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https://github.com/servo/servo.git
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232 lines
8.4 KiB
Rust
232 lines
8.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
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use net_traits::storage_task::{StorageTask, StorageTaskMsg, StorageType};
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use std::borrow::ToOwned;
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use std::collections::BTreeMap;
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use std::collections::HashMap;
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use std::sync::mpsc::channel;
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use url::Url;
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use util::str::DOMString;
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use util::task::spawn_named;
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const QUOTA_SIZE_LIMIT: usize = 5 * 1024 * 1024;
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pub trait StorageTaskFactory {
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fn new() -> Self;
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}
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impl StorageTaskFactory for StorageTask {
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/// Create a StorageTask
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fn new() -> StorageTask {
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let (chan, port) = ipc::channel().unwrap();
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spawn_named("StorageManager".to_owned(), move || {
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StorageManager::new(port).start();
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});
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chan
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}
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}
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struct StorageManager {
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port: IpcReceiver<StorageTaskMsg>,
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session_data: HashMap<String, (usize, BTreeMap<DOMString, DOMString>)>,
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local_data: HashMap<String, (usize, BTreeMap<DOMString, DOMString>)>,
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}
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impl StorageManager {
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fn new(port: IpcReceiver<StorageTaskMsg>) -> StorageManager {
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StorageManager {
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port: port,
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session_data: HashMap::new(),
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local_data: HashMap::new(),
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}
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}
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}
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impl StorageManager {
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fn start(&mut self) {
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loop {
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match self.port.recv().unwrap() {
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StorageTaskMsg::Length(sender, url, storage_type) => {
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self.length(sender, url, storage_type)
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}
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StorageTaskMsg::Key(sender, url, storage_type, index) => {
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self.key(sender, url, storage_type, index)
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}
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StorageTaskMsg::Keys(sender, url, storage_type) => {
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self.keys(sender, url, storage_type)
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}
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StorageTaskMsg::SetItem(sender, url, storage_type, name, value) => {
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self.set_item(sender, url, storage_type, name, value)
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}
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StorageTaskMsg::GetItem(sender, url, storage_type, name) => {
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self.request_item(sender, url, storage_type, name)
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}
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StorageTaskMsg::RemoveItem(sender, url, storage_type, name) => {
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self.remove_item(sender, url, storage_type, name)
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}
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StorageTaskMsg::Clear(sender, url, storage_type) => {
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self.clear(sender, url, storage_type)
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}
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StorageTaskMsg::Exit => {
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break
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}
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}
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}
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}
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fn select_data(&self, storage_type: StorageType)
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-> &HashMap<String, (usize, BTreeMap<DOMString, DOMString>)> {
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match storage_type {
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StorageType::Session => &self.session_data,
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StorageType::Local => &self.local_data
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}
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}
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fn select_data_mut(&mut self, storage_type: StorageType)
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-> &mut HashMap<String, (usize, BTreeMap<DOMString, DOMString>)> {
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match storage_type {
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StorageType::Session => &mut self.session_data,
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StorageType::Local => &mut self.local_data
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}
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}
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fn length(&self, sender: IpcSender<usize>, url: Url, storage_type: StorageType) {
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let origin = self.origin_as_string(url);
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let data = self.select_data(storage_type);
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sender.send(data.get(&origin).map_or(0, |&(_, ref entry)| entry.len())).unwrap();
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}
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fn key(&self,
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sender: IpcSender<Option<DOMString>>,
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url: Url,
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storage_type: StorageType,
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index: u32) {
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let origin = self.origin_as_string(url);
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let data = self.select_data(storage_type);
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let key = data.get(&origin)
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.and_then(|&(_, ref entry)| entry.keys().nth(index as usize))
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.cloned();
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sender.send(key).unwrap();
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}
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fn keys(&self,
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sender: IpcSender<Vec<DOMString>>,
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url: Url,
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storage_type: StorageType) {
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let origin = self.origin_as_string(url);
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let data = self.select_data(storage_type);
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let keys = data.get(&origin)
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.map_or(vec![], |&(_, ref entry)| entry.keys().cloned().collect());
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sender.send(keys).unwrap();
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}
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/// Sends Ok(changed, Some(old_value)) in case there was a previous
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/// value with the same key name but with different value name
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/// otherwise sends Err(()) to indicate that the operation would result in
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/// exceeding the quota limit
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fn set_item(&mut self,
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sender: IpcSender<Result<(bool, Option<DOMString>), ()>>,
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url: Url,
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storage_type: StorageType,
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name: DOMString,
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value: DOMString) {
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let origin = self.origin_as_string(url);
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let current_total_size = {
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let local_data = self.select_data(StorageType::Local);
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let session_data = self.select_data(StorageType::Session);
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let local_data_size = local_data.get(&origin).map_or(0, |&(total, _)| total);
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let session_data_size = session_data.get(&origin).map_or(0, |&(total, _)| total);
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local_data_size + session_data_size
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};
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let data = self.select_data_mut(storage_type);
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if !data.contains_key(&origin) {
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data.insert(origin.clone(), (0, BTreeMap::new()));
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}
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let message = data.get_mut(&origin).map(|&mut (ref mut total, ref mut entry)| {
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let mut new_total_size = current_total_size + value.as_bytes().len();
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if let Some(old_value) = entry.get(&name) {
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new_total_size -= old_value.as_bytes().len();
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} else {
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new_total_size += name.as_bytes().len();
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}
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if new_total_size > QUOTA_SIZE_LIMIT {
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return Err(());
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}
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let message = entry.insert(name.clone(), value.clone()).map_or(
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Ok((true, None)),
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|old| if old == value {
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Ok((false, None))
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} else {
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Ok((true, Some(old)))
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});
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*total = new_total_size;
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message
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}).unwrap();
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sender.send(message).unwrap();
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}
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fn request_item(&self,
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sender: IpcSender<Option<DOMString>>,
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url: Url,
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storage_type: StorageType,
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name: DOMString) {
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let origin = self.origin_as_string(url);
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let data = self.select_data(storage_type);
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sender.send(data.get(&origin)
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.and_then(|&(_, ref entry)| entry.get(&name))
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.map(|value| value.to_string())).unwrap();
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}
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/// Sends Some(old_value) in case there was a previous value with the key name, otherwise sends None
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fn remove_item(&mut self,
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sender: IpcSender<Option<DOMString>>,
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url: Url,
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storage_type: StorageType,
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name: DOMString) {
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let origin = self.origin_as_string(url);
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let data = self.select_data_mut(storage_type);
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let old_value = data.get_mut(&origin).and_then(|&mut (ref mut total, ref mut entry)| {
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entry.remove(&name).and_then(|old| {
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*total -= name.as_bytes().len() + old.as_bytes().len();
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Some(old)
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})
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});
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sender.send(old_value).unwrap();
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}
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fn clear(&mut self, sender: IpcSender<bool>, url: Url, storage_type: StorageType) {
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let origin = self.origin_as_string(url);
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let data = self.select_data_mut(storage_type);
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sender.send(data.get_mut(&origin)
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.map_or(false, |&mut (ref mut total, ref mut entry)| {
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if !entry.is_empty() {
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entry.clear();
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*total = 0;
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true
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} else {
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false
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}})).unwrap();
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}
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fn origin_as_string(&self, url: Url) -> String {
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let mut origin = "".to_owned();
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origin.push_str(&url.scheme);
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origin.push_str("://");
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url.domain().map(|domain| origin.push_str(&domain));
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url.port().map(|port| {
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origin.push_str(":");
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origin.push_str(&port.to_string());
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});
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origin.push_str("/");
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origin
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}
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}
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