue,
};
// ignore blacklisted files
if NONSYNCABLE_FILENAME.is_match(fname) {
continue;
}
// ignore large files
let metadata = dentry.metadata()?;
if metadata.len() > MEDIA_SYNC_FILESIZE_LIMIT as u64 {
continue;
}
// remove from mtimes for later deletion tracking
let previous_mtime = mtimes.remove(fname);
// skip files that have not been modified
let mtime = metadata
.modified()?
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs() as i64;
if let Some(previous_mtime) = previous_mtime {
if previous_mtime == mtime {
continue;
}
}
// add entry to the list
let sha1 = Some(sha1_of_file(&dentry.path())?);
added_or_changed.push(FilesystemEntry {
fname: fname.to_string(),
sha1,
mtime,
is_new: previous_mtime.is_none(),
});
}
// any remaining entries from the database have been deleted
let removed: Vec<_> = mtimes.into_iter().map(|(k, _)| k).collect();
Ok((added_or_changed, removed))
}
/// Add added/updated entries to the media DB.
///
/// Skip files where the mod time differed, but checksums are the same.
fn add_updated_entries(&mut self, entries: Vec<FilesystemEntry>) -> Result<()> {
for chunk in entries.chunks(1_024) {
self.transact(|ctx| {
for fentry in chunk {
let mut sync_required = true;
if !fentry.is_new {
if let Some(db_entry) = ctx.get_entry(&fentry.fname)? {
if db_entry.sha1 == fentry.sha1 {
// mtime bumped but file contents are the same,
// so we can preserve the current updated flag.
// we still need to update the mtime however.
sync_required = db_entry.sync_required
}
}
};
ctx.set_entry(&MediaEntry {
fname: fentry.fname.clone(),
sha1: fentry.sha1,
mtime: fentry.mtime,
sync_required,
})?;
}
Ok(())
})?;
}
Ok(())
}
/// Remove deleted files from the media DB.
fn remove_deleted_files(&mut self, removed: Vec<String>) -> Result<()> {
for chunk in removed.chunks(4_096) {
self.transact(|ctx| {
for fname in chunk {
ctx.set_entry(&MediaEntry {
fname: fname.clone(),
sha1: None,
mtime: 0,
sync_required: true,
})?;
}
Ok(())
})?;
}
Ok(())
}
}
#[cfg(test)]
mod test {
use crate::err::Result;
use crate::media::database::MediaEntry;
use crate::media::files::{
add_data_to_folder_uniquely, add_hash_suffix_to_file_stem, normalize_filename,
sha1_of_data, MAX_FILENAME_LENGTH,
};
use crate::media::MediaManager;
use std::borrow::Cow;
use std::path::Path;
use std::time::Duration;
use std::{fs, time};
use tempfile::tempdir;
use utime;
#[test]
fn test_normalize() {
@ -526,105 +303,4 @@ mod test {
]
);
}
// helper
fn change_mtime(p: &Path) {
let mtime = p.metadata().unwrap().modified().unwrap();
let new_mtime = mtime - Duration::from_secs(3);
let secs = new_mtime
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs();
utime::set_file_times(p, secs, secs).unwrap();
}
#[test]
fn test_change_tracking() -> Result<()> {
let dir = tempdir()?;
let media_dir = dir.path().join("media");
std::fs::create_dir(&media_dir)?;
let media_db = dir.path().join("media.db");
let mut mgr = MediaManager::new(&media_dir, media_db)?;
assert_eq!(mgr.count()?, 0);
// add a file and check it's picked up
let f1 = media_dir.join("file.jpg");
fs::write(&f1, "hello")?;
change_mtime(&media_dir);
mgr.register_changes()?;
assert_eq!(mgr.count()?, 1);
assert_eq!(mgr.changes_pending()?, 1);
let mut entry = mgr.get_entry("file.jpg")?.unwrap();
assert_eq!(
entry,
MediaEntry {
fname: "file.jpg".into(),
sha1: Some(sha1_of_data("hello".as_bytes())),
mtime: f1
.metadata()?
.modified()?
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs() as i64,
sync_required: true,
}
);
// mark it as unmodified
entry.sync_required = false;
mgr.set_entry(&entry)?;
assert_eq!(mgr.changes_pending()?, 0);
// modify it
fs::write(&f1, "hello1")?;
change_mtime(&f1);
change_mtime(&media_dir);
mgr.register_changes()?;
assert_eq!(mgr.count()?, 1);
assert_eq!(mgr.changes_pending()?, 1);
assert_eq!(
mgr.get_entry("file.jpg")?.unwrap(),
MediaEntry {
fname: "file.jpg".into(),
sha1: Some(sha1_of_data("hello1".as_bytes())),
mtime: f1
.metadata()?
.modified()?
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs() as i64,
sync_required: true,
}
);
// mark it as unmodified
entry.sync_required = false;
mgr.set_entry(&entry)?;
assert_eq!(mgr.changes_pending()?, 0);
// delete it
fs::remove_file(&f1)?;
change_mtime(&media_dir);
mgr.register_changes().unwrap();
assert_eq!(mgr.count()?, 0);
assert_eq!(mgr.changes_pending()?, 1);
assert_eq!(
mgr.get_entry("file.jpg")?.unwrap(),
MediaEntry {
fname: "file.jpg".into(),
sha1: None,
mtime: 0,
sync_required: true,
}
);
Ok(())
}
}

331
rslib/src/media/mod.rs
View File

@ -1,7 +1,17 @@
// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
use crate::err::Result;
use crate::media::database::open_or_create;
use crate::media::database::{open_or_create, MediaEntry};
use crate::media::files::{
add_data_to_folder_uniquely, mtime_as_i64, sha1_of_data, sha1_of_file,
MEDIA_SYNC_FILESIZE_LIMIT, NONSYNCABLE_FILENAME,
};
use rusqlite::Connection;
use std::borrow::Cow;
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::time;
pub mod database;
pub mod files;
@ -11,6 +21,13 @@ pub struct MediaManager {
media_folder: PathBuf,
}
struct FilesystemEntry {
fname: String,
sha1: Option<[u8; 20]>,
mtime: i64,
is_new: bool,
}
impl MediaManager {
pub fn new<P, P2>(media_folder: P, media_db: P2) -> Result<Self>
where
@ -23,4 +40,316 @@ impl MediaManager {
media_folder: media_folder.into(),
})
}
/// Add a file to the media folder.
///
/// If a file with differing contents already exists, a hash will be
/// appended to the name.
///
/// Also notes the file in the media database.
pub fn add_file<'a>(&mut self, desired_name: &'a str, data: &[u8]) -> Result<Cow<'a, str>> {
let pre_add_folder_mtime = mtime_as_i64(&self.media_folder)?;
// add file to folder
let data_hash = sha1_of_data(data);
let chosen_fname =
add_data_to_folder_uniquely(&self.media_folder, desired_name, data, data_hash)?;
let file_mtime = mtime_as_i64(self.media_folder.join(chosen_fname.as_ref()))?;
let post_add_folder_mtime = mtime_as_i64(&self.media_folder)?;
// add to the media DB
self.transact(|ctx| {
let existing_entry = ctx.get_entry(&chosen_fname)?;
let new_sha1 = Some(data_hash);
let entry_update_required = match existing_entry {
Some(existing) if existing.sha1 == new_sha1 => false,
_ => true,
};
if entry_update_required {
ctx.set_entry(&MediaEntry {
fname: chosen_fname.to_string(),
sha1: new_sha1,
mtime: file_mtime,
sync_required: true,
})?;
}
let mut meta = ctx.get_meta()?;
if meta.folder_mtime == pre_add_folder_mtime {
// if media db was in sync with folder prior to this add,
// we can keep it in sync
meta.folder_mtime = post_add_folder_mtime;
ctx.set_meta(&meta)?;
} else {
// otherwise, leave it alone so that other pending changes
// get picked up later
}
Ok(())
})?;
Ok(chosen_fname)
}
/// Note any added/changed/deleted files.
pub fn register_changes(&mut self) -> Result<()> {
// folder mtime unchanged?
let dirmod = mtime_as_i64(&self.media_folder)?;
let mut meta = self.get_meta()?;
if dirmod == meta.folder_mtime {
return Ok(());
} else {
meta.folder_mtime = dirmod;
}
let mtimes = self.query(|ctx| ctx.all_mtimes())?;
let (changed, removed) = self.media_folder_changes(mtimes)?;
self.add_updated_entries(changed)?;
self.remove_deleted_files(removed)?;
self.set_meta(&meta)?;
Ok(())
}
/// Scan through the media folder, finding changes.
/// Returns (added/changed files, removed files).
///
/// Checks for invalid filenames and unicode normalization are deferred
/// until syncing time, as we can't trust the entries previous Anki versions
/// wrote are correct.
fn media_folder_changes(
&self,
mut mtimes: HashMap<String, i64>,
) -> Result<(Vec<FilesystemEntry>, Vec<String>)> {
let mut added_or_changed = vec![];
// loop through on-disk files
for dentry in self.media_folder.read_dir()? {
let dentry = dentry?;
// skip folders
if dentry.file_type()?.is_dir() {
continue;
}
// if the filename is not valid unicode, skip it
let fname_os = dentry.file_name();
let fname = match fname_os.to_str() {
Some(s) => s,
None => continue,
};
// ignore blacklisted files
if NONSYNCABLE_FILENAME.is_match(fname) {
continue;
}
// ignore large files
let metadata = dentry.metadata()?;
if metadata.len() > MEDIA_SYNC_FILESIZE_LIMIT as u64 {
continue;
}
// remove from mtimes for later deletion tracking
let previous_mtime = mtimes.remove(fname);
// skip files that have not been modified
let mtime = metadata
.modified()?
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs() as i64;
if let Some(previous_mtime) = previous_mtime {
if previous_mtime == mtime {
continue;
}
}
// add entry to the list
let sha1 = Some(sha1_of_file(&dentry.path())?);
added_or_changed.push(FilesystemEntry {
fname: fname.to_string(),
sha1,
mtime,
is_new: previous_mtime.is_none(),
});
}
// any remaining entries from the database have been deleted
let removed: Vec<_> = mtimes.into_iter().map(|(k, _)| k).collect();
Ok((added_or_changed, removed))
}
/// Add added/updated entries to the media DB.
///
/// Skip files where the mod time differed, but checksums are the same.
fn add_updated_entries(&mut self, entries: Vec<FilesystemEntry>) -> Result<()> {
for chunk in entries.chunks(1_024) {
self.transact(|ctx| {
for fentry in chunk {
let mut sync_required = true;
if !fentry.is_new {
if let Some(db_entry) = ctx.get_entry(&fentry.fname)? {
if db_entry.sha1 == fentry.sha1 {
// mtime bumped but file contents are the same,
// so we can preserve the current updated flag.
// we still need to update the mtime however.
sync_required = db_entry.sync_required
}
}
};
ctx.set_entry(&MediaEntry {
fname: fentry.fname.clone(),
sha1: fentry.sha1,
mtime: fentry.mtime,
sync_required,
})?;
}
Ok(())
})?;
}
Ok(())
}
/// Remove deleted files from the media DB.
fn remove_deleted_files(&mut self, removed: Vec<String>) -> Result<()> {
for chunk in removed.chunks(4_096) {
self.transact(|ctx| {
for fname in chunk {
ctx.set_entry(&MediaEntry {
fname: fname.clone(),
sha1: None,
mtime: 0,
sync_required: true,
})?;
}
Ok(())
})?;
}
Ok(())
}
}
#[cfg(test)]
mod test {
use crate::err::Result;
use crate::media::database::MediaEntry;
use crate::media::files::sha1_of_data;
use crate::media::MediaManager;
use std::path::Path;
use std::time::Duration;
use std::{fs, time};
use tempfile::tempdir;
// helper
fn change_mtime(p: &Path) {
let mtime = p.metadata().unwrap().modified().unwrap();
let new_mtime = mtime - Duration::from_secs(3);
let secs = new_mtime
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs();
utime::set_file_times(p, secs, secs).unwrap();
}
#[test]
fn test_change_tracking() -> Result<()> {
let dir = tempdir()?;
let media_dir = dir.path().join("media");
std::fs::create_dir(&media_dir)?;
let media_db = dir.path().join("media.db");
let mut mgr = MediaManager::new(&media_dir, media_db)?;
assert_eq!(mgr.count()?, 0);
// add a file and check it's picked up
let f1 = media_dir.join("file.jpg");
fs::write(&f1, "hello")?;
change_mtime(&media_dir);
mgr.register_changes()?;
assert_eq!(mgr.count()?, 1);
assert_eq!(mgr.changes_pending()?, 1);
let mut entry = mgr.get_entry("file.jpg")?.unwrap();
assert_eq!(
entry,
MediaEntry {
fname: "file.jpg".into(),
sha1: Some(sha1_of_data("hello".as_bytes())),
mtime: f1
.metadata()?
.modified()?
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs() as i64,
sync_required: true,
}
);
// mark it as unmodified
entry.sync_required = false;
mgr.set_entry(&entry)?;
assert_eq!(mgr.changes_pending()?, 0);
// modify it
fs::write(&f1, "hello1")?;
change_mtime(&f1);
change_mtime(&media_dir);
mgr.register_changes()?;
assert_eq!(mgr.count()?, 1);
assert_eq!(mgr.changes_pending()?, 1);
assert_eq!(
mgr.get_entry("file.jpg")?.unwrap(),
MediaEntry {
fname: "file.jpg".into(),
sha1: Some(sha1_of_data("hello1".as_bytes())),
mtime: f1
.metadata()?
.modified()?
.duration_since(time::UNIX_EPOCH)
.unwrap()
.as_secs() as i64,
sync_required: true,
}
);
// mark it as unmodified
entry.sync_required = false;
mgr.set_entry(&entry)?;
assert_eq!(mgr.changes_pending()?, 0);
// delete it
fs::remove_file(&f1)?;
change_mtime(&media_dir);
mgr.register_changes().unwrap();
assert_eq!(mgr.count()?, 0);
assert_eq!(mgr.changes_pending()?, 1);
assert_eq!(
mgr.get_entry("file.jpg")?.unwrap(),
MediaEntry {
fname: "file.jpg".into(),
sha1: None,
mtime: 0,
sync_required: true,
}
);
Ok(())
}
}