use std::collections::BTreeMap;
use std::fs;
use std::fs::File;
use std::path::{Path, PathBuf};
use anyhow::{anyhow, Context, Result};
use serde::{Deserialize, Serialize};
use super::file::{calc_xxh128_with_callback, FileMeta};
use super::progress::ProgressTracker;
use crate::constants::META_VERSION;
use crate::utils::{basename, should_skip_dir, should_skip_file};
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DirSnapshot {
pub dir_name: String,
pub dirs: Vec<DirSnapshot>,
pub files: Vec<FileMeta>,
#[serde(skip_serializing_if = "Option::is_none")]
pub v: Option<String>,
}
impl DirSnapshot {
pub fn build_root(path: &Path) -> Result<Self> {
let total_files = count_files(path)?;
let tracker = ProgressTracker::new(total_files, "构建中...");
let mut node = Self::build_node(path, &tracker)?;
node.v = Some(META_VERSION.to_string());
tracker.finish("构建完成");
Ok(node)
}
pub fn from_reader<R: std::io::Read>(reader: R) -> Result<Self> {
Ok(serde_json::from_reader(reader)?)
}
fn build_node(path: &Path, tracker: &ProgressTracker) -> Result<Self> {
let dir_name = path
.file_name()
.map(basename)
.unwrap_or_else(|| path.to_string_lossy().to_string());
let mut dirs = Vec::new();
let mut files = Vec::new();
let mut entries = fs::read_dir(path)
.with_context(|| format!("无法遍历目录: {}", path.display()))?
.collect::<Result<Vec<_>, _>>()
.with_context(|| format!("读取目录失败: {}", path.display()))?;
entries.sort_unstable_by_key(|e| e.file_name());
for entry in entries {
let file_name = entry.file_name();
let name = file_name.to_string_lossy().to_string();
let full_path = entry.path();
let file_type = entry
.file_type()
.with_context(|| format!("无法读取类型: {}", full_path.display()))?;
if file_type.is_symlink() {
continue;
}
if file_type.is_dir() {
if should_skip_dir(&name) {
continue;
}
let sub_meta = full_path.join("meta.json");
if sub_meta.exists() {
dirs.push(Self::verify_and_load(&full_path, tracker)?);
} else {
dirs.push(Self::build_node(&full_path, tracker)?);
}
continue;
}
if should_skip_file(&name) {
continue;
}
let file_size = entry.metadata()
.map(|m| m.len())
.unwrap_or(0);
tracker.start_file(file_size, &name);
let on_bytes = tracker.bytes_callback();
let on_iop = tracker.iop_callback();
let meta = FileMeta::from_path_with_callback(&full_path, on_bytes, on_iop)?;
files.push(meta);
tracker.finish_file();
}
Ok(Self {
dir_name,
dirs,
files,
v: None,
})
}
pub fn collect_file_map(&self, root: &Path) -> BTreeMap<PathBuf, FileMeta> {
let mut map = BTreeMap::new();
self.collect_into(root.to_path_buf(), &mut map);
map
}
fn collect_into(&self, current: PathBuf, map: &mut BTreeMap<PathBuf, FileMeta>) {
for file in &self.files {
map.insert(current.join(&file.basename), file.clone());
}
for dir in &self.dirs {
let next = current.join(&dir.dir_name);
dir.collect_into(next, map);
}
}
fn verify_and_load(path: &Path, tracker: &ProgressTracker) -> Result<Self> {
let meta_path = path.join("meta.json");
let meta_file = File::open(&meta_path)
.with_context(|| format!("无法读取: {}", meta_path.display()))?;
let snapshot: Self = serde_json::from_reader(meta_file)
.with_context(|| format!("无法解析: {}", meta_path.display()))?;
let mut stored = snapshot.collect_file_map(path);
let mut current = BTreeMap::new();
walk_dir_with_progress(path, &mut current, tracker)?;
for (file_path, hash) in current {
if let Some(meta) = stored.remove(&file_path) {
if hash != meta.xxh128 {
return Err(anyhow!(
"校验失败: {}\n 期望: {}\n 当前: {}",
file_path.display(),
meta.xxh128,
hash
));
}
} else {
return Err(anyhow!("文件新增: {}", file_path.display()));
}
}
if let Some((missing_path, _)) = stored.into_iter().next() {
return Err(anyhow!("文件缺失: {}", missing_path.display()));
}
let msg = format!("✓ 校验通过: {}", path.display());
if let Some(multi) = tracker.multi() {
multi.suspend(|| {
eprintln!("{msg}");
});
} else {
eprintln!("{msg}");
}
Ok(snapshot)
}
}
pub fn scan_dir_xxh128(path: &Path) -> Result<BTreeMap<PathBuf, String>> {
let total_files = count_files(path)?;
let tracker = ProgressTracker::new(total_files, "扫描中...");
let mut map = BTreeMap::new();
walk_dir_with_progress(path, &mut map, &tracker)?;
tracker.finish("扫描完成");
Ok(map)
}
fn count_files(path: &Path) -> Result<u64> {
let mut count = 0u64;
count_files_recursive(path, &mut count)?;
Ok(count)
}
fn count_files_recursive(path: &Path, count: &mut u64) -> Result<()> {
let entries = fs::read_dir(path)
.with_context(|| format!("无法遍历目录: {}", path.display()))?
.collect::<Result<Vec<_>, _>>()
.with_context(|| format!("读取目录失败: {}", path.display()))?;
for entry in entries {
let file_name = entry.file_name();
let name = file_name.to_string_lossy().to_string();
let full_path = entry.path();
let file_type = entry
.file_type()
.with_context(|| format!("无法读取类型: {}", full_path.display()))?;
if file_type.is_symlink() {
continue;
}
if file_type.is_dir() {
if should_skip_dir(&name) {
continue;
}
count_files_recursive(&full_path, count)?;
} else {
if !should_skip_file(&name) {
*count += 1;
}
}
}
Ok(())
}
fn walk_dir_with_progress(
path: &Path,
map: &mut BTreeMap<PathBuf, String>,
tracker: &ProgressTracker,
) -> Result<()> {
let mut entries = fs::read_dir(path)
.with_context(|| format!("无法遍历目录: {}", path.display()))?
.collect::<Result<Vec<_>, _>>()
.with_context(|| format!("读取目录失败: {}", path.display()))?;
entries.sort_unstable_by_key(|e| e.file_name());
for entry in entries {
let file_name = entry.file_name();
let name = file_name.to_string_lossy().to_string();
let full_path = entry.path();
let file_type = entry
.file_type()
.with_context(|| format!("无法读取类型: {}", full_path.display()))?;
if file_type.is_symlink() {
continue;
}
if file_type.is_dir() {
if should_skip_dir(&name) {
continue;
}
walk_dir_with_progress(&full_path, map, tracker)?;
continue;
}
if should_skip_file(&name) {
continue;
}
let file_size = entry.metadata()
.map(|m| m.len())
.unwrap_or(0);
tracker.start_file(file_size, &name);
let on_bytes = tracker.bytes_callback();
let on_iop = tracker.iop_callback();
let hash = calc_xxh128_with_callback(&full_path, on_bytes, on_iop)?;
map.insert(full_path, hash);
tracker.finish_file();
}
Ok(())
}